A global panoramic annular optical system with a large field of view

Abstract

The invention discloses a super-large-field-of-view spherical panoramic annular optical system, comprising a coaxially mounted panoramic annular head lens, a subsequent lens group and a sensor arranged behind the panoramic annular head lens, wherein the panoramic annular head lens comprises PAL1 and PAL2 arranged in sequence from the object side to the image side, and the subsequent lens group comprises RL1, RL2, RL3, RL4, RL5, RL6 and RL7 arranged in sequence from the object side to the image side; wherein the PAL1 and RL1 are meniscus glass lenses with positive optical power, the PAL2, RL3, RL4, RL5 and RL6 are double convex lenses with positive optical power, and the RL2 and RL7 are double concave lenses with negative optical power; the convex surface of the PAL1 faces the object side, and the concave surface faces the image side; the concave surface of the RL1 faces the object side, and the convex surface faces the image side, and all lenses are composed of spherical glass. The panoramic annular optical system of the present invention can realize (55°-120°)×360° ultra-large field of view single gaze imaging on a limited image plane under the premise that all lenses are spherical.

Description

Technical Field

[0001] The present invention relates to the field of visual sensors, including video conferencing, vehicle-mounted systems, etc., and in particular to an ultra-large field of view panoramic annular optical system. Background Art

[0002] The panoramic annular imaging system needs to complete the geometric transformation of objects within an ultra-large field of view onto an image sensor with a limited image surface at one time. When the field of view requirement is too large, the design difficulty of the panoramic annular system will increase. In previous designs, aspherical lenses were often added to improve the image quality of large fields of view, but aspherical glass is difficult to process. If optical plastics are used, the imaging quality will be unstable in extreme environments.

[0003] With the development of computer vision and artificial intelligence, researchers have put forward more detailed and clear requirements for optical sensors. For the panoramic annular belt design, a larger field of view and higher resolution are important research and development directions. The panoramic annular belt improves the imaging quality of a large field of view through the design of refraction and reflection, but when the field of view is greater than 90°, it will gradually become more difficult to increase the field of view. For example, the maximum field of view angle of the panoramic annular belt lens mentioned in the blind spot-free reentrant panoramic imager with patent application publication number CN108181782A is 95°. The maximum field of view angle of the panoramic annular belt lens mentioned in a cylindrical structured light projection device based on a panoramic annular belt projection objective lens with patent application publication number CN109709661A is also 95°. Summary of the invention

[0004] The purpose of the present invention is to provide a panoramic annular optical system with a super large field of view in view of the deficiencies in the prior art, which can meet the large field of view requirements of the panoramic annular optical system through the design of a full-spherical glass.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] An embodiment of the present invention provides a super-large field of view spherical panoramic annular optical system, comprising a coaxially mounted panoramic annular head lens, a subsequent lens group and a sensor arranged behind the panoramic annular head lens, wherein the panoramic annular head lens comprises PAL1 and PAL2 arranged in sequence from the object side to the image side, the subsequent lens group comprises RL1, RL2, RL3, RL4, RL5, RL6, and RL7 arranged in sequence from the object side to the image side, and an aperture is arranged between RL3 and RL4; wherein the PAL1 and RL1 are meniscus glass lenses with positive focal power, the PAL2, RL3, RL4, RL5, and RL6 are double convex lenses with positive focal power, and the RL2 and RL7 are double concave lenses with negative focal power; the convex surface of the PAL1 faces the object side, and the concave surface faces the image side; the concave surface of the RL1 faces the object side, and the convex surface faces the image side, and all lenses are composed of spherical glass.

[0007] Furthermore, the PAL1 and PAL2 are glued together, the overall front surface includes a front transmission surface A1 and a front reflection surface A6 located at the center of the front transmission surface, the overall rear surface includes a rear reflection surface A3 and a rear transmission surface A8 located at the center of the rear reflection surface, and the glued surface is the transmission surface A2.

[0008] Furthermore, the RL1 is a single lens, the front surface is the transmission surface B1, and the rear surface is the transmission surface B2.

[0009] Furthermore, the RL2 and RL3 are glued together, the front surface is the transmission surface C1, the rear surface is the transmission surface C3, and the middle transmission glued surface is C2.

[0010] Furthermore, the RL4 is a single lens, the front surface is the transmission surface D1, and the rear surface is the transmission surface D2.

[0011] Furthermore, the RL5 is a single lens, the front surface is the transmission surface E1, and the rear surface is the transmission surface E2.

[0012] Furthermore, the RL6 and RL7 are glued together, the front surface is the transmission surface F1, the rear surface is the transmission surface F3, and the middle transmission glued surface is F2.

[0013] Furthermore, the parameters of each surface along the light path are as follows:

[0014] A1 surface, the curvature radius ranges from 36.90 to 37.90, the center thickness ranges from 14.40 to 15.40, the refractive index ranges from 1.60 to 1.65, the Abbe number ranges from 53 to 54, and the effective semi-aperture ranges from 29.60 to 30.60;

[0015] A2 surface, the curvature radius ranges from 77.90 to 78.90, the center thickness ranges from 14.60 to 15.60, the refractive index ranges from 1.65 to 1.70, the Abbe number ranges from 55 to 56, and the effective semi-aperture ranges from 29.60 to 30.60;

[0016] A3 surface, the curvature radius ranges from -22.70 to -21.70, the center thickness ranges from -15.60 to -14.60, the refractive index is 1, the Abbe number is 0, and the effective half-aperture ranges from 17.00 to 18.00;

[0017] A4 surface, the curvature radius ranges from 77.90 to 78.90, the center thickness ranges from -15.40 to -14.40, the refractive index ranges from 1.60 to 1.65, the Abbe number ranges from 53 to 54, and the effective semi-aperture ranges from 14.30 to 15.30;

[0018] A5 surface, the curvature radius ranges from 36.90 to 37.90, the center thickness ranges from 3.60 to 4.60, the refractive index ranges from 1.60 to 1.65, the Abbe number ranges from 53 to 54, and the effective semi-aperture ranges from 4.20 to 5.20;

[0019] A6 surface, the curvature radius ranges from -24.90 to -23.90, the center thickness ranges from 10.30 to 11.30, the refractive index is 1, the Abbe number is 0, and the effective half-aperture ranges from 6.00 to 7.00;

[0020] A7 surface, the curvature radius ranges from 77.90 to 78.90, the center thickness ranges from 14.60 to 15.60, the refractive index ranges from 1.65 to 1.70, the Abbe number ranges from 55 to 56, and the effective semi-aperture ranges from 5.80 to 6.80;

[0021] A8 surface, the curvature radius ranges from -22.70 to -21.70, the center thickness ranges from 4.10 to 5.10, and the effective semi-diameter ranges from 5.40 to 6.40;

[0022] B1 surface, the curvature radius ranges from -24.90 to -23.90, the center thickness ranges from 8.10 to 9.10, the refractive index ranges from 1.80 to 1.90, the Abbe number ranges from 46 to 47, and the effective semi-aperture ranges from 4.20 to 5.20;

[0023] B2 surface, the curvature radius ranges from -19.50 to -18.50, the center thickness ranges from 6.30 to 7.30, and the effective semi-diameter ranges from 3.90 to 4.90;

[0024] C1 surface, the curvature radius ranges from -7.30 to -6.30, the center thickness ranges from 2.50 to 3.50, the refractive index ranges from 1.70 to 1.80, the Abbe number ranges from 34 to 36, and the effective semi-aperture ranges from 1.90 to 2.90;

[0025] C2 surface, curvature radius range is 11.60~12.60, center thickness range is 4.70~5.70, refractive index range is 1.50~1.60, Abbe number range is 57~58, effective semi-aperture range is 1.90~2.90;

[0026] C3 surface, the curvature radius ranges from -10.90 to -9.90, the center thickness ranges from 0.50 to 1.50, and the effective semi-diameter ranges from 2.00 to 3.00;

[0027] The aperture surface has an infinite radius of curvature, a center thickness range of 0.50 to 1.50, and an effective semi-aperture range of 1.90 to 2.90;

[0028] D1 surface, curvature radius range is 365.00~375, center thickness range is 2.80~3.80, refractive index range is 1.50~1.60, Abbe number range is 57~58, effective semi-aperture range is 2.10~3.10;

[0029] D2 surface, the curvature radius ranges from -17.90 to -16.90, the center thickness ranges from 3.90 to 4.90, and the effective semi-diameter ranges from 2.50 to 3.50;

[0030] E1 surface, curvature radius range is 34.00~35.00, center thickness range is 2.50~3.50, refractive index range is 1.55~1.65, Abbe number range is 68~69, effective semi-aperture range is 3.10~4.10;

[0031] E2 surface, the curvature radius ranges from -45.00 to -44.00, the center thickness ranges from 0.50 to 1.50, and the effective semi-diameter ranges from 3.10 to 4.10;

[0032] F1 surface, the curvature radius ranges from 7.90 to 8.90, the center thickness ranges from 3.90 to 4.90, the refractive index ranges from 1.65 to 1.75, the Abbe number ranges from 49 to 50, and the effective semi-aperture ranges from 3.10 to 4.10;

[0033] F2 surface, the curvature radius ranges from -17.20 to -16.20, the center thickness ranges from 1.10 to 2.10, the refractive index ranges from 1.60 to 1.70, the Abbe number ranges from 32 to 34, and the effective semi-aperture ranges from 2.50 to 3.50;

[0034] F3 surface, the curvature radius ranges from 3.90 to 4.90, the center thickness ranges from 9.80 to 10.80, and the effective semi-diameter ranges from 2.00 to 3.00;

[0035] Sensor surface, the curvature radius range is infinite, and the effective semi-aperture range is 3.00~4.00;

[0036] According to the ray tracing principle in the design, each surface that the light passes through needs to be marked separately, so A5 and A1 are the same surface, and A4, A7 and A2 are the same surface.

[0037] Furthermore, when in use, the optical axis is placed perpendicular to the ground, and the ultra-large field of view spherical panoramic annular optical system projects light emitted by objects within 360° around the optical axis and within 55° to 120° on the horizontal line onto the sensor imaging surface. The imaging surface is annular with a circular blind spot in the center.

[0038] The beneficial effect of the present invention is that the panoramic annular optical system of the present invention adopts a spherical glass lens design, including two groups of double-cemented lenses. Compared with the previous panoramic annular lens with a maximum field of view of only about 100°, the field of view angle of the present invention can reach 120°, the imaging effect is significantly improved, and it is easy to process and manufacture, the visible light resolution reaches 5 million pixels, the image quality is good, and the image is displayed with high resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 This is an optical structure diagram of a global panoramic annular optical system with a super-large field of view according to an embodiment of the present invention;

[0041] Figure 2 It is a marking diagram of each surface along the optical path direction in the ultra-large field of view full-spherical panoramic annular optical system according to an embodiment of the present invention;

[0042] Figure 3 is an MTF curve diagram of an embodiment of the present invention under visible light 486-656nm;

[0043] Figure 4 It is a standard spot diagram of the embodiment of the present invention under visible light 486-656nm;

[0044] Figure 5 is a field curvature distortion diagram of an embodiment of the present invention under visible light 486-656nm;

[0045] Figure 6 is an optical path difference diagram of an embodiment of the present invention under visible light 486-656nm;

[0046] Figure 7 is a magnification chromatic aberration diagram of an embodiment of the present invention under visible light 486-656nm;

[0047] Figure 8 It is a relative illumination curve diagram of an embodiment of the present invention under visible light 486-656nm. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 As shown, it is an optical structure diagram of the ultra-large field of view full-spherical panoramic annular optical system of the present invention. The ultra-large field of view full-spherical panoramic annular optical system comprises a coaxially mounted panoramic annular head lens (PAL), a subsequent lens group (RL) placed behind the panoramic annular head lens, and a sensor. The panoramic annular head lens comprises optical lenses arranged in sequence from the object side to the image side: PAL1 and PAL2; the subsequent lens group comprises RL1, RL2, RL3, RL4, RL5, RL6, and RL7 arranged in sequence from the object side to the image side, and the aperture surface is located between RL3 and RL4; the PAL1 and RL1 are meniscus glass lenses with positive focal power, the PAL2, RL3, RL4, RL5, and RL6 are double convex lenses with positive focal power, and the RL2 and RL7 are double concave lenses with negative focal power; the convex surface of the PAL1 faces the object side, and the concave surface faces the image side; the concave surface of the RL1 faces the object side, and the convex surface faces the image side. All lenses are made of spherical glass.

[0051] like Figure 2 As shown in the figure, it is a marking diagram of each surface along the optical path direction in the ultra-large field of view full-spherical panoramic annular optical system of the present invention; wherein the PAL1 and PAL2 are glued together, the overall front surface includes a front transmission surface A1 and a front reflection surface A6 located at the center of the front transmission surface, the overall rear surface includes a rear reflection surface A3 and a rear transmission surface A8 located at the center of the rear reflection surface, and the glued surface is the transmission surface A2; the RL1 is a single lens, the front surface is the transmission surface B1, and the rear surface is the transmission surface B2; the RL2 and RL3 are glued together, the front surface is the transmission surface C1, the rear surface is the transmission surface C3, and the middle transmission surface is The transmission bonding surface is C2; the RL4 is a single lens, the front surface is the transmission surface D1, and the rear surface is the transmission surface D2; the RL5 is a single lens, the front surface is the transmission surface E1, and the rear surface is the transmission surface E2; the RL6 and RL7 are glued together, the front surface is the transmission surface F1, the rear surface is the transmission surface F3, and the middle transmission bonding surface is F2; ​​the incident light is refracted from the annular transmission surface A1, reflected by the annular reflection surface A3 to the circular reflection surface A6, and then reflected by the circular reflection surface A6, refracted by the circular transmission surface A8 and then emitted, and the emitted light is converged to the sensor through the rear group of refracting lenses.

[0052] When the ultra-large field of view full-spherical panoramic annular optical system is in use, the optical axis is placed perpendicular to the ground. The ultra-large field of view full-spherical panoramic annular optical system projects light emitted by objects within 360° around the optical axis and within 55° to 120° on the horizontal line onto the sensor imaging surface. The imaging surface is annular with a circular blind spot in the center.

[0053] Figures 3 to 8 The optical performance curve diagram of the present invention applied to the implementation case, wherein:

[0054] Figure 3 This is the MTF curve of the present invention under the visible light of 486nm-656nm. The MTF curve represents the comprehensive resolution level of an optical system. Figure 2 It can be seen that the full-field MTF value at 130lp / mm is ≥0.45, which is close to the diffraction limit, the image is clear, and meets the resolution requirements. In addition, the MTF performance of this optical system at each wavelength is also very good.

[0055] Figure 4 This is the spot diagram of the present invention under visible light of 486nm-656nm, where the wavelengths are F light (486nm), D light (588nm) and C light (656nm), and the weight ratio is 1:1:1. The pixel size of the sensor used is 3.45 microns. It can be seen from the figure that each field of view in the spot diagram is smaller than the pixel size.

[0056] Figure 5 The figure is a field curvature and distortion curve diagram of the present invention under the visible light of 486nm-656nm. The distortion curve diagram represents the F-Theta distortion value under different fields of view, and the unit is %. Figure 4 It can be seen that the absolute value of F-Theta distortion is ≤1%.

[0057] Figure 6 This is the optical path difference diagram of the present invention under visible light 486nm-656nm, which shows the wavefront phase error of imaging. Figure 5 It can be seen that the optical path difference in each field of view is ≤±0.5waves.

[0058] Figure 7 This is a magnification chromatic aberration curve diagram of the present invention under visible light 486nm-656nm. It can be seen from the figure that the magnification chromatic aberration curves of each wavelength are all within the Airy disk, indicating that the chromatic aberration is well corrected.

[0059] Figure 8 This is a relative illumination curve diagram of the present invention under visible light 486nm-656nm. Figure 7 It can be seen that the curve descends smoothly, the relative illumination value under the maximum field of view is greater than 0.84, the imaging picture is bright, and the illumination is uniform.

[0060] In the implementation case of the present invention, the overall focal length value of the optical system is EFL, the aperture value is FNO, the field of view angle is FOV, and the total length of the optical system is TTL.

[0061] Preferred parameter values ​​of the present invention (Table 1):

[0062] EFL=-1.68, FNO=4.46, FOV=(55°~120°)×360°, image plane size is 8.4mm×7.1mm, TTL=88mm, the photosensitive imaging chip is SONY's IMX264 CMOS, unit: mm.

[0063] Table 1

[0064]

[0065]

[0066] In the table, A1 and A5 are the same surface, A2 and A4 and A7 are the same surface, and the order of the surfaces in the table is arranged according to the order of ray tracing.

[0067] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A super-large field of view spherical panoramic annular optical system, characterized in that: The invention comprises a coaxially mounted panoramic ring band head lens, a subsequent lens group and a sensor arranged behind the panoramic ring band head lens, wherein the panoramic ring band head lens comprises PAL1 and PAL2 arranged in sequence from the object side to the image side, and the subsequent lens group comprises RL1, RL2, RL3, RL4, RL5, RL6 and RL7 arranged in sequence from the object side to the image side. An aperture is arranged between RL3 and RL4; wherein the PAL1 and RL1 are meniscus glass lenses with positive focal power, the PAL2, RL3, RL4, RL5, and RL6 are double convex lenses with positive focal power, and the RL2 and RL7 are double concave lenses with negative focal power; the convex surface of the PAL1 faces the object side, and the concave surface faces the image side; the concave surface of the RL1 faces the object side, and the convex surface faces the image side, and all lenses are made of spherical glass; the PAL1 and PAL2 are glued together, and the overall front surface includes a front transmission surface A1 and a front reflection surface A6 located at the center of the front transmission surface, and the overall rear surface includes a rear reflection surface A3 and a rear reflection surface A6 located at the center of the rear reflection surface The rear transmission surface A8, the bonding surface is the transmission surface A2; the RL1 is a single lens, the front surface is the transmission surface B1, and the rear surface is the transmission surface B2; the RL2 and RL3 are bonded together, the front surface is the transmission surface C1, the rear surface is the transmission surface C3, and the intermediate transmission bonding surface is C2; the RL4 is a single lens, the front surface is the transmission surface D1, and the rear surface is the transmission surface D2; the RL5 is a single lens, the front surface is the transmission surface E1, and the rear surface is the transmission surface E2; the RL6 and RL7 are bonded together, the front surface is the transmission surface F1, the rear surface is the transmission surface F3, and the intermediate transmission bonding surface is F2; ​​the parameters of each surface along the optical path are as follows: A1 surface, the curvature radius ranges from 36.90 to 37.90 mm, the center thickness ranges from 14.40 to 15.40 mm, the refractive index ranges from 1.60 to 1.65 mm, the Abbe number ranges from 53 to 54 mm, and the effective semi-aperture ranges from 29.60 to 30.60 mm; A2 surface, the curvature radius ranges from 77.90 to 78.90 mm, the center thickness ranges from 14.60 to 15.60 mm, the refractive index ranges from 1.65 to 1.70 mm, the Abbe number ranges from 55 to 56 mm, and the effective semi-aperture ranges from 29.60 to 30.60 mm; A3 surface, curvature radius range is -22.70~-21.70 mm, center thickness range is -15.60~-14.60 mm, refractive index is 1 mm, Abbe number is 0 mm, effective semi-aperture range is 17.00~18.00 mm; A4 surface, the curvature radius ranges from 77.90 to 78.90 mm, the center thickness ranges from -15.40 to -14.40 mm, the refractive index ranges from 1.60 to 1.65 mm, the Abbe number ranges from 53 to 54 mm, and the effective semi-aperture ranges from 14.30 to 15.30 mm; A5 surface, curvature radius range is 36.90~37.90 mm, center thickness range is 3.60~4.60 mm, refractive index range is 1.60~1.65 mm, Abbe number range is 53~54 mm, effective semi-aperture range is 4.20~5.20 mm; A6 surface, curvature radius range is -24.90~-23.90 mm, center thickness range is 10.30~11.30 mm, refractive index is 1 mm, Abbe number is 0 mm, effective semi-aperture range is 6.00~7.00 mm; A7 surface, the curvature radius ranges from 77.90 to 78.90 mm, the center thickness ranges from 14.60 to 15.60 mm, the refractive index ranges from 1.65 to 1.70 mm, the Abbe number ranges from 55 to 56 mm, and the effective semi-aperture ranges from 5.80 to 6.80 mm; A8 surface, the curvature radius ranges from -22.70 to -21.70 mm, the center thickness ranges from 4.10 to 5.10 mm, and the effective semi-diameter ranges from 5.40 to 6.40 mm; B1 surface, the curvature radius ranges from -24.90 to -23.90 mm, the center thickness ranges from 8.10 to 9.10 mm, the refractive index ranges from 1.80 to 1.90 mm, the Abbe number ranges from 46 to 47 mm, and the effective semi-aperture ranges from 4.20 to 5.20 mm; B2 surface, the curvature radius ranges from -19.50 to -18.50 mm, the center thickness ranges from 6.30 to 7.30 mm, and the effective semi-diameter ranges from 3.90 to 4.90 mm; C1 surface, the curvature radius ranges from -7.30 to -6.30 mm, the center thickness ranges from 2.50 to 3.50 mm, the refractive index ranges from 1.70 to 1.80 mm, the Abbe number ranges from 34 to 36 mm, and the effective semi-aperture ranges from 1.90 to 2.90 mm; C2 surface, the curvature radius ranges from 11.60 to 12.60 mm, the center thickness ranges from 4.70 to 5.70 mm, the refractive index ranges from 1.50 to 1.60 mm, the Abbe number ranges from 57 to 58 mm, and the effective semi-aperture ranges from 1.90 to 2.90 mm; C3 surface, the curvature radius ranges from -10.90 to -9.90 mm, the center thickness ranges from 0.50 to 1.50 mm, and the effective semi-diameter ranges from 2.00 to 3.00 mm; The aperture surface has an infinite radius of curvature, a center thickness range of 0.50-1.50 mm, and an effective semi-aperture range of 1.90-2.90 mm; D1 surface, curvature radius range is 365.00~375 mm, center thickness range is 2.80~3.80 mm, refractive index range is 1.50~1.60 mm, Abbe number range is 57~58 mm, effective semi-aperture range is 2.10~3.10 mm; D2 surface, the curvature radius ranges from -17.90 to -16.90 mm, the center thickness ranges from 3.90 to 4.90 mm, and the effective semi-diameter ranges from 2.50 to 3.50 mm; E1 surface, curvature radius range is 34.00~35.00 mm, center thickness range is 2.50~3.50 mm, refractive index range is 1.55~1.65, Abbe number range is 68~69 mm, effective semi-aperture range is 3.10~4.10 mm; E2 surface, the curvature radius ranges from -45.00 to -44.00 mm, the center thickness ranges from 0.50 to 1.50 mm, and the effective semi-diameter ranges from 3.10 to 4.10 mm; F1 surface, curvature radius ranges from 7.90 to 8.90 mm, center thickness ranges from 3.90 to 4.90 mm, refractive index ranges from 1.65 to 1.75 mm, Abbe number ranges from 49 to 50 mm, and effective semi-aperture ranges from 3.10 to 4.10 mm; F2 surface, curvature radius range is -17.20~-16.20 mm, center thickness range is 1.10~2.10 mm, refractive index range is 1.60~1.70 mm, Abbe number range is 32~34 mm, effective semi-aperture range is 2.50~3.50 mm; F3 surface, the curvature radius ranges from 3.90 to 4.90 mm, the center thickness ranges from 9.80 to 10.80 mm, and the effective semi-diameter ranges from 2.00 to 3.00 mm; Sensor surface, curvature radius range is infinite, effective semi-aperture range is 3.00~4.00 mm; According to the ray tracing principle in the design, each surface that the light passes through needs to be marked separately, so A5 and A1 are the same surface, and A4, A7 and A2 are the same surface; when in use, the optical axis is placed perpendicular to the ground, and the ultra-large field of view spherical panoramic annular optical system projects the light emitted by objects within 360° around the optical axis and within 55° to 120° on the horizontal line onto the sensor imaging surface. The imaging surface is annular, and there is a circular blind spot in the center; The incident light is refracted from the annular transmission surface A1, reflected by the annular reflection surface A3 to the circular reflection surface A6, and then reflected by the circular reflection surface A6 and refracted by the circular transmission surface A8 before being emitted. The emitted light is converged onto the sensor through the rear group of refractive lenses; and when the full field MTF value is ≥0.45, it is close to the diffraction limit, the image is clear, and the resolution requirement is met; the photosensitive imaging chip of the optical system is SONY's IMX264 CMOS.

Images