A projection optical machine and a projector

Abstract

The present invention provides a projection optical machine and a projector, which include a housing, a light source module, a lens module, a DMD module, and an optical adjustment module. The optical adjustment module includes a spherical lens assembly, and the spherical lens assembly includes three spherical edge-cut lenses, and each spherical edge-cut lens is a part of a spherical glass lens; the direction parallel to the optical axis of the lens module is the first direction, and the direction perpendicular to the optical axis of the lens module is the second direction. The space occupied by the spherical lens assembly in the second direction causes there to be a spacing dimension L1 in the second direction between the compound eye lens and the optical axis of the lens module. The lens module includes an ultra-short focal length lens, and the minimum distance from the side wall of the lens barrel of the ultra-short focal length lens to the optical axis is L2, and L1 > L2. The present invention uses multiple spherical edge-cut lenses to adjust the optical path, effectively reducing the development cost, and does not require a reflector to cooperate so that the light can be effectively propagated after large-angle refraction, and can meet the installation requirements of the ultra-short focal length lens.

Description

Technical Field

[0001] The present invention relates to the field of projection devices, and particularly to a projection optical engine and a projector. Background Art

[0002] In existing projection optical engines, multiple integral circular spherical glass lenses are usually used to adjust the optical path. In the optical path, a reflecting mirror is used in cooperation with the aforementioned lenses to make light enter the lens along a predetermined route to complete the projection work. The setting of the reflecting mirror in the optical path will cause the complex structure of the optical engine. In addition, all-plastic lenses or a combination of plastic lenses and integral circular spherical glass lenses are usually used. However, plastic lenses need to be molded, with a relatively high initial investment and inferior heat and light resistance performance compared to glass lenses. Summary of the Invention

[0003] Based on the above situation, the main object of the present invention is to provide a projection optical engine and a projector with reduced production costs, simple and compact structures.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a projection optical engine, including a housing and a light source module, a lens module, a DMD module, and an optical adjustment module installed in the housing. The optical adjustment module includes a compound eye lens, a spherical lens assembly, and a prism assembly.

[0006] The DMD module, the prism assembly, and the lens module are arranged in sequence along a first direction, and the compound eye lens, the spherical lens assembly, and the prism assembly are arranged in sequence along a second direction. Among them, the direction parallel to the optical axis of the lens module is the first direction, and the direction perpendicular to the optical axis of the lens module is the second direction.

[0007] The spherical lens assembly includes a first spherical cut-edge lens, a second spherical cut-edge lens, and a third spherical cut-edge lens arranged in sequence between the compound eye lens and the prism assembly. Each spherical cut-edge lens is a part of a spherical glass lens. Each spherical cut-edge lens includes an outgoing light surface, an incoming light surface, and a side surface. The side surface includes an upper cut surface, a lower cut surface, a side edge surface, and a side cut surface opposite to the side edge surface. The side edge surface is a part of the edge surface of the spherical glass lens. Each spherical cut-edge lens includes a first end and a second end. Among them, the end where the side edge surface is located is the first end, and the end where the side cut surface is located is the second end.

[0008] In the first direction, the first ends of the first spherical cut-edge lens and the second spherical cut-edge lens are closer to the DMD module than the second ends, and the second end of the third spherical cut-edge lens is closer to the DMD module than the first end.

[0009] In the second direction, the first end of the first spherical edge-cut lens is closer to the compound eye lens than the second end. The distance between the second end of the second spherical edge-cut lens and the second end of the first spherical edge-cut lens is less than the distance between the first end of the second spherical edge-cut lens and the first end of the first spherical edge-cut lens. The distance between the second end of the third spherical edge-cut lens and the first end of the second spherical edge-cut lens is less than the distance between the first end of the third spherical edge-cut lens and the second end of the second spherical edge-cut lens;

[0010] The space occupied by the first spherical edge-cut lens, the second spherical edge-cut lens, and the third spherical edge-cut lens in the second direction results in an interval dimension L1 in the second direction between the compound eye lens and the optical axis of the lens module.

[0011] The lens module includes an ultra-short focal length lens. The lens barrel of the ultra-short focal length lens includes a lens barrel side wall close to the light source module. The minimum distance dimension from the lens barrel side wall to the optical axis of the lens module is L2, and L1 > L2.

[0012] Optionally, the lens barrel of the ultra-short focal length lens is axially divided into multiple segments with different outer diameters. Among them, the first segment adjacent to the housing has the smallest outer diameter. The first segment includes a first side wall close to the light source module. The interval dimension L2 is the distance between the first side wall and the optical axis of the lens module.

[0013] Optionally, the lens barrel of the ultra-short focal length lens further includes a second segment in the axial direction. The second segment includes a second side wall close to the light source module. In the second direction, the minimum distance dimension from the second side wall to the optical axis of the lens module is L3, and L3 ≥ L1. The second segment includes a rear wall close to the DMD module, and the distance between the rear wall and the DMD module is X. The light source module includes a front wall far from the DMD module, and the distance between the front wall and the DMD module is Y, and X > Y.

[0014] Optionally, the prism assembly includes a first prism and a second prism with a triangular cross-section. The first prism includes a bottom surface and a first side surface, and an obtuse angle is formed between the bottom surface and the first side surface. The bottom surface faces the DMD module, and the first side surface faces the light-emitting surface of the third spherical edge-cut prism.

[0015] Optionally, the first spherical edge-cut lens, the second spherical edge-cut lens, and the third spherical edge-cut lens are all formed by dividing a spherical glass lens, and each is less than one-half of the corresponding spherical glass lens, so that one spherical glass lens can be divided into two of the first spherical edge-cut lenses or two of the second spherical edge-cut lenses or two of the third spherical edge-cut lenses.

[0016] Optionally, at least one of the light-emitting surface or the light-incident surface of each spherical edge-cut lens is a convex surface. Each spherical edge-cut lens is provided with an edge-cut lens mounting structure, and the edge-cut lens mounting structure includes a positioning mounting frame. Each spherical edge-cut lens is positioned and mounted in a corresponding positioning mounting frame. A first arc-shaped positioning surface that cooperates with the periphery of the convex surface, an upper positioning surface that cooperates with the upper cut surface, a lower positioning surface that cooperates with the lower cut surface, and a second arc-shaped positioning surface that cooperates with the side edge surface are provided on the inner wall of the positioning mounting frame. There is a gap between the frame body of the positioning mounting frame opposite to the side cut surface and the side cut surface, and an elastic member is arranged in the gap. The elastic member presses the spherical edge-cut lens against the second arc-shaped positioning surface.

[0017] Optionally, a positioning protrusion is provided on the outer side of the positioning mounting frame, and a protrusion structure is protrudingly provided on the inner side wall of the housing of the optical engine. A positioning groove is provided on the protrusion structure, and the positioning protrusion is embedded in the positioning groove to mount the edge-cut lens mounting structure in the housing.

[0018] Optionally, the light source module includes a collimating lens assembly, and both the collimating lens assembly and the fly-eye lens are made of plastic lenses.

[0019] In a second aspect, the present invention further provides a projector, including the projection optical engine as described above.

[0020] In the projection optical engine and the projector provided by the present invention, in the optical adjustment module in the projection optical engine, multiple spherical edge-cut lenses are used to adjust the optical path. The spherical edge-cut lens is a part of a circular spherical glass lens, which effectively reduces the development cost. When a circular spherical glass lens can be made into two spherical edge-cut lenses, the production cost can be further saved, especially suitable for the development and production of small-batch optical engines. Moreover, the optical path formed by the cooperation of multiple spherical edge-cut lenses in the present invention can enable the light transmitted from the fly-eye lens to directly enter the prism assembly after passing through the multiple spherical edge-cut lenses, without the need for a reflector to cooperate to make the light refract at a large angle to achieve effective propagation. At the same time, after the multiple spherical edge-cut lenses are arranged according to the requirements of the optical path propagation, there is enough space between the optical axes of the fly-eye lens and the lens module to meet the installation needs of an ultra-short focal length lens.

[0021] 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. Description of the Drawings

[0022] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features, and advantages of the present invention will become clearer. In the drawings:

[0023] Figure 1 Schematic diagram of the front view structure of a preferred embodiment of the projection optical machine provided by the present invention;

[0024] Figure 2 Schematic diagram of the rear three-dimensional structure of a preferred embodiment of the projection optical machine provided by the present invention;

[0025] Figure 3 Schematic diagram of the front view structure after removing the optical machine housing and the trimming lens mounting structure in a preferred embodiment of the projection optical machine provided by the present invention;

[0026] Figure 4 is Figure 3 Local structure enlarged view in the area where the spherical trimming lens is located;

[0027] Figure 5 Schematic diagram of the rear three-dimensional structure after removing the optical machine housing and the trimming lens mounting structure in a preferred embodiment of the projection optical machine provided by the present invention;

[0028] Figure 6 is Figure 5 Local structure enlarged view in the area where the spherical trimming lens is located;

[0029] Figure 7 Optical path schematic diagram of a preferred embodiment of the projection optical machine provided by the present invention;

[0030] Figure 8 One of the three-dimensional structure schematic diagrams of a preferred embodiment of the spherical trimming lens provided by the present invention;

[0031] Figure 9 Another three-dimensional structure schematic diagram of a preferred embodiment of the spherical trimming lens provided by the present invention;

[0032] Figure 10 Schematic diagram of the manufacturing process of a preferred embodiment of the spherical trimming lens provided by the present invention;

[0033] Figure 11 Schematic diagram of the matching structure between the trimming lens mounting structure and the spherical trimming lens provided by the present invention;

[0034] Figure 12 One of the three-dimensional structure schematic diagrams of the trimming lens mounting structure provided by the present invention;

[0035] Figure 13 Another three-dimensional structure schematic diagram of the trimming lens mounting structure provided by the present invention;

[0036] Figure 14 The third three-dimensional structure schematic diagram of the trimming lens mounting structure provided by the present invention;

[0037] Figure 15 This is a partial structural schematic diagram of the projection optical machine provided by the present invention in the area where the spherical edge-cutting lens is located after removing one side cover plate;

[0038] Figure 16 This is one of the partial structural schematic diagrams of the housing of the projection optical machine provided by the present invention in the area where the spherical edge-cutting lens is located;

[0039] Figure 17 This is the second partial structural schematic diagram of the housing of the projection optical machine provided by the present invention in the area where the spherical edge-cutting lens is located. Detailed implementation manners

[0040] The following describes the present invention 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.

[0041] 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.

[0042] 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".

[0043] 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.

[0044] A projection optical machine, see attached Figure 1 - attached Figure 6 , including a housing and a light source module 100, a lens module 200, a DMD module 300, and an optical adjustment module 400 installed in the housing. The optical adjustment module 400 includes a fly-eye lens 420, a spherical lens assembly 410, and a prism assembly 430.

[0045] The DMD module 300, the prism assembly 430, and the lens module 200 are arranged in sequence along a first direction, and the fly-eye lens 420, the spherical lens assembly 410, and the prism assembly 430 are arranged in sequence along a second direction. Among them, the direction parallel to the optical axis 230 of the lens module 200 is the first direction, and the direction perpendicular to the optical axis 230 of the lens module 200 is the second direction;

[0046] The spherical lens assembly 410 includes a first spherical edge lens 411, a second spherical edge lens 412, and a third spherical edge lens 413 arranged in sequence between the compound eye lens 420 and the prism assembly 430. Each of the spherical edge lenses is a part of a spherical glass lens. Each of the spherical edge lenses includes an outgoing light surface, an incoming light surface, and a side surface; see the attached Figure 8 and the attached Figure 9 , the side surface of each of the spherical edge lenses includes an upper cutting surface 13, a lower cutting surface 14, a side edge surface 15, and a side cutting surface 16 opposite to the side edge surface 15. The side edge surface 15 is a part of the edge surface of the spherical glass lens; each spherical edge lens includes a first end and a second end. Among them, the end where the side edge surface 15 is located is the first end, and the end where the side cutting surface 16 is located is the second end;

[0047] In the first direction, the first ends 17 of the first spherical edge lens 411 and the second spherical edge lens 412 are closer to the DMD module 300 than the second ends 18, and the second end 18 of the third spherical edge lens 413 is closer to the DMD module 300 than the first end 17;

[0048] In the second direction, the first end 17 of the first spherical edge lens 411 is closer to the compound eye lens 420 than the second end 18. The distance between the second end 18 of the second spherical edge lens 412 and the second end 18 of the first spherical edge lens 411 is less than the distance between the first end 17 of the second spherical edge lens 412 and the first end 17 of the first spherical edge lens 411. The distance between the second end 18 of the third spherical edge lens 413 and the first end 17 of the second spherical edge lens 412 is less than the distance between the first end 17 of the third spherical edge lens 413 and the second end 18 of the second spherical edge lens 412;

[0049] The space occupied by the first spherical edge lens 411, the second spherical edge lens 412, and the third spherical edge lens 413 in the second direction causes there to be a spacing dimension L1 in the second direction between the compound eye lens 420 and the optical axis 230 of the lens module 200.

[0050] The lens module 200 includes an ultra-short focal length lens. The lens barrel of the ultra-short focal length lens includes a lens barrel side wall close to the light source module. The minimum distance dimension from the lens barrel side wall to the optical axis of the lens module is L2, and L1 > L2.

[0051] Specifically, in combination with the attached drawings of the specification Figure 7The optical path schematic diagram of the projection optical machine of the present invention only shows the optical path after retaining the optical path participating components. The projection optical machine provided by the present invention uses three spherical edge-cutting lenses to form a lens assembly. The three spherical edge-cutting lenses are arranged in sequence between the fly-eye lens and the prism assembly, and in the first and second directions, the arrangement of the three spherical edge-cutting lenses meets the specific setting requirements of the present invention. Thus, the light rays emitted by the light source assemblies respectively located on the first side surface 110 and the second side surface 120 of the light source module 100 enter the fly-eye lens 420 in the optical adjustment module 400 along the second direction and then exit. The aforementioned exiting light rays first pass through the first spherical edge-cutting lens 411 and then enter the second spherical edge-cutting lens 412. At this time, since the first spherical edge-cutting lens 411 is arranged on the main optical path behind the fly-eye lens 420, the light rays passing through the fly-eye lens 420 can basically pass through the first spherical edge-cutting lens 411 and exit. And because in the first direction, the first end 17 of the first spherical edge-cutting lens 411 and the second spherical edge-cutting lens 412 is closer to the DMD module 300 than the second end 18, and in the second direction, the first end 17 of the first spherical edge-cutting lens 411 is closer to the fly-eye lens 420 than the second end 412, and the distance between the second end 18 of the second spherical edge-cutting lens 412 and the second end 18 of the first spherical edge-cutting lens 411 is less than the distance between the first end 17 of the second spherical edge-cutting lens 412 and the first end 17 of the first spherical edge-cutting lens 411. Therefore, the light rays exiting after passing through the first spherical edge-cutting lens 411 can basically enter the second spherical edge-cutting lens 412 and then be emitted in a predetermined direction to the third spherical edge-cutting lens 413. And the second end 18 of the third spherical edge-cutting lens 413 is closer to the DMD module 300 than the first end 17, and the distance between the second end 18 of the third spherical edge-cutting lens 413 and the first end 17 of the second spherical edge-cutting lens 412 is less than the distance between the first end 17 of the third spherical edge-cutting lens 413 and the second end 18 of the second spherical edge-cutting lens 412. Therefore, the light rays exiting the second spherical edge-cutting lens 412 can basically enter the third spherical edge-cutting lens 413. Through the specific shape and positional relationship settings of the above three spherical edge-cutting lenses, the light rays coming out of the fly-eye lens can be reshaped from a circular light spot with a square aperture angle to a square light spot with a circular aperture angle that matches the size of the DMD. The square light spot is as close as possible to the size of the DMD to improve the overall efficiency of the optical machine, that is, it can make the light rays emitted by the light source module 100, after passing through the fly-eye lens 420, pass through the lens assembly 410 as much as possible and then enter the prism assembly 430, and then enter the DMD module 300, so that the DMD reflects to form the effective light rays for the incident lens module to complete the projection work, reducing the light loss during the propagation process. Combined with the appendix Figure 3, while allowing as much effective light as possible to enter the DMD module to improve the overall efficiency of the digital projection device, the space occupied by the three spherical edge lenses in the second direction results in an interval dimension L1 in the second direction between the compound eye lens 420 and the optical axis of the lens module 100. The significance of the interval dimension L1 is that it can meet the installation requirements of the ultra-short focus lens.

[0052] Furthermore, for this lens assembly, there is no need to set a reflector on the optical adjustment module 400 to refract the propagating light at a large angle so that it enters the subsequent module along the effective propagation direction. Excluding the setting of the reflector, on the one hand, it simplifies the structure inside the projection optical machine, and on the other hand, it can also avoid the extra workload caused by the need to adjust the reflector when using the reflector and the problem of the optical path propagation error caused by the inaccurate correction of the reflector.

[0053] At the same time, since these three spherical edge lenses are part of a spherical glass lens, and the processing equipment for the spherical glass lens is a general-purpose equipment without the need to set a specific mold, thus reducing the development cost of the optical machine. When one spherical glass lens can be made into two spherical edge lenses, the production cost can be further saved, especially suitable for the development and production of small-batch optical machines. Those skilled in the art can understand that the respective sizes of the three spherical edge lenses can be designed separately according to actual needs, and it is not required that the size relationships among the first spherical edge lens, the second spherical edge lens, and the third spherical edge lens are exactly the same.

[0054] Optionally, the barrel of the ultra-short focus lens is axially divided into multiple segments with different outer diameters. Among them, the first segment 210 adjacent to the housing has the smallest outer diameter. The first segment includes a first side wall 211 close to the light source module, and the interval dimension L2 is the distance between the first side wall 211 and the optical axis 230 of the lens module.

[0055] Compared with other types of lenses (such as telephoto lenses), the ultra-short focus lens is significantly larger in size. Therefore, in the design of the optical machine, on the one hand, it is necessary to consider avoiding the loss during the light propagation process and taking into account the current mainstream consumers' demand for the miniaturization of the optical machine, and on the other hand, enough space should be reserved for the installation of the ultra-short focus lens. Since in the technical solution provided by the present invention, the optical path is adjusted by the specific cooperation of three spherical edge lenses, the setting of the three spherical edge lenses makes the interval L1 between the compound eye lens 420 and the optical axis 230 of the lens module 200 in the second direction meet the requirement that the first segment of the barrel of the ultra-short focus lens close to the housing of the digital projection device can be smoothly installed on the housing of the digital projection device without being interfered by the light source module located in front of the compound eye lens.

[0056] Optionally, the barrel of the ultra-short focus lens further includes a second section 220 in the axial direction. The second section 220 includes a second side wall 221 close to the light source module. In the second direction, the minimum distance dimension L3 from the second side wall 221 to the optical axis 230 of the lens module 200 satisfies L3≥L1. The second section 200 includes a rear wall 222 close to the DMD module, and the distance between the rear wall 222 and the DMD module 300 is X. The light source module 100 includes a front wall 110 far from the DMD module 300, and the distance between the front wall 110 and the DMD module 300 is Y, where X>Y.

[0057] The present invention adjusts the optical path by means of a specific arrangement of three spherical edge-cut lenses in the second direction. In the first direction, the bottom wall of the light source module can be adaptively lower than the three spherical edge-cut lenses, and thus the distance Y from the top wall of the light source module to the DMD module can be significantly smaller than the distance X from the bottom wall of the second section of the barrel of the ultra-short focus lens to the DMD module. In this way, although in the second direction, the minimum distance dimension L3 from the second side wall to the optical axis of the lens module is greater than or equal to L1, the setting of the second section 220 will not be interfered by the light source module 100, ensuring the normal installation and use of the ultra-short focus lens.

[0058] Those skilled in the art can understand that since the size of the ultra-short focus lens is usually significantly larger than that of a normal-focus lens or a telephoto lens, the technical solution of the present invention can meet the installation and use requirements of the ultra-short focus lens. Obviously, it can also fully meet the normal installation and use requirements of a normal-focus lens or a telephoto lens.

[0059] Optionally, referring to the attached Figure 4 , the prism assembly 430 includes a first prism 431 and a second prism 432 with a triangular cross-section. The first prism 431 includes a bottom surface 4311 and a first side surface 4312, and an obtuse angle is formed between the bottom surface 4311 and the first side surface 4312. The bottom surface 4311 faces the DMD module 300, and the first side surface 4312 faces the light-emitting surface of the third spherical edge-cut prism 413.

[0060] Specifically, the prism assembly 430 is set to be a first prism 431 and a second prism 432 with a triangular cross section, and the first side surface 4312 included in the first prism 431 is adjacent to the light-emitting surface of the third spherical cut-edge prism 413, so that the light emitted from the third spherical cut-edge prism 413 can be incident on the prism assembly 430 as fully as possible, further reducing the light loss during the propagation process; further, the arrangement of the above-mentioned compound eye lens 420 and the prism assembly 430 is coordinated with the specific spherical lens assembly 410 composed of the above-mentioned three spherical cut-edge lenses, on the one hand, it can ensure that as much effective light as possible is incident on the DMD module during the light propagation process, and on the other hand, it is conducive to the compact structure and further miniaturization of the optical machine. The cross-sectional shape of the first prism is preferably an obtuse triangle, and in order to facilitate manufacturing and avoid blocking the OFF light transmission route, the cross-sectional shape of the second prism is preferably a right triangle.

[0061] Optionally, the first spherical edge-cut lens 411, the second spherical edge-cut lens 412 and the third spherical edge-cut lens 413 are all formed by dividing a spherical glass lens, and are all smaller than half of the corresponding spherical glass lens, so that one spherical glass lens can be divided into two of the first spherical edge-cut lenses 411 or two of the second spherical edge-cut lenses 412 or two of the third spherical edge-cut lenses 413.

[0062] Specifically, the two first spherical edge-cut lenses 411 can be formed by splitting a spherical glass lens, the two second spherical edge-cut lenses 412 can be formed by splitting a spherical glass lens, and the two third spherical edge-cut lenses 413 can be formed by splitting a spherical glass lens. That is to say, for a complete spherical glass lens, it can be split to form two spherical edge-cut glass lenses. In this way, three complete spherical glass lenses can be processed to form two sets of spherical edge-cut glass lenses for two optical machines, thereby further reducing the production cost of the optical machine, which is particularly suitable for the development and production of small-batch optical machines.

[0063] Specifically, as an optional manufacturing method, when manufacturing the spherical edged lens of the present invention, a spherical glass lens with a circular cross section that meets the size requirements is taken, and the lens is clamped along the two ends of a diameter of the spherical glass lens, and then, as shown in FIG. Figure 10 As shown, the grinding is symmetrical on both sides along the diameter direction perpendicular to the aforementioned diameter (reference Figure 10(in the direction indicated by the arrow in [Fig. 0]), after reaching the predetermined grinding amount, the ground lens is cut into at least two parts (for example, a ground spherical glass lens can be cut twice to form two spherical edge lenses each smaller than half of the ground spherical glass lens and a discarded part in the middle; or the ground spherical glass lens can be cut only once to form two symmetric spherical edge lenses). The upper and lower surfaces formed by grinding are respectively the upper and lower cut surfaces of the formed spherical edge lens, and the cut surface formed by cutting is the side cut surface of the spherical edge lens. The side edge surface is a part of the edge surface of the circular spherical glass lens, and the incident surface and the exit surface are also the incident / exit surfaces of the spherical glass lens. Those skilled in the art know that after cutting, the area where the side cut surface is located can be further polished until the parts that do not need to transmit light are basically ground away to form the final cut-edge lens product, so that the size of the spherical edge lens is further reduced, which is beneficial to the more miniaturization of the optical-mechanical structure.

[0064] Optionally, at least one of the exit surface or the incident surface of each spherical edge lens is a convex surface. Refer to the attached Figure 11 - attached Figure 14 , each spherical edge lens is provided with a cut-edge lens mounting structure 500. The cut-edge lens mounting structure includes a positioning mounting frame 510. Each spherical edge lens is positioned and mounted in the corresponding positioning mounting frame. On the inner wall of the positioning mounting frame, there is a first arc-shaped positioning surface 511 that cooperates with the periphery of a convex surface, an upper positioning surface 512 that cooperates with the upper cut surface, a lower positioning surface 513 that cooperates with the lower cut surface, and a second arc-shaped positioning surface 514 that cooperates with the side edge surface. There is a gap between the frame body of the positioning mounting frame opposite to the side cut surface and the side cut surface 16. An elastic member 710 is arranged in the gap, and the elastic member 710 presses the spherical edge lens against the second arc-shaped positioning surface 514.

[0065] When manufacturing the spherical edge lens of the present invention according to the method described above, the upper cut surface 13 and the lower cut surface 14 of the spherical edge lens are accurate surfaces (it can be understood that the upper and lower cut surfaces described here are not limited to being formed by cutting. In the present invention, in order to ensure accuracy, preferably, the upper and lower cut surfaces are formed by grinding). Since the side edge surface 15 is a part of the edge surface inherent to the circular spherical glass lens itself, the side edge surface 15 is also an accurate surface; the side cut surface 16 is the surface formed after cutting the circular spherical glass lens. Since it is a cut, the accuracy is low, and the side cut surface 16 is an inaccurate surface. Therefore, in order to ensure the positioning accuracy of the spherical edge lens, its side cut surface cannot be used as a positioning surface. In the present invention, the convex surface 11, the upper cut surface 13, the lower cut surface 14, and the side edge surface 15 are selected as the positioning surfaces of the spherical edge lens, and a specific positioning structure is set to achieve the accurate positioning of the spherical edge lens.

[0066] If the positioning structure is directly set on the housing of the optical engine, due to limitations such as the demolding direction, the addition of the positioning structure will greatly increase the difficulty of the structural design of the optical engine housing. Therefore, the present application provides a trimming lens mounting structure 500 for mounting a spherical trimming lens in the optical engine housing. The trimming lens mounting structure includes a positioning mounting frame 510. The spherical trimming lens is positioned and mounted on the positioning mounting frame 510, and then the integral structural member formed by the spherical trimming lens and the positioning mounting frame 510 is integrally positioned in the optical engine housing. In this way, both the positioning of the spherical trimming lens can be ensured and the processing of the optical engine is facilitated. Specifically, as shown in the attached Figure 12 to the attached Figure 14 figures, on the inner wall of the positioning mounting frame 510, there are provided a first arc-shaped positioning surface 511 that cooperates with the periphery of the convex surface, an upper positioning surface 512 that cooperates with the upper cutting surface, a lower positioning surface 513 that cooperates with the lower cutting surface, and a second arc-shaped positioning surface 514 that cooperates with the side edge surface. There is a gap 620 between the frame body of the positioning mounting frame 510 opposite to the side cutting surface and the side cutting surface. An elastic member 710 is arranged in the gap 620, and the elastic member 710 presses the spherical trimming lens towards the second arc-shaped positioning surface 514.

[0067] In this way, using the convex surface 11 of the spherical trimming lens as the main positioning surface, and cooperating with the upper cutting surface 13, the lower cutting surface 14, and the original side edge surface 15 of the spherical trimming lens to achieve precise positioning of the spherical trimming lens. The side cutting surface 16 that may not be accurate is not used as a positioning surface, but an elastic member 710 is arranged between the side cutting surface 16 and the positioning mounting frame 510. The elastic member 710 presses the spherical trimming lens tightly against the second arc-shaped positioning surface 514, thereby precisely positioning the spherical trimming lens in the positioning mounting frame 510. The elastic member 710 can be any structure that can provide an elastic force to press the spherical trimming lens against the second arc-shaped positioning surface 514, such as a spring, a gasket, etc. Preferably, the elastic member 710 is a silica gel pad. The silica gel pad and the spherical trimming lens can maintain a sufficiently large contact area, so as to ensure the uniformity of the elastic force in the direction of the second arc-shaped positioning surface 514 received by the spherical trimming lens, and avoid displacement of the spherical trimming lens due to uneven force, thereby affecting the positioning accuracy.

[0068] Furthermore, referring to the attached Figure 11 - the attached Figure 17 figures, a first positioning structure 610 is arranged on the outside of the positioning mounting frame 510. The lens mounting structure further includes a second positioning structure 630 arranged on the inner side wall of the optical engine housing. The precise positioning of the positioning mounting frame in the optical engine housing is achieved through the cooperation of the first positioning structure and the second positioning structure, and further, the spherical trimming lens in the positioning mounting frame is precisely positioned in the optical engine housing.

[0069] In a preferred embodiment, as shown in the attached Figure 12 、 14and the attached drawings Figures 15 - 17 As shown in the figure, the first positioning structure includes a positioning protrusion 610 provided on the outer side surface of the positioning and mounting frame, and the second positioning structure includes a positioning groove 630 provided on the inner side wall of the optical machine housing. The positioning groove 630 is provided on a protruding structure 640 protruding from the inner side wall of the housing of the optical machine. The positioning protrusion 610 is embedded in the positioning groove 630 to install the trimming lens mounting structure in the housing.

[0070] Due to the limited thickness of the optical machine housing, directly opening a positioning groove on the optical machine housing will affect the overall structural strength of the optical machine housing. Therefore, preferably, as shown in the attached drawings Figure 16 and the attached drawings Figure 17 As shown, a protruding structure 640 is provided protruding from the inner side wall of the optical machine housing, and the positioning groove is provided on the protruding structure 640. Adjacent spherical trimming lenses can share the protruding structure 640, that is, a plurality of positioning grooves 630 corresponding to the positioning and mounting frames of different spherical trimming lenses are provided on the protruding structure 640. After the positioning and mounting frame 510 is installed in the optical machine housing, the positioning and mounting frame 510 can be pressed by a cover plate on the optical machine housing to restrict its movement in the up and down directions.

[0071] Optionally, the incident surface of the first spherical trimming lens 411 is a convex surface, and the exit surface is a concave surface or a flat surface; the incident surface of the second spherical trimming lens 412 is a concave surface or a flat surface, and the exit surface is a convex surface; the incident surface of the third spherical trimming lens 413 is a convex surface, and the exit surface is a convex surface, a concave surface or a flat surface.

[0072] In order to play a role in converging light, at least one of the incident surfaces and the incident surfaces of each spherical trimming lens should be a convex surface. Further, it is selected that the incident surfaces of the first spherical trimming lens and the third spherical trimming lens are convex surfaces, the exit surfaces are concave surfaces or flat surfaces, and the incident surface of the second spherical trimming lens is a concave surface or a flat surface, and the exit surface is a convex surface, so as to further adjust the optical path so that it propagates along a predetermined specific direction.

[0073] Optionally, referring to the attached drawings Figure 3 and the attached drawings Figure 4 , the light source module includes a collimating lens assembly 160, and both the collimating lens assembly 160 and the fly-eye lens 420 are made of plastic lenses.

[0074] In order to homogenize the light emitted by the light source in the light source module, make it incident on the fly-eye lens 420 at an as parallel angle as possible, and avoid the ineffective stray light caused by large-angle incidence on the fly-eye lens 420, a collimating lens assembly 160 is provided in the light source module for homogenizing light. Since the collimating lens assembly 160 and the fly-eye lens 420 do not focus light, their heat generation is relatively low. Considering the further manufacturing cost, plastic lenses can be used to manufacture the collimating lens assembly 160 and the fly-eye lens 420.

[0075] In a second aspect, the present invention further provides a projector, including a projection optical engine as described above.

[0076] It should be understood that the above 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 a housing and a light source module, a lens module, a DMD module and an optical adjustment module installed in the housing. The optical adjustment module includes a compound eye lens, a spherical lens assembly and a prism assembly, and is characterized in that: The DMD module, the prism assembly, and the lens module are arranged in sequence along a first direction, and the fly-eye lens, the spherical lens assembly, and the prism assembly are arranged in sequence along a second direction. Wherein, the direction parallel to the optical axis of the lens module is the first direction, and the direction perpendicular to the optical axis of the lens module is the second direction; The spherical lens assembly includes a first spherical trimmed lens, a second spherical trimmed lens, and a third spherical trimmed lens arranged in sequence between the fly-eye lens and the prism assembly. Each spherical trimmed lens is a part of a spherical glass lens, and each spherical trimmed lens includes an outgoing surface, an incoming surface, and a side surface; the side surface includes an upper trimmed surface, a lower trimmed surface, a side edge surface, and a side trimmed surface opposite to the side edge surface, and the side edge surface is a part of the edge surface of the spherical glass lens; each spherical trimmed lens includes a first end and a second end, wherein, the end where the side edge surface is located is the first end, and the end where the side trimmed surface is located is the second end; In the first direction, the first ends of the first spherical trimmed lens and the second spherical trimmed lens are closer to the DMD module than the second ends, and the second end of the third spherical trimmed lens is closer to the DMD module than the first end; In the second direction, the first end of the first spherical trimmed lens is closer to the fly-eye lens than the second end, the distance between the second end of the second spherical trimmed lens and the second end of the first spherical trimmed lens is less than the distance between the first end of the second spherical trimmed lens and the first end of the first spherical trimmed lens, and the distance between the second end of the third spherical trimmed lens and the first end of the second spherical trimmed lens is less than the distance between the first end of the third spherical trimmed lens and the second end of the second spherical trimmed lens; The space occupied by the first spherical trimmed lens, the second spherical trimmed lens, and the third spherical trimmed lens in the second direction results in an interval dimension L1 in the second direction between the fly-eye lens and the optical axis of the lens module; The lens module includes an ultra-short focal length lens, and the lens barrel of the ultra-short focal length lens includes a lens barrel side wall close to the light source module. The minimum distance dimension from the lens barrel side wall to the optical axis of the lens module is L2, and L1 > L2.

2. The projection optical machine according to claim 1, characterized in that: The lens barrel of the ultra-short focal length lens is divided into multiple segments with different outer diameters axially. Among them, the segment adjacent to the housing is the first segment, and the outer diameter of the first segment is the smallest. The first segment includes a first side wall close to the light source module, and the interval dimension L2 is the distance between the first side wall and the optical axis of the lens module.

3. The projection optical machine according to claim 2, characterized in that: The lens barrel of the ultra-short focal length lens further includes a second segment axially. The second segment includes a second side wall close to the light source module. In the second direction, the minimum distance dimension from the second side wall to the optical axis of the lens module is L3, and L3 ≥ L1. The second segment includes a rear wall close to the DMD module, and the distance between the rear wall and the DMD module is X; the light source module includes a front wall far from the DMD module, and the distance between the front wall and the DMD module is Y, and X > Y.

4. The projection optical machine according to claim 1, characterized in that: The prism assembly includes a first prism and a second prism with a triangular cross-section. The first prism includes a bottom surface and a first side surface. An obtuse angle is formed between the bottom surface and the first side surface. The bottom surface faces the DMD module, and the first side surface faces the light-emitting surface of the third spherical edge-cutting lens.

5. The projection optical machine according to claim 1, characterized in that: The first spherical edge-cutting lens, the second spherical edge-cutting lens, and the third spherical edge-cutting lens are all formed by dividing a spherical glass lens, and each is less than one-half of the corresponding spherical glass lens, so that one spherical glass lens can be divided into two of the first spherical edge-cutting lenses or two of the second spherical edge-cutting lenses or two of the third spherical edge-cutting lenses.

6. The projection optical machine according to claim 1, characterized in that: At least one of the light-emitting surface or the light-incident surface of each spherical edge-cutting lens is a convex surface. Each spherical edge-cutting lens is provided with an edge-cutting lens mounting structure. The edge-cutting lens mounting structure includes a positioning mounting frame. Each spherical edge-cutting lens is positioned and mounted in the corresponding positioning mounting frame. On the inner wall of the positioning mounting frame, there are provided a first arc-shaped positioning surface that cooperates with the periphery of the convex surface, an upper positioning surface that cooperates with the upper cutting surface, a lower positioning surface that cooperates with the lower cutting surface, and a second arc-shaped positioning surface that cooperates with the side edge surface. There is a gap between the frame body of the positioning mounting frame opposite to the side cutting surface and the side cutting surface. An elastic member is provided in the gap, and the elastic member presses the spherical edge-cutting lens against the second arc-shaped positioning surface.

7. The projection optical machine according to claim 6, characterized in that: A positioning protrusion is provided on the outer side of the positioning mounting frame. A protrusion structure is protrudingly provided on the inner side wall of the housing of the optical engine. A positioning groove is provided on the protrusion structure, and the positioning protrusion is embedded in the positioning groove to mount the edge-cutting lens mounting structure in the housing.

8. The projection optical machine according to any one of claims 1-7, characterized in that: The light source module includes a collimating lens assembly, and both the collimating lens assembly and the fly-eye lens are made of plastic lenses.

9. A projector, characterized in that, Including the projection optical engine according to any one of claims 1-8.

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