Pupil distance adjusting device

Abstract

This utility model discloses an interpupillary distance adjustment device, including a middle frame, a lead screw, a motor, and a transmission device. The lead screw is rotatably mounted inside the middle frame. The lead screw has two threaded sections and a connecting section between the two threaded sections. A slider is screwed onto each threaded section. The transmission device includes a first gear, which is integrally injection molded with the connecting section. The motor drives the transmission device to rotate the lead screw. The movement of the slider is controlled by the lead screw, and the slider drives the lens barrel assembly connected to it to move, thereby realizing the adjustment of the interpupillary distance. The adjustment process is precise and fast. The transmission device is connected to the connecting section between the lead screw and the transmission device, which effectively reduces the overall axial length of the device, making the overall structure of the device reasonable and compact, and improving the flexibility of the overall assembly.

Description

Technical Field

[0001] This utility model relates to the field of smart wearable device technology, and in particular to an interpupillary distance adjustment device. Background Technology

[0002] To enhance the user's visual experience and virtual effects, head-mounted devices need to automatically adjust the interpupillary distance (IPD) using an IPD adjustment device. This adjustment method is characterized by fast response speed and high positioning accuracy, and is widely used.

[0003] In the existing technology, the module motor and gearbox of the interpupillary distance (IPD) adjustment device adopt an offset design, which occupies a large axial space. In order to achieve a precise and fast adjustment effect, the IPD adjustment device uses a lot of parts. Although the adjustment performance is guaranteed, it is difficult to further miniaturize the device structure and lacks flexibility in the process of adapting the whole machine.

[0004] In the prior art, the interpupillary distance (IPD) adjustment device includes two lead screws and a gear that drives the two lead screws to rotate. The gear has mounting holes on both sides that match the lead screws. The two lead screws are connected to the mounting holes on both sides of the gear. This structure results in a large number of parts in the interpupillary distance (IPD) adjustment device and a complex assembly process. The two lead screws and the connection nodes between the gear and the lead screws on both sides result in low axial strength after assembly, which affects the service life. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an interpupillary distance adjustment device that, while ensuring accurate and rapid adjustment, can achieve a miniaturized structure and improve the flexibility of overall device adaptation.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: an interpupillary distance adjustment device, including a middle frame, a lead screw, a motor and a transmission device, wherein the lead screw is rotatably installed in the middle frame, and the lead screw is provided with two threaded sections and a connecting section between the two threaded sections, and a slider is screwed onto each threaded section;

[0007] The transmission device includes a first gear, which is integrally injection molded with the connecting section. The motor drives the transmission device to rotate the lead screw.

[0008] Preferably, the threads of the two threaded segments rotate in opposite directions.

[0009] Preferably, at least one radially extending protrusion is provided on the inner wall of the through hole connecting the first gear and the lead screw, and a recessed portion that mates with the protrusion is provided on the outer wall of the lead screw;

[0010] Alternatively, at least one radially extending recess is provided on the inner wall of the through hole connecting the first gear and the lead screw, and a protrusion that mates with the recess is provided on the outer wall of the lead screw.

[0011] Preferably, the power output shaft of the motor is arranged parallel to the lead screw, and the transmission device further includes a second gear fixedly connected to the power output shaft;

[0012] The first gear and the second gear mesh, or a transmission gear is provided between the first gear and the second gear, and the second gear drives the first gear to rotate through the transmission gear.

[0013] Preferably, the power output shaft of the motor is arranged perpendicularly to the lead screw, and the transmission device further includes a second gear and a steering gear. The second gear is fixedly connected to the power output shaft, and the steering gear is respectively meshed with the first gear and the second gear.

[0014] Preferably, the steering gear includes a third gear and a fourth gear that are coaxially arranged and fixedly connected, wherein the third gear meshes with the second gear for transmission, and the fourth gear meshes with the first gear for transmission.

[0015] Preferably, the second gear and the third gear are a bevel gear set;

[0016] Alternatively, the third gear may be an end gear, which meshes with the second gear for transmission.

[0017] Preferably, the two ends of the middle frame are provided with rotating bearings and limiting plates, and the two ends of the lead screw pass through the rotating bearings and abut against the limiting plates.

[0018] Preferably, the middle frame is provided with a recess whose depth direction is consistent with the axial direction of the lead screw, and the limiting plate is adjustablely installed in the recess, and the limiting plate is abutted against the end of the lead screw without gap.

[0019] Preferably, a guide rod is also installed on the middle frame, which is parallel to the lead screw, and the slider is slidably mounted on the guide rod.

[0020] The beneficial effects of this application are as follows:

[0021] The pupillary distance adjustment device described in this application includes a middle frame, a lead screw, a motor, and a transmission device. The lead screw is rotatably mounted inside the middle frame. The lead screw has two threaded sections and a connecting section between the two threaded sections. A slider is screwed onto each threaded section. The transmission device includes a first gear, which is integrally injection molded with the connecting section. The motor drives the transmission device to rotate the lead screw. The movement of the slider is controlled by the lead screw, and the slider drives the lens barrel assembly connected to it to move, thereby realizing the adjustment of the pupillary distance. The adjustment process is precise and fast. The transmission device is connected to the connecting section in the middle of the lead screw, which effectively reduces the overall axial length of the device, making the overall structure of the device reasonable and compact, and improving the flexibility of the overall assembly. Attached Figure Description

[0022] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0025] Figure 3 This is an exploded view of an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of one embodiment of the motor and transmission device of this utility model;

[0027] Figure 5 This is a schematic diagram of another embodiment of the motor and transmission device of this utility model;

[0028] Figure 6 This is a cross-sectional view showing the connection relationship between the lead screw and the first gear in an embodiment of this utility model;

[0029] In the diagram: 1-Middle frame; 2-Lead screw; 3-Slider; 41-Seat; 42-Motor; 51-Second gear; 52-First gear; 53-Third gear; 54-Fourth gear; 6-Limiting plate; 7-Guide rod; 8-Rotating bearing. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, an interpupillary distance adjustment device includes a middle frame 1, a lead screw 2, a motor 42 and a transmission device. The lead screw 2 is rotatably installed inside the middle frame 1. The lead screw 2 is provided with two threaded sections and a connecting section between the two threaded sections. Each threaded section is screwed with a slider 3.

[0032] like Figure 6 As shown, the transmission device includes a first gear 52, which is integrally injection molded with the connecting section, greatly reducing the assembly difficulty of the module; the motor 42 drives the transmission device to drive the lead screw 2 to rotate.

[0033] The motor 42 and the transmission device control the movement of the slider 3 via the lead screw 2. The slider 3 drives the lens barrel assembly connected to it to move, thereby achieving the adjustment of the interpupillary distance. The adjustment process is precise and fast. The transmission device is connected to the lead screw 2 via a transmission section, which effectively reduces the overall axial length of the device, making the overall structure of the adjustment device reasonable and compact, and improving the flexibility of the whole machine assembly. Furthermore, the middle frame 1 adopts a symmetrical structure, and the motor and transmission device are preferably installed in the center of the middle frame 1.

[0034] The connection between the first gear 52 and the lead screw 2 is made by injection molding. The lead screw 2 is placed on the injection mold and the first gear 52 is directly injection molded on the lead screw 2. This process can ensure that the lead screw 2 is a one-piece structure without the need for separation in the middle. The lead screw 2 is embedded in the first gear 52, resulting in high overall strength and long service life. Moreover, it saves the assembly steps between the first gear 52 and the lead screw 2 and improves assembly efficiency.

[0035] Furthermore, the two threaded segments rotate in opposite directions. That is, the two threaded segments are symmetrically arranged. When the lead screw 2 rotates, it drives the two sliders 3 to move towards each other or away from each other. The two sliders move in opposite directions, realizing the convergence adjustment action or the separation adjustment action. Two sets of symmetrical threaded segments are machined on one lead screw 2 to achieve synchronous movement of the sliders 3, reducing material consumption and lowering module costs.

[0036] In one specific embodiment, at least one radially extending protrusion is provided on the inner wall of the through hole connecting the first gear 52 and the lead screw 2, and a recessed portion that mates with the protrusion is provided on the outer wall of the lead screw 2; alternatively, at least one radially extending recessed portion is provided on the inner wall of the through hole connecting the first gear 52 and the lead screw 2, and a protrusion that mates with the recessed portion is provided on the outer wall of the lead screw 2. The protrusions and recesses are arranged in pairs, and the number of protrusions and recesses can be set to one pair, two pairs, or more as needed by the customer. The protrusions and recesses work together to prevent relative rotation between the lead screw 2 and the first gear 52, ensuring that they operate synchronously.

[0037] When multiple recesses or protrusions are provided on the outer wall of the connecting section of the lead screw 2, the recesses or protrusions are preferably evenly distributed axially.

[0038] In one specific embodiment, the device also includes a base 41 integrally formed with the middle frame 1. A motor 42 is installed inside the base 41, and the motor 42 is connected to the lead screw 2 via a transmission device. The torque of the motor 42 is transmitted to the lead screw 2 through the transmission device, thereby driving the lead screw 2 to rotate. The motor 42 provides power to the interpupillary distance adjustment device. The arrangement of the motor 42 and the transmission device is the basis for achieving a precise and rapid adjustment effect.

[0039] In one specific embodiment, the power output shaft of the motor 42 is arranged parallel to the lead screw 2. The transmission device further includes a second gear 51 fixedly connected to the power output shaft. The first gear 52 and the second gear 51 mesh, or a transmission gear is provided between the first gear 52 and the second gear 51, and the second gear 51 drives the first gear 52 to rotate through the transmission gear. The output torque of the motor 42 is in the same direction as the rotational torque of the lead screw 2. The torque of the motor 42 is transmitted to the lead screw 2 through the gear, thereby controlling the rotation of the lead screw 2. The rotation of the lead screw 2 drives the two sliders 3 to move. The fact that the output torque of the motor 42 and the rotational torque of the lead screw 2 are arranged in the same direction makes the transmission device between the motor 42 and the lead screw 2 simple in structure, small in size, and occupies little space, providing a basis for structural miniaturization.

[0040] In one specific embodiment, the power output shaft of the motor 42 is perpendicular to the lead screw 2. The transmission device further includes a second gear 51 and a steering gear. The second gear 51 is fixedly connected to the power output shaft, and the steering gear meshes with both the first gear 52 and the second gear 51. The motor 42 is fixed to the middle frame 1 and transmits torque to the lead screw 2 through the transmission device. Since the output torque direction of the motor is perpendicular to the rotation direction of the lead screw 2, a steering gear is used to change the output direction of the torque. According to the structural layout, the central axis of the second gear 51 is perpendicular to the central axis of the first gear 52, so the second gear 51 and the first gear 52 cannot directly transmit torque. The steering gear can effectively transmit the torque of the second gear 51 to the first gear 52, thereby driving the lead screw 2 to rotate.

[0041] Furthermore, the steering gear includes a third gear 53 and a fourth gear 54 coaxially arranged and fixedly connected. The third gear 53 meshes with the second gear 51 for transmission, and the fourth gear 54 meshes with the first gear 52 for transmission. Driven by the second gear 51, the third gear 53 and the fourth gear 54 can rotate synchronously, thereby driving the first gear 52 to work, realizing the transmission of torque from the motor to the lead screw 2. The four gears cooperate with each other to ensure the smooth transmission of torque and achieve the purpose of precise and rapid adjustment.

[0042] As one specific implementation method, such as Figure 4 As shown, the second gear 51 and the third gear 53 are bevel gear sets, which have the function of changing the direction of torque.

[0043] Or, such as Figure 3 and Figure 5 As shown, the third gear 53 is an end gear, which meshes with the second gear 51 for transmission. The torque of the second gear 51 changes direction after being transmitted through the end gear. The end gear then transmits the changed torque to the first gear 52 through the synchronously rotating fourth gear 54, thereby driving the lead screw 2 to rotate.

[0044] In one specific embodiment, the two ends of the middle frame 1 are provided with rotating bearings 8 and limiting plates 6. The two ends of the lead screw 2 pass through the rotating bearings 8 and abut against the limiting plates 6. The limiting plates 6 can restrict the axial movement freedom of the lead screw 2, preventing axial displacement during the operation of the lead screw 2 and avoiding interpupillary distance adjustment errors. The plate-shaped limiting device occupies little axial space, effectively reducing the axial length and achieving the purpose of structural miniaturization. Under the action of the rotating bearings 8, the friction between the lead screw 2 and the middle frame 1 can be reduced, reducing the rotational resistance of the lead screw 2 and making the rotation of the lead screw 2 smoother. Furthermore, the middle frame 1 is provided with a recess whose depth direction is consistent with the axial direction of the lead screw 2. The limiting plates 6 are adjustablely installed in the recess, and the limiting plates 6 are abutted against the ends of the lead screw 2 without gap. The limiting plates 6 can be glued to the recess area, which is not only easy to assemble, but also has a compact and beautiful structure.

[0045] In one specific embodiment, a guide rod 7, parallel to the lead screw 2, is also installed on the middle frame 1, and the slider 3 is slidably mounted on the guide rod 7. The guide rod 7 ensures that the slider 3 does not swing during movement, and also guides the slider 3. The guide rod 7 also enhances the strength of the middle frame 1.

[0046] This pupillary distance adjustment device shortens the overall axial length of the device by changing the position of the motor and transmission device, making the structure of the device more compact and improving the flexibility of its assembly with the whole machine. The centrally located motor 42 uses the mutual cooperation of the gears in the transmission device to transmit the output torque of the motor 42 to the lead screw 2. The rotation of the lead screw 2 drives the slider 3 to move, thereby driving the lens barrel assembly connected to the slider 3 to move, thus realizing the adjustment of pupillary distance. The adjustment process is precise and fast, and the torque transmission process is smooth.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pupillary distance adjustment device, comprising a middle frame, a lead screw, a motor, and a transmission device, wherein the lead screw is rotatably mounted within the middle frame, characterized in that: The lead screw is provided with two threaded sections and a connecting section between the two threaded sections, and a slider is screwed onto each threaded section; The transmission device includes a first gear, which is integrally injection molded with the connecting section. The motor drives the transmission device to rotate the lead screw.

2. The interpupillary distance adjustment device according to claim 1, characterized in that: The threads of the two threaded segments rotate in opposite directions.

3. The interpupillary distance adjustment device according to claim 1, characterized in that: At least one radially extending protrusion is provided on the inner wall of the through hole connecting the first gear and the lead screw, and a recessed portion that mates with the protrusion is provided on the outer wall of the lead screw; Alternatively, at least one radially extending recess is provided on the inner wall of the through hole connecting the first gear and the lead screw, and a protrusion that mates with the recess is provided on the outer wall of the lead screw.

4. The interpupillary distance adjustment device according to claim 1, characterized in that: The power output shaft of the motor is arranged parallel to the lead screw, and the transmission device further includes a second gear fixedly connected to the power output shaft; The first gear and the second gear mesh, or a transmission gear is provided between the first gear and the second gear, and the second gear drives the first gear to rotate through the transmission gear.

5. The interpupillary distance adjustment device according to claim 1, characterized in that: The power output shaft of the motor is arranged perpendicularly to the lead screw. The transmission device also includes a second gear and a steering gear. The second gear is fixedly connected to the power output shaft, and the steering gear is meshed with the first gear and the second gear respectively.

6. The interpupillary distance adjustment device according to claim 5, characterized in that: The steering gear includes a third gear and a fourth gear that are coaxially arranged and fixedly connected. The third gear meshes with the second gear for transmission, and the fourth gear meshes with the first gear for transmission.

7. The interpupillary distance adjustment device according to claim 6, characterized in that: The second gear and the third gear are a bevel gear set; Alternatively, the third gear may be an end gear, which meshes with the second gear for transmission.

8. The interpupillary distance adjustment device according to claim 1, characterized in that: The two ends of the middle frame are provided with rotating bearings and limiting plates, and the two ends of the lead screw pass through the rotating bearings and abut against the limiting plates.

9. The interpupillary distance adjustment device according to claim 8, characterized in that: The middle frame is provided with a recess whose depth direction is consistent with the axial direction of the lead screw. The limiting plate is adjustablely installed in the recess, and the limiting plate is abutted against the end of the lead screw without gap.

10. The interpupillary distance adjustment device according to any one of claims 1 to 9, characterized in that: A guide rod is also installed on the middle frame, which is parallel to the lead screw, and the slider is slidably mounted on the guide rod.

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