Knob adjustment mechanism, focal length adjustment device and head-mounted device

Abstract

The present invention belongs to the field of VR technology, and particularly relates to a knob adjustment mechanism, a focal length adjustment device, and a head-mounted device; the knob adjustment mechanism includes a knob and a connecting rod, the connecting rod is axially connected to the knob in a sliding manner and cannot rotate circumferentially, an elastic telescopic member is provided between the knob and the connecting rod, and a transmission gear coaxially arranged with the connecting rod is fixedly connected to the end of the connecting rod away from the knob; the focal length adjustment device includes a barrel assembly, a display assembly, a threaded rod that rotates relative to the barrel assembly and is connected to the display assembly in a transmission manner, a focal length adjustment gear installed on the threaded rod, and a knob adjustment mechanism, the transmission gear of the knob adjustment mechanism is meshed with the focal length adjustment gear; the head-mounted device includes a housing, a guide rod, and a focal length adjustment device, and the knob of the knob adjustment mechanism is rotatably connected to the housing. The problem that the existing adjustment knob cannot be used on a dynamic connection structure is solved, and the focal length can still be adjusted after the position of the barrel assembly is adjusted.

Description

Technical Field

[0001] The present invention belongs to the field of VR technology, and in particular relates to a knob adjustment mechanism, a focal length adjustment device and a head-mounted device. Background Art

[0002] With the development of technology, more and more smart wearable devices are appearing in daily life, such as VR headsets. At present, most VR headsets can adjust the pupil distance and focal length to meet the different needs of users. Since the pupil distance can be adjusted, the two lens barrel components can move relative to each other, resulting in a dynamic connection between the focal length adjustment knob and the lens barrel component. Conventional adjustment knobs cannot use this dynamic connection structure, so a new adjustment knob needs to be developed. Summary of the invention

[0003] The purpose of the present invention is to provide a knob adjustment mechanism, a focal length adjustment device and a head-mounted device, aiming to solve the problem that the existing adjustment knob cannot be used on a dynamic connection structure. The focal length can still be adjusted after the position of the lens barrel assembly is adjusted, which is very convenient to use.

[0004] The present invention is implemented as follows: a knob adjustment mechanism includes a knob and a connecting rod, wherein the connecting rod is axially slidably connected to the knob and cannot rotate circumferentially; an elastic telescopic part is provided between the knob and the connecting rod, and a transmission gear coaxially arranged with the connecting rod is fixedly connected to the end of the connecting rod away from the knob.

[0005] As an improvement, the knob includes a rotating part, a sleeve fixedly connected to the rotating part and coaxially arranged, the connecting rod is inserted into the sleeve, a sliding structure is provided between the connecting rod and the sleeve, and a limit piece is provided at the end of the sleeve away from the rotating part; the elastic telescopic piece is arranged between the bottom of the sleeve and the end of the connecting rod.

[0006] As an improvement, the limiting member is a buckle cover, and a notch extending from the side to the center is provided on the buckle cover.

[0007] As an improvement, the sliding structure includes at least two ridges arranged on the outer surface of the connecting rod and extending circumferentially along the connecting rod, and a sliding groove is provided on the inner wall of the sleeve corresponding to each ridge, and each ridge is respectively inserted into the corresponding sliding groove.

[0008] As an improvement, a flexible strip is provided on the side of the ridge away from the connecting rod.

[0009] As an improvement, the knob adjustment mechanism further includes a mounting frame, and the connecting rod is slidably connected to the mounting frame.

[0010] As an improvement, the mounting frame includes a connecting plate and a slideway integrated with the connecting plate, a card interface is provided on the slideway, and the connecting rod is carded into the slideway and can slide along the slideway.

[0011] The present invention is implemented as follows: a focus adjustment device, which includes a lens barrel assembly, a display assembly arranged on the front side of the lens barrel assembly, a threaded rod extending in the front-to-back direction is provided between the lens barrel assembly and the display assembly, the threaded rod and the lens barrel assembly can rotate relative to each other and are transmission-connected with the display assembly, a focus adjustment gear is installed on the end of the threaded rod located on the lens barrel assembly side; and the knob adjustment mechanism is also included, and the transmission gear is meshed with the focus adjustment gear.

[0012] As an improvement, at least two threaded rods are provided between the lens barrel assembly and the display assembly, the focus adjustment gear is respectively mounted on each threaded rod, and a transmission structure is provided between at least two of the focus adjustment gears; the transmission gear of the knob adjustment mechanism is meshed with one of the focus adjustment gears.

[0013] As an improvement, the lens barrel assembly and the display assembly are arranged in two groups at intervals, and the knob adjustment mechanism is provided at each group of the lens barrel assembly and the display assembly.

[0014] As an improvement, three threaded rods are respectively arranged between each group of the lens barrel assembly and the display assembly, and the three threaded rods are respectively arranged at the upper part, the lower part and the outer part of the lens barrel assembly; the transmission gear of the knob adjustment mechanism is meshed with the focal length adjustment gear on the outer part.

[0015] As an improvement, the transmission structure is a gear belt, and a belt steering structure is provided between the upper focus adjustment gear and the outer focus adjustment gear, and between the lower focus adjustment gear and the outer focus adjustment gear, respectively. The belt steering structure includes an outer steering member and an inner steering member arranged on the lens barrel assembly, and the outer belt body of the gear belt is wound around the outer steering member, and the inner belt body is wound around the inner steering member.

[0016] As an improvement, the gear belts are respectively provided between the focus adjustment gear on the outer side and the focus adjustment gear on the upper side, and between the focus adjustment gear on the outer side and the focus adjustment gear on the lower side; the focus adjustment gear on the outer side is a step gear, and the two gear belts are wrapped around the small outer diameter wheel body part of the step gear.

[0017] As an improvement, the lens barrel assembly includes a barrel body, a mounting plate arranged at the outer side of the large end of the barrel body, and a mounting hole is provided on the mounting plate corresponding to each of the threaded rods; the display assembly includes an adjustment bracket, a display screen installed on the adjustment bracket, and a threaded hole is provided on the adjustment bracket corresponding to each of the threaded rods.

[0018] The present invention is implemented in this way. A head-mounted device includes a shell, a guide rod fixed in an area surrounded by the shell, and the focal length adjustment device, the lens barrel assembly is installed on the guide rod and can slide along the guide rod, and the knob of the knob adjustment mechanism is rotatably connected to the shell.

[0019] Due to the adoption of the above technical scheme, the knob adjustment mechanism of the present invention includes a knob and a connecting rod, the connecting rod is axially slidably connected to the knob and cannot rotate circumferentially, an elastic telescopic part is provided between the knob and the connecting rod, and a transmission gear coaxially arranged with the connecting rod is fixedly connected to the end of the connecting rod away from the knob; the focal length adjustment device includes a barrel assembly and a display assembly arranged on the front side of the barrel assembly, a threaded rod extending in the front-to-back direction is provided between the barrel assembly and the display assembly, the threaded rod and the barrel assembly can rotate relative to each other and are transmission-connected to the display assembly, a focus adjustment gear is installed on the end of the threaded rod located on the barrel assembly side, and also includes a knob adjustment mechanism, whose transmission gear is meshed with the focus adjustment gear; the head-mounted device includes a shell, a guide rod fixed in an area surrounded by the shell, and a focus adjustment device, the barrel assembly is installed on the guide rod and can slide along the guide rod, and the knob of the knob adjustment mechanism is rotationally connected to the shell.

[0020] Since the transmission gear is fixed on the connecting rod, the connecting rod can slide relative to the knob along the axial direction, and an elastic telescopic member is provided between the knob and the connecting rod, under the elastic force of the elastic telescopic member, no matter whether the lens barrel assembly moves toward or away from the knob adjustment mechanism, the transmission gear and the focus adjustment gear always remain in meshing under the elastic force of the elastic connecting member, and after the position of the lens barrel assembly is changed, the focus can still be adjusted through the knob adjustment mechanism; the knob adjustment mechanism, the focus adjustment device and the head-mounted device solve the problem that the existing adjustment knob cannot be used on a dynamic connection structure, and the focus can still be adjusted after the position of the lens barrel assembly is adjusted, which is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the main structure of the knob adjustment mechanism of an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the exploded structure of the knob adjustment mechanism of an embodiment of the present invention;

[0023] Figure 3is a schematic diagram of the main structure of the focus adjustment device according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of a top view of the focal length adjustment device according to an embodiment of the present invention;

[0025] Among them, 11, knob, 12, sleeve, 121, slide groove, 13, connecting rod, 131, ridge, 132, flexible strip, 14, transmission gear, 15, mounting frame, 151, slide, 16, buckle cover, 17, elastic telescopic member, 21, guide rod, 22a, barrel assembly, 22b, barrel assembly, 221, barrel body, 222, mounting plate, 223, outer steering member, 224, inner steering member, 23a, display assembly, 23b, display assembly, 31, transmission shaft, 32, threaded sleeve, 33, threaded part, 34, pupil distance adjustment wheel, 35, passive gear, 41, threaded rod, 42, focus adjustment gear, 43, gear belt, 44, guide shaft. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Figures 1 to 4 : is a schematic diagram of the structure of the knob adjustment mechanism of the embodiment of the present invention, wherein: Figure 1 The figure shows a schematic diagram of the main structure of the knob adjustment mechanism according to an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram showing the exploded structure of the knob adjustment mechanism according to an embodiment of the present invention. Figure 3 FIG. 2 is a schematic diagram showing the main structure of a focus adjustment device according to an embodiment of the present invention. Figure 4 The schematic diagram of the top view of the focus adjustment device according to an embodiment of the present invention is shown. For the convenience of description, only the parts related to the present invention are shown in the figure.

[0028] Depend on Figure 1 and Figure 2 It can be seen that the knob adjustment mechanism includes a knob 11 and a connecting rod 13, which is slidably connected to the knob 11 along the axial direction and cannot rotate circumferentially; an elastic telescopic member 17 is provided between the knob 11 and the connecting rod 13, and a transmission gear 14 coaxially arranged with the connecting rod 13 is fixedly connected to the end of the connecting rod 13 away from the knob 11.

[0029] Combination Figure 3 and Figure 4 The installation and use of the knob adjustment mechanism are explained as follows:

[0030] The knob 11 is mounted on the housing of the head mounted device and the transmission gear 14 is meshed with the focus adjustment gear 42 of the focus adjustment device. The knob 11 can rotate relative to the housing. The knob 11 is rotated to drive the focus adjustment gear 42 of the focus adjustment device to rotate through the connecting rod 13 and the transmission gear 14, so as to achieve focus adjustment. When the pupil distance between the lens barrel assembly 22a and the lens barrel assembly 22b is increased, the lens barrel assembly 22a and the lens barrel assembly 22b move outward, and the focus adjustment gear 42 will squeeze the transmission gear 14. Since the transmission gear 14 is fixed on the connecting rod 13, the connecting rod 13 can slide relative to the knob 11 in the axial direction, and an elastic telescopic member 17 is provided between the knob 11 and the connecting rod 13, the transmission gear 14 moves toward the knob 11 and the elastic telescopic member 17 is compressed by the connecting rod 13. Under the elastic force of the elastic telescopic member 17, the transmission gear 14 is always engaged with the focus adjustment gear 42. After the position of the lens barrel assembly is changed, the focal length can still be adjusted by the knob adjustment mechanism; when the pupil distance between the lens barrel assembly 22a and the lens barrel assembly 22b is adjusted to a smaller size, the lens barrel assembly 22a and the lens barrel assembly 22b move inwardly, and under the elastic force of the elastic telescopic member 17, the connecting rod 13 and the transmission gear 14 are pushed to move toward the lens barrel assembly on the corresponding side, so that the transmission gear 14 is always engaged with the focus adjustment gear 42. After the position of the lens barrel assembly is changed, the focal length can still be adjusted by the knob adjustment mechanism; the knob adjustment mechanism solves the problem that the existing adjustment knob cannot be used on the dynamic connection structure. After the position of the lens barrel assembly is adjusted, the focal length can still be adjusted, and it is very convenient to use.

[0031] In this embodiment, in order to facilitate the installation of the entire knob adjustment mechanism and the meshing between the transmission gear 14 and the focal length adjustment gear 42, the knob adjustment mechanism further includes a mounting frame 15, and the connecting rod 13 is slidably connected to the mounting frame 15.

[0032] Specifically, the mounting frame 15 includes a connecting plate and a slide 151 integrated with the connecting plate. A card interface is provided on the slide 151 to facilitate the connecting rod 13 to be stuck into the slide 151. The connecting rod 13 is stuck in the slide 151 and can slide along the slide 15. The mounting frame 15 can strengthen the connection between the knob adjustment mechanism and the housing of the head-mounted device, and can also guide the sliding of the connecting rod 13.

[0033] In this embodiment, the knob 11 includes a rotating part and a sleeve 12 fixedly connected to the rotating part. The sleeve 12 is coaxially arranged with the rotating part. Usually, the sleeve 12 of the knob 11 is rotatably connected to the outer shell through a thin-walled bearing, a bushing, etc.; the connecting rod 13 is inserted into the sleeve 12, and a sliding structure is provided between the connecting rod 13 and the sleeve 12. The elastic telescopic part 17 is arranged between the bottom of the sleeve 12 and the end of the connecting rod 13, and a limit part is provided at the end of the sleeve 12 away from the rotating part.

[0034] Specifically, the limiting member is a buckle cover 16. Since the transmission gear 14, the connecting rod 13, and the sliding structure are usually an integrated structure, in order to facilitate the connecting rod 13 to pass through the buckle cover 16, a notch extending from the side to the center is provided on the buckle cover 16 to facilitate the connecting rod 13 to be stuck on the buckle cover 16 and pass through the buckle cover 16.

[0035] Specifically, the sliding structure includes at least two ribs 131 arranged on the outer surface of the connecting rod 13 and extending circumferentially along the connecting rod 13, and a slide groove 121 is respectively arranged on the inner side wall of the sleeve 12 corresponding to each rib 131, and each rib 131 is respectively inserted into the corresponding slide groove 121. In order to facilitate the sliding between the connecting rod 13 and the sleeve 12, a flexible strip 32 made of rubber, silicone, etc. is arranged on the side of the rib 131 away from the connecting rod 131, and the elasticity of the flexible strip 32 can make the connecting rod 13 and the sleeve 12 coaxially arranged. Usually, a plurality of ribs 131 are arranged at intervals along the axial direction of the connecting rod 13, and a flexible strip 32 is respectively arranged on the side of each rib 131 away from the connecting rod 131, and a slide groove 121 is respectively arranged on the inner side wall of the sleeve 12 corresponding to each rib 131.

[0036] In this embodiment, the transmission gear 14 is a crown gear, and the focus adjustment gear 42 is a spur gear. Of course, the transmission gear 14 can also be set as a bevel gear, and the corresponding focus adjustment gear 42 should also be set as a bevel gear.

[0037] In this embodiment, the elastic telescopic member 17 is a spring, or an elastic column made of elastic rubber.

[0038] The side of the head mounted device closer to the user's head is defined as the back, and the side farther from the user's head is defined as the front.

[0039] Depend on Figure 3 and Figure 4 It can be seen that the present invention also relates to a focus adjustment device, which includes a barrel assembly, a display assembly arranged at the front side of the barrel assembly, a threaded rod 41 extending in the front-to-back direction is arranged between the barrel assembly and the display assembly, the threaded rod 41 and the barrel assembly can rotate relative to each other, and is in transmission connection with the display assembly, and generally, the threaded rod 41 is a rectangular thread for easy transmission; and also includes the above-mentioned knob adjustment mechanism, the transmission gear 14 of the knob adjustment mechanism is meshed with a focus adjustment gear 42. Specifically, at least two threaded rods 41 are arranged between the barrel assembly and the display assembly, and a focus adjustment gear 42 is respectively installed on each threaded rod 41, a transmission structure is arranged between at least two focus adjustment gears 42, and the transmission gear 14 of the knob adjustment mechanism is meshed with one of the focus adjustment gears 42.

[0040] The transmission gear 14 of the knob adjustment mechanism is meshed with the focus adjustment gear 42, and the knob 12 is turned (specifically, the rotating part of the knob 12 is turned) and the focus adjustment gear 42 is driven to rotate through the connecting rod 13 and the transmission gear 14, and the adjustment gear 42 is fixedly connected to the threaded rod 41. The rotation of the knob 12 can drive the threaded rod 41 to rotate. Since the threaded rod 41 is rotationally connected to the lens barrel assembly and transmission-connected to the display assembly, when at least two threaded rods 41 between the lens barrel assembly and the display assembly rotate, the display assembly slides along the threaded rod 41 to achieve focal length adjustment; after the pupil distance is adjusted, the position of the lens barrel assembly changes. , moves toward the direction approaching the knob adjustment mechanism or away from the knob adjustment mechanism, the distance between the lens barrel assembly and the knob adjustment mechanism changes, since the transmission gear 14 is fixed on the connecting rod 13, the connecting rod 13 can slide relative to the knob 11 along the axial direction, and an elastic telescopic member 17 is provided between the knob 11 and the connecting rod 13, under the elastic force of the elastic telescopic member 17, the transmission gear 14 is always engaged with the focal length adjustment gear 42, and after the position of the lens barrel assembly is changed, the focal length can still be adjusted by the knob adjustment mechanism, which solves the problem that the existing adjustment knob cannot be used for a dynamic connection structure, and is very convenient to use.

[0041] In this embodiment, the lens barrel assembly and the display assembly are arranged in two groups at intervals, such as Figure 4 As shown, the lens barrel assembly 22a and the display assembly 23a, the lens barrel assembly 22b and the display assembly 23b, and each group of lens barrel assemblies and display assemblies are respectively provided with the above-mentioned knob adjustment mechanism, and the figure only shows the knob adjustment mechanism at one side.

[0042] Specifically, three threaded rods 41 are respectively arranged between each set of lens barrel assembly and display assembly, and the three threaded rods 41 are respectively arranged at the upper part, lower part and outer part of the lens barrel assembly, and the transmission gear 14 of the knob adjustment mechanism is meshed with the focal length adjustment gear 42 at the outer part.

[0043] In the present embodiment, the transmission structure is a gear belt 43. Since three focus adjustment gears 42 are respectively arranged at the upper part, the lower part and the outer part of the lens barrel assembly, it is necessary to respectively arrange a belt steering structure between the focus adjustment gear 42 at the upper part and the focus adjustment gear 42 at the outer part, and between the focus adjustment gear 42 at the lower part and the focus adjustment gear 42 at the outer part. The belt steering structure comprises an outer steering member 223 and an inner steering member 224 arranged on the lens barrel assembly. The outer belt body of the gear belt 43 is wound around the outer steering member 223, and the inner belt body is wound around the inner steering member 224. Specifically, the outer steering member 223 is an arc plate, and the inner steering member 224 is a cylinder. Of course, the transmission structure can also be provided with a plurality of intermediate gears between two adjacent focus adjustment gears 42 for transmission.

[0044] In order to ensure that the three focal length adjustment gears 42 can rotate simultaneously, gear belts 43 are respectively provided between the outer focal length adjustment gear 42 and the upper focal length adjustment gear 42, and between the outer focal length adjustment gear 42 and the lower focal length adjustment gear 42; the outer focal length adjustment gear 42 is a step gear, and the two gear belts 43 are wrapped around the small outer diameter wheel body part of the step gear. Of course, the upper focal length adjustment gear 42 and the lower focal length adjustment gear 42 can also be set in the form of step gears.

[0045] In the present embodiment, lens barrel assembly 22a, lens barrel assembly 22b respectively comprise barrel 221, mounting plate 222 arranged at outer side edge of barrel 221 large port, and lens installed at barrel 221 small port, on mounting plate 222, corresponding to each threaded rod 41, mounting hole is respectively provided, outer side steering member 223, inner side steering member 224 are arranged on mounting plate 222, specifically, threaded rod 41 can be installed on mounting hole by thin-walled bearing, axle sleeve etc., can realize relative rotation of threaded rod 41 and lens barrel assembly and do not move axially. Of course, in order to reduce weight, lens barrel assembly 22a, lens barrel assembly 22b slide along guide rod 21, can be provided with notch on mounting plate 222 part between focal length adjustment gear 42 at top and focal length adjustment gear 42 at outer side, between focal length adjustment gear 42 at bottom and focal length adjustment gear 42 at outer side, make the threaded rod 41 at focal length adjustment gear 42 corresponding to top, the threaded rod 41 at focal length adjustment gear 42 corresponding to bottom form protruding mounting part.

[0046] The display assembly 23a and the display assembly 23b respectively include an adjustment bracket, a display screen mounted on the adjustment bracket, and an outer cover covering the display screen. A threaded hole is respectively provided on the adjustment bracket corresponding to each threaded rod 41.

[0047] Furthermore, in order to prevent the display component 23a from colliding with the lens barrel component 22a, and the display component 23b from colliding with the lens barrel component 22b and damaging the display component 23a and the display component 23b, a flexible ring is provided on the side of the adjustment bracket close to the lens barrel component. The flexible ring is usually made of rubber, silicone, etc.

[0048] In this embodiment, in order to facilitate the relative movement between the lens barrel assembly 22a and the display assembly 23a, and between the lens barrel assembly 22b and the display assembly 23b, a guide shaft 44 is further provided between the lens barrel assembly 22a and the display assembly 23a, the guide shaft 44 is fixed on the mounting plate 222 of the lens barrel assembly and passes through the guide hole on the adjustment bracket of the display assembly, and the range of focal length adjustment can be limited by the guide shaft 44. Specifically, a sliding sleeve is provided on the adjustment bracket corresponding to the guide shaft 44.

[0049] Usually, two guide shafts 44 are provided corresponding to the lens barrel assembly and the display assembly on the same side, and are respectively arranged on the upper and lower sides of the outer threaded rod 41 .

[0050] The present invention also relates to a head-mounted device, which includes a shell, a guide rod 21 fixed in an area surrounded by the shell, a lens barrel assembly 22a and a lens barrel assembly 22b are installed on the guide rod 21 and can slide along the guide rod 21 respectively, and the above-mentioned knob adjustment mechanism is respectively provided at the lens barrel assembly 22a and the lens barrel assembly 22b on each side of the shell, and the knob 12 of the knob adjustment mechanism is rotatably connected to the shell; the guide rod 21 is arranged on the same side of the lens barrel assembly 22a and the lens barrel assembly 22b; an interpupillary distance adjustment mechanism is provided between the lens barrel assembly 22a and the lens barrel assembly 22b, and the interpupillary distance adjustment mechanism is provided. The structure includes a transmission shaft 31 which is respectively arranged on the other side of the lens barrel assembly 22a and the lens barrel assembly 22b away from the guide rod 21 and parallel to the guide rod 21, a passive gear 35 which is respectively arranged on the adjacent ends of the two transmission shafts 31, and an interpupillary distance adjustment wheel 34 which is meshed with the two passive gears 35 and is used to drive the passive gears 35 to rotate. The lens barrel assembly 22a and the lens barrel assembly 22b are respectively connected with a threaded sleeve 32 which is sleeved on the transmission shaft 31, and a threaded portion 33 which is threadedly connected to the threaded sleeve 32 is provided at a corresponding position on the transmission shaft 31. Usually, the interpupillary distance adjustment wheel 34 is rotatably connected to the housing through a support plate or a mounting shaft.

[0051] Since the two passive gears 35 are respectively installed on the transmission shafts 31 on both sides, the two passive gears 35 can be driven to rotate in opposite directions by rotating the pupil distance adjustment wheel 34, and threaded sleeves 32 threadedly connected to the transmission shaft 31 are respectively provided on the lens barrel assembly 22a and the lens barrel assembly 22b. The lens barrel assembly 22a and the lens barrel assembly 22b can be moved toward or away from each other along the guide rod 21 by rotating the transmission shaft 31, thereby achieving the purpose of adjusting the pupil distance. After the pupil distance is adjusted, the distance between the lens barrel assembly 22a, the lens barrel assembly 22b and the corresponding side knob adjustment mechanism will change. Since the transmission gear 14 is fixed on the connecting rod 13, the connecting rod 13 can slide relative to the knob 11 along the axial direction, and an elastic telescopic member 17 is provided between the knob 11 and the connecting rod 13, under the elastic force of the elastic telescopic member 17, the transmission gear 14 is always engaged with the focal length adjustment gear 42. After the position of the lens barrel assembly is changed, the focal length can still be adjusted by the knob adjustment mechanism, which solves the problem that the existing adjustment knob cannot be used for a dynamic connection structure and is very convenient to use.

[0052] Specifically, the pupil distance adjustment wheel 34 is a crown gear, and the two passive gears 35 are spur gears. Of course, the pupil distance adjustment wheel 34 can also be a bevel gear, and the corresponding two passive gears 35 are also configured as bevel gears.

[0053] The above descriptions are only some embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A knob adjustment mechanism, applied to a head-mounted device, characterized in that: It includes a knob and a connecting rod, the connecting rod is slidably connected to the knob along the axial direction and cannot rotate circumferentially, and the knob is rotatably installed on the shell of the head-mounted device; an elastic telescopic part is provided between the knob and the connecting rod, and a transmission gear coaxially arranged with the connecting rod is fixedly connected to the end of the connecting rod away from the knob, and the transmission gear is meshed with a focus adjustment gear on the lens barrel assembly on the corresponding side of the head-mounted device; the knob includes a rotating part, a sleeve fixedly connected to the rotating part and coaxially arranged, the connecting rod is inserted into the sleeve, a sliding structure is provided between the connecting rod and the sleeve, and a limit piece is provided at the end of the sleeve away from the rotating part; the elastic telescopic part is arranged between the bottom of the sleeve and the end of the connecting rod.

2. The knob adjustment mechanism according to claim 1, characterized in that: The limiting member is a buckle cover, and a notch extending from the side to the center is provided on the buckle cover.

3. The knob adjustment mechanism according to claim 1, characterized in that: The sliding structure comprises at least two ridges arranged on the outer side surface of the connecting rod and extending along the circumference of the connecting rod, and a sliding groove is respectively arranged on the inner side wall of the sleeve corresponding to each ridge, and each ridge is respectively inserted into the corresponding sliding groove.

4. The knob adjustment mechanism according to claim 3, characterized in that: A flexible strip is provided on the side of the convex ridge away from the connecting rod.

5. The knob adjustment mechanism according to any one of claims 1 to 4, characterized in that: The knob adjustment mechanism also includes a mounting frame, and the connecting rod is slidably connected to the mounting frame.

6. The knob adjustment mechanism according to claim 5, characterized in that: The mounting frame comprises a connecting plate and a slideway which is integrated with the connecting plate. A card interface is arranged on the slideway. The connecting rod is carded into the slideway and can slide along the slideway.

7. A focal length adjustment device, comprising a lens barrel assembly and a display assembly arranged on the front side of the lens barrel assembly, characterized in that: A threaded rod extending in the front-to-back direction is provided between the lens barrel assembly and the display assembly, the threaded rod and the lens barrel assembly can rotate relative to each other and is transmission-connected to the display assembly, a focus adjustment gear is installed on the end of the threaded rod located on the lens barrel assembly side; and the threaded rod also includes a knob adjustment mechanism as described in any one of claims 1 to 6, the transmission gear of the knob adjustment mechanism is meshed with the focus adjustment gear.

8. The focus adjustment device according to claim 7, characterized in that: At least two threaded rods are provided between the lens barrel assembly and the display assembly, and the focus adjustment gear is installed on each threaded rod. A transmission structure is provided between at least two focus adjustment gears; the transmission gear of the knob adjustment mechanism is meshed with one of the focus adjustment gears.

9. The focus adjustment device according to claim 8, characterized in that: The lens barrel assembly and the display assembly are arranged in two groups at intervals, and the knob adjustment mechanism is respectively arranged at each group of the lens barrel assembly and the display assembly.

10. The focus adjustment device according to claim 9, characterized in that: Three threaded rods are respectively arranged between each group of the lens barrel assembly and the display assembly, and the three threaded rods are respectively arranged at the upper part, the lower part and the outer part of the lens barrel assembly; the transmission gear of the knob adjustment mechanism is meshed with the focal length adjustment gear at the outer part.

11. The focus adjustment device according to claim 10, characterized in that: The transmission structure is a gear belt, and a belt steering structure is provided between the upper focus adjustment gear and the outer focus adjustment gear, and between the lower focus adjustment gear and the outer focus adjustment gear, respectively. The belt steering structure includes an outer steering member and an inner steering member arranged on the lens barrel assembly, and the outer belt body of the gear belt is wound around the outer steering member, and the inner belt body is wound around the inner steering member.

12. The focus adjustment device according to claim 11, characterized in that: The gear belts are respectively arranged between the focus adjustment gear on the outer side and the focus adjustment gear on the upper side, and between the focus adjustment gear on the outer side and the focus adjustment gear on the lower side; the focus adjustment gear on the outer side is a step gear, and the two gear belts are wrapped around the small outer diameter wheel body part of the step gear.

13. The focus adjustment device according to any one of claims 7 to 12, characterized in that: The lens barrel assembly includes a barrel body and a mounting plate arranged at the outer side of the large end of the barrel body, and mounting holes are respectively provided on the mounting plate corresponding to each of the threaded rods; the display assembly includes an adjustment bracket and a display screen installed on the adjustment bracket, and threaded holes are respectively provided on the adjustment bracket corresponding to each of the threaded rods.

14. A head mounted device comprising a housing and a guide rod fixed within an area enclosed by the housing, characterized in that: It also includes the focus adjustment device as described in any one of claims 7 to 13, the lens barrel assembly is mounted on the guide rod and can slide along the guide rod, and the knob of the knob adjustment mechanism is rotatably connected to the housing.

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