Focal length adjusting mechanism and head-mounted display device

Abstract

The invention discloses a focal length adjusting mechanism and a head-mounted display device.The focal length adjusting mechanism comprises an installation support and a lens cone structure, the lens cone structure comprises a display assembly and a lens assembly, the display assembly is fixed to the installation support, an adjusting rack is installed on the lens assembly, an adjusting gear is arranged on the installation support, and the adjusting gear is meshed with the adjusting rack. The adjusting gear is in meshing transmission with the adjusting rack so as to drive the lens assembly to move in the direction away from or close to the display assembly. The mounting support is further provided with a first guide supporting part, the lens assembly is provided with the second guide supporting part, and the first guide supporting part and the second guide supporting part interact to guide movement of the lens assembly. According to the technical scheme, focal length adjustment of the head-mounted display equipment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of head mounted display devices, and in particular to a focal length adjustment mechanism and a head mounted display device. Background Art

[0002] In the prior art, most head-mounted display devices, such as AR and VR devices, cannot adjust the focal length, which is a very poor experience for the large number of myopic consumers. Some head-mounted display devices provide a solution for personalized lens customization, that is, the lens can be replaced with a convex lens with a certain degree. However, the disadvantages of this solution are quite obvious. First, frequent replacement of lenses can easily damage the assembly structure between components; second, an additional lens fee needs to be paid, and one lens is only suitable for one head-mounted display user, which is not universal. Summary of the invention

[0003] The main purpose of the present invention is to provide a focus adjustment mechanism, aiming to achieve focus adjustment of a head-mounted display device.

[0004] To achieve the above object, the focus adjustment mechanism proposed in the present invention comprises:

[0005] Mounting bracket;

[0006] The lens barrel structure comprises a display assembly and a lens assembly, wherein the display assembly is fixed on the mounting bracket, an adjusting rack is mounted on the lens assembly, and an adjusting gear is arranged on the mounting bracket, wherein the adjusting gear meshes with the adjusting rack to drive the lens assembly to move away from or towards the display assembly;

[0007] The mounting bracket is provided with a first guide support portion, and the lens assembly is provided with a second guide support portion, and the first guide support portion interacts with the second guide support portion to guide the movement of the lens assembly.

[0008] Optionally, one of the first guide support portion and the second guide support portion is a guide groove, and the other is a guide protrusion, and the guide protrusion is slidably installed in the guide groove.

[0009] Optionally, the guide groove is configured as a dovetail groove, and the corresponding guide protrusion is configured as a dovetail protrusion.

[0010] Optionally, the second guide support portion and the adjustment rack are disposed on opposite sides of the lens assembly.

[0011] Optionally, the display assembly includes a first lens barrel and a display screen installed in the first lens barrel, and the first lens barrel is fixed on the mounting bracket.

[0012] Optionally, the lens assembly includes a second lens barrel and a lens, wherein the lens is mounted on one end of the second lens barrel away from the display assembly, and the other end of the second lens barrel is movably sleeved on the outer periphery of the display assembly.

[0013] Optionally, a first recessed groove is formed at one end of the second lens barrel away from the display assembly, the lens is installed in the first recessed groove, and the annular cover plate is pressed onto the periphery of the lens away from the display assembly.

[0014] Optionally, a second recessed groove is formed at one end of the second lens barrel close to the display assembly, and the second recessed groove is movably sleeved on the outer periphery of the display assembly.

[0015] Optionally, the focal length adjustment mechanism further includes a driving motor, which is fixedly mounted on the mounting bracket and is used to drive the adjusting gear to rotate.

[0016] The present invention also provides a head mounted display device, comprising the focus adjustment mechanism as described above.

[0017] The technical solution of the present invention is to fix the display assembly on the mounting bracket, install an adjustment rack on the lens assembly, and set an adjustment gear on the mounting bracket. The adjustment gear meshes with the adjustment rack to drive the lens assembly to move away from or close to the display assembly; thereby adjusting the distance between the lens assembly and the display assembly, and then adjusting the focal length of the head-mounted display device to adapt to human eyes of different approximate degrees, thereby improving the universality of the application of the head-mounted display device. The gear rack meshing transmission has a simple structure and occupies a small space, which is conducive to the miniaturization of the head-mounted device. The mounting bracket is provided with a first guide support part, and the lens assembly is provided with a second guide support part. The first guide support part interacts with the second guide support part to guide the movement of the lens assembly, further improving the stability of the movement of the lens assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a focal length adjustment mechanism of the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional view of the focal length adjustment mechanism;

[0021] Figure 3 for Figure 1 An exploded view of the focal length adjustment mechanism at one angle;

[0022] Figure 4 for Figure 1 Another exploded view of the focal length adjustment mechanism.

[0023] Description of Figure Numbers:

[0024] Label name Label name 100 Focus adjustment mechanism 141 Adjustment rack 110 Mounting Bracket 142 Second guide support portion 111 Adjustment gear 143 Guide protrusion 112 First guide support portion 144 Second lens barrel 113 Guide groove 145 lens 120 Lens tube structure 146 First sink 130 Display Components 147 Ring cover 131 First lens barrel 148 Second sink 132 Display 150 Drive motor 140 Lens components

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The present invention provides a focus adjustment mechanism 100 .

[0030] In the embodiment of the present invention, Figures 1 to 4As shown, the focus adjustment mechanism 100 includes a mounting bracket 110 and a lens barrel structure 120, the lens barrel structure 120 includes a display assembly 130 and a lens assembly 140, the display assembly 130 is fixed on the mounting bracket 110, an adjustment rack 141 is installed on the lens assembly 140, an adjustment gear 111 is provided on the mounting bracket 110, the adjustment gear 111 and the adjustment rack 141 are meshed and transmitted to drive the lens assembly 140 to move away from or close to the display assembly 130; a first guide support portion 112 is provided on the mounting bracket 110, and a second guide support portion 142 is provided on the lens assembly 140, the first guide support portion 112 and the second guide support portion 142 interact with each other to guide the movement of the lens assembly 140.

[0031] Specifically, the mounting bracket 110 is fixedly mounted in the housing of the head-mounted display device, so that the focal length adjustment mechanism 100 is fixed in the head-mounted display device. The lens barrel assembly includes a display assembly 130 and a lens assembly 140, and the user can view the display information of the display assembly 130 through the lens assembly 140. The display assembly 130 is fixed on the mounting bracket 110, and the lens assembly 140 can move relative to the display assembly 130, so as to adjust the distance between the lens assembly 140 and the display assembly 130, and then adjust the focal length of the head-mounted display device to adapt to human eyes with different myopia degrees, thereby improving the universality of the application of the head-mounted display device. In addition, an adjustment rack 141 is installed on the lens assembly 140, and an adjustment gear 111 is provided on the mounting bracket 110. The adjustment gear 111 is meshed with the adjustment rack 141 for transmission, thereby driving the lens assembly 140 to move in a direction away from or close to the display assembly 130, so that the lens assembly 140 moves relative to the display assembly 130. The structure is simple, the space occupied is small, and it is helpful for the head-mounted device to develop towards miniaturization. A first guide support portion 112 is provided on the mounting bracket 110, and a second guide support portion 142 is provided on the lens assembly 140. The first guide support portion 112 interacts with the second guide support portion 142 to guide the movement of the lens assembly 140, thereby further improving the movement stability of the lens assembly 140.

[0032] The mounting bracket 110 may be fixedly mounted in a housing of the head mounted display device by a fastener, and the fastener may be configured as a fastening screw.

[0033] In one embodiment, the focus adjustment mechanism 100 further includes a drive motor 150, which is fixedly mounted on the mounting bracket 110 and is used to drive the adjustment gear 111 to rotate. Specifically, the drive motor 150 can drive the adjustment gear 111 to rotate, thereby driving the adjustment rack 141 to drive the lens assembly 140 to move, thereby achieving automatic focus adjustment of the head mounted display device without manual adjustment by the user, which is convenient, fast and highly accurate.

[0034] The technical solution of the present invention is that the display assembly 130 is fixed on the mounting bracket 110, an adjustment rack 141 is installed on the lens assembly 140, and an adjustment gear 111 is provided on the mounting bracket 110. The adjustment gear 111 and the adjustment rack 141 are meshed and transmitted to drive the lens assembly 140 to move away from or close to the display assembly 130; thereby adjusting the distance between the lens assembly 140 and the display assembly 130, and then adjusting the focal length of the head-mounted display device to adapt to human eyes of different approximate degrees, thereby improving the universality of the application of the head-mounted display device. In addition, the gear rack meshing transmission has a simple structure and occupies a small space, which is conducive to the development of head-mounted devices towards miniaturization. In addition, a first guide support part 112 is provided on the mounting bracket 110, and a second guide support part 142 is provided on the lens assembly 140. The first guide support part 112 interacts with the second guide support part 142 to guide the movement of the lens assembly 140, further improving the movement stability of the lens assembly 140.

[0035] Refer again Figure 1 and Figure 4 In one embodiment, one of the first guide support portion 112 and the second guide support portion 142 is a guide groove 113, and the other is a guide protrusion 143, and the guide protrusion 143 is slidably installed in the guide groove 113. Specifically, the guide protrusion 143 slides in the guide groove 113 to guide the movement of the display assembly 130, and because the second guide support portion 142 is arranged on one side of the lens assembly 140, after the focus adjustment of the head mounted display device is completed, when the lens assembly 140 moves toward the direction close to the display assembly 130 due to its own weight, the gravity of the lens assembly 140 is located at the center of gravity, and the second guide support portion 142 is arranged on one side of the lens assembly 140, and the two are not on the same plane, so that the guide protrusion 143 will be offset at a small angle in the guide groove 113, thereby increasing the friction between the guide protrusion 143 and the guide groove 113, further preventing the lens assembly 140 from shifting, and thus ensuring the adjustment accuracy of the focus adjustment mechanism 100. However, when the adjusting gear 111 and the adjusting rack 141 are meshed and driven to drive the lens assembly 140 to move in a direction away from the display assembly 130, since the adjusting gear 111 and the adjusting rack 141, the guide groove 113 and the guide protrusion 143 jointly guide the movement of the lens assembly 140, excessive friction will not occur.

[0036] Preferably, the guide groove 113 is configured as a dovetail groove, and the corresponding guide protrusion 143 is configured as a dovetail protrusion. Specifically, the dovetail protrusion cooperates with the dovetail groove for guidance, and can prevent the dovetail protrusion from accidentally detaching from the dovetail groove, thereby further ensuring the guiding stability of the guide groove 113.

[0037] Further, the second guide support portion 142 and the adjustment rack 141 are disposed on opposite sides of the lens assembly 140. Specifically, the second guide support portion 142 and the adjustment rack 141 are disposed on opposite sides of the lens assembly 140, that is, the connecting line of the second guide support portion 142 and the adjustment rack 141 is arranged to coincide with the diameter of the lens assembly 140, so that when the adjustment gear 111 and the adjustment rack 141 drive the lens assembly 140 to move, the corresponding guide groove 113 and the guide protrusion 143 jointly guide the movement of the lens assembly 140, and the acting forces of the two are uniformly applied to the opposite sides of the lens assembly 140. Thus, the possibility of self-deviation of the lens assembly 140 during the movement is reduced.

[0038] Refer again Figures 1 to 4 In one embodiment, the display assembly 130 includes a first lens barrel 131 and a display screen 132 installed in the first lens barrel 131, and the first lens barrel 131 is fixed on the mounting bracket 110. Specifically, the first lens barrel 131 is fixed on the mounting bracket 110, and the display screen 132 is installed in the first lens barrel 131, and to ensure the stability of the installation, the display screen 132 can be fixed on the bottom wall of the first lens barrel 131 close to the mounting bracket 110, thereby reducing the possibility of displacement of the display screen 132. Among them, the first lens barrel 131 can be fastened and installed on the mounting bracket 110 by fasteners, and the display screen 132 can also be adhesively fixed to the bottom wall of the first lens barrel 131 close to the mounting bracket 110.

[0039] In one embodiment, the lens assembly 140 includes a second lens barrel 144 and a lens 145. The lens 145 is mounted on one end of the second lens barrel 144 away from the display assembly 130, and the other end is movably sleeved on the outer periphery of the display assembly 130. Specifically, the lens 145 is fixedly mounted on the second lens barrel 144, and the movement of the second lens barrel 144 drives the lens 145 to move, thereby adjusting the focal length. The second lens barrel 144 is always sleeved on the outer periphery of the display assembly 130, thereby further guiding the movement of the second lens barrel 144 and ensuring the stability of the two structures. Among them, the adjustment gear 111 and the second guide support portion 142 can be integrally formed with the second lens barrel 144, or fixed by clamping or bonding.

[0040] Preferably, a second recess 148 is formed at one end of the second lens barrel 144 close to the display assembly 130 , and the second recess 148 is movably sleeved on the outer periphery of the display assembly 130 .

[0041] Furthermore, a first recessed groove 146 is formed at one end of the second lens barrel 144 away from the display assembly 130, the lens 145 is installed in the first recessed groove 146, and the annular cover plate 147 is pressed against the periphery of the lens 145 away from the display assembly 130. Specifically, by installing the lens 145 in the first recessed groove 146, the installation stability of the lens 145 is ensured, and the annular cover plate 147 is pressed against the periphery of the lens 145 away from the display assembly 130, so as to further fix the lens 145. The annular cover plate 147 is clamped and fixed with the second recessed groove 148, so as to facilitate the installation and removal of the display assembly 130.

[0042] The present invention further provides a head-mounted display device, which includes a focus adjustment mechanism 100. The specific structure of the focus adjustment mechanism 100 refers to the above embodiment. Since the head-mounted display device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0043] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A focal length adjustment mechanism, characterized in that: include: Mounting bracket; The lens barrel structure comprises a display assembly and a lens assembly, wherein the display assembly is fixed on the mounting bracket, an adjusting rack is mounted on the lens assembly, and an adjusting gear is arranged on the mounting bracket, wherein the adjusting gear meshes with the adjusting rack to drive the lens assembly to move away from or towards the display assembly; The mounting bracket is provided with a first guide support portion, and the lens assembly is provided with a second guide support portion, and the first guide support portion interacts with the second guide support portion to guide the movement of the lens assembly.

2. The focus adjustment mechanism according to claim 1, characterized in that: One of the first guide support portion and the second guide support portion is a guide groove, and the other is a guide protrusion, and the guide protrusion is slidably installed in the guide groove.

3. The focus adjustment mechanism according to claim 1, characterized in that: The guide groove is configured as a dovetail groove, and the corresponding guide protrusion is configured as a dovetail protrusion.

4. The focus adjustment mechanism according to claim 1, characterized in that: The second guide support portion and the adjusting rack are arranged on two opposite sides of the lens assembly.

5. The focus adjustment mechanism according to claim 1, characterized in that: The display assembly comprises a first lens barrel and a display screen installed in the first lens barrel, and the first lens barrel is fixed on the mounting bracket.

6. The focus adjustment mechanism according to claim 1, characterized in that: The lens assembly comprises a second lens barrel and a lens. The lens is mounted on one end of the second lens barrel away from the display assembly, and the other end of the second lens barrel is movably sleeved on the outer periphery of the display assembly.

7. The focus adjustment mechanism according to claim 6, characterized in that: A first recessed groove is formed at one end of the second lens barrel away from the display assembly, the lens is installed in the first recessed groove, and an annular cover plate is pressed against the periphery of the lens away from the display assembly.

8. The focus adjustment mechanism according to claim 6, characterized in that: A second sinking groove is formed at one end of the second lens barrel close to the display assembly, and the second sinking groove is movably sleeved on the outer periphery of the display assembly.

9. The focus adjustment mechanism according to any one of claims 1 to 8, characterized in that: The focal length adjustment mechanism also includes a driving motor, which is fixedly mounted on the mounting bracket and is used to drive the adjusting gear to rotate.

10. A head mounted display device, characterized in that: Comprising a focus adjustment mechanism as described in any one of claims 1 to 9.

Images