AR detection optical system with astigmatism diopter compensation and use method

Abstract

The invention discloses an AR detection optical system with astigmatism diopter compensation and a use method thereof. The detection optical system comprises an aperture, a front lens group, a field lens group, a front relay lens group, an astigmatism diopter compensation group, and a rear relay lens group, which are arranged in sequence from an object side to an image side. The astigmatism diopter compensation group consists of two cylindrical mirrors whose busbars are parallel. Along the optical path direction from the object side to the image side, the two cylindrical mirrors are a first cylindrical mirror and a second cylindrical mirror in sequence; the front surface of the first cylindrical mirror is convex toward the object side, and the rear surface is a plane; the front surface of the second cylindrical mirror is a plane, and the rear surface is a concave surface facing the image side; the invention can cover an astigmatism diopter compensation range of 0D to 4D, and for each individual channel, the busbar of the cylindrical mirror can be controlled by a motor to rotate at 0° to 180°, thereby realizing the detection of the astigmatism diopter axial direction; the user experience is improved and the invention is suitable for people with diopter errors.

Description

Technical Field

[0001] The present invention relates to the technical field of virtual display device performance detection, and in particular to an AR detection optical system with astigmatism diopter compensation and a use method thereof. Background Art

[0002] In order to improve the user experience and adapt to the use of people with refractive errors, AR / VR virtual display equipment manufacturers generally have their own solutions for myopia and hyperopia. Some have built-in refractive adjustment, while others can customize lenses. For the performance testing of virtual display devices such as AR / VR equipped with spherical refractive power, especially astigmatism refractive prescription lenses Rx, conventional conoscope lenses (human-like eye lenses) can generally only cover the detection range of spherical optical focal length, and there is no way to detect the optical performance of astigmatism refractive power. Summary of the invention

[0003] Technical purpose: In view of the deficiencies in the performance detection of the above-mentioned existing virtual display devices, the present invention discloses an AR detection optical system with astigmatism diopter compensation and a method of use.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] An AR detection optical system with astigmatism diopter compensation comprises an aperture, a front lens group, a field lens group, a relay lens front group, an astigmatism diopter compensation group, and a relay lens rear group, which are arranged in sequence from an object side to an image side. The astigmatism diopter compensation group consists of two cylindrical mirrors with parallel generatrixes. Along the optical path direction from the object side to the image side, the two cylindrical mirrors are a first cylindrical mirror and a second cylindrical mirror in sequence; the front surface of the first cylindrical mirror is convex toward the object side, and the rear surface is a plane; the front surface of the second cylindrical mirror is a plane, and the rear surface is a concave surface facing the image side.

[0006] Preferably, the front lens group of the present invention comprises a first positive lens, a second positive lens, a third positive lens and a first negative lens, and the third positive lens and the first negative lens are cemented together to form a cemented lens for correcting chromatic aberration.

[0007] Preferably, the front surface of the first positive lens of the present invention is curved toward the object side, and the rear surface is convex toward the image side; the concave surface of the second positive lens faces the object side, and the convex surface faces the image side; the front and rear surfaces of the third positive lens are both convex; the concave surface of the first negative lens faces the object side, and the convex surface faces the image side.

[0008] Preferably, the focal length of the front lens group of the present invention is 0 <f01<12mm。

[0009] Preferably, the field lens assembly of the present invention includes a fourth positive lens and a second negative lens glued together to correct the field curvature and astigmatism of the detection optical system, the front and rear surfaces of the fourth positive lens are both convex, and the concave surface of the second negative lens faces the object side, and the convex surface faces the image side.

[0010] Preferably, the front group of the relay mirror of the present invention includes a fifth positive lens, a sixth positive lens, and a seventh positive lens and a third negative lens glued to each other, wherein the front surface of the fifth positive lens is curved toward the object side, and the rear surface is convex toward the image side; the front surface of the sixth positive lens is convex toward the object side, and the rear surface is concave toward the image side; the front and rear surfaces of the seventh positive lens are both convex; and the front and rear surfaces of the third negative lens are both concave.

[0011] Preferably, the rear group of the relay mirror of the present invention includes a fourth negative lens with concave front and rear surfaces, an eighth positive lens with convex front and rear surfaces, and a ninth positive lens and a tenth positive lens that are biconvex, and the fourth negative lens and the eighth positive lens are glued to each other.

[0012] Preferably, the number of astigmatism diopter compensation groups of the present invention is several groups, which are concentrically arranged on the mounting hole of the rotating wheel, and the astigmatism diopter compensation groups are rotatably connected to the mounting hole of the rotating wheel and can rotate independently relative to the rotating wheel. The rotating wheel and the astigmatism diopter compensation groups are both connected to a rotational power source, and the astigmatism diopter compensation groups corresponding to the optical path of the detection system are switched by rotating the rotating wheel.

[0013] The present invention also provides a method for using the AR detection optical system with astigmatism refractive power compensation, wherein the object to be tested is placed on the object side and corresponds to the optical path of the detection optical system, and the object to be tested is imaged on the image side; for the object to be tested without astigmatism, the radius of curvature of the astigmatism refractive power compensation group approaches an infinite plane, so that the detection optical path system can detect the object to be tested without astigmatism; for the object to be tested with astigmatism refractive power, the astigmatism refractive power is compensated by two cylindrical mirrors of the astigmatism refractive power compensation group; and by switching different astigmatism refractive power compensation groups, different refractive power compensation ranges are covered.

[0014] Preferably, in the present invention, when switching the astigmatism diopter compensation group, the astigmatism diopter compensation groups with different compensation parameters are concentrically arranged on a rotating wheel, and the astigmatism diopter compensation groups are switched by rotating the rotating wheel; and each astigmatism diopter compensation group is individually rotatably arranged, and the axial matching of the cylindrical mirror busbar and the astigmatism is performed by rotating the astigmatism diopter compensation group.

[0015] Beneficial effects: The AR detection optical system with astigmatism diopter compensation and the use method provided by the present invention have the following beneficial effects:

[0016] 1. The present invention compensates for the astigmatism of the object to be tested by two cylindrical mirrors whose generatrixes are parallel to each other. For the object to be tested without astigmatism, the curvature radii of the two cylindrical mirrors approach an infinite plane, thereby taking into account the detection of the object to be tested with and without astigmatism.

[0017] 2. The front lens group of the present invention can correct chromatic aberration. At the same time, by controlling the focal length of the front lens group, the outer diameter of the front lens can be controlled, thereby avoiding interference between the front end of the detection optical system and the temples of the AR / VR glasses to be tested.

[0018] 3. For the object to be tested with spherical astigmatism, the entire optical detection system realizes compensation of spherical optical power by means of forward and backward translation of the image plane; the image plane can be driven by a motor to realize compensation of spherical diopter in a wide range of +4D~-6D.

[0019] 4. The present invention arranges astigmatism diopter compensation groups with different parameters on a rotating wheel, and utilizes the rotation of the rotating wheel to make the astigmatism diopter compensation cover the range of 0D~-4D.

[0020] 5. The astigmatism diopter compensation group of the present invention is rotatably connected to the mounting hole of the rotating wheel and can be driven to rotate independently to control the cylindrical mirror generatrix to rotate between 0° and 180°, thereby achieving matching of the astigmatism axis.

[0021] 6. The present invention can be configured with an XYZ filter and a neutral attenuation filter that conform to the CIE1931 spectrum corresponding curve. The detection optical path of the present invention can be developed into an imaging colorimeter, which can detect the performance indicators such as brightness, chromaticity, uniformity, contrast and optical transfer function of the AR / VR module or the whole machine to be tested. Broaden the application scope of the detection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the lens structure of the optical system of the present invention;

[0024] Figure 2 The structure diagram of the astigmatism diopter compensation group of the present invention;

[0025] Figure 3 is the optical transfer function curve of the present invention when the spherical diopter is 0D and the astigmatism diopter is 0D;

[0026] Figure 4 The optical transfer function curve of the present invention is when the spherical diopter is 0D and the astigmatism diopter is -4D;

[0027] Figure 5 The optical transfer function curve of the present invention when the spherical diopter is +4D and the astigmatism diopter is 0D;

[0028] Figure 6 The optical transfer function curve of the present invention when the spherical diopter is +4D and the astigmatism diopter is -4D;

[0029] Figure 7 The optical transfer function curve of the present invention is when the spherical diopter is -6D and the astigmatism diopter is 0D;

[0030] Figure 8 The optical transfer function curve of the present invention is when the spherical diopter is -6D and the astigmatism diopter is -4D;

[0031] Fig. 9 The field curvature and distortion curve of the basic optical path of the present invention are

[0032] Fig.10 The vertical axis chromatic aberration diagram of the basic optical path of the present invention;

[0033] Fig.11 It is an uncorrected curve diagram of astigmatism of the existing detection optical system;

[0034] Among them, G1-front lens group, G2-field lens group, G3-relay lens front group, G4-astigmatism refractive power compensation group, G5-relay lens rear group, L1-first positive lens, L2-second positive lens, L3-third positive lens, L4-first negative lens, L5-fourth positive lens, L6-second negative lens, L7-fifth positive lens, L8-sixth positive lens, L9-seventh positive lens, L10-third negative lens, L11-first cylindrical lens, L12-second cylindrical lens, L13-fourth negative lens, L14-eighth positive lens, L15-ninth positive lens, L16-tenth positive lens. DETAILED DESCRIPTION

[0035] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by explaining the apparatus, composition and materials of the present disclosure, rather than limiting. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations can be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure. For example, a feature shown or described as a part of an embodiment can be used in conjunction with another embodiment to produce yet another embodiment. It is expected that the present disclosure covers such modifications and variations within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present disclosure are disclosed in or clear from the following detailed description. It will be understood by those of ordinary skill in the art that this discussion is only a description of exemplary embodiments and is not intended to limit the wider aspects of the present disclosure.

[0036] like Figure 1 and Figure 2As shown in the figure, the present invention discloses an AR detection optical system with astigmatic diopter compensation, which includes a diaphragm, a front lens group G1, a field lens group G2, a front relay lens group G3, an astigmatic diopter compensation group G4, and a rear relay lens group G5 arranged in sequence from the object side to the image side. The astigmatic diopter compensation group G4 is composed of two cylindrical lenses with parallel generatrices. Along the optical path direction from the object side to the image side, the two cylindrical lenses are the first cylindrical lens L11 and the second cylindrical lens L12 in sequence; the front surface of the first cylindrical lens L11 bulges towards the object side, and the rear surface is a plane; the front surface of the second cylindrical lens L12 is a plane, and the rear surface is concave towards the image side. For the object to be measured without astigmatism, the radius of curvature of the two cylindrical lenses approaches an infinite plane, so as to take into account the objects to be measured with and without astigmatic diopter.

[0037] The front lens group G1 of the present invention includes a first positive lens L1, a second positive lens L2, a third positive lens L3, and a first negative lens L4. The third positive lens L3 and the first negative lens L4 are mutually cemented to form a cemented lens for correcting chromatic aberration; the front surface of the first positive lens L1 is curved towards the object side, and the rear surface bulges towards the image side for correcting the field curvature of the front group; the concave surface of the second positive lens L2 faces the object side, and the convex surface faces the image side; the front and rear surfaces of the third positive lens L3 are both convex; the concave surface of the first negative lens L4 faces the object side, and the convex surface faces the image side; at the same time, in order to avoid interference with the temple of the AR / VR glasses to be measured during detection, the focal length 0 < f01 < 12 mm of the front lens group G1 of the present invention controls the diameter of the front-end lens of the detection optical system within a range less than 20 mm.

[0038] The field lens group G2 of the present invention includes a fourth positive lens L5 and a second negative lens L6 that are mutually cemented to correct the field curvature and astigmatism of the detection optical system. The front and rear surfaces of the fourth positive lens L5 are both convex. The concave surface of the second negative lens L6 faces the object side, and the convex surface faces the image side. The fourth positive lens L5 and the second negative lens L6 are cemented together as a field lens to connect the front lens group G1 and the subsequent front relay lens group G3 for correcting the field curvature and astigmatism of the system.

[0039] The front relay lens group G3 of the present invention includes a fifth positive lens L7, a sixth positive lens L8, and a seventh positive lens L9 and a third negative lens L10 that are mutually cemented. The front surface of the fifth positive lens L7 is curved towards the object side, and the rear surface bulges towards the image side; the front surface of the sixth positive lens L8 bulges towards the object side, and the rear surface is concave towards the image side; the front and rear surfaces of the seventh positive lens L9 are both convex; the front and rear surfaces of the third negative lens L10 are both concave.

[0040] The rear relay lens group G5 of the present invention includes a fourth negative lens L13 with both front and rear surfaces concave, an eighth positive lens L14 with both front and rear surfaces convex, and a ninth positive lens L15 and a tenth positive lens L16 that are biconvex. The fourth negative lens L13 and the eighth positive lens L14 are mutually cemented.

[0041] For the object to be tested with astigmatism, the entire optical detection system is compensated by the astigmatism diopter compensation group G4. The astigmatism diopter compensation groups G4 of the present invention are divided into several groups, which are particularly subdivided according to the interval of -1D diopter, and are concentrically arranged on the mounting hole of the rotating wheel. The astigmatism diopter compensation group G4 is rotatably connected with the mounting hole of the rotating wheel, and can be rotated independently relative to the rotating wheel. The rotating wheel and the astigmatism diopter compensation group G4 are both connected to a rotation power source. By rotating the rotating wheel, the astigmatism diopter compensation group G4 corresponding to the optical path of the detection system is rotated. The astigmatism diopter compensation group G4 is switched; the astigmatism diopter compensation covers the range of 0D~-4D by means of the rotation of the rotating wheel, and the astigmatism diopter compensation group G4 can be rotated independently by motor control, thereby controlling the cylindrical mirror generatrix to rotate at 0°~180°, thereby achieving the matching of the astigmatism axis; and for the object to be tested with spherical astigmatism, the detection optical system of the present invention realizes the compensation of spherical optical focal length by means of the forward and backward translation of the image plane, thereby achieving the compensation of spherical diopter in a larger range of +4D~-6D.

[0042] In the embodiment of the present invention, the optical parameters of the microscope objective lens under the basic optical path are shown in Table 1:

[0043] Table 1: Optical lens parameter table

[0044]

[0045] The basic optical path is when the object to be measured does not contain spherical refractive power and astigmatic refractive power, the cylindrical lens parameters of the astigmatic refractive power compensation group G4 are the parameters when the object to be measured does not contain spherical refractive power and astigmatic refractive power, and the curvature of the cylindrical lens tends to infinity (that is, a plane); wherein the surface serial number is numbered in sequence from the object side to the image side, and the front and rear surfaces of the lens are numbered in sequence, and for lenses that are glued to each other, only the unglued surfaces are numbered.

[0046] like Fig. 9 and Fig.10 As shown, the field curvature of the basic optical path of the present invention is less than 0.6mm, and the distortion is greater than 15%. At the same time, the vertical axis chromatic aberration of the basic optical path is basically controlled within the Airy disk, meeting the detection requirements.

[0047] At the same time, the astigmatism diopter compensation requirements within the range of 0D to -4D are not met. The present invention also provides the cylindrical lens parameters of the astigmatism diopter compensation group G4 corresponding to each astigmatism diopter compensation condition, as shown in Table 2:

[0048] Table 2: Parameters of cylindrical lens set for 0D~-4D astigmatism compensation

[0049]

[0050] Corresponding to the case where the astigmatism diopter is 0D, the present invention provides a specific cylindrical lens parameter implementation example, which can ensure that the curvature of the cylindrical lens tends to infinity.

[0051] The present invention also provides a method for using the AR detection optical system with astigmatism refractive power compensation, wherein the object to be tested is placed on the object side and corresponds to the optical path of the detection optical system, and the object to be tested is imaged on the image side; for the object to be tested without astigmatism, the radius of curvature of the astigmatism refractive power compensation group G4 approaches an infinite plane, so that the detection optical path system can detect the object to be tested without astigmatism; for the object to be tested with astigmatism refractive power, the astigmatism refractive power is compensated by the two cylindrical lenses of the astigmatism refractive power compensation group G4; and by switching different astigmatism refractive power compensation groups G4, different refractive power compensation ranges are covered.

[0052] When the astigmatism diopter compensation group G4 is switched, the astigmatism diopter compensation group G4 with different compensation parameters is concentrically arranged on a rotating wheel, and the astigmatism diopter compensation group G4 is switched by rotating the rotating wheel; each astigmatism diopter compensation group G4 is individually rotated, and the cylindrical mirror busbar is controlled to rotate between 0° and 180° by rotating the astigmatism diopter compensation group G4, so as to perform axial matching between the cylindrical mirror busbar and the astigmatism; for an object to be tested with spherical astigmatism, the entire optical detection system realizes compensation of spherical optical focal length by means of forward and backward translation of an image plane; and the image plane is driven by a motor to realize compensation of spherical diopter in a large range of +4D to -6D.

[0053] like Figure 3-Figure 8 As shown, the present invention provides optical transfer function curves of detection using the detection optical system of the present application under 5 different conditions; Figure 3 The mesosphere diopter is 0D, and the astigmatism diopter is 0D; Figure 4 The spherical diopter is 0D and the astigmatism diopter is -4D; Figure 5 The spherical diopter is 4D and the astigmatism diopter is 0D; Figure 6 The spherical diopter is 4D and the astigmatism diopter is -4D; Figure 7 In the sphere, the diopter is -6D and the astigmatism is 0D; Figure 8 The spherical diopter is -6D and the astigmatism diopter is -4D. The optical transfer function MTF is > 0.55 at a resolution of 25 line pairs / mm (10 line pairs / degree), which meets the detection requirements. Fig.11 The optical transfer function curve diagram of the conventional detection optical system for the uncorrected object under test with astigmatism diopter is shown. The present invention sets different astigmatism diopter compensation groups G4, so that compensation and correction can be performed in different situations to ensure the detection effect.

[0054] The detection optical system of the present invention can cover a field of view angle greater than 87 degrees, which basically meets the field of view angle detection range of current mainstream AR glasses. During detection, astigmatism diopter compensation is performed as needed. At the same time, by configuring XYZ filters and neutral attenuation filters that conform to the CIE1931 spectral corresponding curve, the detection optical system of the present invention can be developed into an imaging colorimeter, which can realize the detection of performance indicators such as brightness, chromaticity, uniformity, contrast and optical transfer function of the AR / VR module or the whole machine to be tested.

Claims

1. An AR detection optical system with astigmatism diopter compensation, characterized in that: The optical system comprises an aperture, a front lens group (G1), a field lens group (G2), a front relay lens group (G3), an astigmatism diopter compensation group (G4), and a rear relay lens group (G5), which are arranged in sequence from the object side to the image side. The astigmatism diopter compensation group (G4) is composed of two cylindrical lenses with parallel generatrixes. Along the optical path from the object side to the image side, the two cylindrical lenses are a first cylindrical lens (L11) and a second cylindrical lens (L12). The front surface of the first cylindrical lens (L11) is convex toward the object side, and the rear surface is a plane. The front surface of the second cylindrical lens (L12) is a plane, and the rear surface is a concave surface facing the image side. The astigmatism diopter compensation groups (G4) are in a plurality of groups, which are concentrically arranged on the mounting hole of the rotating wheel, and the astigmatism diopter compensation groups (G4) are rotatably connected to the mounting hole of the rotating wheel and can rotate independently relative to the rotating wheel. The rotating wheel and the astigmatism diopter compensation groups (G4) are both connected to a rotational power source, and the astigmatism diopter compensation groups (G4) corresponding to the optical path of the detection system are switched by rotating the rotating wheel.

2. The AR detection optical system with astigmatism diopter compensation according to claim 1, characterized in that: The front lens group (G1) comprises a first positive lens (L1), a second positive lens (L2), a third positive lens (L3) and a first negative lens (L4); the third positive lens (L3) and the first negative lens (L4) are glued together to form a glued lens for correcting chromatic aberration.

3. The AR detection optical system with astigmatism diopter compensation according to claim 2, characterized in that: The front surface of the first positive lens (L1) is curved toward the object side, and the rear surface is convex toward the image side; the concave surface of the second positive lens (L2) faces the object side, and the convex surface faces the image side; the front and rear surfaces of the third positive lens (L3) are both convex; the concave surface of the first negative lens (L4) faces the object side, and the convex surface faces the image side.

4. The AR detection optical system with astigmatism diopter compensation according to claim 2, characterized in that: The focal length of the front lens group (G1) is 0 <f01<12mm。 5. The AR detection optical system with astigmatism diopter compensation according to claim 1, characterized in that: The field lens group (G2) comprises a fourth positive lens (L5) and a second negative lens (L6) which are glued together and used to correct the field curvature and astigmatism of the detection optical system. The front and rear surfaces of the fourth positive lens (L5) are both convex surfaces, and the concave surface of the second negative lens (L6) faces the object side, and the convex surface faces the image side.

6. The AR detection optical system with astigmatism diopter compensation according to claim 1, characterized in that: The relay lens front group (G3) comprises a fifth positive lens (L7), a sixth positive lens (L8), and a seventh positive lens (L9) and a third negative lens (L10) that are glued together. The front surface of the fifth positive lens (L7) is curved toward the object side, and the rear surface is convex toward the image side; the front surface of the sixth positive lens (L8) is convex toward the object side, and the rear surface is concave toward the image side; the front and rear surfaces of the seventh positive lens (L9) are both convex; and the front and rear surfaces of the third negative lens (L10) are both concave.

7. The AR detection optical system with astigmatism diopter compensation according to claim 1, characterized in that: The relay mirror rear group (G5) comprises a fourth negative lens (L13) whose front and rear surfaces are both concave, an eighth positive lens (L14) whose front and rear surfaces are both convex, and a ninth positive lens (L15) and a tenth positive lens (L16) which are biconvex. The fourth negative lens (L13) and the eighth positive lens (L14) are glued together.

8. A method for using an AR detection optical system with astigmatism diopter compensation according to any one of claims 1 to 7, characterized in that: The object to be tested is placed on the object side and corresponds to the optical path of the detection optical system, and the object to be tested is imaged on the image side; for the object to be tested without astigmatism, the radius of curvature of the astigmatism refractive power compensation group (G4) approaches an infinite plane, so that the detection optical path system can detect the object to be tested without astigmatism; for the object to be tested with astigmatism, the astigmatism refractive power is compensated by the two cylindrical lenses of the astigmatism refractive power compensation group (G4); and by switching different astigmatism refractive power compensation groups (G4), different refractive power compensation ranges are covered.

9. The method for using the AR detection optical system with astigmatism diopter compensation according to claim 8, characterized in that: When the astigmatism diopter compensation group (G4) is switched, the astigmatism diopter compensation groups (G4) with different compensation parameters are concentrically arranged on a rotating wheel, and the astigmatism diopter compensation groups (G4) are switched by rotating the rotating wheel; and each astigmatism diopter compensation group (G4) is individually rotated and arranged, and the axial matching of the cylindrical mirror generatrix and the astigmatism is performed by rotating the astigmatism diopter compensation group (G4).

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