CN220323643U

CN220323643U - Head-mounted display device

Info

Publication number: CN220323643U
Application number: CN202321281605.3U
Authority: CN
Inventors: 范亚华; 李松; 李栋
Original assignee: Play Out Dreams Shanghai Technology Co ltd
Current assignee: Play Out Dreams Shanghai Technology Co ltd
Priority date: 2023-05-25
Filing date: 2023-05-25
Publication date: 2024-01-09
Anticipated expiration: 2033-05-25

Abstract

The application provides a head-mounted display device, which comprises a headrest shell, a driving gear, at least two head bands, an adjusting hand wheel and an energy storage battery, wherein the headrest shell comprises an installation space; the driving gear is arranged in the installation space; each of the head bands comprises a rack which is penetrated into the installation space and meshed with the opposite side of the driving gear; one end of the adjusting hand wheel is inserted into the installation space and can indirectly drive the driving gear to rotate; the energy storage battery is arranged in the installation space. Can indirect drive driving gear rotation through adjusting the hand wheel, based on the meshing of driving gear and rack, can drive the both ends area and be close to each other or deviate from in step to can be through the relative position of single hand operation adjusting the hand wheel control bandeau, with the head of the different users of adaptation enclose, thereby can realize miniaturized design in order to solve current wear-type display device and be difficult for single hand regulation, and space arrangement unreasonable technical problem.

Description

Head-mounted display device

Technical Field

The application relates to the technical field of head-mounted display equipment.

Background

The display device (i.e. VR head display and VR glasses) is a brand new technology in modern display technology, and the display principle is that the left and right eye screens respectively display left and right eye images, and human eyes acquire the information with difference and then generate stereoscopic impression in the brain. The head-mounted display device can seal the outside vision and hearing of a wearer, and guide the user to generate a feeling of the user in the virtual environment, so that the head-mounted display device has very important application in the aspects of enhanced display, virtual reality, stereoscopic display and the like, and the application scene of the head-mounted display device is expanded to the fields of games, performances, sports games, electronic commerce, education, real estate, medicine and the like.

In the prior art, a circle of binding band is sleeved on the head of a user, and as the head circumferences of different users have certain difference, a fastener is arranged on the rear brain or the head of the head-mounted display device for adjusting the length of the binding band.

The display part of the head-mounted display device has a certain weight, so that the weight distribution of the device is balanced, and the length adjusting structure of the binding band is arranged behind the brain, so that the mode of adjusting the length of the binding band by using the fastener is inconvenient for one-hand operation, and a plurality of inconveniences exist in the wearing process. Meanwhile, the space arrangement of the battery and the fastener needs to be reasonably designed, and the existing structural distribution is optimized.

Disclosure of Invention

The application provides a head-mounted display device to solve current head-mounted display device and be difficult for one hand to adjust, and space arrangement irrational technical problem.

The application provides a head-mounted display device, which comprises a headrest shell, a driving gear, at least two head bands, an adjusting hand wheel and an energy storage battery, wherein the headrest shell comprises an installation space; the driving gear is arranged in the installation space; each of the head bands comprises a rack which is penetrated into the installation space and meshed with the opposite side of the driving gear; one end of the adjusting hand wheel is inserted into the installation space and can indirectly drive the driving gear to rotate; the energy storage battery is arranged in the installation space.

Optionally, the head-mounted display device further includes a mounting substrate connected to an inner wall of the headrest housing, and a control board; the control board is arranged on the mounting substrate, and the energy storage battery is electrically connected to the control board; the mounting substrate is concave to form a fixing cavity, and the energy storage battery is embedded into the fixing cavity.

Optionally, the fixing cavities are symmetrically arranged at two ends of the mounting substrate, and the control board is positioned between the two fixing cavities; the middle part of the mounting substrate is provided with a first through hole, and the control board is provided with a second through hole corresponding to the first through hole.

Optionally, the head-mounted display device further comprises a wire electrically connected to the control board; the middle part of the mounting substrate is concavely provided with an avoidance groove, and the avoidance groove and the fixing cavity are respectively positioned on two opposite surfaces of the mounting substrate; the wire is accommodated in the avoidance groove.

Optionally, the head-mounted display device further includes a fixing seat, a ratchet disc and an adjusting disc, wherein the fixing seat is a hollow cylinder, and one end of the fixing seat is connected to the end face of the driving gear; the ratchet disc is connected to the headrest shell, and the end face of the ratchet disc is provided with a ratchet; the adjusting disc is connected to the other end of the fixed seat, the adjusting disc comprises a first adjusting arm and a second adjusting arm, the first adjusting arm comprises a first pawl meshed with the ratchet, and the second adjusting arm comprises a second pawl meshed with the ratchet; wherein when the first pawl and the second pawl are both engaged to the ratchet teeth, the adjustment disk is capable of driving the drive gear to rotate in a first direction; when the first pawl and the second pawl are both disengaged from the ratchet teeth, the adjustment disk is capable of driving the drive gear to rotate in a second direction, the first direction being opposite the second direction.

Optionally, the adjusting hand wheel includes a first fixing column, a second fixing column and a third fixing column, and the first fixing column is connected to the adjusting hand wheel and is attached to the first adjusting arm; the second fixing column is connected to the adjusting hand wheel and is attached to the second adjusting arm; the third fixing column is connected to the adjusting hand wheel, the adjusting plate is provided with a limiting groove, and the end part of the third fixing column is clamped in the limiting groove; when the adjusting hand wheel rotates along the first direction, the third fixing column is abutted to one end of the limiting groove and drives the adjusting disc to rotate; when the adjusting hand wheel rotates along the second direction, the third fixing column moves and is abutted to the other end of the limiting groove, the first fixing column drives the first pawl to be separated from the ratchet through the first adjusting arm, and the second fixing column drives the second pawl to be separated from the ratchet through the second adjusting arm.

Optionally, the head-mounted display device further includes a display housing, the display housing including a detachably connected display inner shell and a display outer shell; the headband comprises an inner band and an outer band which are detachably connected; the inner band is connected to the display inner shell and the outer band is connected to the display outer shell.

Optionally, the inner band is integrally formed with the display inner shell; the outer band is integrally formed with the display housing.

Optionally, the head-mounted display device further comprises a wire, and the wire is arranged in the headrest shell; the inner belt is bent towards the outer belt to form a wire arrangement space, and the wires penetrate through the wire arrangement space and extend into the display shell.

Optionally, the head-mounted display device further includes a head rest, the head rest is connected to the headrest housing, and the head rest has an arc structure for fitting to the head of the user.

The application provides a head-mounted display device, which can indirectly drive a driving gear to rotate through an adjusting hand wheel, and can drive two belts to synchronously approach or depart from each other based on the engagement between the driving gear and racks on two sides of the driving gear; therefore, the relative positions of the two head bands can be controlled by operating the adjusting hand wheel by one hand, so that the adjusting difficulty of the head-mounted display equipment can be reduced, and the head bands of different users can be quickly adapted; meanwhile, the driving gear can drive racks on two sides to synchronously move, so that the headband can synchronously approach or depart from the same distance, the adjusting precision can be improved, and the headrest shell can be controlled to be always attached to the back of the brain of a user in the adjusting process, so that wearing comfort is guaranteed.

The driving gear and the energy storage battery are arranged in the installation space, so that the weight of each part in the headrest shell is approximately equal to that of each part in the display shell, the weight distribution of the head-mounted display device can be balanced, and the wearing comfort of a user is improved. Through the installation space in the reasonable utilization headrest casing, realize the arrangement of a plurality of parts such as driving gear and energy storage battery, can realize head-mounted display device's miniaturized design.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a head-mounted display device provided in the present application;

FIG. 2 is an exploded schematic view of a part of the structure of the head mounted display device provided in the present application;

FIG. 3 is a schematic diagram illustrating the cooperation of a driving gear and a rack in the head-mounted display device provided by the present application;

FIG. 4 is a cross-sectional view of an adjustment hand wheel, adjustment plate and drive gear in the head mounted display device provided herein;

FIG. 5 is a cross-sectional view of an adjustment hand wheel, adjustment plate and ratchet plate in the head mounted display device provided herein;

fig. 6 is an exploded schematic view of a mounting substrate, an energy storage battery and a control board in the head-mounted display device provided by the present application.

Reference numerals illustrate:

100. a display housing; 110. a display housing; 120. displaying the inner shell; 200. a headband; 210. an outer belt; 220. an inner belt; 230. a rack; 300. a headrest housing; 310. a first housing; 311. a fixed rod; 320. a second housing; 400. an adjusting hand wheel; 410. a first fixing column; 420. a second fixing column; 430. a third fixing column; 500. a ratchet disc; 510. a ratchet; 520. a limit groove; 600. an adjusting plate; 610. a first adjustment arm; 611. a first pawl; 620. a second adjustment arm; 621. a second pawl; 700. a drive gear; 710. a fixing seat; 810. a mounting substrate; 811. a fixed cavity; 812. an avoidance groove; 813. a first through hole; 820. an energy storage battery; 830. a control board; 831. a second through hole; 900. a head rest; 910. a pillow body; 920. a connecting plate; 921. a fixing groove.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without inventive effort. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the drawings in which the device is actually used or in an operating state.

The application provides a head-mounted display device, which is described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

Referring to fig. 1, the present application provides a head-mounted display device, which includes a display housing 100, a headrest housing 300, and at least two head bands 200, wherein the display housing 100 is attached to a face of a user, and the headrest housing 300 is attached to a back of a brain of the user. One end of each head band 200 is connected to the display housing 100, and the other end thereof is inserted into the inside of the headrest housing 300, so that the display housing 100, the headrest housing 300, and the head band 200 may form a surrounding space for adapting to the head of a user.

Referring to fig. 1, the display housing 100 includes a display inner housing 120 and a display outer housing 110 which are detachably connected, and the display inner housing 120 and the display outer housing 110 may be fixed by fastening screws. The display inner case 120 may be attached to the face of the user, and the display outer case 110 is an arc-shaped case, and forms a space with the display inner case 120 for installing a display main body capable of transmitting optical signals to eyes.

Referring to fig. 1, each headband 200 includes an outer band 210 and an inner band 220 that are detachably connected, wherein the outer band 210 and the inner band 220 can be fixed by a fastening structure, a plurality of fasteners are provided on the inner band 220, and a clamping slot is correspondingly provided on the outer band 210. One end of the outer band 210 is fixedly coupled to the display outer case 110, and one end of the inner band 220 is fixedly coupled to the display inner case 120. The outer band 210 is integrally formed with the display outer case 110, and the inner band 220 is integrally formed with the display inner case 120.

The outer belt 210 and the display housing 110 are integrally formed by injection molding, so that the strength of the joint between the end of the outer belt 210 and the display housing 110 can be improved, the processing difficulty can be reduced, the processing efficiency can be improved, meanwhile, the assembly of the display housing 100 and the headband 200 can be facilitated, and the assembly precision and efficiency can be improved.

Similarly, the inner band 220 and the display inner shell 120 are also integrally injection molded, so that the strength of the joint between the end part of the inner band 220 and the display inner shell 120 can be improved, the processing difficulty can be reduced, the processing efficiency can be improved, meanwhile, the assembly of the display shell 100 and the headband 200 can be facilitated, and the assembly precision and efficiency can be improved.

Referring to fig. 1, both sides of the inner tape 220 are bent toward the outer tape 210, and a flat space is formed to facilitate assembly of other components after the inner tape 220 is connected to the outer tape 210.

Referring to fig. 1 and 2, the headrest housing 300 is a hollow waist-shaped structure, and is assembled by a first housing 310 and a second housing 320. The portion that fits behind the user's brain is defined as a first housing 310 and the portion that is away from the user's brain is defined as a second housing 320. The first shell 310 and the second shell 320 which can be assembled are utilized to facilitate the processing and the preparation of the headrest shell 300, meanwhile, the assembly difficulty can be reduced, and the assembly efficiency can be improved.

Referring to fig. 2-4, the headrest housing 300 includes an installation space, in which a fixing base 710 and a driving gear 700 are disposed, the fixing base 710 is a hollow column structure, one end of the fixing base is fixedly connected to an end surface of the driving gear 700, and the other end of the fixing base extends to an inner wall of the first housing 310. Each of the aforementioned headband 200 includes a rack 230, and the rack 230 is penetrated into the installation space and can be engaged to the opposite side of the driving gear 700. The rack 230 in this application can be penetrated into the installation space from the left and right sides of the headrest housing 300 and engaged to the upper and lower sides of the driving gear 700, respectively. When the driving gear 700 rotates, the two racks 230 may be driven to approach or depart synchronously based on the engagement of the driving gear 700 with the racks 230, thereby adjusting the length of the two headband 200 according to the head circumference adaptability of the user.

Referring to fig. 2 to 5, the head-mounted display apparatus further includes a ratchet disc 500 and an adjustment disc 600, the ratchet disc 500 being fixed to the outer surface of the first housing 310 facing the display housing 100 such that the ratchet disc 500 is fixed with respect to the headrest housing 300; the other end surface of the ratchet disc 500 is provided with a plurality of ratchet teeth 510.

Referring to fig. 4 and 5, the adjusting plate 600 is disposed inside the ratchet plate 500, and a column is disposed at the bottom of the adjusting plate 600 and is clamped to the end of the fixing base 710 near the first housing 310. The adjustment plate 600 includes a first adjustment arm 610 and a second adjustment arm 620, the first adjustment arm 610 including a first pawl 611 engageable with the ratchet 510, the second adjustment arm 620 including a second pawl 621 engageable with the ratchet 510. The first adjusting arm 610 and the second adjusting arm 620 have a certain elastic deformation property, and by applying a tensile force to the first adjusting arm 610 and the second adjusting arm 620, the first adjusting arm 610 and the second adjusting arm 620 can be offset towards the center of the adjusting disk 600, so as to drive the first pawl 611 and the second pawl 621 to synchronously approach the center of the adjusting disk 600, so that the first pawl 611 and the second pawl 621 are separated from the ratchet 510.

When the first and second adjustment arms 610 and 620 are not subjected to external tension, the first and second pawls 611 and 621 are kept engaged with the ratchet 510, and the adjustment disk 600 can rotate the driving gear 700 in the first direction (counterclockwise direction in this application). When a pulling force is applied to the first and second adjustment arms 610 and 620, the first and second pawls 611 and 621 are disengaged from the ratchet teeth 510, and the adjustment disk 600 can rotate the driving gear 700 in the second direction (clockwise in this application).

Referring to fig. 4, the head-mounted display device further includes an adjusting hand wheel 400, wherein the adjusting hand wheel 400 is covered on the outer portions of the adjusting disc 600 and the ratchet disc 500, and a connecting column is disposed at the middle portion thereof, and the connecting column penetrates the main body and the inner portion of the fixing base 710 and is rotatably connected with the fixing base 710.

Referring to fig. 4 and 5, the inner wall of the adjusting hand wheel 400 is provided with a first fixing post 410, a second fixing post 420 and a plurality of third fixing posts 430, wherein the central axes of the first fixing post 410, the second fixing post 420 and the third fixing post 430 are parallel to the central axis of the fixing base 710. The first fixing post 410 is attached to the first adjusting arm 610, so that a heart-pulling force can be applied to the first adjusting arm 610; the second fixing post 420 is attached to the second adjustment arm 620 so that a heart-pulling force can be applied to the second adjustment arm 620.

Referring to fig. 5, the adjusting plate 600 includes a plate body, and the first adjusting arm 610 and the second adjusting arm 620 are connected to the plate body. The first adjusting arm 610 includes a first arc-shaped arm and a first connecting arm, the first pawl 611 is provided on an outer wall of the first arc-shaped arm, and the first connecting arm includes opposite first and second ends, wherein the first end of the first connecting arm is connected to an end of the first arc-shaped arm, and the second end thereof extends toward the other end of the first arc-shaped arm.

In the initial state, the first fixing post 410 is attached to the second end of the first connection arm, and when the dial 600 is rotated clockwise, the first fixing post 410 moves from the second end to the first end. Since the first end is spaced from the center of the adjustment plate 600 more than the second end is spaced from the center of the adjustment plate 600, the first fixing post 410 drives the first adjustment arm 610 to be close to the center of the adjustment plate 600, thereby disengaging the first pawl 611 from the ratchet teeth 510.

Referring to fig. 5, the second adjusting arm 620 includes a second arc-shaped arm and a second connecting arm, the second pawl 621 is disposed on an outer wall of the second arc-shaped arm, and the second connecting arm includes a third end and a fourth end opposite to each other, wherein the third end of the second connecting arm is connected to the end of the second arc-shaped arm, and the fourth end extends toward the other end of the second arc-shaped arm.

In the initial state, the second fixing post 420 is attached to the fourth end of the second connection arm, and when the dial 600 is rotated clockwise, the second fixing post 420 moves from the fourth end to the third end. Since the third end is spaced from the center of the adjustment plate 600 more than the fourth end is spaced from the center of the adjustment plate 600, the second fixing post 420 drives the second adjustment arm 620 to be close to the center of the adjustment plate 600, thereby disengaging the second pawl 621 from the ratchet teeth 510.

Referring to fig. 5, the adjusting plate 600 is provided with an arc-shaped limiting groove 520, and an end of the third fixing post 430 may be inserted into one end of the limiting groove 520, where the length of the limiting groove 520 is equal to the distance between the first end and the second end, so that when the first fixing post 410 moves from the second end to the first end, the third fixing post 430 can move from one end of the limiting groove 520 to the other end thereof.

When the adjusting hand wheel 400 rotates counterclockwise, the first adjusting arm 610, the second adjusting arm 620 and the adjusting hand wheel 400 are kept unchanged because the third fixing post 430 is abutted to the end of the limit groove 520, and at this time, the first pawl 611 and the second pawl 621 are engaged with the ratchet 510, and the adjusting hand wheel 400 can be rotated to drive the adjusting disk 600 to rotate counterclockwise synchronously.

Referring to fig. 2 and 6, the head mounted display device further includes an energy storage battery 820, a mounting substrate 810, a control board 830, and wires (not shown), wherein the mounting substrate 810 is connected to an inner wall of the second housing 320 such that the mounting substrate 810 is fixed with respect to the headrest housing 300. The surface of the installation substrate 810 is concavely formed with a fixing cavity 811, and the energy storage batteries 820 are installed in the fixing cavity 811, in this application, the fixing cavity 811 is symmetrically formed at the end of the installation substrate 810, so that the two energy storage batteries 820 are symmetrically arranged with respect to the center of the installation substrate 810, and thus the weight distribution of the components in the headrest housing 300 is reasonably designed, and the weight distribution of the head-mounted display device is balanced.

Referring to fig. 6, a control board 830 is fixed to the middle of the mounting substrate 810 and is located between the two energy storage cells 820. Since both the energy storage batteries 820 and the wires are electrically connected to the control board 830, fixing the control board 830 to the middle of the mounting substrate 810 facilitates the electrical connection of the components to the control board 830, so that the mounting space within the headrest housing 300 can be more reasonably utilized.

Referring to fig. 6, a first through hole 813 is formed in the middle of the mounting substrate 810, a second through hole 831 corresponding to the first through hole 813 is correspondingly formed in the control board 830, and the fixing base 710 can sequentially pass through the first through hole 813 and the second through hole 831, so as to avoid the mounting substrate 810 and the fixing base 710.

Referring to fig. 3 and 6, a recess 812 is formed in the middle of the mounting substrate 810, and the recess 812 and the fixing cavity 811 are respectively located on two opposite surfaces of the mounting substrate 810, i.e., the control board 830 is mounted on a surface facing away from the recess 812. The avoidance groove 812 and the driving gear 700 form a space, so that the wires can be stored into the avoidance groove 812, thereby facilitating the electrical connection between the wires and the control board 830, and simultaneously, the wires can be stored more reasonably.

Referring to fig. 1 and 6, the conductive wires are received in the escape groove 812, and simultaneously the conductive wires can be penetrated out of the headrest housing 300 and penetrated into the wire arrangement space formed by the inner belt 220 and the outer belt 210, thereby facilitating the conductive wires to extend into the display housing 100.

Referring to fig. 1 and 2, the head-mounted display device further includes a head rest 900, and the head rest 900 has an arc structure to make it fit to the head of the user. The headrest includes a headrest body 910 and a connection plate 920, wherein the headrest body 910 is made of an elastic material, thereby improving wearing comfort. The connection plate 920 is made of a rigid material to ensure the stability and reliability of the use of the head rest 900. The head rest 900 is connected to the surface of the first housing 310, in this application, the surface of the first housing 310 is provided with a fixing rod 311, the connecting plate 920 is correspondingly provided with a fixing groove 921, and the fixing rod 311 can be embedded into the fixing groove 921 and is in interference fit with the fixing groove 921, so that the head rest 900 and the headrest housing 300 can be relatively fixed.

Referring to fig. 1-6, the driving gear 700 can be indirectly driven to rotate by the adjusting hand wheel 400, and the two head bands 200 can be driven to synchronously approach or depart from each other based on the engagement of the driving gear 700 and the rack 230, so that the relative position of the head bands 200 can be controlled by operating the adjusting hand wheel 400 with one hand to adapt to the head circumferences of different users.

Meanwhile, the driving gear 700 and the energy storage battery 820 are arranged in the installation space, so that the weight distribution of the head-mounted display device can be balanced, and meanwhile, the miniaturization design can be realized.

The foregoing has provided a head mounted display device for the purposes of providing a detailed description of the principles and embodiments of the present application, and specific examples have been provided herein to assist in understanding the methods of the present application and their core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims

1. A head-mounted display device, comprising:

a headrest housing (300) including an installation space;

a driving gear (700) provided in the installation space;

at least two head bands (200), each head band (200) comprising a rack (230), the rack (230) penetrating into the installation space and engaging to opposite sides of the driving gear (700);

an adjusting hand wheel (400) one end of which is inserted into the installation space and can indirectly drive the driving gear (700) to rotate; and

and an energy storage battery (820) provided in the installation space.

2. The head mounted display device of claim 1, further comprising:

a mounting substrate (810) connected to an inner wall of the headrest housing (300); and

a control board (830) provided to the mounting substrate (810), the energy storage battery (820) being electrically connected to the control board (830);

the mounting substrate (810) is concavely provided with a fixing cavity (811), and the energy storage battery (820) is embedded into the fixing cavity (811).

3. The head mounted display device of claim 2, wherein the display device further comprises a display device,

the fixing cavities (811) are symmetrically arranged at two ends of the mounting substrate (810), and the control board (830) is arranged between the two fixing cavities (811);

the middle part of the mounting substrate (810) is provided with a first through hole (813), and the control board (830) is provided with a second through hole (831) corresponding to the first through hole (813).

4. The head mounted display device of claim 2, further comprising:

a wire electrically connected to the control board (830);

the middle part of the mounting substrate (810) is concavely provided with an avoidance groove (812), and the avoidance groove (812) and the fixing cavity (811) are respectively positioned on the opposite surfaces of the mounting substrate (810); the wire is received in the avoidance groove (812).

5. The head mounted display device of claim 1, further comprising:

a fixing base (710) which is a hollow column, one end of which is connected to the end face of the driving gear (700);

a ratchet plate (500) connected to the headrest housing (300) and provided with a ratchet (510) at an end surface thereof; and

an adjusting disc (600) connected to the other end of the fixing base (710), the adjusting disc (600) comprising a first adjusting arm (610) and a second adjusting arm (620), the first adjusting arm (610) comprising a first pawl (611) engaged with the ratchet (510), the second adjusting arm (620) comprising a second pawl (621) engaged with the ratchet (510);

wherein the adjustment disc (600) is capable of driving the drive gear (700) to rotate in a first direction when both the first pawl (611) and the second pawl (621) are engaged to the ratchet teeth (510); when both the first pawl (611) and the second pawl (621) are disengaged from the ratchet teeth (510), the adjustment plate (600) is capable of driving the drive gear (700) to rotate in a second direction, the first direction being opposite to the second direction.

6. The head mounted display device according to claim 5, wherein the adjustment hand wheel (400) comprises:

a first fixed column (410) connected to the adjustment hand wheel (400) and fitted to the first adjustment arm (610);

a second fixed post (420) connected to the adjustment hand wheel (400) and fitted to the second adjustment arm (620); and

the third fixing column (430) is connected to the adjusting hand wheel (400), the adjusting disc (600) is provided with a limiting groove (520), and the end part of the third fixing column (430) is clamped into the limiting groove (520);

when the adjusting hand wheel (400) rotates along the first direction, the third fixing column (430) is abutted to one end of the limiting groove (520) and drives the adjusting disc (600) to rotate; when the adjusting hand wheel (400) rotates along the second direction, the third fixing column (430) moves and abuts against the other end of the limiting groove (520), the first fixing column (410) drives the first pawl (611) to be separated from the ratchet (510) through the first adjusting arm (610), and the second fixing column (420) drives the second pawl (621) to be separated from the ratchet (510) through the second adjusting arm (620).

7. The head mounted display device of claim 1, further comprising:

a display housing (100) including a detachably connected display inner case (120) and a display outer case (110);

wherein the headband (200) includes a removably connected inner band (220) and an outer band (210); the inner band (220) is connected to the display inner case (120), and the outer band (210) is connected to the display outer case (110).

8. The head mounted display device of claim 7, wherein the display device further comprises a display device,

the inner band (220) is integrally formed with the display inner shell (120); the outer band (210) is integrally formed with the display housing (110).

9. The head mounted display device of claim 7, further comprising:

a wire provided in the headrest housing (300);

the inner band (220) is bent towards the outer band (210) and forms a wire arrangement space, and the wires pass through the wire arrangement space and extend into the display shell (100).

10. The head mounted display device of claim 1, further comprising:

the headrest comprises a headrest housing (300) and a headrest (900), wherein the headrest (900) is connected to the headrest housing, and is of an arc-shaped structure and is used for being attached to the head of a user.