Telescopic platform and projection apparatus

Abstract

The present disclosure belongs to the technical field of projection. Disclosed are a telescopic platform and a projection apparatus. The telescopic platform comprises: a support base, on which a driving device is provided; and a moving platform, which is movably arranged on the support base and connected to the driving device, and is configured to carry the projection main unit of the projection apparatus, to move the projection main unit to an extended position when the projection main unit is turned on, and to move the projection main unit to a retracted position when the projection main unit is turned off, wherein in the driving device, an output end of a driving electric motor is connected to an active member, the active member is connected to a transmission member, and the transmission member is connected to the moving platform, such that the moving platform is driven by the transmission member to switch between the extended position and the retracted position; and an elastic buffer mechanism is provided at the connection between the active member and the transmission member, so as to realize the elastic connection between the active member and the transmission member by means of the elastic buffer mechanism. The elastic buffer mechanism has a buffering effect to reduce, when a finger of a user is trapped, the squeezing force on the finger within a short period of time, so that the user can pull out his / her finger in a timely manner before being injured, thereby improving the usage experience of the telescopic platform.

Description

Telescopic platform and projection equipment

[0001] The present disclosure claims the priority of Chinese patent application No. 202311540042.X, filed on November 17, 2023, and entitled “Telescopic platform for ultra-short-throw projection equipment and ultra-short-throw projection equipment”, as well as the priority of Chinese patent application No. 202323186230.5, filed on November 23, 2023, and entitled “Telescopic platform for projection equipment and projection equipment”, as well as the priority of Chinese patent application No. 202410030582.1, filed on January 8, 2024, and entitled “Telescopic platform and projection equipment”, and the priority of Chinese patent application No. 202410031845.0, filed on January 8, 2024, and entitled “Ultra-short-throw projection equipment”, the entire contents of which are incorporated by reference into the present disclosure. Technical Field

[0002] The present disclosure relates to the field of projection technology, and in particular to a telescopic platform and projection equipment. Background Art

[0003] Existing projection equipment, such as laser TVs, usually includes a projection host and a projection screen. When in use, the projection host projects images onto the projection screen for users to watch. The positional relationship between the projection host and the projection screen is adjusted to meet the needs of projection images of different sizes. In addition, a certain distance needs to be maintained between the projection host and the projection screen during projection to ensure that the image on the projection screen is clear and beautiful.

[0004] If the projection host is placed on a TV cabinet, if the depth of the TV cabinet is not enough, the projection distance of the projection host cannot be met. At this time, a telescopic platform will be configured on the TV cabinet. The telescopic platform usually has a base and a movable platform. The movable platform can be extended and retracted relative to the base under the drive of a driving mechanism. The projection host is placed on the movable platform, and the movable platform drives the projection host to move relative to the base in a direction away from the projection screen to adjust the projection distance of the projection host and ensure that the projection host projects a clear and beautiful image on the projection screen.

[0005] Public content

[0006] In one aspect, the present disclosure provides a telescopic platform, the telescopic platform comprising: a support base, the support base being provided with a driving device;

[0007] a movable platform, movably disposed on the support base and connected to the driving device, for carrying a projection host of the projection device, and driving the projection host to move to an extended position when the projection host is turned on to adjust the distance between the projection host and the projection screen, and driving the projection host to move to a retracted position when the projection host is turned off;

[0008] The driving device includes a driving motor, an active member, and a transmission member. The output end of the driving motor is connected to the active member, the active member is connected to the transmission member, and the transmission member is connected to the mobile platform, so as to drive the mobile platform to switch between the extended position and the retracted position through the transmission member.

[0009] An elastic buffer mechanism is provided at the connection portion between the active member and the transmission member, so as to realize elastic connection between the active member and the transmission member through the elastic buffer mechanism.

[0010] The disclosed embodiment provides an elastic buffer mechanism between the active member and the transmission member, so that when a user's finger is pinched, the elastic buffer mechanism first further deforms to slow down the speed at which the distance between the mobile platform and the support base decreases, thereby extending the time required for the mobile platform to apply greater pressure to the user's finger. The elastic buffer mechanism plays a buffering role and reduces the squeezing force applied to the user's finger in a short period of time when the user is pinched, allowing the user to pull out the finger in time before being pinched, thereby improving the user experience of the telescopic platform.

[0011] Another aspect of the present disclosure provides a projection device, which includes a projection host, a projection screen, and a telescopic platform according to any one of claims 1 to 23, wherein the projection host is located on a movable platform of the telescopic platform, the projection port of the projection host faces the projection screen, and the movable platform drives the projection host to move toward or away from the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic structural diagram of an exemplary telescopic platform according to an embodiment of the present disclosure;

[0013] FIG2 is a top view of an exemplary telescopic platform according to an embodiment of the present disclosure;

[0014] FIG3 is a side view of an exemplary telescopic platform according to an embodiment of the present disclosure;

[0015] FIG4 is a schematic structural diagram of an exemplary telescopic platform without the moving platform according to an embodiment of the present disclosure;

[0016] FIG5 is a top view of an exemplary telescopic platform without the moving platform according to an embodiment of the present disclosure;

[0017] FIG6 is a schematic structural diagram of an exemplary driving device according to an embodiment of the present disclosure;

[0018] FIG7 is a side view of an exemplary driving device according to an embodiment of the present disclosure;

[0019] FIG8 is a top view of an exemplary driving device according to an embodiment of the present disclosure;

[0020] FIG9 is a side view of an exemplary adjusting bolt according to an embodiment of the present disclosure;

[0021] FIG10 is a schematic structural diagram of an exemplary adjusting bolt according to an embodiment of the present disclosure;

[0022] FIG11 is a side view of an exemplary adjusting bolt assembled with the mobile station body according to an embodiment of the present disclosure;

[0023] FIG12 is a schematic structural diagram of an exemplary lead screw nut according to an embodiment of the present disclosure;

[0024] FIG13 is a schematic structural diagram of an exemplary ultra-short-throw projection device in a retracted position according to an embodiment of the present disclosure;

[0025] FIG14 is a schematic structural diagram of an exemplary ultra-short-throw projection device in an extended position according to an embodiment of the present disclosure;

[0026] FIG15 is a schematic structural diagram of another exemplary mobile station in an extended position according to an embodiment of the present disclosure;

[0027] FIG16 is a top view of another exemplary mobile station in an extended position according to an embodiment of the present disclosure;

[0028] FIG17 is a schematic diagram of the internal structure of another exemplary mobile station in an extended position according to an embodiment of the present disclosure;

[0029] FIG18 is a top view of the internal structure of another exemplary mobile station in an extended position according to an embodiment of the present disclosure;

[0030] FIG19 is an assembly diagram of another exemplary mobile station and a projection host in an extended position according to an embodiment of the present disclosure;

[0031] FIG20 is a schematic structural diagram of another exemplary mobile station in a retracted position according to an embodiment of the present disclosure;

[0032] FIG21 is a top view of another exemplary mobile station in a retracted position according to an embodiment of the present disclosure;

[0033] FIG22 is a schematic diagram of the internal structure of another exemplary mobile station in a retracted position according to an embodiment of the present disclosure;

[0034] FIG23 is a top view of the internal structure of another exemplary mobile station in a retracted position according to an embodiment of the present disclosure;

[0035] FIG24 is an assembly diagram of another exemplary mobile station and a projection host in a retracted position according to an embodiment of the present disclosure;

[0036] FIG25 is a schematic structural diagram of another exemplary telescopic platform according to an embodiment of the present disclosure;

[0037] FIG26 is a schematic structural diagram of the translation stage shown in FIG25 ;

[0038] FIG27 is a schematic structural diagram of the support base shown in FIG25;

[0039] FIG28 is a schematic structural diagram of the sliding member group shown in FIG27;

[0040] FIG29 is a cross-sectional view of yet another exemplary telescopic platform according to an embodiment of the present disclosure;

[0041] FIG30 is an enlarged view of point A shown in FIG29;

[0042] FIG31 is a cross-sectional view of yet another exemplary telescopic platform according to an embodiment of the present disclosure;

[0043] FIG32 is an enlarged view of point B shown in FIG31;

[0044] FIG33 is a cross-sectional view of yet another exemplary telescopic platform according to an embodiment of the present disclosure;

[0045] FIG34 is an enlarged view of point C shown in FIG33;

[0046] FIG35 is a schematic diagram of the structure of some exemplary projection hosts according to an embodiment of the present disclosure;

[0047] FIG36 is a schematic diagram of the structure of some other exemplary telescopic platforms according to an embodiment of the present disclosure;

[0048] FIG37 is a schematic diagram of some exemplary connections between a telescopic platform and a projection host according to an embodiment of the present disclosure;

[0049] FIG38 is a schematic diagram of the connection between other exemplary telescopic platforms and a projection host according to an embodiment of the present disclosure;

[0050] FIG39 is a schematic structural diagram of some further exemplary telescopic platforms according to an embodiment of the present disclosure;

[0051] FIG40 is a schematic diagram of the structure of some further exemplary telescopic platforms according to an embodiment of the present disclosure;

[0052] FIG41 is a schematic diagram of other exemplary connections between telescopic platforms and projection hosts according to an embodiment of the present disclosure;

[0053] FIG42 is a schematic diagram showing the connection between some exemplary telescopic platforms and a projection host according to an embodiment of the present disclosure.

[0054] The accompanying drawings respectively represent: 100, telescopic platform; 1, support base; 10, installation space; 101, first installation area; 102, second installation area; 1021, partition; 103, third opening; 11, wire outlet; 111, first support wall; 112, second support wall; 113, sliding member group; 1131, first sliding member; 1132, second sliding member; 1133, first guide groove; 1141, first groove surface; 1142, second groove surface; 1143, first surface; 115, drive motor; 116, screw; 2, moving platform; 20, reserved opening; 21, moving platform body; 211, adjustment hole; 22, adjustment 124, 1251, 1252, 1253, 1254, 1255, 1256, 1257, 1258, 1259, 1260, 1270, 1271, 1272, 1273, 1274, 1275, 1276, 1277, 1278, 1280, 1281, 1282, 1283, 1284, 1285, 1286, 1287, 1288, 1289, 1290, 1301, 1311, 1320, 1331, 1341, 1352, 1360, 1371, 1380, 1390, 1403, 1411, 1420, 1431, 1441, 1451, 1460, 1470, 1480, 1490, 1501, 1521, 1531, 1541, 1551, 1560, 1570, 1580 Second guide protrusion; 126, first limiting protrusion; 127, second limiting protrusion; 2001, mounting groove; 20011, first opening; 20012, second opening; 2002, lower shell; 2003, base; 3, driving device; 31, driving motor; 32, active part; 321, screw rod; 322, screw rod nut; 323, nut body; 324, connecting plate; 33, transmission part; 331, transmission sheet; 332, connecting part; 333, first A plate body; 334, a second plate body; 34, an elastic buffer mechanism; 341, a connecting bolt; 342, a connecting nut; 343, an elastic member; 4, a controller; 5, a sliding assembly; 51, a slide rail; 52, a slider; 61, a detector; 62, a sensing member; 7, a protective member; 71, a moving end; 72, a fixed end; 73, a tank chain; 731, a chain unit; 8, a supporting member; 9, a dustproof member; 200, a projection host; 201, a cable; 300, a projection screen. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present disclosure are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present disclosure. The drawings of the present disclosure are only used to illustrate relative position relationships and do not represent true proportions.

[0056] At present, the existing telescopic platform includes a base and a movable plate for carrying the projection host. The movable plate can be extended and retracted relative to the base under the drive of a driving mechanism. After the projection host is placed on the movable plate, the laser projection equipment can be reached to the specified position by adjusting the telescopic length of the movable plate.

[0057] However, the existing telescopic platform is prone to problems such as jamming and freezing due to assembly errors of the driving mechanism. In addition, when the driving mechanism drives the movable plate to move from the extended position to the retracted position, if the user's fingers or other body parts are in the gap between the movable plate and the base, the movable plate will exert a large force on the user's fingers and other body parts under the driving force of the driving mechanism, which may easily pinch the user's fingers and other body parts, affecting the user's experience of using the telescopic platform to adjust the relative position between the projection host and the projection screen.

[0058] In response to the above technical problems, with reference to Figures 1 to 14, an embodiment of the present disclosure provides a telescopic platform 100. For example, the telescopic platform 100 can be applied to an ultra-short-throw projection device, and the relative position between the projection host 200 and the projection screen 300 of the ultra-short-throw projection device can be adjusted by using the telescopic platform 100.

[0059] 1 to 4 , the telescopic platform 100 comprises a support base 1, a movable platform 2, and a drive device 3. The drive device 3 is disposed on the support base 1; the movable platform 2 is movably mounted on the support base 1 and connected to the drive device 3. The movable platform 2 is configured to support the projection unit 200 of the ultra-short-throw projection device and to move the projection unit 200 to an extended position when the projection unit 200 is turned on to adjust the distance between the projection unit 200 and the projection screen 300. The movable platform 2 also moves the projection unit 200 to a retracted position when the projection unit 200 is turned off.

[0060] Among them, the driving device 3 includes a driving motor 31, an active part 32 and a transmission part 33. The output end of the driving motor 31 is connected to the active part 32, the active part 32 is connected to the transmission part 33, and the transmission part 33 is connected to the mobile platform 2 to drive the mobile platform 2 to switch between the extended position and the retracted position through the transmission part 33.

[0061] The telescopic platform 100 further includes a controller 4 , which is electrically connected to the driving device 3 . For example, the controller 4 is electrically connected to the driving motor 31 of the driving device 3 , and is used to control the start and stop of the driving device 3 .

[0062] Taking the application of the telescopic platform 100 to an ultra-short-throw projection device as an example, the ultra-short-throw projection device can be a laser TV, and of course it can also be an ultra-short-throw projector. The ultra-short-throw projection device usually includes a projection host 200 and a projection screen 300 that matches it. The projection screen 300 is used to carry the image projected by the projection host 200. The focal length of the projected image of the ultra-short-throw projection device is shorter, so that the image can be projected on the projection screen 300 even when the distance between the projection host 200 and the projection screen 300 is closer. However, due to different home environments and areas, the TV cabinet used to place the projection host 200 is close to the projection screen 300. When the area of ​​the TV cabinet is small, the distance between the projection host 200 and the projection screen 300 is too close to complete the projection operation. Therefore, the ultra-short-throw projection equipment is installed on a telescopic platform 100 that can move laterally. The telescopic platform 100 drives the projection host 200 to move closer to or away from the projection screen 300, so that the projection host 200 has an appropriate distance from the projection screen 300 when working. When the projection host 200 is out of use, the telescopic platform 100 drives the projection host 200 back to the TV cabinet to reduce the floor space occupied by the projection host 200 and the telescopic platform 100.

[0063] It should be understood that the projection screen 300 is not limited to the exemplary screen structure, and may also be a projection surface such as a wall.

[0064] The retracted position can be when the mobile platform 2 moves toward the projection screen 300 until the inner wall of the mobile platform 2 is in contact with the support base 1, so that the projection host 200 and the telescopic platform 100 are both located on the TV cabinet. The extended position can be when the mobile platform 2 moves away from the projection screen 300, so that the projection host 200 mounted on the mobile platform 2 moves with the mobile platform 2, until an appropriate projection distance is maintained between the projection host 200 and the projection screen 300, allowing the projection host 200 to project a clear image on the projection screen 300. At this point, the position of the mobile platform 2 is the extended position. It can be seen that the mobile platform 2 can move from the retracted position toward the projection screen 300 to reach the extended position, and the mobile platform 2 can also move from the extended position toward the projection screen 300 to reach the retracted position.

[0065] By arranging a driving device 3 on the support base 1, the driving device 3 drives the movable platform 2 to switchably move between the extended position and the retracted position relative to the support base 1. At the same time, the movable platform 2 is used for the projection equipment, for example, the projection host 200 carrying the ultra-short-throw projection equipment, so that the projection host 200 is driven to move by the movement of the movable platform 2, thereby achieving the purpose of adjusting the relative position between the projection host 200 and the projection screen 300. After the adjustment is in place, the driving device is controlled to stop running by the controller 4, so that the projection host 200 and the projection screen 300 maintain a suitable relative position, thereby ensuring the display effect of the projection screen 300.

[0066] The above-mentioned driving motor 31 is arranged on the support base 1, and the active member 32 is connected to the output end of the driving motor 31. The output end of the driving motor 31 can drive the active member 32 to move in the direction close to or away from the projection screen 300; the active member 32 and the transmission member 33 can be connected to each other using bolts, and a through hole can be provided on the transmission member 33, and the bolt passes through the through hole to be connected to the active member 32. A nut is provided at the end of the bolt away from the active member 32, so that the transmission member 33 cannot fall off from the end of the bolt where the nut is provided. The transmission member 33 is connected to the active member 32, and the transmission member 33 can approach or move away from the active member 32 on the bolt.

[0067] In some examples, when the active member 32 moves toward the extended position, the active member 32 abuts against the transmission member 33, so that the active member 32 drives the transmission member 33 to move and the mobile platform 2 moves to the extended position. When the active member 32 moves toward the retracted position, the nut of the bolt on the active member 32 abuts against the transmission member 33, so that the movement of the active member 32 drives the transmission member 33 to move, thereby moving the mobile platform 2 to the retracted position.

[0068] The driving motor 31, the active member 32, and the transmission member 33 cooperate to drive the movable platform 2. However, in actual production, due to processing errors, assembly errors, and other factors, errors may accumulate during the assembly of the active member 32, the transmission member 33, and the movable platform 2. As a result, after assembly, when the active member 32 moves, the transmission member 33 may become misaligned with the active member 32 due to the assembly errors, causing the movable platform 2 to become stuck or even stuck. Furthermore, since the active member 32 drives the transmission member 33 to move, the active member 32 and the transmission member 33 transmit driving force through direct or indirect contact. When the movable platform 2 moves toward the retracted position and a user's finger is located between the movable platform 2 and the support base 1, the driving force of the active member 32 is directly transmitted to the movable platform 2 through the transmission member 33. The movable platform 2 exerts a large squeezing force on the user's finger in a short period of time. Without sufficient time to react, the user's finger may be pinched between the movable platform 2 and the support base 1 and cannot be withdrawn, resulting in a pinch injury.

[0069] Based on this, the telescopic platform 100 provided in the embodiment of the present disclosure is provided with an elastic buffer mechanism 34 at the connection portion between the active member 32 and the transmission member 33 so as to realize an elastic connection between the active member 32 and the transmission member 33 through the elastic buffer mechanism 34 .

[0070] That is to say, by providing an elastic buffer mechanism 34 at the connection position between the active member 32 and the transmission member 33 of the driving device 3, the connection between the active member 32 and the transmission member 33 is formed into a soft connection. Such a setting, on the one hand, provides a larger margin for the installation and matching of the active member 32 and the transmission member 33, thereby avoiding the problem that the telescopic platform 100 is stuck or jammed due to the accumulation of assembly tolerances of the structures such as the active member 32 and the transmission member 33 of the driving device 3; on the other hand, at least when the driving motor 31 drives the active member 32 to move and moves the movable platform 2 toward the retracted position, the active member 32 transmits power to the transmission member 33, and the elastic buffer mechanism 34 can be elastically deformed, so that when the user's finger is clamped in the gap between the movable platform 2 and the support base 1 When the elastic buffer mechanism 34 is in the state of being moved, the elastic buffer mechanism 34 will be further deformed due to the obstruction of foreign matter, thereby slowing down the speed at which the distance between the mobile platform 2 and the support base 1 decreases. Since the elastic buffer mechanism 34 is further compressed or stretched, the speed at which the distance between the mobile platform 2 and the support base 1 along the moving direction of the mobile platform 2 decreases is slowed down, and the speed at which the squeezing force exerted by the mobile platform 2 on the user's finger in a short period of time increases is slowed down. The elastic buffer mechanism 34 plays a buffering role, and the user can pull out the finger in time to avoid the user's finger being injured by a large squeezing force in a short period of time, thereby improving the safety of the use of the telescopic platform 100, and further improving the user's experience of using the telescopic platform 100 to adjust the relative position between the projection host 200 and the projection screen 300.

[0071] In some examples, the support base 1 can be a rectangular shell or one side of the support base 1 can be recessed to form a rectangular cavity, so that the drive device 3 can be installed inside the support base 1. For example, the movable platform 2 can be a rectangular panel, and a baffle is provided on at least one edge of the panel along the first direction. When the movable platform 2 is in the retracted position, the baffle is arranged relative to the support base 1 along the first direction. The baffle can be made to fit the side of the support base 1, and of course, a small gap can also be provided between the baffle and the support base 1. Alternatively, the movable platform 2 is a rectangular box structure, and a notch is provided on one side of the box structure along the first direction for avoiding the support base 1. The box structure has an inlet and outlet on the side facing the support base 1. The support base 1 is installed inside the box structure through the inlet and outlet. When the movable platform 2 moves, it avoids the support base 1 through the notch, so that the movable platform 2 can move between the extended position and the retracted position along the first direction.

[0072] When the above-mentioned support base 1 is placed on a plane, the first direction a can be a direction parallel to the plane. When the support base 1 is a rectangular structure, the first direction a can be consistent with the length direction of the support base 1. Of course, the first direction can also be consistent with the width direction of the support base 1. The movable platform 2 can be set on a side surface of the support base 1 away from the plane, so that the movable platform 2 can be used to place the projection host 200; the two ends of the support base 1 along the first direction can be the front end and the rear end, and the moving direction of the movable platform 2 when moving from the retracted position to the extended position is to move along the rear end toward the front end, the front end is the end away from the projection screen 300, and the rear end is the end close to the projection At one end of the screen 300, a baffle is set at the front end of the projection screen 300; the retracted position can be that the movable platform 2 moves toward the projection screen 300 until the baffle or the box structure of the movable platform 2 is in contact with the inner wall of the support base 1 along the first direction; the extended position can be that the movable platform 2 moves along the first direction away from the projection screen 300, so that the projection host 200 installed on the movable platform 2 moves with the movable platform 2 until a suitable projection distance is maintained between the projection host 200 and the projection screen 300, so that the projection host 200 can project a clear image on the projection screen 300. At this time, the position of the movable platform 2 is the extended position.

[0073] As shown in Figure 5, the above-mentioned active part 32 can be a screw rod 321 and a screw nut 322 that are connected to each other in a cooperative manner. The screw rod 321 is arranged along the first direction and is connected to the drive motor 31. The screw nut 322 is connected to the screw rod 321 in a cooperative manner. The transmission part 33 is connected to the screw nut 322, so that the drive motor 31 drives the screw rod 321 to rotate and drives the screw nut 322 to move along the first direction.

[0074] The transmission member 33 can be a rectangular plate, or a circular plate. The transmission member 33 can be provided with a through hole, and the active member 32 can be passed through the through hole, so that the transmission member 33 is sleeved on the active member 32. Alternatively, the transmission member 33 can be provided with two through holes, and the active member 32 can be provided with two pillars, the pillars extending along the first direction, the two pillars passing through the two through holes, and the pillars and the through holes are movably connected. As shown in FIG4 , the elastic buffer mechanism 34 can be two springs, which are sleeved on the pillars, and the two ends of the springs are respectively connected to the pillars and the transmission member 33, so that the transmission member 33 is connected through the elastic buffer mechanism 34, so that when the screw rod 321 rotates, because the transmission member 33 is connected to the sliding assembly 5 and the pillars pass through the through holes on the transmission member 33, the pillars and the through holes restrict the screw nut 322 from rotating together with the screw rod 321, so that the screw nut 322 and the screw rod 321 produce relative motion.

[0075] When the screw nut 322 moves along the screw 321, the elastic buffer mechanism 34 first deforms to generate an elastic force, and then the elastic buffer mechanism 34 uses the elastic force to push the transmission member 33 to move. Alternatively, when the screw nut 322 moves along the screw 321 to drive the movable platform 2 toward the extended position, the screw nut 322 and the transmission member 33 come into contact, causing the screw nut 322 to apply a driving force to the transmission member 33. When the screw nut 322 moves along the screw 321 to drive the movable platform 2 toward the retracted position, the elastic buffer mechanism 34 deforms to generate an elastic force, and then the elastic buffer mechanism 34 uses the elastic force to push the transmission member 33 to move. That is, at least during the process of the movable platform 2 moving to the retracted position, the elastic buffer mechanism 34 deforms to transmit the driving force on the active member 32 to the transmission member 33.

[0076] Of course, the elastic buffer mechanism 34 can also be an elastic rubber ring, which is arranged between the screw nut 322 and the transmission member 33. The two sides of the rubber ring are connected to the active member 32 and the transmission member 33. When the active member 32 moves along the first direction, the active member 32 first applies pressure to the rubber ring. After the rubber ring is deformed, it applies elastic force to the transmission member 33, so that the transmission member 33 moves together with the rubber ring.

[0077] The above-mentioned transmission member 33 can be arranged on the side of the active member 32 away from the driving motor 31, and the pillar on the active member 32 extends toward the front end along the first direction, and the pillar passes through the through hole so that the end of the pillar is located on the side of the transmission member 33 away from the active member 32, and one end of the elastic buffer mechanism 34 is connected to the end of the pillar on the side of the transmission member 33 away from the active member 32, and the other end of the elastic buffer mechanism 34 is connected to the surface of the transmission member 33, so that when the movable platform 2 moves from the extended position to the retracted position, the active member 32 moves along the first direction toward the direction close to the driving motor 31, and the end of the pillar of the active member 32 applies pressure to the elastic buffer mechanism 34, so that the elastic buffer mechanism 34 is compressed and applies elastic force to the transmission member 33, so that the transmission member 33 moves along the first direction with the active member 32, and the transmission member 33 drives the movable platform 2 to move along the first direction toward the direction close to the projection screen 300, so that the movable platform 2 moves to the retracted position. Of course, when the movable platform 2 moves toward the retracted position, the active member 32 moves to stretch the elastic buffer mechanism 34 and apply elastic force to the transmission member 33 to move the transmission member 33 in a direction away from the front end.

[0078] When the active member 32 and the transmission member 33 are stationary, the elastic buffer mechanism 34 can be placed in a compressed state, causing the elastic buffer mechanism 34 to apply elastic forces in opposite directions to the ends of the pillars and the transmission member 33, thereby causing the transmission member 33 to fit closely with the active member 32. When the active member 32 moves toward the extended position, the active member 32 directly applies a driving force to the transmission member 33. When the active member 32 moves toward the retracted position, the active member 32 moves, further compressing the elastic buffer mechanism 34 and generating an elastic force. The elastic force of the elastic buffer mechanism 34 drives the transmission member 33 to move. At least when the active member 32 drives the movable platform 2 toward the retracted position, the elastic buffer mechanism 34 deforms and transmits the driving force of the active member 32 to the transmission member 33.

[0079] Of course, when the active member 32 and the transmission member 33 are stationary, the elastic buffer mechanism 34 is in an unstretched or uncompressed state between the end of the support and the transmission member 33. When the active member 32 moves, the elastic buffer mechanism 34 is stretched or compressed to transmit driving force to the transmission member 33.

[0080] A slide rail along the first direction can be set between the above-mentioned movable platform 2 and the support base 1, and a slider is set in the slide rail. The slider is slidably connected to the slide rail, and the movable platform 2 is connected to the slider. The transmission member 33 can be connected to the slider so that when the transmission member 33 moves along the first direction, the movable platform 2 is driven to slide through the slider. Of course, the transmission member 33 can also be directly connected to the movable platform 2 so that the transmission member 33 directly applies driving force to the movable platform 2 when it moves along the first direction.

[0081] During the above process, when the user's finger or foreign object is in the gap between the mobile platform 2 and the support base 1, the elastic buffer mechanism 34 is further compressed or stretched, so that the speed at which the distance between the mobile platform 2 and the support base 1 along the first direction is reduced is slowed down, and the speed at which the squeezing force exerted by the mobile platform 2 on the user's finger or foreign object in a short period of time increases is slowed down. The elastic buffer mechanism 34 plays a buffering role, preventing the user's finger or foreign object from being injured by a large squeezing force in a short period of time.

[0082] There is usually a gap between the above-mentioned mobile platform 2 and the support base 1. If the mobile platform 2 is directly connected to the active component 32, the distance moved by the active component 32 is the distance moved by the mobile platform 2. When the mobile platform 2 moves from the extended position to the retracted position, when the user's finger is inserted into the gap between the mobile platform 2 and the support base 1, the driving force of the active component 32 is transmitted to the mobile platform 2 in real time. When the user's finger touches the mobile platform 2, the continuous movement of the active component 32 causes the distance between the mobile platform 2 and the support base 1 to decrease rapidly, so that the driving force of the active component 32 on the mobile platform 2 directly squeezes the user's finger. The user's finger will be subjected to a large squeezing force in a short period of time, and the user will be pinched by the mobile platform 2 and the support base 1 before he can react in time. The embodiment of the present disclosure monitors the output current of the drive motor 31 by providing an elastic buffer mechanism 34 and a controller. When the user's finger is pinched, the further deformation of the elastic buffer mechanism 34 first slows down the speed at which the gap between the mobile platform 2 and the support base 1 decreases, so that the elastic buffer mechanism 34 can play a buffering role. In addition, the controller monitors the output current of the drive motor 31 and can promptly detect and stop the operation of the drive motor 31 when the user's finger is pinched and the output current of the drive motor 31 increases, so that the mobile platform 2 stops moving and the user can pull the finger out of the gap between the mobile platform 2 and the support base 1.

[0083] During use, the telescopic platform 100 is installed on a plane, and the projection host 200 is installed on the movable platform 2. When the movable platform 2 is turned off, it is in the retracted position. When the position of the projection host 200 needs to be adjusted, the telescopic platform 100 is started, and the controller controls the driving motor 31 to apply driving force to the active member 32, and the active member 32 applies driving force to the transmission member 33, so that the transmission member 33 drives the movable platform 2 to move in a first direction, and the active member 32 moves in a direction away from the driving motor 31, so that the movable platform 2 moves from the retracted position to the extended position. After the movable platform 2 moves to the extended position where the projection image of the projection host 200 can be clearly projected, the driving motor 31 stops working, the movable platform 2 remains stable in the extended position, and the projection host 200 performs projection work.

[0084] When the projection host 200 finishes working, the drive motor 31 drives the active member 32 to move toward the direction close to the drive motor 31. The elastic buffer mechanism 34 is compressed in this process and applies an elastic force to the transmission member 33. The transmission member 33 drives the movable platform 2 toward the retracted position under the action of the elastic force. When the movable platform 2 moves toward the retracted position, when the user's finger is inserted into the gap between the movable platform 2 and the support base 1, the movable platform 2 first contacts the user's finger during the movement. Since the user's finger has a certain hardness, the resistance encountered by the movable platform 2 when moving toward the retracted position increases. At this time, the elastic buffer mechanism 34 is further compressed, so that the speed of reducing the distance between the movable platform 2 and the support base 1 is slowed down, and the speed of gradually increasing the pressure on the user's finger in a short period of time is reduced, thereby extending the time for the movable platform 2 to exert a large squeezing force on the user's finger, so that the user has enough reaction time to pull the finger out of the gap between the movable platform 2 and the support base 1. The elastic buffer mechanism 34 plays a buffering role, slowing down the speed at which the distance between the mobile platform 2 and the support base 1 decreases when the user's finger is pinched. The user has enough reaction time to pull the finger out of the gap between the mobile platform 2 and the support base 1 bracket, thus avoiding injury to the user's finger.

[0085] In the embodiment of the present disclosure, an elastic buffer mechanism 34 is provided between the active member 32 and the transmission member 33. When a user's finger is pinched, the elastic buffer mechanism 34 is further deformed to slow down the speed at which the distance between the movable platform 2 and the support base 1 decreases, thereby extending the time required for the movable platform 2 to apply greater pressure to the user's finger. The elastic buffer mechanism 34 then plays a buffering role and reduces the squeezing force on the user's finger in a short period of time when the user's finger is pinched, allowing the user to remove the finger in time before being pinched, thereby improving the user experience of the telescopic platform 100.

[0086] 4 to 8 , in some embodiments, mounting holes are correspondingly provided on the active member 32 and the transmission member 33, the active member 32 is connected to the transmission member via a fastener passing through the mounting hole, the elastic buffer mechanism 34 is sleeved on the fastener, and is elastically supported between one of the active member 32 and the transmission member 33 and the fastener, or is elastically supported between the active member 32 and the transmission member 33.

[0087] Exemplarily, the fastener can be a columnar structure or a bolt. After the fastener passes through the mounting holes on the active member 32 and the transmission member 33, one end of the fastener is connected to the active member 32, and the other end is located on the side of the transmission member 33 away from the active member 32 and is provided with a limit member, so that the transmission member 33 cannot escape from the end of the fastener away from the active member 32, that is, the transmission member 33 can approach or move along the fastener. The elastic buffer mechanism 34 is sleeved on the fastener, and the elastic buffer mechanism 34 is located between the active member 32 and the transmission member 33. One end of the elastic buffer mechanism 34 is connected to the active member 32, and the other end is connected to the transmission member 33. When the active member 32 moves toward the direction close to the transmission member 33, the elastic buffer mechanism 34 is compressed and pushes the transmission member 33 to move. When the active member 32 moves in the direction away from the transmission member 33, the elastic buffer mechanism 34 is stretched and pulls the transmission member 33 to move.

[0088] Of course, as shown in Figures 6 to 8, the fastener may include a connecting bolt 341 and a connecting nut 342, and the elastic buffer mechanism 34 includes an elastic member 343. One end of the connecting bolt 341 passes through the mounting holes of the connecting plate 324 and the transmission member 33, and is threadedly connected to the connecting nut 342. The elastic member 343 is sleeved on the connecting bolt 341 and is elastically supported between the connecting nut 342 and the transmission member 33.

[0089] The above-mentioned active part 32 and transmission part 33 are both provided with through holes as mounting holes, so that the screw of the connecting bolt 341 passes through the through holes on the connecting plate 324 and the transmission part 33, and the connecting bolt 341 is fixedly connected to the active part 32. A connecting nut 342 is installed at the end of the screw of the connecting bolt 341, so that the transmission part 33 is located between the active part 32 and the connecting nut 342, so that the connecting nut 342 limits the elastic part 343 from detaching from the screw. An elastic part 343 is sleeved on the screw of the connecting bolt 341. The elastic part 343 can be a spring, or of course an elastic rubber ring. One end of the elastic part 343 on the screw is connected to the connecting nut 342, and the other end is connected to a side of the transmission part 33 close to the nut.

[0090] By providing corresponding mounting holes on the active member 32 and the transmission member 33, the active member 32 is connected to the transmission member 33 through a fastener passing through the mounting hole, and the elastic buffer mechanism 34 is sleeved on the fastener and elastically supported between one of the active member 32 and the transmission member 33 and the fastener, or elastically supported between the active member 32 and the transmission member 33, so that the fastener can limit the direction of the elastic force of the elastic buffer mechanism 34 to the transmission member 33 and the active member 32. The fastener can also improve the stability between the active member 32 and the transmission member 33, and improve the buffering effect of the elastic buffer mechanism 34.

[0091] 4 , 5 , 6 , 7 and 8 , in some embodiments, the active member 32 includes a screw rod 321 and a screw nut 322 , the screw rod 321 is connected to the output end of the drive motor 31 , the screw nut 322 is sleeved on the screw rod 321 and is threadedly connected to the screw rod 321 , and the drive motor 31 drives the screw nut 322 to perform reciprocating linear motion on the screw rod 321 ; mounting holes are correspondingly provided on the screw nut 322 and the transmission member 33 , the screw nut 322 is connected to the transmission member 33 through a fastener passed through the mounting hole, the elastic buffer mechanism 34 is sleeved on the fastener, and is elastically supported between one of the screw nut 322 and the transmission member 33 and the fastener, or elastically supported between the screw nut 322 and the transmission member 33 .

[0092] Exemplarily, the screw rod 321 can be a straight rod extending along the first direction, a thread is provided on the surface of the screw rod 321, and a screw hole is provided on the screw nut 322, so that the screw rod 321 is threadedly connected to the screw hole on the screw nut 322, so that the screw nut 322 can rotate relative to the screw rod 321 and can move along the first direction on the screw rod 321 through the thread. When the driving motor 31 drives the screw rod 321 to rotate, the screw nut 322 rotates relative to the screw rod 321, so that the rotation of the screw rod 321 can drive the screw nut 322 to move along the first direction on the screw rod 321.

[0093] The above-mentioned transmission member 33 can be provided with a through hole as a mounting hole, and the screw nut 322 can be provided with a connecting plate 324, the connecting plate 324 is provided perpendicular to the screw hole of the screw nut 322, and a through hole is provided on the connecting plate 324 as a mounting hole; the screw rod 321 passes through the through hole on the transmission member 33, so that the transmission member 33 is sleeved on the screw rod 321, and two through holes can be provided on the transmission member 33 as mounting holes, and two mounting holes are provided on the screw nut 322. The two fasteners are respectively passed through the mounting holes on the screw nut 322 and the transmission member 33, the fasteners extend along the first direction, the fasteners are fixedly connected to the screw nut 322, the fasteners are movably connected to the mounting hole of the transmission member 33, and the fasteners are away from the screw rod 321. A limit piece is provided at one end of the rod nut 322; the elastic buffer mechanism 34 can be two springs, which are sleeved on the fastener, and the two ends of the spring are respectively connected to the limit piece of the fastener and the transmission member 33, so that the transmission member 33 is connected to the fastener through the elastic buffer mechanism 34. When the screw rod 321 rotates to push the screw nut 322 to move, when the screw nut 322 moves in the direction close to the transmission member 33, the screw nut 322 can abut against the transmission member 33 and push the transmission member 33 to move. When the screw nut 322 moves in the direction away from the transmission member 33, the screw nut 322 first compresses the spring of the elastic buffer mechanism 34, and the spring applies elastic force to the transmission member 33 to push the transmission member 33 to move.

[0094] When the screw rod 321 rotates, since the transmission member 33 is connected to the movable platform 2 and the fastener passes through the mounting hole of the transmission member 33, the fastener and the mounting hole of the transmission member 33 restrict the screw nut 322 from rotating together with the screw rod 321, so that the screw nut 322 moves along the screw rod 321.

[0095] Of course, the elastic buffer mechanism 34 can also be sleeved on the fastener. The elastic buffer mechanism 34 can be set between the screw nut 322 and the transmission member 33, so that the elastic buffer mechanism 34 is deformed when the screw nut 322 moves along the screw 321, and the elastic buffer mechanism 34 pushes the transmission member 33 to move through elastic force.

[0096] By setting the active part 32 to include a screw rod 321 and a screw nut 322, the screw nut 322 is connected to the transmission part 33 through the elastic buffer mechanism 34, so that the driving motor 31 drives the screw rod 321 to rotate, and the screw nut 322 can move along the screw rod 321, and the driving force output by the driving motor 31 is transmitted to the transmission part 33 through the elastic buffer mechanism 34. The cooperation between the screw rod 321 and the screw nut 322 is stable, and the number of rotation steps of the driving motor 31 corresponds to the moving distance of the screw nut 322 along the first direction, which is convenient for controlling the moving distance of the screw nut 322 and improving the accuracy of the movement of the moving platform 2.

[0097] 12 , in some embodiments, the screw nut 322 includes a nut body 323 and a connecting plate 324 , wherein the connecting plate 324 is connected to the end of the nut body 323 ;

[0098] The nut body 323 is sleeved on the screw rod 321 and is threadedly connected to the screw rod 321 . The transmission member 33 is sleeved on the nut body 323 and is connected to the connecting plate 324 through the elastic buffer mechanism 34 .

[0099] Exemplarily, the nut body 323 can be a cylindrical structure, the nut body 323 is arranged along the first direction, and the nut body 323 is provided with a screw hole along the first direction, so that the screw rod 321 can be threadedly connected to the nut body 323 through the screw hole, and the connecting plate 324 can be set at the end of the nut body 323 close to the drive motor 31, and the connecting plate 324 can extend along the radial direction of the screw rod 321. The connecting plate 324 can be an integrated structure with the nut body 323. Of course, the connecting plate 324 can also be installed on the nut body 323 using bolts; a through hole can be opened on the transmission member 33, and the screw rod 321 and the nut body 323 are arranged through the through hole. The through hole on the transmission member 33 can have a gap between it and the nut body, thereby facilitating the passage of the nut body 323, and when there is a deviation in the processing of the nut body 323, the transmission member 33 can also be sleeved on the nut body 323 through the through hole.

[0100] The above-mentioned transmission member 33 can be provided with a through hole, and a pillar can be provided on the connecting plate 324 so that the pillar passes through the through hole on the transmission member 33. The elastic buffer mechanism 34 can connect the ends of the pillar with the transmission member 33 respectively, so that the transmission member 33 and the connecting plate 324 are connected through the elastic buffer mechanism 34; the connecting plates 324 can be respectively provided on both sides of the nut body 323 along the radial direction of the screw rod 321, and the connecting plates 324 on both sides of the nut body 323 are connected to the transmission member 33 through the elastic buffer mechanism 34.

[0101] By setting the screw nut 322 to include a nut body 323 and a connecting plate 324, and the transmission member 33 is connected to the connecting plate 324 through an elastic buffer mechanism 34, the screw 321 rotates to drive the nut body 323 to move, and the connecting plate 324 transmits the driving force to the transmission member 33 through the elastic buffer mechanism 34, so that the elastic buffer mechanism 34 can play a buffering role between the connecting plate 324 and the transmission member 33. When the user's finger is pinched, the elastic buffer mechanism 34 can buffer the transmission of force between the transmission member 33 and the connecting plate 324, thereby reducing the squeezing force on the user's finger in a short period of time and protecting the user's finger.

[0102] 4 , 5 , 6 , 7 and 8 , in some embodiments, the fastener includes a connecting bolt 341 and a connecting nut 342 , one end of the connecting bolt 341 passes through the screw nut 322 and the transmission member 33 , and is threadedly connected to the connecting nut 342 , and the elastic buffer mechanism 34 includes an elastic member 343 , which is sleeved on the connecting bolt 341 and elastically supported between the connecting nut 342 and the transmission member 33 .

[0103] The above-mentioned active part 32 and transmission part 33 are both provided with through holes as mounting holes, so that the screw of the connecting bolt 341 passes through the through holes on the connecting plate 324 and the transmission part 33, and the connecting bolt 341 is fixedly connected to the active part 32. A connecting nut 342 is installed at the end of the screw of the connecting bolt 341, so that the transmission part 33 is located between the active part 32 and the connecting nut 342, so that the connecting nut 342 limits the elastic part 343 from detaching from the screw. An elastic part 343 is sleeved on the screw of the connecting bolt 341. The elastic part 343 can be a spring, or of course an elastic rubber ring. One end of the elastic part 343 on the screw is connected to the connecting nut 342, and the other end is connected to a side of the transmission part 33 close to the nut.

[0104] The transmission member 33 can be set on the side of the screw nut 322 away from the projection screen 300, so that the elastic member 343 can play a buffering role when the screw nut 322 moves close to the projection screen 300, and when the screw nut 322 moves away from the projection screen 300, the screw nut 322 can directly push the transmission member 33 to move.

[0105] When the screw nut 322 moves toward the transmission member 33, the screw nut 322 can abut against the transmission member 33 and push the transmission member 33. When the screw nut 322 moves toward and away from the transmission member 33, the screw nut 322 compresses the elastic member 343 and drives the transmission member 33 to move, so that when the screw nut 322 moves close to the projection screen 300, the elastic member 343 can play a buffering role. When the screw nut 322 moves away from the projection screen 300, the screw nut 322 can directly push the transmission member 33 to move and ensure that the driving force output by the drive motor 31 can accurately move the movable platform 2 to its position, thereby avoiding the compression and elongation of the elastic member 343 interfering with the accuracy of the moving position of the movable platform 2.

[0106] 4 , 5 , 6 , 7 and 8 , in some embodiments, the number of the elastic buffer mechanisms 34 is at least two, and the at least two elastic buffer mechanisms 34 are spaced apart around the central axis of the screw nut 322 .

[0107] Exemplarily, the number of elastic buffer mechanisms 34 can be two, and the two elastic buffer mechanisms 34 are respectively arranged on both sides of the central axis of the nut body 323 of the screw nut 322 along the radial direction of the screw 321, so that the two elastic buffer mechanisms 34 can balance the elastic forces applied to the screw nut 322 and the transmission member 33. Of course, the number of elastic buffer mechanisms 34 can also be four, and the four elastic buffer mechanisms 34 are arranged at equal intervals around the central axis of the nut body 323.

[0108] By setting the number of elastic buffer mechanisms 34 to at least two, at least two elastic buffer mechanisms 34 are spaced apart around the central axis of the screw nut 322, so that multiple elastic buffer mechanisms 34 can jointly play the role of transmitting driving force and buffering, and multiple elastic buffer mechanisms 34 are spaced apart around the central axis of the nut body 323, so that when the elastic buffer mechanism 34 is compressed or stretched, the elastic force applied to the transmission member 33 and the screw nut 322 is evenly distributed, ensuring that the transmission member 33 moves with the screw nut 322 to ensure stability.

[0109] In some embodiments, a mounting hole is opened on the transmission member 33, and the transmission member 33 is mounted on the screw nut 322 through the mounting hole, such as on the nut body 323, and there is a clearance fit between the mounting hole and the screw nut 322, such as the screw nut 322.

[0110] For example, a circular through hole can be opened on the transmission part 33 as a mounting hole. When the nut body 323 of the screw nut 322 is a cylinder, the diameter of the mounting hole is larger than the diameter of the nut body 323 of the screw nut 322. The nut body 323 is inserted into the mounting hole so that there is a gap between the mounting hole and the side of the nut body 323 of the screw nut 322.

[0111] The mounting holes of the transmission member 33 are clearance-matched with the lead screw nut 322, so that when the transmission member 33 is not positioned accurately due to the accumulation of deviations during the installation of the various components of the telescopic platform 100, the nut body 323 can still pass through the mounting holes due to the clearance fit between the mounting holes and the lead screw nut 322, so that the transmission member 33 is sleeved on the nut body 323, thereby preventing the transmission member 33 from being unable to be installed with the nut body 323 due to the accumulation of position deviations during the installation of the various components of the telescopic platform 100, thereby improving the adaptability of the transmission member 33.

[0112] 4 , 5 , 6 , 7 and 8 , in some embodiments, the transmission member 33 includes a transmission plate 331 and a connecting member 332 , the transmission plate 331 is connected to the active member 32 , and the connecting member 332 is connected to the moving platform 2 .

[0113] Exemplarily, a sliding assembly 5 can be provided on the support seat 1. The sliding assembly 5 can be a sliding matching structure of a slider and a slide groove. The slide groove is provided on the support seat 1, and the slider is connected to the movable platform 2. Of course, the sliding assembly 5 can also be a sliding matching structure of a slide rod and a slider. The slide rod is connected to the support seat 1, the slider is slidably connected to the slide rod, and the movable platform 2 is connected to the slider.

[0114] The transmission piece 331 can be used to connect with the active part 32, and the connection part between the transmission piece 331 and the active part 32 is provided with an elastic buffer mechanism 34; the transmission piece 331 can be a rectangular or circular sheet, and the transmission piece 331 is provided with mounting holes and holes corresponding to the connecting bolts 341, so that the transmission piece 331 is connected to the active part 32 through the elastic buffer mechanism 34; the connecting piece 332 can be a rectangular plate or an L-shaped plate, one end of the connecting piece 332 is connected to the sliding component 5, and the other end is connected to one side edge of the transmission piece 331. Of course, one end of the connecting piece 332 can also be connected to one side edge of the transmission piece 331, and the other end is connected to the moving platform 2; the transmission piece 331 and the connecting piece 332 can be connected by bolts, and of course the transmission piece 331 and the connecting piece 332 can also be an integrated structure.

[0115] As shown in Figures 7 and 8, the above-mentioned connecting member 332 may include a first plate body 333 and a second plate body 334. The first plate body 333 is arranged along the first direction, and the two ends of the first plate body 333 along the first direction are respectively connected to the sliding component 5. The second plate body 334 is arranged in the middle of the first plate body 333, and the second plate body 334 extends toward the transmission plate 331 to be connected to one side edge of the transmission plate 331. Of course, both ends of the first plate body 333 can also be connected to the side of the movable platform 2 facing the support seat 1.

[0116] By setting up a transmission part including a transmission plate 331 and a connecting part 332, the transmission plate 331 is connected to the active part 32, and an elastic buffer mechanism 34 is provided at the connection part between the transmission plate 331 and the active part 32. The connecting part 332 is connected to the mobile platform 2, and the connecting part 332 facilitates the connection between the transmission plate 331 and the mobile platform 2.

[0117] Referring to Figures 1, 4, and 5, in some embodiments, two sliding assemblies 5 are provided on the support base 1, and the two sliding assemblies 5 are respectively provided on both sides of the driving device 3. The transmission member is connected to one of the sliding assemblies 5, and the mobile platform 2 is fixedly connected to the two sliding assemblies 5. The connecting member 332 transmits power to the mobile platform 2 through the sliding assembly 5 fixedly connected to the connecting member 332.

[0118] Exemplarily, the two sliding components 5 are connected to the mobile platform 2, so that when the mobile platform 2 is subjected to a driving force, it can move relative to the support base 1 through the two sliding components 5. The sliding component 5 can be connected to the support base 1. The sliding component 5 has a sliding portion that can slide along a first direction. The mobile platform 2 is connected to the sliding portion so that the mobile platform 2 can slide relative to the support base 1 along the first direction. The distance between the driving device 3 and the two sliding components 5 can be equal. Of course, the distance between the driving device 3 and one sliding component 5 can also be smaller than the distance between the driving device 3 and the other sliding component 5.

[0119] As shown in Figure 5, the sliding assembly 5 may include a slide rail 51 and two sliders 52. The slide rail 51 is arranged along the first direction a, and the two sliders 52 are spaced apart on the slide rail 51 along the first direction a. There is a set distance between the two sliders 52, and the transmission member 33 is connected to both sliders 52. Of course, a straight rod along the first direction a can also be arranged on the support base 1, and a sleeve or a slider can be arranged on the straight rod, and the sleeve or slider can be connected to the movable platform 2. The sleeve or slider slides relative to the straight rod along the first direction a, so that the movable platform 2 can slide relative to the support base 1 along the first direction a.

[0120] When the above-mentioned moving platform 2 is pushed by an external force, a sliding component 5 applies a driving force to the transmission member 33. Since the sliding component 5 is located on the side of the transmission member 33, the position where the sliding component 5 applies force to the transmission member 33 is the edge of the transmission member 33, so that the driving force on the transmission member 33 is offset. The pressures applied to the elastic buffer mechanism 34 or the screw nut 322 on both sides of the transmission member 33 in the radial direction of the screw rod 321 are different, so that the driving force applied to the screw nut 322 is offset relative to the axis of the screw rod 321 after the driving force is equivalent. Compared with the driving force applied to the axis of the screw rod 321 after the driving force is equivalent, In the online situation, after the driving force is equivalent and the offset is achieved, a larger driving force is required to push the screw nut 322 to move along the screw rod 321, and because the transmission member 33 has a certain deformation ability, the transmission member 33 will also tilt under the action of the offset driving force, which aggravates the offset of the screw nut 322 after the driving force is equivalent. As a result, after the driving motor 31 is powered off, a large force is applied to the moving platform 2 to make it possible to move the screw nut 322, thereby achieving a self-locking effect after the driving motor 31 is powered off.

[0121] By arranging two sliding assemblies 5 on the support base 1, the two sliding assemblies 5 are respectively arranged on both sides of the driving device 3, and the moving platform 2 is fixedly connected to the two sliding assemblies 5, so that the two sliding assemblies 5 can improve the stability of the moving platform 2 when moving, and the transmission member 33 is connected to one of the sliding assemblies, and the transmission member 33 transmits power to the moving platform 2 through the sliding assembly 5 fixedly connected to the transmission member 33, so that when the moving platform 2 is pushed, the transmission member 33 is subjected to a biased force, and the screw nut 322 of the active member 32 is also subjected to a biased force. Compared with the case where the screw nut 322 is subjected to a force equivalent to the axial center line of the screw rod 321, the screw nut 322 is subjected to a biased force, so that the screw nut 322 requires a greater force to be pushed. Therefore, the connection between the transmission member 33 and one sliding assembly 5 also has a self-locking effect through the cooperation of the screw nut 322 and the transmission member 33.

[0122] 4 , 5 , 6 , 7 and 8 , in some embodiments, the driving motor 31 is disposed at one end of the support base 1 close to the projection screen 300 .

[0123] Exemplarily, the drive motor 31 is arranged at a position of the support base 1 close to the projection screen 300, that is, the drive motor 31 is located at one end of the telescopic platform 100 close to the projection screen 300. Since the controller 4 is usually also installed at the end of the support base 1 close to the projection screen 300, the end of the support base 1 close to the projection screen 300 has a certain installation space for placing the controller 4. The drive motor 31 is installed at a position of the support base 1 close to the projection screen 300, and the part of the installation space except the controller 4 can be utilized. If the drive motor 31 is installed at the end of the support base 1 away from the projection screen 300, in order to make the support base 1 accommodate the drive motor 31, the size of the support base 1 along the first direction needs to be increased. Therefore, installing the drive motor 31 at the position of the support base 1 close to the projection screen 300 is conducive to the miniaturization of the telescopic platform 100.

[0124] By arranging the driving motor 31 at one end of the support base 1 close to the projection screen 300 , the space of the support base 1 close to the projection screen 300 is utilized, which is conducive to the miniaturization of the telescopic platform 100 .

[0125] 1 , 2 , 3 , 13 and 14 , in some embodiments, an adjusting bolt 22 is provided on the movable platform 2 , and the adjusting bolt 22 is used to connect with a fixing hole on the projection host 200 , so as to drive the projection host 200 to move along the axial direction of the adjusting bolt 22 by rotating the adjusting bolt 22 .

[0126] 1 and 2 , the movable platform 2 may include a movable platform body 21 and an adjusting bolt 22 . The movable platform body 21 is movably disposed on the support base 1 and is connected to the transmission member 33 . The adjusting bolt 22 is disposed on the movable platform body 21 . The projection host 200 is provided with a fixing hole for wall mounting. The adjusting bolt 22 is connected to the fixing hole. The depth of the connection between the adjusting bolt 22 and the fixing hole of the projection host 200 is adjusted by rotating the adjusting bolt 22 , thereby driving the axial movement of the adjusting bolt 22 .

[0127] As shown in Figures 9 to 11, the adjusting bolt 22 can include a height adjustment bolt 221 and a locking bolt 224; an adjusting hole 211 is provided on the movable platform body 21, and the height adjustment bolt 221 is provided on a side of the movable platform body 21 away from the support base 1, and one end of the height adjustment bolt 221 is used for threaded connection with the fixing hole of the projection host 200, and the other end of the height adjustment bolt 221 is inserted into the adjusting hole 211 and provided with a locking screw hole; the locking bolt 224 is provided on a side of the movable platform body 21 close to the support base, and the locking bolt 224 passes through the adjusting hole 211 and is threadedly connected to the locking screw hole, and the insertion depth of the locking bolt 224 in the locking screw hole is adjusted by rotating the height adjustment bolt 221.

[0128] For example, the mobile platform body 21 can be a rectangular panel, and the projection host 200 can be placed on the mobile platform body 21. The adjustment hole 211 can be a through hole on the mobile platform body 21. The adjustment hole 211 can be an oblong hole extending in a direction parallel to the mobile platform body 21. Of course, the adjustment hole 211 can also be a rectangular through hole. The end of the height adjustment bolt 221 can be movable in the adjustment hole 211, so that the position of the height adjustment bolt 221 on the mobile platform body 21 can be adjusted to indicate that the height adjustment bolt 221 can adapt to projection hosts 200 of different sizes.

[0129] The number of the above-mentioned adjusting bolts 22 and adjusting holes 211 can be multiple, and multiple adjusting holes 211 can be arranged at intervals on the upper side of the moving platform body 21. The number of adjusting bolts 22 can be equal to the number of adjusting holes 211, so that each adjusting hole 211 is provided with an adjusting bolt 22. Of course, the number of adjusting bolts 22 can also be less than the adjusting holes 211. For example, the number of adjusting holes 211 is ten, and the number of adjusting bolts 22 is two, and the two adjusting bolts 22 can be respectively connected to two of the ten adjusting holes 211.

[0130] As shown in Figures 9 to 11, an adjustment plate 222 is provided at the end of the screw of the above-mentioned height adjustment bolt 221. The adjustment plate 222 can be a flat plate. The adjustment plate 222 extends radially along the height adjustment bolt 221. The end of the screw of the height adjustment bolt 221 that is not provided with the adjustment plate 222 is used to be connected with the wall-mounted hole connection bolt of the projection host 200, so that the user can apply a driving force to the adjustment plate 222 with his fingers to rotate the height adjustment bolt 221, thereby facilitating the adjustment of the connection length between the bolt of the height adjustment bolt 221 and the wall-mounted hole of the projection host 200. The end of the height adjustment bolt 221 close to the adjustment plate 222 is used to be inserted into the adjustment hole 211, and the end of the height adjustment bolt 221 away from the adjustment plate 222 is used to be connected with the wall-mounted fixing hole of the projection host 200.

[0131] The end of the above-mentioned height adjustment bolt 221 can be passed through the adjustment hole 211. Of course, the end of the height adjustment bolt 221 can also be located in the adjustment hole 211. A locking screw hole is provided at the end of the height adjustment bolt 221 close to the adjustment hole 211. The height adjustment bolt 221 and the locking bolt 224 are respectively provided on both sides of the moving platform body 21. A gasket 223 can be provided on the side of the moving platform body 21 close to the locking bolt 224, so that after the locking bolt 224 passes through the gasket 223, the screw rod of the locking bolt 224 is connected to the locking screw hole of the height adjustment bolt 221. By tightening the locking bolt 224, the locking bolt 224 is tightly fitted with the height adjustment bolt 221 through the gasket 223, so that the position of the height adjustment bolt 221 on the moving platform body 21 is fixed.

[0132] The movable platform 2 includes a movable platform body 21 and an adjusting bolt 22. The adjusting bolt 22 is provided on the movable platform body 21 and is used to be connected to the fixing hole of the projection host 200. The height position of the projection host 200 on the movable platform body 21 can be adjusted by adjusting the connection length of the bolt 22 and the fixing hole of the projection host 200. The adjusting bolt 22 includes a height adjustment bolt 221, a locking bolt 224 and a gasket 223. The height adjustment bolt 221 and the locking bolt 224 are respectively provided on both sides of the movable platform body 21. An adjusting hole 211 is provided on the movable platform body 21. The height adjustment bolt 221 and the locking bolt 224 adjustment hole 211 are connected to each other. The gasket 223 is provided between the end of the locking bolt 224 and the movable platform body 21, so that after the locking bolt 224 and the height adjustment bolt 221 are tightened, the positions of the height adjustment bolt 221 and the locking bolt 224 on the movable platform body 21 are kept stable by pressure.

[0133] 4 and 5 , in some embodiments, the telescopic platform 100 , such as a telescopic platform 100 used in an ultra-short-throw projection device, further includes a controller 4 , which is electrically connected to the drive motor 31 for controlling the start and stop of the drive motor 31 .

[0134] Furthermore, the controller 4 is configured to stop the drive motor 31 when the current drawn by the drive motor 31 exceeds a set current. This configuration allows the drive motor 31 to stall if a user's finger becomes trapped between the mobile platform 2 and the support base 1, causing the current drawn by the drive motor 31 to rapidly increase. Even if the user fails to remove their hand from the gap between the mobile platform 2 and the support base 1 in time, the current monitoring by the controller 4 can prevent further injury to the user's finger.

[0135] Exemplarily, the controller 4 may be a circuit board, but may also be a chip or a microcomputer. When the movable platform 2 moves from the extended position toward the rear end of the support base 1 and returns to the retracted position, if there is a foreign object in the space between the baffle of the movable platform 2 and the support base 1 or the user's finger is inserted into the space between the baffle of the movable platform 2 and the support base 1, when the drive motor 31 drives the movable platform 2 toward the projection screen 300, the movable platform 2 will first contact the foreign object or the user's finger, causing resistance to the movement of the movable platform 2. The elastic buffer mechanism 34 is further compressed or further stretched, increasing the force borne by the transmission member 33. At this time, the drive motor 31 is similar to a stalled working state, causing the output current of the drive motor 31 to increase. The set current value may be a safe current of the drive motor 31. Of course, the set current value may also be set according to actual conditions. When the output current of the drive motor 31 increases to greater than the set current, the drive motor 31 stops working, so that the movable platform 2 will no longer apply pressure to the user's finger or foreign object, so that even if the user is unable to pull his finger out from between the support base 1 and the movable platform 2 in time, he will not be pinched.

[0136] In some embodiments, an electrical connection port is provided on the telescopic platform 100, and the telescopic platform 100 is electrically connected to the projection host 200 through the electrical connection port, so that the telescopic movement of the mobile platform 2 relative to the support base 1 is controlled by a remote control adapted to the projection host 200, and the telescopic position of the mobile platform 2 relative to the support base 1 is displayed in real time through the projection screen 300; when the mobile platform moves relative to the support base so that the projection host 200 moves to the set projection position relative to the projection screen 300, the remote control controls the drive motor 31 to stop running, and the controller records the position of the mobile platform at this time as the extended position of the mobile platform.

[0137] For example, the telescopic platform 100 may be provided with a USB interface, or a data transmission port of commonly used specifications. The electrical connection interface may be connected to the controller 4. The projection host 200 may be connected to the electrical connection interface using a data cable, so that the signal received by the projection host 200 may be transmitted to the controller 4 of the telescopic platform 100 through the electrical connection interface. The remote control adapted for the projection host 200 may send a signal to the projection host 200, and the projection host 200 may perform a projection operation according to the signal sent by the remote control. The operating system of the projection host 200 may include a module corresponding to the telescopic platform 100, so that the signal sent by the remote control received by the projection host 200 can be transmitted to the controller 4 of the telescopic platform 100, and the remote control may also be able to control the telescopic platform 100.

[0138] The above-mentioned projection host 200 can project a progress bar onto the projection screen 300. When the progress bar is 0%, it indicates that the movable platform 2 is in the retracted position. When the progress bar is 100%, it indicates that the movable platform 2 is in the extreme position of movement relative to the support base 1. Each position of the movable platform 2 between the retracted position and the extreme position corresponds to the progress bar, so that the distance the movable platform 2 is extended from the retracted position can be intuitively reflected to the user, making it convenient for the user to control the movement of the movable platform 2; of course, the specific value of the distance the movable platform 2 is extended from the retracted position can also be projected on the projection screen 300. When the active component 32 is a screw rod 321 and a screw rod nut 322, the numerical value of the movement distance of the movable platform 2 can be calculated by the number of rotations of the screw rod 321 and the angle of the thread on the screw rod 321. When the active component 32 is a gear and a rack, the numerical value of the movement distance of the movable platform 2 can be obtained by calculating the tooth spacing of the gear and the rack.

[0139] The above-mentioned set projection position can be a position where the projection image of the projection host 200 on the projection screen 300 has the best projection effect, and the set projection position can be used as the extended position; when the movable platform 2 moves to the extended position, the remote control controls the movable platform 2 to stop moving, and the controller 4 of the telescopic platform 100 is used to record this position. The operation of recording the position can be that the controller 4 records the distance that the movable platform 2 needs to move from the retracted position to the extended position, that is, the controller 4 records the number of steps that the drive motor 31 needs to rotate from the retracted position to the extended position; when the telescopic platform 100 is turned off, the movable platform 2 will return to the retracted position. When the telescopic platform 100 is turned on, since the controller 4 records the distance required to move to the extended position, the user can use the recorded extended position and the drive motor 31 to drive the movable platform 2 to move the distance corresponding to the recorded position, so that the drive motor 31 drives the movable platform 2 to the extended position. The user does not need to manually debug each time the telescopic platform 100 is turned on, thereby improving the user experience.

[0140] By providing an electrical connection port on the telescopic platform 100, the telescopic platform 100 is electrically connected to the projection host 200 through the electrical connection port, so that the projection host 200 projects the real-time position of the telescopic movement of the movable platform 2 relative to the support base 1 onto the projection screen 300, so that the user can intuitively recognize the distance moved by the movable platform 2 and better adjust the position of the movable platform 2. The remote control adapted to the projection host 200 controls the telescopic movement of the movable platform 2 relative to the support base 1, and the controller 4 can record the extended position of the movable platform 2. After the telescopic platform 100 records the position, each time it is used, the controller calls the recorded position and controls the drive motor 31 to drive the movable platform 2 to automatically move to the recorded extended position, avoiding the need for the user to manually adjust the position of the movable platform 2 each time the telescopic platform 100 is used, thereby improving the user experience.

[0141] As shown in Figure 5, in some embodiments, a detector 61 is provided on the support base 1, the detector 61 is electrically connected to the controller 4, and a sensing member 62 is provided on the transmission member 33; the sensing member 62 is configured to move with the transmission member 33 under the drive of the drive motor 31, and the sensing member 62 triggers the detector 61 when the transmission member 33 drives the movable platform 2 to move to the retracted position, and the controller 4 receives the detection signal of the detector 61 and controls the drive motor 31 to stop running; the controller 4 is also used to record the output step number of the drive motor 31 when controlling the movable platform 2 to move from the retracted position to the extended position, and control the drive motor 31 to stop working when the output step number is greater than the set step number.

[0142] Exemplarily, the detector 61 can be a photoelectric gate or a laser detector, and the sensing member 62 can be a rectangular plate arranged on the transmission member 33. When the movable platform 2 is in the retracted position, the position of the transmission member 33 causes the sensing member 62 to cover the detector 61, causing the detector 61 to be triggered and send a signal to the controller 4 to stop the drive motor 31, thereby ensuring that when the movable platform 2 moves to the retracted position, the drive motor 31 stops working and the movable platform 2 remains stably in the driving position.

[0143] Each time the telescopic platform 100 is shut down, the controller 4 controls the driving device 3 to provide driving force to the movable platform 2, so that the movable platform 2 moves to the retracted position. After the movable platform 2 moves to the position where the sensing member 62 covers the detector 61, the driving device 3 stops working, thereby ensuring that the movable platform 2 can be accurately and stably located in the retracted position each time the telescopic platform 100 is shut down, that is, each time the telescopic platform 100 is started, the movable platform 2 starts to move from the retracted position.

[0144] The output steps of the above-mentioned driving device 3 are the output steps of the driving motor 31 in one direction. When the driving motor 31 outputs torque in one direction, the movable platform 2 can be moved from the retracted position to the extended position. The driving motor 31 outputs torque in the other direction so that the movable platform 2 can be moved from the extended position to the retracted position. The output steps of the driving motor 31 correspond to the moving distance of the movable platform 2. The value of the set step number is set according to the length of the support base 1 along the first direction or the length of the screw rod 321 in the active member 32. As long as the output steps of the driving motor 31 are less than or equal to the set step number, the transmission member 33 will not detach from the end of the screw rod 321 away from the driving motor 31, or the movable platform 2 will not move too long in the first direction to cause part of the structure of the movable platform 2 to collide with the support base 1. The value of the set step number can be set according to actual conditions, and the maximum distance the movable platform 2 moves relative to the retracted position is limited by the value of the set step number.

[0145] After the above-mentioned telescopic platform 100 is started, as long as the number of steps output by the drive motor 31 in one direction is greater than the set number of steps, the drive motor 31 will stop working, thereby stopping the movement of the movable platform 2. The maximum moving distance of the movable platform 2 is limited by the set number of steps, so that the structure of the end of the support base 1 away from the drive motor 31 in the first direction does not need to be provided with a detection device, and the effect of limiting the maximum distance of the movable platform 2 moving along the first direction can be achieved.

[0146] By setting a detector 61 on the support base 1, the detector 61 is electrically connected to the controller 4, and a sensing member 62 is provided on the transmission member 33, so that when the movable platform 2 moves to the retracted position, the sensing member 62 can correspond to the detector 61 and transmit a signal to the controller 4, so that the controller 4 controls the drive motor 31 to stop working, ensuring that the movable platform 2 automatically stops moving after moving to the retracted position, avoiding the movable platform 2 from moving too far when retracting, causing the lead screw nut 322 to collide with the drive motor 31 and be damaged, ensuring the accuracy and stability of the movable platform 2 when returning to the retracted position; the output step number of the drive motor 31 corresponds to the moving distance of the movable platform 2 along the first direction. By setting a set step number, the controller 4 can limit the maximum moving distance of the movable platform 2 relative to the retracted position according to the set step number, avoiding the movable platform 2 from moving too far relative to the retracted position, causing the lead screw nut 322 to disengage from the lead screw 321, or the movable platform 2 to collide with part of the structure of the support base 1, thereby improving the user experience of the telescopic platform 100.

[0147] When the telescopic platform 100 provided by the embodiment of the present disclosure is used, the support base 1 is installed on a flat surface of a TV cabinet or other furniture, the projection host 200 is placed on the mobile platform body 21, the screw of the height adjustment bolt 221 is threadedly connected to the wall-mounting hole of the projection host 200, and the adjustment plate 222 of the height adjustment bolt 221 is rotated to adjust the connection length between the projection host 200 and the screw of the height adjustment bolt 221, thereby adjusting the posture of the projection host 200, and the projection host 200 is connected to the electrical connection port of the telescopic platform 100. The remote control is used to control the power on of the projection host 200 and the start-up of the telescopic platform 100. The mobile platform 2 is in the retracted position when the telescopic platform 100 is turned off.

[0148] A signal is sent to the controller 4 using the remote control, and the controller 4 controls the drive motor 31 to start, the screw rod 321 rotates, and the screw nut 322 moves along the screw rod 321 in the direction away from the drive motor 31. The transmission member 33 moves with the screw nut 322 driven by the elastic buffer mechanism 34, and the sliding assembly 5 moves with the transmission member 33, so that the movable platform 2 moves together with the transmission member 33, and the movable platform 2 moves from the retracted position to the extended position. The projection host 200 projects the distance moved by the movable platform 2 relative to the retracted position on the projection screen 300 in real time. When the movable platform 2 moves to the point where the projection of the projection host 200 on the projection screen 300 has the best projection effect, the remote control sends a signal to the controller 4 to control the drive motor 31 to stop working. The position at this time is the extended position. The controller 4 records the extended position and the distance required to move to the extended position, and the projection host 200 performs the projection work.

[0149] During the process of extending the mobile platform 2 from the retracted position, if the number of steps output by the drive motor 31 to drive the mobile platform 2 to move away from the retracted position is greater than the set number of steps, the controller 4 controls the drive motor 31 to stop working, and the remote control continues to output the signal to move the mobile platform 2 away from the retracted position, and the controller 4 keeps the drive motor 31 stopped.

[0150] After the projection host 200 finishes projection, the remote control sends a shutdown signal to the telescopic platform 100 and the projection host 200, the projection host 200 is shut down, and the controller 4 controls the drive motor 31 to output torque, so that the screw rod 321 rotates and drives the screw nut 322 to move toward the direction close to the drive motor 31, and the screw nut 322 drives the transmission member 33 to move together through the elastic buffer mechanism 34, and the transmission member 33 drives the sliding assembly 5 to move, so that the movable platform 2 moves together with the transmission member 33 toward the direction close to the drive motor 31. After the transmission member 33 moves until the sensing member 62 on it corresponds to the detector 61 on the support base 1, the movable platform 2 retracts to the position and the drive motor 31 stops working; when the telescopic platform 100 is started again, a signal can be sent to the controller 4 so that the controller 4 drives the motor 31 to drive the movable platform 2 according to the recorded extended position, so that the movable platform 2 automatically moves to the recorded extended position.

[0151] During the process of the mobile platform 2 moving from the extended position to the retracted position, if the user's finger is inserted into the gap between the mobile platform 2 and the support base 1, the mobile platform 2 first contacts the user's finger during the movement. Since the user's finger has a certain hardness, the resistance encountered by the mobile platform 2 moving toward the retracted position increases. At this time, the elastic buffer mechanism 34 is further gradually compressed, the speed of reducing the distance between the mobile platform 2 and the support base 1 slows down, the resistance encountered by the lead screw nut 322 also increases, and the current output by the drive motor 31 gradually increases. When the controller detects that the current output by the drive motor 31 is greater than the set current, the controller controls the drive motor 31 to stop working, so that the mobile platform 2 stops moving and protects the user's fingers.

[0152] When the user's finger is pinched, the elastic buffer mechanism 34 acts as a buffer, slowing down the speed at which the distance between the mobile platform 2 and the support base 1 decreases when the user's finger is pinched, and stops the operation of the drive motor 31 in time by comparing the output current of the drive motor 31 with the set current, so that the user has time to react and can pull his finger out of the gap between the mobile platform 2 and the support base 1 bracket.

[0153] Furthermore, the current telescopic platform has the following problems: when in use, multiple cables (such as power cables, data cables, network cables, etc.) usually need to be connected to the projection host to ensure the normal operation of the laser TV. However, in the process of the mobile platform driving the projection host to move, multiple cables will move with the projection host, causing the cables to be easily clamped between the mobile platform and the base of the telescopic platform, causing the cables to hinder the mobile platform from driving the projection host to move, affecting the user experience.

[0154] 13 and in combination with FIG15 , an embodiment of the present disclosure provides a telescopic platform 100 for a projection device, which is used to support a projection host 200 of the projection device and drive the projection host 200 to switch between an extended position and a retracted position to adjust the relative distance between the projection host 200 and a projection screen 300, thereby ensuring a good projection display effect.

[0155] Exemplarily, the telescopic platform 100 includes a support base 1 and a movable platform 2, and the support base 1 has an installation space 10 inside; the movable platform 2 is movably arranged on the support base 1, and is used to carry the projection host 200 of the projection equipment, and drives the projection host 200 to move to an extended position when the projection host 200 is turned on to adjust the distance between the projection host 200 and the projection screen 300, and drives the projection host 200 to move to a retracted position when the projection host 200 is turned off, thereby ensuring that a certain distance is maintained between the projection host 200 and the projection screen 300 during projection, so as to ensure that the projection equipment has a good projection display effect.

[0156] Among them, a reserved opening 20 is provided on the mobile platform 2, which is connected to the installation space 10 in the support base 1, and the reserved opening 20 is used for the cable 201 of the projection host 200 to pass through and enter the installation space 10; the support base 1 is provided with a wire outlet 11, which is connected to the installation space 10, and the wire outlet 11 is used for the cable 201 of the projection host 200 to pass through and connect to the external interface.

[0157] It should be understood that the normal operation of the projection host 200 requires at least a connection to an external power supply through a power cord, and when the projection host 200 is connected to equipment such as audio equipment, a data cable and an audio cable are also required. The projection host 200 can also be connected to a network cable. The cable 201 can be one or a combination of a power cable, a data cable, an audio cable and a network cable. One end of the cable 201 is connected to the projection host 200, and the other end extends in a direction away from the projection host 200 and is respectively connected to equipment such as a power supply, an audio device and a network terminal. The interface of the device connected to the cable 201 such as the power cable, data cable, audio cable and network cable is the external interface; in order to adapt to various situations, the power cable, data cable, audio cable and network cable are relatively long.

[0158] The projection host 200 needs to project an image onto the projection screen 300. A certain distance needs to be met between the projection host 200 and the projection screen 300 in order to project a clear image on the projection screen 300. When the width of furniture such as a TV cabinet where the projection host 200 is placed is insufficient, a telescopic platform (which can be called a telescopic platform 100) for the projection equipment needs to be provided. The projection host 200 is placed on the telescopic platform 100. After the projection host 200 is turned on, the movable platform 2 of the telescopic platform moves to an extended position in a direction away from the projection screen 300, so that the projection host 200 can project a clear image on the projection screen 300. After the projection host 200 is turned off, the movable platform 2 of the telescopic platform moves to a retracted position in a direction close to the projection screen 300, thereby reducing the overall space occupied by the telescopic platform 100.

[0159] During the movement of the mobile platform 2 between the extended position and the retracted position, the projection host 200 moves with the mobile platform 2, and the cable 201 of the projection host 200 also needs to move with the projection host 200. Due to the gravity of the cable 201, the cable 201 is likely to be connected to the support base 1 after moving to the extended position with the mobile platform 2. When the mobile platform 2 moves toward the retracted position, the cable 201 is likely to be stuck in the gap between the mobile platform 2 and the support base 1, hindering the mobile platform 2 from moving to the retracted position, and also easily causing damage to the cable 201.

[0160] The telescopic platform provided in the embodiment of the present disclosure realizes that the cable 201 on the projection host 200 is placed in the installation space 10 of the support base 1 by passing the cable 201 connected to the projection host 200 through the reserved opening 20 into the installation space 10 and passing through the cable outlet 11 to exit the installation space 10. When the projection host 200 moves between the extended position and the retracted position, the reserved opening 20 and the cable outlet 11 can limit the cable 201, so that the cable 201 located above the telescopic platform is placed in the installation space 10, so that the cable 201 will not overlap with the support base 1, that is, the cable 201 will not be clamped in the gap between the movable platform 2 and the support base 1 and hinder the movement of the movable platform 2.

[0161] For example, as shown in Figure 17, the support base 1 can be a box structure, the internal space of the box structure is the installation space 10, and the movable platform 2 is slidably set on the surface of the support base 1. Of course, the support base 1 can also have a bottom plate and four vertical plates, the bottom plate is a rectangular structure, and the four vertical plates are respectively arranged at the four edges of the bottom plate and connected to each other, so that the space enclosed by the bottom plate and the four vertical plates serves as the installation space 10, and the movable platform 2 is slidably set on the side of the bottom plate of the support base 1 facing the installation space 10.

[0162] A driving device 3 can be set in the above-mentioned support base 1, and the driving device 3 is connected to the support base 1. The output end of the driving device 3 is connected to the movable platform 2, so that the movable platform 2 can move between the extended position and the retracted position; a slider and a slide rail can be set in the installation space 10, and the slide rail is set on the support base 1 along the direction from the extended position to the retracted position, the slider is slidably connected to the slide rail, and the slider is connected to the movable platform 2, so that the movable platform 2 is movably set on the support base 1.

[0163] The above-mentioned movable platform 2 can be a rectangular plate, or of course it can be a box structure that is mounted on the support base 1 along the extended position toward the retracted position, and an opening is provided on one side of the box structure, so that when the movable platform 2 moves, the support base 1 can pass through the opening without affecting the movement of the movable platform 2; as shown in Figure 15, a through hole can be provided on the movable platform 2 as a reserved opening 20, so that the cable 201 can pass through the reserved opening 20 into the installation space 10, and of course a notch can be provided on the edge of one side of the movable platform 2 close to the projection screen 300, and the notch extends toward the side away from the projection screen 300, so that the cable 201 can pass through the notch and enter the installation space 10.

[0164] The above-mentioned wire outlet 11 can be a through hole set on the support base 1, which is connected to the installation space 10, so that the cable 201 in the installation space 10 can pass through the wire outlet 11 and out of the installation space 10, thereby connecting the cable 201 to the power supply, audio, network terminal and other settings, so that the projection host 200 can work.

[0165] The cable 201 in the installation space 10 is arranged in a direction from the extended position to the retracted position, and the length of the portion of the cable 201 located in the installation space 10 is greater than the distance between the extended position and the retracted position, so that the reserved opening 20 can be connected to the cable 201, for example, by connecting the cable 201 to the reserved opening 20 through a clamp or glue, so that after the cable 201 passes through the reserved opening 20, the reserved opening 20 limits the movement of the cable 201 relative to the reserved opening 20. The cable 201 is a flexible cable that can bend and deform, so that when the mobile platform 2 is in the retracted position, the portion of the cable 201 located in the installation space 10 is in a bent state. During the process of the mobile platform 2 moving to the extended position, the cable 201 gradually stretches to prevent the mobile platform 2 from breaking the cable 201.

[0166] The cable outlet 11 can also be connected to the cable 201, for example, by connecting the cable 201 to the cable outlet 11 through a clamp or casters. After the cable 201 passes through the cable outlet 11, the cable outlet 11 limits the movement of the cable 201 relative to the cable outlet 11, and the cable 201 can be bent and deformed. When the movable platform 2 is in the retracted position, the part of the cable 201 located in the installation space 10 is in a bent state. When the movable platform 2 moves to the extended position, the cable 201 gradually stretches, thereby preventing the movable platform 2 from breaking the cable 201 when it moves.

[0167] It is understandable that both the reserved opening 20 and the wire outlet 11 can be connected to the cable 201, so that after the cable 201 passes through the reserved opening 20 and the wire outlet 11, the reserved opening 20 limits the movement of the cable 201 relative to the reserved opening 20, and the wire outlet 11 limits the movement of the cable 201 relative to the wire outlet 11. The length of the portion of the cable 201 located in the installation space 10 is greater than the distance between the extended position and the retracted position. The cable 201 can bend, so that when the mobile platform 2 is in the retracted position, the portion of the cable 201 located in the installation space 10 is in a bent state, and the cable 201 gradually stretches during the process of the mobile platform 2 moving to the extended position.

[0168] The length of the portion of the cable 201 within the installation space 10 is greater than the distance between the extended position and the retracted position. This allows the cable 201 to bend and deform within the installation space 10 when the mobile platform 2 moves, allowing part of the cable 201 to move with the mobile platform 2, thereby preventing the cable 201 from being broken when the mobile platform 2 moves.

[0169] Of course, it is not limited to the reserved opening 20 and the wire outlet 11 having a gap with the cable 201, so that the cable 201 can move relative to the reserved opening 20 and the wire outlet 11, and the length of the portion of the cable 201 located in the installation space 10 is greater than the distance between the extended position and the retracted position. When the movable platform 2 is in the retracted position, the cable 201 is in a bent state. During the process of the movable platform 2 moving to the extended position, the cable 201 gradually unfolds, or when the movable platform 2 is in the extended position, the length of the cable 201 located in the installation space 10 is less than the distance between the extended position and the retracted position. When the movable platform 2 moves toward the extended position, the cable 201 moves with the projection host 200, and the portion of the cable 201 located outside the wire outlet 11 enters the installation space 10 with the movement of the projection host 200, so that the cable 201 will not hinder the movement of the movable platform 2, and the cable 201 will not be damaged by the movement of the movable platform 2.

[0170] When the telescopic platform for projection equipment provided by the embodiment of the present disclosure is used, the telescopic platform 100 is installed on a desktop or on a wall near the projection screen 300, and the projection host 200 is placed on the telescopic platform. One end of the cable 201 is electrically connected to the projection host 200, and the other end passes through the reserved opening 20 into the installation space 10, and then passes through the installation space 10 from the outlet 11 to connect with the power supply, audio, network terminal and other components; when the projection host 200 is turned off, the mobile platform 2 is in the retracted position, and the cable 201 in the installation space 10 is in a bent state. After the projection host 200 is turned on, the movable platform 2 moves from the retracted position to the extended position. The projection host 200 drives the cable 201 to move as the movable platform 2 moves. The cable 201 located in the installation space 10 gradually stretches from a bent state. When the movable platform 2 moves to the extended position, the projection host 200 starts to project onto the projection screen 300. When the projection host 200 completes the projection operation, the movable platform 2 moves from the extended position to the retracted position. During this process, the cable 201 located in the installation space 10 gradually bends, the movable platform 2 moves to the retracted position, and the projection host 200 is turned off.

[0171] The telescopic platform for projection equipment provided in the embodiment of the present disclosure provides a reserved opening 20 on the movable platform 2 and a cable outlet 11 on the support base 1. When the projection host 200 is placed on the movable platform 2, the cable 201 of the projection host 200 passes through the reserved opening 20 and enters the installation space 10, and the cable 201 passes through the cable outlet 11 to exit the installation space 10. This arrangement allows the cable 201 of the projection host 200 to be stored in the installation space 10. When the movable platform 2 drives the projection host 200 to move, the portion of the cable 201 of the projection host 200 located in the installation space 10 can move with the movement of the movable platform 2. That is, the cable 201 of the projection host 200 moves inside the telescopic platform 100. Compared with the prior art in which the cable of the projection host is exposed outside, the cable 201 of the projection host 200 does not affect the movement of the movable platform 2 between the extended position and the retracted position, and avoids the cable 201 from getting stuck between the movable platform 2 and the support base 1 when the movable platform 2 moves, thereby improving the stability and smoothness of the movement of the movable platform 2; and realizes the hiding function of the cable 201 of the projection host 200, avoiding the cable 201 of the projection host 200 from being exposed outside, which causes the cable to be messy and affects the user experience.

[0172] 15 , 16 , 17 , 18 , 22 and 23 , in some embodiments, a protective member 7 is provided in the installation space 10 , and both ends of the protective member 7 are connected to the movable platform 2 and the support base 1 , respectively. A protective channel is provided inside the protective member 7 for the cable 201 of the projection host 200 to pass through, and the channel openings at both ends of the protective channel are connected to the reserved opening 20 and the cable outlet 11 , respectively. In this manner, the cable 201 of the projection host 200 enters the installation space 10 of the support base 1 through the reserved opening 20, and then passes through the protective channel on the protective member 7 and then exits from the cable outlet 11. When the movable platform 2 drives the projection host 200 to move, the end of the protective member 7 connected to the movable platform 2 moves with the movable platform 2 and causes the protective member 7 to deform, thereby utilizing the protective member 7 to protect the cable 201 of the projection host 200 located in its protective channel.

[0173] Exemplarily, the protective member 7 can be a flexible hose, the interior of the hose is hollow, so that the space inside the hose serves as a protective channel. The hose is arranged in the installation space 10, with one end of the hose facing the reserved opening 20 and the other end facing the wire outlet 11. A buckle can be provided inside the installation space 10 on the support seat 1, and one end of the hose is connected to the buckle, and the other end is connected to the mobile platform 2. The mobile platform 2 can be provided with buckles on the opposite side facing the support seat 1, so that the end of the hose is snapped into the buckle of the mobile platform 2. Of course, the end of the hose can also be bonded to the mobile platform 2 by glue. After the cable 201 enters the installation space 10 from the reserved opening 20, the cable 201 enters the protective channel from the end of the hose close to the mobile platform 2, and then passes through the protective channel from the end of the hose close to the wire outlet 11. The cable 201 that passes through the protective channel then passes through the installation space 10 from the wire outlet 11.

[0174] Of course, the protective part 7 can also be a hollow tank chain, one end of the tank chain is connected to the support base 1, and the other end is connected to the mobile platform 2. Bolts can be used to connect the tank chain to the support base 1 and the mobile platform 2. Of course, casters can also be used to connect the tank chain to the support base 1 and the mobile platform 2. One end of the tank chain is set toward the reserved opening 20, and the other end is set toward the outlet 11. The space inside the tank chain is the protection channel. The cable 201 located in the installation space 10 enters the protection channel from the end of the tank chain close to the reserved opening 20, and passes through the protection channel from the end of the tank chain close to the outlet 11.

[0175] The distance when the above-mentioned movable platform 2 moves to the maximum distance from the retracted position is the limit position, and the limit position can be made the extended position. Of course, the extended position can also be made between the limit position and the retracted position. The length of the protective member 7 can be greater than or equal to the distance between the limit position and the retracted position, so that when the movable platform 2 is in the retracted position, the protective member 7 is in a bent state. When the movable platform 2 moves toward the extended position, the protective member 7 gradually extends to match the bent state of the cable 201 located in the protection channel. When the movable platform 2 moves to the limit position, when the length of the protective member 7 is equal to the distance between the limit position and the retracted position, the protective member 7 is in a fully extended state. When the length of the protective member 7 is greater than the distance between the limit position and the retracted position, the protective member 7 is still in a bent state.

[0176] By setting up the telescopic platform, the protective member 7 also includes a protective member 7, which has a protective channel and can bend and deform. The two ends of the protective member 7 are respectively connected to the movable platform 2 and the support base 1, so that the protective member 7 can bend and stretch as the movable platform 2 moves, so that the cable 201 located in the installation space 10 can be located in the protective channel of the protective member 7, avoiding that when the cable 201 bends and stretches as the movable platform 2 moves, the cable 201 contacts other components of the telescopic platform in the installation space 10, resulting in obstruction of the bending and stretching deformation of the cable 201, and can also avoid the cable 201 from getting knotted during the bending and stretching process, thereby improving the stability of the cable 201 located in the installation space 10 and the smoothness of movement.

[0177] 15 , 17 , 18 , 22 and 23 , in some embodiments, one end of the protective member 7 is a movable end 71 and the other end is a fixed end 72. The fixed end 72 is fixedly connected to the support base 1 and is located at the wire outlet 11. The movable end 71 is fixedly connected to the movable platform 2 and is located at the reserved opening 20. When the movable platform 2 drives the projection host 200 to move between the extended position and the retracted position, the movable end 71 moves with the movable platform 2 toward or away from the fixed end 72, so that the protective member 7 is bent or stretched.

[0178] For example, a connecting piece extending toward the installation space 10 can be provided on the reserved opening 20, and the movable end 71 is fixedly connected to the end of the connecting piece away from the reserved opening 20, so that the movable end 71 is located near the reserved opening 20. Of course, the movable end 71 can also be fixedly connected to the side of the mobile platform 2 facing the support base 1, and the movable end 71 is located near the reserved opening 20.

[0179] A vertical plate can be set on the inner wall of the installation space of the above-mentioned support seat 1, and the vertical plate is located near the wire outlet 11. The fixed end 72 is fixedly connected to the vertical plate. The fixed end 72 can be fixedly connected to the vertical plate by bolts or rivets. Of course, the fixed end 72 can also be fixedly connected to the inner wall of the support seat 1 by bolts or rivets, and the fixed end 72 is located near the wire outlet 11.

[0180] When the movable platform 2 moves from the retracted position toward the extended position, the movable end 71 moves in a direction away from the fixed end 72, the distance between the movable end 71 and the fixed end 72 gradually increases, and the protective member 7 gradually extends. When the movable platform 2 moves from the extended position toward the retracted position, the movable end 71 moves in a direction close to the fixed end 72, the distance between the movable end 71 and the fixed end 72 gradually decreases, and the protective member 7 gradually bends.

[0181] The movable end 71 can be provided with an entry, which is connected to the protective channel. The movable end 71 is close to the reserved opening 20, so that the cable 201 passing through the reserved opening 20 can enter the protective channel through the entry. The fixed end 72 is provided with an exit, which is connected to the protective channel. The cable 201 located in the protective channel can pass out from the exit, and the cable 201 bends and stretches together with the protective member 7 in the protective member 7.

[0182] By setting one end of the protective member 7 as a movable end 71 and the other end as a fixed end 72, the fixed end 72 is fixedly connected to the support base 1, and the movable end 71 is fixedly connected to the movable platform 2, so that when the movable end 71 moves with the movable platform 2, the movable end 71 and the fixed end 72 approach and move away from each other, so that the protective member 7 bends and stretches, and the fixed end 72 is located near the outlet 11, and the movable end 71 is located near the reserved opening 20, which is convenient for the cable 201 to pass through the reserved opening 20 and then pass through the protective channel from the mobile end 71, and convenient for the cable 201 to pass through the fixed end 72 and then pass through the installation space 10 from the outlet 11. The positions of the movable end 71 and the fixed end 72 are reasonably set, which is convenient for the cable 201 to pass through the protective channel of the protective member 7 and then pass through the outlet 11.

[0183] 15 , 16 , 17 , 18 , 22 and 23 , in some embodiments, the protective member 7 includes a tank chain 73 , one end of the tank chain 73 is connected to the mobile platform 2 as a mobile end 71 , and the other end is connected to the support base 1 as a fixed end 72 ; the tank chain 73 includes a plurality of chain units 731 connected in sequence, adjacent chain units 731 are rotatably connected to each other, and the internal hollow spaces of the plurality of chain units 731 are jointly constructed to form a protective channel; when the mobile platform 2 drives the projection host 200 to move between the extended position and the retracted position, at least some of the chain units 731 rotate with each other to cause the tank chain 73 to bend or stretch as the mobile platform 2 moves.

[0184] For example, the chain unit 731 can be made into a rectangular hollow structure, with rotation holes provided at both ends of the chain unit 731. After multiple chain units 731 are arranged in a straight line, the rotation holes of two adjacent chain units 731 overlap, and rivets are used to pass through the rotation holes of two adjacent chain units 731 to make the two chain units 731 rotationally connected. Among the multiple chain units 731, two adjacent chain units 731 are all rotationally connected, so that the tank chain 73 can achieve bending and unfolding operations through the relative rotation between the multiple chain units 731.

[0185] Since the chain unit 731 is a hollow structure, after multiple chain units 731 are connected in sequence along a straight line, the space inside the multiple chain units 731 together forms a protection channel, and the tank chain 73 is also penetrated by the protection channel, so that the mobile platform 2 can be provided with a connecting piece extending toward the support seat 1, and one end of the tank chain 73 is connected to the end of the connecting piece away from the mobile platform 2 to serve as the mobile end 71. Of course, one end of the tank chain 73 can also be connected to the end of the mobile platform 2 toward the support seat 1 as the mobile end 71; the other end of the tank chain 73 is fixedly connected to the support seat 1 as the fixed end.

[0186] When the mobile platform 2 is in the retracted position, the tank chain 73 is in a bent state. When the mobile platform 2 moves toward the extended position, the distance between the mobile end 71 and the fixed end 72 increases, and the tank chain 73 gradually extends. When the mobile platform 2 moves toward the retracted position, the distance between the mobile end 71 and the fixed end 72 decreases, and the tank chain 73 gradually bends. The cable 201 bends and stretches together with the tank chain 73 in the tank chain 73.

[0187] By setting the protective part 7 including a tank chain 73, the tank chain 73 includes a plurality of chain units 731, the chain unit 731 is a hollow structure, the plurality of chain units 731 are connected in sequence, and the two adjacent tank chains 73 are rotatably connected, so that the tank chain 73 can bend and stretch, and a protective channel is formed inside the tank chain 73. Since each chain unit 731 of the tank chain 73 has a certain structural strength, when the cable 201 is located inside the tank chain 73, the tank chain 73 has a better protective effect on the cable 201, and the bending and stretching of the tank chain 73 moves the mutual rotation of the plurality of chain units 731, which can avoid the movement of the tank chain 73 during bending and stretching and keep it stable, and avoid the tank chain 73 from interfering with other parts in the telescopic platform when bending.

[0188] In other embodiments, the protective member 7 includes a flexible tube, one end of the flexible tube is connected to the movable table 2 as a movable end 71, and the other end is connected to the support base 1 as a fixed end 72; the interior of the flexible tube is hollow to form a protective channel, and when the movable table 2 drives the projection host 200 to move between the extended position and the retracted position, the flexible tube bends or stretches and deforms as the movable table 2 moves.

[0189] Exemplarily, the flexible tube can be made into a bendable hose, and a buckle can be set on the mobile platform 2 near the reserved opening 20, so that one end of the flexible tube can be snapped into the buckle of the mobile platform 2 to serve as the mobile end 71, and a buckle is set on the inner wall of the installation space 10 of the support base 1 at the position where the wire outlet 11 is snapped into, and the other end of the flexible tube is snapped into the buckle of the support base 1 to serve as the fixed end 72.

[0190] When the mobile platform 2 is in the retracted position, the flexible tube is in a bent state. When the mobile platform 2 moves toward the extended position, the distance between the movable end 71 and the fixed end 72 increases, and the flexible tube gradually stretches. When the mobile platform 2 moves toward the retracted position, the distance between the movable end 71 and the fixed end 72 decreases, and the flexible tube gradually bends. The cable 201 bends and stretches together with the flexible tube in the flexible tube.

[0191] By providing the protective member 7 including a flexible tube, a protective channel is provided inside the flexible tube, and the two ends of the flexible tube are respectively connected to the movable platform 2 and the support seat 1. The production cost of the flexible tube is low, and the cable 201 located in the installation space 10 can be constrained to avoid interference between the cable 201 and the components in the telescopic platform during the movement of the movable platform 2, thereby reducing the production cost of the telescopic platform and improving the stability of the cable 201 in the installation space 10.

[0192] In some embodiments, a cable restraint track (not shown) is provided in the installation space 10, and the cable restraint track extends along the moving direction of the movable platform 2 so that the cable 201 of the projection host 200 entering the installation space 10 moves along the cable restraint track.

[0193] For example, the inner wall of the installation space 10 can be provided with a groove extending from the extended position toward the retracted position as a cable restraint track, and the part of the cable 201 located in the installation space 10 is located in the groove, so that the cable 201 is located in the cable restraint track when it bends and stretches with the movement of the mobile platform 2, which can avoid the cable 201 from interfering with other parts in the telescopic platform due to bending and stretching when it moves with the mobile platform 2.

[0194] Of course, two parallel vertical plates can also be set on the inner wall of the installation space 10 on the side facing the movable platform 2. The two vertical plates extend in the direction from the extended position to the retracted position. The space between the two vertical plates forms a cable constraint track. The part of the cable 201 located in the installation space 10 is located in the cable constraint track, so that the cable 201 is located in the cable constraint track when it bends and stretches as the movable platform 2 moves.

[0195] By setting up a cable constraint track in the installation space, the cable 201 is located within the cable constraint track when it bends and stretches as the mobile platform 2 moves. This can prevent the cable 201 from interfering with other parts in the telescopic platform due to bending and stretching when it moves with the mobile platform 2, thereby improving the stability of the moving trajectory of the cable 201 in the installation space 10.

[0196] 15 , 16 , 17 , 18 , 22 , and 23 , in some embodiments, a partition 1020 is provided in the installation space 10 . The partition 1020 extends along the moving direction of the mobile stage 2 . The partition divides the installation space into a first installation area 101 and a second installation area 102 .

[0197] The first installation area 101 is provided with a driving device 3 , which is connected to the movable platform 2 and is used to drive the movable platform 2 to move between an extended position and a retracted position. The cable 201 of the projection host 200 entering the installation space is located in the second installation area 102 .

[0198] For example, the first installation area 101 and the second installation area 102 can both be rectangular areas, and the first installation area 101 and the second installation area 102 can both extend in the direction from the retracted position toward the extended position. The edges of one side of the first installation area 101 and the second installation area 102 that are close to each other can be fit together. Of course, the first installation area 101 and the second installation area 102 can also be set apart from each other.

[0199] In a specific implementation, a partition 1020 may be provided on at least one side edge of the second installation area 102 close to the first installation area 101 , and the partition 1020 extends from the retracted position toward the extended position.

[0200] For example, the partition 1020 can be set on the side of the support base 1 facing the movable platform 2. The partition 1020 can be a rectangular plate. The partition 1020 can be connected to the support base 1 by bolts, and of course, the partition 1020 can also be connected to the support base 1 by riveting.

[0201] The number of partitions 1020 can be one, and the partition 1020 is set at the edge of the second installation area 102 close to the first installation area 101. Of course, the number of partitions 1020 can also be two, and the two partitions are set at the edge of the second installation area 102 close to the first installation area 101 and away from the first installation area 101.

[0202] The driving device 3 is fixedly connected to the support base 1, and the output end of the driving device 3 is connected to the movable platform 2. Since the output end of the driving device 3 is in motion when driving the movable platform 2 to move, in order to avoid interference between the cable 201 located in the installation space 10 and the driving device 3, as shown in Figure 18, the driving device 3 is installed in the first installation area 101, the cable 201 is located in the second installation area 102, and the reserved opening 20 and the outlet 11 are both arranged opposite to the second installation area 102; the protective member 7 can be arranged in the second installation area 102, thereby ensuring that the cables 201 in the installation space 10 are all located in the second installation area 102. When the movable platform 2 moves, the driving device 3 outputs driving force to the movable platform 2 in the first installation area 101, and the cable 201 bends and stretches in the second installation area 102.

[0203] By setting a partition 1020 in the installation space 10, the partition 1020 extends along the moving direction of the movable platform 2, and the partition 1020 divides the installation space into a first installation area 101 and a second installation area 102. The cable 201 in the installation space 10 is located in the second installation area 102, so that when the movable platform 2 moves, the driving device 3 outputs driving force to the movable platform 2 in the first installation area 101, and the cable 201 bends and stretches in the second installation area 102, thereby avoiding interference between the cable 201 and the driving device 3, and rationally arranging the positions of the driving device 3 and the cable 201 in the installation space 10, thereby improving the safety of the cable 201 moving in the installation space 10; and the partition 1020 prevents the cable 201 from being too long in the second installation area 102 and entering the first installation area 101 when bending, thereby improving the stability of the cable 201 in the second installation area 102 when bending and stretching.

[0204] 15 to 18 and 20 to 23 , in some embodiments, a first limiting portion is provided at the reserved opening 20 , and the first limiting portion is used to limit the movement of the cable 201 of the projection host 200 located at the reserved opening 20 relative to the reserved opening 20 .

[0205] For example, a buckle can be provided on the inner wall of the reserved opening 20 as a first limiting portion, so that after the cable 201 passes through the reserved opening 20, the buckle is engaged with the cable 201, thereby allowing the first limiting portion to limit the movement of the cable 201 relative to the reserved opening 20; of course, glue can also be provided at the reserved opening 20 as a first limiting portion, so that after the cable 201 passes through the reserved opening 20, it is bonded to the glue, thereby limiting the movement of the cable 201 relative to the reserved opening 20.

[0206] By providing a first limiting portion at the reserved opening 20 for limiting the movement of the cable 201 relative to the reserved opening 20, the cable 201 is connected to the first limiting portion after passing through the reserved opening 20, thereby ensuring that the cable 201 moves together with the reserved opening 20 when the movable platform 2 moves, and avoiding the cable 201 being disconnected from the projection host 200 when the friction force on the cable 201 in the installation space 10 is large, ensuring that the cable 201 moves with the movable platform 2 to maintain connection with the projection host 200, and improving the stability of the position of the cable 201 on the telescopic platform.

[0207] 15 to 18 and 20 to 23 , in some embodiments, a second limiting portion is provided at the cable outlet 11 , and the second limiting portion is used to limit the movement of the cable 201 of the projection host 200 located at the cable outlet 11 relative to the cable outlet 11 .

[0208] For example, a buckle can be provided on the inner wall of the cable outlet 11 as the first limiting portion, so that after the cable 201 passes through the cable outlet 11, the buckle engages with the cable 201, thereby causing the second limiting portion to limit the movement of the cable 201 relative to the cable outlet 11. Of course, adhesive can also be provided on the cable outlet 11 as the first limiting portion, so that after the cable 201 passes through the cable outlet 11, it adheres to the adhesive, thereby limiting the movement of the cable 201 relative to the cable outlet 11.

[0209] By providing a second limiting portion at the cable outlet 11 for limiting the movement of the cable 201 relative to the cable outlet 11, the cable outlet 11 can limit the length of the cable 201 within the installation space 10, thereby preventing the movement of the mobile platform 2 from causing the cable 201 to move relative to the cable outlet 11, resulting in insufficient length within the installation space 10 and limiting the moving distance of the mobile platform 2.

[0210] In some embodiments, the reserved opening 20 can be provided with a first limiting portion for limiting the movement of the cable 201 relative to the reserved opening 20, and the outlet 11 can be provided with a second limiting portion for limiting the movement of the cable 201 relative to the outlet 11, so that both ends of the cable 201 located in the installation space 10 are restricted, thereby improving the stability of the cable 201 located in the installation space 10 when moving.

[0211] Furthermore, the current telescopic platform has the following problems: after the telescopic platform is installed with the projection host, its overall height is relatively high and it occupies a large space.

[0212] In some embodiments of the present disclosure, please refer to Figure 25, one of the support base 1 and the movable platform 2 is provided with a guide groove 124, and the other is provided with a sliding member group 113 adapted to the guide groove 124, that is, the support base 1 may be provided with a guide groove 124, and the movable platform 2 may be provided with a sliding member group 113; or the support base 1 may be provided with a sliding member group 113, and the movable platform 2 may be provided with a guide groove 124.

[0213] For example, referring to Figures 26 and 27, the movable platform 2 is formed into a U-shaped structure and includes a platform 121, a first folded edge 122, and a second folded edge 123. The first folded edge 122 and the second folded edge 123 are arranged opposite each other and are located on both sides of the width direction of the platform 121. The guide groove 124 is located on the first folded edge 122 and the second folded edge 123. The movable platform 2 is clamped on the support base 1, and the support base 1 includes a first support wall 111 and a second support wall 112 opposite each other. The first support wall 111 is arranged opposite the first folded edge 122, and the second support wall 112 is arranged opposite the second folded edge 123. The first support wall 111 and the second support wall 112 are provided with a sliding member group 113.

[0214] Among them, the structures of the first fold edge 122 and the second fold edge 123 can be the same, and the structures of the first support wall 111 and the second support wall 112 can be the same. The following is an example of the guide groove 124 on the first fold edge 122 and the sliding member group 113 on the first support wall 111.

[0215] As shown in FIG29, the guide groove 124 may include a first guide wall 1241 and a second guide wall 1242 relative to each other. As shown in FIG27-28, the sliding member group 113 may include a first sliding member 1131 and a second sliding member 1132. Exemplarily, the first sliding member 1131 and the second sliding member 1132 may be sliding wheels or sliding bearings.

[0216] It should be noted that during the movement of the movable platform 2, the rotation directions of the first sliding member 1131 and the second sliding member 1132 are opposite. In some embodiments of the present disclosure, the first sliding member 1131 abuts against the first guide wall 1241 and has a distance between it and the second guide wall 1242; the second sliding member 1132 abuts against the second guide wall 1242 and has a distance between it and the first guide wall 1241.

[0217] If the first slider 1131 and the second slider 1132 are disposed opposite each other in the height direction of the movable platform 2, and the first slider 1131 and the second slider 1132 are spaced apart from each other, the independent rotation of the first slider 1131 and the second slider 1132 is ensured. However, since the first slider 1131 and the second slider 1132 are disposed opposite each other in the height direction of the telescopic platform 100, taking the diameter of the first slider 1131 as D1 and the diameter of the second slider 1132 as D2 (D1 can be equal to D2) as an example, the height occupied by the first slider 1131 and the second slider 1132 needs to be greater than D1 + D2, which limits the height of the telescopic platform 100 from being further reduced, affecting the overall height and space occupied by the projection device, and not meeting the user's requirements for miniaturization.

[0218] In order to solve the above technical problems, please refer to Figures 27 and 28. The present disclosure also provides a telescopic platform 100, wherein the orthographic projection of the first sliding member 1131 on the first plane partially overlaps with the orthographic projection of the second sliding member 1132 on the first plane, and the first plane is perpendicular to the extension direction of the guide groove 124 (for example, the front-to-back direction shown in Figure 28).

[0219] Taking the diameter of the first sliding member 1131 as D1 and the diameter of the second sliding member 1132 as D2 (where D1 is greater than or equal to D2) as an example, the height of the sliding member group 113 provided in the present disclosure is less than D1+D2, saving space at the height of the telescopic platform 100. Therefore, the height of the telescopic platform 100 provided in the present disclosure can be set lower, reducing the occupied space of the telescopic platform 100 and meeting the requirements of miniaturization of user equipment.

[0220] In some embodiments of the present disclosure, referring to FIG. 28 , first slider 1131 and second slider 1132 are guide bearings of identical specifications. They are spaced apart in the direction of extension of guide slot 124. The orthographic projection of first slider 1131 on a first plane partially overlaps the orthographic projection of second slider 1132 on the first plane, with the first plane being perpendicular to the front-to-back direction. This minimizes the height space occupied by slider assembly 113, thereby reducing the height of the telescopic platform.

[0221] In other embodiments of the present disclosure, the first slider 1131 and the second slider 1132 are guide bearings of the same specifications. The orthographic projection of the first slider 1131 on the second plane partially overlaps with the orthographic projection of the second slider 1132 on the second plane, and the second plane is parallel to the extension direction of the guide groove 124. Furthermore, the orthographic projection of the first slider 1131 on the first plane partially overlaps with the orthographic projection of the second slider 1132 on the first plane. This can reduce the height space occupied by the slider assembly 113 to a certain extent, thereby reducing the height of the telescopic platform 100.

[0222] In some embodiments of the present disclosure, referring to Figures 29 and 30 , a first sliding groove 1243 is provided on the first guide wall 1241. A portion of the first sliding member 1131 extends into the first sliding groove 1243 and can slide along the extension direction of the first sliding groove 1243. Thus, providing the first sliding groove 1243 on the first guide wall 1241 can further enhance the stability of the first sliding member 1131 during the sliding process.

[0223] For example, as shown in FIG30 , the first sliding groove 1243 may include a first inner wall 1244 and a second inner wall 1245 relative to each other, and the first sliding member 1131 is located between the plane where the first inner wall 1244 is located and the plane where the second inner wall 1245 is located. Thus, by setting the first sliding groove 1243, the movement of the first sliding member 1131 in its axial direction can be limited.

[0224] In some examples, a second sliding groove may be provided on the second guide wall 1242, and the second sliding groove is arranged opposite to the first sliding groove 1243 in the up and down directions. Part of the second sliding member 1132 extends into the second sliding groove and can slide along the extension direction of the second sliding groove. In this way, the stability of the second sliding member 1132 during the sliding process can be further improved, thereby improving the stability of the sliding member group 113 during the sliding process.

[0225] In some other embodiments of the present disclosure, please refer to Figures 31 and 32. A first guide groove 1133 is provided on the outer peripheral surface of the first sliding member 1131, and a first guide protrusion 1251 that cooperates with the first guide groove 1133 is provided on the first guide wall 1241. Thus, the sliding of the first sliding member 1131 is limited by the first guide groove 1133 and the first guide protrusion 1251 that cooperate with each other, thereby ensuring the stability of the first sliding member 1131 during the sliding process.

[0226] As shown in FIG32 , the first guide protrusion 1251 can include a first convex surface 1252 and a second convex surface 1253 arranged symmetrically, and the first guide groove 1133 can include a first groove surface 1141 and a second groove surface 1142 arranged symmetrically, wherein the first convex surface 1252 is opposite to the first groove surface 1141, and the second convex surface 1253 is opposite to the second groove surface 1142, thereby achieving the limitation of the first guide protrusion 1251 in the axial direction of the first sliding member 1131, thereby ensuring the stability of the first sliding member 1131 during the sliding process.

[0227] In some other embodiments, a first guide protrusion 1251 may be provided on the outer circumferential surface of the first sliding member 1131 , and a first guide groove 1133 cooperating with the first guide protrusion 1251 may be provided on the first guide wall 1241 .

[0228] In some examples, the outer circumference of the second sliding member 1132 is further provided with a second guide groove, and the second guide wall 1242 is provided with a second guide protrusion 1254 that cooperates with the second guide groove; or the outer circumference of the second sliding member 1132 is provided with a second guide protrusion 1254, and the second guide wall 1242 is provided with a second guide groove that cooperates with the second guide protrusion 1254. In this way, the second guide protrusion 1254 is limited in the axial direction of the second sliding member 1132, thereby ensuring the stability of the second sliding member 1132 during the sliding process, and further ensuring the stability of the sliding member assembly 113 during the sliding process.

[0229] Furthermore, the cross section of the first guide groove 1133 may be formed in a semicircular, elliptical, triangular, inverted trapezoidal, rectangular, or other shapes.

[0230] It is understandable that the cross-section of the first guide protrusion 1251 needs to be formed into a semicircular, elliptical, triangular, inverted trapezoidal, rectangular or other shape that matches the first guide groove 1133 .

[0231] When the cross-sections of the first guide groove 1133 and the first guide protrusion 1251 are formed in a triangular shape, the angle between the first groove surface 1141 and the second groove surface 1142 may be 60°, 75°, 90°, or the like.

[0232] In some embodiments of the present disclosure, please continue to refer to Figures 31 and 32. The first sliding member 1131 may include a first surface 1143 facing the bottom wall of the guide groove 124. The first guide wall 1241 is provided with a first limiting protrusion 126. The first limiting protrusion 126 is located between the first sliding member 1131 and the bottom wall of the guide groove 124, and the first limiting protrusion 126 abuts against the first surface 1143. It should be noted that in order to ensure the relative sliding of the first sliding member 1131 relative to the first guide wall 1241, a clearance fit is required between the first guide groove 1133 and the first guide protrusion 1251. In this way, the provision of the first limiting protrusion 126 can further prevent the first sliding member 1131 from shaking in its axial direction, further ensuring the stability of the first sliding member 1131 during the sliding process.

[0233] In some examples, the second sliding member 1132 may also include a second surface facing the bottom wall of the guide groove 124. The second guide wall 1242 is provided with a second limiting protrusion 127. The second limiting protrusion 127 is located between the second sliding member 1132 and the bottom wall of the guide groove 124, and the second limiting protrusion 127 abuts against the second surface. In this way, the provision of the second limiting protrusion 127 can further prevent the second sliding member 1132 from shaking in its circumferential direction, thereby ensuring the stability of the second sliding member 1132 during the sliding process.

[0234] 33 and 34 , the first limiting protrusion 126 and the second limiting protrusion 127 can be formed as one piece and formed into a U-shape, and are arranged on the inner wall of the guide groove 124. While limiting the first sliding member 1131 and the second sliding member 1132, the thickness of the groove wall of the guide groove 124 can be increased, thereby increasing the strength of the first folding edge 122.

[0235] In some embodiments of the present disclosure, there are multiple sliding member groups 113, and the multiple sliding member groups 113 are arranged at intervals in the extension direction of the guide groove 124. Therefore, by setting multiple sliding member groups 113, the stability of the moving platform 2 and the support base 1 during the movement process can be ensured.

[0236] For example, the number of the sliding member groups 113 may be three, four, five, six, or the like.

[0237] Taking the sliding member in the sliding member group 113 as a guide bearing as an example, the rated dynamic load that a single bearing can withstand is Cr=235N. Taking the telescopic pan-tilt head with five sets of sliding member groups on one side as an example, at least six guide bearings of the telescopic pan-tilt head are loaded at any time, which can withstand a force of 1410N. This allows the telescopic pan-tilt head to bear the weight of the projection host and the impact force in the direction of gravity after the projection host is installed, preventing the telescopic pan-tilt head from deforming and sinking.

[0238] In some embodiments of the present disclosure, the support base 1 is further provided with a drive motor 31 and a transmission member, which includes a screw rod 321 and a nut that are threaded together. The extension direction of the screw rod 321 is parallel to the extension direction of the guide slot 124. One end of the screw rod 321 is connected to the output shaft of the drive motor 31, and the nut is connected to the movable platform 2. In this way, the output shaft of the drive motor 31 drives the screw rod 321 to rotate, and the threaded engagement between the nut and the screw rod 321 converts the rotation of the screw rod 321 into the translation of the nut in the axial direction of the screw rod 321, thereby driving the translation of the movable platform 2 relative to the support base 1.

[0239] The drive motor 31 disclosed herein can utilize a 20 series stepper motor and a reduction gearbox. While achieving the required torque, it can reduce the vertical space occupied by the drive motor, thereby achieving an overall thinning of the telescopic platform (compared to the 28 series stepper motors used in related art). The telescopic platform 100 may further include a controller electrically connected to the drive motor 31. The controller can control the rotation direction of the output shaft of the drive motor 31, thereby controlling the reciprocating movement of the mobile platform 2 relative to the support base 1. The controller can also control the start and stop of the drive motor 31, thereby controlling the mobile platform 2 to stop at the target position.

[0240] In some other embodiments, the support base 1 may also be provided with a first sensor and a second sensor. The first sensor is used to detect whether the movable platform 2 has returned to the retracted position. When the first sensor detects that the movable platform 2 has returned to the retracted position, it transmits an instruction to the controller to stop driving the motor 31. The first sensor involved here is the detector 61 and the sensing member 62 involved above. The second sensor is used to detect whether the movable platform 2 has reached the maximum extended position. When the second sensor detects that the movable platform 2 has reached the maximum extended position, it transmits an instruction to the controller to stop driving the motor 31. In this way, the translation stroke of the nut can be prevented from exceeding the preset stroke, and the components between the movable platform 2 and the support base 1 can be prevented from being damaged due to squeezing or pulling.

[0241] In some embodiments of the present disclosure, as shown in FIG. 25 , the telescopic platform 100 may further include: an adjusting bolt 22 ; the projection host is provided with a fixing hole for wall mounting; the adjusting bolt 22 is used to connect to the fixing hole on the projection host so as to drive the projection host to move along the axial direction of the adjusting bolt 22 by rotating the adjusting bolt 22 .

[0242] For example, an adjustment hole may be provided on the movable platform 2 , and an adjustment bolt 22 is provided on the movable platform 2 . One end of the adjustment bolt 22 is threadedly connected to a fixing hole of the projection host, and the other end is inserted into the adjustment hole.

[0243] Among them, the adjustment hole can be selected as a through hole on the movable platform 2, the adjustment hole can be selected as an oblong hole extending in a direction parallel to the movable platform 2, or the adjustment hole can be selected as a rectangular through hole. The adjusting bolt 22 can move in the adjustment hole, so that the adjusting bolt 22 can be positioned on the movable platform 2, so that the adjusting bolt 22 can adapt to projection hosts of different sizes.

[0244] The number of the above-mentioned adjusting bolts 22 and adjusting holes can be selected to be multiple, and multiple adjusting holes can be set at intervals on the movable platform 2. The number of adjusting bolts 22 can be selected to be equal to the number of adjusting holes, so that each adjusting hole is provided with an adjusting bolt 22. Of course, the number of adjusting bolts 22 can also be selected to be less than the adjusting holes. For example, the number of adjusting holes is selected to be ten, and the number of adjusting bolts 22 is selected to be two, and the two adjusting bolts 22 can be connected to two of the ten adjusting holes respectively.

[0245] In some embodiments of the present disclosure, the projection host provided herein is provided with a relief groove. The relief groove is formed by a portion of the bottom wall of the projection host, recessed away from the telescopic platform 100, and a portion of the telescopic platform 100 extends into the relief groove. Thus, if the internal space of the projection host allows, the relief groove can further reduce the height of the projection host and telescopic platform 100, thereby reducing the space occupied by the projection host and telescopic platform 100, and better meeting user requirements for miniaturization.

[0246] In some implementations, by combining the avoidance groove with the sliding member assembly in the above embodiment, the product thickness of the telescopic pan / tilt head can be reduced by 40.5%, and the overall thickness of the laser host can be reduced by 59% after installation.

[0247] On the other hand, an embodiment of the present disclosure also provides a projection device, which includes a projection host 200, a projection screen 300 and any one of the telescopic platforms 100 mentioned above. The projection host 200 is located on a movable platform of the telescopic platform, and the projection port of the projection host faces the projection screen. The movable platform drives the projection host to move toward or away from the projection screen.

[0248] The projection device provided by the embodiments of the present disclosure possesses all the advantages of any of the telescopic platforms described herein. By mounting the projection host 200 on the mobile platform 2, the mobile platform 2 can move the projection host 200 to adjust the projection distance of the projection host 200 to the projection screen 300. Furthermore, the telescopic platform has a finger-pinching protection feature, preventing the user's fingers from being pinched when the mobile platform 2 returns to its retracted position.

[0249] In some examples, the projection device is an ultra-short-throw projection device.

[0250] In some examples, the projection host 200 is placed on the movable platform 2 of the telescopic platform 100, and a cable 201 is connected to the projection host 200. The end of the cable 201 away from the projection host 200 enters the installation space 10 through the reserved opening 20 and exits from the outlet 11 to connect to the external interface.

[0251] For example, the projection host 200 can be a laser TV or an ultra-short-throw projector, and a cable 201 is plugged into the surface of the projection host 200. The cable 201 is used to connect to the external interfaces of components such as the power supply, audio, and network terminal to enable the projection host 200 to operate normally; the projection host 200 can be provided with an electrical connection socket, and the cable 201 is plugged into the electrical connection socket to achieve electrical connection between the cable 201 and the projection host 200; the end of the cable 201 away from the projection host 200 enters the installation space 10 through the reserved opening 20, and the cable 201 passes through the outlet 11 and out of the outlet 11, and then the cable 201 is connected to components such as the power supply, audio, and network terminal.

[0252] By providing a projection device including a projection host 200 and a telescopic platform 100 as described in any of the above embodiments, the cable 201 of the projection host 200 can enter the installation space 10 through the reserved opening 20 and pass through the cable outlet 11 from the cable outlet 11, so that the portion of the cable 201 close to the telescopic platform is stored inside the telescopic platform, thereby preventing the cable 201 from getting stuck between the mobile platform 2 and the support base 1 when the mobile platform 2 moves, thereby hindering the movement of the mobile platform 2, thereby improving the stability and safety of the movement of the mobile platform 2.

[0253] 19 and 24 , in some embodiments, the projection host 200 is placed at the front end of the mobile platform 2 along the extending direction, and the reserved opening 20 is located behind the projection host 200 along the extending direction of the mobile platform 2 .

[0254] In other embodiments, the projection host 200 is placed at the front end of the movable platform 2 along the extending direction, and the reserved opening 20 is located below the projection host 200 .

[0255] The direction in which the mobile platform 2 can move toward the extended position is the extending direction, which is the direction away from the projection screen 300. The projection host 200 is placed at the front end of the mobile platform 2 along the extending direction, which is the position of the mobile platform 2 away from the projection screen 300. The rear of the projection host 200 along the extending direction of the mobile platform 2 is the position of the mobile platform 2 close to the projection screen 300.

[0256] The projection host 200 can be provided with a plug interface at the bottom position of the side facing the projection screen 300. The cable 201 hangs down naturally after being connected to the plug interface. The reserved opening 20 is located behind the extending direction of the movable platform 2, so that the hanging cable 201 is close to the reserved opening 20, which facilitates the cable 201 to pass through the reserved opening 20. The plug interface is set on the side of the projection host 200 to facilitate the plug-in electrical connection between the cable 201 and the projection host 200.

[0257] Of course, the bottom of the projection host 200 can also be provided with a plug interface, so that the plug interface is set toward the mobile station 2, and the reserved opening 20 is located below the projection host 200. After the cable 201 is connected to the plug interface, it naturally hangs down and is arranged opposite to the reserved opening 20, so that the cable 201 can easily enter the reserved opening 20 from the bottom of the projection host 200, and the projection host 200 can achieve the effect of shielding the cable 201, thereby improving the appearance of the projection host 200.

[0258] Usually, the end of the cable 201 connected to the host is relatively small. When installing the projection host 200, the cable 201 can be separated from the socket connected to the projection host 200 first, and the end of the cable 201 connected to the projection host 200 can be passed through the outlet port 11 to enter the installation space 10, and then passed through the reserved opening 20 to pass out of the installation space 10, and finally electrically connected to the socket of the projection host 200, thereby simplifying the installation operation; of course, the reserved opening 20 can also have a notch extending to the edge of the movable platform 2, and the outlet port 11 can have a notch extending to the edge of the support base 1. When the connecting components at both ends of the cable 201 are large, the middle part of the cable 201 can enter the reserved opening 20 and the outlet port 11 respectively through the notch, so that the part of the cable 201 close to the telescopic platform 100 is stored inside the telescopic platform 100.

[0259] Taking the protective part 7 including the tank chain 73 as an example, when the projection device provided by the embodiment of the present disclosure is used, the telescopic platform is installed on the TV cabinet, the projection host 200 is placed on the mobile platform 2, the cable 201 is electrically connected to the projection host 200, the cable 201 passes through the reserved opening 20 into the installation space 10, and the cable 201 enters the protection channel from the movable end 71 of the tank chain 73 and the fixed end 72 extends out of the protection channel, and then the cable 201 passes through the installation space 10 from the outlet 11, so that the cable 201 is connected to the power supply, audio, network terminal and other equipment, so that the projection host 200 can be used normally.

[0260] When the projection host 200 is turned off, the movable platform 2 is in the retracted position, the tank chain 73 is in a bent state, and the cable 201 located in the installation space 10 bends along with the tank chain 73. After the projection host 200 is started, the driving device 3 drives the movable platform 2 to move toward the extended position, the distance between the movable end 71 and the fixed end 72 of the tank chain 73 increases, the tank chain 73 gradually extends, and the cable 201 gradually extends along with the tank chain 73. After the projection host 200 moves to the extended position, the projection host 200 performs a projection operation on the projection screen 300.

[0261] After the projection host 200 completes projection, the mobile platform 2 moves toward the retracted position, the distance between the movable end 71 and the fixed end 72 of the tank chain 73 decreases, the tank chain 73 gradually bends, and the cable 201 gradually bends along with the tank chain 73. The mobile platform 2 moves to the retracted position and the projection host 200 is turned off. During the movement of the mobile platform 2 between the extended position and the retracted position, the portion of the cable 201 close to the telescopic platform is stored in the tank chain 73 of the installation space 10, preventing the cable 201 from hindering the movement of the mobile platform 2.

[0262] Furthermore, related art requires the installation of a telescopic platform on the projection host to assist the projection host in reaching a desired position. However, once the telescopic platform is installed on the projection host, the layering of the ultra-short-throw projection device becomes more pronounced. Furthermore, users are required to install the telescopic platform themselves, which increases the cost of using the ultra-short-throw projection device and reduces the user experience.

[0263] In response to the above technical problems, the projection device provided in the embodiments of the present disclosure, for example, an ultra-short-throw projection device, has been improved. As shown in Figures 13 and 14 , the projection device 100 may include a projection screen 300 , a projection host 200 and a telescopic platform 100 .

[0264] The projection host 200 may have a top and a bottom relative to each other. The top may be located on a side of the projection host 200 close to the projection screen 300. A projection port of the projection host 200 may be provided on the top, through which the projection host 200 may project an image onto the projection screen 300.

[0265] Referring to Figures 13 and 35 , the bottom of the projection host 200 may be provided with a mounting recess 2001. Specifically, the mounting recess 2001 may be recessed toward the top of the projection host 200. The mounting recess 2001 may have a first opening 20011 and a second opening 20012. The first opening 20011 may be formed on the bottom of the projection host 200. The second opening 20012 may be formed on a side of the projection host 200 that is proximate to the projection screen 300. Specifically, the telescopic platform 100 is located at the bottom of the projection host 200. The second opening 20012 and the first opening 20011 are located on either side of the mounting recess 2001. The first opening 20011 of the mounting recess 2001 is directly opposite the telescopic platform 100, while the second opening 20012 is formed on one circumferential side of the mounting recess 2001 and is located on the side of the mounting recess 2001 that is proximate to the projection screen 300.

[0266] Thus, the installation groove 2001 can be entered through the first opening 20011 and the second opening 20012. Furthermore, since the second opening 20012 is located on the side of the projection host 200 close to the projection screen 300, it is possible to avoid providing an opening on the side of the projection host 200 facing the user, thereby making the side of the projection host 200 facing the user more beautiful and improving the user experience.

[0267] Continuing to refer to Figures 14 and 35, the telescopic platform 100 can be used to drive the projection host 200 to move toward or away from the projection screen 300. The telescopic platform 100 is connected to the projection host 200. Specifically, the focal length of the projected image of the ultra-short-throw projection device 100 is relatively short, so that an image can be projected onto the projection screen 300 when the distance between the projection host 200 and the projection screen 300 is relatively close. In order to ensure the normal projection of the projection host 200, it is necessary to maintain a certain distance between the installation plane of the projection host 200 and the projection screen 300. This will result in a larger size of the TV cabinet where the projection host 200 is placed, or the TV cabinet where the projection host 200 is placed needs to be moved, thereby reducing the user experience. By providing the telescopic platform 100, the projection host 200 is installed on the telescopic platform 100 that can move laterally. The telescopic platform 100 drives the projection host 200 to move toward or away from the projection screen 300, so that the projection host 200 can maintain a suitable distance from the projection screen 300 when working. When the projection host 200 is not in use, the telescopic platform 100 can drive the projection host 200 back to the TV cabinet to reduce the floor space occupied by the projection host 200 and the telescopic platform 100.

[0268] Continuing to refer to Figures 13 and 35, the telescopic platform 100 is connected to the mounting groove 2001 and is provided with a second opening 20012. Specifically, a portion of the telescopic platform 100 is directly disposed within the mounting groove 2001 through the first opening 20011 and the second opening 20012. Since the telescopic platform 100 drives the projection host 200 toward or away from the projection screen 300, the portion of the telescopic platform 100 can pass through the second opening 20012 to move toward or away from the projection screen 300, thereby driving the projection host 200 to move.

[0269] Thus, by providing interconnected first opening 20011 and second opening 20012, an operator can assemble the telescopic platform 100 from the bottom or side of the projection host 200, which helps reduce the difficulty of assembling the telescopic platform 100 and, in turn, the speed of assembling the ultra-short-throw projection device 100. Furthermore, the provision of second opening 20012 facilitates the telescopic platform 100 to move the projection host 200 toward or away from the projection screen 300. Furthermore, the telescopic platform 100 is directly disposed within the mounting recess 2001, which helps improve the integration level of the ultra-short-throw projection device 100 and reduces the sense of layering within the ultra-short-throw projection device 100. Furthermore, the ultra-short-throw projection device 100 can be equipped with the ability to adjust the position of the projection host 200, eliminating the need for user-initiated installation. This reduces the cost of using the ultra-short-throw projection device 100 and improves the user experience.

[0270] According to the ultra-short-throw projection device 100 of the presently disclosed embodiment, by providing a mounting recess 2001 on the projection host 200 and positioning the telescopic platform 100 within the mounting recess 2001, the telescopic platform 100 and the projection host 200 can be integrated, thereby improving the integration level of the ultra-short-throw projection device 100 and reducing the layered appearance of the ultra-short-throw projection device 100. This also avoids the need for users to install additional devices to control the movement of the projection host 200 when using the ultra-short-throw projection device 100, thereby reducing user costs and improving the user experience. Furthermore, by providing a first opening 20011 and a second opening 20012 connected to the mounting recess 2001, an operator can assemble the telescopic platform 100 from the bottom or side of the projection host 200, thereby improving the assembly efficiency of the ultra-short-throw projection device 100. Furthermore, the second opening 20012 can limit the movement of the telescopic platform 100 to the side closest to the projection screen 300, thereby improving the user experience.

[0271] Referring to Figure 36 , the telescopic platform 100 may include a support base 1, a drive device 3, and a sliding assembly 5. The support base 1 may have an installation space 10, and the drive device 3 may be disposed within the installation space 10. The drive device 3 may drive the projection host 200 to move toward or away from the projection screen 300. The projection host 200 may have an extended position and a retracted position. For further explanation of the extended and retracted positions, please refer to the above description and will not be repeated here.

[0272] The drive device 3 may include a drive motor 31 and an active member 32. The output end of the drive motor 31 may be in driving connection with the active member 32. The active member 32 may be movably connected to the sliding assembly 5. The sliding assembly 5 may be connected to the projection host 200 to drive the projection host 200 to switch between an extended position and a retracted position via the sliding assembly 5. This control method is simple.

[0273] It should be noted that the sliding assembly 5 may be directly connected to the projection host 200 or indirectly connected to the projection host 200 .

[0274] For example, as shown in FIG36 , the active part 32 may include a screw rod 321 and a screw nut 322 that cooperate with each other. Regarding the arrangement of the screw rod 321 and the screw nut 322, please refer to the above-mentioned related description and will not be repeated here. In short, this arrangement has a simple structure and is easy to operate, which is conducive to reducing the manufacturing cost of the telescopic platform 100.

[0275] For example, the output end of the driving motor 31 may be connected to the active member 32 via a coupling. The driving device 3 may further include a sensor, which may sense the movement of the active member 32.

[0276] Referring to Figures 36 and 37 , the telescopic platform 100 includes a movable platform 2 for supporting the projection host 200. The movable platform 2 is movably mounted on the support base 1 and connected to the sliding assembly 5. A drive motor 31 drives an active member 32 to move the sliding assembly 5, which in turn drives the movable platform 2 via the sliding assembly 5.

[0277] Thus, the support base 1 can be protected by the movable platform 2, dust can be prevented from entering the support base 1, and the service life of the telescopic platform 100 can be improved. At the same time, the movable platform 2 can be directly connected to the projection host 200, which can reduce the difficulty of assembly and help increase the assembly speed of the ultra-short-throw projection device 100.

[0278] For example, the movable platform 2 and the projection host 200 can be detachably connected. This arrangement facilitates replacement and maintenance of the telescopic platform 100, thereby improving the maintainability of the ultra-short-throw projection device 100. The movable platform 2 and the projection host 200 can be detachably connected by bolts, snap-fits, or the like.

[0279] Continuing with Figures 36 and 37 , in some embodiments, the projection host 200 may include a lower housing 2002. A portion of the lower housing 2002 is recessed toward the projection screen 300 to form a mounting groove 2001. The movable platform 2 is connected to the lower housing 2002. Thus, the structure of the lower housing 2002 can be modified directly by changing the mold design of the lower housing 2002, thereby reducing the impact on the overall structure of the projection host 200 and facilitating cost reduction for the ultra-short-throw projection device 100. Furthermore, the movable platform 2 is directly connected to the lower housing 2002, allowing the lower housing 2002 and the movable platform 2 to support the movement of the projection host 200, thereby improving the reliability and stability of the movement of the projection host 200.

[0280] Referring to Figures 38 and 39 , in some embodiments, the telescopic platform 100 may further include a support member 8. The sliding assembly 5 is connected to the support member 8. The support member 8 may be disposed on the bottom wall of the mounting recess 2001 and located between the support base 1 and the sidewalls of the mounting recess 2001. The support member 8 extends in a direction toward or away from the projection screen.

[0281] For example, in a direction perpendicular to the movement of the projection host 1, the support member 8 can be located on one side of the support base 1 and connected to the mounting groove 2001. Therefore, when the drive motor 31 drives the sliding assembly 5 to move, since the sliding assembly 5 is connected to the support member 8, the sliding assembly 5 can drive the support member 8 to move, and the support member 8 can also serve as a guide for the movement of the projection host 1, which is beneficial to improving the reliability of the movement of the ultra-short-throw projection device 100 and also beneficial to reducing the manufacturing cost of the ultra-short-throw projection device 100.

[0282] Exemplarily, the telescopic platform 100 includes multiple support members 8. The multiple support members 8 can be spaced apart on the bottom wall of the mounting groove 2001, and the sliding assembly 5 is connected to the support members 8. The "multiple" support members 8 refers to two or more support members 8, and the multiple support members 8 can be evenly spaced on the bottom wall of the mounting groove 2001. This further improves the reliability of the movement of the ultra-short-throw projection device 100.

[0283] For example, the number of support members 8 can be two, and the two support members 8 can be respectively opposite to the two opposite side walls of the support base 1. In this way, they can be connected to the support base 1 first, and then connected to the mounting groove 2001, so as to facilitate pre-positioning the installation position of the support members 8 and reduce the difficulty of assembly.

[0284] 38 and 39 , in some embodiments, the support member 8 is detachably connected to the projection host 200. This facilitates replacement and repair of damaged support members 8, thereby improving the maintainability of the ultra-short-throw projection device 100.

[0285] For example, the support member 8 may be provided with a mounting hole, and the projection host 200 may be provided with a mating hole corresponding to the mounting hole. By inserting bolts through the mounting hole and the mating hole, the support member 8 and the projection host 200 can be detachably connected. This arrangement is simple in structure, facilitates installation of the support member 8, and helps to increase the assembly speed of the ultra-short-throw projection device 100.

[0286] For example, the installation groove 2001 of the projection host 200 may further be provided with an adjustment hole for installing a device for adjusting the pitch angle of the projection host 200 .

[0287] Continuing with Figures 38 and 39 , in some embodiments, the sliding assembly 5 may include a slider 52 and a slide rail 51. The slide rail 51 is disposed within the installation space 10. The slide rail 51 may extend in a direction toward or away from the projection screen 300. Specifically, when the active member 32 includes a screw rod 321 and a screw nut 322, the slide rail 51 may be parallel to the screw rod 321.

[0288] The slider 52 is slidably mounted on the slide rail 51 along the extension direction of the slide rail 51. One end of the slider 52 is connected to the support member 8, and the other end is connected to the active member 32. Therefore, when the drive motor 31 drives the active member 32 to move, the active member 32 can drive the slider 52 along the extension direction of the slide rail 51, thereby driving the support member 8 to move, so that the support member 8 can drive the projection host 200 to switch between the extended position and the retracted position.

[0289] Therefore, by setting the slide rail 51, the sliding direction of the slider 52 can be restricted, and the slider 52 can also slide more stably in the direction close to or away from the projection screen 300, which is beneficial to improving the stability and reliability of the movement of the projection host 200.

[0290] Continuing with Figures 38 and 39 , in some embodiments, there may be multiple sliders 52 . Multiple sliders 52 may be spaced apart on the slide rail 51 . This allows the support member 8 to be connected to multiple sliders 52 , preventing breakage between the support member 8 and the sliders 52 , and further improving the stability and reliability of the projection host 200 .

[0291] For example, the slider 52 can be detachably connected to the support member 8. The detachable connection can be achieved by fasteners, clips, etc. This facilitates replacement of the slider 52 or the support member 8, thereby improving the service life and maintainability of the telescopic platform 100 and enhancing the user experience.

[0292] For example, the slider 52 is detachably connected to the active member 32. Thus, the maintainability of the ultra-short-throw projection device 100 can be further improved.

[0293] In some embodiments, the slider 52 is connected to the mounting groove 2001. Thus, the slider 52 can be connected to the projection host 1 while being connected to the support member 8, so that the projection host 1 can have more connection points, which can improve the reliability of the connection between the telescopic platform 100 and the projection host 1, thereby improving the stability and reliability of the movement of the projection host 200.

[0294] Referring to Figure 40 , in some embodiments, the installation space 10 may have a third opening 103 on a side near the projection host 200. Thus, the drive device 3 can be directly placed into the installation space 10 of the support base 1 through the third opening 103, facilitating assembly of the drive device 3. This helps reduce the difficulty of assembling the drive device 3 and, in turn, helps increase the assembly speed of the ultra-short-throw projection device 100.

[0295] The telescopic platform 100 may further include a dustproof member 9, which is disposed at the third opening 103. Thus, the dustproof member 9 can prevent dust and other debris from entering the installation space 10 through the third opening 103, thereby improving the safety and reliability of the drive device 3.

[0296] There is a distance between the dustproof member 9 and the supporting member 8. Thus, the dustproof member 9 can be prevented from interfering with the movement of the projection host 200, which is beneficial to improving the stability and reliability of the movement of the projection host 200.

[0297] The dustproof member 9 is used to cover the portion of the third opening 103 that exposes the projection host 1 when the projection host 1 is moved. Specifically, when the projection host 200 is in the extended position, the dustproof member 9 can cover the portion of the third opening 103 that does not overlap with the projection host 200. This allows the projection host 1 and the dustproof member 9 to be fully utilized to protect the installation space 10 from dust, which helps reduce the manufacturing cost of the telescopic platform 100. It should be noted that the dustproof member 9 can also completely cover the third opening 103.

[0298] Referring to Figure 41 , in some embodiments, the projection host 200 may include a lower housing 2002 . A portion of the lower housing 2002 is recessed toward the projection screen 300 to form a mounting recess 2001 . The support member 8 is connected to the lower housing 2002 . Directly connecting the support member 8 to the lower housing 2002 eliminates the need for a movable platform, reducing the manufacturing cost of the ultra-short-throw projection device 100 . This also improves the integration of the ultra-short-throw projection device 100 , allowing more of the telescopic platform 100 to be concealed within the mounting recess 2001 .

[0299] Referring to FIG. 42 , in some embodiments, the projection host 200 may include a lower shell 2002 and a base 2003. The lower shell 2002 may have a storage space. The base 2003 may be located within the storage space and stacked with the lower shell 2002. The mounting groove 2001 is located on the lower shell 2002 and communicates with the storage space, and the support member 8 is connected to the base 2003. Specifically, the base 2003 may be provided with components related to projection, and the base 2003 is located within the storage space of the lower shell 2002. The mounting groove 2001 hollows out the lower shell 2002, exposing the base 2003 within the storage space, and the base 2003 is connected to the support member 8. As a result, the support member 8 can be directly connected to the base 2003, which can reduce the manufacturing cost of the lower shell 2002, thereby helping to reduce the manufacturing cost of the ultra-short-throw projection device 100. At the same time, the integration level of the ultra-short-throw projection device 100 can be further improved, which is beneficial to the thin design of the ultra-short-throw projection device 100. It should be noted that the mobile station 2 can also be directly connected to the base 2003.

[0300] The above descriptions are merely some exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A telescopic platform, wherein: The telescopic platform comprises: a support base, on which a driving device is arranged; A moving platform, movably arranged on the supporting seat and connected to the driving device, used to carry a projection host of the projection device, and to drive the projection host to move to an extended position when the projection host is turned on to adjust the distance between the projection host and the projection screen, and to drive the projection host to move to a retracted position when the projection host is turned off; Wherein, the driving device comprises a driving motor, an active member and a transmission member, the output end of the driving motor is connected to the active member, the active member is connected to the transmission member, and the transmission member is connected to the mobile platform, so as to drive the mobile platform to switch between the extended position and the retracted position through the transmission member; An elastic buffer mechanism is provided at the connection position between the active member and the transmission member, so as to realize elastic connection between the active member and the transmission member through the elastic buffer mechanism.

2. The telescopic platform according to claim 1, wherein: Mounting holes are correspondingly provided on the active member and the transmission member, and the active member is connected to the transmission member via a fastener penetrating through the mounting hole. The elastic buffer mechanism is sleeved on the fastener and elastically supported between one of the active member and the transmission member and the fastener, or elastically supported between the active member and the transmission member.

3. The telescopic platform according to claim 2, wherein: The active part includes a screw and a screw nut, the screw is connected to the output end of the drive motor, the screw nut is sleeved on the screw and threadedly connected to the screw, and the drive motor drives the screw nut to perform reciprocating linear motion on the screw; The mounting holes are correspondingly arranged on the screw nut and the transmission member, the screw nut is connected to the transmission member via the fastener penetrating the mounting hole, the elastic buffer mechanism is sleeved on the fastener, and is elastically supported between the screw nut and one of the transmission member and the fastener, or is elastically supported between the screw nut and the transmission member.

4. The telescopic platform according to claim 3, wherein: The fastener comprises a connecting bolt and a connecting nut, one end of the connecting bolt passes through the screw nut and the transmission member and is threadedly connected with the connecting nut, and the elastic buffer mechanism comprises an elastic member, the elastic member is sleeved on the connecting bolt and elastically supported between the connecting nut and the transmission member; And / or, the number of the elastic buffer mechanisms is at least two, and at least two of the elastic buffer mechanisms are arranged at intervals along the central axis of the screw nut; And / or, a mounting through hole is provided on the transmission member, and the transmission member is sleeved on the lead screw nut through the mounting through hole, and a clearance fit is formed between the mounting through hole and the lead screw nut.

5. The telescopic platform according to any one of claims 1 to 4, wherein: The transmission member comprises a transmission plate and a connecting member connected to each other, the transmission plate is connected to the active member, and the connecting member is connected to the moving platform; Optionally, two sliding assemblies are provided on the support seat, and the two sliding assemblies are respectively provided on both sides of the driving device, the connecting member is connected to one of the sliding assemblies, the mobile platform is fixedly connected to the two sliding assemblies, and the connecting member transmits power to the mobile platform via the sliding assembly fixedly connected to the connecting member.

6. The telescopic platform according to any one of claims 1 to 5, wherein: The driving motor is arranged at one end of the support base close to the projection screen; And / or, an adjusting bolt is provided on the movable platform, and the adjusting bolt is used to be connected with a fixing hole on the projection host, so that the projection host is driven to move along the axial direction of the adjusting bolt by rotating the adjusting bolt.

7. The telescopic platform according to any one of claims 1 to 5, wherein: The telescopic platform further includes a controller, which is electrically connected to the drive motor and is used to control the start and stop of the drive motor, and the controller is used to control the drive motor to stop working when the current of the drive motor is greater than a set current; Optionally, the telescopic platform is provided with an electrical connection port, and the telescopic platform is electrically connected to the projection host through the electrical connection port, so that the telescopic movement of the mobile platform relative to the support base is controlled by a remote controller adapted to the projection host, and the telescopic position of the mobile platform relative to the support base is displayed in real time on the projection screen; When the movable platform moves relative to the support base to make the projection host move relative to the projection screen to a set projection position, the remote controller controls the driving motor to stop running, and the controller records the position of the movable platform at this time as the extended position of the movable platform.

8. The telescopic platform according to any one of claims 1 to 7, wherein: The support seat has an installation space inside; The movable platform is provided with a reserved opening, the reserved opening is communicated with the installation space in the support seat, and the reserved opening is used for allowing the cable of the projection host to pass through and enter the installation space; The support base is provided with a wire outlet, the wire outlet is communicated with the installation space, and the wire outlet is used for allowing the cable of the projection host to pass through so as to be connected with an external interface.

9. The telescopic platform according to claim 8, wherein: A protective member is provided in the installation space, and two ends of the protective member are respectively connected to the moving platform and the supporting seat, and a protective channel for the cables of the projection host to pass through is provided inside the protective member, and the channel openings at both ends of the protective channel are respectively connected to the reserved opening and the outlet; When the moving platform drives the projection host to move, the end of the protective member connected to the moving platform moves along with the moving platform, causing the protective member to deform; Optionally, one end of the protective member is a movable end, and the other end is a fixed end, the fixed end is fixedly connected to the support seat, and the fixed end is located at the outlet, and the movable end is fixedly connected to the mobile station, and the movable end is located at the reserved opening; When the movable platform drives the projection host to move between the extended position and the retracted position, the movable end moves with the movable platform toward or away from the fixed end, so that the protective element is bent or stretched.

10. The telescopic platform according to claim 9, wherein: The protective member comprises a tank chain, one end of which is connected to the mobile platform as the mobile end, and the other end of which is connected to the support base as the fixed end; The tank chain comprises a plurality of chain units connected in sequence, adjacent chain units are rotatably connected, and the internal hollow spaces of the plurality of chain units together form the protection channel; When the moving platform drives the projection host to move between the extended position and the retracted position, at least part of the chain units rotate relative to each other so that the tank chain bends or stretches as the moving platform moves; or, The protective member comprises a flexible tube, one end of which is connected to the mobile platform as the mobile end, and the other end of which is connected to the support base as the fixed end; The hollow interior of the flexible tube forms the protection channel. When the movable platform drives the projection host to move between the extended position and the retracted position, the flexible tube bends or stretches and deforms along with the movement of the movable platform.

11. The telescopic platform according to any one of claims 8 to 10, wherein: A cable restraint track is provided in the installation space, and the cable restraint track is extended along the moving direction of the moving platform, so that the cable of the projection host entering the installation space moves along the cable restraint track; And / or, a partition is provided in the installation space, the partition is extended along the moving direction of the mobile platform, and the partition divides the installation space into a first installation area and a second installation area; The driving device is arranged in the first installation area, and the cable of the projection host entering the installation space is located in the second installation area; And / or, a first limiting portion is provided at the reserved opening, and the first limiting portion is used to limit the movement of the cable of the projection host located at the reserved opening relative to the reserved opening; And / or, a second limiting portion is provided at the cable outlet, and the second limiting portion is used to limit the movement of the cable of the projection host located at the cable outlet relative to the cable outlet.

12. The telescopic platform according to claims 1-11, wherein: One of the support seat and the moving platform is provided with a guide groove, and the other is provided with a sliding member group adapted to the guide groove, the guide groove includes a first guide wall and a second guide wall opposite to each other, the sliding member group includes a first sliding member and a second sliding member, the first sliding member abuts against the first guide wall and has a spacing with the second guide wall, and the second sliding member abuts against the second guide wall and has a spacing with the first guide wall; The orthographic projection of the first sliding member on the first plane partially overlaps with the orthographic projection of the second sliding member on the first plane, and the first plane is perpendicular to the extending direction of the guide groove.

13. The telescopic platform according to claim 12, wherein: A first sliding groove is provided on the first guide wall, and a portion of the first sliding member extends into the first sliding groove and can slide along an extension direction of the first sliding groove; or, A first guide groove is disposed on the outer peripheral surface of the first sliding member, and a first guide protrusion matched with the first guide groove is disposed on the first guide wall.

14. The telescopic platform according to claim 12, wherein: The first sliding member includes a first surface facing the bottom wall of the guide groove, the first guide wall is provided with a first limiting protrusion, the first limiting protrusion is located between the first sliding member and the bottom wall of the guide groove, and the first limiting protrusion abuts against the first surface; And / or, there are multiple sliding member groups, and the multiple sliding member groups are arranged at intervals in the extension direction of the guide groove.

15. A projection device, wherein: The projection device comprises a projection host, a projection screen and a telescopic platform according to any one of claims 1 to 14, wherein the projection host is located on a moving platform of the telescopic platform, a projection port of the projection host faces the projection screen, and the moving platform drives the projection host to move toward or away from the projection screen; Optionally, the projection device is an ultra-short-throw projection device.

16. The projection device according to claim 15, wherein: The support base of the telescopic platform has an installation space inside, the support base is also provided with a wire outlet, and the moving platform of the telescopic platform is provided with a reserved opening; The projection host is connected to a cable, and one end of the cable away from the projection host enters the installation area of ​​the telescopic platform through the reserved opening. The cable is installed in the space and passes through the cable outlet to be connected to an external interface; Optionally, the projection host is placed at the front end of the mobile platform along the extending direction, and the reserved opening is located behind the projection host along the extending direction of the mobile platform; or, the projection host is placed at the front end of the mobile platform along the extending direction, and the reserved opening is located below the projection host.

17. The projection device according to claim 15, wherein: The projection host is provided with an avoidance groove, which is recessed from a portion of the bottom wall of the projection host toward a direction away from the telescopic platform, and a portion of the telescopic platform extends into the avoidance groove.

18. The projection device according to claim 15, wherein: A mounting groove is provided at the bottom of the projection host, and the mounting groove has a first opening and a second opening. The first opening is formed at the bottom of the projection host, and the second opening is formed on the side wall of the projection host close to the projection screen and is connected to the first opening. The telescopic pan head is connected to the mounting groove and passes through the second opening.

19. The projection device according to claim 18, wherein: The telescopic platform comprises a support base, a moving platform and a sliding assembly, wherein the moving platform is movably arranged on the support base and connected to the sliding assembly, and the moving platform is also connected to the mounting groove; and / or, The projection host comprises a lower shell, a portion of the lower shell is recessed toward a direction close to the projection screen to form the mounting groove, and the mobile platform is connected to the lower shell; and / or, The telescopic platform further includes a support member, the support member is connected to the transmission member, the support member is arranged on the bottom wall of the mounting groove and is located between the support seat and the side wall of the mounting groove, and the support member extends in a direction close to or away from the projection screen; And / or, a side of the mounting groove close to the projection host has a third opening, and the telescopic pan head also includes a dustproof member, which is arranged at the third opening and has a distance between the dustproof member and the support member, and the dustproof member is used to cover the third opening to expose the portion of the projection host when the projection host moves.

20. The projection device according to any one of claims 18 to 19, wherein: The projection host comprises a lower shell, a portion of the lower shell is recessed toward a direction close to the projection screen to form the installation groove, and the support member is connected to the lower shell; or, The projection host comprises a lower shell and a base, the lower shell has a receiving space, the base is located in the receiving space and is stacked with the lower shell, the mounting groove is located on the lower shell and communicates with the receiving space, and the support is connected to the base.

Images