Head-mounted device

Abstract

The utility model discloses a head-mounted device, a head band part of the head-mounted device adopts a multi-air-chamber flexible inflatable head band structure, and the curvature change range of different parts is controlled by controlling the air chamber arrangement density of each part of the head band, so that the deformation degrees of the different parts of the head band are changed in a gradient manner. The miniature diaphragm pump is arranged to inflate the multi-air-chamber flexible inflatable head band, so that the head band is deformed, and the head-mounted equipment stably wraps the head of a user. Compared with the prior art, the multi-air-chamber flexible inflatable headband system has the advantages that the provided head-mounted equipment can adapt to head circumference and head types of different users, good headband system fixing reliability and wrapping feeling are obtained, and meanwhile the multi-air-chamber flexible inflatable headband system is few in part, simple in production process and low in cost.

Description

Technical Field

[0001] The utility model relates to the field of intelligent head-mounted equipment, in particular to a head-mounted equipment. Background Art

[0002] In the prior art, head-mounted smart devices are usually head-mounted virtual reality devices, also called virtual reality glasses, including VR glasses and AR glasses. Virtual reality technology is a simulated visual system that can create and experience a virtual world. It generates a simulated environment, which is a multi-source information fusion, interactive three-dimensional dynamic vision and entity behavior system simulation that immerses users in the environment.

[0003] VR glasses are a kind of virtual reality head-mounted display device, created with the help of computers and the latest sensor technology. It is a new human-computer interaction product that allows users to enter the virtual world of electronic devices. With the development of electronic technology, VR glasses will gradually become popular in people's daily lives.

[0004] Existing head-mounted devices are mostly of two types: elastic headbands and semi-rigid headbands. The elastic headband uses an elastic rope as the main body of the headband. Its advantages are good adaptability to different head circumferences, simple design and manufacturing, and low cost. Its disadvantages are poor fixing reliability and weak dynamic stability. The semi-rigid headband generally has rigid surrounds, telescopic braking devices (usually composed of motors, reducers, gear racks, etc.), headrests and other components. Its advantages are reliable fixing, good adjustability, and comfortable wearing due to the headrest. Its disadvantages are high cost, complex structural design and control system design, and large size and weight of the telescopic braking device. Existing head-mounted devices cannot achieve the goal of reducing costs while ensuring their wearing stability. Utility Model Content

[0005] The utility model provides a head-mounted device, which is used to solve the problem that the existing head-mounted device cannot achieve the stability of wearing while reducing the cost.

[0006] In order to solve the above technical problems, the utility model discloses the following technical solutions:

[0007] The utility model provides a head-mounted device, comprising a mainframe support, two relatively arranged fixing belts, two flexible shells and a micro diaphragm pump.

[0008] The fixing belt includes at least one air chamber and a flexible plate, and the air chambers of one fixing belt are arranged in sequence on the surface of the flexible plate of the fixing belt away from the other fixing belt; the air chamber is in the shape of a cylinder, the cross-section of the cylinder is rectangular or trapezoidal, and the flexible plate can be bent; the two flexible shells are respectively mounted on a fixing belt, and the flexible shells can be deformed together with the fixing belt; the micro diaphragm pump includes an air inlet and an exhaust port, and the micro diaphragm pump is installed to one end of the fixing belt facing the main frame bracket, and an exhaust valve is provided on the micro diaphragm pump, and the exhaust port of the micro diaphragm pump is connected to the first air chamber of the fixing belt close to the main frame bracket through the exhaust valve.

[0009] Furthermore, each air chamber includes a pair of cavity walls arranged opposite to each other, and there is a gap between the cavity walls of two adjacent air chambers, and the cavity walls of the air chambers can be deformed as the gas is filled.

[0010] Furthermore, the bottoms of the cavity walls between two adjacent air chambers are fixedly connected to form a channel wall, each channel wall is provided with an air hole, and the adjacent air chambers are connected by the air hole.

[0011] Furthermore, the fixing belt further comprises two tail buckles, and the two tail buckles are respectively mounted to one end of the two fixing belts away from the mainframe bracket.

[0012] Furthermore, the fixing belt includes a first portion, a second portion and a third portion, the air chamber arrangement density of the first portion is smaller than the air chamber arrangement density of the second portion, and the air chamber arrangement density of the second portion is smaller than the air chamber arrangement density of the third portion.

[0013] Furthermore, the curvature variation range of the first portion of the fixing belt is 11.6m -1 ~13.4m -1 .

[0014] Furthermore, the curvature variation range of the second portion of the fixing belt is 2.8m -1 ~8.7m -1 .

[0015] Furthermore, the curvature variation range of the third part of the fixing belt is 4.5m -1 ~14.5m -1 .

[0016] Furthermore, the head-mounted device also includes a breathable surface pad, which is installed on the side of the main frame bracket facing the tail buckle.

[0017] Furthermore, the head mounted device further comprises a host and an air pressure sensor. The host is installed in the host housing; the air pressure sensor is installed at the air inlet of the micro diaphragm pump to monitor the air pressure of the air chamber; the air pressure sensor is electrically connected to the host.

[0018] Compared with the prior art, the utility model has at least the following technical effects:

[0019] The utility model provides a head-mounted device, wherein the headband of the head-mounted device adopts a multi-air chamber flexible inflatable headband structure, and the curvature variation range of different parts is controlled by controlling the density of the air chamber arrangement at each part of the headband, so that the deformation degree of different parts of the headband changes in a gradient manner, and the multi-air chamber flexible inflatable headband is inflated by arranging a micro diaphragm pump to deform the headband, so that the head-mounted device can stably wrap the user's head. Through the targeted gradient air chamber arrangement density design, the head-mounted device provided by the utility model can adapt to the head circumferences and head shapes of different users, and obtain good headband system fixing reliability and wrapping feeling. At the same time, this multi-air chamber flexible inflatable headband system has fewer parts, a simple production process and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the overall structure of the head mounted device according to an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the specific structure of the fixing strap of the head mounted device according to an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the initial state structure of the fixing belt according to the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of assembling the fixing belt and the micro diaphragm pump according to an embodiment of the utility model;

[0025] Figure 5 It is a partial structural schematic diagram of the micro diaphragm pump according to an embodiment of the utility model;

[0026] Figure 6 It is a cross-sectional schematic diagram of a partial structure of a micro-diaphragm pump according to an embodiment of the utility model;

[0027] Figure 7 It is a cross-sectional schematic diagram of a partial structure of a fixing belt according to an embodiment of the utility model;

[0028] Figure 8This is a schematic diagram of the air chamber structure of the fixing belt before inflation according to an embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the air chamber structure after the fixing belt described in the embodiment of the utility model is inflated.

[0030] The components in the figure are marked as follows:

[0031] 10 head-mounted device, 11 host bracket, 12 fixing belt, 13 flexible shell, 14 tail buckle; 15 flexible board, 16 micro diaphragm pump, 17 breathable surface pad;

[0032] 121 air chamber, 122 channel wall, 123 air hole, 124 first part, 125 second part; 126 third part, 127 cavity wall, 128 gap;

[0033] 161 exhaust valve, 162 air inlet, 163 exhaust port, 164 motor, 165 exhaust valve; 166 elastic return member, 167 air duct. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. Directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, upper surface, lower surface, side, top surface, bottom, front end, rear end, end, etc., are only directions in the drawings and are only used to explain and illustrate the present invention, but not to limit the scope of protection of the present invention.

[0036] In the drawings, components with the same structure are indicated by the same numerical reference numerals. When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted to" or "connected to" another component, the two may be understood to be directly "mounted" or "connected", or one component may be indirectly "mounted to" or "connected to" another component through an intermediate component.

[0037] like Figure 1-Figure 2As shown, the utility model provides a head-mounted device 10, including a main frame bracket 11, two relatively arranged fixing straps 12, two flexible shells 13 and a micro diaphragm pump 16, and it is defined that when the head-mounted device 10 is worn on the user's head, the direction in which the user's head and face face faces is forward.

[0038] The host bracket 11 is used to install a host (not shown in the figure), which can be a VR host, an AR host and an MR host. In this embodiment, the VR host is taken as an example; the fixing belt 12 includes at least one air chamber 121 and a flexible plate 15, and the air chambers 121 of one fixing belt 12 are arranged in sequence on the surface of the flexible plate 15 of the fixing belt 12 away from the other fixing belt 12; the air chamber 121 is in the shape of a cylinder, and the cross-section of the cylinder is rectangular or trapezoidal. The fixing belt 12 is a flexible inflatable structure with multiple air chambers 121, and the flexible plate 15 can be bent, and the flexible plate 15 can be bent synchronously with the fixing belt 12; two flexible shells 13 are respectively mounted on one fixing belt 12, and the flexible shells 13 can be deformed together with the fixing belt 12.

[0039] like Figure 3 As shown, the two relatively arranged fixing straps 12 of the head-mounted device 10 are initially in a straight state. As more and more gas is filled into the air chamber 121 on the fixing strap 12, the fixing strap 12 begins to deform and gradually bends. When the air chamber 121 on the fixing strap 12 reaches a preset pressure, it is considered that the fixing strap 12 is reliably fixed and inflation is stopped. After inflation, the internal pressure of the structure increases and is in a high-pressure tension state, and the overall rigidity is improved, so that the head-mounted device 10 can be fixed to the user's head through the two relatively arranged fixing straps 12.

[0040] like Figure 4-Figure 6 As shown, the micro-diaphragm pump 16 includes an air inlet 162 and an air outlet 163. The micro-diaphragm pump 16 is installed at one end of the fixing belt 12 facing the main frame bracket 11. An exhaust valve 161 is provided on the micro-diaphragm pump 16. The air inlet 162 of the micro-diaphragm pump 16 is connected to the first air chamber 121 of the fixing belt 12 close to the main frame bracket 11. The micro-diaphragm pump 16 can fill the air into the air chamber 121 on the fixing belt 12, so that the cavity wall 127 of the air chamber 121 can be deformed as the gas is filled, and different parts of the fixing belt 12 are filled with gas. Due to the different arrangement densities of the air chambers 121, the arrangement density of the air chambers 121 changes in a gradient manner, so that the deformation of different parts of the fixing strap 12 also changes in a gradient manner, and finally the two relatively arranged fixing straps 12 wrap around the user's head. An exhaust valve 161 is provided on the micro diaphragm pump 16, and the exhaust port 163 of the micro diaphragm pump 16 is connected to the first air chamber 121 of the fixing strap 12 close to the main frame bracket 11 through the exhaust valve 161. When the head-mounted device 10 needs to be removed from the user's head, the exhaust valve 161 can be manually opened for exhaust.

[0041] In this embodiment, the micro diaphragm pump 16 includes a motor 164, which can control the pump core of the micro diaphragm pump 16 (not shown) to realize the intake and exhaust of the micro diaphragm pump 16. An exhaust valve 165 is installed to the exhaust valve 161 through an elastic reset member 166. One end of the elastic reset member 166 is connected to the exhaust valve 165, and the other end is connected to an airway 167. The elastic reset member 166 is a spring. The air inlet 162 and the exhaust port 163 are both connected to the airway 167. When the micro diaphragm pump 16 is taking in air, the exhaust valve 165 blocks the exhaust port 163 and the airway 167. At this time, only air can be taken in. When the micro diaphragm pump 16 is exhausting, the exhaust valve 165 is pulled to connect the exhaust port 163 with the airway 167, so that exhaust can be carried out.

[0042] Another example Figure 1 As shown, the head-mounted device 10 also includes a breathable surface pad 17, and the breathable surface pad 17 is installed to the side of the main frame bracket 11 facing the tail buckle 14. In this embodiment, the side of the breathable surface pad 17 facing the front is provided with a wrapping shell (not shown) made of the same material as the main frame bracket 11, so that the head-mounted device 10 is more beautiful. Two observation holes (not shown) are provided at the relative arrangement of the breathable surface pad 17 and the lens barrel (not shown) in the main frame bracket 11. The diameter of the observation hole (not shown) is larger than the cross-sectional diameter of the lens barrel (not shown) in the main frame bracket 11 to prevent the breathable surface pad 17 from affecting the user's viewing experience. A nose pad (not shown) is also provided at the bottom of the breathable surface pad 17 to improve the wearing comfort.

[0043] like Figure 7 As shown, each air chamber 12 includes a pair of cavity walls 127 arranged opposite to each other, and there is a gap 128 between the cavity walls 127 of two adjacent air chambers 121. The cavity walls 127 of the air chambers 121 can be deformed as the gas is filled. The bottoms of the cavity walls 127 between the two adjacent air chambers 121 are fixedly connected to form a channel wall 122. Each channel wall 122 is provided with an air hole 123. In this embodiment, the two adjacent air chambers 121 from the first air chamber 121 at the front end of the fixing belt 12 to the last air chamber 121 at the rear end of the fixing belt 12 are connected. The bottoms of the cavity walls 127 between 21 are fixedly connected to form a channel wall 122, and an air hole 123 is provided on the channel wall 122. The adjacent air chambers 121 are connected by the air hole 123. When the micro-diaphragm pump 16 fills gas into the first air chamber 121 at the front end of the fixed belt 12, the gas is filled into each air chamber 121 on the fixed belt 12 through the air hole 123 between the adjacent air chambers 121. As the gas is filled, the cavity walls 127 between the adjacent air chambers 121 squeeze each other and deform, thereby causing the fixed belt 12 to deform.

[0044] like Figure 8 - Fig. 9As shown, the comparison between adjacent air chambers 121 before and after inflation is shown. The bottom of the cavity walls 127 between adjacent air chambers 121 are fixedly connected to form the channel wall 122, and the cavity walls 127 between adjacent air chambers 121 above the channel wall 122 are separated from each other. When gas is filled into the adjacent air chambers 121, the cavity walls 127 between the adjacent air chambers 121 that are separated from each other squeeze each other, so that the distance between the adjacent air chambers 121 becomes larger, and finally the fixing belt 12 is deformed.

[0045] Another example Figure 2 As shown, the fixing strap 12 further includes two tail buckles 14 .

[0046] The two tail buckles 14 are respectively installed to the ends of the two fixing straps 12 away from the main frame bracket 11. In the present embodiment, the tail buckles 14 are installed to the rear end of the fixing strap 12, and the rear end of the fixing strap 12 is fixed to the flexible shell 13 through the tail buckles 14, so that the deformation of the flexible shell 13 and the fixing strap 12 are consistent; the two flexible plates 15 are respectively attached to the opposite sides of the two fixing straps 12, that is, one flexible plate 15 is attached to the side of one fixing strap 12 facing the other fixing strap 12. In the present embodiment, the cross-section of the flexible plate 15 is consistent with the cross-section of the side of the fixing strap 12 facing the other fixing strap 12, so that the flexible plate 15 can be completely attached to the side of the fixing strap 12 facing the other fixing strap 12. The flexible plate 15 is a polymer lining plate, which can increase the wearing comfort.

[0047] Another example Figure 4 As shown, the fixing strap 12 includes a first portion 124, a second portion 125 and a third portion 126, the arrangement density of the air chamber 121 of the first portion 124 is less than the arrangement density of the air chamber 121 of the second portion 125, and the arrangement density of the air chamber 121 of the second portion 125 is less than the arrangement density of the air chamber 121 of the third portion 126. To prevent the second portion 125 of the fixing strap 12 from contacting the user's ear, the size of the fixing strap 12 and the flexible plate 15 of the second portion 125 is designed to be smaller than the size of the fixing strap 12 and the flexible plate 15 of the first portion 124, and the size of the fixing strap 12 and the flexible plate 15 of the second portion 125 is smaller than the size of the fixing strap 12 and the flexible plate 15 of the third portion 126, thereby improving wearing comfort.

[0048] In this embodiment, the flexible plate 15 also includes a first portion 124, a second portion 125 and a third portion 126, which correspond to the first portion 124, the second portion 125 and the third portion 126 of the fixing belt 12. When the curvatures of the first portion 124, the second portion 125 and the third portion 126 of the fixing belt 12 change, the curvatures of the first portion 124, the second portion 125 and the third portion 126 of the flexible plate 15 change synchronously, and the curvature changes of the first portion 124, the second portion 125 and the third portion 126 of the flexible plate 15 are consistent with the curvature changes of the first portion 124, the second portion 125 and the third portion 126 of the fixing belt 12.

[0049] In this embodiment, some of the air chambers 121 located at the same position have the same width in the extension direction of the fixing belt 12, the width of the air chamber 121 in the first position 124 in the extension direction of the fixing belt 12 is greater than the width of the air chamber 121 in the second position 125 in the extension direction of the fixing belt 12, and the width of the air chamber 121 in the second position 125 in the extension direction of the fixing belt 12 is greater than the width of the air chamber 121 in the third position 126 in the extension direction of the fixing belt 12.

[0050] In this embodiment, the extension direction of the channel wall 122 on the flexible plate 15 is defined as the thickness direction, and some air chambers 121 located at the same position are consistent in the thickness direction. The thickness of the air chamber 121 in the first position 124 in the thickness direction is greater than the thickness of the air chamber 121 in the second position 125 in the thickness direction, and the thickness of the air chamber 121 in the third position 126 in the thickness direction is greater than the thickness of the air chamber 121 in the second position 125 in the thickness direction.

[0051] In this embodiment, the arrangement density of the air chamber 121 is related to the curvature variation range of the first part 124, the second part 125 and the third part 126 of the fixing belt 12. After the gas is exhausted from the air chamber 121, the curve of the entire fixing belt 12 is its natural curvature curve. This curvature is determined by the mold when manufacturing the fixing belt 12. After the air chamber 121 is inflated, the headband bends. This is because the air chambers 121 squeeze each other after expansion, resulting in different elongation amounts on the inner and outer sides of the fixing belt 12, that is, the elongation amounts of the cavity wall 127 and the channel wall 122 between two adjacent air chambers 121 are different, forcing the fixing belt 12 to bend.

[0052] The curvature variation range of the first portion 124 of the fixing belt 12 is 11.6m -1 ~13.4m -1 The curvature of the second portion 125 of the fixing belt 12 varies within a range of 2.8m -1 ~8.7m -1 The curvature of the third portion 126 of the fixing belt 12 varies within a range of 4.5m -1~14.5m -1 .

[0053] Another example Figure 4 As shown, in the present embodiment, the arrangement density of the air chambers 121 in the first portion 124 of the fixing belt 12 is the sparsest, the arrangement density of the air chambers 121 in the second portion 125 of the fixing belt 12 is of medium density, and the arrangement density of the air chambers 121 in the third portion 126 of the fixing belt 12 is the densest. The initial lengths of the first portion 124, the second portion 125 and the third portion 126 are the same. In the portion where the air chambers 121 are sparsely arranged, the length change values ​​of the inner and outer sides of the fixing belt 12 are relatively small, and in the portion where the air chambers 121 are densely arranged, the length change values ​​of the inner and outer sides of the fixing belt 12 are greatly different. The reason is that the denser the arrangement of the air chambers 121, the more cavity walls 127 of the air chambers 121 that are deformed, and the greater the curvature change.

[0054] Therefore, by comparing the curvature changes of the first portion 124, the second portion 125 and the third portion 126 of the fixing belt 12, it can be found that the curvature change of the first portion 124 is 13.4 m -1 -11.6m -1 =1.8m -1 The curvature change of the second part 125 is 8.7m -1 -2.8m -1 =4.9m -1 The curvature change of the third part 126 is 14.5m -1 -4.5m -1 =10m -1 It can be found that the curvature change is positively correlated with the arrangement density of the air chamber 121, so the deformation degree of the first part 124 of the fixing belt 12 is smaller than the deformation degree of the second part 125 of the fixing belt 12, and the deformation degree of the second part 125 of the fixing belt 12 is smaller than the deformation degree of the third part 126 of the fixing belt 12. Therefore, after the two relatively arranged fixing belts 12 are deformed, the tail ends of the two relatively arranged fixing belts 12 can be close to each other, so that the head-mounted device 10 can be stably worn on the user's head.

[0055] In this embodiment, the head-mounted device 10 also includes an air pressure sensor (not shown in the figure), which is installed at the air inlet 162 of the micro-diaphragm pump 16 to monitor the air pressure of the air chamber 121; the air pressure sensor (not shown in the figure) is electrically connected to the host (not shown in the figure), and the air pressure sensor (not shown in the figure) can monitor the pressure inside the air chamber 121 on the fixing strap 12 in real time. When the pressure inside the air chamber 121 reaches a preset threshold, the micro-diaphragm pump 16 will stop inflating. The micro-diaphragm pump 16 and the air pressure sensor (not shown in the figure) are controlled by the host (not shown in the figure), so that adaptive intelligent adjustment of the fixing strap 12 of the head-mounted device 10 can be achieved.

[0056] The advantage of the present application is that the utility model provides a head-mounted device, and the headband part of the head-mounted device adopts a multi-air chamber flexible inflatable headband structure, and the curvature change range of different parts is controlled by controlling the air chamber arrangement density of each part of the headband, so that the deformation degree of different parts of the headband changes in a gradient manner, and the multi-air chamber flexible inflatable headband is inflated by arranging a micro diaphragm pump to make the headband deform, so that the head-mounted device can stably wrap the user's head, and through the targeted gradient air chamber arrangement density design, the head-mounted device provided by the utility model can adapt to the head circumferences and head shapes of different users, and obtain good headband system fixing reliability and wrapping feeling. At the same time, this multi-air chamber flexible inflatable headband system has fewer parts, a simple production process and low cost.

[0057] The head-mounted device provided by an embodiment of the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the utility model. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A head mounted device, characterized in that: include: Host bracket; Two oppositely arranged fixing belts, comprising at least one air chamber and a flexible plate, wherein the air chamber of one fixing belt is sequentially arranged on the surface of the flexible plate of the fixing belt away from the other fixing belt; the shape of the air chamber is a column, the cross section of the column is a rectangle or a trapezoid, and the flexible plate can be bent; Two flexible shells are respectively mounted on a fixing belt, and the flexible shells can be deformed together with the fixing belt; as well as The micro diaphragm pump comprises an air inlet and an exhaust port. The micro diaphragm pump is installed on one end of the fixing belt facing the main frame bracket. An exhaust valve is provided on the micro diaphragm pump. The exhaust port of the micro diaphragm pump is connected to the first air chamber of the fixing belt close to the main frame bracket through the exhaust valve.

2. The head mounted device according to claim 1, wherein: Each air chamber includes a pair of cavity walls arranged opposite to each other, and there is a gap between the cavity walls of two adjacent air chambers. The cavity walls of the air chambers can be deformed as the gas is filled.

3. The head mounted device according to claim 1, wherein: The bottoms of the cavity walls between two adjacent air chambers are fixedly connected to form a channel wall. Each channel wall is provided with an air hole, and the adjacent air chambers are connected by the air hole.

4. The head mounted device according to claim 1, wherein: The fixing belt also includes The two tail buckles are respectively installed on the ends of the two fixing belts away from the main frame bracket.

5. The head mounted device according to claim 1, wherein: The fixing belt includes a first portion, a second portion and a third portion, the air chamber arrangement density of the first portion is smaller than the air chamber arrangement density of the second portion, and the air chamber arrangement density of the second portion is smaller than the air chamber arrangement density of the third portion.

6. The head mounted device according to claim 5, wherein: The curvature variation range of the first part of the fixing belt is 11.6m -1 ~13.4m -1 .

7. The head mounted device according to claim 5, wherein: The curvature variation range of the second part of the fixing belt is 2.8m -1 ~8.7m -1 .

8. The head mounted device according to claim 5, wherein: The curvature variation range of the third part of the fixing belt is 4.5m -1 ~14.5m -1 .

9. The head mounted device according to claim 4, wherein: Also includes A breathable surface pad is installed on a side of the main frame bracket facing the tail buckle.

10. The head mounted device according to claim 1, wherein: Also includes A host, installed in the host housing; and An air pressure sensor is installed at the exhaust port of the micro-diaphragm pump to monitor the air pressure of the air chamber; The air pressure sensor is electrically connected to the host.

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