Head-mounted display

Abstract

The present invention discloses a head-mounted display, which belongs to the technical field of visual display equipment, and includes a host shell, wherein a receiving cavity is provided in the host shell, and an air inlet unit and an air outlet unit connected to the receiving cavity are respectively provided at the upper and lower parts of the host shell, and a cooling fan is provided in the receiving cavity, and the cooling fan is located between the air inlet unit and the air outlet unit, and the air suction direction of the cooling fan is from top to bottom. The present invention utilizes the cooling fan of the head-mounted display, and sets the air suction direction of the cooling fan to be from top to bottom. The vertical upward lift generated by the cooling fan can offset part of the gravity, thereby reducing the pressure of the head-mounted display on the user's cervical spine and improving the user experience; and it ensures the battery life and ease of use without increasing the cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of visual display equipment, and in particular relates to a head mounted display. Background Art

[0002] Head-mounted displays are devices used to display images and colors, usually in the form of eye masks or helmets, with the display screen close to the user's eyes, and the focus is adjusted through the optical path to project the image to the eyes at a close distance. However, existing head-mounted displays are very bulky, and wearing them for a long time will make the user's cervical spine difficult to bear, greatly reducing the user experience.

[0003] In order to reduce weight, there are various designs, mainly the following methods: one is to reduce the absolute weight, but it will affect the battery capacity and battery life; the second is weight balance, separate the battery from the body, and move the battery to the back of the head. Although the front and back forces are balanced, the overall weight is not reduced; the third is weight sharing, designing the battery at the waist, but it is necessary to connect the battery and the body with a wire, which is very inconvenient.

[0004] Therefore, how to reduce the pressure of the head-mounted display on the user's cervical spine and improve the user experience without reducing battery life, affecting ease of use, or increasing costs has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0005] In view of the above problems, the technical problem to be solved by the present invention is: to provide a head-mounted display that can reduce the pressure of the head-mounted display on the user's cervical spine, improve the user experience, and ensure battery life and ease of use without increasing costs.

[0006] To solve the above technical problems, the technical solution of the present invention is: a head-mounted display, including a host shell, a accommodating cavity is provided in the host shell, the upper and lower parts of the host shell are respectively provided with an air inlet unit and an air outlet unit connected to the accommodating cavity, a cooling fan is provided in the accommodating cavity, the cooling fan is located between the air inlet unit and the air outlet unit, and the air suction direction of the cooling fan is from top to bottom.

[0007] As an improvement, the heat dissipation fan comprises a fan frame and at least one fan wheel pivotally connected to the fan frame, the fan wheel comprises a hub and a plurality of blades, the blades rotate around the center of the hub, and a mounting hole is provided on the hub;

[0008] Each of the blades includes an air inlet edge close to the air inlet unit, an air outlet edge close to the air outlet unit, a blade root close to the hub, and a blade tip opposite to the blade root; along the air outlet direction, the blade root gradually descends from the air inlet edge to the air outlet edge, and the blade tip gradually descends from the air inlet edge to the air outlet edge.

[0009] As a further improvement, a shock-absorbing pad is provided between the fan frame and the inner wall of the main body shell.

[0010] As a further improvement, the shock-absorbing pad is a rubber pad.

[0011] As an improvement, the air inlet unit includes a plurality of air inlet holes arranged at intervals, and the air inlet holes are opened in the main unit housing.

[0012] As a further improvement, the air inlet unit also includes a first filter element arranged at the air inlet hole.

[0013] As an improvement, the air outlet unit includes a plurality of air outlet holes arranged at intervals, and the air outlet holes are opened in the main body shell.

[0014] As a further improvement, the air outlet unit further includes a second filter element arranged at the air outlet.

[0015] As an improvement, a heating element is arranged in the accommodating cavity, and the heat dissipation fan is located below the heating element.

[0016] As a further improvement, there are three impellers, three air inlet units and three air outlet units respectively, and each impeller is provided corresponding to one air inlet unit and one air outlet unit.

[0017] After adopting the above technical solution, the beneficial effects of the present invention are:

[0018] The head mounted display provided by the present invention has an air inlet unit and an air outlet unit respectively arranged at the upper and lower parts of the main body shell, and the air suction direction of the cooling fan is improved from the traditional side suction to the top to the bottom. Therefore, when the cooling fan is running at a high speed, the reaction force generated can offset part of the gravity, thereby reducing the pressure of the head mounted display on the user's cervical spine and improving the user experience; at the same time, the absolute weight of the head mounted display is not changed, thereby ensuring the battery capacity and battery life of the head mounted display; there is no need to separate the battery from the main body, thereby ensuring the convenience of use; at the same time, the cost is not increased.

[0019] Since a shock-absorbing pad is arranged between the fan frame and the inner wall of the main body shell, the noise and vibration of the cooling fan during operation can be reduced, further improving the user experience.

[0020] Since the air inlet unit includes a plurality of air inlet holes arranged at intervals, and the air outlet unit includes a plurality of air outlet holes arranged at intervals, the flow of air is fully guaranteed.

[0021] Since the air inlet unit also includes a first filter element arranged at the air inlet hole, and the air outlet unit also includes a second filter element arranged at the air outlet hole, dust and other impurities in the external space can be effectively prevented from entering the main unit housing, thereby effectively protecting the components in the main unit housing.

[0022] Since the heat dissipation fan is located below the heating element, the heat dissipation of the heating element can be fully guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 An exploded view of the headset (the headband of the head-mounted display is omitted in the figure);

[0025] Figure 3a yes Figure 2 A magnified view of the middle air inlet unit;

[0026] Figure 3b yes Figure 1 A magnified view of the middle exhaust unit;

[0027] Figure 4 It is a schematic diagram of the structure of the fan wheel of the cooling fan;

[0028] Figure 5 It is a schematic structural diagram of the fan wheel of the cooling fan from another perspective;

[0029] Figure 6 It is a three-dimensional diagram of a fan wheel of a cooling fan;

[0030] In the figure: 1-main body shell, 101-front shell, 102-middle shell, 103-rear shell, 11-accommodating chamber, 12-air inlet unit, 121-air inlet hole, 13-air outlet unit, 131-air outlet hole, 2-cooling fan, 21-fan frame, 22-fan wheel, 221-hub, 222-blade, 2221-air inlet edge, 2222-air outlet edge, 2223-blade root, 2224-blade tip, 2225-pressure surface, 3-circuit board, 4-headband.

[0031] Figure 1 The dashed arrows in the figure represent the direction of wind flow. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The terms "upper", "lower", "front" and "back" described below are defined based on the orientation of the head mounted display when in use. The side of the head mounted display closer to the face of a person is defined as the back side, and the side farther from the face of a person is defined as the front side.

[0034] like Figure 1 , Figure 2 , Figure 3a , Figure 3b , Figure 4 , Figure 5 and Figure 6 As shown together, a head mounted display comprises a main body shell 1 and a headband 4. A receiving cavity 11 is provided in the main body shell 1, and an air inlet unit 12 and an air outlet unit 13 connected to the receiving cavity 11 are respectively provided at the upper and lower parts of the main body shell 1, and a heat dissipation fan 2 is provided in the receiving cavity 11, and the heat dissipation fan 2 is located between the air inlet unit 12 and the air outlet unit 13, and the air suction direction of the heat dissipation fan 2 is from top to bottom.

[0035] In this embodiment, for the convenience of assembly, the host housing 1 includes a front housing 101, a middle housing 102 and a rear housing 103, which together surround a receiving space 11. Of course, the middle housing 102 and the rear housing 103 of the host housing 1 are also configured as one body, or the host housing 1 is designed in other ways, which will not be described in detail here.

[0036] In the prior art, the cooling fan sucks air from the side, that is, the axial direction of the cooling fan 2 is in the horizontal direction. In the embodiment of the present invention, the cooling fan 2 sucks air from the side to from top to bottom, so that when the cooling fan 2 runs at high speed, the reaction force generated can offset part of the gravity, thereby reducing the pressure of the head mounted display on the user's cervical spine and improving the user experience.

[0037] In order to ensure the uniformity of air flow, the air inlet unit 12 includes a plurality of air inlet holes 121 arranged at intervals, and the air inlet holes 121 are opened in the main body housing 1. The air outlet unit 13 includes a plurality of air outlet holes 131 arranged at intervals, and the air outlet holes 131 are opened in the main body housing 1. In the present embodiment, the air inlet holes 121 and the air outlet holes 131 are both circular holes, and the plurality of air inlet holes 121 are distributed in a long strip shape, and the plurality of air outlet holes 131 are distributed in a circular shape. It should be noted that the shape, number and distribution form of the air inlet holes 121 and the air outlet holes 131 can be selected by those skilled in the art according to actual needs, and will not be described in detail here.

[0038] In order to prevent dust and other impurities in the external space from entering the main housing 1 and effectively protect the components in the main housing 1, the air inlet unit 12 also includes a first filter element (not shown in the figure) arranged at the air inlet hole 121. The air outlet unit 13 also includes a second filter element (not shown in the figure) arranged at the air outlet hole 131. The first filter element and the second filter element can be arranged inside the main housing 1 to maintain the beauty of the main housing 1; they can also be arranged outside the main housing 1 for easy disassembly. The first filter element and the second filter element are preferably multi-layer filter nets. Of course, the first filter element and the second filter element can also be selected from filter cotton, etc., which are well known to those skilled in the art and will not be repeated here.

[0039] Preferably, a heating element is provided in the accommodating cavity 11, and the heating element includes a circuit board 3 and a battery, etc., and the cooling fan 2 is located below the heating element. Since the head-mounted display requires scene rendering and reconstruction, which involves a large amount of data calculation, the heating element emits a large amount of heat. The cooling fan 2 is arranged below the heating element to fully ensure the heat dissipation of the heating element. Of course, as an alternative, the cooling fan 2 can also be arranged above the heating element or at other locations as needed.

[0040] In order to ensure a good heat dissipation effect and reduce the pressure on the cervical spine when worn, in this embodiment, the heat dissipation fan 2 includes a fan frame 21 and three fan wheels 22 pivotally connected to the fan frame 21. Correspondingly, there are three air inlet units 12 and three air outlet units 13, respectively, and each fan wheel 22 is provided corresponding to one air inlet unit 12 and one air outlet unit 13. Of course, the number of fan wheels 22 is not limited to three, and those skilled in the art can select them according to actual conditions.

[0041] Combination Figures 4 to 6 As shown, the impeller 22 includes a hub 221 and three blades 222. Of course, the number of blades 222 is not limited to three, and those skilled in the art can choose according to actual conditions. The blades 222 rotate around the center of the hub 221, and a mounting hole (not shown in the figure) is provided on the hub 221; each blade 222 includes an air inlet edge 2221 close to the air inlet unit 12, an air outlet edge 2222 close to the air outlet unit 13, a blade root 2223 adjacent to the hub 221, and a blade tip 2224 opposite to the blade root 2223; along the air outlet direction, the blade root 2223 gradually descends from the air inlet edge 2221 to the air outlet edge 2222, and the blade tip 2224 gradually descends from the air inlet edge 2221 to the air outlet edge 2222.

[0042] It should be noted that the blade surface that can be seen when observing the cooling fan from the upstream position before the fluid is sucked into the cooling fan is defined as the pressure back side, and the blade surface that cannot be seen from the reverse side is defined as the pressure surface 2225. In this way, when the cooling fan rotates, the fluid on the upstream side flows to the downstream side under the action of the pressure difference caused by the pressure back side and the pressure surface 2225 of the blade 222. When the impeller 22 rotates, the air passes through the pressure surface 2225 of the blade 222 from the air inlet edge 2221 and leaves the blade 222 from the air outlet edge 2222, that is, as the cooling fan rotates, the air on the upper side of the cooling fan flows to the lower side. When the cooling fan 2 is running at high speed, the reaction force generated can offset part of the gravity, thereby reducing the pressure of the head-mounted display on the user's cervical spine and improving the user experience. Among them, the theoretical calculation of the cooling fan to offset part of the gravity can refer to the propeller thrust calculation formula:

[0043] Diameter (m) × pitch (m) × propeller width (m) × speed square (r / s) × 1 atmospheric pressure (1 standard atmospheric pressure) × empirical coefficient (0.25) = pulling force (kg);

[0044] Or diameter (cm) × pitch (cm) × paddle width (cm) × rotation speed square (rev / s) × 1 atmospheric pressure (1 standard atmospheric pressure) × empirical coefficient (0.00025) = tension (g).

[0045] The premise is that the slurry of universal proportion has good precision and the atmospheric pressure is 1 standard atmosphere. If it is in plateau area, the atmospheric pressure should be reduced and the pressure should be 0.6-0.7 standard atmosphere. Below 1000 meters, 1 standard atmosphere can be used.

[0046] For example: atmospheric pressure is 1 standard atmosphere. Figures 4 to 6 The fan wheel 22 shown has a blade 222 with a diameter D of 4 cm, a pitch P of 0.6 cm, and a maximum width W of 2 cm. Generally, the operating speed of a cooling fan is 3000-6000 rpm, i.e., 50-100 rpm. The calculation yields:

[0047] 4 (cm) × 0.6 (cm) × 2 (cm) × 50 2 (revolutions / second) × 1 (1 standard atmospheric pressure) × 0.00025 = 3 grams;

[0048] 4 (cm) × 0.6 (cm) × 2 (cm) × 100 2 (revolutions / second)×1(1 standard atmospheric pressure)×0.00025=12 grams.

[0049] The lift of one blade is between 3 grams and 12 grams. A fan wheel 22 of the cooling fan has three blades, with a lift of about 9 grams to 36 grams. In this embodiment, the three fan wheels can reduce the weight by about 27 grams to 108 grams, which greatly reduces the pressure relative to the total weight of 300-600 grams of the whole machine.

[0050] It should be noted that the structure of the impeller is not limited to the above structure, and other structures may also be adopted, which will not be described in detail here.

[0051] In order to reduce the noise and vibration of the cooling fan 2 during operation and further improve the user experience, a shock-absorbing pad (not shown in the figure) is arranged between the fan frame 21 and the inner wall of the host housing 1. Preferably, the shock-absorbing pad is a rubber pad. Of course, the shock-absorbing pad can also be selected from other methods such as sponge pads, which will not be described here.

[0052] The head mounted display provided in the embodiment of the present invention may be VR (Virtual Reality) glasses or AR (Augmented Reality) glasses, etc.

[0053] In summary, the head-mounted display provided in the embodiment of the present invention utilizes the cooling fan of the head-mounted display to change the air suction direction of the cooling fan to suction from top to bottom. The vertical upward lift generated by the cooling fan can offset part of the gravity, thereby reducing the pressure of the head-mounted display on the user's cervical spine and improving the user experience; and the battery life and ease of use are guaranteed without increasing the cost.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A head mounted display, comprising a main housing, characterized in that: The host housing is provided with a receiving chamber, the upper part and the lower part of the host housing are respectively provided with an air inlet unit and an air outlet unit connected with the receiving chamber, a heat dissipation fan is provided in the receiving chamber, the heat dissipation fan is located between the air inlet unit and the air outlet unit, and the air suction direction of the heat dissipation fan is from top to bottom; The host housing comprises a front shell, a middle shell and a rear shell, wherein the front shell, the middle shell and the rear shell together surround and form the accommodating cavity, and the air inlet unit and the air outlet unit are correspondingly arranged on the middle shell from top to bottom; The heat dissipation fan comprises a fan frame and at least one fan wheel pivotally connected to the fan frame, and each fan wheel is arranged corresponding to one of the air inlet units and one of the air outlet units; The air inlet unit comprises a plurality of air inlet holes arranged at intervals, the air inlet holes are opened on the middle shell of the main body shell, and the air inlet unit further comprises a first filter element arranged at the air inlet holes; The air outlet unit includes a plurality of air outlet holes arranged at intervals, the air outlet holes are opened on the middle shell of the main body shell, and the air outlet unit also includes a second filter element arranged at the air outlet holes.

2. The head mounted display according to claim 1, characterized in that: The fan wheel comprises a hub and a plurality of blades, the blades rotate around the center of the hub, and a mounting hole is provided on the hub; Each of the blades includes an air inlet edge close to the air inlet unit, an air outlet edge close to the air outlet unit, a blade root close to the hub, and a blade tip opposite to the blade root; Along the wind outlet direction, the blade root gradually descends from the wind inlet edge to the wind outlet edge, and the blade tip gradually descends from the wind inlet edge to the wind outlet edge.

3. The head mounted display according to claim 2, characterized in that: A shock-absorbing pad is arranged between the fan frame and the inner wall of the main body shell.

4. The head mounted display according to claim 3, characterized in that: The shock-absorbing pad is a rubber pad.

5. The head mounted display according to claim 1, characterized in that: A heating element is arranged in the accommodating cavity, and the heat dissipation fan is located below the heating element.

6. The head mounted display according to claim 1, characterized in that: There are three impellers, three air inlet units and three air outlet units respectively.

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