Optical modules and VR devices

Abstract

The present invention relates to the technical field of display devices. 【Solution means】Provided are an optical module and a VR device including a holder assembly, a focus adjustment assembly, a screen assembly, and a lens assembly. The holder assembly includes a limit platen and a screen holder. A guide groove is provided along the circumferential direction on the inner wall of the screen holder. The focus adjustment assembly includes a lens barrel and a focus adjustment member movably provided on the lens barrel. The focus adjustment member is limited to the surface of the screen holder via the limit platen. A spiral guide boss is provided on the inner wall of the focus adjustment member. Along the circumferential direction on the outer wall of the lens barrel, there are provided a boss engaging with the guide groove and a shoot formed on the boss and engaging with the spiral guide boss. Through the spiral guide boss, the lens barrel rotates axially along the shoot so as to move in the optical axis direction along the guide groove of the screen holder, thereby changing the distance between the screen assembly and the lens barrel. To prevent the rotating focus adjustment member from moving in the optical axis direction, the limit platen and the focus adjustment member form a limit at the assembly location, realizing simple focus adjustment and wide-range focus adjustment.

Description

[Technical Field]

[0001] The present invention relates to the technical field of display devices, and in particular to optical modules and VR devices. [Background technology]

[0002] In recent years, head-mounted virtual reality (VR) products have been widely adopted by consumers, and the 3D virtual world embedded in the computer system gives users a sense of presence and allows them to observe things in 3D space instantly and without limit.The same optical system can hardly meet the needs of different people without adjustments based on the consumer's eyesight and usage habits, so VR products must have the function of adjusting the focal length to suit the consumer's needs.

[0003] Currently, some conventional VR optical module structures have inconvenient and narrow adjustment range for the focus adjustment of their internal lenses, and many do not have focus adjustment function, which results in small change in the viewing angle of the VR optical module, poor visual experience, and affects the display effect and usage experience of VR devices. Therefore, how to achieve the requirements of easy focus adjustment, wide focus adjustment range, and easy manufacturing and molding of the structure for the VR optical module is currently a problem to be solved.

[0004] Therefore, there is a need to provide a new optical module and VR device. Summary of the Invention [Problem to be solved by the invention]

[0005] The objective of the present invention is to provide an optical module and a VR device that solve the technical problem of the conventional VR optical module, which has a small change in the viewing angle and a poor visual experience effect. [Means for solving the problem]

[0006] The technical solutions of the present invention are as follows: One aspect of the present invention provides an optical module for a VR device, the optical module comprising: a holder assembly; a focus adjustment assembly rotatably mounted on the holder assembly; a screen assembly fixedly mounted on the holder assembly; and a lens assembly mounted within the focus adjustment assembly; The holder assembly further includes a limit platen and a screen holder, and a guide groove is provided on an inner wall of the screen holder along a circumferential direction. the focus adjustment assembly further includes a lens barrel in which the lens assembly is mounted, and a focus adjustment member movably provided on the lens barrel, the focus adjustment member being limited to the surface of the screen holder via the limit platen, a spiral guide boss being provided on the inner wall of the focus adjustment member, and a boss engaging with the guide groove, and a chute formed on the boss and engaging with the spiral guide boss being provided on the outer wall of the lens barrel along the circumferential direction, The focus adjustment member rotates axially along the chute on the lens barrel via the spiral guide boss, causing the lens barrel to move in the optical axis direction along the guide groove of the screen holder, thereby changing the distance between the screen assembly and the lens barrel, and the limit platen and the focus adjustment member form a limit at the assembly point to prevent the rotating focus adjustment member from moving in the optical axis direction.

[0007] According to one embodiment of the present invention, the guide groove of the screen holder and the boss on the outer wall of the lens barrel are fitted together with a clearance so that a gap is formed between the inner wall of the screen holder and the outer wall of the lens barrel.

[0008] According to one embodiment of the present invention, a first protrusion and a second protrusion having a height lower than that of the first protrusion are formed along the circumferential direction on the end surface where the focus adjustment member and the limit platen are assembled, and a limit step is provided on the inner wall of the limit platen, and when the limit platen and the focus adjustment member are assembled, the first protrusion is engaged with the limit step to prevent the rotating focus adjustment member from moving in the optical axis direction.

[0009] According to one embodiment of the present invention, the focusing assembly further comprises a barrel cover, the barrel cover being provided with a snap fit, and the outer wall of the barrel being further provided with a snap groove that engages with the snap fit.

[0010] According to one embodiment of the present invention, the lens assembly further includes a first lens, a second lens, and a third lens arranged in sequence from close to the lens barrel cover to away from the lens barrel, and the first lens, the second lens, and the third lens are each fixedly connected to the lens barrel.

[0011] According to one embodiment of the present invention, the screen assembly further comprises a screen fixed to the screen holder and a base cover provided on the side of the screen facing away from the screen holder, the base cover being fixedly connected to the screen holder.

[0012] According to an embodiment of the present invention, the screen assembly further includes an attachment member, and the screen is fixed to the screen holder via the attachment member.

[0013] According to one embodiment of the present invention, the screen assembly further comprises a heat-conducting member, the heat-conducting member being provided on a side of the screen closer to the base cover.

[0014] According to an embodiment of the present invention, the holder assembly further includes a seal member provided between the limit platen and the screen holder.

[0015] Another aspect of the present invention provides a VR device including the optical module described above. [Effects of the Invention]

[0016] The beneficial effects of the present invention are: The spiral guide boss of the focus adjustment member rotates axially along the chute on the lens barrel, causing the lens barrel to move in the optical axis direction along the guide groove of the screen holder, thereby changing the distance between the screen assembly and the lens barrel. To prevent the rotating focus adjustment member from moving in the optical axis direction, the limit platen and the focus adjustment member form a limit at the assembly point, achieving simple focus adjustment and a wide range of focus adjustment. This effectively solves the disadvantages of traditional VR optical modules, such as small change in field of view and poor visual experience, and overcomes the difficulties in manufacturing and forming the structure, improves processing efficiency, and reduces costs. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram of a three-dimensional structure of an optical module according to an embodiment of the present invention; [Figure 2] 2 is a schematic diagram of the exploded structure of the focusing assembly and lens assembly of the optical module of FIG. 1; [Figure 3] 2 is a schematic diagram of an explosion structure of a holder assembly and a screen assembly of the optical module of FIG. 1; [Figure 4] 1 is a schematic diagram of a three-dimensional structure of a screen holder according to an embodiment of the present invention. [Figure 5] 1 is a schematic diagram of a three-dimensional structure of a lens barrel according to an embodiment of the present invention. [Figure 6] 2 is a schematic diagram of a three-dimensional structure of a focus adjustment member according to an embodiment of the present invention. FIG. [Figure 7] FIG. 2 is a schematic diagram of a three-dimensional structure of a limit platen according to an embodiment of the present invention. [Figure 8] 1 is a schematic diagram of a three-dimensional structure of a lens barrel cover according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] As shown in Figures 1 to 3, the present invention provides an optical module 100 comprising a holder assembly 10, a focus adjustment assembly 20 rotatably mounted on the holder assembly 10, a screen assembly 30 fixedly mounted on the holder assembly 10, and a lens assembly 40 mounted within the focus adjustment assembly 20.

[0020] 3, the holder assembly 10 further includes a limit platen 11, a screen holder 13 used to mount the screen assembly 30, and a seal member 12 provided between the limit platen 11 and the screen holder 13, with the limit platen 11 fixedly connected to the screen holder 13 by screws. The seal member 12 is attached to the screen holder 13 and serves the functions of preventing dust and changing frictional force, and a seal ring is preferred. Furthermore, referring to FIG. 4, a guide groove f is provided in the inner wall of the screen holder 13 along the circumferential direction. The number of guide grooves f may be three, and the multiple guide grooves f are all distributed along the circumferential direction on the inner wall of the screen holder 13.

[0021] Referring further to FIG. 2, the focus adjustment assembly 20 further includes a lens barrel 21 in which the lens assembly 40 is mounted and a focus adjustment member 22 movably mounted on the lens barrel 21. The focus adjustment member 22 is limited to the surface of the screen holder 13 via the limit platen 11, and the focus adjustment member 22 achieves focus adjustment by changing the distance between the lens barrel 21 and the screen. Referring further to FIG. 6, a spiral guide boss e is provided on the inner wall of the focus adjustment member 22, preferably three spiral guide bosses e. The outer wall of the focus adjustment member 22 is provided with etching marks p, which have an anti-slip effect and prevent the focus adjustment member 22 from slipping during rotation. Referring further to FIG. 5, a boss d that engages with the guide groove f and a chute c formed in the boss d and engaging with the spiral guide boss e are provided along the circumferential direction on the outer wall of the lens barrel 21.

[0022] In the optical module 100, the spiral guide boss e of the focus adjustment member 22 rotates axially along the chute c of the lens barrel 21, causing the lens barrel 21 to move along the guide groove f of the screen holder 13 in the optical axis direction, thereby changing the distance between the screen assembly 30 and the lens barrel 21. The limit platen 11 and the focus adjustment member 22 form a limit at the assembly location to prevent the rotating focus adjustment member 22 from moving in the optical axis direction, thereby achieving the purpose of focus adjustment. This allows for easy focus adjustment and a wide range of focus adjustment characteristics, and further allows the user's eyes to obtain more information and a richer visual experience. The focus adjustment member 22 of the present invention can rotate at a range of 0-70°, and the movement distance between the lens barrel 21 and the screen can be achieved in a range of 0-3.5 mm. Compared to conventional 3P-type pancake focus adjustment VR optical modules, the present invention has the advantages of being lighter and smaller, further enhancing the user experience.

[0023] In one feasible embodiment, the guide groove f of the screen holder 13 and the boss d on the outer wall of the lens barrel 21 are fitted together with a clearance, thereby creating a gap between the inner wall of the screen holder 13 and the outer wall of the lens barrel 21. Preferably, the one-sided gap between the lens barrel 21 and the inner wall of the screen holder 13 is designed to be 0.1 mm, thereby preventing friction between the lens barrel 21 and the inner wall of the screen holder 13 and improving product yield.

[0024] In one feasible embodiment, referring to FIG. 6, a first protrusion h and a second protrusion k shorter in height than the first protrusion h are formed in a circumferential direction on the end surface where the focus adjustment member 22 and the limit platen 11 are assembled, and referring to FIG. 7, a limit step g is provided on the inner wall of the limit platen 11, and when the limit platen 11 and the focus adjustment member 22 are assembled, the first protrusion h is engaged with the limit step g to prevent the rotating focus adjustment member 22 from moving in the optical axis direction.

[0025] 2 and 8 , in one possible embodiment, the focusing assembly 20 further includes a barrel cover 23 for protecting the lens assembly 40 mounted in the barrel 21. The barrel cover 23 is provided with a snap fit a, and the outer wall of the barrel 21 is further provided with a snap groove b that engages with the snap fit a. The number of snap fits a may be one or more, and the snap groove b is provided in one-to-one correspondence with the snap fit a. Preferably, the number of snap fits a is one or two, allowing for easy removal. The barrel cover 23 can protect the lens assembly 40 in the barrel 21 from environmental contamination when not in use, thereby extending the service life of the optical module 100 and improving the user experience.

[0026] 1 and 2, in one possible embodiment, lens assembly 40 further includes first lens 42, second lens 43, and third lens 44 arranged in this order from close to barrel cover 23 to away from barrel 21, and first lens 42, second lens 43, and third lens 44 are each fixedly connected to barrel 21. When mounting, composite film 41 is attached to first lens 42, lens double-sided tape 45 is attached to the corresponding position on barrel 21, third lens 44 is fixed to barrel 21 via lens double-sided tape 45 and pressure is maintained, further, second lens 43 is mounted on barrel 21 and adhesively fixed to barrel 21 via UV tape, and further, first lens 42 with composite film 41 attached is mounted on barrel 21 and adhesively fixed to barrel 21 via UV tape.

[0027] 1 to 3, in one possible embodiment, the screen assembly 30 further includes an attachment member 31 fixed to the screen holder 13, a screen 32 fixed to the screen holder 13 via the attachment member 31, a heat-conducting member 33 provided on the side of the screen 32 away from the screen holder 13, and a base cover 34, the base cover 34 being fixedly connected to the screen holder 13. The attachment member 31 is a viscous material and may be a double-sided screen tape, and the heat-conducting member 33 is a thermally conductive material and may be a thermally conductive silicone pad, which is provided at the rear end of the screen 32 to help the screen 32 dissipate heat.

[0028] 1 to 3, the optical module 100 of this embodiment is mounted in the following manner: a composite film 41 is attached to a first lens 42, and then a double-sided lens tape 45 is attached to the corresponding position of the lens barrel 21; a third lens 44 is fixed to the lens barrel 21 via the double-sided lens tape 45 and pressure-retained; a second lens 43 is attached to the lens barrel 21 and adhesively fixed to the lens barrel 21 via UV tape; the first lens 42 with the composite film 41 attached is attached to the lens barrel 21 and adhesively fixed to the lens barrel 21 via UV tape; a screw guide boss e of the focus adjustment member 22 is loosely fitted into a chute c of the lens barrel 21 in a one-to-one correspondence; a seal member 12 is attached to a screen holder 13; and grease is applied to the surface of the seal member 12 to reduce the friction between the focus adjustment member 22 and the seal member 12; Furthermore, bosses d of lens barrel 21 are attached to guide grooves f of screen holder 13 in a one-to-one correspondence, focus adjustment member 22 is limited by limit platen 11, a first protrusion h of focus adjustment member 22 is engaged with limit step g of limit platen 11, limit platen 11 is fixed to screen holder 13 with screws, lens barrel cover 23 is attached to the tip of lens barrel 21 and is limited in a one-to-one correspondence with snap grooves b of lens barrel 21 via snap fits a of lens barrel cover 23, attachment member 31 is attached to the inner surface of screen holder 13, screen 32 is adhesively fixed inside screen holder 13 via attachment member 31, a heat conduction member 33 is attached to the rear end of screen 32 to increase heat dissipation, and base cover 34 and screen holder 13 are fixed with screws.

[0029] An embodiment of the present invention further provides a VR device including the above optical module 100. The specific structure of the optical module 100 can be referred to the above embodiments, and since the present VR device adopts all the technical solutions of all the above embodiments, it can at least achieve all the beneficial effects brought by the technical solutions of the above embodiments, so it will not be mentioned in detail here.

[0030] The above is merely an embodiment of the present invention, and as should be pointed out here, those skilled in the art may make improvements without departing from the creative concept of the present application, all of which fall within the scope of protection of the present application.

Claims

1. An optical module applied to a VR device, the optical module comprising: a holder assembly; a focus adjustment assembly rotatably mounted on the holder assembly; a screen assembly fixedly mounted on the holder assembly; and a lens assembly mounted within the focus adjustment assembly; The holder assembly further includes a limit platen and a screen holder, and a guide groove is provided on an inner wall of the screen holder along a circumferential direction. the focus adjustment assembly further comprises a lens barrel in which the lens assembly is mounted, and a focus adjustment member movably mounted on the lens barrel, the focus adjustment member being mounted so as to be limited to the surface of the screen holder via the limit platen, a spiral guide boss being provided on the inner wall of the focus adjustment member, and a plurality of bosses being spaced apart in the circumferential direction on the outer wall of the lens barrel which engage with the guide grooves, and a chute being formed on each boss and engaging with the spiral guide boss, the spiral guide boss of the focus adjustment member rotates in the circumferential direction along the chute of the lens barrel, causing the lens barrel to move in the optical axis direction along the guide groove of the screen holder, thereby changing the distance between the screen assembly and the lens barrel, and forming a limit at the assembly location of the limit platen and the focus adjustment member to prevent the rotating focus adjustment member from moving in the optical axis direction; The boss is composed of two sub-bosses extending on the same straight line along the axial direction, The chute is a groove located between the two sub-bosses. An optical module characterized by:

2. the guide groove of the screen holder and the boss on the outer wall of the lens barrel are fitted together with a clearance so that a gap is formed between the inner wall of the screen holder and the outer wall of the lens barrel.

2. The optical module according to claim 1.

3. a first protrusion and a second protrusion having a height lower than that of the first protrusion are formed along a circumferential direction on an end surface where the focus adjustment member and the limit platen are assembled, a limit step is provided on an inner wall of the limit platen, and the first protrusion is engaged with the limit step so that the rotating focus adjustment member does not move in the optical axis direction when the limit platen and the focus adjustment member are assembled; 2. The optical module according to claim 1.

4. the focusing assembly further includes a lens barrel cover, the lens barrel cover being provided with a snap fit, and the outer wall of the lens barrel being further provided with a snap groove that engages with the snap fit; 2. The optical module according to claim 1.

5. the lens assembly further includes a first lens, a second lens, and a third lens arranged in this order from close to the barrel cover to away from the barrel, the first lens, the second lens, and the third lens being fixedly connected to the barrel, respectively.

5. The optical module according to claim 4.

6. The screen assembly further includes a screen fixed to the screen holder and a base cover provided on a side of the screen away from the screen holder, the base cover being fixedly connected to the screen holder.

2. The optical module according to claim 1.

7. The screen assembly further includes an attachment member, and the screen is fixed to the screen holder via the attachment member.

7. The optical module according to claim 6.

8. The screen assembly further includes a heat-conducting member, the heat-conducting member being provided on a side of the screen closer to the base cover.

8. The optical module according to claim 7.

9. The holder assembly further includes a seal member provided between the limit platen and the screen holder.

2. The optical module according to claim 1.

10. An optical module according to any one of claims 1 to 9, A VR device characterized by the above.

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