CN109960041A - Lightweight high-resolution AR glasses - Google Patents

Abstract

The present invention relates to a lightweight high-resolution AR glasses. It includes a frame and two sets of AR optical elements arranged on the frame. Each group of AR optical elements includes an objective lens, a micro display device, an eyepiece, and an inverting prism that are arranged on the frame along the light incident direction. The objective lens and eyepiece are of the same shape. For a positive lens with the same focal length, the incident surface and the exit surface of the inverted prism are perpendicular to the optical axis, the microdisplay device is located within the optical length of one focal length of the eyepiece, and the optical length from the objective lens to the focal plane of the objective lens is the same as the focal length from the eyepiece to the objective lens. The optical lengths of the planes are equal. The objective lens and the eyepiece of the present invention form a symmetrical optical system, so that the human eye can see the superposition of the virtual image and the real scene through the eyepiece, the micro-display device and the optical system, so as to realize the interaction between the user and the surrounding environment. The cost is low, and the divergence effect in the optical propagation process can be overcome, and high-resolution images can be displayed.

Description

Lightweight high-resolution AR glasses

technical field

The present invention relates to the field of augmented and mixed reality, in particular to a lightweight high-resolution AR glasses.

Background technique

Augmented Reality (AR) is a new technology developed on the basis of virtual reality, also known as Mixed Reality (MR). It is a technology that uses virtual objects to enhance the reality of real scenes. Augmented reality is based on the real physical environment collected by acquisition devices such as cameras. By labeling the virtual generated information such as text, two-dimensional images, and three-dimensional image models on the objects in the real physical environment displayed on the display screen, users can realize the real physical environment. Annotation, description, or augmentation or emphasis of certain effects of the actual physical environment in which one is present. Augmented reality technology gives users an experience of integrating virtual objects with the real environment. It can effectively help users recognize the surrounding environment, add information about the surrounding environment, and realize the interaction between the user and the surrounding environment.

The existing AR devices mainly include video perspective type and optical perspective type. The video perspective type uses a camera to capture the external environment, and then fuses it with the virtual environment image and displays it to the user. The biggest problem of this form is that there are delays. When the optical perspective type uses a combined mirror to synthesize the information of the virtual environment and the real environment and display it to the user, the user can directly view the external environment through the combined mirror, which overcomes the problem of time delay in the video perspective type. The optical perspective type, the current technology is Projecting the virtual environment into the user's field of vision through combination lenses, prisms or waveguide sheets for imaging cannot overcome the divergence effect in the optical propagation process, is not suitable for displaying high-resolution images, and has a complex structure and high cost.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above shortcomings and provide a kind of lightweight high-resolution AR glasses, the objective lens and the eyepiece of the glasses form a symmetrical optical system, so that the human eye can see the virtual through the eyepiece, the micro display device and the optical system. The superposition of the image and the real scene realizes the interaction between the user and the surrounding environment, which not only has a simple structure and low manufacturing cost, but also can overcome the divergence effect in the optical propagation process and display high-resolution images.

The present invention is realized as follows: a kind of lightweight high-resolution AR glasses, which is characterized by comprising a frame and two sets of AR optical elements arranged on the frame, and each group of AR optical elements includes a pair of AR optical elements arranged on the mirror along the incident direction of light. The objective lens, the microdisplay device, the eyepiece, and the inverting prism on the frame, the objective lens and the eyepiece adopt a positive lens of the same shape and the same focal length, and the incident surface and the outgoing surface of the inverting prism are both perpendicular to the optical axis, and the microscopic The display device is located within the optical length of one focal length of the eyepiece, and the optical length from the objective lens to the focal plane of the objective lens is equal to the optical length from the eyepiece to the focal plane of the objective lens.

Preferably, the objective lens and the eyepiece are plano-convex lenses or biconvex lenses or Fresnel lenses.

Preferably, the inverted image prism is a Biehan inverted image prism, and the inverted image prism is composed of a half pentagonal prism and a roof prism.

Preferably, when the objective lens and the eyepiece are plano-convex lenses or biconvex lenses, the eyepiece is located between the microdisplay device and the inverse prism.

Preferably, when the objective lens and the eyepiece are Fresnel lenses, the eyepiece is fixed between the two abutting surfaces of the half-pentagon prism and the roof prism.

Preferably, the focal length of the objective lens and the eyepiece ranges from 6 mm to 50 mm.

Preferably, the refractive index of the objective lens and the eyepiece is 1.5-1.8.

Preferably, the refractive index of the inverse prism is 1.5˜2.0.

Preferably, the spectacle frame includes a spectacle frame body, two temples hinged on the spectacle frame body, and two lens barrels fixedly mounted on the spectacle frame body, and each group of AR optical elements is installed in the corresponding lens barrel .

Preferably, the mirror frame further comprises a front mirror cover fixedly mounted on the front end surface of the mirror frame body and limiting the front end of the mirror barrel, and a front mirror cover fixed on the rear end surface of the mirror frame body and acting on the rear end of the mirror barrel Rear mirror caps for limiting action.

Compared with the prior art, the present invention has the following advantages:

(1) A kind of portable high-resolution AR glasses provided by the present invention, the objective lens and the eyepiece of the glasses form a symmetrical optical system, so that the human eye can see the virtual image and reality through the eyepiece, the micro display device and the optical system The superposition of the scene realizes the interaction between the user and the surrounding environment, which not only has a simple structure and low manufacturing cost, but also overcomes the divergence effect in the optical propagation process and displays high-resolution images;

(2) A kind of portable high-resolution AR glasses provided by the present invention is provided with an inverted prism, which can reverse the inverted reality scene generated by the objective lens and the eyepiece, so that the human eye can see the normal reality scene;

(3) A kind of portable high-resolution AR glasses provided by the present invention, the objective lens and the eyepiece adopt the Fresnel lens, which reduces the thickness of the lens and makes the AR glasses lighter, and the eyepiece is fixed on the half-pentagon prism and the roof prism. Between the two bonding surfaces, the half pentagonal prism shares the optical path from the eyepiece to the microdisplay device, the distance between the inverted prism and the microdisplay device can be further reduced, and the entire structure can be designed to be smaller;

(4) The lightweight high-resolution AR glasses provided by the present invention can be made smaller in size, lighter in weight, and lower in cost. Real scenes do not need to be photographed by cameras and superimposed by processors, and there is no image delay card. Dayton phenomenon.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings in conjunction with the embodiments:

Fig. 1 is the exploded structure schematic diagram of embodiment 1 of the present invention;

Fig. 2 is the light path diagram of one group of AR optical elements in embodiment 1;

Fig. 3 is the structural representation of Bihan prism of the present invention;

Fig. 4 is the three-dimensional structure schematic diagram of Biehan prism of the present invention;

Fig. 5 is the exploded structure schematic diagram of embodiment 2 of the present invention;

FIG. 6 is an optical path diagram of one set of AR optical elements in Example 2. FIG.

Explanation of symbols in the figure: 1, spectacle frame, 11, spectacle frame body, 12, temples, 13, lens barrel, 14, front mirror cover, 15, rear mirror cover, 2, objective lens, 3, micro display device, 4, Eyepiece, 5, Inverted prism, 51, Half pentagonal prism, 52, Roof prism, 6, Human eye.

Detailed ways

The content of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments of the description:

Example 1:

As shown in Figures 1-4, a lightweight high-resolution AR glasses provided by the present invention is characterized in that: it includes a frame 1 and two sets of AR optical elements arranged on the frame 1, and each group of AR optical elements includes The objective lens 2, the microdisplay device 3, the eyepiece 4, and the inverted image prism 5 are arranged on the frame 1 along the incident direction of the light rays. The incident surface and the exit surface are both perpendicular to the optical axis, the microdisplay device 3 is located within the optical length of one focal length of the eyepiece 4, and the optical length from the objective lens 2 to the focal plane of the objective lens 2 is the same as the focal length from the eyepiece 4 to the objective lens 2. The optical lengths of the planes are equal. In this embodiment, the objective lens 2 and the eyepiece 4 use biconvex lenses, but of course plano-convex lenses can also be used.

The micro-display device 3 includes a microprocessor and a micro-display device, and the microprocessor is connected with the micro-display device to control the following four display states of the virtual image on the micro-display device:

a. The micro-display device is a transflective display that can both display the output image of the microprocessor and see the real scene ahead through the micro-display device, so that the human eye can see the superposition of the virtual image and the real image;

b. The micro-display device is a time-division display that can alternately switch between two states of displaying only the output image of the microprocessor and completely transparent without an image, so that the human eye can see the virtual image and the real scene respectively in a very short time gap , due to the delay of human eye perception, so that the human eye sees what seems to be the superposition of the virtual image and the real scene;

c. The micro-display device is a transparent display, the part of the micro-display device that displays the image output by the microprocessor is opaque, and the rest of the micro-display device is transparent, and the real scene can be seen through the transparent part, making people See the superposition of the virtual image and the real image;

d. The micro-display device is a transparent display. The part of the micro-display device that displays the image output by the microprocessor is translucent, and the rest of the micro-display device is transparent. The real scene can be seen, so that the human eye can see the superposition of the virtual image and the real image.

As shown in FIGS. 3-4 , the inverting prism 5 adopts a Biehan inverting prism, and the inverting prism 5 is composed of a half pentagonal prism 51 and a roof prism 52 . The angle a in the half pentagonal prism 51 is 45 degrees, the angle b is 112.5 degrees, and the angle c in the roof prism 52 is 45 degrees. The magnification of virtual digital information on the transparent display screen, such as distance, field of view, and the size of the entire glasses are different. At the same time, the choice of lens material will also affect the design, and the refractive index of the objective lens 2 and the eyepiece 4 is 1.5-1.8. The refractive index of the material of the inverted image prism has a great influence on the field angle of the glasses. The refractive index of the inverted image prism 5 is 1.5 to 2.0. The inverted image prism made of the material with the larger refractive index can realize the field angle of the glasses. bigger.

The following is a parameter calculation table for the lens focal length of 26mm and acrylic (PMMA) for material selection:

As shown in FIG. 1 , the spectacle frame 1 includes a spectacle frame body 11 , two temples 12 hinged on the spectacle frame body 11 , and two lens barrels 13 fixedly mounted on the spectacle frame body 11 . The components are all installed in the corresponding lens barrels 13 . The mirror frame 1 further includes a front mirror cover 14 fixedly installed on the front end surface of the mirror frame body 11 and limiting the front end of the mirror barrel 13 , and a front mirror cover 14 fixed on the rear end surface of the mirror frame body 11 and positioned on the mirror barrel 13 . The rear mirror cover 15 whose rear end acts as a limiter.

In this embodiment, the optical system of the AR glasses is composed of four main parts: an objective lens, a micro-display device, an eyepiece, and an inverting prism. The positive lens acts as an eyepiece to magnify the image on the display screen, and the micro-display device is located within the focal length f of the positive lens, so that the human eye can see the magnified virtual image on the micro-display device through the positive lens. If there are no other optical components before the micro-display device, then the real scene of the real environment through the micro-display device is generally beyond the focal length (2f) of twice the positive lens, then through this positive lens, the human eye can only see the zoomed out Inverted image. That is to say, the real scene is unreal or unclear. In this embodiment, the objective lens is a lens with the same focal length and the same focal length as the eyepiece. The focal points of the two lenses overlap to form a symmetrical optical system. Through this optical system, the human eye can see an inverted 1:1 reality scene. Therefore, , an inverted prism group must be added between the human eye and the eyepiece. The inverted prism group inverts the inverted real scene generated by the two lenses so that the human eye can see the normal real scene. However, after the virtual information on the transparent display screen is enlarged by the eyepiece, the virtual information will also be inverted once due to the addition of the inverted prism. Therefore, when designing a transparent display, let the lens display display inverted information. At the same time, since the optical path is reversible, it can also be used in reverse, that is, the end of the eyepiece plus the inverted prism faces the object (real scene), and the end of the objective lens faces the eye.

Example 2:

As shown in FIGS. 5-6 , the difference between Example 2 and Example 1 is that both the objective lens 2 and the eyepiece 4 use Fresnel lenses, and the eyepiece 4 is fixed on two sides of the half pentagonal prism 51 and the roof prism 52 . between the mating surfaces. In this embodiment, the objective lens 2 and the eyepiece 4 use a Fresnel lens, which reduces the thickness of the lens and makes the AR glasses lighter, and the eyepiece 2 is fixed on the two abutting surfaces of the half pentagonal prism 51 and the roof prism 52 In between, the half pentagonal prism 51 shares the optical path from the eyepiece 2 to the microdisplay device 3, the distance between the inverting prism 5 and the microdisplay device 3 can be further reduced, and the entire structure can be designed to be smaller.

The above-mentioned specific embodiments merely explain the technical solutions of the present invention in detail, and the present invention is not only limited to the above-mentioned embodiments, and any improvement or replacement based on the principles of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A portable high-resolution AR glasses, characterized in that it comprises a frame (1) and two groups of AR optical elements arranged on the frame (1), and each group of AR optical elements comprises an The objective lens (2), the micro-display device (3), the eyepiece (4), and the inverting prism (5) on the frame (1), the objective lens (2) and the eyepiece (4) adopt positive lenses of the same shape and focal length , the incident surface and the outgoing surface of the inverting prism (5) are both perpendicular to the optical axis, the microdisplay device (3) is located within the optical length of one focal length of the eyepiece (4), and the objective lens (2) to The optical length of the focal plane of the objective lens (2) is equal to the optical length of the eyepiece (4) to the focal plane of the objective lens (2). 2 . The portable high-resolution AR glasses according to claim 1 , wherein the objective lens ( 2 ) and the eyepiece ( 4 ) are plano-convex lenses or biconvex lenses or Fresnel lenses. 3 . 3. The portable high-resolution AR glasses according to claim 2, characterized in that: the inverted image prism (5) adopts a different inverted image prism, and the inverted image prism (5) consists of a half-pentagonal prism ( 51) and a roof prism (52). 4. The portable high-resolution AR glasses according to claim 3, characterized in that: when the objective lens (2) and the eyepiece (4) are plano-convex lenses or biconvex lenses, the eyepiece (4) is located in the microdisplay device (3) and the inverted prism (5). 5. The portable high-resolution AR glasses according to claim 3, characterized in that: when the objective lens (2) and the eyepiece (4) are Fresnel lenses, the eyepiece (4) is fixed on a half-pentagon between the two abutting surfaces of the prism (51) and the roof prism (52). 6 . The portable high-resolution AR glasses according to claim 1 , wherein the focal length of the objective lens ( 2 ) and the eyepiece ( 4 ) ranges from 6 mm to 50 mm. 7 . 7 . The portable high-resolution AR glasses according to claim 1 , wherein the refractive index of the objective lens ( 2 ) and the eyepiece ( 4 ) is 1.5˜1.8. 8 . 8 . The portable high-resolution AR glasses according to claim 1 , wherein the refractive index of the inverting prism ( 5 ) is 1.5˜2.0. 9 . 9. The lightweight high-resolution AR glasses according to claim 1, wherein the frame (1) comprises a frame body (11), two temples hinged on the frame body (11) (12) and two lens barrels (13) fixedly installed on the lens frame body (11), and each group of AR optical elements is installed in the corresponding lens barrel (13). 10. The portable high-resolution AR glasses according to claim 1, characterized in that: the glasses frame (1) further comprises a fixed installation on the front end surface of the frame body (11) and facing the lens barrel (13). A front mirror cover (14) whose front end acts as a limiter and a rear mirror cover (15) which is fixedly mounted on the rear end surface of the mirror frame body (11) and serves as a limiter for the rear end of the lens barrel (13).