Ultra-short-focus lens

Abstract

The utility model belongs to the technical field of projection lenses, and discloses an ultra-short-focus lens, which comprises a shell connected with the lens, and a turning module, a reflection bowl module and a light outlet are sequentially arranged on an emergent light path of the lens on the shell; the turning module is adjustably connected to the shell, and the reflection bowl module is adjustably connected to the shell. According to the utility model, rapid angle adjustment between the turning module and / or the reflection bowl module and the shell can be realized in the assembly process, so that specific use requirements are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of projection lenses, and in particular relates to an ultra-short focal length lens. Background Art

[0002] With the continuous development and advancement of optical projection technology, projectors are being used in more and more scenarios, and users have higher and higher requirements for the quality of projected images.

[0003] Usually, a projection lens generally includes an imaging module and a reflection bowl module. The imaging module emits light, which is projected out of the projector through the reflection bowl module, so that the light forms an image on a screen or a wall. In some other existing technologies, a turning module is also configured to shorten the projection distance of the projector.

[0004] However, in the prior art, the adjustment structures of the reflection angle and / or the turning angle are respectively installed on different brackets, which has the defects of complex structure, inconvenient assembly and large installation tolerance. Utility Model Content

[0005] In order to solve the above technical problems, the utility model discloses an ultra-short focus lens, which can realize rapid angle adjustment between the turning module and / or the reflection bowl module and the shell during the assembly process, thereby meeting specific usage requirements.

[0006] The specific technical solution of the utility model is as follows:

[0007] An ultra-short-throw lens, comprising:

[0008] A housing connected to the lens, wherein a turning module, a reflection bowl module and a light outlet are sequentially arranged on the housing on the outgoing light path of the lens;

[0009] Wherein, the turning module is adjustably connected to the shell, and / or the reflecting bowl module is adjustably connected to the shell.

[0010] When the angle between the turning module and the shell is adjustable, and the angle between the reflecting bowl module and the shell is adjustable, the optical path can be debugged during the assembly process, and the relative positions of the turning module, the reflecting bowl module and the shell can be fixed, so that the light emitted by the lens is emitted from the shell along the preset optical path, thereby meeting the user's usage requirements.

[0011] Preferably, the transition module is provided with a rotating part and a fixed part, the transition module is rotatably connected to the shell via the rotating part, and the fixed part is connected to the shell via an adjustable component 1 to rotationally adjust the transition module relative to the shell.

[0012] The turning module can swing along the axis of the rotating part to achieve angle adjustment between the turning module and the shell. After the adjustment is completed, the adjustable component is used to connect the fixed part and the shell to maintain the relative position between the turning module and the shell.

[0013] Preferably, the adjustable component 1 comprises:

[0014] A first limiting member, wherein the first limiting member is movably and adjustably connected to the housing; and

[0015] The elastic member 1 is arranged between the transition module and the shell so that the transition module elastically abuts against the limiting member 1.

[0016] The elastic member 1 can provide a continuous and stable pre-tightening force, thereby ensuring improved connection tightness and preventing loosening. In addition, the structure can also compensate for assembly tolerances during installation to ensure tightness and reliability of the connection.

[0017] Preferably, the housing is provided with a positioning groove for matching the rotating part;

[0018] The shell is connected with an elastic sheet, one end of which is clamped with the shell, and the other end is detachably connected with the shell through a second limiting member, and the rotating part is limited to rotate between the elastic sheet and the positioning groove.

[0019] The structure is simple and can easily realize the rapid assembly and disassembly of the turning module and the shell, which can effectively improve the assembly efficiency and on this basis well meet the limit rotation requirements of the turning module.

[0020] Preferably, the reflective bowl module is provided with a ball head;

[0021] The shell is provided with a ball head groove matched with the ball head, and the reflective bowl module is connected to the shell through an adjustable component 2 so as to adjust the reflective bowl module in multiple directions relative to the shell.

[0022] The reflective bowl module is movably connected to the shell through the ball head to achieve the purpose of multi-directional angle adjustment. After the adjustment is completed, the reflective bowl module and the shell are connected using adjustable component 2 so that the reflective bowl module and the shell maintain the adjusted relative angle, thereby achieving the purpose of optical path adjustment.

[0023] Preferably, the housing is provided with a concave mounting portion, and a ball head groove for matching the ball head is provided in the mounting portion;

[0024] The reflective bowl module has a pressing piece, which is connected to the mouth of the mounting portion of the shell, and the pressing piece is in point contact or surface contact with the ball head.

[0025] The ball head is arranged in the mounting portion, and the ball head and the ball head groove cooperate with each other. At this time, the ball head is also pressed by the pressing piece, and the two are in point contact or surface contact. At this time, the angle adjustment of the reflective bowl module can be easily achieved. Under the premise of no external force, the reflective bowl module can also maintain the relative angle with the shell. That is to say, the setting of the pressing piece not only does not affect the angle adjustment of the reflective bowl module, but also can stabilize the adjusted state. Therefore, when the adjustable component 2 is used to further determine the relative position between the reflective bowl module and the shell, it has better stability.

[0026] Preferably, the end of the reflective bowl module away from the ball head is further provided with a cylindrical portion;

[0027] The shell is provided with a plate body 1 and a plate body 2 separated from each other, and the cylindrical portion is located between the plate body 1 and the plate body 2.

[0028] There is a gap between plate body one and plate body two, and the gap provides a movement path for the cylindrical part. That is to say, when the reflective bowl module adjusts the relative angle between the reflective bowl module and the shell through the ball head, the relative position between the cylindrical part and the above-mentioned gap may change accordingly. At this time, if the relative position between the cylindrical part and the shell does not change, the ball head cannot achieve the corresponding angle adjustment. Therefore, the adjustment space is reserved by plate body one and plate body two, which effectively widens the adjustment range of the optical path.

[0029] Preferably, the adjusting member comprises:

[0030] A second stopper connected between the reflective bowl module and the housing; and

[0031] The second elastic member is sleeved on the outer side of the second limiting member.

[0032] The adjustment component can adapt itself according to the actual angle adjustment situation to ensure that the adjustment angle between the reflective bowl module and the shell is stable. The elastic member 2 can provide a continuous and stable pre-tightening force, thereby ensuring improved connection tightness and preventing loosening. In addition, the structure can also compensate for assembly tolerances during installation to ensure the tightness and reliability of the connection.

[0033] Preferably, the shell wall is provided with through openings for installing the turning module and the reflecting bowl module respectively, and the through openings are detachably connected with a cover plate.

[0034] The structure is simple and can facilitate disassembly and assembly of the turning module and the reflective bowl module, thereby improving the efficiency of the disassembly and assembly process. The provision of the cover plate can also protect the components inside the shell.

[0035] Preferably, an adjustment window is provided on the cover plate.

[0036] The adjustment window can achieve angle adjustment of the turning module and / or the reflection bowl module without removing the cover plate, thereby making it easier to adjust the optical path.

[0037] Compared with the prior art, in the utility model, the turning module and the reflection bowl module are adjustably connected on the same shell, which has the advantages of stable and compact assembly and small tolerance; the utility model can realize ultra-short-focus projection, and during the assembly process, the optical path adjustment is realized to meet the user's use requirements for projection; the optical path adjustment structure of the utility model during the assembly process is simple and practical, which well realizes the optimization of the assembly process and improves the efficiency of the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of an embodiment of the utility model;

[0039] Figure 2 for Figure 1 A schematic diagram of another direction;

[0040] Figure 3 This is a schematic diagram of the assembly of the turning module in the embodiment of the utility model;

[0041] Figure 4 for Figure 3 A magnified image of point A;

[0042] Figure 5 for Figure 1 A top view of some parts of the

[0043] Figure 6 for Figure 5 BB cross-sectional view;

[0044] Figure 7 for Figure 5 CC cross-sectional view.

[0045] In the figure: 1-lens; 2-shell; 3-turning module; 4-reflection bowl module; 5-rotating part; 6-fixing part; 7-limiting member 1; 8-elastic member 1; 9-positioning groove; 10-spring; 11-bayonet; 12-notch groove; 13-ball head; 14-pressing piece; 15-cylindrical part; 16-plate body 1; 17-plate body 2; 18-limiting member 2; 19-elastic member 2; 20-cover plate 1; 21-cover plate 2; 22-adjusting window; 23-light-emitting glass. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0047] like Figure 1 to Figure 7As shown, an ultra-short focus lens comprises a shell 2 connected to a lens 1, and a turning module 3, a reflection bowl module 4 and a light outlet are sequentially arranged on the shell 2 on the outgoing light path of the lens 1; the turning module 3 is adjustably connected to the shell 2, and / or the reflection bowl module 4 is adjustably connected to the shell 2.

[0048] For some home projectors, they are generally placed far away from the screen or wall to provide the projector with an appropriate projection distance, so that users can have a better user experience. Such a placement is actually easily blocked by the user and affects the projection screen. Therefore, if the projector can be placed close to the screen or wall, the projector is located between the projection screen and the user, so that the user will hardly affect the projection screen. Therefore, in this embodiment, the light path is extended by the turning module 3 and the reflection bowl module 4, so that the projector can achieve ultra-short focus projection in a vertical manner. On this basis, in this embodiment, the light path can also be changed by adjusting the angle between the turning module 3 and the housing 2, as well as the angle between the reflection bowl module 4 and the housing 2, to achieve the purpose of assembly and debugging, thereby achieving necessary operations such as collimation. Of course, it is known that in some other embodiments, the projector can also select an adjustment module between the turning module 3 and the reflection bowl module 4, that is, the angle between one of the turning module 3 and the reflection bowl module 4 and the housing 2 is adjustable, and the other is fixedly connected to the housing 2. Therefore, in order to improve assembly efficiency and better meet the user's experience, in this embodiment, both the turning module 3 and the reflection bowl module 4 can achieve angle adjustment with the housing 2. In this embodiment, the light outlet is provided with a light outlet glass 23.

[0049] like Figure 3 , Figure 4 , Figure 6 As shown, in this embodiment, the transition module 3 is provided with a rotating part 5 and a fixed part 6, the transition module 3 is rotatably connected to the housing 2 via the rotating part 5, and the fixed part 6 is connected to the housing 2 via an adjustable member 1 to rotate and adjust the transition module 3 relative to the housing 2. Figure 2 and Figure 3As shown, a rotating part 5 is protruded at the left and right ends of the turning module 3, and the rotating part 5 is columnar, so that the turning module 3 can rotate along the axis of the rotating part 5; a fixed part 6 is set at the middle position of the bottom of the turning module 3, and after the position adjustment of the turning module 3 is completed, the fixing part 6 and the housing 2 are connected by an adjustable member 1, so as to achieve the angle adjustment between the turning module 3 and the housing 2. It can be seen that a turning mirror is equipped on the turning module 3, so that the position adjustment of the turning mirror can be achieved by adjusting the turning module 3, thereby changing the turning optical path of the light at the turning mirror. At the same time, it can be seen that since the rotating part 5 of the turning module 3 is located at both ends thereof, the rotating shaft module can achieve pitch adjustment, thereby also meeting the collimation adjustment. Further, the adjustable member 1 includes a limiter 17 and an elastic member 18; the limiter 17 is movably and adjustably connected to the housing 2; the elastic member 18 is arranged between the turning module 3 and the housing 2 so that the turning module 3 elastically abuts against the limiter 17. Therefore, on the basis of pre-tightening the turning module 3, the angle adjustment requirement between the rotating shaft module and the housing 2 is met.

[0050] In this embodiment, the housing 2 is provided with a positioning groove 9 for matching the rotating part 5; the housing 2 is connected with a spring sheet 10, one end of which is engaged with the housing 2, and the other end is detachably connected to the housing 2 through a second limiting member 18, and the rotating part 5 is limited to rotate between the spring sheet 10 and the positioning groove 9. The housing 2 is provided with a positioning groove 9, and during assembly, the rotating part 5 is placed in the positioning groove 9, so that the rotation of the rotating part 5 is located in the positioning groove 9. In order to limit the rotation space, the positioning groove 9 is semi-closed by the spring sheet 10, which means that the spring sheet 10 is placed at the mouth of the positioning groove 9 to limit the radial movement of the turning module 3 along the rotating part 5. Specifically, the spring piece 10 is a bent structure, and a bayonet 11 is provided on one side of the positioning groove 9. One end of the spring piece 10 extends into the bayonet 11 for clamping, and the other end is connected to the housing 2 by a screw. The spring piece 10 forms an arched space on the upper side of the positioning groove 9, which meets the rotation requirements of the rotating part 5 while meeting the assembly requirements of the rotating part 5.

[0051] It should be noted that, in this embodiment, the outer surface of the rotating part 5 is provided with a plurality of notched grooves 12 along its axial direction. The turning module 3 in this embodiment is a plastic part, and thus its volume or weight can be reduced by technical means, and its performance can be maintained or improved. In other words, the notched grooves 12 reduce the volume and weight of the rotating part 5, and at the same time maintain the performance and accuracy of the rotating part 5, thereby well meeting the angle adjustment requirements between the turning module 3 and the housing 2.

[0052] like Figure 6 and Figure 7As shown, in this embodiment, the reflective bowl module 4 is provided with a ball head 13; the shell 2 is provided with a ball head slot that matches the ball head 13, and the reflective bowl module 4 is connected to the shell 2 through an adjustable component 2 to adjust the reflective bowl module 4 in multiple directions relative to the shell 2. In order to meet the requirements of multi-directional adjustment of the reflective bowl module 4, the reflective bowl module 4 is matched with the ball head 13 and the ball head slot so that the reflective bowl module 4 can be adjusted in multiple directions relative to the shell 2. In this embodiment, the ball head 13 includes a ball head 1 and a ball head 2 respectively arranged on both sides of the reflective bowl module 4, and the ball head 1 and the ball head 2 can achieve surface contact and / or point contact, so it is more suitable for angle adjustment. Further, the shell 2 is provided with a concave mounting portion, and a ball head slot for matching the ball head 13 is provided in the mounting portion; the reflective bowl module 4 has a pressing sheet 14, and the pressing sheet 14 is connected to the mouth of the mounting portion of the shell 2, and the pressing sheet 14 is in point contact or surface contact with the ball head 13. In order to simplify the structure of the pressing sheet 14 , in this embodiment, the pressing sheet 14 contacts the ball head 13 at a point. Specifically, in the present embodiment, the ball head 1 is located on the inner side of the reflective bowl module 4, and the ball head 2 is located on the outer side of the reflective bowl module 4, the ball head 1 cooperates with the ball head groove, and the ball head 2 cooperates with the pressing plate 14, that is, when the pressing plate 14 cooperates with the ball head 13, the ball head 1 is in surface contact with the ball head groove, and the ball head 2 is in point contact with the pressing plate 14, so during the adjustment process, the reflective bowl module 4 can achieve multi-directional angle deflection through the ball head 13 to meet the optical path adjustment requirements, but after multi-directional adjustment, it is also necessary to position the reflective bowl module 4 to avoid relative displacement with the shell 2 after adjusting the angle, therefore, in order to ensure position stability, it is also necessary to limit the adjustment method through the shell 2, therefore, in the present embodiment, the reflective bowl module 4 is further provided with a cylindrical portion 15 at one end away from the ball head 13; the shell 2 is provided with a spaced plate 16 and a plate 2 17, and the cylindrical portion 15 is located between the plate 16 and the plate 2 17. Specifically, there is a straight channel between the plate body 16 and the plate body 2 17. When the angle is adjusted by the ball head 13, the displacement change of the cylindrical part 15 is only performed within the above-mentioned straight channel. That is to say, the plate body 16 and the plate body 2 17 provide two adjustment paths for the reflective bowl module 4, one is the left and right swing along the axis of the cylindrical part 15, and the other is the up and down pitch along the cross-section of the optical path. Therefore, on the basis of ensuring the realization of the optical path adjustment, the connection stability and adjustment stability requirements between the adjusted reflective bowl module 4 and the shell 2 can be well met.

[0053] In the present embodiment, the adjustable component 2 includes a limit member 2 18 connected between the reflective bowl module 4 and the shell 2, and an elastic member 2 19; the elastic member 2 19 is sleeved on the outside of the limit member 2 18. It should be noted that in the present embodiment, the limit member 1 7 and the limit member 2 18 are both screws or bolts, which makes the detachable method simple and has an efficient assembly process. It is known that when the reflective bowl module 4 is swung left and right for adjustment, the limit members 2 18 on both sides of the reflective bowl module 4 have different screw-in depths. For example, if it is swung to the left, the screw-in depth of the limit member 2 18 on the left side is shallower than the screw-in depth of the limit member 2 18 on the right side. At this time, the elastic member 2 19 can maintain sufficient preload force.

[0054] Therefore, through the lens 1 provided in this embodiment, the optical path can be adjusted during the assembly process to meet the user's usage requirements and achieve the advantages of small assembly tolerance and good performance of the lens 1.

[0055] like Figure 1 and Figure 2 As shown, in this embodiment, the wall surface of the shell 2 is provided with a through-portion for installing the turning module 3 and the reflecting bowl module 4, and the through-portion is detachably connected with a cover plate. When the turning module 3 and the reflecting bowl module 4 are disassembled, the cover plate is opened, and the corresponding installation can be performed at the through-portion. It can be known that the through-portions in this embodiment are through-portion 1 and through-portion 2, respectively. The through-portion 1 is used to install and disassemble the turning module 3, and the through-portion 2 is used to install and disassemble the reflecting bowl module 4. The through-portion 1 and the through-portion 2 have a cover plate 1 20 and a cover plate 2 21, respectively. Specifically, taking installation as an example, open the cover plate 1 20, adjust the position of the rotating part 5 in the positioning groove 9, and then realize the positioning and assembly of the fixing part 6, and then cover the cover plate 1 20; open the cover plate 2 21, use the ball head 13 to connect the ball head groove, and place the cylindrical part 15 between the plate body 1 16 and the plate body 2 17. After the adjustment is completed, use the adjustable component 2 to pre-tighten, and then cover the cover plate 2 21. Further, in order to more conveniently achieve angle adjustment, an adjustment window 22 is provided on the cover plate. Specifically, in this embodiment, two adjustment windows 22 are opened at the cover plate 2 21, which correspond to the two adjustable components 2 connected to the reflection bowl module 4. By twisting the limiter 2 18, the reflection bowl module 4 can be adjusted in angle through the depth of the spiral limiter 2 18. At this time, the adjustment requirements can be met under the action of the elastic member 2 19, and the operation is more convenient and quick, and there is no need to open the cover plate 2 21. It can be known that this structure can also be used to adjust the turning module 3.

[0056] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An ultra-short focal length lens, characterized in that: include: A housing connected to the lens, wherein a turning module, a reflection bowl module and a light outlet are sequentially arranged on the housing on the outgoing light path of the lens; Wherein, the turning module is adjustably connected to the shell, and / or the reflecting bowl module is adjustably connected to the shell.

2. The ultra-short focus lens according to claim 1, characterized in that: The transition module is provided with a rotating part and a fixed part. The transition module is rotatably connected to the shell through the rotating part. The fixed part is connected to the shell through an adjustable component 1 to rotate and adjust the transition module relative to the shell.

3. An ultra-short focus lens as claimed in claim 2, characterized in that: The adjustable component 1 comprises: A first limiting member, wherein the first limiting member is movably and adjustably connected to the housing; and The elastic member 1 is arranged between the transition module and the shell so that the transition module elastically abuts against the limiting member 1.

4. The ultra-short focus lens according to claim 2, characterized in that: The housing is provided with a positioning groove for matching the rotating part; The shell is connected with an elastic sheet, one end of which is clamped with the shell, and the other end is detachably connected with the shell through a second limiting member, and the rotating part is limited to rotate between the elastic sheet and the positioning groove.

5. The ultra-short focal length lens according to claim 1, wherein: The reflective bowl module is provided with a ball head; The shell is provided with a ball head groove matched with the ball head, and the reflective bowl module is connected to the shell through an adjustable component 2 so as to adjust the reflective bowl module in multiple directions relative to the shell.

6. The ultra-short focus lens according to claim 5, characterized in that: The housing is provided with a concave mounting portion, and a ball head groove for matching the ball head is provided in the mounting portion; The reflective bowl module has a pressing piece, which is connected to the mouth of the mounting portion of the shell, and the pressing piece is in point contact or surface contact with the ball head.

7. The ultra-short focal length lens according to claim 5, wherein: The reflective bowl module is further provided with a cylindrical portion at one end away from the ball head; The shell is provided with a plate body 1 and a plate body 2 separated from each other, and the cylindrical portion is located between the plate body 1 and the plate body 2.

8. The ultra-short focus lens according to claim 5, characterized in that: The second adjustable component comprises: A second stopper connected between the reflective bowl module and the housing; and The second elastic member is sleeved on the outer side of the second limiting member.

9. The ultra-short focal length lens according to claim 1, wherein: The shell wall is provided with through openings for installing the turning module and the reflecting bowl module respectively, and the through openings are detachably connected with a cover plate.

10. The ultra-short focal length lens according to claim 9, wherein: The cover plate is provided with an adjustment window.

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