A free-form surface reflective eyepiece optical system and device thereof

Abstract

The invention relates to a free-form surface reflective eyepiece optical system and equipment, and to the field of optical technology. The optical system comprises an imaging system, an illumination system and a detection system. The imaging system and the illumination system are arranged in sequence along an optical axis away from a human eye, and the detection system is located between the human eye and the imaging system. Alternatively, the imaging system and the detection system are arranged in sequence along an optical axis away from a human eye, and the illumination system is located between the human eye and the imaging system. The imaging system comprises a first lens and a second lens arranged in sequence along the optical axis away from the human eye, and a first optical lens group located on the optical axis of a micro display and between the first lens and the second lens. The second lens is a free-form surface semi-transparent and semi-reflective lens. The systems can be freely switched and rotated, a fundus light-enhancing illumination system and a fundus detection system are added, the eye condition is monitored in real time, intelligent adjustment is achieved, the fundus imaging effect is higher, and the volume of the entire optical system is reduced.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and more specifically to a free-form surface reflective eyepiece optical system and equipment. Background Art

[0002] With the continuous development of electronic devices towards ultra-miniaturization, as well as the development of new computers, microelectronics, optoelectronic devices and communication theories and technologies, wearable computing, a new model based on "people-oriented" and "human-machine integration", has become possible. Applications are constantly emerging in the fields of military, industry, medical care, education, and consumption. In a typical wearable computing system architecture, a head-mounted display device is a key component. The head-mounted display device uses optical technology to guide the video image light emitted by a micro-image microdisplay (such as a transmissive or reflective liquid crystal microdisplay, an organic electroluminescent device, or a DMD device) to the user's pupil, and realizes virtual and magnified images within the user's near-eye range, providing the user with intuitive and visible images, videos, and text information. At the same time, it can monitor the state of the human eye in real time, make corresponding effect fine-tuning, further improve the experience, and prevent ophthalmic diseases.

[0003] The free-form surface reflective fundus imaging feedback display optical eyepiece device is developing in the direction of compact size, light weight, easy to wear on the head, and reduced load. At the same time, the display end optical lens group and the free-form surface reflective lens constitute a free-form surface reflective optical eyepiece system, which can perform fundus illumination, fundus detection and feedback functions. The fundus feedback optical system provided by the present invention has the characteristics of compact structure and small size due to the use of the same component in multiple subsystems, and the interaction of the light source, micro-display, micro-imager optical detector, optical lens group, free-form surface reflector and plane reflective lens can achieve the advantage of real-time monitoring of eye conditions, and further realize the function of intelligent adjustment with this advantage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a free-form reflective eyepiece optical system and a device that uses a new optical surface technology to achieve high-quality real-time detection and feedback of fundus conditions in response to the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a free-form surface reflective eyepiece optical system, including an imaging system, an illumination system and a detection system; the imaging system and the illumination system are arranged in sequence along the direction of the optical axis away from the human eye, and the detection system is located between the human eye and the imaging system; or, the imaging system and the detection system are arranged in sequence along the direction of the optical axis away from the human eye, and the illumination system is located between the human eye and the imaging system;

[0006] The imaging system comprises a first lens and a second lens arranged in sequence from a human eye along an optical axis away from the human eye, and a first optical lens group located on the optical axis of the micro display and between the first lens and the second lens; the second lens is a free-form surface semi-transparent and semi-reflective lens; the center distance between the free-form surface optical surface of the second lens close to the human eye and the human eye is fd, the optical effective diameter range of the free-form surface optical surface of the second lens is D, and fd and D satisfy the following relationship (1):

[0007] 0.71≤fd / D≤1.9 (1).

[0008] Furthermore, the first lens is a plane semi-transparent and semi-reflective lens; the angle between the first lens and the optical axis at the human eye is ξ, and the size of ξ satisfies the following relationship (2):

[0009] 55°<ξ<170° (2).

[0010] Furthermore, the angle between the central axis of the second lens and the optical axis of the human eye is β, and the value of β satisfies the following relationship (3):

[0011] -20°<β<30° (3).

[0012] Furthermore, the microdisplay is located between the second lens and the human eye; the angle between the optical axis of the microdisplay and the optical axis of the human eye is λ, and the magnitude of the angle λ satisfies the following relation (4):

[0013] 25°≤λ≤55° (4).

[0014] Furthermore, the full field angle of the optical system is 2ω, and 2ω satisfies the following relationship (5):

[0015] 2ω≥20° (5).

[0016] Further, the detection system includes a COMS receiver and a second optical lens group; the second optical lens group is located on the optical axis of the COMS receiver; the lighting system includes an illumination light source;

[0017] Wherein, the angle between the optical axis of the COMS receiver and the optical axis at the human eye is θ; or the angle between the optical axis of the illumination light source and the optical axis at the human eye is θ;

[0018] The size of the angle θ satisfies the following relation (6):

[0019] 10°<θ<50° (6).

[0020] Furthermore, the illumination light source is a light source in any range of ultraviolet light band, visible light band and infrared light band.

[0021] Furthermore, the COMS receiver is an imaging optical device or a light energy detection optical device.

[0022] Furthermore, the detection system and the illumination system are symmetrically arranged along a central axis formed by an angle between the optical axis of the COMS receiver and the optical axis of the illumination light source.

[0023] The present invention also provides a free-form surface reflective eyepiece optical device, comprising an eyepiece optical system as described in any one of the above items.

[0024] The beneficial effects of the present invention are as follows: a free-form surface reflective eyepiece optical system provided by the present invention can freely switch and rotate and adjust among the lighting system, the detection system and the imaging system by setting them, and adopts the method of using the same component for multiple subsystems to achieve the characteristics of compact structure and small size, and by setting the free-form surface semi-transparent and semi-reflective lens, the fundus light-enhancing lighting system and the fundus detection system are added, which can achieve the advantage of real-time monitoring of the eye condition and further realize the function of intelligent adjustment; it achieves a high-performance fundus imaging effect, and overcomes the relatively more complex and bulky optical systems of previous fundus cameras; under the premise of the same optical effect, the new optical surface shape can further reduce the volume of the entire optical system, making it more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work:

[0026] Figure 1 It is a schematic structural diagram of a free-form surface reflective eyepiece optical system according to the first embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a free-form surface semi-transparent and semi-reflective lens according to a first embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a free-form surface reflective eyepiece optical system according to a second embodiment of the present invention;

[0029] Figure 4 It is a schematic structural diagram of a free-form surface reflective eyepiece optical system according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0031] The present invention constructs a free-form surface reflective eyepiece optical system, comprising an imaging system, an illumination system and a detection system; the imaging system and the illumination system are arranged in sequence along the direction of the optical axis away from the human eye, and the detection system is located between the human eye and the imaging system; or the imaging system and the detection system are arranged in sequence along the direction of the optical axis away from the human eye, and the illumination system is located between the human eye and the imaging system; the positions of the illumination system, the imaging system and the detection system can be freely switched and adjusted by knobs, so that more structural requirements can be met more flexibly and the functions of various optical components are fully utilized;

[0032] The imaging system comprises a first lens and a second lens arranged in sequence from a human eye along an optical axis away from the human eye, and a first optical lens group 4 located on the optical axis of a micro display and between the first lens 1 and the second lens 2; the distance between the micro display and the first optical lens group 4 is adjustable; the second lens 2 is a free-form surface semi-transparent and semi-reflective lens; the center distance between the free-form surface optical surface of the second lens 2 close to the human eye and the human eye is fd, the optical effective diameter range of the free-form surface optical surface of the second lens 2 is D, and the following relationship (1) is satisfied between fd and D:

[0033] 0.71≤fd / D≤1.9 (1);

[0034] That is, fd / D can be 0.71, 0.82, 0.89, 0.93, 0.99, 1.56, 1.63, 1.9, and so on.

[0035] In the above embodiment, the free-form surface of the second lens 2 satisfies the following relationship:

[0036]

[0037] Among them, z is the sag, c is the curvature, k is the cone coefficient, and r is the radius range.

[0038] In a further embodiment, the first lens 1 is a plane semi-transparent and semi-reflective lens; the angle between the first lens 1 and the optical axis at the human eye is ξ, and the magnitude of ξ satisfies the following relation (2):

[0039] 55°<ξ<170° (2);

[0040] That is, the ξ value can be 55°, 82°, 95°, 121°, 153°, 170°, and so on.

[0041] In a further embodiment, the angle between the central axis of the second lens 2 and the optical axis at the human eye is β, and the magnitude of β satisfies the following relation (3):

[0042] -20°<β<30° (3);

[0043] That is, the value of β can be -20°, -19.9°, -10.5°, 0°, 10.3°, 15°, 27°, 30°, and so on.

[0044] In a further embodiment, the microdisplay is located between the second lens 2 and the human eye; the angle between the optical axis of the microdisplay and the optical axis of the human eye is λ, and the magnitude of the angle λ satisfies the following relation (4):

[0045] 25°≤λ≤55° (4);

[0046] That is, the value of λ can be 25°, 30.5°, 37°, 44.3°, 48°, 53°, 55°, and so on.

[0047] In a further embodiment, the full field angle of the optical system is 2ω, and 2ω satisfies the following relationship (5):

[0048] 2ω≥20° (5).

[0049] In a further embodiment, the detection system includes a COMS receiver 5 and a second optical lens group 3; the second optical lens group 3 is located on the optical axis of the COMS receiver 5; the illumination system includes an illumination light source 6;

[0050] The angle between the optical axis of the COMS receiver 5 and the optical axis at the human eye is θ; or the angle between the optical axis of the illumination light source 6 and the optical axis at the human eye is θ;

[0051] The size of the angle θ satisfies the following relationship (6):

[0052] 10°<θ<50° (6);

[0053] That is, the θ value can be 10°, 11°, 17°, 25°, 30°, 45°, 50°, etc.

[0054] In a further embodiment, the illumination light source 6 is a light source in any range of ultraviolet light band, visible light band and infrared light band.

[0055] In a further embodiment, the COMS receiver 5 is an imaging optical device or a light energy detection optical device.

[0056] In a further embodiment, the detection system and the lighting system are symmetrically arranged along the central axis of the angle formed by the optical axis of the COMS receiver 5 and the optical axis of the lighting light source 6; the COMS receiver 5 and the lighting light source 6 are symmetrically arranged along the central axis of the angle formed by their respective optical axes, and the positions of the COMS receiver 5 and the second optical lens group 3 can be interchanged with the lighting light source 6.

[0057] The present invention is further described below in conjunction with specific implementation methods.

[0058] Embodiment 1

[0059] Table 1 Figure 1 The parameters of the free-form surface of the optical system shown

[0060] Normalized radius 100 The coefficient of the X1Y0 term -0.039638512 The coefficient of the X0Y1 term -32.173457 X2Y0 coefficient -13.828026 The coefficient of the X1Y1 term -0.74085458 The coefficient of the X0Y2 term 30.167712 X3Y0 coefficient 3.5692779 The coefficient of the X2Y1 term 702.51128 The coefficient of the X1Y2 term 3.088643 The coefficient of X0Y3 -254.61643

[0061] Table 1 is as follows Figure 1 The parameters of the free-form surface of the optical system shown, Figure 2 The free-form surface semi-transparent and semi-reflective lens is a schematic diagram of a free-form surface reflective optical eyepiece system, which includes a human eye, an illumination light source 6, a microdisplay, a COMS receiver 5, a first optical lens group 4, a second optical lens group 3, a first lens 1, and a second lens 2; wherein the first lens 1 is a plane semi-transparent and semi-reflective lens, the second lens 2 is a free-form surface semi-transparent and semi-reflective lens, and the free-form surface optical surface in the second lens 2 is a polynomial free-form surface. The plane semi-transparent and semi-reflective lens is located between the human eye and the free-form surface semi-transparent and semi-reflective lens, and the angle between the plane semi-transparent and semi-reflective lens and the optical axis at the human eye is ξ, and the value of ξ is 121°. The plane semi-transparent and semi-reflective lens is located between the human eye and the free-form surface semi-transparent and semi-reflective lens, the illumination light source 6 is above the semi-transparent and semi-reflective plane lens, and the angle between the optical axis at the COMS receiver 5 and the optical axis at the human eye is θ, and the value of θ is 78°. The angle between the central axis of the second lens 2 and the central axis of the human eye is β, and the value of β is 58°. The angle between the position of the micro display on the side of the concave surface of the second lens 2 and the central axis of the human eye is λ, and the value of λ is 84°. Among them, the first lens 1, the second lens 2 and the first optical lens group 4 are all independent lenses.

[0062] The first optical lens group 4 and the free-form surface semi-transparent and semi-reflective lens form a free-form surface reflective optical eyepiece system, which can perform fundus illumination, fundus detection and feedback functions.

[0063] Embodiment 2

[0064] like Figure 3The free-form surface reflective optical eyepiece system shown is different from the first embodiment in that it is a free-form surface reflective optical eyepiece system, including a human eye, an illumination light source 6, a microdisplay, a COMS receiver 5, a first optical lens group 4, a second optical lens group 3, a first lens 1 and a second lens 2, wherein the first lens 1 is a plane semi-transparent and semi-reflective lens; the second lens 2 is a free-form surface semi-transparent and semi-reflective lens. The plane semi-transparent and semi-reflective lens is located between the human eye and the free-form surface semi-transparent and semi-reflective lens, and the angle between the plane semi-transparent and semi-reflective lens and the optical axis at the human eye is ξ, and the value of ξ is 121°. The illumination light source 6 is above, and the angle between the central axis of the plane semi-transparent and semi-reflective lens and the optical axis at the human eye is θ, and the value of θ is 78°. The angle between the central axis of the second lens 2 and the optical axis at the human eye is β, and the value of β is 58°. The angle between the position of the microdisplay on one side of the concave surface of the second lens 2 and the optical axis at the human eye is λ, and the value of λ is 84°. The COMS receiver 5 is located behind the free-form surface lens along the optical axis from the human eye. The COMS receiver 5 and the illumination light source 6 are symmetrical about the reflection plane of the plane semi-transparent and semi-reflective lens, and the COMS receiver 5 and the first optical lens group 3 can be interchanged with the positions of the illumination light source 6; wherein, the first lens 1, the second lens 2 and the first optical lens group 4 are all independent lenses.

[0065] The first optical lens group 4 and the free-form surface semi-transparent and semi-reflective lens form a free-form surface reflective optical eyepiece system, which can perform fundus illumination, fundus detection and feedback functions.

[0066] Embodiment 3

[0067] Table 2 Figure 4 The parameters of the free-form surface of the optical system shown

[0068] Normalized radius 1.049e+42 The coefficient of the X1Y0 term -2.077e+38 The coefficient of the X0Y1 term -2.3e+40 X2Y0 coefficient 2.384e+81 The coefficient of the X1Y1 term 6.754e+78 The coefficient of the X0Y2 term 1.0897e+81 X3Y0 coefficient 1.59e+120 The coefficient of the X2Y1 term -4.109e+120 The coefficient of the X1Y2 term 3.82e+119 The coefficient of X0Y3 -5.264e+120 Coefficient of X4Y0 5.885e+161 The coefficient of the X3Y1 term 5.935e+160 The coefficient of the X2Y2 term 3.885e+161 Coefficient of X1Y3 1.082e+160 Coefficient of X0Y4 1.1912e+161

[0069] Table 2 is as follows Figure 4The parameters of the free-form surface of the optical system shown are different from those of the first and second embodiments mainly in that a free-form surface reflective optical eyepiece system is formed, including a human eye, an illumination light source, a microdisplay, a COMS receiver 5, a first optical lens group 4, a second optical lens group 3, a first lens 1 and a second lens 2, wherein the first lens 1 is a plane semi-transparent and semi-reflective lens; the second lens 2 is a free-form surface semi-transparent and semi-reflective lens. The position of the plane semi-transparent and semi-reflective lens is between the human eye and the second lens 2, and the angle between the plane semi-transparent and semi-reflective lens and the optical axis at the human eye is ξ (as shown in the figure), and the value of ξ is 80°. The illumination light source 6 is to the right of the plane semi-transparent and semi-reflective lens, and the angle between the central axis of the COMS receiver 5 and the optical axis at the human eye is θ, and the value of θ is 78°. The angle between the central axis of the second lens 2 and the optical axis at the human eye is β, and the value of β is 20°. The angle between the position of the microdisplay on one side of the concave surface of the second lens 2 and the optical axis at the human eye is λ, and the value of λ is 119°. The first optical lens group 4, the first lens 1 and the second lens 2 can be mounted as one optical component, and the main optical surface of the second optical lens group 4 is a free-form surface, and its parameters are shown in the following table:

[0070] Table 3 Free-form surface parameters of the first optical lens group

[0071] Normalized radius -3171466.3 The coefficient of the X1Y0 term -7318.259 The coefficient of the X0Y1 term 31402.379 X2Y0 coefficient -1.825e+10 The coefficient of the X1Y1 term -1.405e+09 The coefficient of the X0Y2 term 2.06e+10 X3Y0 coefficient 5.0e+14

[0072] Table 3 shows the free-form surface parameters of the first optical lens group 4. The first optical lens group 4 and the free-form surface semi-transparent and semi-reflective lens constitute a free-form surface reflective optical eyepiece system, which can perform fundus illumination, fundus detection and feedback functions.

[0073] In another embodiment, the present invention also provides a free-form surface reflective eyepiece optical device, comprising any one of the eyepiece optical systems described above; the device adopts an eyepiece optical system in which the positions of the illumination system, the detection system and the imaging system can be freely switched and rotated, and a method of using the same component for multiple subsystems is adopted to achieve the characteristics of compact structure and small size of the eyepiece optical device. By adopting a free-form surface semi-transparent and semi-reflective lens, a fundus light-enhancing illumination system and a fundus detection system are added to achieve real-time monitoring of the eye condition, further realizing the function of intelligent adjustment and high-performance fundus imaging effect.

[0074] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A free-form surface reflective eyepiece optical system, characterized in that: It comprises an imaging system, an illumination system and a detection system; the imaging system and the illumination system are arranged in sequence along the direction of the optical axis away from the human eye, and the detection system is located between the human eye and the imaging system; or the imaging system and the detection system are arranged in sequence along the direction of the optical axis away from the human eye, and the illumination system is located between the human eye and the imaging system; The imaging system comprises a micro display, a first lens and a second lens arranged in sequence from a human eye along an optical axis away from the human eye, and a first optical lens group located on the optical axis of the micro display and between the first lens and the second lens; The second lens is a free-form semi-transparent and semi-reflective lens; the center distance between the free-form optical surface of the second lens close to the human eye and the human eye is fd, the optical effective diameter range of the free-form optical surface of the second lens is D, and fd and D satisfy the following relationship (1): 0.71≤fd / D≤1.9 (1); The first lens is a plane semi-transparent and semi-reflective lens; the angle between the first lens and the optical axis at the human eye is ξ, and the size of ξ satisfies the following relationship (2): 55°<ξ<170° (2); The micro display is located between the second lens and the human eye; the angle between the optical axis of the micro display and the optical axis of the human eye is λ, and the magnitude of the angle λ satisfies the following relation (4): 25°≤λ≤55° (4); The detection system comprises a COMS receiver and a second optical lens group; the second optical lens group is located on the optical axis of the COMS receiver; The lighting system comprises a lighting source; Wherein, the angle between the optical axis of the COMS receiver and the optical axis at the human eye is θ; or the angle between the optical axis of the illumination light source and the optical axis at the human eye is θ; The size of the angle θ satisfies the following relation (6): 10°<θ<50° (6).

2. The eyepiece optical system according to claim 1, characterized in that: The angle between the central axis of the second lens and the optical axis of the human eye is β, and the value of β satisfies the following relationship (3): -20°<β<30° (3)。 3. The eyepiece optical system according to claim 1, characterized in that: The full field of view of the optical system is 2ω, and 2ω satisfies the following relationship (5): 2ω≥20° (5).

4. The eyepiece optical system according to claim 1, characterized in that: The illumination light source is a light source in any range of ultraviolet light band, visible light band and infrared light band.

5. The eyepiece optical system according to claim 1, characterized in that: The COMS receiver is an imaging optical device or a light energy detection optical device.

6. The eyepiece optical system according to claim 1, characterized in that: The detection system and the illumination system are symmetrically arranged along a central axis formed by an angle between the optical axis of the COMS receiver and the optical axis of the illumination light source.

7. A free-form surface reflective eyepiece optical device, characterized in that: Comprising an eyepiece optical system as described in any one of claims 1-6.

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