CN207502825U - A compact VR lens system and VR display device - Google Patents

Abstract

The utility model provides a compact VR lens system and VR display device, including exit pupil and screen which are coaxially arranged, between the exit pupil and the screen, there are exit lens, lens group and incident lens in turn, the exit lens is located at one side near the exit pupil; the curvature radius of the surface of one side, close to the exit pupil, of the exit lens is smaller than 0, and the curvature radius of the surface of one side, close to the screen, of the incident lens is larger than 0; the lens system satisfies the following equation: 2ER tan (FOV/2) > DoD, field angle of the lens system being FOV, exit pupil distance being ER, diagonal length of the screen being DoD. The utility model discloses set up compact lens structure, can effectively reduce the holistic volume of VR display device, can ensure that ER and FOV's value is enough big when reducing the screen size to effectively ensure the definition of the image that forms and the sense of immersing when the user uses, VR lens system's colour difference is little, makes the image quality high that the user observed.

Description

A compact VR lens system and VR display device

technical field

The utility model relates to a VR display structure, and specifically discloses a compact VR lens system and a VR display device.

Background technique

VR (Virtual Reality, virtual reality) is a computer simulation system that can create and experience a virtual world. It uses a computer to generate a simulated environment. System simulation immerses the user in the environment.

The optical part of existing VR display devices mainly uses screens and lenses to simulate a virtual image for users, allowing users to immerse themselves in it. Most of the lenses used in VR display devices are single-piece aspherical lenses or Fresnel lenses. Due to the lack of degrees of freedom, the focal length of the system cannot be significantly reduced to obtain a large enough field of view, so it is only suitable for systems with large screens, such as 4-7 inch screens, but cannot be applied to small screens with high resolution On a large screen, such as a screen under 1 inch with a resolution of FHD or higher.

Most of the screens of mainstream VR display devices in the market have a DoD (Diagonal of Display, screen diagonal length) of more than 80 mm. With the diversification of people's needs, in order to reduce the weight and space occupied by VR display devices, some VR display devices are set to be miniaturized, but while reducing the screen size, ER (Eye Relief, exit pupil distance) and FOV (FieldAngle) Reduced, thereby reducing the clarity and immersion of the image brought by the VR display device to the user.

Utility model content

Based on this, it is necessary to address the existing technical problems and provide a compact VR lens system and VR display device, which can ensure that the values of ER and FOV are large enough while reducing the screen size, thereby ensuring the clarity of the image and the resulting immersion.

In order to solve the problems in the prior art, the utility model discloses a compact VR lens system, which includes an exit pupil and a screen arranged coaxially, and an exit lens, a lens group, and an entrance lens are sequentially arranged between the exit pupil and the screen, and the exit lens is located at The side close to the exit pupil;

The radius of curvature of the surface of the exit lens close to the exit pupil is less than 0, and the radius of curvature of the surface of the entrance lens close to the screen is greater than 0;

The lens system satisfies the following equation:

2ER*tan(FOV/2)>DoD

The field of view of the lens system is FOV, the exit pupil distance is ER, and the diagonal length of the screen is DoD.

Further, the outgoing lens, the lens group and the incoming lens are arranged coaxially.

Further, the exit lens is set coaxially with the exit pupil.

Further, the diameters of the outgoing lens, the incoming lens and the lens group are all less than or equal to 45 mm.

Further, both the outgoing lens and the incoming lens are concave lenses.

Further, the lens group includes at least one convex lens.

The utility model also discloses a compact VR display device, which includes a compact VR lens system described in any one of the above items.

Further, the exit lens, the lens group and the entrance lens cover are provided with a rectangular lens barrel.

The beneficial effects of the utility model are: the utility model discloses a compact VR lens system and a VR display device. The compact lens structure can effectively reduce the overall volume of the VR display device. The degree of freedom of the large overall lens system can ensure that the values of ER and FOV are large enough while reducing the screen size, thereby effectively ensuring the clarity of the formed image and the immersion of the user when using it. The chromatic aberration of the VR lens system is small, allowing users to The observed image quality is high, mainly by reducing the size of the screen to reduce the volume and weight of the VR display device.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of Embodiment 1 of the utility model.

Fig. 3 is a lateral color difference diagram of Embodiment 1 of the present utility model.

Fig. 4 is a schematic structural diagram of Embodiment 2 of the utility model.

Fig. 5 is a lateral color difference diagram of Embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of Embodiment 3 of the present utility model.

Fig. 7 is a lateral color difference diagram of Embodiment 3 of the present utility model.

Fig. 8 is a schematic structural diagram of Embodiment 4 of the present utility model.

Fig. 9 is a lateral color difference diagram of Embodiment 4 of the present utility model.

Reference signs are: exit pupil 11 , screen 12 , exit lens 21 , lens group 30 .

Detailed ways

In order to further understand the features, technical means, and specific objectives and functions of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Refer to Figures 1 to 9.

The utility model discloses a compact VR lens system, as shown in Figure 1, comprising an exit pupil 11 and a screen 12 arranged coaxially, an exit lens 21, a lens group 30 and an incident Lens 22, preferably, the refractive index and Abbe coefficient of the exit lens 21 and the entry lens 22 are the same, and the exit lens 21 is located on the side close to the exit pupil 11; the radius of curvature of the surface of the exit lens 21 near the exit pupil 11 is less than 0 , can effectively reduce the overall distortion of the lens system. The radius of curvature of the surface of the entrance lens 22 close to the screen 12 is greater than 0. The entrance lens 22 cooperates with the exit lens 21 to adjust the spherical aberration of the entire lens system to ensure that the image formed by the lens system is clear enough and preserved. The true degree is high; the lens system satisfies the following equation:

2ER*tan(FOV/2)>DoD

Wherein, the field of view angle of the lens system is FOV, the exit pupil distance is ER, and the diagonal length of the screen 12 is DoD.

The utility model is equipped with a compact lens structure, which can effectively reduce the overall volume of the VR display device. Through the mutual cooperation of multiple different lenses, the degree of freedom of the overall lens system can be increased, and the values of ER and FOV can be ensured while reducing the screen size. Large enough to effectively ensure the clarity of the formed image and the immersion of the user when using it. The chromatic aberration of the VR lens system is small, so that the image quality observed by the user is high. The main reason is to reduce the size of the VR display device and reduce the size of the screen by reducing the screen size. weight.

Preferably, the outgoing lens 21, the lens group 30 and the incident lens 22 are arranged coaxially, and the outgoing lens 21 is arranged coaxially with the exit pupil 11, that is, the exit pupil 11, the exit lens 21, the lens group 30, the incident lens 22 and the screen 12 are coaxial. The axis setting can further improve the overall imaging effect of the lens system.

Preferably, the diameters of the outgoing lens 21, the incident lens 22, and the lens group 30 are all less than or equal to 45mm, that is, the maximum diameter of all lenses in the lens system is not greater than 45mm, which can ensure that the size of the lens system will not be too large.

Preferably, both the outgoing lens 21 and the incoming lens 22 are concave lenses, and the lens group 30 includes at least one convex lens, which can effectively adjust the optical path of the lens system, ensure the fidelity of the final imaging, and improve the clarity of the image.

The utility model also discloses a compact VR display device, which includes a compact VR lens system described in any one of the above items.

Preferably, the exit lens 21, the lens group 30 and the entrance lens 22 are provided with a rectangular lens barrel, which can effectively reduce the influence of black borders, improve the overall display effect of the VR display device, and enhance the user's sense of immersion.

Embodiment 1, as shown in FIG. 2 , includes an exit pupil 11, an exit lens 21, a lens group 30, an entrance lens 22, and a screen 12 arranged coaxially in sequence, and the lens group 30 sequentially includes the first lens from the exit pupil 11 to the screen 12. , the second lens, the third lens and the fourth lens, and the parameters are designed according to Table 1 below.

Table 1, the design parameter of embodiment one

According to the above table 1, ER=20mm, FOV=60Deg, DoD=22mm can be obtained, and 2ER*tan(FOV/2)=23>22 can be obtained by calculation, satisfying 2ER*tan(FOV/2)>DoD, this embodiment is a full The structure of the glass lens, assuming that the resolution of the screen is FHD, that is, the resolution is 1920*1080, the calculation can be obtained that the length of each pixel in the horizontal direction is 10 μm, and the lateral chromatic aberration is shown in Figure 3. It can be known that three adjacent The pixels of the pixels form a pixel unit, and the total chromatic aberration of the pixel unit may be recognized by the human eye. Therefore, the display effect of a single pixel is better than that of the human eye. It can be seen that the imaging effect of the lens system of this embodiment is good, and the chromatic aberration Small and high definition.

Embodiment 2, as shown in FIG. 4 , includes an exit pupil 11, an exit lens 21, a lens group 30, an entrance lens 22, and a screen 12 arranged coaxially in sequence, and the lens group 30 sequentially includes the first lens from the exit pupil 11 to the screen 12. , the second lens and the third lens, and the parameters are designed according to Table 2 below.

Table 2, the design parameter of embodiment two

According to the above table 2, ER=20mm, FOV=60Deg, DoD=22mm can be obtained, and 2ER*tan(FOV/2)=23>22 can be obtained by calculation, satisfying 2ER*tan(FOV/2)>DoD, this embodiment is glass The structure of the combination of lens and plastic lens, assuming that the resolution of the screen is FHD, that is, the resolution is 1920*1080, the calculation can be obtained that the length of each pixel in the horizontal direction is 10 μm, and the lateral chromatic aberration is shown in Figure 5. It can be known that the three Two adjacent pixels form a pixel unit, and the total chromatic aberration of the pixel unit may be recognized by the human eye. Therefore, the display effect of a single pixel is better than that of the human eye. It can be seen that the imaging effect of the lens system of this embodiment Good, small color difference, high definition.

Embodiment 3, as shown in FIG. 6 , includes an exit pupil 11, an exit lens 21, a lens group 30, an entrance lens 22, and a screen 12 arranged coaxially in sequence, and the lens group 30 sequentially includes the first lens from the exit pupil 11 to the screen 12. , the second lens and the third lens, and the parameters are designed according to Table 3 below.

Table 3, the design parameter of embodiment three

According to the above table 3, ER=20mm, FOV=60Deg, DoD=22mm can be obtained, and 2ER*tan(FOV/2)=23>22 can be obtained by calculation, satisfying 2ER*tan(FOV/2)>DoD, this embodiment is glass The structure of the combination of lens and plastic lens, assuming that the resolution of the screen is FHD, that is, the resolution is 1920*1080, the calculation can be obtained that the length of each pixel in the horizontal direction is 10 μm, and the lateral chromatic aberration is shown in Figure 7. It can be known that the three Two adjacent pixels form a pixel unit, and the total chromatic aberration of the pixel unit may be recognized by the human eye. Therefore, the display effect of a single pixel is better than that of the human eye. It can be seen that the imaging effect of the lens system of this embodiment Good, small color difference, high definition.

Embodiment 4, as shown in FIG. 8 , includes an exit pupil 11, an exit lens 21, a lens group 30, an entrance lens 22, and a screen 12 arranged coaxially in sequence, and the lens group 30 sequentially includes the first lens from the exit pupil 11 to the screen 12. , the second lens, the third lens and the fourth lens, each parameter is designed according to Table 4 below.

Table 4, the design parameter of embodiment one

According to the above table 4, ER=20mm, FOV=60Deg, DoD=22mm can be obtained, 2ER*tan(FOV/2)=23>22 can be obtained through calculation, and 2ER*tan(FOV/2)>DoD can be satisfied. The structure of the plastic lens, assuming that the resolution of the screen is FHD, that is, the resolution is 1920*1080, the calculation can be obtained that the length of each pixel in the horizontal direction is 10 μm, and the lateral chromatic aberration is shown in Figure 9. It can be known that three adjacent The pixels of the pixels form a pixel unit, and the total chromatic aberration of the pixel unit may be recognized by the human eye. Therefore, the display effect of a single pixel is better than that of the human eye. It can be seen that the imaging effect of the lens system of this embodiment is good, and the chromatic aberration Small and high definition.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (8)

1. a kind of compact VR lens systems, emergent pupil (11) and screen (12) including coaxial arrangement, which is characterized in that it is described go out Between pupil (11) and the screen (12) successively be equipped with exit lens (21), lens group (30) and entrance lens (22), it is described go out Lens (21) are penetrated positioned at close to the side of the emergent pupil (11)；

Radius of curvature of the exit lens (21) close to (11) one side surface of emergent pupil is less than 0, the entrance lens (22) Radius of curvature close to (12) one side surface of screen is more than 0；

The lens system meets below equation：

2ER*tan(FOV/2)>DoD

The field angle of the lens system is FOV, distance of exit pupil ER, and the catercorner length of the screen (12) is DoD.

2. a kind of compact VR lens systems according to claim 1, which is characterized in that the exit lens (21), institute Lens group (30) and the entrance lens (22) are stated as coaxial arrangement.

3. a kind of compact VR lens systems according to claim 2, which is characterized in that the exit lens (21) and institute State emergent pupil (11) coaxial arrangement.

4. a kind of compact VR lens systems according to claim 1, which is characterized in that the exit lens (21), institute The diameter for stating entrance lens (22) and the lens group (30) is respectively less than equal to 45mm.

5. a kind of compact VR lens systems according to claim 1, which is characterized in that the exit lens (21) and institute It is concavees lens to state entrance lens (22).

6. a kind of compact VR lens systems according to claim 5, which is characterized in that the lens group (30) is including extremely Few 1 convex lens.

7. a kind of compact VR shows equipment, which is characterized in that compact including one kind described in claim 1~6 any one Type VR lens systems.

8. a kind of compact VR according to claim 7 shows equipment, which is characterized in that the exit lens (21), institute State the lens barrel that rectangle is arranged with outside lens group (30) and the entrance lens (22).