Lens translation device for a projection device and projection device

Abstract

The utility model discloses a lens translation device and projection equipment for projection equipment, this lens translation device is used to drive the projection lens of projection equipment relative to the light machine shell in projection equipment and carries out the translation, the lens translation device includes mobile support, fixed base, guide rod, drive assembly and at least a group of elastic resistance assembly, the guide slot is opened on the mobile support, the guide rod is worn in the guide slot, and the guide rod is fixedly connected on the fixed base, the drive assembly is used for driving the mobile support moves along the guide rod, at least a group the elastic resistance assembly is arranged on the mobile support or the fixed base to make the guide rod and the inner wall of guide slot one side always keep abutment. The utility model provides a lens translation device and projection equipment for projection equipment, makes the projection picture in the moving process not to appear the fuzzy condition.

Description

Technical Field

[0001] This utility model relates to the field of projection equipment technology, and in particular to a lens translation device and a projection device for projection equipment. Background Technology

[0002] In some less-than-ideal projection scenarios, obstacles such as dents or decorative items on the wall can cause the projected image to become distorted. To avoid these obstacles without significantly moving the projector, users can typically install a rotating stand to adjust the projection direction or purchase a projector with a built-in motorized pan-tilt head to keep the projected image away from obstacles.

[0003] However, these solutions undoubtedly increase the overall size of the projection system due to the need for brackets and pan-tilt units.

[0004] Currently, some solutions involve using a translation drive rail inside the projector to control the radial movement of the projection lens, thereby controlling the direction of the projected beam passing through the lens. However, due to the sliding gap between the projection lens and the guide rail, tilting deviations often occur during the sliding process. Since the projection lens is very close to the spatial light modulator, the image clarity is highly sensitive to the angle of the beam incident on the lens, meaning that even a very slight tilting deviation can cause the image to blur. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model proposes a lens translation device and a projection device for a projection device, so that the projected image will not be blurred during the movement.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, this utility model discloses a lens translation device for a projection device, used to drive the projection lens of the projection device to translate relative to the optical engine housing inside the projection device. The lens translation device includes a movable bracket, a fixed base, a guide rod, a driving assembly, and at least one set of elastic abutment assemblies. The movable bracket has a guide groove, the guide rod passes through the guide groove, and the guide rod is fixedly connected to the fixed base. The driving assembly is used to drive the movable bracket to move along the guide rod. At least one set of elastic abutment assemblies is disposed on the movable bracket or the fixed base so that the guide rod always abuts against one side of the inner wall of the guide groove.

[0007] Preferably, the elastic clamping assembly includes a clamping member and an elastic member, the clamping member being fixedly connected to the movable bracket or the fixed base, and the elastic member being disposed between the clamping member and the guide rod.

[0008] Preferably, the movable bracket or the fixed base has a mounting hole, the clamping member is a clamping screw threaded into the mounting hole, and the elastic member is a clamping spring disposed between the clamping screw and the guide rod.

[0009] Preferably, the elastic clamping assembly further includes a gasket disposed between the end of the elastic member and the guide rod, and the side of the gasket near the guide rod is adapted to the surface shape of the guide rod.

[0010] Preferably, the elastic clamping assembly includes a spring clip, which is fixed to the fixed base, and the clamping jaws of the spring clip clamp the guide rod along the light emission direction of the projection lens.

[0011] Preferably, each guide rod is provided with at least two sets of elastic clamping components at intervals along its respective extension direction.

[0012] Preferably, each guide rod has two sets of elastic clamping components respectively disposed on the movable bracket or the fixed base at positions corresponding to both ends of the guide groove.

[0013] Preferably, the drive assembly includes a drive motor and a lead screw and nut assembly. The drive motor is mounted on the fixed base, and the lead screw and nut assembly includes a lead screw and a nut. The lead screw is connected to the output end of the drive motor, and the nut is connected to the movable bracket.

[0014] Secondly, this utility model discloses a projection device, including a projection lens, an optical engine housing, a light source and a spatial light modulator disposed within the optical engine housing, and also includes the lens translation device described in the first aspect, wherein the fixed base of the lens translation device is fixedly connected to the optical engine housing, and the movable bracket is fixedly connected to the projection lens.

[0015] Preferably, the projection device includes two sets of the above-mentioned lens translation devices, wherein the two sets of lens translation devices are a first set of lens translation devices and a second set of lens translation devices, the guide rod in the first set of lens translation devices is perpendicular to the guide rod in the second set of lens translation devices, and the fixed base in the first set of lens translation devices is fixedly connected to the optical engine housing, the fixed base in the second set of lens translation devices is fixedly connected to the movable bracket in the first set of lens translation devices, and the movable bracket in the second set of lens translation devices is fixedly connected to the projection lens.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The lens translation device and projection device disclosed in this utility model for projection equipment are provided with at least one set of elastic clamping components, so that the guide rod and one side of the inner wall of the guide groove always remain in contact, thereby further clamping the projection lens and the moving bracket, eliminating the movement gap that may cause tilting deviation, and ensuring that the projection lens and the moving bracket always maintain a stable abutting state during relative movement. This avoids tilting deviation of the projection lens relative to the spatial light modulator during radial movement, preventing blurring of the projected image during movement. In addition, this structure also solves the problem of slight wobble of the projection lens relative to the optical engine housing caused by the existence of screw pitch in threaded transmission. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the projection device disclosed in a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the projection device disclosed in a preferred embodiment of the present invention from another perspective; Figure 3 This is a schematic diagram of the structure of the X-axis lens translation device and the Y-axis lens translation device of the projection device disclosed in the preferred embodiment of this utility model; Figure 4 This is an internal side view of the projection device disclosed in a preferred embodiment of the present invention; Figure 5 This is a side view of the X-axis lens translation device and the Y-axis lens translation device of the projection device disclosed in the preferred embodiment of this utility model; Figure 6 yes Figure 5 A cross-sectional schematic diagram of AA in the diagram; Figure 7 yes Figure 6 Enlarged diagram of point B in the middle.

[0018] Explanation of icon numbers: 10. Projection lens; 20. Optical engine housing; 30. X-axis lens translation device; 31. X-axis moving bracket; 311. X-axis guide groove; 32. X-axis fixed base; 33. X-axis guide rod; X331. X-axis guide rod fastener; 34. X-axis drive assembly; 341. X-axis drive motor; 342. X-axis lead screw and nut pair; 3421. X-axis lead screw; 3422. X-axis nut; 35. X-axis elastic clamping assembly; 40. Y-axis lens translation device; 41. Y-axis moving bracket; 411. Y-axis guide groove; 412. Mounting hole; 42. Y-axis fixed base; 421. Second fixing hole; 43. Y-axis guide rod; 431. Y-axis guide rod fastener; 432. First fixing hole; 44. Y-axis drive assembly; 441. Y-axis drive motor; 442. Y-axis lead screw and nut pair; 4421. Y-axis lead screw; 4422. Y-axis nut; 45. Elastic clamping assembly; 451. Y-axis clamping component; 452. Y-axis elastic component; 453. Y-axis washer. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0020] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for both fixing and circuit / signal connectivity.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the embodiments of 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.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] like Figure 1 and Figure 2As shown, a preferred embodiment of this utility model discloses a lens translation device and a projection device for a projection equipment. The projection device includes a lens translation device, a projection lens 10, an optical engine housing 20, a light source (not shown), a spatial light modulator (not shown), and modulation optical elements (not shown) disposed within the optical engine housing. The light source, modulation optical elements, and spatial light modulator (DMD) are installed inside the optical engine housing 20. The light emitted by the light source passes through multiple relay lenses, speckle reduction elements, and other modulation optical elements before reaching the spatial light modulator (DMD), where it is modulated to form a beam carrying image information and sent to the projection lens 10.

[0024] In this embodiment, the projection device includes two sets of lens translation devices, namely an X-axis lens translation device 30 and a Y-axis lens translation device 40. The X-axis lens translation device 30 and the Y-axis lens translation device 40 are installed between the projection lens 10 and the optical engine housing 20, so that the projection lens 10 can be translated relative to the spatial light modulator (DMD) in the X-axis / Y-axis direction, thereby causing the light from the spatial light modulator (DMD) to be deflected after passing through the projection lens 10, and synchronously controlling the translation of the projected image on the wall.

[0025] Combination Figure 3 and Figure 4 The Y-axis lens translation device 40 includes a Y-axis moving bracket 41, a Y-axis fixed base 42, a Y-axis guide rod 43, and a Y-axis drive assembly 44. Y-axis guide grooves 411 are formed on opposite sides of the Y-axis moving bracket 41. The Y-axis guide rod 43 passes through the Y-axis guide groove 411 with a clearance fit and is fixedly connected to the Y-axis fixed base 42. The Y-axis drive assembly 44 drives the Y-axis moving bracket 41 to move along the Y-axis guide rod 43. Specifically, the Y-axis guide rod 43 passes through the Y-axis guide groove 411 and is fixed to the Y-axis fixed base 42 by fasteners such as screws. The Y-axis fixed base 42 is then fixed to the optical engine housing 20. The Y-axis drive assembly 44 includes a Y-axis drive motor 441 and a Y-axis lead screw and nut assembly 442. The Y-axis drive motor 441 is mounted on the Y-axis fixed base 42. The Y-axis lead screw and nut assembly 442 includes a Y-axis lead screw 4421 and a Y-axis nut 4422. The Y-axis lead screw 4421 is connected to the output end of the Y-axis drive motor 441, and the Y-axis nut 4422 is connected to the Y-axis moving bracket 41. The Y-axis nut 4422 is connected to the Y-axis lead screw 4421, thereby enabling the Y-axis drive motor 441 to drive the Y-axis moving bracket 41 to move along the Y-axis guide rod 43.

[0026] Furthermore, the Y-axis guide rod 43 is fixed to the Y-axis fixed base 42 by the Y-axis guide rod fixing member 431; specifically, the Y-axis guide rod 43 is provided with a first fixing hole 432, and the Y-axis fixed base 42 is provided with a second fixing hole 421. The Y-axis guide rod fixing member 431 passes through the first fixing hole 432 and the second fixing hole 421 in sequence to fix the Y-axis guide rod 43 to the Y-axis fixed base 42.

[0027] The X-axis lens translation device 30 includes an X-axis moving bracket 31, an X-axis fixed base 32, an X-axis guide rod 33, and an X-axis drive assembly 34. The projection lens 10 is fixed on the X-axis moving bracket 31. X-axis guide grooves 311 are provided on the opposite two side edges of the X-axis moving bracket 31. The X-axis guide rod 33 is fitted into the X-axis guide groove 311 with clearance fit, and the X-axis guide rod 33 is fixedly connected to the X-axis fixed base 32. The X-axis drive assembly 34 includes an X-axis drive motor 341 and an X-axis lead screw and nut assembly 342. The X-axis drive motor 341 is mounted on the X-axis fixed base 32. The X-axis lead screw and nut assembly 342 includes an X-axis lead screw 3421 and an X-axis nut 3422. The X-axis lead screw 3421 is connected to the output end of the X-axis drive motor 341, and the X-axis nut 3422 is connected to the X-axis moving bracket 31. The X-axis nut 3422 is connected to the X-axis lead screw 3421, thereby enabling the X-axis drive motor 341 to drive the X-axis moving bracket 31 to move along the X-axis guide rod 33.

[0028] In this embodiment, the X-axis guide rod 33 and the Y-axis guide rod 43 are perpendicular to each other. The X-axis moving bracket 31 is fixedly connected to the projection lens 10, and the Y-axis fixed base 42 is fixedly connected to the optical engine housing 20. The X-axis fixed base 32 and the Y-axis moving bracket 41 are fixedly connected. Furthermore, the X-axis fixed base 32 and the Y-axis moving bracket 41 can be an integral structure, that is, a part of the Y-axis moving bracket 41 can be used as the X-axis fixed base 32. The X-axis guide rod 33 is fixed to the Y-axis moving bracket 41 by X-axis guide rod fasteners 331 such as screws.

[0029] The X-axis guide rod 33 and X-axis guide groove 311, and the Y-axis guide rod 43 and Y-axis guide groove 411 are respectively clearance fits. Due to the existence of minute gaps, there will inevitably be a certain tilt deviation between the corresponding guide rod and guide groove during relative sliding. This minute deviation will greatly affect the light path entering the projection lens 10 from the spatial light modulator (DMD), resulting in a blurred projection image. To eliminate this deviation, the X-axis lens translation device 30 in this embodiment also includes at least one set of X-axis elastic abutment components 35, and the Y-axis lens translation device 40 also includes at least one set of Y-axis elastic abutment components 45. At least one set of elastic abutment components 35 is disposed on the X-axis moving bracket 31 so that the X-axis guide rod 33 always abuts against one side of the inner wall of the X-axis guide groove 311; at least one set of elastic abutment components 45 is disposed on the Y-axis moving bracket 41 so that the Y-axis guide rod 43 always abuts against one side of the inner wall of the Y-axis guide groove 411.

[0030] In this embodiment, at least one set of elastic clamping components is added between each set of guide rods and the bracket. This allows the components to abut against the guide rods on one side, ensuring that the guide rods are always pressed to one side during sliding. This prevents tilting deviations of the guide rods in the guide grooves due to minute gaps, and in particular, avoids lens shaking caused by internal machine vibrations. Furthermore, the elastic clamping components also prevent the X-axis / Y-axis moving bracket from wobbling in the sliding direction due to thread clearance between the lead screw and nut, further ensuring the accuracy of movement.

[0031] It should be noted that the clamping force provided by the elastic clamping component should be minimized as much as possible while ensuring effective elimination of the gap between the guide rod and the guide groove to avoid excessively increasing the load on the drive component. Those skilled in the art can determine the appropriate elastic force range through conventional experiments based on factors such as the guide rod material, surface finish, and the torque of the drive component. The guide rod and guide groove can be, for example, a sliding rod and a sliding groove, respectively.

[0032] In some further embodiments, combined with Figures 5 to 7The Y-axis elastic clamping assembly 45 includes a Y-axis clamping member 451 and a Y-axis elastic member 452. The Y-axis clamping member 451 is fixedly connected to the Y-axis moving bracket 41. The Y-axis elastic member 452 is disposed between the Y-axis clamping member 451 and the Y-axis guide rod 43, and maintains elastic pressure on the Y-axis guide rod 43 under the push of the Y-axis clamping member 451. The Y-axis moving bracket 41 has a mounting hole 412. The bottom of the mounting hole 412 is connected to the Y-axis guide groove 411 so as to face the Y-axis guide rod 43. The Y-axis clamping member 451 is a clamping screw threaded into the mounting hole 412. The Y-axis elastic member 452 is a clamping spring set between the clamping screw and the Y-axis guide rod 43. The bottom of the clamping screw elastically presses the clamping spring against the Y-axis guide rod 43, thereby providing elastic force for the Y-axis guide rod 43 to press against the Y-axis guide groove 411. This will not completely jam the Y-axis guide rod 43 and cause the Y-axis guide rod 43 to be unable to slide. It takes into account the smoothness of movement and compensates for the gap of the clearance fit without affecting the lens image resolution effect. Furthermore, the Y-axis elastic clamping assembly 45 also includes a Y-axis washer 453. The Y-axis washer 453 is disposed between the end of the Y-axis elastic member 452 and the Y-axis guide rod 43, and the side of the Y-axis washer 453 near the Y-axis guide rod 43 is adapted to the surface shape of the Y-axis guide rod 43, which can reduce scratches on the Y-axis guide rod 43. Specifically, the Y-axis washer 453 can be, for example, a wear-resistant rubber pad. In a specific embodiment, each Y-axis guide rod 43 is provided with two sets of Y-axis elastic clamping assemblies 45 at intervals along its respective extension direction. The two sets of Y-axis elastic clamping assemblies 45 are respectively disposed on the Y-axis moving bracket 41 at the positions corresponding to the two ends of the Y-axis guide groove. This can further ensure that the Y-axis guide rod 43 will not tilt at one end, and ensure the smoothness of the projection lens 10 moving along the Y-axis.

[0033] Correspondingly, the X-axis elastic clamping assembly 35 includes an X-axis clamping member and an X-axis elastic member. The X-axis clamping member is fixedly connected to the X-axis moving bracket 31, and the X-axis elastic member is disposed between the X-axis clamping member and the X-axis guide rod 33, and maintains elastic pressure on the X-axis guide rod under the push of the X-axis clamping member. The X-axis moving bracket 31 has a mounting hole, the bottom of which is connected to the X-axis guide groove 311 facing the X-axis guide rod 33. The X-axis clamping member is a clamping screw threaded into the mounting hole, and the X-axis elastic member is a clamping spring disposed between the clamping screw and the X-axis guide rod 33. The bottom of the clamping screw elastically presses the clamping spring against the X-axis guide rod 33, thereby providing elastic force for the X-axis guide rod 33 to press against the X-axis guide groove 311. This prevents the X-axis guide rod 33 from being completely jammed and unable to slide, thus balancing smooth movement and offsetting the gap of the clearance fit without affecting the lens image resolution effect. Furthermore, the X-axis elastic clamping assembly 35 also includes an X-axis washer, which is disposed between the end of the X-axis elastic member and the X-axis guide rod 33. The side of the X-axis washer near the X-axis guide rod 33 is adapted to the surface shape of the X-axis guide rod 33, which can reduce scratches on the X-axis guide rod 33. Specifically, the X-axis washer can be, for example, a wear-resistant rubber pad. In a specific embodiment, each X-axis guide rod 33 is provided with two sets of X-axis elastic clamping assemblies 35 at intervals along its respective extension direction. The two sets of X-axis elastic clamping assemblies 35 are respectively disposed on the X-axis moving bracket 31 at positions corresponding to the two ends of the X-axis guide groove. This can further ensure that the X-axis guide rod 33 will not tilt at one end, ensuring the smoothness of the projection lens 10 moving along the X-axis.

[0034] In some further embodiments, the Y-axis elastic clamping assembly 45 can also employ spring clips. For example, two spring clips are mounted on the Y-axis fixed base, with the clamping jaws of the two spring clips clamping the Y-axis guide rod 43 along the Z-axis direction (parallel to the light emission direction of the projection lens). This also provides elastic force between the Y-axis guide rod 43 and one side of the Y-axis guide groove 411, and is relatively easy to disassemble. Correspondingly, the X-axis elastic clamping assembly 35 can also employ spring clips. For example, two spring clips are mounted on the X-axis fixed base, with the clamping jaws of the two spring clips clamping the X-axis guide rod 33 along the Z-axis direction (parallel to the light emission direction of the projection lens). This also provides elastic force between the X-axis guide rod 33 and one side of the X-axis guide groove 311, and is relatively easy to disassemble.

[0035] The preferred embodiment of this utility model discloses a lens translation device and a projection device for a projection device. By eliminating the gap between the projection lens 10 and the translation bracket, the projection lens 10 is prevented from tilting during radial movement relative to the spatial light modulator, so that the projected image will not be blurred during the movement.

[0036] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope defined by the appended claims.

Claims

1. A lens translation device for a projection device, characterized in that, The lens translation device is used to drive the projection lens of the projection device to translate relative to the optical engine housing inside the projection device. The lens translation device includes a movable bracket, a fixed base, a guide rod, a drive assembly, and at least one set of elastic clamping assemblies. The movable bracket has a guide groove, the guide rod passes through the guide groove, and the guide rod is fixedly connected to the fixed base. The drive assembly is used to drive the movable bracket to move along the guide rod. At least one set of elastic clamping assemblies is disposed on the movable bracket or the fixed base so that the guide rod always remains in contact with one side of the inner wall of the guide groove.

2. The lens translation device according to claim 1, characterized in that, The elastic clamping assembly includes a clamping member and an elastic member. The clamping member is fixedly connected to the movable bracket or the fixed base, and the elastic member is disposed between the clamping member and the guide rod.

3. The lens translation device according to claim 2, characterized in that, The movable bracket or the fixed base has a mounting hole, the clamping member is a clamping screw threaded into the mounting hole, and the elastic member is a clamping spring disposed between the clamping screw and the guide rod.

4. The lens translation device according to claim 2, characterized in that, The elastic clamping assembly further includes a gasket disposed between the end of the elastic member and the guide rod, and the side of the gasket near the guide rod is adapted to the surface shape of the guide rod.

5. The lens translation device according to claim 1, characterized in that, The elastic clamping assembly includes a spring clip, which is fixed to the fixed base, and the clamping jaws of the spring clip clamp the guide rod along the light output direction of the projection lens.

6. The lens translation device according to any one of claims 1 to 5, characterized in that, Each guide rod is provided with at least two sets of elastic clamping components at intervals along its respective extension direction.

7. The lens translation device according to claim 6, characterized in that, Each guide rod has two sets of elastic clamping components respectively disposed on the movable bracket or the fixed base at positions corresponding to both ends of the guide groove.

8. The lens translation device according to claim 1, characterized in that, The drive assembly includes a drive motor and a lead screw and nut assembly. The drive motor is mounted on the fixed base. The lead screw and nut assembly includes a lead screw and a nut. The lead screw is connected to the output end of the drive motor, and the nut is connected to the movable bracket.

9. A projection device, characterized in that, The device includes a projection lens, an optical engine housing, a light source and a spatial light modulator disposed within the optical engine housing, and a lens translation device as described in any one of claims 1 to 8, wherein the fixed base of the lens translation device is fixedly connected to the optical engine housing, and the movable bracket is fixedly connected to the projection lens.

10. The projection device according to claim 9, characterized in that, The system includes two sets of the aforementioned lens translation devices, namely a first set of lens translation devices and a second set of lens translation devices. The guide rod in the first set of lens translation devices is perpendicular to the guide rod in the second set of lens translation devices. The fixed base in the first set of lens translation devices is fixedly connected to the optical engine housing. The fixed base in the second set of lens translation devices is fixedly connected to the movable bracket in the first set of lens translation devices. The movable bracket in the second set of lens translation devices is fixedly connected to the projection lens.

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