CN204389720U - Lens and lens barrel comprising same - Google Patents

Abstract

The utility model discloses a lens and camera lens including this lens. The lens is suitable for a lens of a head-mounted display, and two mirror surfaces of the lens are convex aspheric mirror surfaces respectively; wherein the absolute value of the radius of curvature of one of the aspheric mirror surfaces is smaller than the absolute value of the radius of curvature of the other aspheric mirror surface; the lens is composed of a single lens. By using the utility model, the price of the lens is reduced, the volume of the lens is compressed, and the portability of the lens is improved; further, on the basis of the functional requirement of satisfying head mounted display, provide big exit pupil diameter, under the condition of no interpupillary distance, satisfy the people eye and watch the demand, the user uses head mounted display more easily, and the watching effect is better.

Description

A lens and a lens comprising the lens

technical field

The utility model relates to the field of optical lenses, in particular to a lens with two aspherical mirror surfaces, a lens including the lens and a head-mounted display.

Background technique

Head Mount Display (Head Mount Display) is a kind of head-mounted virtual display, also known as glasses-type display and portable theater. It is a popular name, because the glasses-type display looks like glasses, and can display the video image of the audio and video player for the large screen, so it is called video glasses (video glasses). Video glasses were initially demanded and applied to military affairs. The current video glasses are like the stage and status of the big brother and the big mobile phone. In the future, under the circumstance of the great development of 3C integration, it will achieve very rapid development.

At present, there are many types of head-mounted displays, but most of them are composed of a lens and a display. The image of the display emits light, which is collected in the eyes of the wearer through the lens. The wearer receives the light and forms an image. to the intersection of the extension lines, that is, at the rear of the monitor. In order to realize the above process, the lens needs to have at least the functions of controlling the main optical angle and controlling the field of view angle, and most of the current lenses are spherical lenses, and a single spherical lens cannot realize the above functions at the same time. For this reason, at least two existing The lens composed of a single lens makes the price of the lens and the head-mounted display high, which also leads to the inability to further compress the volume and poor portability.

At the same time, the head-mounted stereoscopic viewing devices that appear on the existing market are basically devices that combine mobile phones and head-mounted optical devices; Moreover, in 3D split-screen display, the maximum display effect that can be achieved technically is only half of the resolution of the mobile phone. For example, the mobile phone screen is 1080P, and the maximum split-screen 3D display effect achieved is only 540P, that is, The user's 3D high-definition video experience will be greatly reduced. At the same time, due to the limitation of the size of the mobile phone screen itself, when the mobile phone displays a 16:9 dual screen in 3D split screen, the utilization rate of the mobile phone screen is inevitably relatively low, and the video images displayed on the dual screen in the mobile phone are also relatively small, which will directly As a result, the virtual screen is relatively small and the sense of immersion is low during the 3D viewing process.

Utility model content

The utility model provides a lens and a lens including the lens and a head-mounted display, which are designed to solve the problems of insufficient field of view angle and poor portability through the single-chip lens design; at the same time, through independent dual-screen display, users can experience HD 3D visual effects.

In order to achieve the purpose of the above utility model, the utility model provides a lens, the lens is suitable for the lens of the head-mounted display, and the two mirror surfaces of the lens are respectively convex aspheric mirror surfaces;

Wherein, the absolute value of the radius of curvature of one aspheric mirror is smaller than the absolute value of the radius of curvature of the other aspheric mirror;

The shapes of the two aspheric mirror surfaces respectively conform to the following formulas,

$z=r^2/R(1+\sqrt{1-(K+1)r^2/R^2})+{\mathrm{Ar}}^4+{\mathrm{Br}}^6+{\mathrm{Cr}}^8+{\mathrm{Dr.}}^{10}+{\mathrm{Er}}^{12}+{\mathrm{Fr}}^{14}+{\mathrm{Gr}}^{16}+{\mathrm{HR}}^{18}+{\mathrm{Jr.}}^{20}$ in:

Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference;

R, is the radius of curvature;

r, is the lens height;

K, is the cone factor;

A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively.

The utility model also provides a lens, the lens is suitable for a head-mounted display, the lens is composed of a single lens, and the two mirror surfaces of the lens are respectively convex aspheric mirror surfaces;

Wherein, the absolute value of the radius of curvature of one described aspheric mirror is smaller than the absolute value of the radius of curvature of the other described aspheric mirror;

The shapes of the two aspheric mirror surfaces respectively conform to the following formulas,

$z=r^2/R(1+\sqrt{1-(K+1)r^2/R^2})+{\mathrm{Ar}}^4+{\mathrm{Br}}^6+{\mathrm{Cr}}^8+{\mathrm{Dr.}}^{10}+{\mathrm{Er}}^{12}+{\mathrm{Fr}}^{14}+{\mathrm{Gr}}^{16}+{\mathrm{HR}}^{18}+{\mathrm{Jr.}}^{20}$ in:

Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference;

R, is the radius of curvature;

r, is the lens height;

K, is the cone factor;

A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively.

The utility model further provides a head-mounted display, the head-mounted display includes a lens and a display device, the lens and the display device are located on the same optical axis,

The display device further includes two independent display modules;

The lens is composed of a single lens, and the two mirror surfaces of the lens are respectively convex aspheric mirror surfaces.

Preferably, in the above-mentioned head-mounted display,

The two independent display modules are arranged left and right, wherein,

The left display module is used to display the image for the left eye;

The right display module is used for displaying images for the right eye.

Preferably, in the above-mentioned head-mounted display,

The size of the display module is preset;

The display screen of the display module includes, but is not limited to, a liquid crystal display LCD, a light-emitting diode display LED, and an organic light-emitting diode display OLED.

Preferably, in the above-mentioned head-mounted display,

The display module further includes a display control unit;

The display control unit is used to control the screen display of the display module.

Preferably, in the above-mentioned head-mounted display,

Among the two aspherical mirror surfaces of the lens, the absolute value of the radius of curvature of one of the aspheric mirror surfaces is smaller than the absolute value of the radius of curvature of the other aspherical mirror surface;

The shapes of the two aspheric mirror surfaces respectively conform to the following formulas,

$\mathrm{<span\; class="notranslate">\; z</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Ar</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Br</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Cr</span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Dr.</span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Er</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Fr</span>}}^{\mathrm{<span\; class="notranslate">\; 14</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Gr</span>}}^{\mathrm{<span\; class="notranslate">\; 16</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; HR</span>}}^{\mathrm{<span\; class="notranslate">\; 18</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Jr.</span>}}^{\mathrm{<span\; class="notranslate">\; 20</span>}}$

in,

Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference;

R, is the radius of curvature;

r, is the lens height;

K, is the cone factor;

A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively.

Preferably, in the above-mentioned head-mounted display,

The effective range of the optical axis offset of the human eye relative to the lens is 0 mm to 4 mm.

Preferably, in the above-mentioned head-mounted display,

The left-eye optical system composed of the lens and the left display module has a viewing angle from 40 to 110 degrees and forms a virtual image of the left-eye image;

The right-eye optical system composed of the lens and the right display module has a viewing angle from 40 to 110 degrees and forms a virtual image of the right-eye image;

Preferably, in the above-mentioned head-mounted display,

The left-eye optical system forms a 1124-inch magnified virtual image of the left-eye image at a distance of 10 meters or more from the left eye; and,

The right-eye optical system forms a 1124-inch magnified virtual image of the right-eye image at a distance of 10 meters or more from the right eye.

Compared with the prior art, the utility model has the beneficial effects as follows:

By using the lens provided by the utility model and the lens including the lens and the head-mounted display, it can be realized that the functional requirements of the lens of the head-mounted display with a large field of view can be met by a single lens; it can be realized that when the functional requirements of the lens are met On the basis of reducing the price of the lens, reducing the size of the lens, and improving the portability of the lens; further, it can be realized that on the basis of meeting the functional requirements of the head-mounted display, a large exit pupil diameter is provided, and the pupil distance is not adjusted. , to meet the viewing needs of the human eye, it is easier for users to use the head-mounted display, and the viewing effect is better.

Description of drawings

Fig. 1 is the structural principle composition of a kind of lens of the utility model embodiment;

2 is an optical schematic diagram of a head-mounted display according to an embodiment of the present invention;

3 is a schematic structural view of a head-mounted display according to an embodiment of the present invention;

Figure 4 is an exploded view of Figure 3;

Fig. 5 is the field curvature diagram of the human eye aligning with the optical center lens according to the embodiment of the present invention;

Fig. 6 is a distortion diagram of the human eye aligned with the optical center lens according to the embodiment of the present invention;

Fig. 7 is a spot diagram of the human eye deviating from the optical center by 4 mm according to the embodiment of the present invention;

Fig. 8 is the optical structure diagram of the human eye deviating from the optical center by 4 mm according to the embodiment of the present invention;

Fig. 9 is an optical structure diagram of the human eye aligned with the optical center according to the embodiment of the present invention;

Fig. 10 is a point diagram of the human eye aligning with the optical center lens according to the embodiment of the present invention;

Fig. 11 is a schematic diagram of virtual imaging according to the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.

lens embodiment

The embodiment of the utility model discloses a lens, the lens is suitable for the lens of the head-mounted display, and the two mirror surfaces of the lens are respectively convex aspheric mirror surfaces, for the convenience of description, as shown in Figure 1, The two aspheric mirror surfaces are respectively a first aspheric mirror surface 11 and a second aspheric mirror surface 12 .

When the lens 11 is used to form a lens of a head-mounted display: the first aspheric mirror surface 11 faces the human eye and is used to adjust the viewing angle, that is, the first aspheric mirror surface 11 replaces the existing lens , a separate lens that is mainly used to control the angle of view; the second aspheric mirror 12 faces the display, that is, the second aspheric mirror 12 replaces the existing lens, and is mainly used to control the main optical angle. lens. Based on this, the lens of the present invention is used alone as a lens, that is, the lens is composed of a single lens, which can meet the control requirements of the lens for the field of view angle and the main optical angle.

In the embodiment of the present invention, in order to realize that the single-chip lens meets the functional requirements of the lens of the head-mounted display for the control of the field of view angle and the main optical angle, the absolute value of the radius of curvature of one of the aspheric mirror surfaces of the lens , which is smaller than the absolute value of the radius of curvature of the other aspheric mirror surface. Referring to Fig. 1, the radius of curvature of the first aspheric mirror surface is R1, R1>0, and the unit is mm; the radius of curvature of the second aspheric mirror surface is R2, R2<0, then: -R2<R1, R2 <0 means that the bending direction of the second surface type is opposite to the light direction, and the value range of R2 is -25<R2<-20; in this embodiment, R2 is -21.296.

The shapes of the two aspheric mirror surfaces in the embodiment of the utility model conform to the following formulas respectively,

$z=r^2/R(1+\sqrt{1-(K+1)r^2/R^2})+{\mathrm{Ar}}^4+{\mathrm{Br}}^6+{\mathrm{Cr}}^8+{\mathrm{Dr.}}^{10}+{\mathrm{Er}}^{12}+{\mathrm{Fr}}^{14}+{\mathrm{Gr}}^{16}+{\mathrm{HR}}^{18}+{\mathrm{Jr.}}^{20}$ in:

Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference;

R, is the radius of curvature;

r, is the lens height;

K, is the cone coefficient;

A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively.

Different head-mounted displays have different requirements for the functional parameters of the lens. When designing and processing, the lens can be accurately determined according to the aspheric coefficient provided by the designer, as well as parameters such as center thickness, edge thickness, and outer diameter. The shape of the two aspheric mirror surfaces.

lens embodiment

The example of the utility model provides a lens, which is suitable for a head-mounted display, and the lens in this embodiment is composed of a single lens.

Specifically, in this embodiment, the lens is composed of a single lens, and the lens is the same as the lens in the foregoing lens embodiment, and will not be described again.

Referring to FIG. 1 , the first aspheric mirror surface 11 faces the human eye and is used to control the viewing angle; the second aspheric mirror surface 12 faces the display and is used to control the main optical angle. Based on this, the lens is composed of a single lens, which can realize the functional requirements of controlling the angle of view and the main optical angle, and compared with the existing lens composed of at least two lenses, the lens of the present utility model Lower cost and smaller size.

Head Mounted Display Embodiment

Referring to Fig. 3-Fig. 4, this embodiment discloses a head-mounted display.

Fig. 2 is the optical schematic diagram of the head-mounted display, and Fig. 4 is the schematic structure diagram of the head-mounted display, specifically, the display includes a lens 2 and a display device 4, and the lens and the display device are located at The same optical axis; the display device further includes two independent display modules; the lens is composed of a single lens, and the two mirror surfaces of the lens are respectively convex aspheric mirror surfaces.

When the two independent display modules of the embodiment of a head-mounted display in this embodiment are arranged left and right, as shown in Figure 4, the left display module 4L and the right display module 4R; the left display module 4L is used to display the Image; the right display module 4R is used to display the image for the right eye. The size of the display module is preset, and its size range is preferably 0.4 inches to 7 inches. The display screen of the display module includes, but is not limited to, a liquid crystal display LCD, a light-emitting diode display LED, and an organic light-emitting diode display OLED. The independent display module can be customized according to the display requirements of the actual product, film and television or games, and can be set to 16:9, 4:3 and other different ratios to improve the utilization rate of the screen; at the same time, the dual-screen independent display can be extremely It meets the requirements of 3D dual-image display well, improves the resolution of 3D display, and enables users to experience high-definition 3D visual effects; effectively avoids single-screen dual-image display and reduces the display pixels of movies or games, resulting in the virtual reality perceived by human eyes. The screen display effect is not clear, and the experience is poor. The display module further includes a display control unit; the display control unit is used to control the screen display of the display module.

Fig. 2 is an optical principle diagram of a head-mounted display according to an embodiment of the utility model. In order to better understand the embodiment of the present invention, firstly, the principle of stereoscopic imaging is explained:

The reason why human vision can distinguish between distance and near depends on the gap between the two eyes. A person's two eyes are about 5 cm apart, and the angles of the two eyes will not be the same when looking at anything except the front. Although the gap is very small, it is transmitted to the brain through the retina, and the brain uses this tiny gap to generate the depth of distance and thus create a three-dimensional effect. Although one eye can see objects, it is not easy to distinguish the distance of objects. According to this principle, if the same image is used to create two images using the difference in the angle of view of the two eyes, and then let the two eyes see one side of the image, and each eyeball sees the image on its own side, the brain can generate the depth of field through the retina. Three-dimensional sense.

The images of the independent display modules 4L and 4R in Fig. 4 enter the left eye and right eye of the person through the lens; that is, what the human eye sees after the lens is an enlarged virtual image imaged at a certain distance in front of the human eye, which can be enjoyed in a theater Watch videos in HD 3D on a large screen.

That is, the head-mounted display displays a left-eye image and a right-eye image on separate screens so that the user's eyes can view a stereoscopic image by synthesizing the two screens. Images displayed on the left-eye and right-eye display modules 4L and 4R become enlarged virtual images via lenses. When the virtual images are focused on the retinas of the left and right eyes, they enter the brain as individual items of information, where they are combined into a stereoscopic image.

Specifically, the lens is composed of a single lens, the first aspheric mirror surface 11 faces the human eye, and the second aspheric mirror surface 12 faces the display device. The light of the display device first passes through the second aspheric mirror 12, adjusts the main optical angle through the second aspheric mirror 12, then enters the lens and passes through the first aspheric mirror 11 The line of sight of the human eye first passes through the first aspheric mirror surface 11, the first aspheric mirror surface 11 adjusts the viewing angle, and then the imaging after passing through the lens is located on the display the rear of the device.

The lens is the same as the lens in the foregoing lens embodiments, that is, the lens conforms to:

1. The two mirror surfaces of the lens are respectively convex aspheric mirror surfaces, that is, the first aspheric mirror surface 11 and the second aspherical mirror surface 12;

2. The absolute value of the radius of curvature R1 of the first spherical mirror surface 11 is greater than the absolute value of the radius of curvature R2 of the second aspherical mirror surface 12;

3. The two aspheric mirror surfaces respectively conform to the following formulas,

$\mathrm{<span\; class="notranslate">\; z</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Ar</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Br</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Cr</span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Dr.</span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Er</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Fr</span>}}^{\mathrm{<span\; class="notranslate">\; 14</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Gr</span>}}^{\mathrm{<span\; class="notranslate">\; 16</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; HR</span>}}^{\mathrm{<span\; class="notranslate">\; 18</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Jr.</span>}}^{\mathrm{<span\; class="notranslate">\; 20</span>}}$

in:

Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference;

R, is the radius of curvature;

r, is the lens height;

K, is the cone coefficient;

A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively.

The following table 1 shows the specific parameter requirements of a certain type of head-mounted display for the lens, that is, the lens of the lens, for the radius of curvature (R), height square value (r), conic coefficient (K) and various The second aspheric coefficient (A, B, C, D, E, F, G, H, J) parameter values respectively adopt the following data, and on this basis, combine two described aspheric mirror surface reverse convex and -The shape requirement of R2<R1 can accurately determine the shape of the two aspheric mirror surfaces of the lens;

Table I

In the embodiment, the two aspheric coefficients are shown in Table 1: r=0-19.7mm

the S1 S2 R 85.258 -21.296 K 3.36493 -1.03252 A -4.469e-6 5.266e-6 B 7.7577e-9 -4.107e-8 C -7.137e-12 9.094e-11 D. 1.706e-15 -6.242e-14 E. 0 0 f 0 0

[0109] h 0 0 G 0 0

For this type of head-mounted display, after testing, its field curvature diagram is shown in Figure 5, its distortion diagram is shown in Figure 6, and its spot diagram is shown in Figure 7. In the figure, the wavelengths of 700nm, 546.1nm, and 435.8nm were analyzed respectively. According to the analysis results shown in the figure, the field curvature of this type of head-mounted display is within 10mm, the distortion is within 40%, and the spot radius RMS is less than 0.55mm. Therefore, the head-mounted display of this type adopts a lens composed of a single lens, which fully meets the parameters and indicators of the head-mounted display. And on this basis, the cost of the head-mounted display is lower, the volume is further compressed, and it has better portability.

Referring to Figures 8-11, the head-mounted display of the present invention adopts a lens composed of a single lens, which fully meets the requirements of the head-mounted display for having a certain optical axis offset. in:

FIG. 8 shows the optical principle diagram when the optical axis is shifted by 4mm, and correspondingly, FIG. 7 shows the spot diagram obtained from the test and analysis when the optical axis is shifted by 4mm.

Fig. 9 shows the optical principle diagram when the optical axis is shifted by 0 mm, and Fig. 10 shows the spot diagram obtained from the test and analysis when the optical axis is shifted by 0 mm.

From the analysis results shown in the figure, it can be seen that when the deviation from the optical axis is 0mm and 4mm, the RMS radius point of this type of head-mounted display is less than 0.55mm, which meets the quality requirements of the head-mounted display. In addition, the interpupillary distance of the human eye is generally about 4 mm, so the effective range of the optical axis offset is 0 mm to 4 mm, which is sufficient to meet the user's usage habits.

At the same time, in the embodiment of the utility model, the viewing angle range is -55 degrees to 55 degrees. Specifically, the corresponding viewing angle parameters are set through the optical design software, and then the design results are optimized. The spot size of each viewing angle is shown in the spot diagram 7 and FIG. 10 , field curvature and distortion are shown in FIG. 5 and FIG. 6 , in the embodiment, the observation range of the human eye is a circular area with a diameter of 13 mm. See Figure 8, the radius is 6.5 mm; in this example, the pupil size of the simulated human eye is 5 mm in diameter, see Figure 9, when the human eye is aligned with the center of the lens, the optical structure diagram of the simulated human eye receiving light is shown in Figure 9, When the human eye deviates from the optical axis by 4mm, it meets the design requirements of the 13mm observation range. The optical structure diagram of the simulated human eye receiving light is shown in Figure 8. When the human eye deviates from the optical axis by 4mm, the spot diagram of the lens is shown in Figure 7; Figure 7 and Figure 10 show that in the 13mm observation area, when the observation angle ranges from -55 degrees to 55 degrees, the scenery seen will be very clear.

Referring to Figure 11, in the embodiment of the utility model, when the viewing angle α is 55 degrees, it can achieve a screen equivalent to 1124 inches viewed from a distance of 10 meters; the specific calculation process is as follows:

Virtual image size = 2x10x1000xtgα/25.4 = 2x10x1000xtg55°/25.4 = 1124 inches

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (2)

1. a kind of lens, described lens is applicable to the lens of head-mounted display, it is characterized in that: The two mirror surfaces of the lens are respectively convex aspherical mirror surfaces; Wherein, the absolute value of the radius of curvature of one aspheric mirror is smaller than the absolute value of the radius of curvature of the other aspheric mirror; The shapes of the two aspheric mirror surfaces respectively conform to the following formulas, in: Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference; R, is the radius of curvature; r, is the lens height; K, is the cone factor; A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively. 2. A lens, which is suitable for a head-mounted display, is characterized in that the lens is made of a single lens, and the two mirror surfaces of the lens are respectively convex aspheric mirror surfaces; Wherein, the absolute value of the radius of curvature of one of the aspheric mirror surfaces is smaller than the absolute value of the radius of curvature of the other aspherical mirror surface; The shapes of the two aspheric mirror surfaces respectively conform to the following formulas, in: Z, is the reference distance from the optical axis at the position r along the optical axis direction with the fixed point on the surface as a reference; R, is the radius of curvature; r, is the lens height; K, is the cone factor; A, B, C, D, E, F, G, H, J are the aspheric coefficients of each order respectively.