Monolithic imaging AR optical system
By designing a single-chip imaging AR optical system, using concave mirrors and XY polynomial free-curved mirrors, the problem of large space occupancy of existing AR equipment optical systems is solved, and the total distance between glasses and human eyes is achieved Short and compact structure improve the clarity of system imaging.
Patent Information
- Application Number
- CN202411895224.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-21
- Publication Date
- 2025-02-11
AI Technical Summary
The optical systems of existing AR devices occupy a large space, resulting in an increase in product size and bringing inconvenient experience to users.
Design a monolithic imaging AR optical system, and achieve a short total distance between glasses and human eyes by using a concave mirror with positive power and a free-curved mirror with XY polynomial. compact structure.
It is realized that under the premise of ensuring a short pupil distance and a small light path, the total distance between the glasses and the human eye is short, the structure is compact, and the reflector material can be designed according to the needs, with richer choices and clearer system imaging.
Smart Images
Figure CN119414606A_ABST
Abstract
Description
[Technical field]
[0001] The present invention belongs to the technical field of optical imaging, and in particular relates to a single-chip imaging AR optical system. [Background technology]
[0002] With the continuous development of science and technology, people's lives are becoming closely connected with virtual reality technology. At present, head-mounted AR devices continue to appear, but their optical systems occupy a large space, which will increase the overall volume of the product and bring inconvenience to users. This design involves a single-chip imaging AR optical system with the characteristics of short total distance between glasses, screen and human eyes, compact structure, short exit pupil distance, and small optical path. The reflector material can be designed according to needs, and there are many types to choose from. [Summary of the invention]
[0003] In view of the problems existing in the prior art, the present invention provides a monolithic imaging AR optical system, the purpose of which is to achieve a short total distance from the glasses to the human eye and a more compact structure between the screen, glasses and the human eye while ensuring a short exit pupil distance and a small optical path.
[0004] The present invention is achieved through the following technical solutions:
[0005] A single-chip imaging AR optical system, characterized in that the optical system consists of a light-emitting screen (L1), a reflector (L2) is arranged obliquely in front of the light-emitting screen (L1), and a human eye (L3).
[0006] As mentioned above, the single-chip imaging AR optical system is characterized in that: the reflector (L2) is a concave reflector with positive optical power, and the material can be designed according to requirements.
[0007] As mentioned above, the single-chip imaging AR optical system is characterized in that the reflecting surface of the reflector (L2) is a free-form surface of an XY polynomial and satisfies the expression: -24mm≤R2≤-27mm, where R2 is the Y radius of the reflector (L2).
[0008] The monolithic imaging AR optical system as mentioned above is characterized in that: the optical system satisfies the expression: 2mm≤D≤3mm, where D is the entrance pupil diameter.
[0009] The monolithic imaging AR optical system as mentioned above is characterized in that: the optical system satisfies the expression: -14mm≤f≤-16mm; wherein f is the effective focal length of the monolithic imaging AR optical system.
[0010] As mentioned above, the monolithic imaging AR optical system is characterized in that: the optical system satisfies the expressions: 12°<VFOV<14°; 16°<HFOV<18°; 20°<FOV<24°, wherein HFOV is the horizontal field of view angle of the monolithic imaging AR optical system, VFOV is the vertical field of view angle of the monolithic imaging AR optical system, and FOV is the field of view angle.
[0011] In general, the above technical solution conceived by the present invention has the following characteristics compared with the prior art:
[0012] (1) The reflector (L2) of the monolithic imaging AR optical system of the present invention is an XY polynomial, which is conducive to clearer imaging of the system;
[0013] (2) The single-chip imaging AR optical system of the present invention has a small entrance pupil diameter and a compact structure, which meets the requirements of short exit pupil distance and small optical path required for sports glasses;
[0014] (3) The material of the reflector of the single-chip imaging AR optical system of the present invention can be designed according to the requirements, and the choices are more abundant.
Brief Description of the Drawings
[0015] Figure 1 It is a structural schematic diagram of a monolithic imaging AR optical system.
[0016] Figure 2 and Figure 3 They are the YZ direction view and the XZ direction view respectively.
[0017] Figure 4 It is the MTF diagram of the single-chip imaging AR optical system.
[0018] Figure 5 It is the distortion curve of the single-chip imaging AR optical system.
[0019] Figure 1 Among them, L1 is the light-emitting screen; L2 is the reflector; and L3 is the human eye. [Specific implementation plan]
[0020] The following contents are specific embodiments of the present invention.
[0021] 1. A single-chip imaging AR optical system, characterized in that it comprises a light-emitting screen (L1), wherein a reflector (L2) is disposed obliquely in front of the light-emitting screen (L1).
[0022] 2. The single-chip imaging AR optical system according to claim 1 is characterized in that: the reflector (L2) is a concave reflector with positive optical power, and its material can be designed according to requirements.
[0023] 3. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that the reflection surface of the reflector (L2) is a free-form surface of an XY polynomial and satisfies the expression:
[0024] -24mm≤R2≤-27mm;
[0025] Where R2 is the Y radius of the reflector (L2).
[0026] 4. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that the optical system satisfies the expression:
[0027] 2mm≤D≤3mm;
[0028] Where D is the entrance pupil diameter.
[0029] 5. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that the optical system satisfies the expression:
[0030] -14mm≤f≤-16mm;
[0031] Where f is the effective focal length of the monolithic imaging AR optical system.
[0032] 6. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that the optical system satisfies the expression:
[0033] 12°<VFOV<14°; 16°<HFOV<18°; 20°<FOV<24°
[0034] Among them, HFOV is the horizontal field of view angle of the single-chip imaging AR optical system, VFOV is the vertical field of view angle of the single-chip imaging AR optical system, and FOV is the field of view angle.
[0035] In the lens data table of this embodiment, the units of the radius of curvature and thickness are mm.
[0036] Figure 1 It is a schematic diagram of the structure of a monolithic imaging AR optical system; Figure 2 and Figure 3 They are the YZ direction view and the XZ direction view; Figure 4 It is the MTF diagram of the monolithic imaging AR optical system; Figure 5 It is the distortion curve of the single-chip imaging AR optical system.
[0037] Table 1 Structural parameters of a single-chip imaging AR optical system
[0038]
[0039] Table 2 XY polynomial free-form surface parameter table
[0040]
[0041]
[0042] The above content is only an illustration of the best implementation case of the content of the present invention, and does not limit the content of the present invention. Any modifications made within the design and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A monolithic imaging AR optical system, characterized in that: The optical system consists of a light-emitting screen (L1), a reflector (L2) arranged obliquely in front of the light-emitting screen (L1), and a human eye (L3).
2. The monolithic imaging AR optical system according to claim 1, characterized in that: The reflector (L2) is a concave reflector with positive optical power, and its material can be designed according to requirements.
3. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that: The reflecting surface of the reflecting mirror (L2) is a free-form surface of an XY polynomial and satisfies the expression: -24mm≤R2≤-27mm; Where R2 is the Y radius of the reflector (L2).
4. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that The optical system satisfies the expression: 1.5mm≤D≤3mm; Where D is the entrance pupil diameter.
5. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that The optical system satisfies the expression: -14mm≤f≤-16mm; Where f is the effective focal length of the monolithic imaging AR optical system.
6. The monolithic imaging AR optical system according to claim 1 or 2, characterized in that The optical system satisfies the following expressions: 12°<VFOV<14°; 16°<HFOV<18°; 20°<FOV<24° Among them, HFOV is the horizontal field of view angle of the single-chip imaging AR optical system, VFOV is the vertical field of view angle of the single-chip imaging AR optical system, and FOV is the field of view angle.