Monolithic imaging AR optical system
By designing a monolithic imaging AR optical system, using an XY polynomial freeform concave mirror and a moderate entrance pupil diameter, the problems of large optical system size and limited material selection were solved, achieving a compact structure and clear imaging.
Patent Information
- Application Number
- CN202423165169.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-21
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-21
AI Technical Summary
The optical systems of existing AR devices occupy a large space, resulting in increased product size, poor user experience, and limited choice of reflector materials.
Design a monolithic imaging AR optical system that uses a concave reflector with positive optical power. The reflector is an XY polynomial freeform surface with a small entrance pupil diameter, moderate effective focal length and field of view. The reflector material can be designed according to requirements.
It achieves a compact structure between the glasses and the human eye, with a small entrance pupil diameter, clear imaging, and a variety of reflective mirror materials, meeting the requirements of short exit pupil distance and small optical path for sports glasses.
Smart Images
Figure CN223551957U_ABST
Abstract
Description
[Technical Field]
[0001] This invention belongs to the field of optical imaging technology, and specifically relates to a single-chip imaging AR optical system. [Background Technology]
[0002] With the continuous development of technology, people's lives are becoming increasingly intertwined with virtual reality technology. Currently, head-mounted AR devices are constantly emerging, but their optical systems occupy a large space, increasing the overall size of the product and causing inconvenience for users. This design involves a monolithic imaging AR optical system characterized by a short total distance between the glasses, screen, and human eye, a compact structure, a short exit pupil distance, and a small optical path. The reflector material can be designed according to requirements, with a variety of options available. [Summary of the Invention]
[0003] To address the problems existing in the prior art, this invention provides a monolithic imaging AR optical system, which aims to achieve a shorter total distance between the glasses and the human eye, and a more compact structure between the screen, glasses, and human eye, while ensuring a short exit pupil distance and a small optical path.
[0004] This invention is achieved through the following technical solution:
[0005] A single-chip imaging AR optical system is characterized in that: the optical system consists of a light-emitting screen (L1), a reflector (L2) disposed diagonally in front of the light-emitting screen (L1), and a human eye (L3).
[0006] The single-chip imaging AR optical system described above 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] The single-chip imaging AR optical system described above is characterized in that: the reflecting surface of the reflector (L2) is a freeform surface of XY polynomial, and satisfies the expression: -24mm≤R2≤-27mm, where R2 is the Y radius of the reflector (L2).
[0008] The single-chip imaging AR optical system described 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 described above is 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.
[0010] The monolithic imaging AR optical system described above is characterized in that: the optical system satisfies the following expressions: 12° < VFOV < 14°; 16° < HFOV < 18°; 20° < FOV < 24°, where HFOV is the horizontal field of view of the monolithic imaging AR optical system, VFOV is the vertical field of view of the monolithic imaging AR optical system, and FOV is the field of view.
[0011] In general, the technical solutions conceived by this invention have 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 of the XY polynomial, which is beneficial to clearer system imaging;
[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 by sports glasses.
[0014] (3) The reflector material of the monolithic imaging AR optical system of the present invention can be designed according to requirements, and a wider range of choices are available. [Attached Image Description]
[0015] Figure 1 This is a schematic diagram of a single-chip imaging AR optical system.
[0016] Figure 2 and Figure 3 These are the YZ direction view and the XZ direction view, respectively.
[0017] Figure 4 This is the MTF diagram of a monolithic imaging AR optical system.
[0018] Figure 5 It is the distortion curve of a single-chip imaging AR optical system.
[0019] Figure 1 In the diagram, L1 is the light-emitting screen; L2 is the reflector; and L3 is the human eye. [Detailed Implementation Plan]
[0020] The following are specific embodiments of the present invention.
[0021] 1. A single-chip imaging AR optical system, characterized in that: it includes a light-emitting screen (L1), and a reflector (L2) is provided diagonally in front of the light-emitting screen (L1).
[0022] 2. The single-chip imaging AR optical system according to claim 1, wherein 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 reflecting surface of the mirror (L2) is a freeform surface of XY polynomial, and satisfies the expression:
[0024] -24mm≤R2≤-27mm;
[0025] Where R2 is the Y radius of the reflecting mirror (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] Where HFOV is the horizontal field of view of the monolithic imaging AR optical system, VFOV is the vertical field of view of the monolithic imaging AR optical system, and FOV is the field of view.
[0035] In the lens data sheet of this embodiment, the units for radius of curvature and thickness are mm.
[0036] Figure 1 This is a schematic diagram of the structure of a single-chip imaging AR optical system; Figure 2 and Figure 3 These are the YZ direction view and the XZ direction view, respectively. Figure 4 This is the MTF diagram of a single-chip imaging AR optical system; Figure 5 It is the distortion curve of a single-chip imaging AR optical system.
[0037] Table 1. Structural parameters of a single-chip imaging AR optical system.
[0038]
[0039] Table 2. Parameters of XY Polynomial Freeform Surface
[0040]
[0041]
[0042] The above content is merely an illustration of the preferred implementation of the present invention and is not intended to limit the scope of the present invention. Any modifications made within the design and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A single-chip imaging AR optical system, comprising a light-emitting screen (L1), a reflector (L2) disposed obliquely in front of the light-emitting screen (L1), and a human eye (L3), characterized in that... This monolithic imaging AR optical system satisfies the following expression: 1.5mm≤D≤3mm; -14mm≤f≤-16mm; 12°<VFOV<14°; 16°<HFOV<18°; 20°<FOV<24° Where D is the entrance pupil diameter; f is the effective focal length of the monolithic imaging AR optical system; HFOV is the horizontal field of view of the monolithic imaging AR optical system; VFOV is the vertical field of view of the monolithic imaging AR optical system; and FOV is the field of view.
2. The monolithic imaging AR optical system according to claim 1, characterized in that: The reflecting mirror (L2) is a concave reflecting mirror with positive optical power. Its reflecting surface is a freeform surface of the XY polynomial, and satisfies the expression: -24mm≤R2≤-27mm; R2 is the Y-radius of the reflector (L2), and the material of the reflector (L2) can be designed according to requirements.