Lens, preparation method and ray machine module

Abstract

The invention provides a lens, a preparation method and an optical machine module, and relates to the technical field of lenses. The orthographic projection of the lens is annular and comprises an arc curve, a first end point, a second end point and a conic curve connecting the first end point and the second end point. The included angle between the straight line connecting the first end point and the second end point and the horizontal line is an acute angle.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and particularly relates to a lens, a preparation method thereof, and an optical engine module. Background Art

[0002] VR (Virtual Reality) technology, also known as virtual environment technology, is a brand-new and practical technology developed in the 20th century. The characteristics of VR technology such as existence, multi-sensory perception, and interactivity have made it popular among users, and the demand for VR in all walks of life is increasing.

[0003] In order to increase the field of view angle of VR devices, the diameter of the optical engine module in VR devices needs to be enlarged. However, if the module diameter is too large, it will interfere with the bridge of the nose. In addition, although some lenses are disclosed in the prior art, they cannot be applied to both the left and right optical engine modules simultaneously, resulting in poor applicability. Summary of the Invention

[0004] An embodiment of the present invention provides a lens, aiming to solve the technical problems that the existing lenses for optical engine modules interfere with the bridge of the nose and cannot be applied to both the left and right optical engine modules simultaneously.

[0005] On the one hand, the present application provides a lens. The orthographic projection of the lens is annular. The orthographic projection of the lens includes an arc curve, a first endpoint, a second endpoint, and a conic curve connecting the first endpoint and the second endpoint; the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is an acute angle.

[0006] In some embodiments of the present application, the curvature at the connection of the arc curve and the conic curve changes gradually.

[0007] In some embodiments of the present application, the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 20° and 90°;

[0008] Preferably, the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 30° and 60°;

[0009] And / or, the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 35° and 80°;

[0010] And / or, the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 45° and 70°;

[0011] And / or, the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 55° and 65°.

[0012] In some embodiments of the present application, the curvature of the conic curve is between 0.3 and 0.7;

[0013] Preferably, the curvature of the conic curve is between 0.4 and 0.6;

[0014] Preferably, the curvature of the conic curve is between 0.45 and 0.55.

[0015] On the other hand, the present application provides an optical engine module for a VR device. The optical engine module includes a lens barrel and the lens, and the lens is disposed inside the lens barrel.

[0016] In some embodiments of the present application, the optical engine module further includes a screen module. The lens barrel includes a first port and a second port disposed opposite to each other. An accommodation cavity communicating the first port and the second port is provided inside the lens barrel. The lens is located inside the accommodation cavity and seals the second port, and the screen module is sealingly connected to the first port.

[0017] In some embodiments of the present application, the screen module includes a screen bracket and a display screen. A through hole is provided on the screen bracket, and an installation groove is provided on a side of the screen bracket facing away from the display screen. The installation groove is disposed along the outer edge of the through hole, and the installation groove has a first stepped surface;

[0018] The first port is provided with a second stepped surface that cooperates with the first stepped surface, and the first stepped surface and the second stepped surface are sealingly connected.

[0019] In some embodiments of the present application, a boss is provided on the side wall of the accommodation cavity, and the boss extends toward the middle of the accommodation cavity; a dispensing step is provided on the periphery of the lens, and the dispensing step and the side wall of the accommodation cavity enclose a dispensing groove.

[0020] In some embodiments of the present application, the optical engine module further includes a filter screen. An air hole extending in a curve is provided on the side wall of the lens barrel, and the air hole communicates the external space with the accommodation cavity; the filter screen is disposed on the side wall.

[0021] In some embodiments of the present application, the optical engine module further includes a screen bracket, a display screen, and an easy-pull glue; the easy-pull glue is disposed on the screen bracket; the easy-pull glue includes a main body and a pulling part connected to each other, the pulling part is exposed outside the display screen, and the pulling part is in an "L" shape.

[0022] Advantages of the present application:

[0023] In the lens of the present application, since the periphery of the lens includes a conic curve, and the angle between the straight line connecting the first end point and the second end point and the horizontal line is an acute angle, and the conic curve is arranged on the side close to the user's nose bridge, the lens in the present application can avoid interference with the nose bridge, and through the above structural design, the lens in the present application is a rotationally symmetric structure, so that it can be applied to the left and right optical engine modules in the VR device at the same time, thereby improving the applicability of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] In order to more fully understand the present invention and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0026] Figure 1 Schematic perspective structure diagram of the first embodiment of the optical engine module in the present application;

[0027] Figure 2 Schematic cross-sectional view of the second embodiment of the optical engine module in the present application;

[0028] Figure 3 is Figure 2 Local enlarged structure diagram at position A in;

[0029] Figure 4 Schematic structure diagram of an embodiment of the screen bracket in the present application;

[0030] Figure 5 is Figure 4 Local enlarged structure diagram at position D in;

[0031] Figure 6 Schematic assembly structure diagram of the lens and the lens barrel in the present application;

[0032] Figure 7 is Figure 6 Local enlarged structure diagram at position B in;

[0033] Figure 8 is Figure 6 Local enlarged structure diagram at position C in;

[0034] Figure 9 Explosion diagram of the third embodiment of the optical engine module in the present application;

[0035] Figure 10It is a schematic structural diagram of an embodiment of the lens barrel in the present application;

[0036] Figure 11 is Figure 10 a partial enlarged structural diagram of the E position in

[0037] Figure 12 It is a schematic structural diagram of an embodiment of the lens in the present application;

[0038] Figure 13 It is a cross-sectional view of the air hole in the present application;

[0039] Figure 14 It is a schematic structural diagram of an embodiment of the filter screen in the present application;

[0040] Figure 15 It is a schematic structural diagram of the easy-pull glue and the screen bracket in the present application;

[0041] Figure 16 It is a schematic structural diagram of the second embodiment of the lens in the present application;

[0042] Figure 17 It is a schematic structural diagram of the third embodiment of the lens in the present application;

[0043] Figure 18 It is a partial structural schematic diagram of an embodiment of the initial lens in the present application.

[0044] Reference numerals in the drawings: 100, optical engine module; 10, lens barrel; 11, first port; 12, accommodation cavity; 13, boss; 14, second positioning portion; 15, second port; 16, air hole; 161, first conduction section; 162, second conduction section; 17, positioning groove; 20, display screen; 30, screen bracket; 31, first through hole; 32, installation groove; 32a, glue overflow groove; 321, first stepped surface; 3211, first step surface; 3212, first connection surface; 3213, second step surface; 3214, third connection surface; 322, bottom surface; 323, outer side surface; 33, second fastening hole; 34, bottom plate; 341, side edge; 35, side plate; 351, notch; 40, lens; 41, dispensing step; 41a, dispensing groove; 42, first positioning portion; 43, polarization reflection film; 44, arc curve; 45, conic curve; 451, first end point; 452, second end point; 46, rounded corner; 47, sacrificial area; 48, sacrificial curve; 50, filter screen; 51, baffle; 52, grille; 60, easy-pull glue; 61, body; 611, second through hole; 612, avoidance hole; 62, pulling part; 621, connecting part; 622, flanging part; 70, front cover.

[0045] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0047] Please refer to Figures 1 to 15 , an optical engine module 100 is provided in an embodiment of the present application. The optical engine module 100 includes a screen bracket 30, a display screen 20, and an easy-pull adhesive 60. Among them, please refer to Figure 9 and Figure 15 , the easy-pull adhesive 60 is disposed on the screen bracket 30 and is used to adhere the display screen 20; the easy-pull adhesive 60 includes a main body 61 and a pulling part 62 connected to each other. The pulling part 62 is exposed outside the display screen 20, and the pulling part 62 is in the shape of the letter "L".

[0048] It can be understood that in the prior art, the display screen 20 is generally adhered to the screen bracket 30 by dispensing glue. During disassembly, it is necessary to heat the glue to melt it so that the display screen can be easily separated from the screen bracket. However, there is a problem that residual glue is likely to appear at some glue-bonding places, which is not convenient for cleaning. And during disassembly, due to the action of the residual glue, part of the surface of the display screen is likely to be bent due to tearing.

[0049] In view of the above at least one technical problem in the prior art, the easy-pull adhesive 60 is provided in the optical engine module 100 of the present application. The display screen 20 is adhered to the screen bracket 30 by the easy-pull adhesive 60, and the pulling part 62 is provided on the easy-pull adhesive 60. The pulling part 62 is exposed outside the display screen 20. Compared with the prior art, when it is necessary to disassemble the display screen 20, in the present application, only the pulling part 62 needs to be pulled to extract the easy-pull adhesive 60 from between the screen bracket 30 and the display screen 20, realizing the separation of the display screen 20 and the screen bracket 30, thereby facilitating the operator to disassemble the optical engine module 100. And after the easy-pull adhesive 60 is extracted, no residual glue will be generated on the screen bracket 30 or the display screen 20, improving the cleaning efficiency, and the display screen will not be deformed or damaged during the disassembly process.

[0050] It should be noted that the easy-pull adhesive 60 in the present application is also called a trace-free tape in the industry, which is a stretchable double-sided tape. The easy-pull adhesive 60 in the present application can not only firmly bond the display screen 20 and the screen bracket 30 together, but also easily remove the easy-pull adhesive 60 between the display screen 20 and the screen bracket 30 by pulling the pulling part 62 when it is necessary to disassemble the optical engine module 100, and no residual glue will be left.

[0051] Exemplarily, the easy-to-pull adhesive 60 includes a carrier layer and an adhesive layer. The adhesive layer is disposed on the front and back surfaces of the carrier layer. A release film layer is provided on the side of the adhesive layer facing away from the carrier layer. The material of the carrier layer can be thermoplastic polyurethane elastomer rubber, and the material of the adhesive layer can be butyl rubber adhesive. The specific composition of the easy-to-pull adhesive 60 does not belong to the main improvement point of this application and is not limited herein. To facilitate the installation and positioning of the easy-to-pull adhesive 60, positioning holes can be provided on the release film layer. After the easy-to-pull adhesive 60 is assembled to a predetermined position, the release film layer thereon is removed. Specifically in this application, since a second through hole 611 is provided at the center of the easy-to-pull adhesive 60, positioning holes can be provided at positions corresponding to the second through hole 611 on the release film layer (for example, 4 circular positioning holes are provided in the middle of the release film), so as to facilitate the positioning of the easy-to-pull adhesive 60 with the jig. After removing the release film on one side of the easy-to-pull adhesive 60, the screen bracket 30 is also positioned by the jig and then adhered to the easy-to-pull adhesive 60. After the easy-to-pull adhesive 60 is installed at the preset position on the screen bracket 30, the release film layer on the other surface of the easy-to-pull adhesive 60 is removed, and then the display screen 20 is adhered to the side of the easy-to-pull adhesive 60 facing away from the screen bracket 30, so that the display screen 20 can be installed and fixed on the screen bracket 30.

[0052] In some embodiments of the present application, please refer to Figure 15 , the pulling part 62 includes a connecting part 621 and a flanging part 622 that are connected to each other. The connecting part 621 is connected to the body 61 and is located on the same plane as the body 61. The flanging part 622 is disposed at an angle to the connecting part 621. Exemplarily, the flanging part 622 is perpendicular to the connecting part 621. In this embodiment, the connecting part 621 of the pulling part 62 is connected to the body 61 and is located on the same plane as the body 61, so that when the operator pulls the pulling part 62, the pulling part 62 can directly transmit the pulling force to the body 61 through the connecting part 621 to move the body 61 along the stretching direction. In addition, since the flanging part 622 is perpendicular to the connecting part 621, it is further convenient for the operator to pull the pulling part 62, and the size of the easy-to-pull adhesive 60 on the plane where the body 61 is located is small, which is beneficial to improving the structural compactness of the optical engine module 100.

[0053] Specifically, the connecting part 621 is generally square. The connecting part 621 is formed by extending outward (that is, in the direction away from the center of the second through hole 611) from a part near the middle of a certain side (for example, Figure 15 the left side) of the body 61 to form a square convex block. The flanging part 622 is connected to the end of the connecting part 621 facing away from the body 61. Exemplarily, the flanging part 622 can be formed by bending one end of the convex block away from the body 61 to one side. Further, the body 61, the connecting part 621, and the flanging part 622 are of an integral structure, and this structural setting is beneficial to increasing the tensile resistance of the easy-to-pull adhesive 60.

[0054] In some embodiments of the present application, please continue to refer to Figure 15 , the screen bracket 30 includes a bottom plate 34 and side plates 35. The side plates 35 are located at the edges of the bottom plate 34 and extend toward the side of the bottom plate 34 facing the display screen 20, and are used to limit the display screen 20; a notch 351 is provided on the side plates 35, the connecting portion 621 extends to the outside of the notch 351, and the flanging portion 622 abuts against the side edge 341 of the bottom plate 34. In this embodiment, by providing the side plates 35 on the bottom plate 34, the side plates 35 limit the display screen 20, which is beneficial to improving the stability of the display screen 20 on the screen bracket 30, and the side plates 35 can also prevent the display screen 20 inside from being damaged by collision. In addition, in this embodiment, a notch 351 is provided on the side plates 35, the connecting portion 621 extends to the outside of the notch 351, and the flanging portion 622 abuts against the side edge 341 of the bottom plate 34, thereby further improving the convenience for the operator to pull the easy-to-tear glue 60 through the pulling portion 62, and making the structure of the optical engine module 100 more compact.

[0055] Specifically, the side plates 35 and the bottom plate 34 are substantially perpendicular to each other, and the orthographic projection of the display screen 20 is adapted to the outer contour of the orthographic projection of the side plates 35. The width of the notch 351 is adapted to the width of the connecting portion 621.

[0056] In some embodiments of the present application, a first through hole 31 is provided on the screen bracket 30, and a second through hole 611 is provided at a position corresponding to the first through hole 31 on the inner side of the body 61. The first through hole 31 is located inside the second through hole 611. Specifically, both the first through hole 31 and the second through hole 611 are circular holes, the orthographic projections of the first through hole 31 and the second through hole 611 are arranged in concentric rings, and the difference between the diameter of the second through hole 611 and the diameter of the first through hole 31 is greater than or equal to 0 and less than or equal to 0.15 mm. In this embodiment, by locating the first through hole 31 inside the second through hole 611, it is possible to prevent the easy-to-tear glue 60 from blocking the display area of the display screen 20 on the other side of the screen bracket 30.

[0057] Furthermore, a plurality of avoidance holes 612 are provided on the periphery of the easy-to-tear glue 60, and each avoidance hole 612 is arranged in one-to-one correspondence with a corresponding threaded hole on the screen bracket 30.

[0058] Please refer to Figure 1 and Figure 9 , the optical engine module 100 further includes a lens barrel 10 and a filter screen 50. An air hole 16 extending in a curve is provided on the side wall of the lens barrel 10, and the air hole 16 communicates the external space with the accommodation cavity 12; the filter screen 50 is arranged on the side wall and is used to filter the dust flowing into the air hole.

[0059] Specifically, the lens barrel 10 includes a first port 11 and a second port 15 which are oppositely arranged. An accommodation cavity 12 communicating the first port 11 and the second port 15 is provided inside the lens barrel 10. The lens barrel 10 is generally in a circular tubular shape, and the inside of the lens barrel 10 is hollow. Along the axial direction of the lens barrel 10 (i.e., the extending direction of the lens barrel 10), the lens barrel 10 has a first port 11 and a second port 15 which are oppositely arranged, and the accommodation cavity 12 is formed inside the lens barrel 10. Among them, the screen bracket 30 is hermetically connected to the first port 11 (specifically described below); the lens 40 is arranged inside the accommodation cavity 12 and seals the second port 15. It can be understood that in this application, the screen bracket 30 is hermetically connected to the first port 11, which can prevent dust in the external space (i.e., the environmental space where the optical engine module is located) from entering the inside of the optical engine module through the gap between the first port 11 and the screen bracket.

[0060] In this application, an air hole 16 extending in a curve is provided on the side wall of the lens barrel 10, that is, the axial section of the air hole 16 (i.e., the section passing through and parallel to the axial direction) is in a curve or a broken line. Exemplarily, the axial section of the air hole 16 is in the shape of the letter "C", or the axial section of the air hole 16 is in the shape of the letter "L", or the axial section of the air hole 16 is in the shape of the letter "W", or the axial section of the air hole 16 is in the shape of the Chinese character "Ji", etc., which is not limited herein.

[0061] It should be noted that in the related art, in order to prevent dust, the first port 11 and the second port 15 of the lens barrel 10 need to be sealed (i.e., the accommodation cavity 12 inside the lens barrel 10 is a closed structure). In order to improve the stability of the product, the optical engine module 100 needs to be subjected to high and low temperature reliability tests before leaving the factory. Since the accommodation cavity 12 inside the lens barrel 10 is a closed structure, there is a pressure difference between the inside and outside of the lens barrel 10 when the optical engine module 100 is subjected to high and low temperature reliability tests, resulting in deformation of the lens barrel 10 and failing to meet the optical performance requirements.

[0062] It can be understood that in this embodiment, since the accommodation cavity 12 inside the lens barrel 10 is communicated with the external space through the air hole 16, the pressure in the accommodation cavity 12 is always equal to the pressure in the external space, so that the pressure in the accommodation cavity 12 of the optical engine module 100 in this application is always the same as the pressure in the external space when performing high and low temperature reliability tests. At the same time, since a filter screen 50 for filtering dust flowing into the air hole 16 is provided on the side wall of the lens barrel 10, dust in the external space can be prevented from entering the inside of the lens barrel 10 through the air hole 16. In addition, since the air hole 16 extends in a curve, the resistance of dust entering the inside of the lens barrel 10 through the air hole 16 is increased, further improving the dust prevention effect of the optical engine module.

[0063] It should be noted that the size and number of the air holes 16 are not limited in the present application. For example, a plurality of air holes 16 may be provided on the side wall of the lens barrel 10 , and the plurality of air holes 16 are arranged in an array.

[0064] Specifically, see Figure 13 The air hole 16 includes a first conductive section 161 and a second conductive section 162 which are connected to each other. The first conductive section 161 extends along the radial direction of the lens barrel 10 and is connected to the accommodating cavity 12. The second conductive section 162 is arranged at one end of the first conductive section 161 away from the accommodating cavity 12. The second conductive section 162 is connected to the first conductive section 161 and the external space, and the second conductive section 162 extends along the outer circumference of the lens barrel 10. This structural arrangement can prevent the lens barrel 10 of the optical machine module 100 from being deformed when performing high and low temperature reliability tests while achieving a high dustproof effect, and is conducive to reducing the manufacturing cost of the lens barrel 10.

[0065] In some embodiments of this application, please refer to Figure 9 , Figure 13 and Figure 14 , the filter 50 includes a baffle 51 and a grille 52 connected to each other, the baffle 51 is arranged opposite to one end of the first conductive section 161 close to the second conductive section 162; the grille 52 is arranged staggered with one end of the first conductive section 161 close to the second conductive section 162, and the airflow can enter and exit the interior of the air hole 16 through the grille 52. In this embodiment, the baffle 51 is arranged opposite to one end of the first conductive section 161 close to the second conductive section 162, and the grille 52 is arranged staggered with one end of the first conductive section 161 close to the second conductive section 162, so that the airflow channel enclosed by the filter 50 and the air hole 16 is longer and has more bending parts, further improving the dustproof effect of the optical machine module.

[0066] Specifically, the baffle 51 is circular, and no airflow holes are provided on the baffle 51. The orthographic projection of one end of the first conductive section 161 close to the second conductive section 162 is substantially located at the center of the baffle 51, and the diameter of the baffle 51 is 2 to 5 times the diameter of the first conductive section 161. The grille 52 is arranged around the periphery of the baffle 51. When the optical-mechanical module 100 is subjected to high and low temperature reliability testing, the gas in the external space can flow through the grille 52 into one end of the second conductive section 162 away from the first conductive section 161, and then flow along the second conductive section 162 into the first conductive section 161 and enter the accommodating cavity 12.

[0067] In some embodiments of the present application, a positioning groove 17 is further provided on the outer peripheral surface of the lens barrel 10. The second conduction section 162 is located at the bottom surface of the positioning groove 17, and the second conduction section 162 communicates with the positioning groove 17. The filter screen 50 is embedded in the positioning groove 17. In this embodiment, by further providing the positioning groove 17 on the outer peripheral surface of the lens barrel 10 and embedding the filter screen 50 in the positioning groove 17, it is beneficial to improve the structural compactness of the optical engine module 100.

[0068] In some implementations of the present application, a first through hole 31 is provided on the screen support 30, and an installation groove 32 is provided on a side thereof facing away from the display screen 20. The installation groove 32 is disposed around the periphery of the first through hole 31, and the first port 11 of the lens barrel 10 is hermetically connected to the installation groove 32.

[0069] Specifically, the installation groove 32 has a first stepped surface 321; please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 , the first port 11 of the lens barrel 10 is provided with a second stepped surface 111 that cooperates with the first stepped surface 321, and the first stepped surface 321 and the second stepped surface 111 are hermetically connected.

[0070] Exemplarily, the screen support 30 is a rubber elastic support, such as a screen support 30 made of silica gel material. The first through hole 31 is a circular hole, the installation groove 32 is an annular groove, and the first through hole 31 is located within the installation groove 32. Of course, in some other embodiments of the present application, the first through hole 31 may also be oval, or square, or polygonal, etc., which are not limited herein.

[0071] It can be understood that in the prior art, the lens barrel 10 and the screen support 30 are generally locked and fixed by threaded members, and the first port 11 of the lens barrel 10 abuts against a surface of the screen support 30 facing away from the display screen 20, so that the first port 11 of the lens barrel 10 is sealed with a surface of the screen support 30 facing away from the display screen 20. However, due to the influence of the machining accuracy of the surface of the first port 11 and the screen support 30 facing away from the display screen 20, there is a problem of poor sealing at the connection between the first port 11 and the screen support 30 facing away from the display screen 20, resulting in dust easily entering the interior of the lens barrel 10 through the gap between the first port 11 of the lens barrel 10 and the screen support 30.

[0072] In view of the above technical problems in the prior art, in the present application, an installation groove 32 is provided on a side of the screen support 30 facing away from the display screen 20. The installation groove 32 is arranged along the periphery of the first through hole 31, and the installation groove 32 has a first stepped surface 321; the lens barrel 10 has a first port 11 installed in the installation groove 32, and the first port 11 is provided with a second stepped surface 111 that cooperates with the first stepped surface 321. The first stepped surface 321 and the second stepped surface 111 are hermetically connected, so that the connection between the lens barrel 10 and the screen support 30 in the present application is a stepped surface mating seal, improving the sealing performance at the connection between the lens barrel 10 and the screen support 30.

[0073] In some embodiments of the present application, please refer again to Figure 2 and Figure 3 a glue overflow groove 32a is provided between the screen support 30 and the lens barrel 10. The glue overflow groove 32a is used to accommodate the glue overflowing from the first stepped surface 321 and / or the second stepped surface 111.

[0074] It can be understood that when assembling the screen support 30 and the lens barrel 10, in order to further increase the stability and sealing effect at the connection between the screen support 30 and the lens barrel 10, glue (such as silicone) is generally applied on the first stepped surface 321 and / or the second stepped surface 111. However, the glue has a certain fluidity before curing and is likely to flow into the interior of the optical engine module 100 (such as the inside of the lens barrel 10). In this embodiment, by providing the glue overflow groove 32a between the screen support 30 and the lens barrel 10, the glue overflow groove 32a is used to accommodate the glue overflowing from the first stepped surface 321 and / or the second stepped surface 111, thus effectively preventing the overflowing glue from flowing into the interior of the optical engine module 100. Exemplarily, the glue overflow groove 32a is annular, and the part of the installation groove 32 not filled by the first port 11 forms the glue overflow groove 32a. For details, please refer to the following text.

[0075] In some embodiments of the present application, the installation groove 32 includes a bottom surface 322, an inner side surface (i.e., the first stepped surface), and an outer side surface 323. The bottom surface 322, the inner side surface, and the outer side surface 323 are all annular. The inner side surface and the outer side surface 323 are oppositely arranged. The bottom surface 322 is located between the inner side surface and the outer side surface 323 and connects the inner side surface and the outer side surface 323; the inner side surface forms the first stepped surface 321; an overflow groove 32a is formed between the outer side surface 323 and the lens barrel 10. In this example, the first stepped surface 321 is formed by the inner side surface of the installation groove 32, and the glue overflow groove 32a is formed between the outer side surface 323 of the installation groove 32 and the lens barrel 10, which is beneficial to improving the structural compactness of the optical engine module 100 and further preventing the overflowing glue from flowing into the interior of the optical engine module 100.

[0076] Specifically, the first stepped surface 321 includes a first step surface 3211, a first connecting surface 3212, and a second step surface 3213 that are sequentially connected. The second step surface 3213 and the first step surface 3211 are oppositely arranged, and the second step surface 3213 is located inside the first step surface 3211 (i.e., on the side closer to the center line of the lens barrel 10); the first connecting surface 3212 connects the first step surface 3211 and the second step surface 3213; please refer to again Figure 6 and Figure 7 , the second stepped surface 111 includes a first end surface 1111, a second end surface 1112, and a second connecting surface 1113.

[0077] Exemplarily, the bottom surface 322, the first step surface 3211, and the second step surface 3213 are all annular, and the bottom surface 322, the first step surface 3211, and the second step surface 3213 are substantially parallel to each other. The bottom surface 322, the first step surface 3211, and the second step surface 3213 are sequentially arranged in the direction from the screen bracket to the lens barrel 10. The outer side surface 323 and the first connecting surface 3212 are substantially cylindrical, and the bottom surface 322 and the outer side surface 323 are substantially perpendicular to each other. In the radial direction of the lens barrel 10 (from the outside to the inside), the outer side surface 323, the bottom surface 322, the first step surface 3211, the first connecting surface 3212, and the second step surface 3213 are sequentially connected. Among them, the first end surface 1111 is hermetically connected to the first step surface 3211; and / or, the second end surface 1112 is hermetically connected to the second step surface 3213; and / or, the second connecting surface 1113 is hermetically connected to the first connecting surface 3212. That is, in this embodiment, the hermetic connection between the first stepped surface 321 and the second stepped surface 111 can be that a sub-surface in the first stepped surface 321 is hermetically connected to a corresponding sub-surface in the second stepped surface 111. Exemplarily, the first step surface 3211 of the first stepped surface 321 is hermetically connected to the first end surface 1111 of the second stepped surface 111. It can be understood that since both the first step surface 3211 and the first end surface 1111 are annular, only the hermetic connection between the first step surface 3211 and the first end surface 1111 can make the first stepped surface 321 and the second stepped surface 111 hermetically connected. Similarly, in some other embodiments of the present application, it can also be that only the second step surface 3213 and the second end surface 1112 are hermetically connected, or the second connecting surface 1113 is hermetically connected to the first connecting surface 3212.

[0078] Of course, in this application, the sealing connection between the first stepped surface 321 and the second stepped surface 111 can also be that multiple sub - surfaces in the first stepped surface 321 are sealingly connected to multiple corresponding sub - surfaces in the second stepped surface 111. Exemplarily, the first step surface 3211 is sealingly connected to the first end surface 1111, and the second connection surface 1113 is sealingly connected to the first connection surface 3212. The second step surface 3213 and the second end surface 1112 are spaced apart (for example, there is a small assembly gap between the second step surface 3213 and the second end surface 1112), so as to avoid excessive interference during the assembly of the lens barrel 10 and the screen bracket 30.

[0079] Furthermore, the width of the second end surface 1112 is smaller than the width of the second step surface 3213, that is, along the radial direction of the lens barrel, the width of the second end surface 1112 is smaller than the width of the second step surface 3213. In this embodiment, by setting the width of the second end surface 1112 to be smaller than the width of the second step surface 3213, the structure of the optical engine module 100 is made more compact, which is beneficial to reducing the volume of the optical engine module 100.

[0080] In some embodiments of this application, the first stepped surface 321 further includes a third connection surface 3214. The first step surface 3211 is spaced apart from the bottom surface 322 and is located inside the bottom surface 322. The third connection surface 3214 connects the bottom surface 322 and the first step surface 3211. In this embodiment, by providing the third connection surface 3214 in the first stepped surface 321, and the third connection surface 3214 connecting the bottom surface 322 and the first step surface 3211, the bottom surface 322 is lower than the connection between the lens barrel 10 and the screen bracket 30, that is, the glue overflow groove 32a is lower than the connection between the lens barrel 10 and the screen bracket 30. Thus, more glue can be applied to the first stepped surface 321, which is beneficial to further improving the sealing effect between the first stepped surface 321 and the second stepped surface 111, and can prevent the overflowing glue from flowing into the interior of the optical engine module 100.

[0081] Furthermore, along the radial direction of the lens barrel, the width of the first step surface 3211 is smaller than the width of the first end surface 1111. The first end surface 1111, the third connection surface 3214, the bottom surface 322, and the outer side surface 323 enclose the glue overflow groove 32a. In this embodiment, by making the width of the first step surface 3211 smaller than the width of the first end surface 1111, and the first end surface 1111, the third connection surface 3214, the bottom surface 322, and the outer side surface 323 enclose the glue overflow groove 32a, the overflowing glue can be quickly discharged into the glue overflow groove 32a, which is beneficial to further preventing the overflowing glue from flowing into the interior of the optical engine module 100.

[0082] In this application, please refer toFigures 16 to 18 , the optical engine module 100 further includes a lens 40, and the orthographic projection of the lens 40 is annular; the orthographic projection of the lens 40 includes an arc curve 44, a first end point 451, a second end point 452, and a conic curve 45 connecting the first end point 451 and the second end point 452; the angle A between the straight line L2 connecting the first end point 451 and the second end point 452 and the horizontal line L1 is an acute angle. It should be noted that the orthographic projection of the lens refers to the projection formed by irradiating the lens with incident light in a direction perpendicular to the surface of the lens (taking Figure 16 as an example, the plane where the surface of the lens is located generally coincides with the plane where the screen is located, and the direction perpendicular to the screen can also be considered as the direction perpendicular to the surface of the lens), that is, the outer contour of the lens. A conic curve refers to the intersection line obtained by using a plane to intercept a quadratic conical surface. In this embodiment, since the periphery of the lens includes a conic curve, and the angle A between the straight line connecting the first end point and the second end point and the horizontal line is an acute angle, the conic curve can be closer to the side of the user's nose bridge, so that the lens in the present application can avoid interference with the nose bridge, and through the above structural design, the lens in the present application is a rotationally symmetric structure, so that it can be applicable to the left and right optical engine modules in VR devices at the same time, thereby improving the applicability of the lens.

[0083] In some embodiments of the present application, the angle A between the straight line L2 connecting the first end point 451 and the second end point 452 and the horizontal line L1 is between 20° and 90°, further, the angle A is between 30° and 80°, further, the angle A is between 35° and 80°, still further, the angle A is between 40° and 75°, still further, the angle A is between 45° and 70°, still further, the angle A is between 50° and 65°, still further, the angle A is between 55° and 65°. It can be understood that setting the angle between 50° and 70° can make the lens better match the contour of the user's nose. Exemplarily, the angle A between the straight line L2 connecting the first end point 451 and the second end point 452 and the horizontal line L1 is 40°, or 45°, or 50°, or 55°, or 60°, or 65°, or 70°, or 75°.

[0084] In some embodiments of the present application, the curvature of the conic curve is between 0.3 and 0.7, further, the curvature of the conic curve is between 0.4 and 0.6, still further, the curvature of the conic curve is between 0.45 and 0.55. It can be understood that setting the curvature between 0.4 and 0.6 can make the outer contour curve of the lens more plump and make the lens more beautiful. The curvature of the conic curve 45 is 0.30, or 0.35, or 0.4, or 0.45, or 0.5, or 0.55, or 0.6, or 0.65, or 0.70.

[0085] In some embodiments of the present application, the curvature at the connection between the arc curve 44 and the conic curve 45 gradually changes. Exemplarily, a fillet 46 is provided at the connection between the arc curve 44 and the conic curve 45.

[0086] In some embodiments of the present application, please refer to Figure 2 、 Figure 6 and Figure 8 ,the lens barrel 10 has a receiving cavity 12, a boss 13 is provided on the side wall of the receiving cavity 12, and the boss 13 extends towards the middle of the receiving cavity 12; a dispensing step 41 is provided on the periphery of the lens 40, and the dispensing step 41 and the side wall of the receiving cavity 12 enclose a dispensing groove 41a. In this embodiment, by providing the dispensing step 41 on the periphery of the lens 40, the dispensing step 41 and the side wall of the receiving cavity 12 enclose a dispensing groove 41a, so that it is convenient to apply glue on the dispensing step 41 to fix the lens 40 on the boss 13, and the glue can be prevented from flowing to the middle area of the lens 40.

[0087] Specifically, the lens 40 is circular, and the receiving cavity 12 is cylindrical. The boss 13 extends towards the inside of the receiving cavity 12 (i.e., towards the center line of the lens barrel 10), the boss 13 is generally annular, and the inner diameter of the boss 13 is smaller than the outer diameter of the lens 40. During assembly, the periphery of the lens 40 is carried on the boss 13. The dispensing step 41 is provided on the side of the lens 40 facing away from the boss 13, and the cross section of the dispensing step 41 is generally in the shape of the letter "L".

[0088] In some embodiments of the present application, the optical engine module 100 further includes a lens 40, please refer to Figure 12 ,a plurality of first positioning portions 42 are provided on the periphery of the lens 40; the lens barrel 10 has a receiving cavity 12, please refer to Figure 11 and Figure 10 ,a plurality of second positioning portions 14 are provided on the side wall of the receiving cavity 12, and each first positioning portion 42 cooperates with the corresponding second positioning portion 14 to limit the circumferential rotation of the lens 40. Specifically, a plurality of first positioning portions 42 are provided on the periphery of the lens 40, and the plurality of first positioning portions 42 are arranged at equal intervals along the circumference of the lens 40. Exemplarily, the first positioning portion 42 can be a positioning plane provided on the side of the lens 40, and the positioning plane is provided on the part of the periphery of the lens 40 close to the lens barrel 10, and the positioning plane can be formed by grinding or cutting the edge of the circular lens 40. Correspondingly, the second positioning portion 14 is a plane provided on the side of the lens barrel 10 and opposite to the first positioning portion 42 and having a small assembly gap. Of course, in some other embodiments of the present application, the first positioning portion may also be a groove, and the second positioning portion is a protrusion adapted to the groove. During assembly, the second positioning portion is embedded in the first positioning portion, so as to limit the relative rotation of the lens 40 with respect to the lens barrel 10.

[0089] In some embodiments of the present application, the optical engine module 100 further includes a plurality of locking members (not labeled in the figure). A plurality of first fastening holes (not labeled in the figure) are provided on the periphery of the lens barrel 10, and a plurality of second fastening holes 33 are provided on the screen bracket 30. The first fastening holes and the second fastening holes 33 are arranged in one-to-one correspondence, and the locking members pass through the corresponding first fastening holes and the second fastening holes 33 to fixedly connect the lens barrel 10 and the screen bracket 30. Specifically, the locking members are screw fasteners, and both the first fastening holes and the second locking holes are threaded holes. Exemplarily, four first threaded holes are evenly arranged in the circumferential direction of the lens barrel 10, and four second threaded holes are provided on the screen bracket 30. Each screw passes through one threaded hole and one second threaded hole to fixedly connect the lens barrel 10 and the screen bracket 30.

[0090] In some embodiments of the present application, a polarization reflection film 43 is further provided on the side of the lens 40 facing away from the screen bracket. Specifically, the polarization reflection film 43 is fixed on the side of the lens 40 facing away from the display screen. The polarization reflection film 43 is used to improve the optical performance of the optical engine module, making the image seen by the human eye clearer. The specific structure of the polarization reflection film 43 does not belong to the main improvement points of the present application and is not limited herein.

[0091] In some embodiments of the present application, the lens barrel 10 further includes a front cover 70, and the front cover 70 is detachably arranged at the second port 15. Specifically, the front cover 70 is snap-connected to the outer wall of the second port 15.

[0092] The embodiments of the present application further provide a method for preparing a lens. The preparation method includes:

[0093] S1 Provide an initial lens. Please refer to Figure 18 , the periphery of the initial lens is circular, and its periphery has a first end point 451 and a second end point 452 arranged at intervals. The first end point 451 and the second end point 452 divide the periphery of the initial lens into an arc curve 44 and a sacrifice curve 48, and the length of the arc curve 44 is greater than the length of the sacrifice curve 48.

[0094] Specifically, the periphery of the initial lens is circular, and the radius of the initial lens is R. The horizontal line passing through the center point of the initial lens is L1, and the distance from the first end point 451 to the horizontal line L1 is H. Exemplarily, H is between 0.1R and 0.5R. The straight line passing through the first end point 451 and perpendicular to the horizontal line L1 is L2, and the other intersection point of L2 and the circumference is the second end point 452, that is, the straight line L2 is the straight line connecting the first end point 451 and the second end point 452. It can be understood that the first end point 451 and the second end point 452 on the circumference will inevitably divide the periphery of the initial lens into two arc curves with different lengths in the circumferential direction, and one of the shorter arc curves is the sacrifice curve 48.

[0095] S2 cuts the sacrificial region 47 enclosed by the conic curve 45 connecting the first endpoint 451 and the second endpoint 452 and the sacrificial curve 48 to obtain the lens 40; wherein, the conic curve 45 is arranged on the side close to the user's nose bridge, and the angle A between the straight line L2 connecting the first endpoint 451 and the second endpoint 452 and the horizontal line L1 is between 30° and 90°, and the curvature of the conic curve is between 0.3 and 0.7. Exemplarily, a laser cutting process can be used to cut the sacrificial region.

[0096] In some embodiments of the present application, after step S2, the preparation method further includes polishing the connection between the conic curve and the arc curve to form a fillet 46 at the connection.

[0097] An embodiment of the present application further provides a VR device, which includes the above optical engine module 100.

[0098] The above has introduced in detail the optical engine module and the VR device provided by the embodiments of the present invention. In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A lens, characterized in that, The orthographic projection of the lens is annular, and includes an arc curve, a first endpoint, a second endpoint, and a conic curve connecting the first endpoint and the second endpoint; the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is an acute angle.

2. The lens according to claim 1, characterized in that, The curvature of the connection between the arc curve and the conic curve changes slightly gradually.

3. The lens according to claim 1, characterized in that, The angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 20° and 90°; Preferably, the angle between the straight line connecting the first endpoint and the second endpoint and the horizontal line is between 30° and 60°; and / or, the angle between a straight line connecting the first endpoint and the second endpoint and a horizontal line is between 35° and 80°; and / or, the angle between a straight line connecting the first endpoint and the second endpoint and a horizontal line is between 45° and 70°; And / or, the angle between a straight line connecting the first endpoint and the second endpoint and a horizontal line is between 55° and 65°.

4. The lens according to claim 1, wherein, The curvature of the conic section is between 0.3 and 0.7; Preferably, the curvature of the conic section is between 0.4 and 0.6; Preferably, the curvature of the conic section is between 0.45 and 0.

55.

5. An optical-mechanical module for a VR device, characterized in that, The invention comprises a lens barrel and the lens according to any one of claims 1 to 4, wherein the lens is arranged in the lens barrel.

6. The optical-mechanical module according to claim 5, wherein The optical machine module also includes a screen module, the lens barrel includes a first port and a second port arranged opposite to each other, a receiving cavity connecting the first port and the second port is provided in the lens barrel, the lens is located in the receiving cavity and seals the second port, and the screen module is sealed and connected to the first port.

7. The optical machine module according to claim 6, characterized in that, The screen module includes a screen bracket and a display screen, the screen bracket is provided with a through hole, and a mounting groove is provided on a side thereof away from the display screen, the mounting groove is arranged along the outer edge of the through hole, and the mounting groove has a first stepped surface; The first port is provided with a second step surface that cooperates with the first step surface, and the first step surface and the second step surface are sealed and connected.

8. The optical-mechanical module according to claim 6, wherein A boss is provided on the side wall of the accommodating cavity, and the boss extends toward the middle of the accommodating cavity; a glue-dispensing step is provided on the periphery of the lens, and the glue-dispensing step and the side wall of the accommodating cavity are combined to form a glue-dispensing groove.

9. The optical-mechanical module according to claim 6, wherein The optical machine module further includes a filter screen. An air hole extending in a curve is provided on the side wall of the lens barrel. The air hole connects the external space with the accommodating cavity. The filter screen is arranged on the side wall.

10. The optical machine module according to claim 5, characterized in that, The optical machine module also includes a screen bracket, a display screen and an easy-to-pull adhesive tape; the easy-to-pull adhesive tape is arranged on the screen bracket; the easy-to-pull adhesive tape includes a main body and a handle portion that are interconnected, the handle portion is exposed to the outside of the display screen, and the handle portion is in the shape of the letter "L".

Images