WO2020082594A1

WO2020082594A1 - Head-mounted display device and focal length adjustment device thereof

Info

Publication number: WO2020082594A1
Application number: PCT/CN2018/124601
Authority: WO
Inventors: 张立龙
Original assignee: 歌尔股份有限公司
Priority date: 2018-10-26
Filing date: 2018-12-28
Publication date: 2020-04-30
Also published as: CN109143588A; CN109143588B

Abstract

A head-mounted display device and a focal length adjustment device thereof, comprising a first shaft (1), a second shaft (2), a first transmission shaft (3) and a second transmission shaft (4). The first transmission shaft and the second transmission shaft are respectively in threaded connection to lens barrels (14) at left and right sides; the first shaft, when rotated, drives the first transmission shaft to rotate, so as to allow the lens barrel in threaded connection to the first transmission shaft to move forward and back relative to a display screen (15), thus adjusting the focal length; the second shaft, when rotated, drives the second transmission shaft to rotate, so as to allow the lens barrel (14) in threaded connection to the second transmission shaft to move forward and back relative to the display screen (15), thereby adjusting the focal length; and the first shaft and the second shaft may move relative to each other so as to connect to each other and thus rotate synchronously or separately, thus rotating independently. The present device may adjust the focal length according to the shortsightedness of the eyes of a customer, may adjust left and right focal lengths respectively according to the differences in shortsightedness of the left and right eyes of a user, and may adjust the left and right focal lengths at the same time. The device is convenient, quick and highly efficient, and space is saved and adjustment is made convenient by means of screw thread conduction motion.

Description

Head-mounted display device and its focal length adjusting device

This application requires the priority of the Chinese patent application filed on October 26, 2018 in the Chinese Patent Office, with the application number 201811257422.1 and the invention titled "a head-mounted display device and its focal length adjustment device", the entire contents of which are incorporated by reference In this application.

Technical field

The present invention relates to the technical field of wearable devices, and more particularly, to a head-mounted display device, and also to a focal length adjustment device for a head-mounted display device.

Background technique

Head-mounted display devices can realize different effects such as virtual reality (VR), augmented reality (AR), mixed reality (MR) by sending optical signals to the eyes. Many head-mounted display device products on the market today cannot adjust the focal length, so myopia consumers or far-sighted consumers need to wear glasses to use them, which is very inconvenient, and the glasses lenses will rub the lenses of the head-mounted devices and are not comfortable to wear. Some products that can adjust the focal length cannot adjust the focal length according to the degree of myopia of the user's left and right eyes, so the user's eyes are uncomfortable, or the picture is not clear, which seriously affects the product experience.

In summary, how to effectively solve the problems of inconvenience and poor comfort of wearing a head-mounted display device for near-sighted or far-sighted users is a problem that those skilled in the art need to solve at present.

Summary of the invention

In view of this, the first object of the present invention is to provide a focal length adjustment device for a head-mounted display device. The structural design of the focal length adjustment device can effectively solve the problems of inconvenience and poor comfort of wearing a head-mounted display device for near-sighted or far-sighted users The second object of the present invention is to provide a head-mounted display device including the above focal length adjusting device.

In order to achieve the above first object, the present invention provides the following technical solutions:

A focal length adjusting device for a head-mounted display device includes a first shaft, a second shaft, a first transmission shaft and a second transmission shaft for screw connection with left and right lens barrels, respectively, the first shaft When rotating, the first transmission shaft is rotated to adjust the distance between the corresponding lens barrel and the display screen, and when the second shaft is rotated, the second transmission shaft is rotated to adjust the distance from the corresponding lens barrel to the display screen, and The first shaft and the second shaft can be relatively moved to be connected to rotate synchronously or separate to rotate separately.

Preferably, in the above focal length adjusting device, the first shaft has a cylindrical shape, and the second shaft is sleeved in the first shaft and movable along the first shaft.

Preferably, in the above focal length adjusting device, a reset elastic member is provided between the first shaft and the second shaft to elastically deform when the first shaft moves relative to the second shaft.

Preferably, in the above focal length adjusting device, a first roller is fixedly connected to the outer end of the first shaft, and a second roller is fixedly connected to the outer end of the second shaft.

Preferably, in the above focal length adjusting device, the first roller and the second roller are disposed on the same side, and the first roller and the second roller are respectively provided with a matching first tooth surface and a first Two tooth surfaces, so that the first roller and the second roller are relatively moved in the axial direction until the first roller and the second roller are synchronized when the first tooth surface and the second tooth surface are engaged Turn.

Preferably, in the above focal length adjusting device, a mounting hole is opened on an outer end surface of the first roller, an inner end of the second roller is inserted into the mounting hole and can move along the mounting hole, and the first The inner surface of the two rollers has the second tooth surface, and the bottom surface of the mounting hole has the first tooth surface.

Preferably, the above focal length adjusting device further includes a locking member for locking the first shaft and the second shaft in a connected state.

Preferably, in the above focal length adjusting device, the locking member includes a buckle and an unlocking elastic member for pushing the buckle to reset, the inner end of the second shaft has a chuck, and the second shaft is opposite to the When the first shaft moves, the locking member is pressed to insert the chuck into the buckle for locking, and when the second shaft is pressed again, the unlocking elastic member pushes the buckle to lock the The chuck is released.

Preferably, in the above focal length adjusting device, a first bevel gear is fixed on the first shaft, and a third bevel gear meshing with the first bevel gear is fixedly connected to the end of the first transmission shaft; A second bevel gear is slidingly installed on the second shaft in the axial direction, and an end of the second transmission shaft is fixedly connected with a fourth bevel gear meshing with the second bevel gear.

The focus adjustment device provided by the present invention includes a first shaft, a second shaft, a first transmission shaft, and a second transmission shaft. Among them, the first transmission shaft and the second transmission shaft are respectively used for screw connection with the left and right lens barrels; when the first shaft rotates, the first transmission shaft is driven to rotate, which is opposite to the lens barrel screwed with the first transmission shaft The display screen moves back and forth to adjust the focal length; when the second shaft rotates, the second transmission shaft is driven to rotate, and the lens barrel threaded with the second transmission shaft moves forward and backward relative to the display screen to adjust the focal length; Move to connect to rotate synchronously or separate to rotate separately.

According to the focus adjustment device provided by the present invention, according to the degree of myopia or hyperopia of the left and right eyes of the consumer, the first shaft can be rotated independently, and the first shaft can drive the first transmission shaft to rotate, which in turn can drive the lens barrel threadedly connected to the first transmission shaft to oppose The display moves forward and backward to adjust the focus. Correspondingly, the second shaft can also be rotated separately, and the second shaft can drive the second transmission shaft to rotate, thereby driving the lens barrel screwed with the second transmission shaft to move forward and backward relative to the display screen, thereby adjusting the focal length. Alternatively, the first axis and the second axis can be connected by relative movement, so that one of the two can be rotated to realize the synchronous rotation of the two to simultaneously adjust the left and right focal lengths. In summary, the focal length adjustment device can adjust the focal length according to the degree of myopia of the consumer's eyes, and can adjust the left and right focal lengths separately according to the degree of myopia of the left and right eyes of the user, and can also adjust the left and right focal lengths at the same time, which is convenient and fast, and through the thread transmission movement High, space-saving and easy to adjust.

In order to achieve the above second object, the present invention also provides a head-mounted display device, the head-mounted display device including any one of the above focal length adjusting devices. Since the above focal length adjusting device has the above technical effects, the head-mounted display device having the focal length adjusting device should also have corresponding technical effects.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, without paying any creative labor, other drawings can be obtained based on these drawings.

1 is a schematic diagram of an explosion structure of a focal length adjustment device according to a specific embodiment of the present invention;

2 is a schematic cross-sectional structural view of a focal length adjusting device;

Figure 3 is a schematic diagram of the structure of the first roller;

4 is a schematic structural view of a second roller;

5 is a schematic diagram of an explosion structure of a locking component;

6 is a schematic diagram of the state of the locking member when the second shaft is not pressed;

7 is a schematic diagram of a state in which the locking member locks the second shaft;

8 is a schematic diagram of the rotating buckle in the locked state of the locking member;

9 is a schematic diagram of the cross-sectional structure of FIG. 8;

Fig. 10 is a schematic diagram of the inclined surface of the inner wall.

The marks in the drawings are as follows:

The first shaft 1, the second shaft 2, the first transmission shaft 3, the second transmission shaft 4, the first roller 5, the second roller 6, the return elastic member 7, the locking member 8, the first bevel gear 9, the second Bevel gear 10, third bevel gear 11, fourth bevel gear 12, guide shaft 13, lens barrel 14, display screen 15, front housing 16, rear housing 17, chuck 21, first tooth surface 51, second tooth surface 61, step surface 62, buckle 81, unlocking elastic member 82, rotating buckle 83, inner wall slope 84, rotating chuck 85.

detailed description

The embodiment of the invention discloses a focal length adjusting device for a head-mounted display device, which can conveniently and quickly adjust the left and right focal lengths, and can separately adjust the left and right focal lengths according to the degree of myopia of consumers' eyes.

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Please refer to FIGS. 1-2. FIG. 1 is a schematic diagram of an exploded structure of a focal length adjustment device according to an embodiment of the present invention. FIG. 2 is a schematic sectional view of the focal length adjustment device.

In a specific embodiment, the focus adjustment device provided by the present invention includes a first shaft 1, a second shaft 2, a first transmission shaft 3, and a second transmission shaft 4.

Among them, the first transmission shaft 3 and the second transmission shaft 4 are respectively used for screw connection with the left and right lens barrels 14. That is, the first transmission shaft 3 is screwed to the left lens barrel 14, the second transmission shaft 4 is screwed to the right lens barrel 14, or the first transmission shaft 3 is screwed to the right lens barrel 14, the second The transmission shaft 4 is screwed to the left lens barrel 14. 1-2 shows that the first transmission shaft 3 is screwed to the left lens barrel 14, that is, the first transmission shaft 3 is the left transmission shaft, then the first shaft 1 connected to the first transmission shaft 3 is Left shaft; the second transmission shaft 4 is screwed to the right lens barrel 14, that is, the second transmission shaft 4 is the right transmission shaft, and the second shaft 2 connected to the second transmission shaft 4 is the right shaft. According to actual needs, the corresponding relationship between the first transmission shaft 3 and the second transmission shaft 4 and the left and right lens barrels 14 in FIGS. 1-2 may also be interchanged.

When the first shaft 1 rotates, it drives the first transmission shaft 3 to rotate. Since the first transmission shaft 3 is screwed to the corresponding lens barrel 14, the lens barrel 14 connected to the first transmission shaft 3 can rotate along the first transmission shaft 3 Move back and forth relative to the display 15 to adjust the focus. Correspondingly, when the second shaft 2 rotates, the second transmission shaft 4 is driven to rotate, and then the lens barrel 14 screwed to the second transmission shaft 4 moves forward and backward relative to the display screen 15 to adjust the focal length. That is, the first transmission shaft 3 and the second transmission shaft 4 are respectively disposed along the distance between the left and right lens barrels 14 and the display screen 15, and both have external threads. In order to improve the stability of the movement of the lens barrel 14 along the transmission shaft, guide shafts 13 are provided parallel to the first transmission shaft 3 and the second transmission shaft 4, respectively, and each lens barrel 14 is provided with a through hole for the guide shaft 13 to pass through Therefore, when the lens barrel 14 moves forward and backward relative to the display screen 15, the guide shaft 13 can effectively guide and support, so that the movement of the lens barrel 14 is more stable. Preferably, the first transmission shaft 3 and the second transmission shaft 4 are respectively used for screw connection with the top end of the corresponding lens barrel 14, and the bottom end of each lens barrel 14 is provided with a guide shaft 13 respectively, which can The direction supports the lens barrel 14 and limits its moving direction, so that the movement of the lens barrel 14 is more stable.

The first shaft 1 and the second shaft 2 can be relatively moved to connect and rotate synchronously or separate and rotate separately. That is, the first shaft 1 and the second shaft 2 have two working states, one is connected to the synchronous rotation state, and the left and right focal lengths can be adjusted simultaneously by rotating one of the two. The other is to separate and rotate separately, you can rotate the two separately, and then adjust the left and right focal lengths separately to meet the needs of users with different focal lengths for the left and right eyes. The switching between the two working states of the first shaft 1 and the second shaft 2 is achieved by the relative movement of the first shaft 1 and the second shaft 2, as shown in FIG. 1-2, the first shaft 1 and the second shaft 2 are free When the state is the separated state, the first shaft 1 and the second shaft 2 move relative to each other, and the two are switched to the connected state. Or, if necessary, the free state of the first shaft 1 and the second shaft 2 may be set to the connected state, and then the first shaft 1 and the second shaft 2 move relative to each other to switch them to the separated state.

It should be noted that the relative movement of the first axis 1 and the second axis 2 may be fixed for the first axis 1, the second axis 2 may move relative to the first axis 1, or the second axis 2 may be fixed , The first axis 1 moves relative to the second axis 2, or both move and produce a relative displacement. The relative movement of the first shaft 1 and the second shaft 2 realizes the conversion between the left and right focal lengths and the simultaneous adjustment without the need for a separate transmission structure, and the structure of the overall focal length adjustment device is simpler and more compact.

According to the focus adjustment device provided by the present invention, according to the degree of myopia or hyperopia of the left and right eyes of the consumer, the first shaft 1 can be rotated independently, and the first shaft 1 can drive the first transmission shaft 3 to rotate, thereby driving the threaded connection with the first transmission shaft The lens barrel 14 moves forward and backward relative to the display screen 15 to adjust the side focal length. Correspondingly, the second shaft 2 can also be rotated separately, and the second shaft 2 drives the second transmission shaft 4 to rotate, and then drives the lens barrel 14 screwed to the second transmission shaft to move forward and backward relative to the display screen 15 to adjust the side focal length. Or, the first shaft 1 and the second shaft 2 can be connected by relative movement, so that one of the two can be rotated to realize the synchronous rotation of the two to simultaneously adjust the left and right focal lengths. In summary, the focal length adjustment device can adjust the focal length according to the degree of myopia of the consumer's eyes, and can adjust the left and right focal lengths separately according to the degree of myopia of the user's left and right eyes, and can also adjust the left and right focal lengths at the same time, which is convenient and fast, and through the thread transmission movement High efficiency, space saving and easy adjustment.

Preferably, the first shaft 1 is arranged perpendicular to the second transmission shaft 4 and the second shaft 2 is arranged perpendicular to the second transmission shaft 4. In order to facilitate the connection between the first shaft 1 and the second shaft 2 for synchronous rotation, the first shaft 1 Coaxially arranged with the second shaft 2, the structure is more compact. Of course, the first shaft 1 and the second shaft 2 are not limited to the above-mentioned setting manners, and can be set accordingly according to their specific structures.

Further, the first shaft 1 has a cylindrical shape, and the second shaft 2 is sleeved in the first shaft 1 and can move along the first shaft 1. That is, the first shaft 1 and the second shaft 2 are combined to save space. The movement of the second shaft 2 in the first shaft 1 makes it possible to separate the two shafts and rotate them simultaneously. It should be noted that the separation of the first shaft 1 and the second shaft 2 is not limited to the second shaft 2 coming out of the first shaft 1, but refers to releasing the connection between the first shaft 1 and the second shaft 2 so that the two It can be turned independently.

Furthermore, a reset elastic member 7 is provided between the first shaft 1 and the second shaft 2 to elastically deform when the first shaft 1 moves relative to the second shaft 2. That is, when the state of the first shaft 1 and the second shaft 2 needs to be switched, the external force acts to move the first shaft 1 and the second shaft 2 relatively, then the relative movement of the two causes the reset elastic member 7 to be deformed therebetween, thereby When the external force is released, the first shaft 1 and the second shaft 2 can return to a free state under the action of the reset elastic member 7. Taking the free state of the first shaft 1 and the second shaft 2 as the separated state as an example, that is, when the external force does not act, the first shaft 1 and the second shaft 2 can be separated and can be rotated separately. The two shafts 2 move relatively and deform the elastic member. As shown in Figure 1-2, push the second shaft 2 to the right to connect the first shaft 1 and the second shaft 2 to rotate synchronously, and compress and reset the elastic member 7 to act as an external force. When released, the reset elastic member 7 pushes the second shaft 2 to reset, and the first shaft 1 and the second shaft 2 return to the separated state. If necessary, the reset elastic member 7 may not be provided, and the free states of the first shaft 1 and the second shaft 2 can be manually restored during reset.

Specifically, the reset elastic member 7 may be a spring, and other conventional materials or structural members with elastic restoring force in the prior art may also be used as needed.

In order to facilitate the rotation of the first shaft 1 and the second shaft 2, a first roller 5 is fixedly connected to the outer end of the first shaft 1, and a second roller 6 is fixedly connected to the outer end of the second shaft 2. Furthermore, the user can manually rotate the first roller 5 to drive the first shaft 1 to rotate synchronously, and manually rotate the second roller 6 to drive the second shaft 2 to rotate synchronously. Preferably, the outer surfaces of the first roller 5 and the second roller 6 are textured, so as to increase the friction during user operation and facilitate rotation. The first roller 5 is preferably sleeved outside the first shaft 1, and the second roller 6 is preferably sleeved outside the second shaft 2. The first shaft 1 and the first roller 5 and the second shaft 2 and the second roller 6 can be fixedly connected by interference fit or the like, or as shown in FIGS. 1 and 2, the end of the second shaft 2 has a radial direction The connecting pin of the second roller 6 has a slot to cooperate with the connecting pin, so that when the second roller 6 rotates, it can drive the second shaft 2 to rotate synchronously.

Further, the first roller 5 and the second roller 6 are disposed on the same side. Please refer to FIGS. 3 and 4. FIG. 3 is a schematic structural view of the first roller 5; FIG. 4 is a structural schematic view of the second roller 6. By arranging the first roller 5 and the second roller 6 on the same side, as shown in the figure, they are arranged on the left side, which is convenient for the user to operate. When the second shaft 2 is sleeved in the first shaft 1 and the first roller 5 and the second roller 6 are arranged on the same side, the first roller 5 is sleeved outside the first shaft 1 and the second roller 6 It is sleeved outside the second shaft 2 and the second roller 6 is located outside the second roller 6.

Furthermore, the first roller 5 and the second roller 6 are respectively provided with a matching first tooth surface 51 and a second tooth surface 61, so that the first roller 5 and the second roller 6 relatively move in the axial direction to the first When the first tooth surface 51 meshes with the second tooth surface 61, the first roller 5 and the second roller 6 rotate synchronously. Specifically, the first roller 5 has a first tooth surface 51, the second roller 6 has a second tooth surface 61, and the first roller 5 and the second roller 6 move to the first tooth surface 51 and the second tooth in the axial direction When the surface 61 meshes, that is, the first shaft 1 and the second shaft 2 are connected by the meshing of the first tooth surface 51 and the second tooth surface 61, the first roller 5 and the second roller 6 rotate synchronously while making the first The axis 1 and the second axis 2 rotate synchronously. When the first roller 5 and the second roller 6 move in the axial direction until the first tooth surface 51 and the second tooth surface 61 are separated, that is, the first shaft 1 and the second shaft 2 are separated, the first roller 5 and the second The two rollers 6 rotate independently, and then the first shaft 1 and the second shaft 2 rotate independently. The synchronous rotation of the first shaft 1 and the second shaft 2 is achieved by the first tooth surface 51 meshing with the second tooth surface 61, the structure is simple and reliable, and the space can be fully utilized. If necessary, other connection methods can also be used to achieve the synchronous rotation of the first shaft 1 and the second shaft 2. If the first shaft 1 moves relative to the second shaft 2 until they are engaged, the first shaft 1 and the second shaft 2 are synchronized Rotate, you can rotate separately by releasing the connection between the two.

Specifically, the outer end surface of the first roller 5 is provided with a mounting hole, the inner end of the second roller 6 is inserted into the mounting hole and can move along the mounting hole, and the inner end surface of the second roller 6 has a second tooth surface 61, The bottom surface of the mounting hole has a first tooth surface 51. It should be noted that the outer end surface refers to the left end surface of the first roller 5 shown in FIG. 1-2, that is, the plane located at the outer end when installed. When the second roller 6 is sleeved outside the second shaft 2, a mounting hole is opened on the outer end surface, that is, a mounting hole is provided in the hollow cavity of the second roller 6, and a second tooth surface 61 is provided on the bottom surface of the mounting hole, then the first The inner end of a roller 5 is inserted into the mounting hole and moves along the mounting hole to make the first tooth surface 51 of the end portion mesh with the second tooth surface 61.

Further, when the return elastic member 7 is provided, it is preferable that one end of the return elastic member 7 abuts the end of the first shaft 1 and the other end abuts the second roller 6. The second roller 6 is sleeved outside the second shaft 2, and the second roller 6 has a stepped surface 62 in the hollow cavity, and the return elastic member 7 is disposed between the stepped surface 62 and the first shaft 1 through the stepped surface 62 It is easy to install the reset elastic 7.

On the basis of the foregoing embodiments, a locking member 8 for locking the first shaft 1 and the second shaft 2 in a connected state is also included. The locking member 8 has two working states, namely a locked state and an unlocked state. Furthermore, when the first shaft 1 and the second shaft 2 are connected, the locking member 8 locks the first shaft 1 and the second shaft 2, so that no external force is required to push the first shaft 1 or the second shaft 2 to keep them connected, which is convenient The user simultaneously adjusts the focal length of the left and right eyes. However, when the focal length of the left eye or the eyed eye needs to be adjusted separately, the locking member 8 is unlocked, and the first axis 1 and the second axis 2 can be relatively moved to separate, and the focal length of the left eye or the eyed eye can be adjusted separately as needed.

Further, the locking member 8 includes a buckle 81 and an unlocking elastic member 82 for pushing the buckle 81 back, the inner end of the second shaft 2 has a chuck 21, and the second shaft 2 presses the lock when moving relative to the first shaft 1 The stopper 8 is inserted into the buckle 81 to lock the chuck 21, and when the second shaft 2 is pressed again, the unlocking elastic member 82 pushes the buckle 81 to release the chuck 21. It should be noted that the inner end of the second shaft 2 refers to the other end opposite to the above outer end, as shown in FIG. 1-2 is the right end. Then the second shaft 2 moves relative to the first shaft 1 until the two are connected. At the same time, the chuck 21 of the second shaft 2 presses the locking member 8 so that the chuck 21 is inserted into the buckle 81 and locked, and the second shaft 2 is locked Thus, the first shaft 1 and the second shaft 2 are locked. When unlocking, the second shaft 2 is pressed again, and the unlocking elastic member 82 pushes the buckle 81 to release the chuck 21, so that the second shaft 2 is unlocked, and the first shaft 1 and the second shaft 2 resume to separate and rotate. That is, the locking member 8 may adopt an axial pressing locking component, press to lock the second shaft 2, and press again to unlock the second shaft 2. Specifically, the unlocking elastic member 82 may be a spring, and other conventional materials or structural members with elastic restoring force in the prior art may also be used as needed.

Please refer to FIG. 5, which is a schematic diagram of an explosion structure of a locking component 8. When the second shaft 2 is pressed, the second shaft 2 compresses and unlocks the elastic member 82, and the elastic catch 81 of the locking member 8 will touch the side wall of the locking member 8 to rotate inward, and then lock the second shaft 2 The head chuck 21 prevents the second shaft 2 from being locked back. When the second shaft 2 is pressed again, the internal stop of the locking member 8 is released, and the unlocking elastic member 82 pushes the second shaft 2 to move backward. The latch 81 elastically releases the locking position of the second shaft 2 by itself. The internal stop may specifically include a rotating buckle 83, the top of the rotating buckle 83 is hinged with the buckle 81, and the bottom end has a rotating chuck 85. The locking member 8 includes a housing and a buckle 81 slidably installed in the housing. The outer wall of the housing is provided with a bayonet. The shape of the bayonet is shown in FIG. 8, including a first position with a lower height and a higher height The second position, between the first position and the second position, is an inclined wall. The inner wall surface has a boss, and the boss has an inner wall inclined surface 84 that cooperates with the bayonet. The top end of the inner wall inclined surface 84 is inclined from the second position to the first position from top to bottom, and the bottom end conforms to the shape of the bayonet. The original installation position is inclined.

Specifically, please refer to FIG. 6, which is a schematic diagram of the state of the locking member when the second shaft 2 is not pressed. Due to the structural shape of the buckle 81 itself is opened. Please refer to FIG. 7, which is a schematic view of a state in which the second axis is locked by the locking member. When the second shaft is pressed, the buckle 81 will be squeezed by the housing to rotate inward, and the rotating buckle 83 will also rotate along the inner wall slope 84, when it turns to the first position of the outer wall bayonet shown in FIG. 8, The rotating chuck 85 of the rotating buckle 83 is stuck at the first position, and then the buckle 81 cannot be reset due to the elastic force of the unlocking elastic member 82, and the buckle 81 catches the head of the second shaft so that the second shaft cannot go back Furthermore, the first shaft and the second shaft are integrated and can rotate together.

Please refer to FIG. 9, which is a schematic diagram of the cross-sectional structure of FIG. 8. When the second axis is pressed again, the second axis will continue to push the buckle 81 down to move, the rotating buckle 83 will continue to rotate, and the rotating chuck 85 slides from the first position into the second position, and then due to the unlocking elasticity When the reset force of the piece 82 is pushed, the rotating chuck 85 enters the inside of the outer wall with the reset of the buckle 81, and returns to the upper side of the inclined surface 84 of the inner wall to wait for the next press. The buckle 81 releases the head of the second shaft, and the second shaft can also Reset, so that the first axis is separated from the second axis.

The specific structure and working principle of the locking member can also refer to the conventional axial pressing locking assembly in the prior art. As needed, the locking member 8 can also adopt other conventional components with locking and unlocking functions in the prior art.

In the above embodiments, the first bevel gear 9 is fixed on the first shaft 1, the third bevel gear 11 meshing with the first bevel gear 9 is fixedly connected to the end of the first transmission shaft 3; A second bevel gear 10 is slidably installed in the axial direction, and a fourth bevel gear 12 meshing with the second bevel gear 10 is fixedly connected to the end of the second transmission shaft 4. Of course, the second bevel gear 10 should rotate synchronously with the second shaft 2. Through the cooperation of the bevel gear set, the rotations of the first shaft 1 and the second shaft 2 can be effectively and reliably transmitted to the first transmission shaft 3 or the second transmission shaft 4, respectively. The second bevel gear 10 is slidingly mounted on the second shaft 2, and when the first shaft 1 and the second shaft 2 move relatively, the second bevel gear 10 can always maintain the meshing with the fourth bevel gear 12, thereby ensuring the corresponding mirror The distance between the barrel 14 and the display 15 is effectively adjusted. Preferably, the second bevel gear 10 and the second shaft 2 are engaged with each other through a key, so that the second bevel gear 10 can move relative to the second shaft 2 in the axial direction and can rotate synchronously with the second shaft 2.

Based on the focus adjustment device provided in the above embodiment, the present invention also provides a head-mounted display device, which includes any one of the focus adjustment devices in the above embodiment. The focal length adjusting device is installed between the front case 16 and the rear case 17 of the head-mounted display device. Since the head-mounted display device adopts the focal length adjusting device in the above embodiment, for the beneficial effects of the head-mounted display device, please refer to the above embodiment.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

A focal length adjusting device for a head-mounted display device, characterized in that it includes a first shaft (1), a second shaft (2), and a first for screw connection with a lens barrel (14) on the left and right sides, respectively A transmission shaft (3) and a second transmission shaft (4), when the first shaft (1) rotates, the first transmission shaft (3) is driven to rotate to adjust the corresponding lens barrel (14) to the display (15) Distance, when the second shaft (2) rotates, the second transmission shaft (4) is rotated to adjust the distance between the corresponding lens barrel (14) and the display screen (15), and the first shaft (1 ) And the second shaft (2) can be relatively moved to connect and rotate synchronously or separate and rotate separately.
The focal length adjusting device according to claim 1, wherein the first shaft (1) is cylindrical, and the second shaft (2) is sleeved in the first shaft (1) and can The first axis (1) moves.
The focal length adjusting device according to claim 2, characterized in that a reset elastic member (7) is provided between the first shaft (1) and the second shaft (2) to (1) Elastic deformation occurs when moving relative to the second axis (2).
The focal length adjusting device according to claim 2, wherein the outer end of the first shaft (1) is fixedly connected with a first roller (5), and the outer end of the second shaft (2) is fixedly connected with The second roller (6).
The focal length adjusting device according to claim 4, wherein the first roller (5) and the second roller (6) are disposed on the same side, and the first roller (5) and the first roller The second roller (6) is respectively provided with a matched first tooth surface (51) and a second tooth surface (61), so that the first roller (5) and the second roller (6) are along the axial direction When the first tooth surface (51) and the second tooth surface (61) are relatively moved to mesh, the first roller (5) and the second roller (6) rotate synchronously.
The focal length adjusting device according to claim 5, wherein a mounting hole is opened on the outer end surface of the first roller (5), and an inner end of the second roller (6) is inserted into the mounting hole and It can move along the mounting hole, and the inner surface of the second roller (6) has the second tooth surface (61), and the bottom surface of the mounting hole has the first tooth surface (51).
The focal length adjusting device according to any one of claims 1-6, further comprising a lock for locking the first shaft (1) and the second shaft (2) in a connected state Part (8).
The focal length adjusting device according to claim 7, characterized in that the locking member (8) includes a buckle (81) and an unlocking elastic member (82) for pushing the buckle (81) to reset, so An inner end of the second shaft (2) has a chuck (21), and when the second shaft (2) moves relative to the first shaft (1), the locking member (8) is pressed to make the card The head (21) is inserted into the buckle (81) and locked, and when the second shaft (2) is pressed again, the unlocking elastic member (82) pushes the buckle (81) to lock the card The head (21) is released.
The focal length adjusting device according to any one of claims 1 to 6, characterized in that a first bevel gear (9) is fixed on the first shaft (1), and the end of the first transmission shaft (3) A third bevel gear (11) meshing with the first bevel gear (9) is fixedly connected to the part; a second bevel gear (10) is slidingly mounted on the second shaft (2) in the axial direction, and the first A fourth bevel gear (12) meshing with the second bevel gear (10) is fixedly connected to the end of the second transmission shaft (4).
A head-mounted display device, characterized by comprising the focal length adjusting device according to any one of claims 1-9.