Projection optical machine, projection device and 3D measurement device

Abstract

The present invention provides a projection optical machine, a projection device and a 3D measurement device, which include an optical machine housing, a lens module and a DMD module. The optical machine housing has a first side wall and a second side wall. The first side wall is provided with a DMD positioning surface, and a DMD mounting hole is provided on the DMD positioning surface. A lens hole and mounting grooves are provided on the second side wall. There are four mounting grooves, and each mounting groove is provided with a locking hole. The lens module includes a lens barrel, and the lens barrel includes a barrel body and a mounting flange connected to the barrel body. The mounting flange includes a flange body and four pressing bosses, and through holes are provided on the pressing bosses. The four pressing bosses are inserted into the four mounting grooves one by one. The projection optical machine further includes a plurality of metal gaskets and four locking members. Without disassembling the lens module and without additionally adding a dedicated adjustment structure, the metal gaskets can be taken out and replaced, so as to realize the adjustment of the flat field and back focus in the optical path, and it can be applied to a micro projector for high-precision measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of DLP projection, and particularly to a projection optical machine, a projection device, and a 3D measurement device. Background Art

[0002] A projection optical machine is a commonly used projection component. When used in a projection device, it can project images or videos onto a screen or a wall, and can be widely used in homes, offices, schools, entertainment venues, etc.; it can also be used in 3D measurement devices to obtain the precise dimensions of the object to be measured through projection. In order to improve the picture quality projected by the projection optical machine, high requirements are imposed on the flat field adjustment of the optical system (i.e., the perpendicularity of the actual optical axis of the lens relative to the DMD scaly surface) and the back focal position, etc. However, errors inevitably exist in manufacturing and assembly. Therefore, adjustments are often required during assembly.

[0003] In the prior art, an adjustment gasket with an adhesive is provided between the optical machine housing and the DMD module to compensate for the inclination of each optical lens, DMD device, prism module, lens module, etc. relative to the optical axis. At the same time, the lens module is set to an adjustable structure with a relatively sliding inner cylinder and outer cylinder, even in a fixed-focus projection optical machine. Then, the outer cylinder is directly fixed to the optical machine housing, and the position of the back focus is adjusted by adjusting the relative position of the inner cylinder relative to the outer cylinder.

[0004] However, the above adjustment of the back focus still requires a double-layer lens barrel to be set, with a complex structure, increasing the volume and mass of the whole machine; after using the adjustment gasket with an adhesive in the adjustment of the inclination of the optical elements, due to the high heat generated at the DMD during later use, it is extremely easy to cause the deformation of the adjustment gasket or the loosening of the adhesive, affecting the projection quality. Especially for measurement devices with high-precision requirements, it will seriously affect the measurement accuracy. Although some in the prior art have proposed to adjust the back focus and optical axis at the lens module, such as Patent CN109901349A, but either the lens needs to be disassembled back and forth during adjustment, or the structure at the lens becomes too complex, affecting the structure and volume of the whole machine, and is especially not suitable for application in micro-projection devices. Summary of the Invention

[0005] Based on the above situation, the main object of the present invention is to provide a projection optical machine, a projection device, and a 3D measurement device, which can take out and replace the metal gasket without disassembling the lens module and without additionally adding a special adjustment structure, so as to realize the adjustment of the flat field and back focus in the optical path, and can be applied to a micro-projector for high-precision measurement.

[0006] To achieve the above object, on the one hand, the technical solution adopted by the present invention is as follows:

[0007] The present invention relates to a projection optical machine, which includes an optical machine housing, a lens module, and a DMD module. The optical machine housing has a first side wall and a second side wall. The first side wall is provided with a DMD positioning surface, and a DMD mounting hole is provided on the DMD positioning surface. The lens module includes a lens barrel and optical lenses directly mounted in the lens barrel. The lens barrel includes a barrel body and a mounting flange connected to the barrel body. The DMD module includes a DMD component, and the DMD component includes a DMD device.

[0008] The second side wall is provided with a lens hole and mounting grooves. There are four mounting grooves arranged along the outer periphery of the lens hole, corresponding to the four corners of the projection screen of the projection optical machine respectively. The groove walls of each mounting groove are provided with discontinuous notches in the circumferential direction. The notches are located on the side of the mounting groove away from the lens hole to penetrate to the outer side surface of the optical machine housing and extend to the bottom of the mounting groove. A locking hole is provided at the bottom of the groove.

[0009] The DMD device is rigidly attached to the DMD positioning surface, and part of the DMD device extends into the DMD mounting hole, so that the DMD device is rigidly mounted on the DMD positioning surface.

[0010] The mounting flange includes a flange body and a pressing boss protruding from the mounting flange towards the light incident side. There are four pressing bosses distributed along the outer periphery of the barrel body, and each pressing boss is provided with a through hole penetrating in the thickness direction thereof. The four pressing bosses are respectively inserted into the four mounting grooves in one-to-one correspondence to form corresponding groups.

[0011] At each corresponding group, a metal gasket is provided between the bottom of the mounting groove and the pressing boss, and a locking member sequentially passes through the through hole, the central hole of the metal gasket and is in threaded cooperation with the locking hole. The metal gasket is an annular structure with an opening in the circumferential direction.

[0012] Among them, the back focal position of the lens module and the perpendicularity between the optical axis and the scaly surface of the DMD device can be adjusted by replacing the thickness of each metal gasket. During the replacement of the metal gaskets in each corresponding group, the metal gasket and the locking member can be separated, taken out and replaced from the notch by reducing the mating length between the locking member and the locking hole.

[0013] Preferably, mounting bosses are respectively provided on the outer surface of the second side wall at positions corresponding to the mounting grooves, and the mounting grooves are arranged on the mounting bosses. The notch penetrates the side wall of the mounting boss.

[0014] Preferably, a gap is left between the side wall of a corresponding group of mounting grooves and the pressing boss.

[0015] The second side wall is further provided with a first positioning post in a protruding manner; a first positioning hole groove is provided on the flange body, and the first positioning post is matched with the first positioning hole groove.

[0016] Preferably, the depth of the installation groove is less than the height of the pressing boss.

[0017] Preferably, the difference between the depth of the installation groove and the height of the pressing boss is 0.1 - 0.4 mm.

[0018] Preferably, at each corresponding group, the opening of the metal gasket is arranged in a dislocation manner with the notch.

[0019] Preferably, the projection optical machine further includes a sealing gasket, and the sealing gasket is arranged between the outer surface of the second side wall and the flange body and is located outside the lens hole.

[0020] Preferably, a DMD installation cavity is arranged on the outer surface of the first side wall, and the bottom surface of the DMD installation cavity forms the DMD positioning surface; the DMD installation hole is arranged on the bottom surface of the DMD installation cavity, and a second positioning post is further arranged on the bottom surface of the DMD installation cavity, and the second positioning post is located on the outer periphery of the DMD installation hole;

[0021] The DMD device is provided with a second positioning hole groove, and the second positioning hole groove is inserted and matched with the second positioning post.

[0022] Preferably, the DMD module further includes a DMD pressing assembly, and the DMD pressing assembly is connected to the outer surface of the first side wall and presses the DMD device.

[0023] Preferably, the projection optical machine further includes a smooth metal sheet, and the DMD device is rigidly attached to the DMD positioning surface through the smooth metal sheet.

[0024] The present invention also relates to a projection device, including the aforementioned projection optical machine.

[0025] The present invention also relates to a 3D measurement device, including the aforementioned projection optical machine.

[0026] The beneficial effects of the present invention:

[0027] In the projection optical machine provided by the present invention, the adjustment of the flat field and the back focus are both set between the lens module and the optical machine housing, and at this position, a pressing boss and a mounting groove inserted into each other are provided to press the metal gasket between the two. Since the mounting groove is provided with a notch and the metal gasket has an opening, during the adjustment of the flat field and the back focus positions, when it is necessary to change the thickness of one corresponding group of metal gaskets, only the locking member at this position needs to be loosened, and then the clamping tooling can be used to directly clamp the metal gasket through the notch, separate the metal gasket from the locking member through the opening on the metal gasket, and take it out. After that, the replaced metal gasket is snapped into the locking member through its opening, and by rotating the metal gasket, it can be judged whether its central hole is substantially coaxial with the locking member, and the metal gasket can be pressed into the mounting groove through the notch. Then, the pressing boss is reset, and the locking member locks the mounting flange and the optical machine housing to complete the replacement of the corresponding group of metal gaskets. In the adjustment process of the flat field and the back focus of the present invention, only the locking members need to be slightly loosened, and the locking member at the replacement position may need to be loosened to a greater extent, without completely disassembling the lens module. Therefore, the entire adjustment process is simple to operate, and only needs to be adjusted at the lens module, thereby improving the assembly efficiency of the projection optical machine; and the entire lens module does not need to be provided with additional adjustment structures, and can be set into a single-tube structure, so that the entire projection optical machine will not increase the volume due to the adjustment of the flat field and the back focus, and therefore can be applied to micro-projection devices; at the same time, after adjustment, each metal gasket can be locked by the locking member to improve the stability and reliability of the metal gasket, and can avoid direct contact with the high-temperature area at the DMD device. And even if part of the heat is conducted to the metal gasket, it can be quickly conducted out, reducing the possibility of deformation of the metal gasket; at the same time, through the insertion setting of the mounting groove and the pressing boss, the metal gasket can be better pressed in a limited space, further reducing the possibility of loosening or deformation of the metal gasket during later use. Therefore, the projection quality of the projection optical machine can be better guaranteed.

[0028] Other beneficial effects of the present invention will be described in the specific implementation manner through the introduction of specific technical features and technical solutions. Those skilled in the art should be able to understand the beneficial technical effects brought by the technical features and technical solutions through these introductions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following will describe the preferred embodiments according to the present invention with reference to the accompanying drawings. In the drawings:

[0030] Figure 1 is a schematic structural diagram of a preferred embodiment of the projection optical machine according to the present invention;

[0031] Figure 2 is an exploded view of a preferred embodiment of the projection optical machine according to the present invention;

[0032] Figure 3 Schematic structural diagram of a metal gasket according to a preferred embodiment of the projection optical machine of the present invention;

[0033] Figure 4 Partial structural schematic diagram of an optical machine housing of a projection optical machine according to a preferred embodiment of the present invention;

[0034] Figure 5 Partial structural schematic diagram of another preferred embodiment of the optical machine housing of the projection optical machine according to the present invention;

[0035] Figure 6 Schematic structural diagram of a lens module of a projection optical machine according to a preferred embodiment of the present invention;

[0036] Figure 7 Top view of a projection optical machine according to a preferred embodiment of the present invention;

[0037] Figure 8 Cross-sectional view of a preferred embodiment at the DMD module of the projection optical machine according to the present invention;

[0038] Figure 9 Exploded view of a preferred embodiment of the DMD pressing assembly of the projection optical machine according to the present invention.

[0039] In the figure:

[0040] 1. Optical machine housing; 2. First side wall; 3. Cylinder; 4. Mounting flange; 5. First part; 6. Second part; 7. DMD pressing assembly; 8. Locking part;

[0041] 11. Lens hole; 12. Locking hole; 13. Mounting groove; 14. Mounting boss; 15. Metal gasket; 16. Notch; 17. First positioning post; 18. Sealing gasket; 19. Second side wall;

[0042] 21. DMD mounting hole; 22. DMD mounting cavity; 23. Second positioning post; 24. DMD positioning surface

[0043] 41. First positioning hole groove; 42. Pressing boss; 43. Through hole; 44. Flange body; 51. Second positioning hole groove;

[0044] 71. Fixed pressing block; 72. Elastic pressing sheet; 73. Circuit board;

[0045] 151. Central hole; 152. Opening; 153. Notch. Specific embodiments

[0046] The present invention will be described based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and components are not described in detail.

[0047] In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only, and the drawings are not necessarily drawn to scale.

[0048] Unless the context clearly requires otherwise, the words such as "including", "comprising" and the like in the whole specification and claims should be interpreted as the meaning of including rather than exclusive or exhaustive; that is, the meaning of "including but not limited to".

[0049] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0050] In this application, the "outer side" and "inner side" are relative to the projection optical machine itself. The side close to the inside of the projection optical machine is the inner side, and the side far from the inside of the projection optical machine is the outer side.

[0051] As Figures 1 to 9 shown, the present invention relates to a projection optical machine, including an optical machine housing 1, a lens module, and a DMD module. The optical machine housing 1 has a first side wall 2 and a second side wall 19; a DMD positioning surface 24 is provided on the first side wall 2, and a DMD mounting hole 21 is provided on the DMD positioning surface 24. As Figure 4 shown, the DMD mounting hole 21 is located at the middle position of the first side wall 2 and penetrates the entire first side wall 2 to communicate the outside of the optical machine housing 1 and the inner cavity of the optical machine housing 1. The lens module includes a lens barrel and optical lenses directly installed in the lens barrel. The lens barrel in the present invention is a single barrel, not an inner barrel and an outer barrel with a double-layer structure, that is, the lens module in the present invention cannot perform focusing by itself. The lens barrel includes a barrel body 3 and a mounting flange 4 connected to the barrel body 3. The mounting flange 4 and the barrel body 3 can be an integral structure or assembled together by a connecting method. The mounting flange 4 surrounds the outer periphery of the barrel body 3.

[0052] See Figure 2 、 Figure 4 and Figure 8, the DMD module includes a DMD component, and the DMD component includes a DMD device. In terms of appearance, the DMD device includes a first part 5 and a second part 6 that are connected to each other (after the DMD device is mounted on the first side wall 2, it is divided with the DMD positioning surface 24 as the interface. The outer part is the first part 5, and the inner part is the second part 6). A part of the surface of the first part 5 facing the second part 6 extends beyond the edge of the second part 6. The first part 5 is electrically connected to the circuit board 73 through a DMD connector; the part of the first part 5 extending beyond the second part 6 is rigidly attached to the DMD positioning surface 24 ( Figure 8 as shown), the second part 6 extends into the DMD mounting hole 21 so that the DMD device is rigidly mounted to the DMD positioning surface 24. In the direction perpendicular to the DMD positioning surface 24, the first part 5 mounts and relatively fixes the second part 6 in the DMD mounting hole 21 from the outside to the inside, so that the first part 5 is directly and rigidly attached to the DMD positioning surface 24. The rigid attachment here is mainly with respect to components such as the adjustment gasket with adhesive that are prone to deformation by themselves and when heated, that is, the two can be directly in contact and attached (that is, there are no other components between the two), and a component made of a hard material, such as a metal sheet, can also be provided between the two (the first part 5 is indirectly and rigidly attached to the DMD positioning surface 24 through the hard metal sheet), but there are no soft structural components, such as adjustment gaskets with adhesive will not be provided. No matter which of the above methods, no soft structural components are provided between the first part 5 and the DMD positioning surface 24 in the present invention. Therefore, during later use, the projection quality of the DMD device will not be affected by the deformation of the soft structural components.

[0053] The second side wall 19 is provided with a lens hole 11 and mounting grooves 13. There are four mounting grooves 13 arranged along the outer periphery of the lens hole 11. If the second side wall 19 is rectangular, the four mounting grooves 13 are respectively located at the four corners of the second side wall 19, so that the four mounting grooves 13 can respectively correspond to the four corners of the projection screen of the projection optical machine. The groove walls of each mounting groove 13 are provided with discontinuous notches 16 in the circumferential direction. The notches 16 are located on the side of the mounting groove 13 away from the lens hole 11 (the notches 16 are located radially outside the lens hole 11) to penetrate to the outer side surface of the optical machine housing 1. For example, the optical machine housing 1 is Figure 4Arrange them in the shown style. All the notches 16 penetrate through the outer side of the second side wall 19. The notches 16 of the two upper mounting grooves 13 face upward, and the notches 16 of the two lower mounting grooves 13 face downward. Further, the notches 16 of the two upper mounting grooves 13 penetrate through the top surface of the optical housing 1, and the notches 16 of the two lower mounting grooves 13 penetrate through the bottom surface of the optical housing 1. Here, both the top surface and the bottom surface are the side surfaces of the optical housing 1 adjacent to the outer surface of the second side wall 19, and the top surface and the bottom surface are not coplanar with the outer surface of the first side wall 2. The notch 16 extends to the bottom of the mounting groove 13, and a locking hole 12 is provided on the bottom of the groove. As Figure 2 , Figure 4 shown, the lens hole 11 is basically arranged at the middle position of the second side wall 19 and penetrates through the entire second side wall 19 to connect the outside and the inner cavity of the optical housing 1. The mounting groove 13 and the lens hole 11 are on the same side of the second side wall 19 and can be formed by recessing inward from the outer surface of the second side wall 19. The recessing direction is the same as the penetration direction of the lens hole 11. Only the mounting groove 13 has a bottom and does not penetrate through the first side wall 19. And there are four mounting grooves 13 distributed along the outer circumference of the lens hole 11. Notches 16 are provided on the groove walls of each mounting groove 13 to facilitate the removal and replacement of the metal gasket 15 (details are described below). Locking holes 12 are distributed on the bottoms of the respective mounting grooves 13. The locking holes 12 can specifically be threaded holes to be in threaded cooperation with the locking member 8 (detailed below).

[0054] The mounting flange 4 includes a flange body 44 and a pressing boss 42 protruding on the mounting flange 4 toward the light incident side. A pressing boss 42 is provided at each of the four corners of the flange body 44. That is, the number of the pressing bosses 42 is four, and the four pressing bosses 42 are distributed along the outer circumference of the cylinder 3. A through hole 43 penetrating through its thickness direction is provided on the pressing boss 42, that is, the through hole 43 penetrates through the flange body 44. The four pressing bosses 42 are inserted into the four mounting grooves 13 one by one. Each group of corresponding mounting grooves 13 and pressing bosses 42 forms a corresponding group. Correspondingly, the number of the through holes 43 is the same as that of the locking holes 12 and they are in one-to-one correspondence. When the cylinder 3 is installed into the lens hole 11, each pressing boss 42 can be aligned with a corresponding mounting groove 13, so that the two can be inserted correspondingly. And when the two are in the inserted state, the through hole 43 is aligned with the corresponding locking hole 12, which facilitates the subsequent locking member 8 to pass through the through hole 43 and be connected with the locking hole 12. Finally, the four corners of the flange body 44 are respectively fixed to the four corners of the second side wall 19, achieving the purpose of fixing the lens module on the optical housing 1.

[0055] The projection optical machine further includes a plurality of metal gaskets 15 and locking members 8. The metal gasket 15 has an annular structure with an opening 152 in the circumferential direction. A central hole 151 is provided at the center of the metal gasket 15. The opening 152 penetrates through the radial outer side and the central hole 151 of the metal gasket 15, so that the central hole 151 communicates with the space on the radial outer side of the metal gasket 15. The size of the central hole 151 and the size of the through hole 43 may be the same or different. In any case, the sizes of both are larger than the outer diameter of the locking member 8, so that the locking member 8 can smoothly pass through the through hole 43, the central hole 151 and be connected to the locking hole 12. The outer shape of the metal gasket 15 is preferably the same as the cross-sectional shape of the installation groove 13. For example, if the cross-section of the installation groove 13 is circular, the metal gasket 15 is a circular metal gasket, and the outer diameter of the metal gasket may be equal to or slightly smaller than the inner diameter of the installation groove, so that the metal gasket 15 can be placed into the installation groove 13; or, if the cross-section of the installation groove 13 is square, at this time, the metal gasket 15 is a square metal gasket. Specifically, a metal gasket 15 is installed in each installation groove 13, and the pressing boss 42 corresponding to the installation groove 13 presses the metal gasket 15 therein. That is, in a corresponding group, a metal gasket 15 is provided between the bottom of the installation groove 13 and the pressing boss 42. Each corresponding group corresponds to a locking member 8, and the locking member 8 sequentially passes through the through hole 43, the central hole 151 and is in threaded cooperation with the locking hole 12.

[0056] Among them, the back focus of the lens module and the perpendicularity of the optical axis to the scale surface of the DMD device can be adjusted by replacing the thickness of each metal gasket 15 in each corresponding group, that is, adjusting the back focus and / or flat field. And when replacing the metal gaskets 15 in each corresponding group, by reducing the mating length of the locking member 8 and the locking hole 12, the metal gasket 15 and the locking member 8 can be separated, taken out and replaced from the notch 16.

[0057] During use, according to requirements, a metal gasket 15 is arranged in each installation groove 13, and then one end of the cylinder 3 facing the light incident side is installed into the lens hole 11, and the pressing boss 42 is inserted into the installation groove 13, and the pressing boss 42 presses the metal gasket 15 in the installation groove 13 (if there is a metal gasket 15 in the installation groove 13). At each corresponding group, the locking member 8 sequentially passes through the through hole 43 and the central hole 151, and finally is locked with the locking hole 12, so that the lens module is relatively fixed on the second side wall 19.

[0058] The number and thickness of the metal gaskets 15 in each installation groove 13 can be adjusted according to the actual situation. Specifically, the back focus can be adjusted by adjusting the metal gaskets 15 with the same thickness at each corresponding group, that is, adjusting the same thickness relative to the original metal gaskets 15 (including increasing the same thickness or decreasing the same thickness, specifically, directly replacing the metal gaskets 15 with the required thickness at each corresponding group) or adding or subtracting gaskets with the same thickness, so as to achieve the adjustment of the back focus; while the flat field is leveled by adjusting the metal gaskets 15 with different thicknesses at each corresponding group or at local corresponding groups. That is to say, relative to the original metal gaskets 15, the thickness adjusted (including increasing or decreasing) at each place is different. That is, when the thickness adjusted at some corresponding groups is larger and the thickness adjusted at some corresponding groups is smaller, the flat field can be leveled. Specifically, which corresponding group has a larger adjusted thickness and which corresponding group has a smaller adjusted thickness can be determined according to the test target. Specifically, during the process of adjusting the flat field and the back focus during assembly, a small piece of white paper can be directly used as the imaging surface, and the imaging is carried out at the four corner positions of the projection screen respectively (each corner position corresponds to a corresponding group). By adjusting the position of the white paper to make the image on it clear, the difference between the position where the white paper is located (i.e., the actual focal point position) and the position of the ideal projection screen is determined. If the differences at each corner position are equal, the metal gaskets 15 of each corresponding group are adjusted by the same thickness. If the differences at each corner position are different, the thickness of the metal gaskets 15 of the corresponding group is adjusted according to the differences at each corner position. It can be seen that in the present invention, only the installation position between the lens module and the optical machine housing needs to be adjusted, that is, the relative position between the lens module and the second side wall 19 is adjusted, so that the positions of the flat field and the back focus can be adjusted, thereby ensuring the projection quality of the projection optical machine.

[0059] The thickness of the metal gasket 15 can have various specifications. When setting the metal gasket 15 into the installation groove 13, the gasket with the corresponding specification can be selected according to the actual demand, so as to realize the adjustment of the positions of the flat field and the back focus and ensure the projection quality of the projection optical machine.

[0060] The locking member 8 is a locking screw. When adjusting the metal gaskets 15 at each corresponding group, specifically, when the back focus and the flat field need to be adjusted, each locking member 8 can be rotated reversely (for the convenience of description, the forward rotation of the locking member 8 is defined as locking, and the reverse rotation of the locking member 8 is defined as loosening), so that the matching length between the top part of the locking member 8 and the locking hole 12 is reduced. When the width of the notch 16 in the circumferential direction of the installation groove 13 can be smaller than that of the metal gasket 15 (see Figure 4), the corresponding group of pressing bosses 42 need to be able to withdraw from the mounting groove 13 (the degree of loosening of the locking piece at the corresponding group of the metal gasket 15 needs to be adjusted is relatively large), at this time, the metal gasket 15 in the mounting groove 13 can be pushed outward through the notch 16 by a clamping tool (such as tweezers), so that the metal gasket 15 is located outside the mounting groove 13, and then the metal gasket 15 is removed from the locking piece 8 along the opening 152 on the metal gasket 15, so that the purpose of removing the metal gasket 15 can be achieved without completely disassembling the lens module. When it is necessary to replace the new metal gasket 15, after taking out the metal gasket 15 according to the above process, the new metal gasket 15 is inserted into the part of the locking piece 8 between the clamping boss 42 and the mounting groove 13 through its opening 152 (the new metal gasket 15 can be pushed through the notch 16 and pressed into the mounting groove 13 by tools such as tweezers, and by rotating the metal gasket 15, it can be determined whether its center hole 151 is basically coaxial with the locking piece 8), and then the locking piece 8 is rotated in the forward direction to clamp the new metal gasket 15.

[0061] According to the above process, the metal gasket 15 at each corresponding group can be adjusted, so as to achieve the purpose of adjusting the back focus and / or flat field without disassembling the lens module.

[0062] In the above process, the width of the opening 152 of the metal gasket 15 is preferably slightly larger than the diameter of the screw of the locking member 8 , so that the metal gasket 15 can be easily inserted into the locking member 8 , or separated from the locking member 8 .

[0063] See also Figure 4 The width of the notch 16 in the circumferential direction of the mounting groove 13 may be smaller than the diameter of the metal gasket 15 (in an embodiment where the metal gasket 15 is circular), thereby ensuring that the metal gasket 15 will not separate from the mounting groove 13 from the notch 16 .

[0064] Of course, if Figure 5 As shown, the width of the notch 16 can be equal to or slightly larger than the diameter of the metal gasket 15. At this time, when the metal gasket 15 needs to be removed or replaced, after loosening the locking piece 8 in the reverse direction (without the need to make the clamping boss 42 withdraw from the mounting groove 13), the metal gasket 15 can be rotated so that the direction of the opening 152 of the metal gasket 15 is opposite to the direction of the notch 16, so that the metal gasket 15 can be directly taken out of the mounting groove 13 through the notch 16 (without the need to push the metal gasket 15 outward). Similarly, the metal gasket 15 can also be directly set in the mounting groove 13 through the notch 16.

[0065] Further, a notch 153 is also provided on the metal gasket 15. The notch 153 is located on the radial outer wall of the metal gasket 15. In other words, a notch 153 is formed by the inward depression of the radial outer wall of the metal gasket 15. The notch 153 can be, for example, Figure 3 semicircular as shown, or can be of other shapes, such as rectangular, triangular, etc. The size of the notch 153 is much smaller than that of the opening 152. The notch 153 is not communicated with the central hole 151. The notch 153 is preferably arranged opposite to the opening 152 (that is, the two are basically on the same radial line of the metal sheet but face in opposite directions). When it is necessary to take out or replace the metal gasket 15, the notch 153 on the metal gasket 15 can be toggled through the notch 16, so that the metal gasket 15 rotates around the locking member 8, making the notch 153 exactly in the middle of the notch 16. At this time, it can be ensured that the direction of the opening 152 on the metal gasket 15 is exactly opposite to the direction of the notch 16 (as shown in Figure 5 ), which is convenient for taking out the metal gasket 15. Therefore, in the present invention, the position of the opening 152 on the metal gasket 15 can be determined by the position of the notch 153.

[0066] Of course, the number of notches 153 on a single metal gasket 15 can be multiple, such as two, three or more, so as to facilitate toggling the metal gasket 15 through these notches 153.

[0067] In addition, after the projection optical machine is assembled, it can be checked through the notch 16 whether the metal gaskets 15 in the respective mounting grooves 13 are pressed tightly (see Figure 7 ). If it is found that the metal gaskets 15 in the mounting grooves 13 are not pressed tightly (the notch 16 preferably faces the radial outside of the lens hole 11), the metal gaskets 15 can be added or thicker metal gaskets 15 can be replaced to ensure that the metal gaskets 15 in each mounting groove 13 are pressed tightly, thereby avoiding the possibility of deformation of the metal gasket 15 in the later stage and ensuring the stability of the position of the lens module relative to the optical machine housing 1, and ensuring the projection quality of the projection optical machine.

[0068] It can be seen that in the present invention, during the process of adjusting the metal gaskets 15 of each corresponding group, there is no need to disassemble the lens module at all. Only by simply loosening the corresponding locking member 8 can the metal gasket 15 be easily taken out or replaced, and the back focus and / or flat field can be adjusted. Especially during the frequent adjustment process, the time for adjusting the metal gasket 15 each time can be greatly shortened, thereby improving the assembly efficiency of the projection optical machine. Moreover, even if the flat field and back focus change due to the loosening of the locking member 8 in the later stage, simply tightening the locking member 8 again can make the flat field and back focus return to the original state, and there is basically no need to readjust the flat field and back focus according to the above-mentioned process of adjusting the metal gasket 15, which simplifies the after-sales process. Furthermore, the present invention does not add an additional adjustment structure specifically for adjusting the back focus and flat field, and the lens barrel is a single barrel, so that the volume of the projection optical machine will not increase. Therefore, especially for projection devices with high volume requirements, such as micro-projection devices, the projection optical machine of the present invention will not increase the volume of the projection optical machine while realizing the adjustment of the back focus and / or flat field, so it is particularly suitable for application in micro-projection devices.

[0069] Moreover, by setting the metal gasket 15, the present invention simplifies the installation method of the lens module and improves the assembly efficiency of the projection optical machine. Moreover, the metal gasket 15 is a rigid structural member (such as a stainless steel metal gasket), which has a large stiffness and a small possibility of deformation. And the metal gasket 15 is located at the position of the second side wall 19, so that there is a certain distance between the metal gasket 15 and the DMD module. Even in the later use, although there is a lot of heat generated by the light at the DMD module, it will basically not directly affect the metal gasket 15. Moreover, even if part of the heat is conducted to the metal gasket 15, due to its metal material, the metal gasket 15 can quickly conduct the heat outwards, thereby reducing the possibility of deformation of the metal gasket 15. At the same time, through the insertion setting of the installation groove 13 and the pressing boss 42, the metal gasket 15 can be better pressed in a limited space, further reducing the possibility of loosening or deformation of the metal gasket 15 during later use. Therefore, the projection quality of the projection optical machine can be better guaranteed.

[0070] See Figure 4 , for the installation groove 13, preferably, installation bosses 14 are respectively provided on the outer surface of the second side wall 19 at the positions corresponding to the installation groove 13, the installation groove 13 is arranged on the installation boss 14, and the notch 16 penetrates through the side wall of the installation boss 14.

[0071] The second side wall 19 can locally protrude outward based on its outer surface to form an annular mounting boss 14. The side of the mounting boss 14 facing the light-emitting side is recessed inward to form a mounting groove 13, and the bottom of the mounting groove 13 is recessed inward to form a locking hole 12. When the metal gasket 15 is set into the mounting groove 13, during the initial assembly of the projection optical machine, the mounting boss 14 can limit the metal gasket 15 from the peripheral side. Therefore, it is basically unnecessary to hold the metal gasket 15 by hand, and the locking member 8 can pass through the through hole 43 and the central hole 151. Moreover, through the setting of the mounting boss 14, the thickness of the second side wall at this position can be increased, so that the locking hole can be set deeper to increase the locking depth of the locking member, which is beneficial to the reliability of the installation of the lens module and the optical machine housing.

[0072] In another embodiment, the second side wall 19 can be directly recessed inward to form a mounting groove 13, and then a locking hole 12 is provided on the bottom of the mounting groove 13. Similarly, the groove wall of the mounting groove 13 can limit the metal gasket 15 from the peripheral side, facilitating the locking member 8 to pass through the through hole 43 and the central hole 151.

[0073] See Figure 4 , in addition, the mounting boss 14 is integrally C-shaped, a notch 16 is formed between the two circumferential ends of the mounting boss 14, the radian of the mounting boss 14 is 200° - 350°, and the two circumferential ends of the mounting boss 14 are arc-shaped, which is convenient for replacing or taking out the metal gasket 15.

[0074] Furthermore, the depth of the mounting groove 13 is less than or equal to the height of the pressing boss 42 (the dimension in the axial direction of the cylinder 3, which is also the dimension along the optical axis direction). Even when no metal gasket 15 is provided in an individual mounting groove 13, the top end of the pressing boss 42 can contact the bottom of the mounting groove 13. Therefore, no matter what specification of metal gasket 15 is provided in the mounting groove 13, the top end of the pressing boss 42 can contact the metal gasket 15. Thus, the position of the pressing boss 42 relative to the second side wall 19 can be adjusted through the metal gasket 15, so as to achieve the purpose of adjusting the flat field and the back focus positions through the metal gasket 15.

[0075] In other embodiments, the depth of the installation groove 13 can be slightly greater than the height of the pressing boss 42. At this time, if no metal gasket 15 is provided in the installation groove 13, there will be a gap between the top end of the pressing boss 42 and the bottom of the installation groove 13, and the top of the installation boss 14 will abut against the side of the flange body 44 facing the light incident side. Therefore, the position of the lens module relative to the optical housing 1 can also be fixed. Of course, in this case, if a metal gasket 15 is provided in the installation groove 13 and the thickness of the metal gasket 15 is greater than or equal to the difference between the depth of the installation groove 13 and the height of the pressing boss 42, the pressing boss 42 can be squeezed against the bottom of the installation groove 13 through the metal gasket 15 at this time, and the purpose of adjusting the flat field and the back focus position can also be achieved by setting a metal gasket 15 with a certain specification.

[0076] Preferably, the difference between the depth of the installation groove 13 and the height of the pressing boss 42 is 0.1 - 0.4 mm (in this embodiment, the height of the pressing boss 42 is greater than the depth of the installation groove 13), for example, 0.1 mm, 0.2 mm, 0.3 mm or 0.4 mm, etc. This thickness needs to be adjusted according to the actual usage requirements of the optical machine. The height of the pressing boss 42 is slightly larger than the depth of the installation groove 13, and it is not necessary to make the depth of the installation groove 13 equal to the height of the pressing boss 42, which reduces the processing difficulty of the installation groove 13 and the pressing boss 42.

[0077] Preferably, at each corresponding group, the opening 152 of the metal gasket 15 is arranged offset from the notch 16, enabling the metal gasket 15 to be toggled through the notch 16.

[0078] In an embodiment where the width of the notch 16 is greater than or equal to the diameter of the metal gasket 15, preferably, the direction of the opening 152 of the metal gasket 15 and the direction of the notch 16 are not 180° ( Figure 5 The state shown is the state where the direction of the opening 152 of the metal gasket 15 and the direction of the notch 16 are 180°), so that the metal gasket 15 will not come out from the notch 16.

[0079] Preferably, a gap is left between the side walls of a corresponding set of the installation groove 13 and the pressing boss 42. When the installation groove 13 and the pressing boss 42 cooperate with each other, the pressing boss 42 is at least partially inserted into the installation groove 13, and there is a clearance fit between the outer wall of the pressing boss 42 and the groove wall of the installation groove 13, which facilitates the insertion of these two components and will not cause difficulties in inserting the pressing boss 42 into the installation groove 13 due to differences in the metal gaskets 15 at each corresponding group.

[0080] The second side wall 19 is also provided with a first positioning post 17 protruding therefrom. Specifically, the first positioning post 17 can be formed by protruding from the outer surface of the second side wall 19 towards the light-emitting side, and the length of the first positioning post 17 can be greater than the height of the pressing boss 42. A first positioning hole groove 41 is provided on the flange body 44, and the first positioning post 17 cooperates with the first positioning hole groove 41. When the flange body 44 and the second side wall 19 are assembled with each other, the positioning of the two is achieved by the cooperation of the first positioning post 17 and the first positioning hole groove 41 first (at this time, the pressing boss 42 has not been inserted into the installation groove 13), improving the installation accuracy of the lens module and the optical machine housing 1. Especially in the embodiment where there is a gap between the pressing boss 43 and the side wall of the installation groove 13, and through this cooperation structure, the pressing boss 42 can be accurately inserted into the corresponding installation groove 13. The first positioning hole groove 41 can be a hole or can be Figure 6 the groove shown; of course, the first positioning hole groove 41 can be located on the second side wall 19, and the first positioning post 17 can be located on the flange body 44.

[0081] Of course, the number of the first positioning posts 17 is at least two, and the number of the first positioning hole grooves 41 is equal to the number of the first positioning posts 17 to ensure that multi-point positioning can be achieved between the flange body 44 and the second side wall 19 and ensure the accuracy of the positioning between the two.

[0082] Preferably, the outer surface of the second side wall 19 is a rectangular surface. Specifically, in the present invention, it is not limited to a standard rectangle and can be a quasi-rectangular structure. Installation grooves 13 are respectively provided at the corners of the rectangular surface. An installation groove 13 is provided at each of the four corners of the second side wall 19. The installation flange 4 is also rectangular. Pressing bosses 42 and through holes 43 are respectively provided at the four corners of the installation flange 4, so that the four corners of the installation flange 4 and the four corners of the second side wall 19 can be respectively locked by locking members 8. In order to facilitate flattening the field and adjusting the back focus, a rectangular test piece is usually selected during the assembly adjustment. By adopting the method of setting the adjustment positions at the four corners of such a rectangular surface, the four corresponding groups on the projection optical machine can be corresponded to the four corners of the test piece, thereby facilitating the adjustment after testing; and this rectangular surface structure can also facilitate processing and assembly, thus ensuring that the lens module can be stably fixed on the optical machine housing 1.

[0083] In other embodiments, the second side wall 19 can be circular, and the corresponding installation flange 4 is also circular. Four installation grooves 13 are provided at equal intervals along the circumference. Similarly, four through holes 43 are also provided along the circumference of the installation flange 4.

[0084] Preferably, the projection optical machine further includes a gasket 18, which is disposed between the outer surface of the second sidewall 19 and the flange body 44 and is located outside the lens hole 11. The second sidewall 19 and the mounting flange 4 will squeeze the gasket 18, so that there is basically no gap between the second sidewall 19 and the mounting flange 4, preventing external dust and other impurities from entering the lens hole 11 and ensuring the projection quality of the projection optical machine.

[0085] For the installation of the DMD module, preferably, a DMD installation cavity 22 is provided on the outer surface of the first sidewall 2, and the bottom surface of the DMD installation cavity 22 forms a DMD positioning surface 24; a DMD installation hole 21 is provided on the bottom surface of the DMD installation cavity 22, and a second positioning post 23 is further provided on the bottom surface of the DMD installation cavity 22, and the second positioning post 23 is located outside the DMD installation hole 21. The first part 5 is provided with a second positioning hole groove 51, and the second positioning hole groove 51 is inserted and matched with the second positioning post 23.

[0086] The first part 5 is disposed in the DMD installation cavity 22 and fits against the DMD positioning surface 24, and at the same time, the second part 6 is restricted in the DMD installation hole 21. The first part 5 is inserted and matched with the second positioning post 23 through the second positioning hole groove 51, so that the first part 5 has a unique position in the DMD installation cavity 22, thereby enabling the second part 6 to have a unique position in the DMD installation hole 21, thus determining the installation position of the DMD device.

[0087] In some embodiments, a smooth metal sheet may be provided between the first part 5 and the DMD positioning surface 24. In this embodiment, the first part 5 and the DMD positioning surface 24 are indirectly and rigidly fitted through the smooth metal sheet. By providing the smooth metal sheet, it has fast heat conduction and can conduct the heat at the DMD device out as soon as possible, ensuring the probability of the entire projection optical machine being affected by heat; and since the smooth metal sheet is a hard material, even if it is heated, the heat can be quickly conducted out, and when the DMD device or the DMD module expands and contracts during operation, it can slide freely on the smooth metal sheet without being hindered, so that the influence of temperature change on the DMD is controllable. After using software calculation for reverse compensation, the accuracy influence caused by thermal expansion and contraction of the projection optical machine can be reduced, especially when the projection optical machine is applied to a measuring device, this effect is particularly obvious. The smooth metal sheet may specifically be a stainless steel sheet or other components.

[0088] Further, the DMD module further includes a DMD pressing assembly 7, and the DMD pressing assembly 7 is connected to the outer surface of the first sidewall 18 and presses the first part 5.

[0089] See Figure 8 and Figure 9, in one embodiment, the DMD pressing assembly includes a circuit board 73, an elastic pressing piece 72, and a fixed pressing block 71 arranged in sequence from the inside to the outside. The circuit board 73 is electrically connected to the side of the first part 5 away from the second part 6. The elastic pressing piece 72 is located between the fixed pressing block 71 and the circuit board 73. The fixed pressing block 71 is fixed to the first side wall 2 by screws and squeezes the elastic pressing piece 72 from the outside to the inside, causing the elastic pressing piece 72 to deform in the inner and outer directions. The deformation of the elastic pressing piece 72 continuously squeezes the outside of the circuit board 73 inward, and indirectly squeezes the first part 5 inward through the circuit board 73, so that the first part 5 is closely attached to the DMD positioning surface 24, ensuring that even if the second part 6 generates high temperature, it will not change the state where the first part 5 is closely attached to the DMD positioning surface 24, and ensuring the projection quality of the projection optical machine.

[0090] The present invention also relates to a projection device, including the aforementioned projection optical machine.

[0091] The present invention also relates to a 3D measurement device, including the aforementioned projection optical machine.

[0092] In the projection optical machines of projection devices and 3D measurement devices, the adjustment shims for the back glue at the DMD module are cancelled, and the adjustment of flat field and back focus are both set between the lens module and the optical machine housing 1. And at this position, the press-fit bosses 42 and the mounting grooves 13 inserted into each other are provided to press the metal shim 15 therebetween. Since the mounting groove 13 is provided with a notch 16 and the metal shim 15 has an opening 152, during the adjustment of the flat field and back focus positions, when it is necessary to replace the thickness of one corresponding group of metal shims 15, only the locking member 8 at this position needs to be loosened, and then the clamping tooling can directly clamp the metal shim 15 through the notch 16, and separate the metal shim 15 from the locking member 8 through the opening 152 on the metal shim 15 and take it out. After that, the replaced metal shim 15 is snapped into the locking member 8 through its opening 152, and by rotating the metal shim 15, it can be judged whether its central hole 151 is substantially coaxial with the locking member 8, and the metal shim 15 can be pressed into the mounting groove 13 through the notch 16. Then the press-fit boss 42 is reset, and the locking member 8 locks the mounting flange 4 and the optical machine housing 1 to complete the replacement of the corresponding group of metal shims 15. In the whole adjustment process of the flat field and back focus of the present invention, only the locking members 8 need to be slightly loosened, and the locking member 8 at the replacement position may need to be loosened to a greater extent, without the need to completely disassemble the lens module. Therefore, the whole adjustment process is simple to operate, and only the adjustment needs to be carried out at the lens module, thereby improving the assembly efficiency of the projection optical machine; and the whole lens module does not need to be provided with additional adjustment structures and can be set as a single-tube structure, so that the whole projection optical machine will not increase the volume basically due to the adjustment of the flat field and back focus, and thus can be applied to micro-projection devices; at the same time, after adjustment, each metal shim 15 can be locked by the locking member 8 to improve the stability and reliability of the metal shim 15, and can avoid direct contact with the high-heat area of the DMD device. And even if part of the heat is conducted to the metal shim 15, it can be quickly conducted out, reducing the possibility of deformation of the metal shim 15; at the same time, through the inserted setting of the mounting groove 13 and the press-fit boss 42, the metal shim 15 can be better pressed in a limited space, further reducing the possibility of loosening or deformation of the metal shim 15 during later use. Therefore, the projection quality of the projection device can be better guaranteed.

[0093] It should be noted that although the inner diameter and radial direction are mentioned in the text, it does not limit that the corresponding structure must be a circular or cylindrical structure, and it only refers to the direction from the center to the edge.

[0094] Those skilled in the art can understand that on the premise of no conflict, the above preferred solutions can be freely combined and superimposed.

[0095] It should be understood that the above-described embodiments are merely exemplary and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that those skilled in the art can make to the above details will all be included within the scope of the claims of the present invention.

Claims

1. A projection optical machine, comprising an optical machine housing, a lens module, and a DMD module. The optical machine housing has a first side wall and a second side wall. The first side wall is provided with a DMD positioning surface, and a DMD mounting hole is provided on the DMD positioning surface. The lens module includes a lens barrel and optical lenses directly mounted in the lens barrel. The lens barrel includes a barrel body and a mounting flange connected to the barrel body. The DMD module includes a DMD component, and the DMD component includes a DMD device. It is characterized in that a lens hole and mounting grooves are provided on the second side wall. There are four mounting grooves arranged along the outer periphery of the lens hole, corresponding to the four corners of the projection screen of the projection optical machine respectively. The groove walls of each mounting groove are provided with discontinuous notches in the circumferential direction. The notches are located on the side of the mounting groove away from the lens hole to penetrate to the outer side surface of the optical machine housing and extend to the bottom of the mounting groove. A locking hole is provided at the bottom of the groove. the DMD device is rigidly attached to the DMD positioning surface, and part of the DMD device extends into the DMD mounting hole so that the DMD device is rigidly mounted on the DMD positioning surface. the mounting flange includes a flange body and a pressing boss protruding from the mounting flange toward the light incident side. There are four pressing bosses distributed along the outer periphery of the barrel body. Each pressing boss is provided with a through hole penetrating in the thickness direction thereof. The four pressing bosses are inserted into the four mounting grooves one by one to form corresponding groups respectively. at each corresponding group, a metal gasket is provided between the bottom of the mounting groove and the pressing boss, and a locking member sequentially passes through the through hole, the central hole of the metal gasket and is in threaded cooperation with the locking hole. The metal gasket is an annular structure with an opening in the circumferential direction. wherein, the back focal position of the lens module and the perpendicularity of the optical axis to the scaly surface of the DMD device can be adjusted by replacing the thickness of each metal gasket. In the replacement of the metal gaskets of each corresponding group, the metal gasket and the locking member can be separated, taken out and replaced from the notch by reducing the matching length between the locking member and the locking hole.

2. The projection optical machine according to claim 1, wherein mounting bosses are respectively provided on the outer surface of the second side wall at positions corresponding to the mounting grooves. The mounting grooves are arranged on the mounting bosses. The notch penetrates the side wall of the mounting boss.

3. The projection optical machine according to claim 1, characterized in that, a gap is left between the side wall of a corresponding group of mounting grooves and the pressing boss. the second side wall further protrudes with a first positioning post. A first positioning hole groove is provided on the flange body, and the first positioning post is matched with the first positioning hole groove.

4. The projection optical machine according to claim 1, wherein the depth of the mounting groove is less than the height of the pressing boss.

5. The projection optical machine according to claim 4, wherein the difference between the depth of the mounting groove and the height of the pressing boss is 0.1 - 0.4 mm.

6. The projection optical machine according to any one of claims 1-5, characterized in that, at each corresponding group, the opening of the metal gasket is arranged in a staggered manner with the notch.

7. The projection optical machine according to any one of claims 1-6, characterized in that, a sealing gasket is further included. The sealing gasket is arranged between the outer surface of the second side wall and the flange body and is located on the outer periphery of the lens hole.

8. The projection optical machine according to claim 1, characterized in that, The outer surface of the first side wall is provided with a DMD mounting cavity, and the bottom surface of the DMD mounting cavity forms the DMD positioning surface; the DMD mounting holes are arranged on the bottom surface of the DMD mounting cavity, and a second positioning post is further arranged on the bottom surface of the DMD mounting cavity, and the second positioning post is located on the outer periphery of the DMD mounting holes; The DMD device is provided with a second positioning hole groove, and the second positioning hole groove is in insertion fit with the second positioning post.

9. The projection optical machine according to claim 8, wherein The DMD module further includes a DMD pressing assembly, and the DMD pressing assembly is connected to the outer surface of the first side wall and presses the DMD device.

10. The projection optical machine according to any one of claims 1-9, characterized in that, It further includes a smooth metal sheet, and the DMD device is rigidly attached to the DMD positioning surface through the smooth metal sheet.

11. A projection device, characterized in that, It includes the projection optical machine according to any one of claims 1 to 10.

12. A 3D measurement device, characterized in that, It includes the projection optical machine according to any one of claims 1 to 10.

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