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 comprises a mounting plate, a knob rotatably connected thereto, an arc-shaped slide groove concentric with the knob is provided on the mounting plate, a transmission gear connected to the knob in transmission is installed in the arc-shaped slide groove, and an elastic connector for tightening the rotating shaft; the focal length adjustment device comprises a barrel assembly, a display assembly, a threaded rod that rotates relative to the barrel assembly and is connected to the display assembly in transmission, and a knob adjustment mechanism, a focal length adjustment gear is installed on the end of the threaded rod, and the transmission gear of the knob adjustment mechanism is meshed with the focal length adjustment gear; the head-mounted device comprises a housing, a guide rod, and a focal length adjustment device, and the mounting plate of the knob adjustment mechanism is fixed on 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, which includes a mounting plate, a knob rotatably connected to a side surface of the mounting plate, an arcuate groove concentric with the knob being provided on the mounting plate; a transmission gear installed on the arcuate groove through a rotating shaft and transmission-connected to the knob, and an elastic connecting member arranged between the mounting plate and the rotating shaft for tightening the rotating shaft.

[0005] As an improvement, a driving gear coaxially arranged therewith is fixedly connected to the side surface of the knob, and the driving gear is meshed with the transmission gear.

[0006] As an improvement, one end of the elastic connecting member is fixed to the rotating shaft, and the other end is fixed to the mounting plate portion in the middle radial direction of the arc-shaped sliding groove.

[0007] As an improvement, a retaining wall is provided at the side of the arc-shaped sliding groove, and a flexible ring sleeve is clamped on the retaining wall.

[0008] As an improvement, a spacing is left between the inner wall of the retaining wall and the side of the arc-shaped slide groove; the flexible ring sleeve includes a main ring body, and side plates respectively connected to the two side edges of the main ring body, and the two side plates are respectively inserted into the position between the inner wall of the retaining wall and the side of the arc-shaped slide groove.

[0009] As an improvement, a corresponding fixing column is provided on the side surface of the mounting plate, and the elastic connecting member is connected to the fixing column.

[0010] As an improvement, the elastic connecting member is an elastic band, and slots are respectively provided on the fixing column and the rotating shaft, and the elastic band is wrapped around the two slots.

[0011] As an improvement, an avoidance groove is provided on the mounting plate portion on the side of the transmission gear away from the knob.

[0012] As an improvement, the mounting plate is in a stepped shape, the knob and the driving gear, the arc-shaped slide groove, and the transmission gear are arranged on the same step surface, and the avoidance groove is arranged on another step surface.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] As an improvement, 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 provided on the adjustment bracket corresponding to the threaded rods.

[0020] The present invention is implemented in this way, a head-mounted device, the head-mounted device includes a shell, a guide rod fixed in the area surrounded by the shell, and the focus adjustment device, the lens barrel assembly is installed on the guide rod and can slide along the guide rod, and the mounting plate of the knob adjustment mechanism is fixed on the shell.

[0021] Due to the adoption of the above technical scheme, the knob adjustment mechanism of the present invention includes a mounting plate, a knob rotatably connected to a side surface of the mounting plate, an arcuate slide groove concentric with the knob is provided on the mounting plate, a transmission gear installed on the arcuate slide groove through a rotating shaft and transmission connected to the knob, and an elastic connecting member arranged between the mounting plate and the rotating shaft for tightening the rotating shaft; the focal length adjustment device 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 rotates relative to the lens barrel assembly 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 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 the area surrounded by the shell, and a focus adjustment device, the lens barrel assembly is installed on the guide rod and can slide along the guide rod, and the mounting plate of the knob adjustment mechanism is fixed on the shell.

[0022] Since an arc-shaped groove concentric with the knob is provided on the mounting plate, the transmission gear is installed on the arc-shaped groove through a rotating shaft, and an elastic connecting member is provided between the mounting plate and the rotating shaft, no matter whether the lens barrel assembly moves toward or away from the knob adjustment mechanism, the transmission gear and the focal length adjustment gear always keep meshing under the elastic force of the elastic connecting member, and the transmission gear is connected to the knob in transmission, and after the position of the lens barrel assembly is changed, the focal length can still be adjusted through the knob adjustment mechanism; the knob adjustment mechanism, the focal length 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 focal length 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

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the knob adjustment mechanism of an embodiment of the present invention;

[0024] Figure 2 is a schematic cross-sectional structural diagram of a knob adjustment mechanism according to an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the exploded structure of the knob adjustment mechanism of an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of the three-dimensional structure of a focus adjustment device according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the main structure of the focus adjustment device according to an embodiment of the present invention;

[0028] Figure 6 is a structural schematic diagram of the adjustment state of the focus adjustment device according to an embodiment of the present invention;

[0029] Among them, 11, mounting plate, 111, arc-shaped slide groove, 112, avoidance groove, 113, fixing column, 12, knob, 121, driving gear, 13, rotating shaft, 14, transmission gear, 15, fixing ring, 16, elastic connecting member, 17, flexible ring sleeve, 171, main ring body, 172, side plate, 18, flexible inner lining ring, 21, guide rod, 22a, lens barrel assembly, 22b, lens 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, 41, threaded rod, 42, focus adjustment gear, 43, gear belt, 44, guide shaft. DETAILED DESCRIPTION

[0030] 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.

[0031] Figures 1 to 6 : is a schematic diagram of the structure of the knob adjustment mechanism of the embodiment of the present invention, wherein: Figure 1 FIG. 1 is a schematic diagram showing a three-dimensional structure of a knob adjustment mechanism according to an embodiment of the present invention. Figure 2 FIG. 2 is a schematic cross-sectional view of a knob adjustment mechanism according to an embodiment of the present invention. Figure 3 FIG. 1 is a schematic diagram showing the exploded structure of the knob adjustment mechanism according to an embodiment of the present invention. Figure 4 FIG. 1 is a schematic diagram showing a three-dimensional structure of a focus adjustment device according to an embodiment of the present invention. Figure 5 FIG. 2 is a schematic diagram showing the main structure of a focus adjustment device according to an embodiment of the present invention. Figure 6 The schematic diagram of the structure of the focus adjustment device in the embodiment of the present invention is shown in the adjustment state. For the convenience of description, only the part related to the present invention is shown in the figure.

[0032] 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.

[0033] Depend on Figure 1 , Figure 2 and Figure 3 It can be seen that the knob adjustment mechanism includes a mounting plate 11, a knob 12 rotatably connected to a side surface of the mounting plate 11, an arcuate groove 111 concentric with the knob 12 is provided on the mounting plate 11; and a transmission gear 14 installed on the arcuate groove 111 through a rotating shaft 13 and connected to the knob 12 in transmission, and an elastic connecting member 16 for tightening the rotating shaft 13 is provided between the mounting plate 11 and the rotating shaft 13. Specifically, one end of the elastic connector 16 is fixed on the rotating shaft 13, and the other end is fixed on the part of the mounting plate 11 in the direction of the center radial line of the arc-shaped slot 111. Usually, the position where the elastic connector 16 is fixedly connected to the mounting plate 11 is set on the side of the arc-shaped slot 111 away from the knob 12; the transmission connection between the knob 12 and the transmission gear 14 is achieved in the following manner: a driving gear 121 coaxially arranged therewith is fixedly connected to the side of the knob 12, and the driving gear is meshed with the transmission gear 14 to achieve the transmission connection between the knob 12 and the transmission gear 14; of course, since the arc-shaped slot 111 is concentrically arranged with the knob 12, a belt can also be set between the rotating shaft 13 and the rotating part of the knob 12, and the transmission connection between the knob 12 and the transmission gear 14 can also be achieved by transmitting the power through the belt.

[0034] Combination Figures 4 to 6 The installation and use of the knob adjustment mechanism are explained as follows:

[0035] A knob adjustment mechanism is respectively installed on the side of the corresponding lens barrel assembly 22a and the lens barrel assembly 22b on the shell of the head-mounted device, the mounting plate 11 is fixed on the shell of the head-mounted device, and the transmission gear 14 is meshed with the focus adjustment gear 42 on the corresponding side lens barrel assembly, and the knob 12 is turned to drive the focus adjustment gear 42 to rotate through the driving gear 121 and the transmission gear 14 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 an arc-shaped slide groove 111 concentric with the knob 12 is provided on the mounting plate 11, the focus adjustment gear 42 will push the transmission gear 14 to slide along the arc-shaped slide groove 111, and the transmission gear 14 will always be meshed with the driving gear 121 during the sliding process along the arc-shaped slide groove 111. Since an elastic connecting member 16 is provided between the mounting plate 11 portion in the axial direction of the arc-shaped slide groove 111 and the rotating shaft 13, the transmission gear 14 and the focus adjustment gear 42 are always kept in meshing under the elastic force of the elastic connecting member 16, and the focus can still be adjusted by the knob adjustment mechanism after the position of the lens barrel assembly is changed; 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 the focus adjustment gear 42 will follow the movement inwardly, and under the elastic force of the elastic connecting member 16, the transmission gear 14 slides along the arc-shaped slide groove 111, so that the transmission gear 14 can be kept in meshing with the focus adjustment gear 42 and the driving gear 121; the knob adjustment mechanism solves 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.

[0036] In this embodiment, an avoidance groove 112 is provided on the portion of the mounting plate 11 on the side of the transmission gear 14 away from the knob 12. Since a threaded rod 41 is connected to the focus adjustment gear 42, the mounting plate 11 is prevented from obstructing the threaded rod 41 on the focus adjustment gear 42 when the position of the lens barrel assembly changes.

[0037] In this embodiment, a retaining wall is provided at the side of the arc-shaped slide 111, and a flexible ring sleeve 17 is clamped on the area surrounded by the retaining wall, so that the rotating shaft 13 can slide along the arc-shaped slide 111. Specifically, there is a gap between the inner side wall of the retaining wall and the side of the arc-shaped slide 111; the flexible ring sleeve 17 includes a main ring body 171, and side plates 172 respectively connected to the two sides of the main ring body 171, and the two side plates 172 are respectively inserted into the position between the inner side wall of the retaining wall and the side of the arc-shaped slide 111. Not only can the contact area between the arc-shaped slide 111 and the rotating shaft 13 in its axial direction be increased, so that the sliding of the rotating shaft 13 is more stable; and the side plates 172 are respectively provided at the two sides of the main ring body 171, and the rotating shaft 13 can be placed on the center line of the arc-shaped slide 111 by using its flexibility, so as to ensure the accuracy of sliding and ensure that the transmission gear 14 is meshed with the driving gear 121.

[0038] A fixing ring 15 is provided at the end of the rotating shaft 13 passing through the arc-shaped slide groove 111, and a flexible lining ring 18 is provided between the fixing ring 15 and the rotating shaft 13, so as to realize the installation of the rotating shaft 13 at the arc-shaped slide groove 111. Specifically, the rotating shaft 13 can be fixedly connected with the transmission gear 14; or the rotating shaft 13 directly passes through the transmission gear 14, and the transmission gear 14 and the rotating shaft 13 can rotate relative to each other, and a limiting part is provided at the end of the rotating shaft 13 to prevent the transmission gear 14 from falling off the rotating shaft 13.

[0039] In this embodiment, a fixing column 113 is provided on the side of the mounting plate 11 corresponding to the end of the rotating shaft 13 passing through the arc-shaped slide groove 111, and the elastic connecting member 16 is connected to the fixing column 113. Specifically, the elastic connecting member 16 is an elastic band, and a clamping groove is provided on the fixing column 113 and the rotating shaft 13 respectively, and the elastic band surrounds the two clamping grooves. Of course, the elastic connecting member 16 can also be a spring.

[0040] In this embodiment, for ease of installation, the mounting plate 11 is stepped, the knob 12 and the driving gear 121, the arcuate slide groove 111, and the transmission gear 14 installed on the arcuate slide groove 111 are arranged on the same step surface, and the avoidance groove 112 is arranged on another step surface.

[0041] Depend on Figure 4 , Figure 5 and Figure 6It can be known 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 connected to the display assembly by transmission, usually, the threaded rod 41 is a rectangular thread for easy transmission, and a focus adjustment gear 42 is installed on the end of the threaded rod 41 located on the barrel assembly side; and also includes the above-mentioned knob adjustment mechanism, the transmission gear 14 of the knob adjustment mechanism is meshed with the 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.

[0042] The transmission gear 14 of the knob adjustment mechanism is meshed with the focus adjustment gear 42. The knob 12 is turned and the focus adjustment gear 42 is driven to rotate through the driving gear 121 and the transmission gear 14. The adjustment gear 42 is fixedly connected to the threaded rod 41. 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 lens barrel assembly The position of the lens barrel assembly changes, and the lens barrel assembly moves toward or away from the knob adjustment mechanism, and the distance between the transmission gear 14 and the focus adjustment gear 42 changes. Since an elastic connector 16 is provided between the mounting plate 11 portion in the axial direction of the arc-shaped slide groove 111 and the rotating shaft 13, the transmission gear 14 and the focus adjustment gear 42 always remain in meshing engagement under the elastic force of the elastic connector 16. The focus can still be adjusted after the position of the lens barrel assembly is adjusted, which solves the problem that the existing adjustment knob cannot be used for a dynamic connection structure and is very convenient to use.

[0043] In this embodiment, the lens barrel assembly and the display assembly are arranged in two groups at intervals, such as Figures 4 to 6 As shown in the figure, the lens barrel assembly 22a and the display assembly 23a, the lens barrel assembly 22b and the display assembly 23b, the above-mentioned knob adjustment mechanism is respectively provided at each group of lens barrel assemblies and display assemblies, and the knob adjustment mechanism is only shown on one side in the figure.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 .

[0052] 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 mounting plate 11 of the knob adjustment mechanism is fixed on 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 lens barrel assembly 22a and the lens barrel assembly 22b are provided with a plurality of knob adjustment mechanisms. The pupil distance adjustment structure includes a transmission shaft 31 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, passive wheels respectively arranged on the adjacent ends of the two transmission shafts 31, and a pupil distance adjustment wheel 34 meshed with the two passive wheels for driving the passive wheels to rotate. Threaded sleeves 32 sleeved on the transmission shaft 31 are respectively connected to the lens barrel assembly 22a and the lens barrel assembly 22b, and a threaded portion 33 threadedly connected to the threaded sleeve 32 is provided at a corresponding position on the transmission shaft 31. Usually, the pupil distance adjustment wheel 34 is rotatably connected to the housing through a support plate or a mounting shaft.

[0053] Since the two passive wheels are respectively mounted on the transmission shafts 31 on both sides, the two passive wheels can be driven to rotate in the opposite direction by rotating the pupil distance adjustment wheel 34, and the threaded sleeves 32 connected with the transmission shaft 31 threaded transmission are respectively provided on the lens barrel assembly 22a and the lens barrel assembly 22b, and 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, so as to achieve 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, because an elastic connecting member 16 is provided between the mounting plate 11 part and the rotating shaft 13 in the axial direction of the arc-shaped slide groove 111, the transmission gear 14 and the focal length adjustment gear 42 are always kept in meshing under the elastic force of the elastic connecting member 16, and the lens barrel assembly 22a and the lens barrel assembly 22b can still adjust the focal length through the knob adjustment mechanism on the corresponding side after the position adjustment, which solves the problem that the existing adjustment knob cannot be used in the dynamic connection structure, and is very convenient to use.

[0054] Specifically, the pupil distance adjustment wheel 34 is a crown gear, and the two driven wheels are spur gears. Of course, the pupil distance adjustment wheel 34 can also be a bevel gear, and the corresponding two driven wheels are also configured as bevel gears.

[0055] 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. Knob adjustment mechanism, characterized in that: The invention also comprises a mounting plate and a knob rotatably connected to a side surface of the mounting plate, wherein an arcuate slot concentric with the knob is provided on the mounting plate; the invention also comprises a transmission gear mounted on the arcuate slot via a rotating shaft and transmission-connected to the knob, and an elastic connecting member arranged between the mounting plate and the rotating shaft for tightening the rotating shaft, wherein one end of the elastic connecting member is fixed on the rotating shaft and the other end is fixed on a portion of the mounting plate in a radial direction of a middle portion of the arcuate slot; when a focus adjustment gear meshing with the transmission gear moves outward, the focus adjustment gear squeezes the transmission gear and pushes the transmission gear to slide along the arcuate slot, and the elastic force of the elastic connecting member keeps the transmission gear meshing with the focus adjustment gear; when the focus adjustment gear moves inward, the elastic force of the elastic connecting member makes the transmission gear slide along the arcuate slot, and keeps the transmission gear meshing with the focus adjustment gear.

2. The knob adjustment mechanism according to claim 1, characterized in that: A driving gear coaxially arranged therewith is fixedly connected to the side surface of the knob, and the driving gear is meshed with the transmission gear.

3. The knob adjustment mechanism according to claim 2, characterized in that: A retaining wall is provided at the side of the arc-shaped sliding groove, and a flexible ring sleeve is clamped on the retaining wall.

4. The knob adjustment mechanism according to claim 3, characterized in that: There is a gap between the inner wall of the retaining wall and the side of the arc-shaped slide groove; the flexible ring sleeve includes a main ring body and side plates respectively connected to the two side edges of the main ring body, and the two side plates are respectively inserted into the position between the inner wall of the retaining wall and the side of the arc-shaped slide groove.

5. The knob adjustment mechanism according to claim 2, characterized in that: Correspondingly, a fixing column is provided on the side surface of the mounting plate, and the elastic connecting member is connected to the fixing column.

6. The knob adjustment mechanism according to claim 5, characterized in that: The elastic connecting member is an elastic band, and slots are respectively provided on the fixing column and the rotating shaft, and the elastic band surrounds the two slots.

7. The knob adjustment mechanism according to any one of claims 2 to 6, characterized in that: An avoidance groove is provided on the mounting plate portion of the transmission gear away from the knob.

8. The knob adjustment mechanism according to claim 7, characterized in that: The mounting plate is in a step shape, the knob and the driving gear, the arc-shaped slide groove, and the transmission gear are arranged on the same step surface, and the avoidance groove is arranged on another step surface.

9. 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 8, the transmission gear of the knob adjustment mechanism is meshed with the focus adjustment gear.

10. The focus adjustment device according to claim 9, 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.

11. The focus adjustment device according to claim 10, 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.

12. The focus adjustment device according to claim 11, 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.

13. The focus adjustment device according to claim 12, 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.

14. The focus adjustment device according to claim 13, 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.

15. The focus adjustment device according to any one of claims 9 to 14, 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 the threaded rods.

16. A head-mounted device comprising a housing and a guide rod fixed in an area enclosed by the housing, characterized in that: It also includes the focus adjustment device as described in any one of claims 9 to 15, the lens barrel assembly is mounted on the guide rod and can slide along the guide rod, and the mounting plate of the knob adjustment mechanism is fixed on the housing.

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