Telescopic platform and projection equipment

Abstract

The invention relates to the technical field of laser televisions, and provides a telescopic platform and projection equipment, and the telescopic platform comprises a supporting seat and a mobile station, the mobile station is movably arranged on the supporting seat, is used for bearing a projection host of the projection equipment, and can drive the projection host to move between an extension position and a retraction position; one of the supporting seat and the movable table is provided with a guide groove, the other one of the supporting seat and the movable table is provided with a sliding part set matched with the guide groove, the guide groove comprises a first guide wall and a second guide wall which are opposite, the sliding part set comprises a first sliding part and a second sliding part, the first sliding part abuts against the first guide wall, and a distance is formed between the first sliding part and the second guide wall; the second sliding piece abuts against the second guide wall, and a gap is formed between the second sliding piece and the first guide wall. The orthographic projection of the first sliding piece on the first plane is partially overlapped with the orthographic projection of the second sliding piece on the first plane. According to the telescopic platform provided by the embodiment of the invention, the requirement of a user on equipment miniaturization can be met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of laser TVs, and particularly to a telescopic platform and a projection device. Background Art

[0002] Currently, ultra-short throw projection devices such as laser TVs are applied in many occasions. A laser TV includes a projection host and a projection screen. Laser light is emitted from the projection host and projected onto the projection screen, and then enters the human eye through reflection by the projection screen for imaging. The projection ratio of a laser TV refers to the size of the largest and smallest pictures projected onto the projection screen at the same distance. Since a laser TV forms an image through reflection by the projection screen, the projection ratio of the projection host needs to match the screen. At the same time, during the use of a laser TV, users will adjust the positional relationship between the projection host and the projection screen according to their preferences to meet the requirements of different-sized projected pictures.

[0003] Generally, the projection host needs to be placed on a TV cabinet, but the depth of existing TV cabinets cannot meet the depth of the TV cabinet required by the projection ratio of the laser TV. Therefore, a telescopic platform is usually used to assist the projection host to reach the specified position. The existing telescopic platform includes a support base and a moving platform for carrying the projection host. The moving platform can telescopically move relative to the support base under the drive of a drive mechanism. After the projection host is placed on the moving platform, the laser projection device can reach the specified position by adjusting the telescopic length of the moving platform.

[0004] However, after the existing telescopic platform and the projection host are installed, the overall height is relatively high and the occupied space is large. Summary of the Invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a telescopic platform and a projection device.

[0006] In a first aspect, the present application discloses a telescopic platform applied to a projection device. The telescopic platform may include a support base and a moving platform. The moving platform is movably arranged on the support base, used for carrying the projection host of the projection device, and capable of driving the projection host to move between an extended position and a retracted position to adjust the distance between the projection host and the projection screen. One of the support base and the moving platform is provided with a guiding groove, and the other is provided with a sliding member group adapted to the guiding groove. The guiding groove includes opposite first guiding walls and second guiding walls. The sliding member group includes a first sliding member and a second sliding member. The first sliding member abuts against the first guiding wall and has a spacing from the second guiding wall. The second sliding member abuts against the second guiding wall and has a spacing from the first guiding wall. Wherein, the orthographic projection of the first sliding member on a 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 guiding groove.

[0007] In this way, in the present application, the orthographic projection of the first sliding member on the first plane overlaps partially with the orthographic projection of the second sliding member on the first plane, reducing the overall height of the mobile station, thereby reducing the overall height of the projection device, improving the overall aesthetic feeling of the device, and better meeting the user's requirements for miniaturization of the projection device.

[0008] In some embodiments of the present application, a first sliding groove is provided on the first guiding wall, and a part of the first sliding member extends into the first sliding groove and can slide along the extending direction of the first sliding groove.

[0009] In some embodiments of the present application, a first guiding groove is provided on the outer peripheral surface of the first sliding member, and a first guiding protrusion cooperating with the first guiding groove is provided on the first guiding wall.

[0010] In some embodiments of the present application, the cross-section of the first guiding groove can be formed into shapes such as semi-circular, elliptical, triangular, inverted trapezoidal, rectangular, etc.

[0011] In some embodiments of the present application, the first sliding member includes a first surface facing the bottom wall of the guiding groove, and the first guiding wall is provided with a first limiting protrusion, which is located between the first sliding member and the bottom wall of the guiding groove, and the first limiting protrusion abuts against the first surface.

[0012] In some embodiments of the present application, the number of the sliding member groups is multiple, and the multiple sliding member groups are arranged at intervals in the extending direction of the guiding groove.

[0013] In some embodiments of the present application, a driving motor and a transmission member are provided on the support base. The transmission member includes a lead screw and a nut in threaded cooperation. The extending direction of the lead screw is parallel to the extending direction of the guiding groove. One end of the lead screw is connected to the output shaft of the driving motor, and the nut is connected to the mobile station.

[0014] In some embodiments of the present application, the telescopic platform further includes: an adjusting bolt, which is used to connect with the fixing hole on the projection host to drive the projection host to move along the axial direction of the adjusting bolt by rotating the adjusting bolt. In a second aspect, the present application further provides a projection device, which includes a projection host, a projection screen, and the telescopic platform described in any of the above technical solutions. The projection host is carried on the mobile station of the telescopic platform, the projection port of the projection host faces the projection screen, and the mobile station drives the projection host to move towards or away from the projection screen.

[0015] In some embodiments of the present application, an avoidance groove is provided on the projection host. The avoidance groove is recessed from a part of the bottom wall of the projection host towards the direction away from the telescopic platform, and a part of the telescopic platform extends into the avoidance groove.

[0016] Among them, for the technical effects brought about by any of the design methods in the second aspect, reference can be made to the technical effects brought about by different design methods in the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the telescopic platform provided by some embodiments of the present application;

[0020] Figure 2 For Figure 1 Schematic diagram of the translation stage shown in

[0021] Figure 3 For Figure 1 Schematic diagram of the support base shown in

[0022] Figure 4 For Figure 3 Schematic diagram of the slider group shown in

[0023] Figure 5 Cross-sectional view of the telescopic platform provided by some embodiments of the present application;

[0024] Figure 6 For Figure 5 Enlarged view of part A shown in

[0025] Figure 7 Cross-sectional view of the telescopic platform provided by some other embodiments of the present application;

[0026] Figure 8 For Figure 7 Enlarged view of part B shown in

[0027] Figure 9 Cross-sectional view of the telescopic platform provided by some further embodiments of the present application;

[0028] Figure 10 For Figure 9 Enlarged view of part C shown in

[0029] Reference numerals:

[0030] 100, telescopic platform;

[0031] 110. Support base; 111. First support wall; 112. Second support wall; 113. Sliding member group; 1131. First sliding member; 1132. Second sliding member; 1133. First guiding groove; 1141. First groove surface; 1142. Second groove surface; 1143. First surface; 115. Driving motor; 116. Lead screw;

[0032] 120. Moving platform; 121. Platform; 122. First folding edge; 123. Second folding edge; 124. Guiding groove; 1241. First guiding wall; 1242. Second guiding wall; 1243. First sliding groove; 1244. First inner wall; 1245. Second inner wall; 1251. First guiding protrusion; 1252. First convex surface; 1253. Second convex surface; 1254. Second guiding protrusion; 126. First limiting protrusion; 127. Second limiting protrusion;

[0033] 130. Adjusting bolt. Detailed implementation manners

[0034] In order to more clearly understand the above - mentioned objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0035] Many specific details are set forth in the following description in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0037] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0038] In the description of the embodiments of the present application, the term "and / or" refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and / or" is a relationship describing the association between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in the present application generally indicates that the objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, "connected" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the components are connected to each other and the relative position relationship after connection remains unchanged. Additionally, the orientation terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only with reference to the direction of the attached drawings. Therefore, the orientation terms are used to better and more clearly illustrate and understand the embodiments of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element.

[0041] Currently, projection devices such as laser TVs are applied in many places. A projection device may include a projection host, a projection screen, and a telescopic platform. Laser light emitted from the projection host is projected onto the projection screen and then reflected by the projection screen and enters the human eye for imaging. Among them, projection screens can generally be divided into two categories: reflective and transmissive; reflective screens are used for front projection, and transmissive screens are used for rear projection; front projection screens can be further divided into flat screens and curved screens; flat screens can be divided into glass bead screens, metal screens, embossed plastic screens, elastic screens, etc. (embossed plastic screens can be divided into white plastic, gray plastic, silver plastic, etc.).

[0042] The projection ratio of a projection device refers to the sizes of the largest and smallest images projected onto a projection screen at the same distance. Since the projection device forms an image through reflection by the projection screen, the projection ratio of the projection host needs to match that of the projection screen. At the same time, during the use of the projection device, users will adjust the positional relationship between the projection host and the projection screen according to their preferences to meet projection screens of different sizes.

[0043] Generally, the projection host needs to be placed on a TV cabinet, but the depth of the existing TV cabinets cannot meet the depth of the TV cabinet required by the projection ratio of a laser TV. In related technologies, a telescopic platform is usually used to assist the projection host to reach a designated position. The telescopic platform in related technologies includes a support base and a moving platform for carrying the projection host. The moving platform can drive the projection host to move between an extended position and a retracted position to adjust the distance between the projection host and the projection screen.

[0044] In some embodiments of the present application, please refer to Figure 1 , one of the support base 110 and the moving platform 120 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 to say, the support base 110 may be provided with the guide groove 124 and the moving platform 120 may be provided with the sliding member group 113; or the support base 110 may be provided with the sliding member group 113 and the moving platform 120 may be provided with the guide groove 124.

[0045] Specifically, please refer to Figure 2 and Figure 3 , the moving platform 120 is formed into a U-shaped structure. The moving platform 120 includes a platform 121, a first folding edge 122 and a second folding edge 123. The first folding edge 122 and the second folding edge 123 are oppositely arranged and are located on both sides of the width direction of the platform 121. The guide groove 124 is located on the first folding edge 122 and the second folding edge 123. The moving platform 120 is sleeved on the support base 110. The support base 110 includes opposite first support walls 111 and second support walls 112. The first support wall 111 is oppositely arranged with the first folding edge 122, and the second support wall 112 is oppositely arranged with the second folding edge 123. The sliding member group 113 is provided on the first support wall 111 and the second support wall 112.

[0046] Among them, the structures of the first folding edge 122 and the second folding edge 123 are the same, and the structures of the first support wall 111 and the second support wall 112 are the same. Here, the guide groove 124 on the first folding edge 122 and the sliding member group 113 on the first support wall 111 are taken as examples for illustration.

[0047] The guiding groove 124 may include opposite first guiding wall 1241 and second guiding wall 1242. The sliding member group 113 may include a first sliding member 1131 and a second sliding member 1132. Specifically, the first sliding member 1131 and the second sliding member 1132 may be sliding wheels or sliding bearings. It should be noted that during the movement of the mobile station 120, the rotation directions of the first sliding member 1131 and the second sliding member 1132 are opposite. In some embodiments of the present application, the first sliding member 1131 abuts against the first guiding wall 1241 and has a spacing from the second guiding wall 1242; the second sliding member 1132 abuts against the second guiding wall 1242 and has a spacing from the first guiding wall 1241. In the height direction of the mobile station 120, the first sliding member 1131 and the second sliding member 1132 are relatively arranged, and the first sliding member 1131 and the second sliding member 1132 are spaced apart. This ensures the independent rotation of the first sliding member 1131 and the second sliding member 1132.

[0048] However, since the first sliding member 1131 and the second sliding member 1132 are relatively arranged in the height direction of the telescopic platform 100, taking the diameter of the first sliding member 1131 as D1 and the diameter of the second sliding member 1132 as D2 (D1 may be equal to D2) as an example, then the height occupied by the first sliding member 1131 and the second sliding member 1132 needs to be greater than D1 + D2, which restricts the height of the telescopic platform 100 from being further reduced, affecting the overall height and occupied space of the projection device and not meeting the user's requirement for device miniaturization.

[0049] To solve the above technical problems, please refer to Figure 3 and Figure 4 , the present application also provides a telescopic platform 100, wherein the orthographic projection of the first sliding member 1131 on the first plane overlaps partially with the orthographic projection of the second sliding member 1132 on the first plane, and the first plane is perpendicular to the extending direction of the guiding groove 124 (such as the front - rear direction shown in Figure 4 ).

[0050] 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 by the present application is less than D1 + D2, saving the space in the height of the telescopic platform 100. Therefore, the height of the telescopic platform 100 provided by the present application can be set lower, reducing the occupied space of the telescopic platform 100 and meeting the user's requirement for device miniaturization.

[0051] In some embodiments of the present application, please continue to refer to Figure 4, the first sliding member 1131 and the second sliding member 1132 are guide bearings with the same specifications. In the extending direction of the guide groove 124, the first sliding member 1131 and the second sliding member 1132 are arranged at intervals. The orthographic projection of the first sliding member 1131 on the first plane overlaps partially with the orthographic projection of the second sliding member 1132 on the first plane, and the first plane is perpendicular to the front-back direction. In this way, the space occupied by the sliding member group 113 in the height direction can be minimized to reduce the height of the telescopic pan-tilt head.

[0052] In some other embodiments of the present application, the first sliding member 1131 and the second sliding member 1132 are guide bearings with the same specifications. The orthographic projection of the first sliding member 1131 on the second plane overlaps partially with the orthographic projection of the second sliding member 1132 on the second plane, and the second plane is parallel to the extending direction of the guide groove 124; at the same time, the orthographic projection of the first sliding member 1131 on the first plane overlaps partially with the orthographic projection of the second sliding member 1132 on the first plane. In this way, the space occupied by the sliding member group 113 in the height direction can be reduced to a certain extent to reduce the height of the telescopic pan-tilt head 100.

[0053] In some embodiments of the present application, please refer to Figure 5 and Figure 6 , a first sliding groove 1243 is provided on the first guide wall 1241. A part of the first sliding member 1131 extends into the first sliding groove 1243 and can slide along the extending direction of the first sliding groove 1243. In this way, by providing the first sliding groove 1243 on the first guide wall 1241, the stability of the first sliding member 1131 during the sliding process can be further improved.

[0054] Specifically, the first sliding groove 1243 may include opposite first inner wall 1244 and second inner wall 1245. 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 providing the first sliding groove 1243, the movement of the first sliding member 1131 in its axial direction can be limited.

[0055] It can be understood that a second sliding groove may be provided on the second guide wall 1242. The second sliding groove is oppositely arranged with the first sliding groove 1243 in the up-down direction. A part of the second sliding member 1132 extends into the second sliding groove and can slide along the extending 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, and then the stability of the sliding member group 113 during the sliding process can be improved.

[0056] In some other embodiments of the present application, please refer to Figure 7 and Figure 8, a first guiding groove 1133 is provided on the outer peripheral surface of the first sliding member 1131, and a first guiding protrusion 1251 mating with the first guiding groove 1133 is provided on the first guiding wall 1241. Thus, through the mutually mating first guiding groove 1133 and first guiding protrusion 1251, the sliding of the first sliding member 1131 is limited, ensuring the stability of the first sliding member 1131 during the sliding process.

[0057] It should be noted that the first guiding protrusion 1251 includes opposite first convex surface 1252 and second convex surface 1253, and the first guiding groove 1133 may include opposite first groove surface 1141 and second groove surface 1142. Among them, the first convex surface 1252 faces the first groove surface 1141, and the second convex surface 1253 faces the second groove surface 1142. Thus, the limiting of the first guiding protrusion 1251 in the axial direction of the first sliding member 1131 is achieved, and further the stability of the first sliding member 1131 during the sliding process is ensured.

[0058] In some other embodiments, it may also be that a first guiding protrusion 1251 is provided on the outer peripheral surface of the first sliding member 1131, and a first guiding groove 1133 mating with the first guiding protrusion 1251 is provided on the first guiding wall 1241.

[0059] It can be understood that a second guiding groove is further provided on the outer peripheral surface of the second sliding member 1132, and a second guiding protrusion 1254 mating with the second guiding groove is provided on the second guiding wall 1242; or a second guiding protrusion 1254 is provided on the outer peripheral surface of the second sliding member 1132, and a second guiding groove mating with the second guiding protrusion 1254 is provided on the second guiding wall 1242. Thus, the limiting of the second guiding protrusion 1254 in the axial direction of the second sliding member 1132 is achieved, and further the stability of the second sliding member 1132 during the sliding process is ensured, and further the stability of the sliding member group 113 during the sliding process is ensured.

[0060] Furthermore, the cross-section of the first guiding groove 1133 may be formed into shapes such as a semicircle, an ellipse, a triangle, an inverted trapezoid, a rectangle, etc.

[0061] It can be understood that the cross-section of the first guiding protrusion 1251 needs to be formed into shapes such as a semicircle, an ellipse, a triangle, an inverted trapezoid, a rectangle, etc. that mate with the first guiding groove 1133.

[0062] When the cross-sections of the first guiding groove 1133 and the first guiding protrusion 1251 are formed into a triangular shape, the included angle between the first groove surface 1141 and the second groove surface 1142 may be 60°, 75°, 90°, etc.

[0063] In some embodiments of the present application, please continue to refer to Figure 7 and Figure 8, the first sliding member 1131 may include a first surface 1143 facing the bottom wall of the guiding groove 124. The first guiding 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 guiding groove 124, and the first limiting protrusion 126 abuts against the first surface 1143. It should be noted that in order to satisfy the relative sliding of the first sliding member 1131 relative to the first guiding wall 1241, a clearance fit is required between the first guiding groove 1133 and the first guiding protrusion 1251. In this way, setting the first limiting protrusion 126 can further prevent the first sliding member 1131 from wobbling in its axial direction, and further ensure the stability of the first sliding member 1131 during the sliding process.

[0064] It can be understood that the second sliding member 1132 may also include a second surface facing the bottom wall of the guiding groove 124. The second guiding 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 guiding groove 124, and the second limiting protrusion 127 abuts against the second surface. In this way, setting the second limiting protrusion 127 can further prevent the second sliding member 1132 from wobbling in its circumferential direction, and further ensure the stability of the second sliding member 1132 during the sliding process.

[0065] Among them, please refer to Figure 9 and Figure 10 , the first limiting protrusion 126 and the second limiting protrusion 127 may be formed integrally and formed into a U-shaped shape, and are arranged on the inner wall of the guiding groove 124. While playing a role in limiting the first sliding member 1131 and the second sliding member 1132, the thickness of the groove wall of the guiding groove 124 can be increased, and the strength of the first folded edge 122 can be increased.

[0066] In some embodiments of the present application, the number of the sliding member groups 113 is multiple, and the multiple sliding member groups 113 are arranged at intervals in the extending direction of the guiding groove 124. Thus, by arranging the multiple sliding member groups 113, the smoothness of the moving platform 120 and the supporting seat 110 during the moving process can be ensured.

[0067] Specifically, the number of the sliding member groups 113 may be three groups, four groups, five groups, six groups, etc.

[0068] Among them, the rated dynamic load Cr that a single bearing can withstand is 235N. Taking the example that one side of the telescopic cloud platform has five groups of sliding member groups, at least six guiding bearings of the telescopic cloud platform are loaded and stressed at any time, and can withstand a force of 1410N, so that the telescopic cloud platform can bear the weight of the projection host and the impact force in the direction of gravity after installing the projection host, and prevent the telescopic cloud platform from deforming and sinking.

[0069] In some embodiments of the present application, a driving motor 115 and a transmission member are further provided on the support base 110. The transmission member includes a lead screw 116 and a nut in threaded engagement. The extending direction of the lead screw 116 is parallel to the extending direction of the guiding groove 124. One end of the lead screw 116 is connected to the output shaft of the driving motor 115, and the nut is connected to the moving platform 120. In this way, the output shaft of the driving motor 115 drives the lead screw 116 to rotate. The threaded engagement between the nut and the lead screw 116 converts the rotation of the lead screw 116 into the translation of the nut in the axial direction of the lead screw 116, thereby driving the translation of the moving platform 120 relative to the support base 110.

[0070] The driving motor 115 of the present application can use the method of a 20-series stepper motor and a reduction box. While meeting the torque requirements, it can reduce the space occupied by the driving motor part in the up and down directions, and achieve the overall thinning of the telescopic pan-tilt head (compared with the 28-series stepper motor in the related art).

[0071] In some embodiments of the present application, the telescopic platform 100 may further include a controller. The controller is electrically connected to the driving motor 115. The controller can control the rotation direction of the output shaft of the driving motor 115, thereby controlling the reciprocating movement of the moving platform 120 relative to the support base 110 through the controller. The controller can also control the start and stop of the driving motor 115, thereby controlling the moving platform 120 to stop at the target position.

[0072] In some other embodiments, a first sensor and a second sensor may further be provided on the support base 110. The first sensor is used to detect whether the moving platform 120 returns to the retracted position. When the first sensor detects that the moving platform 120 returns to the retracted position, it transmits an instruction to stop the driving motor 115 to the controller. The second sensor is used to detect whether the moving platform 120 reaches the maximum extended position. When the second sensor detects that the moving platform 120 reaches the maximum extended position, it transmits an instruction to stop the driving motor 115 to the controller. Thus, it is possible to avoid the translation stroke of the nut exceeding the preset stroke, and avoid the phenomenon that the components between the moving platform 120 and the support base 110 are damaged due to extrusion or pulling.

[0073] In some embodiments of the present application, the telescopic platform 100 may further include: an adjusting bolt 130. The projection host is provided with a fixing hole for wall mounting. The adjusting bolt 130 is used to connect with the fixing hole on the projection host, so as to drive the projection host to move along the axial direction of the adjusting bolt 130 by rotating the adjusting bolt 130.

[0074] Specifically, an adjusting hole may be provided on the moving platform 120. The adjusting bolt 130 is disposed on the moving platform 120. One end of the adjusting bolt 130 is used for threaded connection with the fixing hole of the projection host, and the other end is inserted into the adjusting hole.

[0075] Among them, the adjustment hole can be selected as a through hole on the mobile station 120, the adjustment hole can be selected as an oblong hole extending in a direction parallel to the mobile station 120, or the adjustment hole can be selected as a rectangular through hole. The adjustment bolt 130 can move in the adjustment hole, so that the position of the adjustment bolt 130 on the mobile station 120 can be adjusted, enabling the adjustment bolt 130 to adapt to projection hosts of different sizes.

[0076] The number of the above-mentioned adjustment bolts 130 and adjustment holes can be selected as multiple. The multiple adjustment holes can be selected to be arranged at intervals on the mobile station 120. The number of adjustment bolts 130 can be selected to be equal to the number of adjustment holes, so that each adjustment hole is provided with an adjustment bolt 130. Of course, the number of adjustment bolts 130 can also be selected to be less than the number of adjustment holes. For example, the number of adjustment holes is selected to be ten, and the number of adjustment bolts 130 is two. The two adjustment bolts 130 can be respectively connected to two of the ten adjustment holes.

[0077] In some embodiments of the present application, the projection host provided by the present application is provided with an avoidance groove. The avoidance groove is recessed from a part of the bottom wall of the projection host in a direction away from the telescopic platform 100, and a part of the telescopic platform 100 extends into the avoidance groove. In this way, when the internal space of the projection host permits, setting the avoidance groove can further reduce the overall height of the projection host and the telescopic platform 100, and further reduce the space occupation ratio of the projection host and the telescopic platform 100, which better meets the user's requirement for equipment miniaturization.

[0078] In the specific implementation process, through the combination of the avoidance groove and the sliding member group in the above embodiment, the product thickness of the telescopic cloud platform can be reduced by 40.5%, and the overall thickness after installation with the laser host can be reduced by 59%.

[0079] The above are only specific implementation manners of the present disclosure, which enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A telescopic platform applied to a projection device, characterized in that, Comprising: Support base; A mobile stage, which is movably arranged on the support base and is used to carry the projection host of the projection device, and can drive the projection host to move between a protruding position and a retracted position so as to adjust the distance between the projection host and the projection screen; One of the support base and the mobile stage is provided with a guiding groove, and the other is provided with a sliding member group adapted to the guiding groove. The guiding groove includes opposite first guiding wall and second guiding wall. The sliding member group includes a first sliding member and a second sliding member. The first sliding member abuts against the first guiding wall and has a spacing from the second guiding wall. The second sliding member abuts against the second guiding wall and has a spacing from the first guiding wall; Wherein, 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 guiding groove.

2. The telescopic platform according to claim 1, characterized in that, A first sliding groove is provided on the first guiding wall, and a part of the first sliding member extends into the first sliding groove and can slide along the extending direction of the first sliding groove.

3. The telescopic platform according to claim 1, wherein A first guiding groove is provided on the outer peripheral surface of the first sliding member, and a first guiding protrusion adapted to the first guiding groove is provided on the first guiding wall.

4. The telescopic platform according to claim 3, characterized in that, The cross section of the first guiding groove is formed into a semi-circular shape or a triangular shape.

5. The telescopic platform according to claim 1, characterized in that, The first sliding member includes a first surface facing the bottom wall of the guiding groove. The first guiding wall is provided with a first limiting protrusion, which is located between the first sliding member and the bottom wall of the guiding groove, and the first limiting protrusion abuts against the first surface.

6. The telescopic platform according to claim 1, wherein, The number of the sliding member groups is multiple, and the multiple sliding member groups are arranged at intervals in the extending direction of the guiding groove.

7. The telescopic platform according to claim 1, characterized in that A driving motor and a transmission member are provided on the support base. The transmission member includes a lead screw and a nut in threaded cooperation. The extending direction of the lead screw is parallel to the extending direction of the guiding groove. One end of the lead screw is connected to the output shaft of the driving motor, and the nut is connected to the mobile stage.

8. The telescopic platform according to claim 1, wherein Further comprising: An adjusting bolt, which is used to connect with the fixing hole on the projection host so as to drive the projection host to move along the axial direction of the adjusting bolt by rotating the adjusting bolt.

9. A projection device, characterized in that, Comprising: A projection host, a projection screen and a telescopic platform according to any one of claims 1 to 8. The projection host is carried on the mobile stage of the telescopic platform. The projection port of the projection host faces the projection screen, and the mobile stage drives the projection host to move towards or away from the projection screen.

10. The projection device according to claim 9, wherein An avoidance groove is provided on the projection host. The avoidance groove is recessed from a part of the bottom wall of the projection host towards a direction away from the telescopic platform, and a part of the telescopic platform extends into the avoidance groove.

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