Optical adjustment structure and projection device

Abstract

The application relates to the technical field of projection equipment, in particular to an optical adjusting structure and projection equipment, the optical adjusting structure comprising a protective shell, a contrast lens, a first adjusting support, a first adjusting lens and a first fastening assembly, a mounting cavity is formed in the protective shell, the protective shell comprises a back plate, an inner surface of the back plate is provided with a first limiting guide groove, the first limiting guide groove extends along a first direction; the first adjusting support is arranged in the mounting cavity, the first adjusting support is provided with a first protruding part, the first protruding part is movably arranged in the first limiting guide groove, so that the first adjusting support can move relative to the back plate along the first direction; the first adjusting lens is mounted on the first adjusting support, the first adjusting lens and the contrast lens are opposite along the first direction, and the distance between the first adjusting lens and the contrast lens along the first direction can be adjusted when the first adjusting support moves along the first direction. The application can improve the brightness and chroma uniformity of a projection picture.

Description

Technical Field

[0001] This application relates to the field of projection equipment technology, and in particular to an optical adjustment structure and projection equipment. Background Technology

[0002] With the technological development of projection equipment, users have put forward increasingly stringent requirements for the optical performance indicators of projection equipment. Among them, core indicators such as brightness, color uniformity, resolution and imaging stability have become key factors in determining product competitiveness. As the core component of the optical path system of projection equipment, the precise adjustment of the spatial position of the optical lens to the optimal state directly determines the stability of light path propagation and the efficiency of optical performance.

[0003] In the optical system of a projection device, the positional accuracy and fixed reliability of optical lenses have a decisive impact on the overall performance of the device. According to the optical path design theory, the light emitted by the light source needs to be precisely refracted, reflected or filtered by each optical lens before propagating along the preset theoretical path and converging to form an image. Any deviation in the position of any lens may cause the light path to deviate from the designed trajectory.

[0004] In related technologies, in order to improve the brightness and color uniformity of the projected image, the position of the optical lens needs to be adjusted. However, during the adjustment of the optical lens position, due to the poor reliability of the optical lens setting, the optical lens is prone to deviating from the theoretical path, making it difficult to solve the problem of brightness and color uniformity of the projected image. Utility Model Content

[0005] This application discloses an optical adjustment structure and projection device that can improve the brightness and color uniformity of the projected image.

[0006] To achieve the above objectives, this application discloses an optical adjustment structure, comprising: A protective shell, wherein an installation cavity is formed inside the protective shell, the protective shell includes a back plate, and a first limiting guide groove is provided on the inner surface of the back plate, the first limiting guide groove extending along a first direction; A reference lens, which is fixedly disposed within the mounting cavity; A first adjusting bracket is disposed within the mounting cavity. The first adjusting bracket has a first protrusion, which is movably disposed in the first limiting guide groove so that the first adjusting bracket can move relative to the back plate in the first direction. A first adjusting lens is mounted on a first adjusting bracket. The first adjusting lens and the reference lens are opposite each other along the first direction. When the first adjusting bracket moves in the first direction, the distance between the first adjusting lens and the reference lens in the first direction can be adjusted. A first fastening assembly is used to fasten the adjusted first adjusting bracket to the back plate.

[0007] In this embodiment, when the first adjustment lens needs to be adjusted, the protective shell is first opened and the first fastening component is loosened from fixing the first adjustment bracket to the back plate. Then, the first adjustment bracket is pushed relative to the back plate in the first direction as needed until the image emitted by the projection device meets the expected requirements. Then, the first fastening component is used to fix the adjusted first adjustment bracket to the back plate.

[0008] Since the first protrusion on the first adjustment bracket is slidably inserted into the first limiting guide groove on the back plate, when the first adjustment bracket moves relative to the back plate along the first direction, the guiding effect of the first limiting guide groove on the first protrusion can ensure the consistency of the movement trajectory of the first adjustment bracket along the first direction. Furthermore, since the first adjustment lens is set on the first adjustment bracket, the risk of the first adjustment lens deviating from the light path when moving along the first direction is reduced, thereby improving the overall reliability of the optical adjustment structure. This also avoids the problem of uneven brightness and color of the projected image caused by the deviation of the first adjustment lens, and improves the texture of the projected image.

[0009] In some possible implementations, the first fastening component includes: A first fastening hole is provided in the back plate; The first strip-shaped hole is disposed on the first adjusting bracket; The first fastener has one end passing through the first strip hole and threadedly connected to the first fastening hole.

[0010] In this embodiment, the first strip hole allows the first adjustment bracket to have a certain degree of freedom of movement within a certain range. When adjusting the distance between the first adjustment lens and the reference lens, the first adjustment bracket can move within the range allowed by the first strip hole, thereby enabling precise adjustment of the position of the first adjustment lens to achieve the best optical effect.

[0011] In addition, one end of the first fastener passes through the first strip hole and is threaded into the first fastening hole. This connection method can provide reliable fastening force. Once the first adjustment bracket is moved to the appropriate position, the first adjustment bracket can be firmly fixed to the back plate by tightening the first fastener to prevent it from shifting during use.

[0012] In addition, the first fastening component has a simple structure and is relatively easy to install and remove. Specifically, during installation, when the first adjusting bracket is moved to the appropriate position, the first fastener is first passed through the first strip hole and screwed into the first fastening hole to complete the installation. During removal, the first adjusting bracket can be removed from the back plate by reversing the operation.

[0013] In some possible implementations, the first fastening hole includes two; The first strip hole includes two, and the two first strip holes correspond to the two first fastening holes respectively. The two first strip holes are spaced apart along the first direction and are located on opposite sides of the first limiting guide groove. The first fastener includes two, and the two first fasteners correspond to the two first fasteners respectively.

[0014] Since the two first strip holes are spaced apart along the first direction and located on opposite sides of the first limiting guide groove, and correspond to the two first fastening holes, the two first fasteners can provide fastening force on opposite sides of the first adjusting bracket, thereby enhancing the stability of the first adjusting bracket in the mounting cavity, reducing the possibility of it shifting during adjustment or use, ensuring that the optical lens can be kept in an accurate position, and thus helping to improve the brightness and color uniformity of the projected image.

[0015] In addition, compared to the case of a single first fastener, two first fasteners can avoid the problem of excessive or insufficient local force on the first adjustment bracket, so that the first adjustment bracket can be more stably maintained in the adjusted position after fastening, reducing the risk of deformation of the first adjustment bracket or change of position of the first adjustment lens due to uneven fastening force, thereby improving the reliability and stability of the optical adjustment structure.

[0016] In some possible implementations, the first adjustment bracket has a first positioning surface, which is a surface facing the back plate; The back plate has a second positioning surface corresponding to the first positioning surface, and the second positioning surface is in close contact with the first positioning surface.

[0017] The tight fit between the first and second positioning surfaces provides a precise positioning reference for the installation of the first adjustment bracket on the back plate. This surface-to-surface fit effectively restricts the first adjustment bracket's degrees of freedom in multiple directions, allowing it to be accurately installed in the preset position. This ensures the relative positional accuracy between the first adjustment lens and the reference lens, which is beneficial for improving the brightness and color uniformity of the projected image. Furthermore, the tight fit between the first and second positioning surfaces increases the contact area between the first adjustment bracket and the back plate, making the connection between them more stable.

[0018] In some possible implementations, the optical adjustment structure further includes: The second adjustment bracket is disposed in the mounting cavity and is movable relative to the back plate in the first direction; The second adjustment lens is disposed on the second adjustment bracket. When the second adjustment bracket moves relative to the back plate along the first direction, it can adjust the distance between the second adjustment lens and the reference lens in the first direction.

[0019] Since the second adjustment lens is mounted on the second adjustment bracket, and the second adjustment bracket can move relative to the back panel in the first direction, the second adjustment lens, the reference lens, and the first adjustment lens form a "reference lens + dual adjustment lens" combination structure. This allows for the individual or coordinated adjustment of the distance between the first and second adjustment lenses and the reference lens, thereby enabling the handling of more complex optical deviation scenarios. For example, it can precisely compensate for brightness / color differences in different areas of the image by finely adjusting the positions of the first and second adjustment lenses. Compared to a single adjustment lens, it has a stronger ability to optimize the uniformity of the projected image.

[0020] In some possible implementations, the first adjusting bracket is provided with a second limiting guide groove, which extends along the first direction; The second adjusting bracket is provided with a second protrusion, which is movably inserted into the second limiting guide groove; The optical adjustment structure further includes a second fastening component, which is used to fasten the adjusted second adjustment bracket to the first adjustment bracket.

[0021] Since the second limiting guide groove extends along the first direction and the second protrusion can be movably inserted therein, the second limiting guide groove defines a unique direction (the first direction) for the movement of the second adjustment bracket. This structure can prevent the second adjustment bracket from shifting laterally or shaking during the adjustment process, ensuring that the second adjustment lens always moves along the theoretical path, avoiding optical deviation caused by lens shift, and providing a basis for accurately adjusting the distance between the second adjustment lens and the reference lens.

[0022] In addition, the second adjustment bracket cooperates with the second limiting guide groove of the first adjustment bracket through the second protrusion to form a dual adjustment mode of "the first adjustment bracket driving the second adjustment bracket to move as a whole + the second adjustment bracket moving independently relative to the first adjustment bracket". When adjusting the first adjustment bracket, the second adjustment bracket can move synchronously along the first direction to achieve "coarse adjustment" of the distance between the second adjustment lens and the reference lens. When adjusting the second adjustment bracket alone, "fine adjustment" can be performed on the basis of the first adjustment bracket. Compared with single independent adjustment, it can optimize optical parameters more efficiently and adapt to complex image uniformity requirements.

[0023] In some possible implementations, the second fastening component includes: The second fastening hole is provided in the first adjusting bracket; The second strip-shaped hole is disposed on the second adjusting bracket and extends along the first direction; The second fastener has one end passing through the second strip hole and threadedly connected to the second fastening hole.

[0024] Because the second strip hole extends along the first direction, when the second fastener passes through the second strip hole and is threaded into the second fastening hole, the second adjusting bracket can move within a certain range in the first direction.

[0025] Furthermore, one end of the second fastener passes through the second strip hole and is threaded into the second fastening hole. This threaded connection provides reliable fastening force, firmly fixing the second adjustment bracket to the first adjustment bracket. That is, once the first adjustment bracket is adjusted to the appropriate position relative to the second adjustment bracket, tightening the second fastener can prevent the second adjustment bracket from shifting due to vibration, collision or other factors during equipment operation, thus ensuring the stability and reliability of the optical system.

[0026] In some possible implementations, the first adjustment bracket also has a third positioning surface, which is a surface facing away from the back plate; The second adjusting bracket has a fourth positioning surface corresponding to the third positioning surface, and the fourth positioning surface is in close contact with the third positioning surface.

[0027] Because of the tight fit between the third and fourth positioning surfaces, a clear reference surface is provided for the second adjustment bracket, restricting its degrees of freedom perpendicular to the first direction (such as up and down, left and right). Even when adjusting the second adjustment bracket, the surface contact fit prevents it from tilting or shifting, ensuring that the second adjustment lens always moves along the first direction. This avoids optical deviations caused by misalignment of the second adjustment bracket and guarantees precise control of the distance between the second adjustment lens and the reference lens.

[0028] In addition, the first adjustment bracket and the second adjustment bracket are closely fitted together through the third positioning surface and the fourth positioning surface, forming a stable "superimposed" structure. When the adjustment of the first adjustment bracket drives the second adjustment bracket to move as a whole, the two will not wobble relative to each other due to the gap. This stable linkage can reduce the error when the first adjustment bracket and the second adjustment bracket are adjusted together, and ensure that the distance change between the first adjustment lens, the second adjustment lens and the control lens always meets the expectation, avoiding fluctuations in the brightness and color uniformity of the image caused by the looseness between the first adjustment bracket and the second adjustment bracket.

[0029] In some possible implementations, the first adjusting bracket is provided with a first adhesive groove; and / or, The second adjustment bracket is provided with a second glue groove.

[0030] Since the first adjustment bracket is provided with a first glue groove, the first glue groove can be used to fill glue. Through the adhesive effect of the glue, the first adjustment lens can be more firmly connected to the first adjustment bracket, thereby preventing the first adjustment lens from shifting during use and ensuring the stability and reliability of the optical system.

[0031] Similarly, since the second adjustment bracket is provided with a second adhesive groove, the second adjustment lens can be glued to the second adjustment bracket.

[0032] Secondly, this application also provides a projection device, including the optical adjustment structure described in any one of the first aspects.

[0033] Since the projection device includes the light adjustment structure described in the first aspect, it is possible to improve the brightness and color uniformity of the projected image.

[0034] Compared with the prior art, the beneficial effects of this application are as follows: Since the first protrusion on the first adjustment bracket is slidably inserted into the first limiting guide groove on the back plate, when the first adjustment bracket moves relative to the back plate along the first direction, the guiding effect of the first limiting guide groove on the first protrusion can ensure the consistency of the movement trajectory of the first adjustment bracket along the first direction. Furthermore, since the first adjustment lens is set on the first adjustment bracket, the risk of the first adjustment lens deviating from the light path when moving along the first direction is reduced, thereby improving the overall reliability of the optical adjustment structure. This also avoids the problem of uneven brightness and color of the projected image caused by the deviation of the first adjustment lens, and improves the texture of the projected image. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the optical adjustment structure provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure provided in the embodiment of this application, which shows the first limiting guide groove provided on the back plate; Figure 3 This is a schematic diagram of the structure of the first adjustment bracket provided in the embodiment of this application from a first perspective; Figure 4 This is a schematic diagram of the structure of the first adjustment bracket from a second perspective provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the second adjustment bracket provided in the embodiment of this application disposed in the mounting cavity; Figure 6 This is a schematic diagram of the structure of the second adjustment bracket disposed on the first adjustment bracket according to an embodiment of this application; Figure 7 This is an exploded view of the second adjusting bracket provided in the embodiment of this application, which is disposed on the first adjusting bracket; Figure 8 This is a schematic diagram of the second adjustment bracket provided in the embodiments of this application from a first perspective; Figure 9 This is a schematic diagram of the second adjustment bracket from a second perspective provided in an embodiment of this application; Figure 10 This is a schematic diagram of the projection device provided in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures: 100-Optical adjustment structure; 110 - Protective shell; 111 - Mounting cavity; 112 - Back plate; 1121 - First limiting guide groove; 1122 - Second positioning surface; 120-reference lens; 130 - First adjusting bracket; 131 - First protrusion; 132 - First positioning surface; 133 - Second limiting guide groove; 134 - Third positioning surface; 135 - First adhesive groove; 140 - First adjusting lens; 150 - First fastening assembly; 151 - First fastening hole; 152 - First strip hole; 153 - First fastener; 160 - Second adjusting bracket; 161 - Second protrusion; 162 - Fourth positioning surface; 163 - Second adhesive groove; 170 - Second adjustment lens; 180 - Second fastening assembly; 181 - Second fastening hole; 182 - Second strip hole; 183 - Second fastener; 200 - Projection equipment. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0040] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0042] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0043] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0044] See Figure 1 , Figure 2 and Figure 3 This application provides an optical adjustment structure 100, which includes a protective shell 110, a reference lens 120, a first adjustment bracket 130, a first adjustment lens 140, and a first fastening assembly 150. The protective shell 110 has a mounting cavity 111 and includes a back plate 112. The inner surface of the back plate 112 has a first limiting guide groove 1121 extending along a first direction. The reference lens 120 is fixedly disposed within the mounting cavity 111. The first adjustment bracket 130 is disposed within the mounting cavity 111. The first adjustment bracket 130 is provided with a first protrusion 131, which is movably disposed in the first limiting guide groove 1121 so that the first adjustment bracket 130 can move relative to the back plate 112 in the first direction; the first adjustment lens 140 is mounted on the first adjustment bracket 130, and the first adjustment lens 140 and the reference lens 120 are opposite to each other in the first direction. When the first adjustment bracket 130 moves in the first direction, the distance between the first adjustment lens 140 and the reference lens 120 in the first direction can be adjusted; the first fastening assembly 150 is used to fasten the adjusted first adjustment bracket 130 to the back plate.

[0045] Among them, the protective shell 110 has a light-shielding effect.

[0046] The aforementioned reference lens 120 and first adjusting lens 140 include, but are not limited to, concave lenses, convex lenses, and diffusers. For example, the reference lens 120 is a diffuser used to shape the light beam emitted from the first adjusting lens 140 and improve its uniformity. The first adjusting lens 140 is a convex lens. Thus, by adjusting the distance between the first adjusting lens 140 and the reference lens 120, the size and brightness of the light spot incident on the reference lens 120 can be adjusted.

[0047] The first direction mentioned above refers to the optical axis direction of the reference lens at 120 degrees, which is... Figure 1 The direction indicated by the X arrow.

[0048] In addition, when the first protrusion 131 cooperates with the first limiting guide groove 1121, the distance between the first protrusion 131 and the first limiting guide groove 1121 is as small as possible, so as to ensure the guiding performance of the first limiting guide groove on the first protrusion 131.

[0049] In this embodiment, when the first adjustment lens 140 needs to be adjusted, the protective shell 110 is first opened, and the first fastening component 150 is loosened from fixing the first adjustment bracket 130 to the back plate. Then, the first adjustment bracket 130 is pushed along the first direction to move relative to the back plate 112 as needed until the image emitted by the projection device meets the expected requirements. Then, the first fastening component 150 is used to fix the adjusted first adjustment bracket 130 to the back plate 112.

[0050] Of course, considering the influence of ambient light on the projection device, the protective housing 110 can be placed in a dark environment. For example, after loosening the first fastening component 150, the protective housing 110 is placed in a dark environment, and the first adjustment bracket 130 is adjusted to move in the first direction according to the projection screen.

[0051] Since the first protrusion 131 on the first adjustment bracket 130 is slidably inserted into the first limiting guide groove 1121 on the back plate 112, when the first adjustment bracket 130 moves relative to the back plate 112 along the first direction, the guiding effect of the first limiting guide groove 1121 on the first protrusion 131 can ensure the consistency of the movement trajectory of the first adjustment bracket 130 along the first direction. Since the first adjustment lens 140 is disposed on the first adjustment bracket 130, the risk of the first adjustment lens 140 deviating from the light path when moving along the first direction is reduced, thereby improving the overall reliability of the optical adjustment structure 100 and avoiding the problem of uneven brightness and color of the projected image caused by the deviation of the first adjustment lens 140, thus improving the texture of the projected image.

[0052] In some possible embodiments, see Figure 2 and Figure 3The first fastening assembly 150 includes a first fastening hole 151, a first strip hole 152, and a first fastener 153. The first fastening hole 151 is disposed on the back plate 112; the first strip hole 152 is disposed on the first adjusting bracket 130; one end of the first fastener 153 passes through the first strip hole 152 and is threadedly connected to the first fastening hole 151.

[0053] The first fastener 153 can be a screw, bolt, etc.

[0054] In this embodiment, the first strip hole 152 allows the first adjustment bracket 130 to have a certain degree of freedom of movement within a certain range. When adjusting the distance between the first adjustment lens 140 and the reference lens 120, the first adjustment bracket 130 can move within the range allowed by the first strip hole 152, thereby enabling precise adjustment of the position of the first adjustment lens 140 to achieve the best optical effect.

[0055] In addition, one end of the first fastener 153 passes through the first strip hole 152 and is threadedly connected to the first fastening hole 151. This connection method can provide reliable fastening force. Once the first adjusting bracket 130 is moved to the appropriate position, the first adjusting bracket 130 can be firmly fixed to the back plate 112 by tightening the first fastener 153 to prevent it from shifting during use.

[0056] In addition, the first fastening assembly 150 has a simple structure and is relatively easy to install and remove. Specifically, during installation, when the first adjusting bracket 130 is moved to the appropriate position, the first fastener 153 is first passed through the first strip hole 152 and screwed into the first fastening hole 151 to complete the installation. During removal, the first adjusting bracket 130 can be removed from the back plate 112 by reversing the operation.

[0057] It should be noted that the first fastener 153 has a greater range of motion within the first slot 152 than the first protrusion 131 has a greater range of motion within the first limiting guide groove 1121, so as to ensure the degree of freedom of the first adjusting bracket 130 to move in the first direction.

[0058] Of course, in some other embodiments, the first fastening assembly 150 includes a first fastening hole 151, a plurality of first through holes arranged at equal intervals along a first direction, and a first fastener 153, wherein one end of the first fastener 153 passes through any one of the first through holes and is threadedly connected to the first fastening hole 151.

[0059] In some possible embodiments, see Figure 2 and Figure 3The first fastening hole 151 includes two; the first strip hole 152 includes two, the two first strip holes 152 correspond to the two first fastening holes 151 respectively, the two first strip holes 152 are spaced apart along the first direction and are located on opposite sides of the first limiting guide groove 1121; the first fastener 153 includes two, the two first fasteners 153 correspond to the two first fasteners 153 respectively.

[0060] Since the two first strip holes 152 are spaced apart along the first direction and located on opposite sides of the first limiting guide groove 1121, and correspond to the two first fastening holes 151, the two first fasteners 153 can provide fastening force on opposite sides of the first adjusting bracket 130, thereby enhancing the stability of the first adjusting bracket 130 in the mounting cavity 111, reducing the possibility of it shifting during adjustment or use, ensuring that the optical lens can be kept in an accurate position, and thus helping to improve the brightness and color uniformity of the projected image.

[0061] In addition, compared with a single first fastener 153, two first fasteners 153 can avoid the problem of excessive or insufficient local force on the first adjustment bracket 130, so that the first adjustment bracket 130 can be more stably maintained in the adjusted position after fastening, reducing the risk of deformation of the first adjustment bracket 130 or change in position of the first adjustment lens 140 due to uneven fastening force, thereby improving the reliability and stability of the optical adjustment structure 100.

[0062] In some possible embodiments, see Figure 2 and Figure 4 The first adjustment bracket 130 has a first positioning surface 132, which is the surface facing the back plate 112; the back plate 112 has a second positioning surface 1122 corresponding to the first positioning surface 132, and the second positioning surface 1122 is in close contact with the first positioning surface 132.

[0063] The first positioning surface 132 and the second positioning surface 1122 are both smooth surfaces, which can ensure the tightness of the fit between the first positioning surface 132 and the second positioning surface 1122 as much as possible.

[0064] Due to the tight fit between the first positioning surface 132 and the second positioning surface 1122, a precise positioning reference is provided for the installation of the first adjustment bracket 130 on the back plate 112. This surface-to-surface fit effectively restricts the degrees of freedom of the first adjustment bracket 130 in multiple directions, allowing it to be accurately installed in a preset position. This ensures the relative positional accuracy between the first adjustment lens 140 and the reference lens 120, which is beneficial for improving the brightness and color uniformity of the projected image. Furthermore, the tight fit between the first positioning surface 132 and the second positioning surface 1122 increases the contact area between the first adjustment bracket 130 and the back plate 112, making the connection between the two more stable.

[0065] In addition, the close fit between the first positioning surface 132 and the second positioning surface 1122 provides clear installation guidance when installing the first adjustment bracket 130, making the installation process simpler and faster.

[0066] In some possible embodiments, see Figure 5 and Figure 6 The optical adjustment structure 100 also includes a second adjustment bracket 160 and a second adjustment lens 170. The second adjustment bracket 160 is disposed in the mounting cavity 111 and can move relative to the back plate 112 in a first direction. The second adjustment lens 170 is disposed on the second adjustment bracket 160 and can adjust the distance between the second adjustment lens 170 and the reference lens 120 in the first direction when the second adjustment bracket 160 moves relative to the back plate 112 in the first direction.

[0067] The second adjustment bracket 160 is movably mounted on the back plate 112 and can also be movably mounted on the first adjustment bracket 130.

[0068] Since the second adjustment lens 170 is mounted on the second adjustment bracket 160, and the second adjustment bracket can move relative to the back plate 112 in the first direction, the second adjustment lens 170, the reference lens 120, and the first adjustment lens 140 form a "reference lens 120 + dual adjustment lens" combination structure. The distance between the first adjustment lens 140 and the second adjustment lens 170 and the reference lens 120 can be adjusted separately or in concert, thereby enabling the handling of more complex optical deviation scenarios. For example, for brightness / color differences in different areas of the image, precise compensation can be achieved by finely adjusting the positions of the first adjustment lens 140 and the second adjustment lens 170. Compared with a single adjustment lens, the ability to optimize the uniformity of the projected image is stronger.

[0069] In addition, the independent adjustment function of the second adjustment bracket 160 allows for a second fine calibration of the optical system after the first adjustment lens 140 has been adjusted to the correct position.

[0070] In some possible embodiments, see Figure 6 , Figure 7 and Figure 8 The first adjustment bracket 130 is provided with a second limiting guide groove 133, which extends along a first direction; the second adjustment bracket 160 is provided with a second protrusion 161, which is movably inserted into the second limiting guide groove 133; the optical adjustment structure 100 also includes a second fastening component 180, which is used to fasten the adjusted second adjustment bracket 160 to the first adjustment bracket 130.

[0071] Since the second limiting guide groove 133 extends along the first direction and the second protrusion 161 can be movably inserted therein, the second limiting guide groove 133 defines a unique direction for the movement of the second adjusting bracket 160. This structure can prevent the second adjusting bracket 160 from shifting laterally or shaking during the adjustment process, ensuring that the second adjusting lens 170 always moves along the theoretical path, avoiding optical deviation caused by the shift of the second adjusting lens 170, and providing a basis for accurately adjusting the distance between the second adjusting lens 170 and the reference lens 120.

[0072] In addition, the second adjustment bracket 160 cooperates with the second limiting guide groove 133 of the first adjustment bracket 130 through the second protrusion 161 to form a dual adjustment mode of "the first adjustment bracket 130 drives the second adjustment bracket 160 to move as a whole + the second adjustment bracket 160 moves independently relative to the first adjustment bracket 130". When adjusting the first adjustment bracket 130, the second adjustment bracket 160 can move synchronously along the first direction to achieve "coarse adjustment" of the distance between the second adjustment lens 170 and the reference lens 120. When adjusting the second adjustment bracket 160 alone, "fine adjustment" can be performed based on the first adjustment bracket 130. Compared with single independent adjustment, it can optimize optical parameters more efficiently and adapt to complex image uniformity requirements.

[0073] In some possible embodiments, see Figure 6 and Figure 7 The second fastening assembly 180 includes a second fastening hole 181, a second strip hole 182, and a second fastener 183. The second fastening hole 181 is disposed in the first adjusting bracket 130; the second strip hole is disposed in the second adjusting bracket 160, and the second strip hole 182 extends along a first direction; one end of the second fastener 183 passes through the second strip hole 182 and is threadedly connected to the second fastening hole 181.

[0074] Since the second strip hole 182 extends along the first direction, when the second fastener 183 passes through the second strip hole 182 and is threadedly connected to the second fastening hole 181, the second adjusting bracket 160 can move within a certain range in the first direction.

[0075] Furthermore, one end of the second fastener 183 passes through the second strip hole 182 and is threadedly connected to the second fastening hole 181. This threaded connection provides reliable fastening force, firmly fixing the second adjusting bracket 160 onto the first adjusting bracket 130. That is, once the first adjusting bracket 130 is adjusted to the appropriate position relative to the second adjusting bracket 160, tightening the second fastener 183 can prevent the second adjusting bracket 160 from shifting due to vibration, collision, or other factors during equipment operation, thus ensuring the stability and reliability of the optical system.

[0076] It should be noted that the second fastener 183 has a greater range of motion within the second slot 182 than the second protrusion 161 has a greater range of motion within the second limiting guide groove 133, in order to ensure the degree of freedom of the second adjusting bracket 160 to move in the second direction.

[0077] Of course, in some other embodiments, the second fastening assembly 180 includes a second fastening hole 181, a plurality of second through holes arranged at equal intervals along a second direction, and a second fastener 183, with one end of the second fastener 183 passing through any one of the second through holes and threadedly connected to the second fastening hole 181.

[0078] In some possible embodiments, see Figure 7 and Figure 8 The first adjustment bracket 130 also has a third positioning surface 134, which is a surface facing away from the back plate 112; the second adjustment bracket 160 has a fourth positioning surface 162 corresponding to the third positioning surface 134, which is in close contact with the third positioning surface 134.

[0079] The third positioning surface 134 and the fourth positioning surface 162 are both smooth surfaces, which can ensure the tightness of the fit between the third positioning surface 134 and the fourth positioning surface 162.

[0080] Because of the tight fit between the third positioning surface 134 and the fourth positioning surface 162, a clear reference surface is provided for the second adjustment bracket 160, restricting its degrees of freedom perpendicular to the first direction (such as up and down, left and right). Even when adjusting the second adjustment bracket 160, the surface contact fit prevents it from tilting or shifting, ensuring that the second adjustment lens 170 always moves along the first direction, avoiding optical deviations caused by misalignment of the second adjustment bracket 160, and providing a guarantee for precise control of the distance between the second adjustment lens 170 and the reference lens 120.

[0081] In addition, the first adjustment bracket 130 and the second adjustment bracket 160 are closely fitted together through the third positioning surface 134 and the fourth positioning surface 162, forming a stable "superimposed" structure. When the adjustment of the first adjustment bracket 130 drives the second adjustment bracket 160 to move as a whole, the two will not wobble relative to each other due to the gap. This stable linkage can reduce the error when the first adjustment bracket 130 and the second adjustment bracket 160 are adjusted together, ensuring that the distance change between the first adjustment lens 140 and the second adjustment lens 170 and the reference lens 120 always meets the expectations, and avoiding fluctuations in the uniformity of image brightness and color caused by looseness between the first adjustment bracket 130 and the second adjustment bracket 160.

[0082] For example, during the adjustment of the optical adjustment structure 100, other optical lenses are first adjusted so that the light beam can reach the position required by the imaging module through the center of the other optical lenses. Then, the positions of the other optical lenses are fixed, and the second adjustment bracket 160, which is equipped with the second adjustment lens 170, is placed on the first adjustment bracket 130, which is equipped with the first adjustment lens 140. Since the first protrusion 131 on the first adjustment bracket 130 is slidably disposed in the first limiting guide groove 1121 on the back plate 112, the first adjustment bracket 130 can ensure that the second adjustment bracket 160 slides smoothly and does not tilt during the process of the first adjustment bracket 130 driving the second adjustment bracket 160 to move in the first direction. Since the second protrusion 161 on the second adjustment bracket 160 is movably disposed in the second limiting guide groove 133, the second adjustment bracket 160 can be ensured to slide smoothly and does not tilt during the adjustment process.

[0083] Furthermore, after the first fastener 153 and the second fastener 183 are loosened, the first adjusting bracket 130 and the second adjusting bracket 160 can be adjusted accordingly. By observing the optical imaging state, the first adjusting bracket 130 can be adjusted first, such as... Figure 6 As shown, move it left or right along the first direction until the optical imaging state reaches the expected target. Secure it to the back plate 112 with the first fastener 153. Then adjust the second adjustment bracket 160 and observe the optical imaging state in the same way until the optical imaging state meets the expectation. Then lower and secure it to the first adjustment bracket 130 with the second fastener 183.

[0084] Finally, to ensure the continued reliability of the optical adjustment structure, the first adjustment bracket 130 and the second adjustment bracket 160 can be fixed by applying adhesive to prevent the first fastener 153 and the second fastener 183 from loosening.

[0085] It is evident that this substructure simplifies the optical adjustment structure, reduces the overall size of the projection device, and makes it easier to achieve high-precision fine-tuning of the combined optical lenses, thereby improving the user experience.

[0086] In some possible embodiments, see Figure 8 and Figure 9 The first adjusting bracket 130 is provided with a first adhesive groove 135; and / or the second adjusting bracket 160 is provided with a second adhesive groove 163.

[0087] Since the first adjustment bracket 130 is provided with a first glue groove 135, the first glue groove 135 can be used to fill glue. Through the adhesive effect of the glue, the first adjustment lens 140 can be more firmly connected to the first adjustment bracket 130, thereby preventing the first adjustment lens 140 from shifting during use and ensuring the stability and reliability of the optical system.

[0088] Similarly, since the second adjustment bracket 160 is provided with a second adhesive groove 163, the second adjustment lens 170 can be glued to the second adjustment bracket 160.

[0089] See Figure 10 This application also provides a projection device 200, which includes the optical adjustment structure 100 in the above embodiments.

[0090] Since the projection device 200 includes the light adjustment structure described in the above embodiments, the brightness and color uniformity of the projected image of the light projection device 200 can be improved.

[0091] Alternatively, the projection device 200 may include a light source, a light modulator, and a projection lens. The light source is disposed on the protective housing 110 for emitting incident light, the light modulator is disposed in the mounting cavity 111 for modulating the incident light to obtain an image beam, and the projection lens is used to project the image beam to form a projected image.

[0092] The light source mentioned above is a laser light source, which can be a monochromatic laser light source or a panchromatic laser light source. The light source includes a laser, which generates laser light. The laser can convert electrical energy into light energy and heat energy, and the light energy becomes laser light.

[0093] The aforementioned optical modulation devices include, but are not limited to, DMD (Digital Micromirror Device) and LCLV (Liquid Crystal Light Valve). In this application embodiment, DMD is mainly used as an example for illustration. DMD is a spatial light modulator that can achieve precise control of the optical path by rapidly controlling the deflection state of the micromirror array.

[0094] The aforementioned projection lenses include, but are not limited to, fixed-focus projection lenses, zoom projection lenses, and short-throw / ultra-short-throw lenses.

[0095] Therefore, through the coordinated work of the light source, light modulation device and optical lens, digital signals can be converted into high-quality projected images.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical adjustment structure (100), characterized in that, include: A protective shell (110) has an installation cavity (111) formed inside it. The protective shell (110) includes a back plate (112). The inner surface of the back plate (112) is provided with a first limiting guide groove (1121), which extends along a first direction. A reference lens (120) is fixedly disposed within the mounting cavity (111); A first adjusting bracket (130) is disposed in the mounting cavity (111). A first protrusion (131) is provided on the first adjusting bracket (130). The first protrusion (131) is movably disposed in the first limiting guide groove (1121) so that the first adjusting bracket (130) can move relative to the back plate (112) in the first direction. The first adjustment lens (140) is mounted on the first adjustment bracket (130). The first adjustment lens (140) and the reference lens (120) are opposite each other along the first direction. When the first adjustment bracket (130) moves in the first direction, it can adjust the distance between the first adjustment lens (140) and the reference lens (120) in the first direction. The first fastening assembly (150) is used to fasten the adjusted first adjusting bracket (130) to the back plate.

2. The optical adjustment structure (100) according to claim 1, characterized in that, The first fastening assembly (150) includes: The first fastening hole (151) is provided on the back plate (112). The first strip hole (152) is disposed on the first adjusting bracket (130); The first fastener (153) has one end passing through the first strip hole (152) and threadedly connected to the first fastening hole (151).

3. The optical adjustment structure (100) according to claim 2, characterized in that, The first fastening hole (151) includes two; The first strip hole (152) includes two, and the two first strip holes (152) correspond to the two first fastening holes (151) respectively. The two first strip holes (152) are spaced apart along the first direction and are located on opposite sides of the first limiting guide groove (1121). The first fastener (153) includes two, and the two first fasteners (153) correspond to the two first fasteners (153) respectively.

4. The optical adjustment structure (100) according to claim 1, characterized in that, The first adjustment bracket (130) has a first positioning surface (132), which is the surface facing the back plate (112); The back plate (112) has a second positioning surface (1122) corresponding to the first positioning surface (132), and the second positioning surface (1122) is in close contact with the first positioning surface (132).

5. The optical adjustment structure (100) according to claim 1, characterized in that, The optical adjustment structure (100) further includes: The second adjustment bracket (160) is disposed in the mounting cavity (111) and is movable relative to the back plate (112) in the first direction. The second adjustment lens (170) is disposed on the second adjustment bracket (160). When the second adjustment bracket (160) moves relative to the back plate (112) along the first direction, it can adjust the distance between the second adjustment lens (170) and the reference lens (120) in the first direction.

6. The optical adjustment structure (100) according to claim 5, characterized in that, The first adjusting bracket (130) is provided with a second limiting guide groove (133), which extends along the first direction; The second adjustment bracket (160) is provided with a second protrusion (161), which is movably inserted into the second limiting guide groove (133). The optical adjustment structure (100) further includes a second fastening component (180), which is used to fasten the adjusted second adjustment bracket (160) to the first adjustment bracket (130).

7. The optical adjustment structure (100) according to claim 6, characterized in that, The second fastening assembly (180) includes: The second fastening hole (181) is provided on the first adjusting bracket (130); The second strip hole (182) is disposed on the second adjusting bracket (160) and extends along the first direction; The second fastener (183) has one end threaded through the second strip hole (182) and connected to the second fastening hole (181).

8. The optical adjustment structure (100) according to claim 6, characterized in that, The first adjustment bracket (130) also has a third positioning surface (134), which is a surface facing away from the back plate (112); The second adjusting bracket (160) has a fourth positioning surface (162) corresponding to the third positioning surface (134), and the fourth positioning surface (162) is in close contact with the third positioning surface (134).

9. The optical adjustment structure (100) according to claim 5, characterized in that, The first adjusting bracket (130) is provided with a first adhesive groove (135); and / or, The second adjustment bracket (160) is provided with a second glue groove (163).

10. A projection device (200), characterized in that, Includes the optical adjustment structure (100) as described in any one of claims 1-9.

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