Two-piece type imaging AR optical system

Abstract

A two-piece type imaging AR optical system is characterized in that the two-piece type imaging AR optical system comprises a light-emitting screen (L1), a first lens (L2) is arranged in the oblique front of the light-emitting screen (L1), a reflector (L3) is arranged in the oblique front of the first lens (L2), the first lens (L2) is a plastic lens with negative focal power, and the reflector (L3) is a concave reflector with positive focal power and is made of a plastic material. The reflecting surface of the reflecting mirror (L3) is a free-form surface of an XY polynomial and meets the expression that R3 is more than or equal to-24mm and less than or equal to-28mm; -15 < = f / D4 < =-9; fOV is larger than 85 degrees and smaller than 90 degrees; the two-piece type imaging AR optical system has the advantages of being capable of achieving clear imaging, small in light path, short in exit pupil distance and the like under the condition of being compatible with 500-degree myopia of human eyes.

Description

[Technical Field]

[0001] This invention belongs to the field of optical imaging technology, and more specifically, relates to a two-piece imaging AR optical system. [Background Technology]

[0002] With the continuous development of technology, virtual reality and augmented reality technologies are widely used. Currently, people mostly use head-mounted AR devices, but ordinary head-mounted devices have high requirements for their structure, small size, and image clarity, and the experience is poor for nearsighted people who wear glasses. This patent aims to achieve clear imaging, a small optical path, and a short exit pupil distance even for people with 500 degrees of myopia, thereby enhancing the experience of using sports glasses. [Summary of the Invention]

[0003] To address the problems existing in the prior art, this invention provides a two-piece imaging AR optical system, which aims to achieve clear imaging, small optical path, and short exit pupil distance even when the human eye is 500 degrees myopic, thereby enhancing people's experience with sports glasses.

[0004] This invention is achieved through the following technical solution:

[0005] A two-piece imaging AR optical system is characterized in that it includes a light-emitting screen (L1), a first lens (L2) is provided in front of the light-emitting screen (L1), and a reflector (L3) is provided in front of the first lens (L2).

[0006] The two-piece imaging AR optical system described above is characterized in that: the first lens (L2) is a plastic lens with negative optical power, and the reflector (L3) is a concave reflector with positive optical power and is made of plastic material.

[0007] The two-piece imaging AR optical system described above is characterized in that: the reflecting surface of the reflector (L3) is a freeform surface of XY polynomial, and satisfies the expression: -24mm≤R3≤-28mm, where R3 is the Y radius of the reflector (L3).

[0008] The two-piece imaging AR optical system described above is characterized by satisfying the expression: -15≤f / D4≤-9; where f is the effective focal length of the entire two-piece imaging AR optical system and D4 is the diameter of the entrance pupil.

[0009] The two-piece imaging AR optical system described above is characterized by satisfying the expression: 85° < FOV < 90°, where FOV is the field of view of the two-piece imaging AR optical system.

[0010] In general, the technical solutions conceived by this invention have the following characteristics compared with the prior art:

[0011] (1) The reflector (L3) of the two-piece imaging AR optical system of the present invention is a free-form surface, which is beneficial to the system imaging being clearer;

[0012] (2) The field of view of the two-piece imaging AR optical system of the present invention is greater than 80° and is compatible with myopic eyes of 500 degrees, which enables the system to have a better field of view and improve the user's experience quality.

[0013] (3) The two-piece imaging AR optical system of the present invention has a small entrance pupil diameter, which meets the requirements of short exit pupil distance and small optical path space required by sports glasses.

[0014] (4) The lenses of the two-piece imaging AR optical system of the present invention are all made of plastic material, which is lower in cost than ordinary sports glasses. [Attached Image Description]

[0015] Figure 1 This is a schematic diagram of a two-piece imaging AR optical system.

[0016] Figure 2 This is the MTF diagram of a two-piece imaging AR optical system.

[0017] In the diagram: L1 is the light-emitting screen; L2 is the first lens; L3 is the reflecting mirror (L3); L4 is the human eye.

Detailed Implementation Methods

[0018] The following are specific embodiments of the present invention.

[0019] 1. A two-piece imaging AR optical system, characterized in that: it includes a light-emitting screen (L1), a first lens (L2) is provided obliquely in front of the light-emitting screen (L1), and a reflector (L3) is provided obliquely in front of the first lens (L2).

[0020] 2. The two-piece imaging AR optical system according to claim 1, characterized in that: the first lens (L2) is a plastic lens with negative optical power, and the reflector (L3) is a concave reflector with positive optical power and is made of plastic material.

[0021] 3. The two-piece imaging AR optical system according to claim 1 or 2, characterized in that: the reflecting surface of the reflector (L3) is a freeform surface of XY polynomial, and satisfies the expression:

[0022] -24mm≤R3≤-28mm;

[0023] Where R3 is the Y radius of the reflecting mirror (L3).

[0024] 4. The two-piece imaging AR optical system according to claim 1 or 2, characterized in that the optical system satisfies the expression:

[0025] -15≤f / D4≤-9;

[0026] Where f is the effective focal length of the entire two-piece imaging AR optical system, and D4 is the diameter of the entrance pupil.

[0027] 5. The two-piece imaging AR optical system according to claim 1 or 2, characterized in that the optical system satisfies the expression:

[0028] 85° < FOV < 90°, where FOV is the field of view of the two-piece imaging AR optical system.

[0029] In the lens data sheet of this embodiment, the units for radius of curvature and thickness are mm.

[0030] Figure 1 This is a schematic diagram of a two-piece imaging AR optical system. Figure 2 This is the MTF diagram of a two-piece imaging AR optical system.

[0031] The following table is a parameter table for the embodiment.

[0032] Table 1. Structural parameters of a two-piece imaging AR optical system

[0033]

[0034] Table 2. Eccentricity Setting Parameters for a Two-Piece Imaging AR Optical System

[0035] Surface number α β γ Eccentric method Aperture -4.00E+01 0.00E+00 0.00E+00 Eccentricity and regression 2 -2.20E+01 1.50E+01 0.00E+00 Eccentricity and curvature 3 -3.84E+00 0.00E+00 0.00E+00 Eccentricity and regression 4 -3.84E+00 0.00E+00 0.00E+00 Eccentricity and regression Image 1.41E+01 9.87E+00 0.00E+00 Eccentricity and regression

[0036] Table 3. XY polynomial surface coefficients of a two-piece imaging AR optical system.

[0037]

[0038]

[0039] Table 4. Qcon Aspheric Coefficients of a Two-Piece Imaging AR Optical System

[0040]

[0041] 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 two-chip imaging AR optical system, characterized in that: It includes a light-emitting screen (L1), a first lens (L2) is provided in front of the light-emitting screen (L1), and a reflector (L3) is provided in front of the first lens (L2); the first lens (L2) is a plastic lens with negative optical power, and the reflector (L3) is a concave reflector with positive optical power and is made of plastic material. The reflecting surface of the mirror (L3) is a freeform surface of XY polynomial, and satisfies the expression: -24mm≤R3≤-28mm; Where R3 is the Y radius of the reflecting mirror (L3); The two-piece imaging AR optical system described above satisfies the following expression: -15≤f / D4≤-9; Where f is the effective focal length of the entire two-piece imaging AR optical system, and D4 is the diameter of the entrance pupil; The two-piece imaging AR optical system described above satisfies the following expression: 85° < FOV < 90°; Here, FOV is the field of view of a two-piece imaging AR optical system.

Images