Optical Module and VR Device

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 particularly to optical modules and VR devices.

Background Art

[0002] In recent years, head-mounted virtual reality (VR) products have been widely loved by consumers. The three-dimensional virtual world embedded through a computer system allows users to feel a sense of presence and observe things in the three-dimensional space immediately and without limitation. In the case of the same optical system, since it can hardly meet the needs of different people without adjustment according to the eyesight and usage habits of consumers, VR products must have a function of adjusting the focal length according to the needs of consumers.

[0003] Currently, some conventional VR optical module structures have inconvenient focal length adjustment of their internal lenses and a narrow adjustment range, and most of them do not have a focal length adjustment function. Therefore, the change in the viewing angle of the VR optical module becomes small, the visual experience effect is not good, and it affects the display effect and usage experience of the VR device. Therefore, how to achieve the requirements of simple focal length adjustment, wide focal length adjustment range, and easy manufacturing and shaping of the structure of the VR optical module is an issue to be solved currently.

[0004] Therefore, there is a need to provide a new optical module and VR device.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of the present invention is to provide an optical module and a VR device that solve the technical problems of small change in the viewing angle and poor visual experience effect of the conventional VR optical module.

Means for Solving the Problems

[0006] The technical solution of the present invention is as follows: One aspect of the present invention provides an optical module for a VR device. The optical module includes a holder assembly, a focus adjustment assembly rotatably provided on the holder assembly, a screen assembly fixedly provided on the holder assembly, and a lens assembly provided within the focus adjustment assembly. The holder assembly further 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 further includes a lens barrel with the lens assembly mounted therein 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 chute formed on the boss and engaging with the spiral guide boss. By rotating axially along the chute on the lens barrel via the spiral guide boss of the focus adjustment member, the lens barrel is moved in the optical axis direction along the guide groove of the screen holder, whereby the distance between the screen assembly and the lens barrel is changed. To prevent the rotating focus adjustment member from moving in the optical axis direction, a limit is formed at the assembly location between the limit platen and the focus adjustment member.

[0007] According to an 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 in a clearance fit such that there is a gap between the inner wall of the screen holder and the outer wall of the lens barrel.

[0008] According to an embodiment of the present invention, on the end face of the assembly of the focus adjustment member and the limit platen, a first protrusion and a second protrusion having a lower height than the first protrusion are formed to protrude along the circumferential direction, and a limit step is provided on the inner wall of the limit platen. When the limit platen and the focus adjustment member are assembled, the first protrusion is locked to the limit step so that the rotating focus adjustment member does not move in the optical axis direction.

[0009] According to an embodiment of the present invention, the focus adjustment assembly further includes a lens barrel cover, a snap fit is provided on the lens barrel cover, and a snap groove engaging with the snap fit is further provided on the outer wall of the lens barrel.

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

[0011] According to an embodiment of the present invention, 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, and the base cover is fixedly connected to the screen holder.

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

[0013] According to an embodiment of the present invention, the screen assembly further includes a heat conduction member, and the heat conduction member is provided on a side of the screen close to the base cover.

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

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

Advantages of the Invention

[0016] The beneficial effects of the present invention are By rotating the helical guide boss of the focus adjustment member axially along the chute in the lens barrel, the lens barrel moves in the optical axis direction along the guide groove of the screen holder. As a result, the distance between the screen assembly and the lens barrel is changed. A limit is formed at the assembly location between the limit platen and the focus adjustment member so that the rotating focus adjustment member does not move in the optical axis direction, realizing simple and wide-range focus adjustment, effectively solving the drawback that the change in the viewing angle of the conventional VR optical module is small and the visual experience effect is not good, overcoming the difficulty of manufacturing and shaping the structure, improving the processing efficiency, and reducing the cost.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

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Figure 8

Embodiments for Carrying Out the Invention

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

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

[0020] Furthermore, referring to FIG. 3, the holder assembly 10 further includes a limit platen 11, a screen holder 13 used for mounting the screen assembly 30, and a seal member 12 provided between the limit platen 11 and the screen holder 13. The limit platen 11 is fixedly connected to the screen holder 13 by a screw. The seal member 12 is mounted on the screen holder 13 and serves to prevent dust and change the frictional force, and a seal ring is preferred. Furthermore, referring to FIG. 4, a guide groove f is provided along the circumferential direction on the inner wall of the screen holder 13. The number of the guide grooves f may be three, and the plurality of guide grooves f are all distributed along the circumferential direction on the inner wall of the screen holder 13.

[0021] Furthermore, referring to FIG. 2, the focus adjustment assembly 20 further includes a lens barrel 21 that houses the lens assembly 40 therein, and a focus adjustment member 22 movably provided 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 realizes focus adjustment by changing the distance between the lens barrel 21 and the screen. Further, referring to FIG. 6, a spiral guide boss e is provided on the inner wall of the focus adjustment member 22, and preferably, three spiral guide bosses e are provided. An etching mark p is provided on the outer wall of the focus adjustment member 22, which has an anti-slip effect and prevents the focus adjustment member 22 from slipping during rotation. Further, referring to FIG. 5, on the outer wall of the lens barrel 21 along the circumferential direction, a boss d that engages with the guide groove f and a chute c that is formed on the boss d and engages with the spiral guide boss e are provided.

[0022] When the spiral guide boss e of the focus adjustment member 22 of the optical module 100 rotates axially along the chute c in the lens barrel 21, the lens barrel 21 moves in the optical axis direction along the guide groove f of the screen holder 13. As a result, the distance between the screen assembly 30 and the lens barrel 21 is changed. To prevent the rotating focus adjustment member 22 from moving in the optical axis direction, a limit is formed at the assembly location of the limit platen 11 and the focus adjustment member 22 to achieve the purpose of focus adjustment. Thereby, simple focus adjustment and a wide range of focus adjustment characteristics are realized. Furthermore, the user's eyes can obtain more information, and the visual experience can be enriched. It should be noted that the rotation angle of the focus adjustment member 22 of the present invention is in the range of 0-70°, and the movement amount between the lens barrel 21 and the screen can be realized to be in the range of 0-3.5 mm. Compared with the conventional 3P-type Pancake focus adjustment type VR optical module, the present invention has the advantages of being lighter and smaller in size, further enhancing the user experience of the product.

[0023] In one possible 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 with a clearance fit so that there is a clearance between the inner wall of the screen holder 13 and the outer wall of the lens barrel 21. Preferably, by designing a one-sided clearance between the lens barrel 21 and the inner wall of the screen holder 13 to be 0.1 mm, the lens barrel 21 and the inner wall of the screen holder 13 are prevented from rubbing against each other, thereby improving the product yield.

[0024] In one possible embodiment, referring to FIG. 6, on the end face of the assembly of the focus adjustment member 22 and the limit platen 11, a first protrusion h and a second protrusion k having a lower height than the first protrusion h are formed protruding along the circumferential direction. Referring to FIG. 7, a limit step g is provided on the inner wall of the limit platen 11. When the limit platen 11 and the focus adjustment member 22 are assembled, the first protrusion h is locked to the limit step g so that the rotating focus adjustment member 22 does not move in the optical axis direction.

[0025] In one possible embodiment, referring to FIGS. 2 and 8, the focus adjustment assembly 20 further includes a lens barrel cover 23 for protecting the lens assembly 40 mounted in the lens barrel 21. The lens barrel cover 23 is provided with a snap fit a, and a snap groove b that engages with the snap fit a is further provided on the outer wall of the lens barrel 21. The number of snap fits a may be one or more, and the snap grooves b are provided in a one-to-one correspondence with the snap fits a. Preferably, the number of snap fits a is one or two, which is easy to remove. The lens barrel cover 23 can protect the lens assembly 40 in the lens barrel 21 from external air environment pollution when it is not in operation, thereby extending the service life of the optical module 100 and improving the user experience.

[0026] In one possible embodiment, referring to FIGS. 1 to 2, the lens assembly 40 further includes a first lens 42, a second lens 43, and a third lens 44 that are sequentially arranged in a direction from being close to the lens barrel cover 23 to being separated from the lens barrel 21. The first lens 42, the second lens 43, and the third lens 44 are fixedly connected to the lens barrel 21 respectively. When assembling, the composite film 41 is attached to the first lens 42, the lens double-sided tape 45 is mounted at the corresponding position of the lens barrel 21, the third lens 44 is fixed to the lens barrel 21 via the lens double-sided tape 45 and pressurized. Further, the second lens 43 is mounted on the lens barrel 21 and adhesively fixed to the lens barrel 21 via a UV tape. Further, the first lens 42 with the composite film 41 attached is mounted on the lens barrel 21 and adhesively fixed to the lens barrel 21 via a UV tape.

[0027] In one possible embodiment, referring to FIGS. 1 to 3, 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 conduction 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 is fixedly connected to the screen holder 13. The attachment member 31 is a material with viscosity and may be a screen double-sided tape. The heat conduction member 33 is a material with heat conductivity and may be a heat conductive silicone pad. The heat conduction member 33 is provided at the rear end of the screen 32 to assist in heat dissipation of the screen 32.

[0028] Referring to FIGS. 1 to 3, the optical module 100 of this embodiment is implemented in the following manner, that is, the composite film 41 is bonded to the first lens 42. Further, the lens double-sided tape 45 is mounted at the corresponding position of the lens barrel 21. Further, the third lens 44 is fixed to the lens barrel 21 via the lens double-sided tape 45 and pressure is maintained. Further, the second lens 43 is mounted on the lens barrel 21 and adhesively fixed to the lens barrel 21 via the UV tape. Further, the first lens 42 with the composite film 41 attached is mounted on the lens barrel 21 and adhesively fixed to the lens barrel 21 via the UV tape. Further, the spiral guide boss e of the focus adjustment member 22 is fitted into the chute c of the lens barrel 21 in a one-to-one correspondence with a clearance fit. Further, the seal member 12 is mounted on the screen holder 13, and grease is applied to the surface of the seal member 12 to reduce the frictional force between the focus adjustment member 22 and the seal member 12. Further, the boss d of the lens barrel 21 is mounted in the guide groove f of the screen holder 13 in a one-to-one correspondence. Further, the focus adjustment member 22 is limited by the limit platen 11. The first protrusion h of the focus adjustment member 22 is locked to the limit step g of the limit platen 11. The limit platen 11 is fixed to the screen holder 13 by screws. Further, the lens barrel cover 23 is mounted at the tip of the lens barrel 21 and is limited in a one-to-one correspondence with the snap groove b of the lens barrel 21 via the snap fit a of the lens barrel cover 23. Further, the sticking member 31 is attached to the inner surface of the screen holder 13. Further, the screen 32 is adhesively fixed inside the screen holder 13 via the sticking member 31. Further, the heat conduction member 33 is attached to the rear end of the screen 32 to increase heat dissipation. Further, the base cover 34 and the 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. For the specific structure of the optical module 100, referring to the above embodiment, since this VR device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, so it will not be described in detail here.

[0030] What has been described above is merely embodiments of the present invention. As should be pointed out here, those skilled in the art can also make improvements on the premise of not departing from the creative concept of this application, and all of these fall within the protection scope of this application.

Claims

1. An optical module applied to a VR device, the optical module comprising: a holder assembly; a focus adjustment assembly rotatably provided on the holder assembly; a screen assembly fixedly provided on the holder assembly; and a lens assembly provided in the focus adjustment assembly. The holder assembly further comprises a limit platen and a screen holder, and a guide groove is provided along the circumferential direction on the inner wall of the screen holder. The focus adjustment assembly further comprises a lens barrel with the lens assembly mounted therein, and a focus adjustment member movably provided on the lens barrel. The focus adjustment member is mounted to limit on 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, a boss engaged with the guide groove and a chute formed on the boss and engaged with the spiral guide boss are provided. When the spiral guide boss of the focus adjustment member rotates axially along the chute on the lens barrel, the lens barrel moves in the optical axis direction along the guide groove of the screen holder, whereby the distance between the screen assembly and the lens barrel is changed. The limit platen and the focus adjustment member form a limit at the assembly position so that the rotating focus adjustment member does not move in the optical axis direction. An optical module characterized by the above.

2. The guide groove of the screen holder and the boss on the outer wall of the lens barrel are fitted in a clearance fit so that there is a gap between the inner wall of the screen holder and the outer wall of the lens barrel. The optical module according to claim 1, characterized by the above.

3. On the end face of the assembly of the focus adjustment member and the limit platen, a first protrusion and a second protrusion having a lower height than the first protrusion are formed protruding along the circumferential direction. A limit step is provided on the inner wall of the limit platen. When the limit platen and the focus adjustment member are assembled, the first protrusion is locked to the limit step so that the rotating focus adjustment member does not move in the optical axis direction. The optical module according to claim 1, characterized by the above.

4. The focus adjustment assembly further includes a lens barrel cover, the lens barrel cover is provided with a snap fit, and the outer wall of the lens barrel is further provided with a snap groove that engages with the snap fit. The optical module according to claim 1, characterized in that.

5. The lens assembly further includes a first lens, a second lens, and a third lens that are arranged in order from a direction close to the lens barrel cover to a direction away from the lens barrel, and the first lens, the second lens, and the third lens are respectively fixedly connected to the lens barrel. The optical module according to claim 2, characterized in that.

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, and the base cover is fixedly connected to the screen holder. The optical module according to claim 1, characterized in that.

7. The screen assembly further includes an adhesive member, and the screen is fixed to the screen holder via the adhesive member. The optical module according to claim 6, characterized in that.

8. The screen assembly further includes a heat conduction member, and the heat conduction member is provided on a side of the screen close to the base cover. The optical module according to claim 7, characterized in that.

9. The holder assembly further includes a seal member provided between the limit platen and the screen holder. The optical module according to claim 1, characterized in that.

10. Comprising the optical module according to any one of claims 1 to 9. The VR device, characterized in that.

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