Pupil distance adjusting device

Abstract

The utility model discloses an interpupillary distance adjusting device which comprises a middle frame, a lead screw is rotationally installed on the middle frame, a threaded part is arranged on the lead screw, a sliding block moving in the axial direction of the lead screw is installed on the threaded part, one end of the lead screw is in transmission connection with a driving device, and a limiting plate abutting against the other end of the lead screw is installed on the middle frame. A recess of which the depth direction is consistent with the axial direction of the screw rod is formed in the middle frame; the limiting plate is adjustably mounted in the recess and is in gapless abutting connection with the end part of the screw rod; the limiting plate is used for limiting the free end of the lead screw, the axial shaking amount of the lead screw can be freely adjusted, the axial length of the overall structure is reduced, parts of the overall structure are reduced, the axial space is saved, the structure is simpler, and more competitive in space use and cost is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent wearable devices, and in particular to a pupil distance adjustment device. Background Art

[0002] At present, in order to improve users' visual experience and virtual effects, head-mounted device manufacturers use interpupillary distance (IPD) adjustment devices to automatically adjust the interpupillary distance, which has fast response speed and high positioning accuracy.

[0003] However, existing IPD adjustment devices occupy a large axial space and use many parts to achieve the necessary adjustment performance, making it difficult to further miniaturize while ensuring performance. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pupil distance adjustment device.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a pupil distance adjustment device, comprising a middle frame, a screw rod is rotatably installed on the middle frame, a threaded portion is provided on the screw rod, a slider is installed on the threaded portion that moves along the axial direction of the screw rod, one end of the screw rod is transmission-connected to a driving device, and a limit plate is installed on the middle frame that abuts against the other end of the screw rod; a recess is provided on the middle frame with a depth direction consistent with the axial direction of the screw rod, and the limit plate is adjustably installed in the recess and abuts against the end of the screw rod without a gap.

[0006] Preferably, the driving device includes a driving motor, the driving motor is transmission-connected to a reduction device, and the reduction device is transmission-connected to the screw rod.

[0007] Preferably, the drive motor is fixedly mounted on the middle frame.

[0008] Preferably, the deceleration device includes a reduction gear box, in which a planetary gear set is installed, the power input end of the planetary gear set is transmission-connected to the power output end of the drive motor, and the power output end of the planetary gear set is transmission-connected to the screw.

[0009] Preferably, the reduction gear box body and the middle frame are integrally formed.

[0010] Preferably, a connecting ring for limiting and encapsulating the planetary gear set is installed at the open end of the reduction gear box body, the connecting ring is fixedly connected to the middle frame, and the power output end of the drive motor passes through the connecting ring and is transmission-connected to the planetary gear set.

[0011] Preferably, the screw rod is provided with two threaded portions with opposite thread directions, and each of the threaded portions is mounted with a slider.

[0012] Preferably, the end of the screw rod resting on the limit plate is designed to be arc-shaped;

[0013] And / or, the limiting plate is made of metal.

[0014] Preferably, a rotating bearing is installed between one end of the screw rod close to the limiting plate and the middle frame.

[0015] Preferably, a plurality of convex ribs for clamping the limiting plate are provided on the inner wall of the recess, and adhesive is filled between the limiting plate and the inner wall of the recess.

[0016] Preferably, a guide rod arranged parallel to the screw rod is further mounted on the middle frame, and the slider is slidably mounted on the guide rod.

[0017] Preferably, one end of the guide rod extends from the middle frame and abuts against the limit plate, the limit plate is provided with a notch, one end of the guide rod is at least partially exposed to the notch, and the notch is filled with adhesive that fixes the end of the guide rod to the middle frame.

[0018] The beneficial effects of this application are:

[0019] The interpupillary distance adjustment device described in the present application includes a middle frame, on which a screw is rotatably installed, and a threaded portion is provided on the screw, and a slider is installed on the threaded portion that moves along the axial direction of the screw, and one end of the screw is connected to a driving device for transmission, and a limit plate is installed on the middle frame, which abuts against the other end of the screw; a recess is provided on the middle frame, and the depth direction is consistent with the axial direction of the screw, and the limit plate is adjustably installed in the recess and abuts against the end of the screw without a gap; the limit plate is used to limit the free end of the screw, and the axial shaking amount of the screw can be freely adjusted, thereby reducing the axial length of the overall structure, reducing the components of the overall structure, saving axial space, and making the structure simpler and more competitive in terms of space usage and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0021] Figure 1 It is an exploded view of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the embodiment of the utility model Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the structure of the embodiment of the utility model Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the structure of the embodiment of the utility model Figure 3 ;

[0025] Figure 5 This is a schematic diagram of the structure of the embodiment of the utility model Figure 4 ;

[0026] Figure 6 This is a partial cross-sectional view of an embodiment of the present invention Figure 1 ;

[0027] Figure 7 This is a partial cross-sectional view of an embodiment of the present invention Figure 2 ;

[0028] In the figure: 1-middle frame; 21-screw rod; 22-slider; 31-limiting plate; 32-convex rib; 41-driving motor; 42-reduction gearbox; 43-planetary gear set; 44-connecting ring; 51-limiting bearing; 52-rotating bearing; 61-guide rod; 62-notch; 7-depression. DETAILED DESCRIPTION

[0029] The present invention is further described below with reference to the accompanying drawings and examples. In the detailed description that follows, certain exemplary embodiments of the present invention are described by way of illustration only. It goes without saying that those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims.

[0030] like Figures 1 to 5 As shown, a pupillary distance adjustment device includes a middle frame 1, on which a screw 21 is rotatably mounted. The screw 21 is provided with a threaded portion, and the threaded portion is mounted with a slider 22 that moves axially along the screw 21. One end of the screw 21 is transmission-connected to a drive device, and the middle frame 1 is mounted with a limit plate 31 that abuts the other end of the screw 21. The middle frame 1 is provided with a recess 7 whose depth direction is consistent with the axial direction of the screw 21. The limit plate 31 is adjustably mounted in the recess 7 and abuts the end of the screw 21 without gap.

[0031] In the prior art, the limit plate 31 is generally connected to the middle frame by connecting bolts. The position of the limit plate 31 is fixed and cannot be adaptively adjusted according to the length of the screw rod 21. The length of the screw rod 21 cannot be accurately and error-free during the production process. Once the length of the screw rod 21 extending from the middle frame 1 into the recessed area 7 is greater than the theoretical design length, the pressure of the screw rod 21 against the limit plate 31 will be too large. During the rotation of the screw rod 21, the limit plate 31 will cause friction resistance to the rotation of the screw rod 21, generating noise. The screw rod 21 will also cause extrusion damage to the limit plate 31, affecting its service life. In this technical solution, if Figure 6 and Figure 7 As shown, the installation position of the limit plate 31 in the recess 7 can be adjusted along the axial direction of the screw rod 21. During assembly, the installation position of the limit plate 31 in the recess 7 can be adjusted according to the position of the screw rod 21. That is, the limit plate 31 has the freedom to adjust along the axial direction of the screw rod 21 in the depth direction of the recess 7. This can avoid excessive squeeze fit between the screw rod 21 and the limit plate 31, reduce friction noise, and extend service life.

[0032] Furthermore, the drive device includes a drive motor 41, which is transmission-connected to a reduction gear, and the reduction gear is transmission-connected to the screw 21. The drive motor 41 is fixedly mounted on the middle frame 1. The reduction gear includes a reduction housing 42, in which a planetary gear set 43 is installed. The power input end of the planetary gear set 43 is transmission-connected to the power output end of the drive motor 41, and the power output end of the planetary gear set 43 is transmission-connected to the screw 21. The structure and working principle of the planetary gear set 43 belong to the prior art and will not be repeated here. The reduction gear has the function of amplifying torque.

[0033] Furthermore, the reduction gearbox 42 and the middle frame 1 are integrally formed. A cavity with an open end is provided on the middle frame 1, serving as the reduction gearbox 42. One end of the screw rod 21 extends into the reduction gearbox 42 and is transmission-connected to the planetary gear set 43. The open end of the cavity serves as the open end of the reduction gearbox. A connecting ring 44 is mounted on the open end of the reduction gearbox 42 to limit and encapsulate the planetary gear set 43. The connecting ring 44 is fixedly connected to the middle frame 1. The power output end of the drive motor 41 passes through the connecting ring 44 and is transmission-connected to the planetary gear set 43. In other words, both the connecting ring 44 and the drive motor 41 are fixedly connected to the middle frame 1.

[0034] Furthermore, the screw rod 21 is provided with two threaded portions with opposite thread directions, and each threaded portion is installed with a slider 22. Each slider 22 is connected to a lens barrel. When the slider 22 slides on the screw rod 21, it drives the lens barrel to move along the axial direction of the screw rod 21.

[0035] Furthermore, the limit plate 31 serves as a limit device for the free end of the screw rod 21. The drive end of the screw rod 21 connected to the drive device is also equipped with a drive end limit device. The drive end limit device includes a limit bearing 51 fixedly mounted on the middle frame 1. One end of the screw rod 21 passes through the limit bearing 51 and is transmission-connected to the drive device. The stepped surface of the threaded portion of the screw rod 21 abuts against the limit bearing 51. The end of the screw rod 21 that abuts against the limit plate 31 is designed to be circular arc-shaped, that is, the end of the screw rod 21 forms a spherical surface. The limit plate 31 is made of metal.

[0036] A rotation bearing 52 is installed between the end of the screw rod 21 near the limit plate 31 and the middle frame 1. That is, both ends of the screw rod 21 are connected to the middle frame 1 via the limit bearing 51 and the rotation bearing 52, respectively. The limit bearing 51 not only facilitates the rotation of the screw rod, but also serves to limit the axial position of the screw rod.

[0037] Furthermore, a plurality of ribs 32 for engaging the limiting plate 31 are provided on the inner wall of the recess 7, and adhesive is filled between the limiting plate 31 and the inner wall of the recess 7; the limiting plate 31 is easily interference-fitted with the ribs 32, and the ribs 32 pre-fix the limiting plate 31; specifically, the shapes of the recess 7 and the limiting plate 31 match, and can be designed into a circular, elliptical, or teardrop-shaped shape as needed. The number of ribs 32 is set as needed, and the ribs 32 are integrally formed with the inner wall of the recess 7. The distribution of the ribs 32 adopts the principle of symmetry. For a circular limiting plate 31, the ribs 32 are uniformly distributed circumferentially, which is the best state; for an elliptical limiting plate 31, the ribs 32 are symmetrically distributed along the long axis of the limiting plate 31; for a teardrop-shaped limiting plate 31, the ribs 32 are also symmetrically arranged along the central symmetry axis of the limiting plate 31. The limiting plate 31 is clamped in the recess 7 of the middle frame 1 by cooperating with the rib 32 and is filled with adhesive, so the installation is simple.

[0038] Compared with the traditional screw-fixed limit plate 31, the position of the limit plate 31 of the utility model can be adjusted along the axial direction of the screw rod 21 during installation to maintain the limit contact with the end of the screw rod 21, thereby reducing the extrusion force of the limit plate 31 on the screw rod 21 in the axial direction, thereby reducing the movement gap and reducing the friction of the screw rod 21 during rotation.

[0039] Furthermore, a guide rod 61 arranged parallel to the screw rod 21 is mounted on the middle frame 1 , and the slider 22 is slidably mounted on the guide rod 61 .

[0040] Furthermore, one end of the guide rod 61 extends from the middle frame 1 and rests on the limit plate 31. A notch 62 is provided on the limit plate 31. One end of the guide rod 62 is at least partially exposed to the notch 62. The notch 62 is filled with adhesive that fixes the end of the guide rod 61 to the middle frame 1.

[0041] The axial limit of the screw rod 21 adopts a metal limit plate 31, and there are ribs 32 around the contact area with the metal limit plate 31 to serve as a pre-fixation; first, the limit plate 31 presses the rib 32 and contacts the spherical end of the screw rod 21, and then glue is applied around the limit plate 31 or other methods are used to fix it to the middle frame 1; a notch 62 is provided at one end of the limit plate 31, the purpose of which is to allow the guide rod 61 and the middle frame 1 to be bonded together, thereby increasing the strength of the middle frame 1.

[0042] By adopting the connection mode of clamping the metal limit plate 31 with the rib 32, the axial shaking amount of the screw rod 21 can be freely adjusted, which reduces the axial space and the number of required parts, and is more competitive in terms of space usage and cost.

[0043] The driving motor 41 and the connecting ring 44 are both fixed to the middle frame 1, the reduction gear box 42 and the middle frame 1 are integrally formed, and the planetary gear set 43 is installed in the box; one end of the screw rod 21 is limited by the limit bearing 51 installed on the middle frame 1, and the other end passes through the rotating bearing 52 and is limited by the metal limit plate 31; the end of the screw rod 21 that contacts the metal limit plate 31 is designed with a spherical surface, which can reduce friction and improve efficiency during rotation; the two sliders 22 are symmetrically distributed on the screw rod 21 with threaded fittings, and the two ends of the guide rod 61 are fixedly connected to the middle frame 1 to serve as positioning guides and enhance the strength of the middle frame 1.

[0044] Working principle: After receiving the driving signal, the driving motor 41 outputs power; the reduction device receives the power of the driving motor 41, and realizes the effect of increasing the output torque through the reduction of the planetary gear set 43; the screw rod 21 receives the power output by the planetary gear set 43, and the rotation of the screw rod 21 drives the two sliders 22 to move away from each other or move toward the middle, and the slider 22 drives the lens barrel to move.

[0045] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A pupil distance adjustment device, comprising a middle frame, characterized in that: The middle frame is rotatably mounted with a screw rod, the screw rod is provided with a threaded portion, the threaded portion is mounted with a slider that moves along the axial direction of the screw rod, one end of the screw rod is transmission-connected to a driving device, and the middle frame is mounted with a limit plate that abuts against the other end of the screw rod; The middle frame is provided with a recess whose depth direction is consistent with the axial direction of the screw rod. The limit plate is adjustably installed in the recess and is abutted against the end of the screw rod without a gap.

2. The pupil distance adjustment device according to claim 1, characterized in that: The driving device includes a driving motor, the driving motor is transmission-connected with a reduction device, and the reduction device is transmission-connected with the screw rod.

3. The pupil distance adjustment device according to claim 2, characterized in that: The driving motor is fixedly mounted on the middle frame.

4. The interpupillary distance adjustment device according to claim 2, characterized in that: The deceleration device includes a reduction gear box body, a planetary gear set is installed in the reduction gear box body, the power input end of the planetary gear set is transmission-connected to the power output end of the drive motor, and the power output end of the planetary gear set is transmission-connected to the screw.

5. The interpupillary distance adjustment device according to claim 4, characterized in that: The reduction gearbox body and the middle frame are integrally formed.

6. The interpupillary distance adjustment device according to claim 5, characterized in that: A connecting ring for limiting and encapsulating the planetary gear set is installed at the open end of the reduction gear box body. The connecting ring is fixedly connected to the middle frame. The power output end of the drive motor passes through the connecting ring and is transmission-connected to the planetary gear set.

7. The interpupillary distance adjustment device according to claim 1, characterized in that: The screw rod is provided with two threaded parts with opposite thread directions, and each of the threaded parts is equipped with a slider.

8. The interpupillary distance adjustment device according to claim 1, characterized in that: The end of the screw rod resting on the limit plate is designed to be arc-shaped; And / or, the limiting plate is made of metal.

9. The interpupillary distance adjustment device according to claim 1, characterized in that: A rotating bearing is installed between one end of the screw rod close to the limiting plate and the middle frame.

10. The interpupillary distance adjustment device according to claim 1, characterized in that: A plurality of convex ribs for clamping the limiting plate are provided on the inner wall of the recess, and adhesive is filled between the limiting plate and the inner wall of the recess.

11. The interpupillary distance adjustment device according to any one of claims 1 to 10, characterized in that: A guide rod arranged parallel to the screw rod is also installed on the middle frame, and the sliding block is slidably installed on the guide rod.

12. The pupil distance adjustment device according to claim 11, characterized in that: One end of the guide rod extends from the middle frame and abuts against the limit plate. A notch is provided on the limit plate. One end of the guide rod is at least partially exposed to the notch. The notch is filled with adhesive that fixes the end of the guide rod to the middle frame.

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