DMD mounting structure, projection light machine and imaging device

Abstract

The application provides a DMD mounting structure, a projection light machine and an imaging device, which comprise a light machine shell and a DMD. The light machine shell is provided with a containing cavity for mounting the DMD. The containing cavity has a first long side and a second long side, and a first short side and a second short side. The containing cavity has a bottom wall. The bottom wall close to the first short side and the second short side is respectively provided with a first positioning structure and a second positioning structure. The DMD is respectively provided with a first matching structure and a second matching structure. The first positioning structure and the first matching structure are matched, and the second positioning structure and the second matching structure are matched to position the DMD. The DMD mounting structure comprises a hard pressing part and a hard elastic part. The hard pressing part is abutted at a corner of the DMD. The side away from the DMD comprises an inclined surface. One end of the hard elastic part is fixed on or abutted on the light machine shell. The other end of the hard elastic part is elastically abutted on the inclined surface. A first hard gasket is arranged between the bottom wall and the DMD. The DMD is in contact with the first hard gasket. When the DMD reciprocates, the consistency of imaging before and after the movement of the DMD can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of projection equipment, in particular to a DMD mounting structure, a projection light machine and an imaging equipment. BACKGROUND

[0002] A digital micro-mirror device (DMD) is one of the core components of an imaging equipment. At present, imaging equipment using a DMD has been widely used in splicing display, 3D printing, 3D measurement and other application scenarios. The DMD is usually positioned by setting a silica gel column in a shell to support the DMD.

[0003] During operation, the DMD needs to process light emitted by an optical illumination system, and heat will be generated after the light irradiation. The DMD itself will move due to thermal expansion and contraction, and the aging of silica gel during use will make the reciprocating movement of the DMD uncontrollable, resulting in poor imaging consistency of the imaging equipment during use. SUMMARY

[0004] Based on the above status, the main purpose of the present application is to provide a DMD mounting structure, a projection light machine and an imaging equipment.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A DMD mounting structure, comprising a light machine shell and a DMD, the light machine shell is provided with a containing cavity, the DMD is installed in the containing cavity, the containing cavity and the DMD are rectangular, the containing cavity has opposite first and second long sides and opposite first and second short sides;

[0007] The containing cavity has a bottom wall, the first and second short sides of the bottom wall are respectively provided with first and second positioning structures, the two sides of the DMD in the first and second short sides are respectively provided with first and second matching structures, the first positioning structure and the first matching structure are matched, the second positioning structure and the second matching structure are matched to position the DMD;

[0008] The DMD mounting structure further comprises a hard pressing piece and a hard elastic piece, the hard pressing piece is accommodated in the accommodating cavity, the hard pressing piece is abutted against the corner of the DMD near the side of the DMD, the side away from the DMD comprises an inclined surface towards the corner of the accommodating cavity, one end of the hard elastic piece is fixed on or abutted against the optical engine shell, the other end is elastically abutted against the inclined surface, the force applied by the hard elastic piece on the hard pressing piece is decomposed into forces parallel to the first long side and the first short side by the hard pressing piece and acts on the DMD;

[0009] A first hard gasket is arranged between the bottom wall and the DMD, and the surface of the DMD near the bottom wall is in contact with the first hard gasket.

[0010] Preferably, the hard elastic piece is fixedly connected with the optical engine shell outside the optical engine shell, and the hard elastic piece penetrates through the optical engine shell and is abutted against the inclined surface at one end.

[0011] Preferably, the hard elastic piece comprises a connecting plate, a fixed column and an elastic part, and the fixed column and the elastic part are connected through the connecting plate.

[0012] An installation hole is formed on the connecting plate, the fixed column penetrates through the installation hole and is fixed with the optical engine shell, one end of the elastic part is fixedly connected with the connecting plate, and the other end penetrates through the optical engine shell and is elastically abutted against the inclined surface.

[0013] The end of the hard elastic piece in contact with the inclined surface is in a ball head structure.

[0014] Preferably, the elastic part comprises a mounting seat fixed to the connecting plate, a guide column is arranged on the side of the mounting seat away from the connecting plate, a spring is sleeved on the guide column, one end of the spring is abutted against the mounting seat, the other end is fixed with a boss, an extension column is fixed on the side of the boss away from the spring, and the extension column extends into the accommodating cavity to apply an elastic force to the hard elastic piece.

[0015] Preferably, the length-width ratio of the DMD and the accommodating cavity ranges from 1:1 to 3:1.

[0016] The angle between the end of the hard elastic piece penetrating through the optical engine shell and the first long side is 30°-60°, the angle between the inclined surface and the first long side is 20°-70°, and the extension line of the end of the hard elastic piece penetrating through the optical engine shell passes through the corner abutted by the hard pressing piece.

[0017] Preferably, the extension line of the end of the hard elastic piece penetrating through the optical engine shell passes through the corner abutted by the hard pressing piece and the corner towards which the inclined surface is directed.

[0018] An angle between one end of the hard elastic member penetrating the light engine shell and the first long side is 45°, and an angle between the inclined surface and the first long side is 60°.

[0019] Preferably, the hard pressing member includes an inner side surface perpendicular to the first hard gasket, the inclined surface, and first and second surfaces parallel to the first hard gasket, the first and second surfaces being connected by the inner side surface on a side close to the DMD, the inner side surface matching the shape of the corner it abuts, and the first and second surfaces being connected by the inclined surface on a side away from the DMD.

[0020] Preferably, the hard pressing member includes a first part and a second part formed integrally, the first and second parts being in contact with two sides of the corner intersecting to form the corner against which the hard pressing member abuts, wherein one of the first and second parts is provided with an anti-fool structure.

[0021] Preferably, the first and second positioning structures are positioning platforms, and the first and second cooperating structures are positioning grooves, and in the installed state, the positioning platforms are accommodated in the positioning grooves.

[0022] The positioning platform away from the hard pressing member is a first positioning platform, and the positioning platform close to the hard pressing member is a second positioning platform; the positioning groove away from the hard pressing member is a first positioning groove, and the positioning groove close to the hard pressing member is a second positioning groove.

[0023] The first positioning platform is rotatable within a certain angle relative to the first positioning groove.

[0024] Preferably, the DMD mounting structure further includes a second hard gasket, the second hard gasket being arranged between a side of the second positioning platform close to the hard pressing member and a side wall of the second positioning groove, and being perpendicular to the direction of the second short side.

[0025] Preferably, the second hard gasket extends from the second positioning groove into the accommodating cavity, and a soft pad is arranged between the hard pressing member and the part of the second hard gasket extending into the accommodating cavity.

[0026] An end of the second hard gasket away from the second positioning groove is provided with a tool withdrawal groove below.

[0027] Preferably, the first and second hard gaskets are both smooth metal materials.

[0028] Preferably, a light passing area is formed in the center of the bottom of the accommodating cavity, and the size of the light passing area in the first long side direction and the first short side direction is smaller than the size of the accommodating cavity.

[0029] To better solve the above technical problems, the application further provides a projection light machine, which comprises the DMD mounting structure.

[0030] To better solve the above technical problems, the application further provides an imaging device, which comprises a shell, and the shell contains the DMD mounting structure.

[0031] Preferably, the imaging device is a 3D scanner, a 3D printer or a projector.

[0032] The application has the beneficial effects that: the DMD is preliminarily positioned by the cooperation of the positioning structure and the cooperation structure of the DMD, the hard pressing part is arranged at the corner of the DMD, the hard elastic part is elastically arranged on the inclined surface of the hard pressing part away from the DMD, the force applied on the hard pressing part is divided into two directions, which are parallel to the first long side and the first short side, and acts on the DMD to position the DMD, and the first hard gasket is arranged between the DMD and the bottom wall, the consistency and smoothness of the DMD in thermal expansion and contraction movement are improved by the above structure, because the hard pressing part and the hard elastic part, the DMD and the hard pressing part, and the DMD and the first hard gasket are all hard contact, the resilience is stable and controllable, and is not easy to age.

[0033] Other beneficial effects of the application will be described in the specific embodiments by the introduction of specific technical features and technical solutions, and the person skilled in the art should understand the beneficial technical effects brought by the technical features and technical solutions through the introduction. BRIEF DESCRIPTION OF DRAWINGS

[0034] The preferred embodiment of the DMD mounting structure according to the application will be described below with reference to the accompanying drawings. In the drawings:

[0035] Figure 1 The structure schematic view of the DMD mounting structure provided by the application is shown in the shell of the projection light machine.

[0036] Figure 2 The local structure schematic view of the DMD mounting structure provided by the application is shown in the DMD.

[0037] Figure 3 The explosion structure schematic view of the first hard gasket of the DMD mounting structure provided by the application is shown.

[0038] Figure 4A cross-sectional view of a DMD mounting structure according to the present application showing a second hard gasket position.

[0039] Figure 5 A cross-sectional view of a DMD mounting structure according to the present application showing a first hard gasket position. Figure 4 An enlarged view of a portion A of the DMD mounting structure according to the present application.

[0040] Figure 6 A structural view of a DMD mounting structure according to the present application showing a hard pressing member.

[0041] Figure 7 A structural view of a DMD mounting structure according to the present application showing a hard elastic member.

[0042] Figure 8 A structural view of a DMD mounting structure according to the present application showing another end of a hard elastic member.

[0043] BRIEF DESCRIPTION OF DRAWINGS: 1, optical engine housing; 11, accommodating cavity; 111, first long side; 112, second long side; 113, first short side; 114, second short side; 1141, second hard gasket; 1142, soft gasket; 1143, tool withdrawal groove; 115, light passing region; 116, bottom wall; 1161, first hard gasket; 13, first positioning structure; 131, first positioning platform; 14, second positioning structure; 141, second positioning platform; 2, DMD; 21, first mating structure; 211, first positioning groove; 22, second mating structure; 221, second positioning groove; 3, hard pressing member; 31, inclined surface; 32, inner side surface; 33, first surface; 34, second surface; 35, first portion; 36, second portion; 37, fool-proof structure; 4, hard elastic member; 41, connecting plate; 42, fixing column; 43, elastic portion; 431, mounting seat; 432, guide column; 433, spring; 434, boss; 435, extension column. DETAILED DESCRIPTION

[0044] The present application is described herein below based on examples, but the present application is not limited only to these examples. In the following detailed description of the present application, some specific details are described in detail in order to avoid obscuring the essence of the present application, and well-known methods, procedures, processes, elements, etc. are not described in detail.

[0045] In addition, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0046] Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

[0047] In the description of the present application, it should be understood that the terms "first", "second" and the like are used only for descriptive purposes and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0048] The present application provides a DMD mounting structure, referring to Figure 1 and Figure 2 , the DMD mounting structure comprises an optical machine shell 1, a DMD 2, a hard pressing piece 3 and a hard elastic piece 4, the DMD 2 is installed in the optical machine shell 1, the hard pressing piece 3 abuts against the DMD 2, one end of the hard elastic piece 4 is fixed on or abuts against the optical machine shell 1, and the other end of the hard elastic piece 4 applies elastic force to the hard pressing piece 3. The optical machine shell 1 is used for protecting the DMD 2 so that it is not easy to be damaged, and the hard pressing piece 3 and the hard elastic piece 4 are used for positioning the DMD 2 in the optical machine shell 1 and can satisfy the free movement of the DMD 2 under thermal expansion and contraction.

[0049] Referring to Figure 3 , the optical machine shell 1 is provided with a containing cavity 11, and the DMD 2 is installed in the containing cavity 11. The DMD 2 and the containing cavity 11 are both approximately rectangular. Specifically, the approximately rectangular means that the DMD 2 and the containing cavity 11 both have four sides and corners formed by the intersection of the four sides, but the four sides of the DMD 2 and the containing cavity 11 are allowed to be provided with grooves or protruding structures, and the right angles at the corners can also be chamfered as needed. The edges can be straight lines or curves or broken lines. In short, the outer contour is approximately rectangular.

[0050] Referring to Figure 3 , the containing cavity 11 has a first long side 111 and a second long side 112, and opposite first and second short sides 113 and 114. A light transmission area 115 is provided in the center of the bottom of the containing cavity 11. The size of the light transmission area 115 in the direction of the first long side 111 and the direction of the first short side 113 is smaller than the size of the containing cavity 11. The light transmission area 115 is used to transmit light to the DMD 2, so that the DMD 2 can receive light in the optical machine shell 1 and work.

[0051] The containing cavity 11 has a bottom wall 116, and a first hard gasket 1161 is arranged between the bottom wall 116 and the DMD 2. The surface of the DMD 2 close to the bottom wall 116 is in contact with the first hard gasket 1161. The first hard gasket 1161 is formed of a hard and smooth surface material. Specifically, a hard metal material with a smooth surface such as stainless steel can be used, or other hard non-metal materials with a smooth surface such as ceramic and tempered glass can be used, which can reduce the friction between the DMD 2.

[0052] Referring to Figure 4The first positioning structure 13 and the second positioning structure 14 are respectively arranged on the bottom wall 116 of the accommodating cavity 11 close to the first short side 113 and the second short side 114, and are used for positioning the DMD 2.

[0053] With reference to Figure 4 The first positioning structure 13 and the first cooperation structure 21 cooperate, and the second positioning structure 14 and the second cooperation structure 22 cooperate to position the DMD 2. The first positioning structure 13 and the second positioning structure 14 are positioning tables, the first cooperation structure 21 and the second cooperation structure 22 are positioning grooves, and in the installed state, the positioning tables are accommodated in the positioning grooves.

[0054] With reference to Figure 4 The positioning table far away from the hard pressing part 3 is a first positioning table 131, and the positioning table close to the hard pressing part 3 is a second positioning table 141. The positioning groove far away from the hard pressing part 3 is a first positioning groove 211, and the positioning groove close to the hard pressing part 3 is a second positioning groove 221. The first positioning table 131 is rotatable within a certain angle relative to the first positioning groove 211, and the second positioning table 141 and the second positioning groove 221 are both arranged in a rectangular shape. When the temperature of the DMD 2 changes and thermal expansion and cold contraction occur, since the first positioning table 131 is rotatable within a certain angle relative to the first positioning groove 211, the freedom of deformation of the DMD 2 due to thermal expansion and cold contraction can be improved, and the DMD 2 can deform and move with the first positioning table 131 as the axis, the general direction of thermal expansion and cold contraction of the DMD 2 can be limited, and the consistency of the movement of the DMD 2 due to thermal expansion and cold contraction is good.

[0055] With reference to Figure 5 The DMD mounting structure further comprises a second hard gasket 1141. The second hard gasket 1141 is arranged between the side of the second positioning table 141 close to the hard pressing part 3 and the side wall of the second positioning groove 221, and is perpendicular to the second short side 114. As an embodiment, the second hard gasket 1141 is formed of a hard and smooth surface material. For example, a hard metal material with a smooth surface such as stainless steel can be used, or other hard non-metal materials with a smooth surface such as ceramic and tempered glass can be used, which can all reduce the friction of the movement of the DMD 2, so that the DMD 2 can move more freely.

[0056] The cooperation of the positioning table and the positioning groove can preliminarily position the DMD 2, facilitate further positioning of the DMD 2, and the first positioning table 131 and the first positioning groove 211 can relatively rotate, so that the free movement of the DMD 2 due to thermal expansion and cold contraction can be met, and the first hard gasket 1161 and the second hard gasket 1141 can improve the smoothness of the movement of the DMD 2.

[0057] As an embodiment, the specific shape of the positioning groove and the positioning platform is not limited, and the positioning groove and the positioning platform can cooperate with the preliminary positioning of the DMD 2. The position of the relative rotation of the positioning platform and the positioning groove can change with the position of the hard pressing piece 3. The positioning platform away from the hard pressing piece 3 can be relatively rotated with the positioning groove.

[0058] As an embodiment, the second hard gasket 1141 is not necessarily arranged in the DMD mounting structure. The DMD 2 can also move freely under the thermal expansion and cold contraction. However, after the second hard gasket 1141 is added, the friction force borne by the DMD 2 during movement is smaller.

[0059] As an embodiment, referring to Figure 5 , the second hard gasket 1141 extends from the second positioning groove 221 to the accommodating cavity 11. The soft gasket 1142 is arranged between the hard pressing piece 3 and the part of the second hard gasket 1141 extending to the accommodating cavity 11. The retreat groove 1143 is arranged below the end of the second hard gasket 1141 away from the second positioning groove 221.

[0060] The soft gasket 1142 can position the second hard gasket 1141, so as to avoid the second hard gasket 1141 from falling off due to the movement of the DMD 2.

[0061] As an embodiment, the soft gasket 1142 can be omitted. However, the arrangement of the gasket 1142 can stabilize the position of the second hard gasket 1141, so as to facilitate the reciprocating movement of the DMD.

[0062] Since the second hard gasket 1141 needs to be fixed in the accommodating cavity 11, the second hard gasket 1141 cannot be completely positioned by only the soft gasket 1142. A plane needs to be arranged at the end of the second hard gasket 1141 away from the DMD in the planar direction, so as to abut against the second hard gasket 1141 and avoid the sliding of the second hard gasket 1141. When machining the plane, since the position and size of the position are small, and the cross section of the machining tool is circular, the retreat groove is inevitably left when the plane for positioning the second hard gasket 1141 is machined. It can be understood that, according to different machining methods, for example, the machine shell 1 is integrally injection molded, the retreat groove 1143 can not be arranged.

[0063] As an embodiment, referring to Figure 5, the hard pressing piece 3 is accommodated in the accommodating cavity 11, and the side close to the DMD 2 abuts against the corner of the DMD 2, and the side away from the DMD 2 comprises an inclined surface 31 towards the corner of the accommodating cavity 11, the hard elastic piece 4 penetrates the light machine shell 1 and abuts against the inclined surface 31 at one end, the force exerted by the hard elastic piece 4 on the hard pressing piece 3 is decomposed into forces parallel to the first long side 111 and the first short side 113, and acts on the DMD 2, thereby playing a positioning role on the DMD 2.

[0064] As an embodiment, referring to Figure 5 and Figure 6 , the hard pressing piece 3 comprises an inner side surface 32 perpendicular to the first hard gasket 1161, the inclined surface 31, and the first surface 33 and the second surface 34 parallel to the first hard gasket 1161, the first surface 33 and the second surface 34 are connected by the inner side surface 32 on the side close to the DMD 2, the shape of the inner side surface 32 matches the shape of the corner of the DMD 2 abutting against, and the first surface 33 and the second surface 34 are connected by the inclined surface 31 on the side away from the DMD 2.

[0065] As an embodiment, the aspect ratio of the DMD 2 and the accommodating cavity 11 ranges from 1:1 to 3:1, the angle between the end of the hard elastic piece 4 penetrating the light machine shell 1 and the first long side 111 ranges from 30° to 60°, the angle here is the smallest angle between the end of the hard elastic piece 4 penetrating the light machine shell 1 and the first long side 111, the angle between the inclined surface 31 and the first long side 111 ranges from 20° to 70°, the angle here is the smallest angle between the inclined surface 31 and the first long side 111. The angle between the end of the hard elastic piece 4 penetrating the light machine shell 1 and the first long side 111 is preferably 45°, and the angle between the inclined surface 31 and the first long side 111 is preferably 60°. The extension line of the end of the hard elastic piece 4 penetrating the light machine shell 1 passes through the corner abutting against by the hard pressing piece 3, which can improve the positioning effect on the DMD 2 and facilitate the reciprocating movement of the DMD 2 due to thermal expansion and cold contraction.

[0066] As an embodiment, the angle between the end of the hard elastic piece 4 penetrating the light machine shell 1 and the first long side 111 and the angle between the inclined surface 31 and the first long side 111 are not necessarily in the above-mentioned range, and the values of the two can change according to the specific installation position of the DMD 2 in the light machine shell 1 and the change of the aspect ratio of the rectangle.

[0067] As an embodiment, the hard pressing piece 3 comprises a first part 35 and a second part 36 which are integrally formed, the first part 35 and the second part 36 are respectively in contact with two sides of the corner of the light engine shell 1 where the DMD 2 abuts, and one of the first part 35 and the second part 36 is provided with an anti-fumble structure 37. In order to make the DMD 2 move better, the angle between the inclined surface 31 of the hard pressing piece 3 and the first long side 111 needs to be limited, so the first part 35 and the second part 36 cannot be installed upside down, and the anti-fumble structure 37 can facilitate accurate identification of the first part 35 and the second part 36 and speed up the installation efficiency.

[0068] As an embodiment, the anti-fumble structure 37 can be provided on the first part 35 or the second part 36 to achieve the anti-fumble effect, and the anti-fumble structure 37 can be a groove, a hole, a protrusion, but is not limited to this (the groove is taken as an example in the figure), and those skilled in the art can replace the appropriate anti-fumble structure 37 according to the structure and installation position of the light engine shell 1 and the DMD 2. It can be understood that the anti-fumble structure 37 can not be provided in the present application, and the first part and the second part can also be distinguished according to the angle between the inclined surface 31 and the first long side 111, but the anti-fumble structure 37 can speed up the installation speed and reduce the installation difficulty.

[0069] Referring to Figure 4 and Figure 7 , the hard elastic piece 4 comprises a connecting plate 41, a fixed column 42 and an elastic part 43, the fixed column 42 and the elastic part 43 are connected through the connecting plate 41; the connecting plate 41 is provided with a mounting hole, the fixed column 42 passes through the mounting hole and is fixed to the light engine shell 1; one end of the elastic part 43 is fixedly connected to the connecting plate 41, and the other end penetrates through the light engine shell 1 and elastically abuts against the inclined surface 31, and the end of the hard elastic piece 4 in contact with the inclined surface 31 is in a ball head structure.

[0070] As an embodiment, the elastic part 43 comprises a mounting seat 431 fixed to the connecting plate 41, a guide column 432 and a spring 433 are fixed to the side of the mounting seat 431 away from the connecting plate 41, the guide column 432 and the spring 433 are coaxially arranged, the spring 433 is sleeved on the guide column 432 and one end of the spring 433 abuts against the lower surface of the mounting seat 431, a boss 434 is fixed to the end of the spring 433 away from the mounting seat 431, an extension column 435 is fixed to the side of the boss 434 away from the spring 433, and the extension column 435 extends into the accommodating cavity 11 and applies an elastic force to the hard pressing piece 3.

[0071] The elastic part 43 can be a spring plunger, the hard elastic member 4 and the hard pressing member 3 are made of hard material, the contact between the hard pressing member 4 and the hard elastic member 3 and the contact between the hard pressing member 3 and the DMD 2 are hard contacts, the DMD 2 can be positioned in two directions parallel to the first long side 111 and the first short side 113, and when the DMD 2 is subjected to thermal expansion and contraction, the DMD 2 can be allowed to stably move when subjected to thermal expansion and contraction, the reciprocating movement is good, that is, when thermal expansion and contraction occurs at different times, the movement tends to be consistent. The structure of the ball head can reduce the contact area between the hard elastic member 4 and the inclined surface 31, and reduce the resistance of the DMD 2 to thermal expansion and contraction movement.

[0072] Referring to Figure 7 , one end of the hard elastic member 4 in contact with the inclined surface 31 can be provided with an arc-shaped surface to form a ball head structure, or other structures, referring to Figure 8 , the hard elastic member 4' includes a connecting rod 41', a fixed column 42' and an elastic part 43', and the difference is that the end of the elastic part 43' is a tapered structure. It can be understood that the end of the hard elastic member 4 extending into the accommodating cavity 11 is in point contact with the inclined surface 31, which can meet the movement of the DMD 2 subjected to thermal expansion and contraction.

[0073] It can be understood that the present application provides a DMD mounting structure, which comprises a light machine shell and a DMD, the light machine shell is provided with an accommodating cavity, and the DMD is mounted in the accommodating cavity, characterized in that: the accommodating cavity and the DMD are similar to rectangles, the accommodating cavity has opposite first and second long sides and opposite first and second short sides.

[0074] The accommodating cavity has a bottom wall, and the first and second short sides of the bottom wall are respectively provided with first and second positioning structures, and the two sides of the DMD in the first and second short side directions are respectively provided with first and second matching structures, and the first and second positioning structures and the first and second matching structures are matched to position the DMD.

[0075] The DMD mounting structure further comprises a hard pressing member and a hard elastic member, the hard pressing member is accommodated in the accommodating cavity, the hard pressing member abuts against the corner of the DMD on the side close to the DMD, and the side away from the DMD comprises an inclined surface towards the corner of the accommodating cavity, one end of the hard elastic member is fixed on or abuts against the light machine shell, and the other end elastically abuts against the inclined surface, the force exerted by the hard elastic member on the hard pressing member is decomposed by the hard pressing member into forces parallel to the first long side and the first short side, and acts on the DMD.

[0076] A first hard gasket is arranged between the bottom wall and the DMD, and a surface of the DMD close to the bottom wall is in contact with the first hard gasket.

[0077] In a second aspect, the present application also provides a projection light machine, which comprises the DMD mounting structure.

[0078] In a third aspect, the present application also provides an imaging device, which comprises a housing, and the housing contains the DMD mounting structure. The imaging device can be a 3D scanner, a 3D printing device or a projector. In the current imaging device, the movement consistency of the DMD under thermal expansion and contraction is poor when the DMD is cooled, which will cause certain errors in the working imaging of the DMD. Such errors are not obvious in the daily projection of the projection device, but when used in the 3D scanner, the 3D printing device and other devices with high precision requirements (sensitive to temperature), such errors will affect the working results of the 3D scanner, the 3D printing device and other devices. By using the imaging device provided by the present application, the DMD is positioned by the hard elastic member and the hard pressing member, so that the DMD can move freely under thermal expansion and contraction, and the hard elastic member is not easy to deform and the controllability of the elastic force is high, which can improve the movement consistency of the DMD and eliminate the errors caused by the thermal expansion and contraction of the DMD.

[0079] It is understood by those skilled in the art that the above-mentioned preferred schemes can be freely combined and superimposed without conflict.

[0080] It should be understood that the above-mentioned embodiments are only exemplary and not limiting, and those skilled in the art can make various obvious or equivalent modifications or replacements to the above-mentioned details without departing from the essential principles of the present application, which shall be included in the scope of the claims of the present application.

Claims

1. A DMD mounting structure comprising a light engine case and a DMD, the light engine case having a receiving cavity, the DMD being mounted in the receiving cavity, characterized in that: The accommodating cavity and the DMD are rectangular, the accommodating cavity has opposite first and second long sides and opposite first and second short sides; The accommodating cavity has a bottom wall, the bottom wall near the first and second short sides is respectively provided with a first and second positioning structure, the DMD is respectively provided with a first and second matching structure on the two sides in the first and second short side direction, the first and second positioning structures and the first and second matching structures are matched to position the DMD; The DMD mounting structure further comprises a hard pressing piece and a hard elastic piece, the hard pressing piece is accommodated in the accommodating cavity, the hard pressing piece abuts against the corner of the DMD near the side of the DMD, and the side away from the DMD comprises an inclined surface towards the corner of the accommodating cavity, one end of the hard elastic piece is fixed on or abuts against the optical machine shell, and the other end elastically abuts against the inclined surface, the force exerted by the hard elastic piece on the hard pressing piece is decomposed into forces parallel to the first long side and the first short side direction and acts on the DMD; A first hard gasket is arranged between the bottom wall and the DMD, and the surface of the DMD near the bottom wall is in contact with the first hard gasket.

2. The DMD mounting structure according to claim 1, wherein: The hard elastic piece is fixedly connected with the optical machine shell outside the optical machine shell, and the hard elastic piece penetrates through the optical machine shell and abuts against the inclined surface at one end.

3. The DMD mounting structure according to claim 2, wherein: The hard elastic piece comprises a connecting plate, a fixed column and an elastic part, and the fixed column and the elastic part are connected through the connecting plate; The connecting plate is provided with a mounting hole, the fixed column penetrates through the mounting hole and is fixed with the optical machine shell, one end of the elastic part is fixedly connected with the connecting plate, and the other end penetrates through the optical machine shell and elastically abuts against the inclined surface; The end of the hard elastic piece in contact with the inclined surface is in a ball head structure.

4. The DMD mounting structure according to claim 2, wherein: The length-width ratio of the DMD and the accommodating cavity ranges from 1:1 to 3:1; The angle between the end of the hard elastic piece penetrating through the optical machine shell and the first long side is 30°-60°, the angle between the inclined surface and the first long side is 20°-70°, and the extension line of the end of the hard elastic piece penetrating through the optical machine shell passes through the corner abutted by the hard pressing piece.

5. The DMD mounting structure according to claim 2, wherein: The extension line of the end of the hard elastic piece penetrating through the optical machine shell passes through the corner abutted by the hard pressing piece and the corner towards which the inclined surface faces; The angle between the end of the hard elastic piece penetrating through the optical machine shell and the first long side is 45°, and the angle between the inclined surface and the first long side is 60°.

6. The DMD mounting structure according to Claim 1, wherein: The hard pressing piece includes an inner side surface perpendicular to the first hard gasket, the inclined surface, and a first surface and a second surface parallel to the first hard gasket, the first surface and the second surface are connected by the inner side surface on the side close to the DMD, the shape of the inner side surface matches the shape of the corner it abuts against, and the first surface and the second surface are connected by the inclined surface on the side away from the DMD.

7. The DMD mounting structure of claim 6, wherein: The hard pressing piece includes a first part and a second part formed integrally, the first part and the second part are in contact with two sides of the corner that intersect to form the corner abutting against the hard pressing piece, and one of the first part and the second part is provided with an anti-fool structure.

8. The DMD mounting structure according to Claim 1, wherein: The first positioning structure and the second positioning structure are positioning platforms, and the first matching structure and the second matching structure are positioning grooves, and in the mounted state, the positioning platforms are accommodated in the positioning grooves. The positioning platform away from the hard pressing piece is a first positioning platform, and the positioning platform close to the hard pressing piece is a second positioning platform; the positioning groove away from the hard pressing piece is a first positioning groove, and the positioning groove close to the hard pressing piece is a second positioning groove. The first positioning platform is rotatable within a certain angle relative to the first positioning groove.

9. The DMD mounting structure according to Claim 8, wherein: The DMD mounting structure further includes a second hard gasket, which is arranged between the side of the second positioning platform close to the hard pressing piece and the side wall of the second positioning groove, and is perpendicular to the second short side direction.

10. The DMD mounting structure according to Claim 9, wherein: The second hard gasket extends from the second positioning groove into the accommodating cavity, and a soft pad is arranged between the hard pressing piece and the part of the second hard gasket extending into the accommodating cavity. An undercut is arranged below the end of the second hard gasket away from the second positioning groove.

11. The DMD mounting structure according to Claim 9, wherein: The first hard gasket and the second hard gasket are both smooth metal materials.

12. The DMD mounting structure according to Claim 1, wherein: A light passage is arranged in the center of the bottom of the accommodating cavity, and the size of the light passage in the first long side direction and the first short side direction is smaller than the size of the accommodating cavity.

13. A projection light engine, characterized by: The projection light machine includes the DMD mounting structure according to any one of claims 1-12.

14. An image forming apparatus comprising a housing, characterized by: The housing accommodates the DMD mounting structure according to any one of claims 1-12.

15. The imaging device of claim 14, wherein: The imaging device is a 3D scanner, a 3D printer, or a projector.

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