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] The present 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 science and technology, virtual reality and augmented reality technologies are widely used by people. At present, people are more likely to wear head-mounted AR devices on their heads, but ordinary head-mounted devices have high requirements for their structure, small size, and clarity, and head-mounted devices have a poor experience for myopic people wearing glasses. In order to pursue the characteristics of clear imaging, small optical path, short exit pupil distance, etc. under the condition of 500-degree myopia of the human eye, enhance people's experience of sports glasses. This patent will further explain. [Summary of the invention]

[0003] In view of the problems existing in the prior art, the present invention provides a two-piece imaging AR optical system, which aims to achieve the characteristics of clear imaging, small optical path, short exit pupil distance, etc. while being compatible with 500-degree myopia of the human eye, so as to enhance people's experience of sports glasses.

[0004] The present invention is achieved through the following technical solutions:

[0005] A two-piece imaging AR optical system, characterized in that it comprises 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).

[0006] The two-piece imaging AR optical system as 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] As mentioned above, the two-piece imaging AR optical system is characterized in that the reflecting surface of the reflector (L3) is a free-form surface of an XY polynomial and satisfies the expression: -24mm≤R3≤-28mm, where R3 is the Y radius of the reflector (L3).

[0008] As mentioned above, the two-piece imaging AR optical system is characterized in that the optical system satisfies the expression: -15≤f / D4≤-9; wherein 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] As mentioned above, the two-piece imaging AR optical system is characterized in that the optical system satisfies the expression: 85°<FOV<90°, wherein FOV is the field of view angle of the two-piece imaging AR optical system.

[0010] In general, the above technical solution conceived by the present invention has 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 conducive to clearer imaging of the system;

[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 human eyes up to 500 degrees, which can enable the system to have a better field of view and improve the user 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.

Brief Description of the Drawings

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

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

[0017] In the figure: L1 is the light-emitting screen; L2 is the first lens; L3 is the reflector (L3); L4 is the human eye. [Specific implementation method]

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

[0019] 1. A two-piece imaging AR optical system, characterized in that it comprises 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 reflection surface of the reflector (L3) is a free-form surface of an XY polynomial and satisfies the expression:

[0022] -24mm≤R3≤-28mm;

[0023] Where R3 is the Y radius of the reflector (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] Among them, 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 table of this embodiment, the units of the radius of curvature and thickness are mm.

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

[0031] The following table is a parameter table of the embodiment

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

[0033]

[0034] Table 2: Eccentricity setting parameters of 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 bending 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 plane 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 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 two-piece imaging AR optical system, characterized by: The invention comprises a light-emitting screen (L1), wherein a first lens (L2) is arranged obliquely in front of the light-emitting screen (L1), and a reflecting mirror (L3) is arranged obliquely in front of the first lens (L2).

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.

3. The two-piece imaging AR optical system according to claim 1 or 2, characterized in that: The reflecting surface of the reflecting mirror (L3) is a free-form surface of an XY polynomial and satisfies the expression: -24mm≤R3≤-28mm; Where R3 is the Y radius of the reflector (L3).

4. The two-piece imaging AR optical system according to claim 1 or 2, characterized in that The optical system satisfies the expression: -15≤f / D4≤-9; Among them, f is the effective focal length of the entire two-piece imaging AR optical system, and D4 is the diameter of the entrance pupil.

5. The two-piece imaging AR optical system according to claim 1 or 2, characterized in that The optical system satisfies the expression: 85°<FOV<90°; Among them, FOV is the field of view of the two-piece imaging AR optical system.

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