Large-view-field high-resolution near-to-eye detection lens

Abstract

The invention discloses a large-field-of-view high-resolution near-to-eye detection lens, which comprises a diaphragm, a first lens group, a second lens group and a third lens group which are sequentially arranged along the direction of an optical axis, the second lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged along the optical axis direction; the third lens group comprises an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens and a sixteenth lens which are sequentially arranged in the optical axis direction; the first lens, the third lens, the seventh lens, the eighth lens, the twelfth lens and the thirteenth lens have negative focal power. The second, fourth, fifth, positive, ninth, tenth, eleventh, fourteenth, fifteenth and sixteenth lenses have positive focal power. The lens has a larger field angle, smaller distortion and higher resolution, can improve the efficiency and accuracy of index detection work of a near-to-eye display product, shortens the physical length, supplements the types of near-to-eye detection lenses, and enables the application range of the near-to-eye detection lenses to be wider.

Description

Technical Field

[0001] This invention relates to a large field-of-view, high-resolution near-eye detection lens, belonging to the field of optical lens technology. Background Technology

[0002] In recent years, augmented reality (AR) / virtual reality (VR) products have been developing rapidly, driving increased demand for near-eye detection lenses. Near-eye detection lenses are key optical components in the R&D and production of AR / VR devices, their core function being to simulate the human eye's precise testing of the optical performance of near-eye displays. Near-eye detection lenses are used on AR / VR device industrial production lines to test display quality, establishing imaging quality evaluation standards for displays under close-range viewing conditions, ensuring user experience. Currently, near-eye detection lenses suffer from problems such as a small field of view, significant distortion, and insufficient resolution. Further R&D capabilities are needed. Based on this, this invention provides a large field of view, high-resolution near-eye detection lens. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a large field-of-view, high-resolution near-eye detection lens, which has a large field of view, low distortion, and high resolution. This improves the efficiency and accuracy of near-eye display product indicator testing, while also shortening the physical length to supplement the variety of near-eye detection lenses, thus enriching their types and expanding their application range.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A wide field-of-view, high-resolution near-eye detection lens includes an aperture stop, a first lens group, a second lens group, and a third lens group arranged sequentially along the optical axis. The first lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis. The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis. The third lens group includes the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens, and the sixteenth lens arranged sequentially along the optical axis. The first lens has negative optical power, with the object-side surface being concave near the optical axis and the image-side surface being convex near the optical axis; The second lens has positive optical power, with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side; The third lens has negative optical power, with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side; The fourth lens has positive optical power, with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side. The fifth lens has positive optical power, with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side. The sixth lens has positive optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side. The seventh lens has negative optical power, and its object-side surface is concave near the optical axis, while its image-side surface is also concave near the optical axis. The eighth lens has negative optical power, and its object-side surface is concave near the optical axis, as is its image-side surface. The ninth lens has positive optical power, and its object-side surface is convex near the optical axis, as is its image-side surface. The tenth lens has positive optical power, and its object-side surface is convex near the optical axis, while its image-side surface is also convex near the optical axis. The eleventh lens has positive optical power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The twelfth lens has negative optical power, and its object-side surface is concave near the optical axis, while its image-side surface is also concave near the optical axis. The thirteenth lens has negative optical power, and its object-side surface is concave near the optical axis, as is its image-side surface. The fourteenth lens has positive optical power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The fifteenth lens has positive optical power, with a concave surface near the optical axis on the object side and a convex surface near the optical axis on the image side; The sixteenth lens has positive optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side.

[0005] The aforementioned aperture is used to transmit light; the first lens group is used to receive and transmit light from the aperture; the second lens group is used to receive and transmit light from the first lens group; and the third lens group is used to receive and transmit light from the second lens group.

[0006] A reflector is placed between the first lens group and the second lens group for deflection.

[0007] The first lens group described above adopts a conical shape system. That is, the outer diameter of each lens in the first lens group is smaller than the outer diameter of each lens in the second lens group; the outer diameter increases sequentially from the first lens to the fourth lens.

[0008] The eighth and ninth lenses mentioned above form a cemented doublet, and the thirteenth and fourteenth lenses form a cemented doublet.

[0009] The first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth lenses mentioned above are all made of glass; the refractive index of the glass is between 1.5 and 1.95, and the Abbe number is between 17.9 and 81.6.

[0010] The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens, fourteenth lens, fifteenth lens, and sixteenth lens mentioned above are all spherical lenses.

[0011] The above method uses a front-positioned aperture to simulate the human eye pupil, and an entrance pupil size of 2-5mm can meet imaging requirements.

[0012] The radius of curvature of the object-side surface of the first lens is -7.309±0.003mm, and the radius of curvature of the image-side surface of the first lens is -9.410±0.003mm; the radius of curvature of the object-side surface of the second lens is -42.246±0.003mm, and the radius of curvature of the image-side surface of the second lens is -8.362±0.003mm; the radius of curvature of the object-side surface of the third lens is -8.379±0.003mm, and the radius of curvature of the image-side surface of the third lens is -14.553±0.003mm; the radius of curvature of the object-side surface of the fourth lens is -51.681±0.003mm, and the radius of curvature of the image-side surface of the fourth lens is -27.236±0.003mm; the fifth lens... The radius of curvature of the object-side surface of the fifth lens is 88.843±0.003mm; the radius of curvature of the image-side surface of the sixth lens is 35.524±0.003mm; the radius of curvature of the object-side surface of the sixth lens is -24.966±0.003mm; the radius of curvature of the image-side surface of the sixth lens is -58.640±0.003mm; the radius of curvature of the object-side surface of the seventh lens is 151.548±0.003mm; the radius of curvature of the image-side surface of the seventh lens is -21.450±0.003mm; the radius of curvature of the object-side surface of the eighth lens is 27.524±0.003mm; the radius of curvature of the image-side surface of the eighth lens is -44.833±0.003mm; the radius of curvature of the object-side surface of the ninth lens is... The radius of curvature of the surface of the tenth lens is -44.833±0.003mm; the radius of curvature of the image-side surface of the ninth lens is 37.390±0.003mm; the radius of curvature of the object-side surface of the tenth lens is -103.803±0.003mm; the radius of curvature of the image-side surface of the eleventh lens is -28.752±0.003mm; the radius of curvature of the image-side surface of the eleventh lens is 332.040±0.003mm; the radius of curvature of the object-side surface of the twelfth lens is 95.551±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -15.291±0.003mm; the radius of curvature of the object-side surface of the thirteenth lens is -44.83 ...03.803±0.003mm; the radius of curvature of the image-side surface of the twelfth lens is -15.291±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -15.291±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -44.833±0.003mm; the radius of curvature of the image-side surface of the thirteenth The radius of curvature of the side surface of the thirteenth lens is 30.331±0.003mm; the radius of curvature of the image side surface of the fourteenth lens is -11.878±0.003mm; the radius of curvature of the object side surface of the fourteenth lens is -11.878±0.003mm; the radius of curvature of the image side surface of the fourteenth lens is 31.860±0.003mm; the radius of curvature of the object side surface of the fifteenth lens is 148.185±0.003mm; the radius of curvature of the image side surface of the fifteenth lens is 35.193±0.003mm; the radius of curvature of the object side surface of the sixteenth lens is -50.153±0.003mm; and the radius of curvature of the image side surface of the sixteenth lens is -1105.591±0.003mm.

[0013] The center thickness of the first lens is 3.914 ±0.003 mm; the center thickness of the second lens is 5.618 ±0.003 mm; the center thickness of the third lens is 2.020 ±0.003 mm; the center thickness of the fourth lens is 3.050 ±0.003 mm; the center thickness of the fifth lens is 5.592 ±0.003 mm; the center thickness of the sixth lens is 9.289 ±0.003 mm; the center thickness of the seventh lens is 2.980 ±0.003 mm; the center thickness of the eighth lens is 11.255 ±0.003 mm; and the center thickness of the ninth lens is 17.733 ±0.003 mm. The center thickness of the tenth lens is 20.013±0.003mm; the center thickness of the eleventh lens is 10.544±0.003mm; the center thickness of the twelfth lens is 4.203±0.003mm; the center thickness of the thirteenth lens is 3.010±0.003mm; the center thickness of the fourteenth lens is 9.184±0.003mm; the center thickness of the fifteenth lens is 17.645±0.003mm; and the center thickness of the sixteenth lens is 5.562±0.003mm.

[0014] The center-to-center spacing between the first and second lenses is 0.220±0.003mm; between the second and third lenses is 0.193±0.003mm; between the third and fourth lenses is 0.200±0.003mm; between the fifth and sixth lenses is 0.520±0.003mm; between the sixth and seventh lenses is 3.234±0.003mm; between the seventh and eighth lenses is 9.014±0.003mm; and the ninth lens... The center spacing between the tenth lens and the eleventh lens is 19.079±0.003mm; the center spacing between the tenth and eleventh lenses is 1.344±0.003mm; the center spacing between the eleventh and twelfth lenses is 3.499±0.003mm; the center spacing between the twelfth and thirteenth lenses is 4.527±0.003mm; the center spacing between the fourteenth and fifteenth lenses is 14.149±0.003mm; and the center spacing between the fifteenth and sixteenth lenses is 2.112±0.003mm.

[0015] The above center thickness refers to the absolute value of the corresponding thickness; the center spacing is the absolute value of the corresponding spacing.

[0016] Any techniques not mentioned in this invention are based on existing technologies.

[0017] Compared with existing technologies, the beneficial effects of this invention are as follows: The large field-of-view, high-resolution near-eye detection lens provided by this invention, by simulating the structure of the human eye and adopting a front-positioned aperture and other structures, and by rationally setting the parameters of each lens, can be used to replace manual inspection of AR / VR products. Through the design of double cemented lenses and the cooperation of multiple lenses, chromatic aberration is eliminated, distortion is reduced, and the field of view is increased, thereby improving detection efficiency, accuracy, and resolution, and maintaining stable quality. The physical length is shortened by the reflector between the first and second lens groups, which supplements the types of near-eye detection lenses, making the types of near-eye detection lenses more abundant and the application range more extensive. Attached Figure Description

[0018] Figure 1 This is an optical structure diagram of a large field-of-view, high-resolution near-eye detection lens provided by the present invention.

[0019] Figure 2 This invention provides an optical structure diagram of the aperture and the first lens group of a large field-of-view, high-resolution near-eye detection lens.

[0020] Figure 3 This is an optical structure diagram of the second lens group of a large field-of-view, high-resolution near-eye detection lens provided by the present invention.

[0021] Figure 4 This is an optical structure diagram of the third lens group of a large field-of-view, high-resolution near-eye detection lens provided by the present invention.

[0022] Figure 5 The MTF curve of a large field-of-view, high-resolution near-eye detection lens provided by this invention is shown at 83 lp / mm.

[0023] Figure 6 The MTF curve of a large field-of-view, high-resolution near-eye detection lens provided by this invention is 167 lp / mm.

[0024] Figure 7 This invention provides a light spot pattern diagram for a large field-of-view, high-resolution near-eye detection lens.

[0025] Figure 8 The 167lp / mm defocus curve of a large field-of-view, high-resolution near-eye detection lens provided by this invention.

[0026] Figure 9 The field curve diagram of the optical system of a large field-of-view, high-resolution near-eye detection lens provided by the present invention.

[0027] Figure 10 The optical system distortion diagram of a large field-of-view, high-resolution near-eye detection lens provided by the present invention.

[0028] Figure 11The relative illumination curve of a large field-of-view, high-resolution near-eye detection lens provided by the present invention.

[0029] In the diagram: 1-First lens; 2-Second lens; 3-Third lens; 4-Fourth lens; 5-Fifth lens; 6-Sixth lens; 7-Seventh lens; 8-Eighth lens; 9-Ninth lens; 10-Tenth lens; 11-Eleventh lens; 12-Twelfth lens; 13-Thirteenth lens; 14-Fourteenth lens; 15-Fifteenth lens; 16-Sixteenth lens. Detailed Implementation

[0030] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the content of the present invention is not limited to the following embodiments.

[0031] Example 1

[0032] like Figure 1 As shown, a large field-of-view, high-resolution near-eye detection lens includes an aperture stop 17, a first lens group, a second lens group, and a third lens group arranged sequentially along the optical axis. The aperture stop transmits light; the first lens group receives and transmits light from the aperture stop, and is composed of a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 arranged sequentially along the optical axis; the second lens group receives and transmits light from the first lens group, and is composed of a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10 arranged sequentially along the optical axis; the third lens group receives and transmits light from the second lens group, and is composed of an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, and a sixteenth lens 16 arranged sequentially along the optical axis. The first lens 1 has negative optical power, the object-side surface of the first lens 1 is concave near the optical axis, and the image-side surface of the first lens 1 is convex near the optical axis; The second lens 2 has positive optical power. The object-side surface of the second lens 2 is concave near the optical axis, and the image-side surface of the second lens 2 is convex near the optical axis. The third lens 3 has negative optical power. The object-side surface of the third lens 3 is concave near the optical axis, and the image-side surface of the third lens 3 is convex near the optical axis. The fourth lens 4 has positive optical power. The object-side surface of the fourth lens 4 is concave near the optical axis, and the image-side surface of the fourth lens 4 is convex near the optical axis. The fifth lens 5 has positive optical power. The object-side surface of the fifth lens 5 is concave near the optical axis, and the image-side surface of the fifth lens 5 is convex near the optical axis. The sixth lens 6 has positive optical power. The object-side surface of the sixth lens 6 is convex near the optical axis, and the image-side surface of the sixth lens 6 is concave near the optical axis. The seventh lens 7 has negative optical power. The object-side surface of the seventh lens 7 is concave near the optical axis, and the image-side surface of the seventh lens 7 is also concave near the optical axis. The eighth lens 8 has negative optical power. The object-side surface of the eighth lens 8 is concave near the optical axis, and the image-side surface of the eighth lens 8 is also concave near the optical axis. The ninth lens 9 has positive optical power. The object-side surface of the ninth lens 9 is convex near the optical axis, and the image-side surface of the ninth lens 9 is also convex near the optical axis. The tenth lens 10 has positive optical power. The object-side surface of the tenth lens 10 is convex near the optical axis, and the image-side surface of the tenth lens 10 is also convex near the optical axis. The eleventh lens 11 has positive optical power. The object-side surface of the eleventh lens 11 is convex near the optical axis, and the image-side surface of the eleventh lens 11 is convex near the optical axis. The twelfth lens 12 has negative optical power. The object-side surface of the twelfth lens 12 is concave near the optical axis, and the image-side surface of the twelfth lens 12 is concave near the optical axis. The thirteenth lens 13 has negative optical power. The object-side surface of the thirteenth lens 13 is concave near the optical axis, and the image-side surface of the thirteenth lens 13 is also concave near the optical axis. The fourteenth lens 14 has positive optical power. The object-side surface of the fourteenth lens 14 is convex near the optical axis, and the image-side surface of the fourteenth lens 14 is convex near the optical axis. The fifteenth lens 15 has positive optical power. The object-side surface of the fifteenth lens 15 is concave near the optical axis, and the image-side surface of the fifteenth lens 15 is convex near the optical axis. The sixteenth lens 16 has positive optical power. The object-side surface of the sixteenth lens 16 is convex near the optical axis, and the image-side surface of the sixteenth lens 16 is concave near the optical axis.

[0033] The radius of curvature of the object-side surface of the first lens is -7.309 mm, and the radius of curvature of the image-side surface of the first lens is -9.410 mm; the radius of curvature of the object-side surface of the second lens is -42.246 mm, and the radius of curvature of the image-side surface of the second lens is -8.362 mm; the radius of curvature of the object-side surface of the third lens is -8.379 mm, and the radius of curvature of the image-side surface of the third lens is -14.553 mm; the radius of curvature of the object-side surface of the fourth lens is -51.681 mm, and the radius of curvature of the image-side surface of the fourth lens is -27.236 mm; the fifth lens... The radius of curvature of the object-side surface of the fifth lens is 88.843 mm; the radius of curvature of the image-side surface of the sixth lens is 35.524 mm; the radius of curvature of the object-side surface of the sixth lens is -24.966 mm, and the radius of curvature of the image-side surface of the sixth lens is -58.640 mm; the radius of curvature of the object-side surface of the seventh lens is 151.548 mm, and the radius of curvature of the image-side surface of the seventh lens is -21.450 mm; the radius of curvature of the object-side surface of the eighth lens is 27.524 mm, and the radius of curvature of the image-side surface of the eighth lens is -44.833 mm; the radius of curvature of the object-side surface of the ninth lens is... The radius of curvature of the object-side surface of the ninth lens is -44.833 mm, and the radius of curvature of the image-side surface of the tenth lens is 37.390 mm; the radius of curvature of the object-side surface of the tenth lens is -103.803 mm, and the radius of curvature of the image-side surface of the tenth lens is 99.188 mm; the radius of curvature of the object-side surface of the eleventh lens is -28.752 mm, and the radius of curvature of the image-side surface of the eleventh lens is 332.040 mm; the radius of curvature of the object-side surface of the twelfth lens is 95.551 mm, and the radius of curvature of the image-side surface of the twelfth lens is -15.291 mm; the radius of curvature of the object-side surface of the thirteenth lens is... The radius of curvature of the object-side surface of the thirteenth lens is 30.331 mm; the radius of curvature of the image-side surface of the fourteenth lens is -11.878 mm; the radius of curvature of the object-side surface of the fourteenth lens is -11.878 mm, and the radius of curvature of the image-side surface of the fourteenth lens is 31.860 mm; the radius of curvature of the object-side surface of the fifteenth lens is 148.185 mm, and the radius of curvature of the image-side surface of the fifteenth lens is 35.193 mm; the radius of curvature of the object-side surface of the sixteenth lens is -50.153 mm, and the radius of curvature of the image-side surface of the sixteenth lens is -1105.591 mm. By using appropriate radii of curvature, the imaging effect of the system is ensured to meet the requirements.

[0034] The center thickness of the first lens 1 is 3.914 mm; the center thickness of the second lens 2 is 5.618 mm; the center thickness of the third lens 3 is 2.020 mm; the center thickness of the fourth lens 4 is 3.050 mm; the center thickness of the fifth lens 5 is 5.592 mm; the center thickness of the sixth lens 6 is 9.289 mm; the center thickness of the seventh lens 7 is 2.980 mm; the center thickness of the eighth lens 8 is 11.255 mm; the center thickness of the ninth lens 9 is 17.733 mm; the center thickness of the tenth lens 10 is 20.013 mm; the center thickness of the eleventh lens 11 is 10.544 mm; the center thickness of the twelfth lens 12 is 4.203 mm; the center thickness of the thirteenth lens 13 is 3.010 mm; the center thickness of the fourteenth lens 14 is 9.184 mm; the center thickness of the fifteenth lens 15 is 17.645 mm; and the center thickness of the sixteenth lens 16 is 5.562 mm. By using appropriate center thicknesses, the imaging effect of the system is ensured to meet the requirements.

[0035] The center-to-center distance between the first lens 1 and the second lens 2 is 0.220 mm; the center-to-center distance between the second lens 2 and the third lens 3 is 0.193 mm; the center-to-center distance between the third lens 3 and the fourth lens 4 is 0.200 mm; the center-to-center distance between the fifth lens 5 and the sixth lens 6 is 0.520 mm; the center-to-center distance between the sixth lens 6 and the seventh lens 7 is 3.234 mm; the center-to-center distance between the seventh lens 7 and the eighth lens 8 is 9.014 mm; the center-to-center distance between the ninth lens 9 and the tenth lens 10 is 19.079 mm; the center-to-center distance between the tenth lens 10 and the eleventh lens 11 is 1.344 mm; the center-to-center distance between the eleventh lens 11 and the twelfth lens 12 is 3.499 mm; the center-to-center distance between the twelfth lens 12 and the thirteenth lens 13 is 4.527 mm; the center-to-center distance between the fourteenth lens 14 and the fifteenth lens 15 is 14.149 mm; and the center-to-center distance between the fifteenth lens 15 and the sixteenth lens 16 is 2.112 mm. By using an appropriate center spacing, the imaging effect of the system can be ensured to meet the requirements.

[0036] A reflector 18 is provided between the first lens group and the second lens group to rotate 90°, and the reflector 18 is set at 45°.

[0037] The first lens group of this application adopts a conical system, that is, the outer diameter of each lens in the first lens group is smaller than the outer diameter of each lens in the second lens group; the outer diameter of the first lens 1 is smaller than the outer diameter of the second lens 2, the outer diameter of the second lens 2 is smaller than the outer diameter of the third lens 3, and the outer diameter of the third lens 3 is smaller than the outer diameter of the fourth lens 4.

[0038] Lenses 8 (eighth) and 9 (ninth) form a cemented doublet, as do lenses 13 (thirteenth) and 14 (fourteenth). Cemented doublets effectively overcome the chromatic aberration problem of single lenses, improving image sharpness and fidelity. Lenses 1 (first), 2 (second), 3 (third), 4 (fourth), 5 (fifth), 6 (sixth), 7 (seventh), 8 (eighth), 9 (ninth), 10 (tenth), 11 (eleventh), 12 (twelfth), 13 (thirteenth), 14 (fourteenth), 15 (fifteenth), and 16 (sixteenth) are all made of glass. The refractive index of the glass is between 1.5 and 1.95, and the Abbe number is between 17.9 and 81.6. By selecting appropriate materials, the optical performance of the system can be guaranteed to meet the requirements.

[0039] Lens 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, and 16 are all spherical lenses. Spherical lenses have relatively mature manufacturing processes, enabling their production with higher efficiency and lower costs.

[0040] Using a 17-degree aperture to simulate the human pupil, the imaging requirements can be met within a 2-5mm pupil size, and it can be used to replace manual observation and test product performance.

[0041] Table 1 Parameters of each lens

[0042] Table 1 shows the parameters of each lens. When reading the radius of curvature data of the lenses in Table 1, the radius of curvature data in the top row refers to the radius of curvature of the object-side surface of the lens, and the radius of curvature data in the bottom row refers to the radius of curvature of the image-side surface of the lens. For example, the radius of curvature data of surface number S1 refers to the radius of curvature of the object-side surface of the first lens 1, the radius of curvature data of surface number S2 refers to the radius of curvature of the image-side surface of the first lens 1, and so on. When reading the center thickness of the lenses in Table 1, the thickness data in the top row refers to the center thickness of the optical axis of the lens. For example, the thickness data of surface number S1 refers to the center thickness of the first lens 1. When reading the center spacing between lenses in Table 1, the thickness data in the bottom row refers to the center spacing between lenses. For example, the thickness data of surface number S2 refers to the center spacing between the first lens 1 and the second lens 2, and so on.

[0043] Note: After passing through the reflector, the direction of the incident light is changed by the reflector, and the positive and negative values ​​of the radius of curvature and thickness of each lens will be reversed.

[0044] Figure 1 The diagram illustrates the optical structure of a large field-of-view, high-resolution near-eye detection lens provided by this invention. Figure 2 The diagram illustrates the optical structure of the aperture and the first lens group of a large field-of-view, high-resolution near-eye detection lens provided by this invention. Figure 3 The diagram shows the optical structure of the second lens group of a large field-of-view, high-resolution near-eye detection lens provided by this invention. Figure 4 The diagram shows the optical structure of the third lens group of a large field-of-view, high-resolution near-eye detection lens provided by this invention. Figures 5-11 The results of this invention are at 20°C.

[0045] The modulation transfer function (MTF) combines resolution and contrast ratio, and is one of the important indicators for measuring the imaging quality of an optical system. The higher the MTF value, and the closer it is to the diffraction limit, the better the imaging quality and the higher the resolution. Figure 5 and Figure 6 All are MTF curves of the present invention, by Figure 5 As can be seen, the horizontal axis (0-83 lp / mm) represents spatial frequency, and the vertical axis (0-1) represents the percentage of image quality. Overall, it is close to the diffraction limit, and the minimum MTF value is above 0.7, indicating that this invention has relatively good resolving power. Figure 6 As can be seen, the horizontal axis of 0-167 lp / mm represents the spatial frequency, and the vertical axis of 0-1 represents the percentage of image quality. The minimum value of MTF is above 0.5, indicating that the image quality of this invention is also relatively good when imaging with higher line pairs.

[0046] The light spot pattern represents the imaging quality of an optical system; the smaller the value, the better the imaging quality. Figure 7 The image shows a pattern of light spots in this invention. As can be seen from the image, the diffuse spot values ​​of this invention are relatively small, and the root mean square (RMS) values ​​are all within 2 μm, indicating that the imaging quality of this invention is relatively good.

[0047] The defocus curve represents the change in MTF when the image plane deviates from the design value. The horizontal axis represents the distance of the image plane deviating forward and backward, and the vertical axis represents the MTF value. Figure 8 The figure shows the defocus curve of the present invention. As can be seen from the figure, the defocus range of the present invention is ±0.05mm. The large defocus range makes it easier to focus the detector.

[0048] Field curvature affects the image sharpness of the system, changing from the center outwards, and field curvature correction is necessary. Figure 9The field curvature diagram of this invention shows that, as can be seen from the diagram, the field curvature of the large field-of-view high-resolution near-eye detection lens in this example is controlled within -0.015-0.08mm within the maximum field of view, indicating that the field curvature correction of the large field-of-view high-resolution near-eye detection lens is good.

[0049] Distortion is used to indicate the degree of image distortion after imaging by an optical system. Figure 10 The distortion diagram of this invention shows that, as can be seen from the diagram, the distortion of the large field-of-view high-resolution near-eye detection lens in this example does not exceed 2.1% within the maximum field of view.

[0050] A relative illuminance curve is a diagram showing the ratio of illuminance at any point to the maximum illuminance in the field of view. The higher the value, the better the relative illuminance. Figure 11 The figure shows the relative illumination curve of the present invention. As can be seen from the figure, the present invention can greatly reduce the grayscale error at the edge and center of the image.

[0051] Based on the above, the advantages of this invention are as follows: The large field-of-view, high-resolution near-eye detection lens provided by this invention simulates the structure of the human eye, adopts a system with a front-positioned aperture and a conical shape, and rationally sets the parameters of each lens. It can be used to replace manual inspection of AR / VR products. Through the design of double cemented lenses and the cooperation of multiple lenses, chromatic aberration is eliminated, distortion is reduced, and the field of view is increased, thereby improving the detection efficiency, accuracy, and resolution, and maintaining stable quality. The physical length is shortened by the reflector between the first and second lens groups, which supplements the types of near-eye detection lenses, making the types of near-eye detection lenses more abundant and the application range more extensive.

Claims

1. A large field-of-view, high-resolution near-eye detection lens, characterized in that: It includes an aperture stop, a first lens group, a second lens group, and a third lens group arranged sequentially along the optical axis; The first lens group consists of a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis. The second lens group consists of a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis. The third lens group consists of the eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth lenses arranged sequentially along the optical axis. The first lens has negative optical power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis; The second lens has positive optical power, and its object-side surface is concave near the optical axis, while its image-side surface is convex near the optical axis. The third lens has negative optical power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis; The fourth lens has positive optical power, and its object-side surface is concave near the optical axis, while its image-side surface is convex near the optical axis. The fifth lens has positive optical power, and its object-side surface is concave near the optical axis, while its image-side surface is convex near the optical axis. The sixth lens has positive optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis; The seventh lens has negative optical power, and its object-side surface is concave near the optical axis, as is its image-side surface. The eighth lens has negative optical power, and its object-side surface is concave near the optical axis, as is its image-side surface. The ninth lens has positive optical power, and its object-side surface is convex near the optical axis, and its image-side surface is also convex near the optical axis. The tenth lens has positive optical power, and its object-side surface is convex near the optical axis, as is its image-side surface. The eleventh lens has positive optical power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The twelfth lens has negative optical power, and its object-side surface is concave near the optical axis, while its image-side surface is also concave near the optical axis. The thirteenth lens has negative optical power, and its object-side surface is concave near the optical axis, while its image-side surface is also concave near the optical axis. The fourteenth lens has positive optical power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The fifteenth lens has positive optical power, and its object-side surface is concave near the optical axis, while its image-side surface is convex near the optical axis. The sixteenth lens has positive optical power, with its object-side surface being convex near the optical axis and its image-side surface being concave near the optical axis.

2. The large field-of-view, high-resolution near-eye detection lens according to claim 1, characterized in that: A reflector is placed between the first lens group and the second lens group to facilitate steering.

3. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The outer diameter of each lens in the first lens group is smaller than the outer diameter of each lens in the second lens group.

4. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The outer diameter of the first lens is smaller than that of the second lens, the outer diameter of the second lens is smaller than that of the third lens, and the outer diameter of the third lens is smaller than that of the fourth lens.

5. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The eighth and ninth lenses form a cemented doublet, and the thirteenth and fourteenth lenses form a cemented doublet.

6. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth lenses are all made of glass; the refractive index of the glass is between 1.5 and 1.95, and the Abbe number is between 17.9 and 81.

6.

7. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: Lenses 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, and 16 are all spherical lenses.

8. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The radius of curvature of the object-side surface of the first lens is -7.309±0.003mm, and the radius of curvature of the image-side surface of the first lens is -9.410±0.003mm; the radius of curvature of the object-side surface of the second lens is -42.246±0.003mm, and the radius of curvature of the image-side surface of the second lens is -8.362±0.003mm; the radius of curvature of the object-side surface of the third lens is -8.379±0.003mm, and the radius of curvature of the image-side surface of the third lens is -14.553±0.003mm; the radius of curvature of the object-side surface of the fourth lens is -51.681±0.003mm, and the radius of curvature of the image-side surface of the fourth lens is -27.236±0.003mm; the fifth lens... The radius of curvature of the object-side surface of the fifth lens is 88.843±0.003mm; the radius of curvature of the image-side surface of the sixth lens is 35.524±0.003mm; the radius of curvature of the object-side surface of the sixth lens is -24.966±0.003mm; the radius of curvature of the image-side surface of the sixth lens is -58.640±0.003mm; the radius of curvature of the object-side surface of the seventh lens is 151.548±0.003mm; the radius of curvature of the image-side surface of the seventh lens is -21.450±0.003mm; the radius of curvature of the object-side surface of the eighth lens is 27.524±0.003mm; the radius of curvature of the image-side surface of the eighth lens is -44.833±0.003mm; the radius of curvature of the object-side surface of the ninth lens is... The radius of curvature of the object-side surface of the tenth lens is -44.833±0.003mm; the radius of curvature of the image-side surface of the tenth lens is 37.390±0.003mm; the radius of curvature of the object-side surface of the eleventh lens is -103.803±0.003mm; the radius of curvature of the image-side surface of the twelfth lens is 99.188±0.003mm; the radius of curvature of the object-side surface of the eleventh lens is -28.752±0.003mm; the radius of curvature of the image-side surface of the eleventh lens is 332.040±0.003mm; the radius of curvature of the object-side surface of the twelfth lens is 95.551±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -15.291±0.003mm; the radius of curvature of the object-side surface of the thirteenth lens is -44.833±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -15.291±0.003mm; the radius of curvature of the object-side surface of the thirteenth lens is -15.291±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -15.291±0.003mm; the radius of curvature of the image-side surface of the thirteenth lens is -103.803±0.003mm; the radius of curvature of the image-side surface of the twelfth lens is -103.803±0.003mm; the radius of curvature of the image-side surface The radius of curvature of the side surface of the thirteenth lens is 30.331±0.003mm; the radius of curvature of the image side surface of the fourteenth lens is -11.878±0.003mm; the radius of curvature of the object side surface of the fourteenth lens is -11.878±0.003mm; the radius of curvature of the image side surface of the fourteenth lens is 31.860±0.003mm; the radius of curvature of the object side surface of the fifteenth lens is 148.185±0.003mm; the radius of curvature of the image side surface of the fifteenth lens is 35.193±0.003mm; the radius of curvature of the object side surface of the sixteenth lens is -50.153±0.003mm; and the radius of curvature of the image side surface of the sixteenth lens is -1105.591±0.003mm.

9. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The center thickness of the first lens is 3.914 ±0.003 mm; the center thickness of the second lens is 5.618 ±0.003 mm; the center thickness of the third lens is 2.020 ±0.003 mm; the center thickness of the fourth lens is 3.050 ±0.003 mm; the center thickness of the fifth lens is 5.592 ±0.003 mm; the center thickness of the sixth lens is 9.289 ±0.003 mm; the center thickness of the seventh lens is 2.980 ±0.003 mm; the center thickness of the eighth lens is 11.255 ±0.003 mm; and the center thickness of the ninth lens is 17.733 ±0.003 mm. The center thickness of the tenth lens is 20.013±0.003mm; the center thickness of the eleventh lens is 10.544±0.003mm; the center thickness of the twelfth lens is 4.203±0.003mm; the center thickness of the thirteenth lens is 3.010±0.003mm; the center thickness of the fourteenth lens is 9.184±0.003mm; the center thickness of the fifteenth lens is 17.645±0.003mm; and the center thickness of the sixteenth lens is 5.562±0.003mm.

10. The large field-of-view, high-resolution near-eye detection lens according to claim 1 or 2, characterized in that: The center-to-center spacing between the first and second lenses is 0.220±0.003mm; the center-to-center spacing between the second and third lenses is 0.193±0.003mm; the center-to-center spacing between the third and fourth lenses is 0.200±0.003mm; the center-to-center spacing between the fifth and sixth lenses is 0.520±0.003mm; the center-to-center spacing between the sixth and seventh lenses is 3.234±0.003mm; the center-to-center spacing between the seventh and eighth lenses is 9.014±0.003mm; and the center-to-center spacing between the ninth lens and... The center spacing between the tenth lenses is 19.079±0.003mm; the center spacing between the tenth and eleventh lenses is 1.344±0.003mm; the center spacing between the eleventh and twelfth lenses is 3.499±0.003mm; the center spacing between the twelfth and thirteenth lenses is 4.527±0.003mm; the center spacing between the fourteenth and fifteenth lenses is 14.149±0.003mm; and the center spacing between the fifteenth and sixteenth lenses is 2.112±0.003mm.

Images