Lens tilt-shift mechanism

Abstract

The utility model relates to the technical field of optical projection, in particular to a lens tilt-shift mechanism, which comprises a bearing assembly, a second bearing assembly and a third bearing assembly, the bearing assembly comprises a base and a first bearing part, and the first bearing part is positioned above the base and is connected with the base through a first sliding guide part; the driving assembly comprises a first driving part which is arranged on the base and matched with the first sliding guide part to drive the first bearing part to move, the first driving part comprises a first worm rotationally arranged on the base and a driving motor fixed to the base, and the first worm and the driving motor are connected through a connecting shaft part; the first transmission rack is arranged on one side of the first bearing part and is meshed with the first worm; through the arrangement, the position adjustment of the lens relative to the ray machine is realized, the space utilization rate is optimized, the operation stability is ensured, and the structural complexity and the production cost are effectively reduced on the premise of meeting the high-resolution projection requirement.

Description

Technical Field

[0001] This utility model relates to a lens shift mechanism and belongs to the field of optical projection technology. Background Technology

[0002] Projectors are widely used in homes, offices, and other settings, and users are increasingly demanding higher performance and functionality from them. Currently, the common method for moving the projected image is to move the entire projector or adjust the position of the optical engine and lens. However, current methods suffer from problems such as complex structure, high cost, large space requirements, poor operational stability, and image shifting due to vibration during use. Therefore, there is an urgent need for a new type of lens-shift mechanism to meet the demands of image movement in high-resolution projection scenarios. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a lens shift mechanism.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A lens shift mechanism, comprising: a support component, including a base and a first support member, wherein the first support member is located above the base and the two are connected by a first sliding guide portion;

[0005] The drive assembly includes a first drive unit disposed on the base and cooperating with the first sliding guide to drive the first carrier to move. The first drive unit includes a first worm gear rotatably disposed on the base and a drive motor fixed on the base. The first worm gear and the drive motor are connected by a coupling. The assembly also includes a first transmission rack disposed on one side of the first carrier and meshing with the first worm gear.

[0006] Furthermore, it also includes a second carrier, a second sliding guide, and a second driving part. The second carrier is located above the first carrier and the two are connected by the second sliding guide. The length extension direction of the first sliding guide is perpendicular to the length extension direction of the second sliding guide. The second driving part is disposed on the first carrier and cooperates with the second sliding guide to drive the second carrier to move.

[0007] Furthermore, the second drive unit includes a second worm gear rotatably mounted on the first support member and a drive motor fixed on the first support member. The second worm gear and the drive motor are connected by a coupling. It also includes a second transmission rack disposed on one side of the second support member and meshing with the second worm gear.

[0008] Furthermore, the coupling part includes a first coupling gear, one end of which is provided with meshing teeth and meshes with a second coupling gear provided at the end of the first worm and / or the second worm. The other end of the first coupling gear has an insertion groove adapted to the cross-sectional shape of the output shaft of the drive motor. When the output shaft of the drive motor is inserted into the insertion groove and is in normal transmission, there is a predetermined distance between the end of the output shaft and the bottom of the insertion groove. An elastic element is provided between the first coupling gear and the drive motor, and the elastic element has a preload.

[0009] Furthermore, a limiting post is coaxially provided at one end of the first coupling gear with meshing teeth, and a limiting groove is provided at the end of the second coupling gear for the limiting post to be inserted.

[0010] Alternatively, a limiting post may be coaxially provided at the end of the second coupling gear, and a limiting groove may be provided at the end of the first coupling gear with meshing teeth for the limiting post to be inserted.

[0011] Furthermore, the first sliding guide portion includes a sliding block disposed on the side of the first bearing member, a guide rod passing through the sliding block, and the two ends of the guide rod being connected and fixed in the mounting groove provided on the base by fasteners;

[0012] Alternatively, the second sliding guide portion includes a sliding block disposed on the side of the second carrier member, a guide rod passing through the sliding block, and the two ends of the guide rod being connected and fixed in the mounting groove provided on the first carrier member by fasteners.

[0013] Furthermore, the first bearing member has a first sliding guide on each of its opposite sides. The axial direction of the first worm is parallel to the length extension direction of the first sliding guide. The first transmission rack is disposed on the side of the sliding block near the first sliding guide of the first worm. When in the initial position, the center of the meshing area between the first worm and the first transmission rack is located on the perpendicular bisector of the line connecting the two extreme positions of the first transmission rack. The initial position is the position where the optical axis of the lens coincides with the optical axis of the light emitted from the optical valve of the optical engine.

[0014] Furthermore, the second bearing member has a second sliding guide on each of its opposite sides. The axial direction of the second worm is parallel to the length extension direction of the second sliding guide. The second transmission rack is located on the sliding block side near the second sliding guide of the second worm. When in the initial position, the center of the meshing area between the second worm and the second transmission rack is located on the perpendicular bisector of the line connecting the two extreme positions of the second transmission rack. The initial position is the position where the optical axis of the lens coincides with the optical axis of the light emitted from the optical valve of the optical engine.

[0015] Furthermore, the meshing area between the first worm and the first transmission rack is located in the middle region of the first transmission rack.

[0016] Furthermore, the fastener is a spring clip, which is detachably connected to the mounting groove and at least partially abuts against the top of the guide rod, and the top of the mounting groove is shaped to cooperate with the limiting action of the spring clip.

[0017] Furthermore, the radial fit clearance between the guide rod closer to the first worm and the mounting groove is smaller than the radial fit clearance between the guide rod farther from the first worm and the mounting groove.

[0018] Furthermore, the radial fit clearance between the guide rod closer to the second worm and the mounting groove is smaller than the radial fit clearance between the guide rod farther from the second worm and the mounting groove.

[0019] The beneficial effects of this utility model are:

[0020] First, the above settings allow for adjustment of the lens position relative to the optical engine, thereby enabling the movement and adjustment of the projected image. Second, while ensuring movement and adjustment, the layered layout optimizes space utilization and reduces space occupation. Finally, due to the self-locking characteristic of the worm gear, it effectively avoids the problem of projected image jumps during movement and adjustment, and also ensures that the mechanism described in this application is in a displacement-locked state after movement and adjustment. Compared with other adjustment methods, it can effectively avoid image shift caused by vibration during use. Through the above settings, this application can solve the above problems without setting other locking mechanisms, effectively reducing structural complexity and production costs while meeting the requirements of high-resolution projection. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the lens shift mechanism provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a front view of the lens shift mechanism provided in Embodiment 1 of this utility model;

[0023] Figure 3 This is a partial three-dimensional structural diagram of the first sliding guide part cooperating with the first driving part provided in Embodiment 1 of this utility model;

[0024] Figure 4 This is a front view of the first drive unit provided in Embodiment 1 of this utility model;

[0025] Figure 5 This is a front-view three-dimensional structural diagram of one of the shapes of the first coupling gear provided in Embodiment 1 of this utility model;

[0026] Figure 6 This is a rear-view three-dimensional structural diagram of one of the shapes of the first coupling gear provided in Embodiment 1 of this utility model.

[0027] Figure 7 This is a three-dimensional structural diagram of the first worm or the second worm provided in Embodiment 1 of this utility model.

[0028] Reference numerals: 1. Base; 2. First bearing member; 3. Second bearing member; 4. First sliding guide; 5. Second sliding guide; 6. First drive unit; 61. First worm gear; 62. Drive motor; 63. First transmission rack; 7. Second drive unit; 71. Second worm gear; 72. Second transmission rack; 8. Motor connecting seat; 9. Coupling part; 91. First coupling gear; 911. Limiting post; 912. Insertion groove; 92. Second coupling gear; 921. Limiting groove; 94. Elastic element; 10. Sliding block; 11. Guide rod; 12. Fastener; 13. Mounting groove. Detailed Implementation

[0029] The specific embodiments of this utility model are described in detail below. This utility model can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the scope of this invention.

[0031] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Example 1:

[0034] This utility model provides a lens shift mechanism and a support component, including a base 1 and a first support member 2, wherein the first support member 2 is located above the base 1 and the two are connected by a first sliding guide part 4;

[0035] The drive assembly includes a first drive unit 6 disposed on the base 1 and cooperating with the first sliding guide 4 to drive the first carrier 2 to move. The first drive unit 6 includes a first worm gear 61 rotatably disposed on the base 1 and a drive motor 62 fixed on the base 1. The first worm gear 61 and the drive motor 62 are connected by a coupling 9. It also includes a first transmission rack 63 disposed on one side of the first carrier 2 and meshing with the first worm gear 61. It should be noted that the drive motor 62 is fixed on the base 1 by a motor connecting seat 8. The two ends of the central shaft of the first worm gear 61 are installed in the support grooves provided on the base 1. When the drive motor 62 drives the first worm gear 61 to rotate, the first worm gear 61 meshes with the first transmission rack 63 to push the first carrier 2 to move left and right along the first sliding guide 4.

[0036] Preferred, such as Figure 1-3 As shown, in order to realize the bidirectional movement of the lens relative to the optical engine in both directions (up, down, left, and right), it also includes a second support member 3, a second sliding guide part 5, and a second driving part 7. The second support member 3 is located above the first support member 2 and the two are connected through the second sliding guide part 5. The length extension direction of the first sliding guide part 4 is perpendicular to the length extension direction of the second sliding guide part 5. The second driving part 7 is disposed on the first support member 1 and cooperates with the second sliding guide part 5 to drive the second support member 3 to move.

[0037] It should be noted that, attached Figure 1 and 2 A lens shift mechanism with bidirectional movement is shown. The components of a lens shift mechanism with only unidirectional movement can be understood from the accompanying drawings. Therefore, no drawings showing a lens shift mechanism with only unidirectional movement are provided. The base 1, the first support member 2, and the second support member 3 are all provided with through holes at their relative positions. A deformable silicone dust cover is embedded in the through hole, and the silicone dust cover forms a sealed channel connecting the optical engine and the lens.

[0038] First, the above settings allow for adjustment of the lens position relative to the optical engine, thereby enabling the movement and adjustment of the projected image. Second, while ensuring movement adjustment, the layered layout optimizes space utilization and reduces space occupation. Third, due to the self-locking characteristic of the worm gear, it effectively avoids the problem of projected image jumps during movement adjustment and ensures that the mechanism described in this application is in a displacement locked state after movement adjustment. Compared with other adjustment methods, it can effectively avoid image shift caused by vibration during use. Through the above settings, this application can solve the above problems without setting other locking mechanisms, effectively reducing structural complexity and production costs while meeting the requirements of high-resolution projection. Finally, the first and second drive units are set independently, effectively reducing the accumulation of transmission errors caused by mechanical vibration during adjustment and ensuring operational stability. Furthermore, through the modular design of the base, the first carrier component, and the second carrier component, during use or production, it is not necessary to replace the entire carrier component; only some parts need to be replaced to adapt to different models of lenses or optical engines, effectively improving compatibility and reducing production costs.

[0039] Specifically, the second drive unit 7 includes a second worm gear 71 rotatably mounted on the first support member 2 and a drive motor 62 fixed on the first support member 2. The second worm gear 71 and the drive motor 62 are connected by a coupling 9. It also includes a second transmission rack 72 disposed on one side of the second support member 3 and meshing with the second worm gear 71. It should be noted that the two ends of the central shaft of the second worm gear 71 are installed in the support grooves provided on the first support member 2. The operating principles of the first drive unit 6 and the second drive unit 7 are the same, and will not be described in detail here. The transmission ratio of the first drive unit 6 or the second drive unit 7 can be set to be the same or different to adapt to different usage scenarios. In order to balance the difficulty of production and assembly, this application preferably has the same transmission ratio between the first drive unit 6 and the second drive unit 7.

[0040] Specifically, such as Figure 4As shown, the coupling part 9 includes a first coupling gear 91. One end of the first coupling gear 91 is provided with meshing teeth and meshes with a second coupling gear 92 provided at the end of the first worm 61 and / or the second worm 71. The other end of the first coupling gear 91 is provided with a insertion groove 912 that is adapted to the cross-sectional shape of the output shaft of the drive motor 62. When the output shaft of the drive motor 62 is inserted into the insertion groove 912 and is in normal transmission, there is a predetermined distance between the end of the output shaft and the bottom of the insertion groove 912. An elastic element 94 is provided between the first coupling gear 91 and the drive motor 62. The elastic element 94 has a preload and is sleeved on the first coupling gear 91. It should be noted that the second coupling gear 92 is integrally formed and connected with the first worm 61 and / or the second worm 71. The elastic element 94 is a compression spring sleeved on the first coupling gear 91. One end of the compression spring abuts against the first coupling gear 91, and the other end abuts against the drive motor 62. During normal operation, the coupling part 9 acts as a coupling to transmit power. At this time, the elastic element 94 provides preload to ensure stable meshing between the first coupling gear 91 and the second coupling gear 92, so as to ensure complete power transmission. Because the worm gear transmission ratio is very large, when the movement reaches the structural dead point or a mechanical failure causes sliding resistance, the power transmission between the drive motor 62 and the worm must be disconnected in time to avoid structural damage. This application presets a protection torque threshold of 5 kg·cm. When the movement reaches the structural dead point or sliding resistance causes the worm torque to exceed the protection torque threshold, a tendency for slippage and disengagement occurs between the meshing teeth of the first coupling gear 91 and the meshing teeth of the second coupling gear 92. At this time, the first coupling gear 91 moves backward against the preload of the elastic element 94, the elastic element 94 is compressed, and the first coupling gear 91 and the second coupling gear 92 disengage, thereby disconnecting the power transmission and avoiding structural damage. After the overload is eliminated, no manual intervention is required. Under the action of the preload of the elastic element 94, the first coupling gear 91 and the second coupling gear 92 are driven to re-mesh. Through the above settings, the shaft shifting mechanism described in this application achieves a combination of high-precision self-locking and overload flexible protection.

[0041] Specifically, such as Figure 5 , 6 As shown, in one embodiment, the first coupling gear 91 has a limiting post 911 coaxially provided at one end with meshing teeth, and the second coupling gear 92 has a limiting groove 921 at its end for the limiting post 911 to be inserted.

[0042] In another embodiment, a limiting post 911 is coaxially provided at the end of the second coupling gear 92, and a limiting groove 921 is provided at the end of the first coupling gear 91 with meshing teeth for the limiting post 911 to be inserted.

[0043] It should be noted that the axial height of the limiting post 911 is more than 2.5 times the axial height of the meshing teeth of the first coupling gear 91. With this setting, whether in normal operation or power transmission disconnection, the limiting post 911 is always partially located in the limiting groove 921, and the two are always in a limiting engagement. In normal operation, the limiting post 911 effectively shares the radial load impact, effectively improving the impact resistance and extending the tooth surface life. When power transmission is disconnected, the limiting post 911 and the limiting groove 921 guide the position deviation of the first coupling gear 91 and the second coupling gear 92 after disengagement and resetting, so that they are engaged in place when resetting, further ensuring complete power transmission.

[0044] Specifically, such as Figure 1-3 As shown, the first sliding guide part 4 includes a sliding block 10 disposed on the side of the first carrier 2. A guide rod 11 passes through the sliding block 10 and slides in cooperation with the sliding block 10. The two ends of the guide rod 11 are connected and fixed in the mounting groove 13 provided on the base 1 by fasteners 12. The mounting groove 13 and the base 1 are integral structures formed by processing. The second sliding guide part 5 includes a sliding block 10 disposed on the side of the second carrier 3. A guide rod 11 passes through the sliding block 10 and is connected and fixed in the mounting groove 13 provided on the first carrier 2 by fasteners 12. The mounting groove 13 and the first carrier 2 are integral structures formed by processing. Through the above arrangement, the smooth movement of the first carrier 2 and the second carrier 3 is ensured.

[0045] Specifically, the first bearing member 2 has a first sliding guide portion 4 on each of its opposite sides, such as... Figure 1-2 As shown, the first bearing member 2 is provided with first sliding guide portions 4 on both the upper and lower sides. The axial direction of the first worm gear 61 is parallel to the length extension direction of the first sliding guide portion 4. The first transmission rack 63 is provided on the side of the sliding block 10 near the first sliding guide portion 4 of the first worm gear 61. When in the initial position, the center of the meshing area between the first worm gear 61 and the first transmission rack 63 is located on the perpendicular bisector of the line connecting the two extreme positions of the first transmission rack 63. The initial position is the position where the optical axis of the lens coincides with the optical axis of the light emitted from the optical valve of the optical engine. It should be noted that the lens and the optical engine are common knowledge in the field and will not be described in detail here.

[0046] Specifically, the second bearing member 3 has a second sliding guide portion 5 on each of its opposite sides, such as... Figure 1-2As shown, the second bearing member 3 is provided with a second sliding guide 5 on both the left and right sides. The axial direction of the second worm 71 is parallel to the length extension direction of the second sliding guide 5. The second transmission rack 72 is provided on the side of the sliding block 10 near the second sliding guide 5 of the second worm 71. When in the initial position, the center of the meshing area between the second worm 71 and the second transmission rack 72 is located on the vertical bisector of the line connecting the two extreme positions of the second transmission rack 72. The initial position is the position where the optical axis of the lens coincides with the optical axis of the light emitted from the optical valve of the optical engine.

[0047] Specifically, the meshing area between the first worm 61 and the first transmission rack 63 is located in the middle region of the first transmission rack 63. Preferably, the meshing area between the second worm 71 and the second transmission rack 72 is also located in the middle region of the second transmission rack 72.

[0048] By setting two sets of first sliding guide parts 4 and two sets of second sliding guide parts 5, the smooth operation of the mechanism during adjustment is further ensured. Furthermore, under the premise of ensuring smooth operation, by integrating the first transmission rack 63 into the side of the first sliding guide part 4 and the second transmission rack 72 into the side of the second sliding guide part 5, the overall structure is made more compact and the adjustment action response is faster, further reducing the structural complexity and production cost. In addition, during the adjustment process, the central meshing design ensures that the transmission rack is evenly stressed on both sides, thereby ensuring that the sliding block 10 and the guide rod 11 are evenly stressed. This not only further ensures the stability of operation, but also effectively avoids the problem of bending of the guide rod 11 caused by uneven load.

[0049] Specifically, such as Figure 3 As shown, the fastener 12 is a spring clip, which is detachably connected to the mounting groove 13 and at least partially abuts against the top of the guide rod 11. The top of the mounting groove 13 is shaped to limit and cooperate with the spring clip. It should be noted that the fastener 12 can also be a cap adapted to the mounting groove 13. The spring clip described in this application has sufficient structural strength to limit and fix the guide rod 11 while also having a certain degree of elasticity, which can effectively absorb mechanical vibration during operation and reduce the impact of vibration on operational stability.

[0050] Specifically, the radial fit clearance between the guide rod 11 closer to the first worm 61 and the mounting groove is smaller than the radial fit clearance between the guide rod 11 farther from the first worm 61 and the mounting groove.

[0051] Specifically, the radial fit clearance between the guide rod 11 closer to the second worm 71 and the mounting groove is smaller than the radial fit clearance between the guide rod 11 farther from the second worm 71 and the mounting groove.

[0052] The lens shift mechanism described in this application uses the guide rod closer to the worm gear as the main positioning side and the guide rod farther from the worm gear as the secondary positioning side. During assembly, the main positioning side is installed first, followed by the secondary positioning side. While ensuring precise and efficient transmission, the guide rod on the secondary positioning side has a slight play, avoiding the problem of the two guide rods having an angle due to minor errors in machining, which would lead to uneven sliding after fixing.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] For those skilled in the art, various modifications and improvements can be made without departing from the concept of this utility model, and these modifications and improvements are all within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims.

Claims

1. A lens tilt-shift mechanism, characterized in that, include: The support assembly includes a base and a first support member, wherein the first support member is located above the base and the two are connected by a first sliding guide portion; The drive assembly includes a first drive unit disposed on the base and cooperating with the first sliding guide to drive the first carrier to move. The first drive unit includes a first worm gear rotatably disposed on the base and a drive motor fixed on the base. The first worm gear and the drive motor are connected by a coupling. The assembly also includes a first transmission rack disposed on one side of the first carrier and meshing with the first worm gear.

2. The lens shift mechanism according to claim 1, characterized in that, It also includes a second carrier, a second sliding guide, and a second driving part. The second carrier is located above the first carrier and the two are connected by the second sliding guide. The length extension direction of the first sliding guide is perpendicular to the length extension direction of the second sliding guide. The second driving part is disposed on the first carrier and cooperates with the second sliding guide to drive the second carrier to move.

3. A lens shift mechanism according to claim 2, characterized in that, The second drive unit includes a second worm gear rotatably mounted on the first support member and a drive motor fixed on the first support member. The second worm gear and the drive motor are connected by a coupling. It also includes a second transmission rack disposed on one side of the second support member and meshing with the second worm gear.

4. A lens shift mechanism according to claim 1 or 3, characterized in that, The coupling includes a first coupling gear, one end of which has meshing teeth that mesh with a second coupling gear located at the end of a first worm and / or a second worm. The other end of the first coupling gear has a slot that matches the cross-sectional shape of the output shaft of the drive motor. When the output shaft of the drive motor is inserted into the slot and is in normal operation, there is a predetermined distance between the end of the output shaft and the bottom of the slot. An elastic element is provided between the first coupling gear and the drive motor, and the elastic element has a preload.

5. A lens shift mechanism according to claim 4, characterized in that, The first coupling gear has a limiting post coaxially provided at one end with meshing teeth, and the second coupling gear has a limiting groove at its end for the limiting post to be inserted. Alternatively, a limiting post may be coaxially provided at the end of the second coupling gear, and a limiting groove may be provided at the end of the first coupling gear with meshing teeth for the limiting post to be inserted.

6. A lens shift mechanism according to claim 1 or 3, characterized in that, The first sliding guide includes a sliding block disposed on the side of the first carrier, a guide rod passing through the sliding block, and the two ends of the guide rod being connected and fixed in the mounting groove provided on the base by fasteners; Alternatively, the second sliding guide portion includes a sliding block disposed on the side of the second carrier member, a guide rod passing through the sliding block, and the two ends of the guide rod being connected and fixed in the mounting groove provided on the first carrier member by fasteners.

7. A lens shift mechanism according to claim 6, characterized in that, The first bearing member has a first sliding guide on each of its opposite sides. The first worm shaft is parallel to the length extension direction of the first sliding guide. The first transmission rack is located on the side of the sliding block near the first sliding guide of the first worm shaft. When in the initial position, the center of the meshing area between the first worm shaft and the first transmission rack is located on the perpendicular bisector of the line connecting the two extreme positions of the first transmission rack. The initial position is the position where the optical axis of the lens coincides with the optical axis of the light emitted from the optical valve of the optical engine.

8. A lens shift mechanism according to claim 6, characterized in that, The second bearing member has a second sliding guide on each of its opposite sides. The axial direction of the second worm is parallel to the length extension direction of the second sliding guide. The second transmission rack is located on the side of the sliding block near the second sliding guide of the second worm. When in the initial position, the center of the meshing area between the second worm and the second transmission rack is located on the perpendicular bisector of the line connecting the two extreme positions of the second transmission rack. The initial position is the position where the optical axis of the lens coincides with the optical axis of the light emitted from the optical valve of the optical engine.

9. A lens shift mechanism according to claim 7, characterized in that, The meshing area between the first worm and the first transmission rack is located in the middle region of the first transmission rack.

10. A lens shift mechanism according to claim 6, characterized in that, The fastener is a spring clip, which is detachably connected to the mounting groove and at least partially abuts against the top of the guide rod. The top of the mounting groove is shaped to cooperate with the limiting action of the spring clip.

11. A lens shift mechanism according to claim 7, characterized in that, The radial fit clearance between the guide rod closer to the first worm and the mounting groove is smaller than the radial fit clearance between the guide rod farther from the first worm and the mounting groove.

12. A lens shift mechanism according to claim 8, characterized in that, The radial fit clearance between the guide rod closer to the second worm and the mounting groove is smaller than the radial fit clearance between the guide rod farther from the second worm and the mounting groove.

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