CN114114695A

CN114114695A - Face guard and nearly eye display device

Info

Publication number: CN114114695A
Application number: CN202111500276.2A
Authority: CN
Inventors: 李健; 孙菽弦; 段家喜; 侯伟洪
Original assignee: Beijing Ned+ Ar Display Technology Co ltd
Current assignee: Beijing Ned+ Ar Display Technology Co ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-03-01

Abstract

The invention discloses a face mask and near-to-eye display equipment, wherein the face mask comprises: a bracket made of a first material and having a first face remote from a human face and a second face proximate to the human face; a first light-transmitting sheet and a second light-transmitting sheet, each made of a second material, the first material being different from the second material; the first light-transmitting sheet is arranged on the first surface of the bracket, and the second light-transmitting sheet is arranged on the second surface of the bracket; the first light transmission piece, the second light transmission piece and the support form a mask with an opening on the upper side. The mask provided by the invention is used for accommodating the optical module, and the two light transmitting sheets are supported by the support with higher strength, so that the visual mask capable of transmitting ambient light is formed, and the structural strength of the whole near-to-eye display equipment is improved. Through testing, the near-eye display equipment can meet the falling prevention requirement of falling from the high altitude of at least 2 meters without damage. The near-eye display device can be applied to the field of augmented reality.

Description

Face guard and nearly eye display device

Technical Field

The invention relates to a mask and also relates to a near-eye display device comprising the mask.

Background

The near-eye display device is the most important device in Augmented Reality (AR) and Virtual Reality (VR) applications, and is used for enlarging and projecting a picture of a micro display screen arranged near the head in front of human eyes. In the augmented reality application, the environment scene needs to be simultaneously viewed.

Near-eye display equipment, except that the requirement satisfies optical display performance index, also have higher requirement to volume, weight etc to, even very notice when using, also can have the risk of falling because optical components and parts precision degree is higher and fragile, consequently, also have the requirement to preventing unexpected falling damage.

AR reality near-to-eye display device because it not only is used for showing the virtual image of miniature display screen, still is used for simultaneously to environmental image perspective formation of image, consequently adopts perspective type optical module frequently.

The application scenarios of AR near-eye display devices are more complex than VR near-eye display devices. For example, in the field of industrial work or other special occasions, there is a higher demand for fall protection. However, the existing near-to-eye display equipment is generally general in drop resistance, the protective cover is easy to damage and destroy, the drop of about 1 meter can be met, and the requirement for higher drop prevention cannot be met.

Disclosure of Invention

The invention aims to provide a mask.

Another object of the present invention is to provide a near-eye display device including a mask.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

according to a first aspect of embodiments of the present invention, there is provided a mask for a near-eye display device, comprising:

a bracket made of a first material and having a first face remote from a human face and a second face proximate to the human face; and

a first light-transmitting sheet and a second light-transmitting sheet, each made of a second material, the first material being different from the second material;

the first light-transmitting sheet is arranged on the first surface of the bracket, and the second light-transmitting sheet is arranged on the second surface of the bracket; the first light transmission piece, the second light transmission piece and the support form a mask with an upper opening.

Optionally, the stent comprises:

the bottom plate is provided with an inner side close to the human face and an outer side far away from the human face;

the two side plates extend upwards from two sides of the bottom plate respectively, and the inner side contour of the bottom plate and the side plates limit the second surface of the bracket; and

the first connecting beam is used for connecting the top ends of the two side plates and has a shape close to the outer contour of the bottom plate; the bottom plate outer profile, the side plates and the first connecting beam together define a first face of the bracket.

Optionally, the floor medial contour covers at least the orbital area of the face front.

Optionally, the bottom plate inner side contour covers the front face of the human face and the part between the side face of the human face and the human ear.

Optionally, the first connecting beam is an arc beam.

Optionally, the first connecting beam has a portion beyond the first light-transmitting sheet in the viewing axis direction.

Optionally, the bracket further comprises a second connecting beam which is used for connecting top ends of the two side plates and has a shape close to the inner contour of the bottom plate; the bottom plate inner profile, the side plate and the first connecting beam together define a second face of the bracket.

Optionally, a recess is provided in the base plate adjacent the second face, the recess being for forming a nose pad.

Optionally, the strength of the first material is higher than the strength of the second material; alternatively, the toughness of the first material is higher than the toughness of the second material.

Optionally, the first material is a metal material, or the first material is a plastic with a higher yield strength than the second material.

Optionally, the second material is an optical material, and the first and second light transmissive sheets have no optical power.

According to a second aspect of embodiments of the present invention, there is provided a near-eye display device comprising:

the above mask; and

the shell is used for containing and fixing the optical module, and the shell is connected with the mask.

The mask provided by the invention is used for accommodating the optical module, and the mask capable of transmitting ambient light is formed by arranging the bracket and the two light transmitting sheets, wherein the bracket with higher strength is used, so that the structural strength of the whole near-to-eye display equipment is improved. Through testing, the near-eye display equipment can at least meet the falling prevention requirement without damage when falling from the high altitude of at least 2 meters.

Drawings

Fig. 1 is a schematic structural diagram of a near-eye display device provided in a first embodiment;

FIG. 2 is a schematic view showing the overall structure of the mask in the first embodiment;

FIG. 3 is an exploded view of the mask of the first embodiment;

fig. 4 is a schematic view of the structure of a mask according to a second embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present disclosure, it should be noted that the term "connected" is to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected through an intermediate medium. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.

For the purpose of facilitating understanding of the embodiments of the present application, the following description will be made in terms of specific embodiments with reference to the accompanying drawings, which are not intended to limit the embodiments of the present application.

The invention provides a near-eye display device, which is mainly used for augmented reality application and comprises a shell and a mask which are arranged on the front side of a head, and also comprises a headband (comprising a soft headband or a hard headband which is not shown), wherein the shell can be fixed on the outer part of the head of a human body or a helmet through the headband.

Hereinafter, the orientation of the near-eye display device when worn on the head of a human body will be explained, with the side facing the head as the inside and the side away from the head as the outside.

Specifically, as shown in fig. 1, the orientation of fig. 1 will be described by taking the orientation when the user wears the device as an example. The near-eye display device comprises a shell 10 at the upper part and a face mask 20 arranged below the shell 10, wherein the upper end of the face mask 20 is fixedly connected with the shell 10 to form a shell for containing an optical module.

As shown in fig. 2 and 3, in this embodiment, the cover 20 includes a support 21, a first light transmissive sheet 22, and a second light transmissive sheet 23. A frame 21 made of a first material and having a first face 21A remote from the face of a person and a second face 21B adjacent to the face of a person; the first and second light-transmitting

sheets

22 and 23 are made of a second material, the first material being different from the second material; the first light-transmitting sheet 22 is arranged on the first surface 21A of the bracket 21, and the second light-transmitting sheet 23 is arranged on the second surface 21B of the bracket 21; the holder 21, the first light transmitting sheet 22, and the second light transmitting sheet 23 are combined to form a viewing mask having an opening on one side (shown as an opening on the upper side), and ambient light is transmitted through the viewing axis direction.

The bracket 21 includes a bottom plate 210, a side plate 211 and a connecting beam 215, and the bracket 21 may be integrally formed from the same material, or may be separately processed from the same material, for example, the bottom plate 210 and the side plate 211 are integrally formed, the connecting beam 215 is separately processed, and then the two are fixed. Next, the structure of the holder 21 will be described with the side close to the face as the inside and the side away from the face as the outside.

The face mask 20 covers the face of the person and is not limited to the face of the person but covers at least the orbital portion of the face of the person. In this embodiment, the face mask covers the front and sides of the face, covering the area of the face between the ears. The inner side of the bottom plate 210 has an arc shape conforming to the contour of the face of a person, and the outer side of the bottom plate 210 has an arc shape to cover the same area as the inner side. The bottom plate 210 has a certain width on a horizontal or slightly inclined plane, in this embodiment, the bottom plate 210 has a width varying from the middle to both sides, and in other embodiments, the width of the bottom plate 210 may be maintained constant.

The parts of the bottom plate 210 positioned at both sides of the human eyes are respectively provided with a side plate (211 and 212) extending upwards, and the top ends of the side plate 211 and the side plate 212 are flush. The connection beam 215 connects the top ends of the two

side plates

211 and 212, respectively, and the connection beam 215 has an arc shape identical or close to the outer profile shape of the base plate 210. In this embodiment, the connecting beam 25 is an arc beam. The width of the connecting beam 215 in the vertical direction is not limited, and may be wide or narrow, and may be designed according to the specific structure of the near-eye display device.

The bottom plate 210, the

side plates

211 and 212 and the connection beam 215 constitute a frame, and a passage for external light to enter human eyes is formed between the bottom plate 210, the side plates 211, the side plates 212 and the connection beam 215.

As shown in fig. 3, the bracket 21 has a first face 21A away from the human face and a second face 21B fitting the human face, wherein the outer contour of the bottom plate 210, the outer contours of the two

side plates

211 and 212, and the connecting beam 215 together define the first face 21A; the inner contour of the bottom panel 210 and the inner contours of the two

side panels

211 and 212 together define a second face 21B, the second face 21B being shaped to conform to the human face.

The first light-transmitting sheet 22 is disposed on the first surface 21A (the side away from the human face) of the bracket 21, the bottom of the first light-transmitting sheet 22 is connected to the outer contour of the bottom plate 210, the side of the first light-transmitting sheet 22 is connected to the outer contours of the two

side plates

211 and 212, respectively, and the upper portion of the first light-transmitting sheet 22 is connected to the connecting beam 215.

The second light-transmitting sheet 23 is disposed on the second surface 21B (the side close to the human face) of the frame 21, the bottom of the second light-transmitting sheet 23 is connected to the inner contour of the bottom plate 210, and the side of the second light-transmitting sheet 23 is connected to the inner contours of the two

side plates

211 and 212, respectively.

The first and second light-transmitting

sheets

22 and 23 are sealed with respect to the holder 21. The holder 21, the first light transmission sheet 22 and the second light transmission sheet 23 constitute a cover (see fig. 2) having an upper opening defined by an upper end of the first light transmission sheet 22, an upper end of the second light transmission sheet 23, an upper end of the side plate 211, an upper end of the side plate 212 and the connection beam 215. The inside part that is used for holding the optical module and stretches into wherein of face guard, the part that the optical module stretches into in the face guard should see through ambient light to realize augmented reality's application.

Wherein the bracket 21 is made of a first material; the first light-transmitting sheet 22 and the second light-transmitting sheet 23 are made of a second material, respectively; the strength of the first material is higher than the hardness of the second material, so that the structural strength of the whole near-eye real device shell is improved by using a support with higher strength.

In order to meet the requirement of 2 m high-altitude falling prevention of near-eye display equipment, the inventor of the application performs simulation tests on a large number of existing near-eye display equipment, calculates the gravity center position of each test sample, and records the vulnerable area of each near-eye display equipment. As a result, it was found that: when the near-eye display equipment falls from a height of 2 meters, the landing points of the near-eye display equipment are concentrated on the area of the bottom of the mask and the part of the outer side of the mask, which is connected with the upper shell, and the parts are concentrated on stress of the near-eye display equipment.

To this end, the inventors have developed an improvement to the face mask in an AR near-eye display device, which improves the conventional one-piece face mask or two-piece split face mask into a three-piece split face mask 20: the display device comprises a support 21 and two light-transmitting

sheets

22 and 23, and the structure of the support 21 is designed, so that the support 2 can completely cover a plurality of vulnerable points, the structural strength of the whole near-to-eye display device is enhanced, and the falling-preventing performance is improved. Specifically, the bottom of the mask is replaced by the bottom plate made of the second material, the side plate made of the second material is arranged, and the connecting beam is arranged on the side, away from the face, of the mask, so that the structural performance of the whole mask is enhanced.

Alternatively, the holder 21, the light-transmitting sheet 22 and the light-transmitting sheet 23 may be glued together, or may be fixedly assembled by being locked together on the basis of gluing. Therefore, the normal use of the AR head-mounted display system is met, and meanwhile the falling resistance of the whole machine is well enhanced.

In a 2 m high-altitude complete machine drop test, the drop point can be verified to be the position of the support 21 in the mask, the optical PC material of the complete machine is not damaged, and the mask is not damaged.

In this mask, the strength of the first material for making the support 21 is higher than that of the second material for making the two light-transmitting

sheets

22 and 23, and preferably, the toughness of the first material is also higher than that of the second material. For example, a metal material such as an aluminum alloy, an aluminum magnesium alloy, or a titanium alloy having a low density can be used as the first material, and a translucent plastic such as PC can be used as the second material. As another example, a plastic with a higher strength and/or toughness than the second material may also be used for the first material, such as a carbon fiber material or an ABS engineering plastic. The choice of the first material is only schematically listed here and is not limiting.

For example, in this embodiment, the bracket 21 is made of an Al alloy and the two

light transmissive sheets

22 and 23 are made of an optical grade PC material. The density of the aluminum is 2.7g/cm³1/3, which is about the density of copper or iron, is a good material for weight reduction. The mechanical property of aluminium is not as good as that of steel, but its specific strength is high, and it can be made into aluminium alloy by adding alloy elements of copper, magnesium, manganese and chromium, etc., and then through heat treatment, so that it can obtain very high strength. For the head-mounted near-eye display equipment with higher important requirements (light weight is required), Al alloy is a better choice, and can be combined with an optical PC material through the aluminum alloy, so that the mask made of the PC material can be kept largeTo the same weight. The aluminum alloy has good oxidation effect and better overall appearance effect. Further, aluminum has excellent ductility, and is easily extruded into a hollow material having a complicated shape, and is suitable for drawing and other various cold and hot plastic forming.

Preferably, in order to secure the imaging effect of the near-eye display device, the second material for manufacturing the first light-transmitting sheet 22 and the second light-transmitting sheet 23 may be manufactured using an optical-grade material, for example, using an optical-grade PC material. In the structural design, in order not to introduce extra focal power to the optical module, the first light-transmitting sheet 22 and the second light-transmitting sheet 23 are light-transmitting sheets with equal thickness and have no focal power.

Preferably, in order to prevent the first light-transmitting sheet 22 from directly contacting the ground when dropped, the connection beam 215 may further have a portion protruding forward and beyond the first light-transmitting sheet 22 (see fig. 1).

In addition, as shown in fig. 3, the bottom plate 210 of the bracket 21 may be further provided with a recess 216 near the second face 21B, the recess 216 having a shape conforming to the shape of the bridge of the nose for forming a nose pad in the middle of the bottom plate 210. By designing the shapes of the holder 21 and the second translucent sheet 23, a mask can be designed to fit the face of a human body.

Fig. 4 illustrates a second embodiment of the present invention, in which the structure of the mask 20 is illustrated. As shown in fig. 4, the cover 20 includes a support 21, a first light-transmitting sheet 22, and a second light-transmitting sheet 23. The frame 21 is made of a first material and has a first face remote from the face of a person and a second face adjacent to the face of a person; the first and second

light transmissive sheets

22 and 23 are made of a second material, the first material being different from the second material, preferably the first material has a higher strength and/or toughness than the second material; the first light-transmitting sheet 22 is arranged on the first surface of the bracket 21; the second light-transmitting sheet 23 is arranged on the second surface of the bracket 21; the first light transmission sheet 22, the second light transmission sheet 23 and the bracket 21 constitute a mask with an open upper side.

In this embodiment, the structural composition and manufacturing materials of the bracket 21, the first light-transmitting sheet 22 and the second light-transmitting sheet 23 are substantially the same as those of the first embodiment, except that the mask 20 covers a different range (the mask covers only a portion of the front side of the eyes), so that the shape of the bracket 21, the first light-transmitting sheet 22 and the second light-transmitting sheet 23 is different from that of the first embodiment.

Specifically, in this embodiment, the bracket 21 includes a bottom plate 210,

side plates

211, 212, a first connection beam 215, and a second connection beam 217. The bottom plate 210, the side plates 211 and the side plates 212 are integrally formed to form a U-shaped structure. Both ends of the first connection beam 215 are connected to the top ends of the

side plates

211 and 212, respectively, and the first connection beam 215 has a shape close to the outer contour of the base plate 210. Both ends of the second connection beam 216 are connected to the top ends of the

side plates

211 and 212, respectively, and the second connection beam 216 has a shape close to the inner contour of the bottom plate 210. The bottom plate 210, the

side plates

211 and 212, the first connection beam 215 and the second connection beam 216 constitute a frame, and a passage for external light to enter human eyes is formed between the bottom plate 210, the two

side plates

211 and 212 and the two

connection beams

215 and 216.

The outer profile of the bottom plate 210, the outer profile of the side plate 211, the outer profile of the side plate 212 and the first connecting beam 215 together define a first face of the bracket 21; the inner contour of the bottom plate 210, the inner contour of the side plate 211, the inner contour of the side plate 212 and the second connecting beam 216 together bound the second face of the bracket 21.

The difference from the first embodiment is: the bottom plate 210 has a uniform width in the viewing axis direction, and the

side plates

211 and 212 have widths gradually increasing from bottom to top in the viewing axis direction, so that the mask is formed in a shape with a large top and a small bottom.

In this embodiment, the frame 21 is limited to the portion of the eye socket covering the front of the face, so that the first and second faces of the frame 21 are both close to a plane, the first and second

light transmissive sheets

22 and 23 are disposed at different angles to the visual axis, and the first and second

light transmissive sheets

22 and 23 are also shaped close to a plane. The first and second light-transmitting

sheets

22 and 23 introduce no optical power.

In this embodiment, the first connection beam 215 connects the top ends of the two

side plates

211 and 212, respectively, and the first connection beam 215 is a straight cross beam. The first connecting beam 215, apart from the outwardly protruding portion 218, also comprises a wider arched web 219, which arched web 219 connects the two

side plates

211 and 212, respectively. When the first coupling beam 215 is coupled to the first light-transmitting sheet 22, the upper portion of the first light-transmitting sheet 22 is in contact with the arc-shaped coupling plate 219, thereby enhancing the structural strength of the entire mask.

The second connecting beam 217 connects the top ends of the two

side plates

211 and 212, respectively, and the second connecting beam 217 is also a straight beam. The second connection beam 217 has a wide width in the vertical direction. When the second connection beam 217 and the second light-transmitting sheet 23 are connected, the upper portion of the second light-transmitting sheet 23 and the second connection beam 217 are in contact, thereby enhancing the structural strength of the entire face mask 20.

The present invention provides a near-eye display device comprising the above-described face mask 20. As shown in fig. 1, the near-eye display device includes a case 10 and a face mask 20, and a lower end of the case 10 is connected to an upper end of the face mask 20. Specifically, the fixing to the housing 10 may be achieved by providing connection holes or the like in the upper ends of the

side plates

211, 212 and the connection beam 215, the positions of the connection holes being specifically designed according to the width of the connection beam 215 in the vertical direction and the width of the

side plates

211, 212 in the direction parallel to the visual axis. When assembling, the bracket 21 and the two light-transmitting

sheets

22 and 23 can be assembled together to form the face mask 20, and then the face mask 20 and the housing 10 can be assembled together; it is also possible to connect the bracket 21 to the housing 20 first and then to dispose the light transmissive sheet 22 and the light transmissive sheet 23 on the first and second surfaces of the bracket 21, respectively.

The optical module is fixedly arranged in the shell 10, part of elements of the optical module extend into the face mask 20, and the elements of the optical module extending into the face mask 20 can see through ambient light, so that the augmented reality application can be realized.

In conclusion, the mask and the near-eye display device provided by the invention have the advantages that the structural strength of the mask is enhanced by improving the structure of the mask, so that the structural strength of the whole near-eye display device is enhanced, and the use requirement of falling from a high altitude of at least 2 meters without damage can be met.

The mask and near-eye display device provided by the invention are explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereof can be made without departing from the spirit of the invention, which infringes the patent right of the invention and bears the corresponding legal responsibility.

Claims

1. A mask for a near-eye display device, comprising:

a bracket made of a first material and having a first face remote from a human face and a second face proximate to the human face;

a first light-transmitting sheet made of a second material and disposed on a first surface of the holder; the first material is different from the second material; and

a second light-transmitting sheet made of a second material and disposed on a second surface of the holder; the first light transmission piece, the second light transmission piece and the support form a mask with an upper opening.

2. The mask according to claim 1, wherein said support comprises:

two side plates respectively extending upwards from two sides of the bottom plate, wherein the inner side contour of the bottom plate and the side plates limit the second surface of the bracket; and

the first connecting beam is used for connecting the top ends of the two side plates; the bottom plate outside profile, the side plate outside profile, and the first connecting beam together define the first face of the bracket.

3. The mask of claim 2, wherein:

the inner contour of the bottom plate at least covers the orbit area of the front face of the human face.

4. The mask of claim 2, wherein:

the first connection beam has a portion exceeding the first light-transmitting sheet in the visual axis direction.

5. The mask of claim 2, wherein:

the bracket also comprises a second connecting beam which is used for connecting the top ends of the two side plates; the bottom panel inner profile, the side panel inner profile and the second connecting beam together bound the second face of the bracket.

6. The mask of claim 2, wherein:

a groove close to the second face is formed in the bottom plate and used for forming a nose pad.

7. The mask of claim 1, wherein:

the strength of the first material is higher than the strength of the second material, or the toughness of the first material is higher than the toughness of the second material.

8. The mask of claim 1, wherein:

the first material is a metal material, or the first material is plastic with higher strength and toughness than the second material.

9. The mask of claim 1, wherein:

the second material is an optical material, and the first and second light-transmitting sheets have no optical power.

10. A near-eye display device, comprising:

the mask of any one of claims 1 to 9;