A large-target high-low-temperature confocal ADAS optical device

Abstract

The invention discloses a large-target surface high-low temperature confocal ADAS optical device, which includes, starting from the object side, the following sequence: a first lens with negative focal power; a second lens with negative focal power; a third lens with positive focal power; a fourth lens with positive focal power; a fifth lens with negative focal power; a sixth lens with positive focal power; a seventh lens with positive focal power; an eighth lens with negative focal power; a ninth lens with positive focal power; a first bonded lens formed by bonding the second lens with negative focal power and the third lens with positive focal power; a second bonded lens formed by bonding the fifth lens with negative focal power and the sixth lens with positive focal power; a third bonded lens formed by bonding the seventh lens with positive focal power and the eighth lens with negative focal power; the lens adopts an 8G1GM structure. The lens structure is made compact by reasonably distributing the focal power, thereby greatly reducing the tolerance sensitivity and greatly improving the imaging quality.

Description

Technical Field

[0001] The present invention is mainly aimed at ASAD (Advanced Driver Assistance System) and is a large-target high-low temperature confocal ADAS optical device that ensures no defocusing at -40°C to 105°C. Background Art

[0002] With the improvement of computer technology, precision instrument design and processing technology, and image sensor technology, optical lenses are booming. In the automotive field, people regard vehicle lenses as the "eyes of the car". On the one hand, it is not only a bridge to ADAS (automatic assisted driving), but also one of the important entrances to vehicle network information processing. Since ordinary lenses have poor temperature adaptability and cannot guarantee that they will not be out of focus at -40℃~105℃, which will cause errors in the automatic assisted driving system, large-target high-low temperature confocal optical devices are increasingly favored in the field of ADAS (automatic assisted driving), which has also triggered the design and research of this optical system by a large number of optical designers; for this reason, it is necessary to launch a large-target high-low temperature confocal ADAS optical device. Summary of the invention

[0003] The present invention is mainly aimed at ASAD (Advanced Driver Assistance System) and is a large-target high-low temperature confocal ADAS optical device that ensures no defocusing at -40°C to 105°C.

[0004] In order to achieve the above design requirements, the technical solution provided by the present invention is as follows:

[0005] An optical device with a focal length of 4 mm and a high-low temperature cofocal structure of 8G1GM, comprising a first glass spherical lens L1 with convex-concave negative focal power, a second glass spherical lens L2 with biconcave negative focal power and a third glass spherical lens L3 with biconvex positive focal power, which are sequentially arranged along the incident direction of light, to form a first cemented lens J1 formed by cementing, a fourth glass spherical lens L4 with biconvex positive focal power, a fifth glass spherical lens L5 with biconcave negative focal power and a sixth glass spherical lens L6 with biconvex positive focal power to form a second cemented lens J2 formed by cementing, a seventh glass spherical lens L7 with biconvex positive focal power and an eighth glass spherical lens L8 with convex-concave negative focal power to form a third cemented lens J3 formed by cementing, and a ninth glass aspherical lens L9 with biconvex positive focal power; the focal lengths and refractive indices of the nine lenses of the optical device and the curvature radii of the eight glass lenses respectively satisfy the following conditions:

[0006] <![CDATA[f1=-7±5%]]> <![CDATA[n1=1.5±5%]]> <![CDATA[R 11 =95±5%]]> <![CDATA[R 12 =3.5±5%]]> <![CDATA[f2=-8.2±5%]]> <![CDATA[n2=1.57±5%]]> <![CDATA[R 21 =-9.5±5%]]> <![CDATA[R 22 =9.5±5%]]> <![CDATA[f3=7.3±5%]]> <![CDATA[n3=1.95±5%]]> <![CDATA[R 31 =9.5±5%]]> <![CDATA[R 32 =-25.5±5%]]> <![CDATA[f4=22.2±5%]]> <![CDATA[n4=1.6±5%]]> <![CDATA[R 41 =26±5%]]> <![CDATA[R 42 =-26±5%]]> <![CDATA[f5=-6.3±5%]]> <![CDATA[n5=1.5±5%]]> <![CDATA[R 51 =-5.3±5%]]> <![CDATA[R 52 =8.6±5%]]> <![CDATA[f6=5.7±5%]]> <![CDATA[n6=1.79±5%]]> <![CDATA[R 61 =8.6±5%]]> <![CDATA[R 62 =-8.6±5%]]> <![CDATA[f7=6.4±5%]]> <![CDATA[n7=1.59±5%]]> <![CDATA[R 71 =13±5%]]> <![CDATA[R 72 =-5±5%]]> <![CDATA[f8=-10.7±5%]]> <![CDATA[n8=1.95±5%]]> <![CDATA[R 81 =-5±5%]]> <![CDATA[R 82 =-10±5%]]> <![CDATA[f9=16.6±5%]]> <![CDATA[n9=1.8±5%]]> <![CDATA[R 91 =-19±5%]]> <![CDATA[R 92 =-44±5%]]>

[0007] Table 1

[0008] In the above table: f1-f9 correspond to the focal lengths of the first glass spherical lens L1 to the ninth glass spherical lens L9 respectively; n1-n9 correspond to the refractive indices of the first glass spherical lens L1 to the ninth glass spherical lens L9 respectively; R 11 and R 12 Corresponding to the curvature radius of the first glass spherical lens L1, the R 21 and R 22 Corresponding to the curvature radius of the second glass spherical lens L2, the R 31 and R 32 Corresponding to the curvature radius of the third glass spherical lens L3, the R 41 and R 42 Corresponding to the curvature radius of the fourth glass spherical lens L4, the R 51 and R 52 Corresponding to the curvature radius of the fifth plastic aspherical lens L5, the R 61 and R 62 Corresponding to the curvature radius of the sixth glass spherical lens L6, the R 71 and R 72 Corresponding to the curvature radius of the seventh glass spherical lens L7, the R 81 and R 82 Corresponding to the curvature radius of the eighth glass spherical lens L8, the R 91 and R 92 Corresponding to the curvature radius of the ninth glass spherical lens L9, where “-” indicates the direction is the negative direction.

[0009] The aspheric equation of the glass aspheric lens L9 satisfies:

[0010]

[0011] In the above formula, parameter c is the radius of curvature, y is the radial coordinate, and k is the coefficient of the conic quadratic curve. The ninth glass aspheric lens L9 includes a relative R 91 Surface and R 92 The parameters of the surface are as follows:

[0012]

[0013] Table 2

[0014] The sum of the optical powers of the six spherical lenses of the present invention is within the following range:

[0015]

[0016] Among them, f1, f2, f5, f6, f7, f8, see Table 1.

[0017] The value of FNO. of the present invention is in the following range:

[0018]

[0019] Where f is the focal length of the system and D is the entrance pupil diameter.

[0020] The optical device provided by the present invention effectively ensures that the present invention does not lose focus within a temperature change of -40°C to 85°C. The reasonable use of glass aspheric surfaces can well improve the edge image quality and ensure high imaging quality. The large target surface enables the lens to form a clear image. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a lens assembly diagram of Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of a light path in accordance with a first embodiment of the present invention;

[0023] Figure 3 This is the MTF diagram of the present invention in a low temperature environment of 20°C;

[0024] Figure 4 This is the MTF diagram of the present invention at a normal temperature of -40°C;

[0025] Figure 5 This is the MTF diagram of the present invention under a high temperature environment of 85°C;

[0026] Figure 6 This is the MTF diagram of the present invention under a high temperature environment of 105°C. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It is also necessary to explain that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the contents.

[0028] See also Figure 1 and Figure 2 The present invention comprises a first glass spherical lens L1 with convex-concave negative focal power, a second glass spherical lens L2 with biconcave negative focal power and a third glass spherical lens L3 with biconvex positive focal power, which are sequentially arranged along the incident direction of light, and are glued to form a first glued lens J1, a fourth glass spherical lens L4 with biconvex positive focal power, a fifth glass spherical lens L5 with biconcave negative focal power and a sixth glass spherical lens L6 with biconvex positive focal power, which are glued to form a second glued lens J2, a seventh glass spherical lens L7 with biconvex positive focal power and an eighth glass spherical lens L8 with convex-concave negative focal power, which are glued to form a third glued lens J3, and a ninth glass aspherical lens L9 with biconvex positive focal power; wherein, the lens L1 comprises a relative R 11 Surface and R12 The lens L2 includes an R 21 Surface and R 22 The lens L3 includes an R 31 Surface and R 32 The lens L4 includes an R 41 Surface and R 42 The lens L5 includes a relative R 51 Surface and R 52 The lens L6 includes an R 61 Surface and R 62 The lens L7 includes an R 71 Surface and R 72 The lens L8 includes an R 81 Surface and R 82 The lens L9 includes an R 91 Surface and R 92 Among them, numbers 1-10 correspond to the mirror surfaces of lenses L1-L6, 11 represents the stop STOP, 12-18 correspond to the mirror surfaces of lenses L7-L9, and 19 represents the image plane.

[0029] When the focal lengths and refractive indices of the nine lenses of the optical device and the curvature radii of the eight glass lenses meet the following conditions:

[0030] <![CDATA[f1=-7±5%]]> <![CDATA[n1=1.5±5%]]> <![CDATA[R 11 =95±5%]]> <![CDATA[R 12 =3.5±5%]]> <![CDATA[f2=-8.2±5%]]> <![CDATA[n2=1.57±5%]]> <![CDATA[R 21 =-9.5±5%]]> <![CDATA[R 22 =9.5±5%]]> <![CDATA[f3=7.3±5%]]> <![CDATA[n3=1.95±5%]]> <![CDATA[R 31 =9.5±5%]]> <![CDATA[R 32 =-25.5±5%]]> <![CDATA[f4=22.2±5%]]> <![CDATA[n4=1.6±5%]]> <![CDATA[R 41 =26±5%]]> <![CDATA[R 42 =-26±5%]]> <![CDATA[f5=-6.3±5%]]> <![CDATA[n5=1.5±5%]]> <![CDATA[R 51 =-5.3±5%]]> <![CDATA[R 52 =8.6±5%]]> <![CDATA[f6=5.7±5%]]> <![CDATA[n6=1.79±5%]]> <![CDATA[R 61 =8.6±5%]]> <![CDATA[R 62 =-8.6±5%]]> <![CDATA[f7=6.4±5%]]> <![CDATA[n7=1.59±5%]]> <![CDATA[R 71 =13±5%]]> <![CDATA[R 72 =-5±5%]]> <![CDATA[f8=-10.7±5%]]> <![CDATA[n8=1.95±5%]]> <![CDATA[R 81 =-5±5%]]> <![CDATA[R 82 =-10±5%]]> <![CDATA[f9=16.6±5%]]> <![CDATA[n9=1.8±5%]]> <![CDATA[R 91 =-19±5%]]> <![CDATA[R 92 =-44±5%]]>

[0031] Table 1

[0032] In the above table: f1-f9 correspond to the focal lengths of the first glass spherical lens L1 to the ninth glass spherical lens L9 respectively; n1-n9 correspond to the refractive indices of the first glass spherical lens L1 to the ninth glass spherical lens L9 respectively; R 11 and R 12 Corresponding to the curvature radius of the first glass spherical lens L1, the R 21 and R 22 Corresponding to the curvature radius of the second glass spherical lens L2, the R 31 and R 32 Corresponding to the curvature radius of the third glass spherical lens L3, the R 41 and R 42 Corresponding to the curvature radius of the fourth glass spherical lens L4, the R 51 and R 52 Corresponding to the curvature radius of the fifth plastic aspherical lens L5, the R 61 and R 62 Corresponding to the curvature radius of the sixth glass spherical lens L6, the R 71 and R 72Corresponding to the curvature radius of the seventh glass spherical lens L7, the R 81 and R 82 Corresponding to the curvature radius of the eighth glass spherical lens L8, the R 91 and R 92 Corresponding to the curvature radius of the ninth glass spherical lens L9, where “-” indicates the direction is the negative direction.

[0033] The aspheric equation of the glass aspheric lens L9 satisfies:

[0034]

[0035] In the above formula, parameter c is the radius of curvature, y is the radial coordinate, and k is the coefficient of the conic quadratic curve. The fifth plastic aspheric lens L9 includes a relative R 91 Surface and R 92 The parameters of the surface are as follows:

[0036]

[0037] Table 2

[0038] When the focal length, refractive index, curvature radius and thickness of the nine lenses of the invention respectively meet the conditions in Table 1 above, Figure 3 , Figure 4 , Figure 5 , Figure 6 It can be seen that the MTF curve of this device does not show serious defocusing phenomenon under extreme conditions such as normal temperature of 20 degrees Celsius, low temperature of -40 degrees Celsius, high temperature of 85 degrees Celsius, and high temperature of 105 degrees Celsius.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-target high-low temperature confocal ADAS optical device, characterized in that: The device comprises a first glass spherical lens L1 with convex-concave negative focal power, a first cemented lens J1 formed by cementing a second glass spherical lens L2 with biconcave negative focal power and a third glass spherical lens L3 with biconvex positive focal power, which are arranged in sequence along the incident direction of light, a fourth glass spherical lens L4 with biconvex positive focal power, a second cemented lens J2 formed by cementing a fifth glass spherical lens L5 with biconcave negative focal power and a sixth glass spherical lens L6 with biconvex positive focal power, a third cemented lens J3 formed by cementing a seventh glass spherical lens L7 with biconvex positive focal power and an eighth glass spherical lens L8 with convex-concave negative focal power, and a ninth glass aspherical lens L9 with biconvex positive focal power; the focal lengths and refractive indices of the nine lenses of the optical device and the curvature radii of the eight glass lenses respectively meet the following conditions: In the above table: f1-f9 correspond to the focal lengths of the first glass spherical lens L1 to the ninth glass spherical lens L9 respectively; n1-n9 correspond to the refractive indices of the first glass spherical lens L1 to the ninth glass spherical lens L9 respectively; R 11 and R 12 Corresponding to the curvature radius of the first glass spherical lens L1, the R 21 and R 22 Corresponding to the curvature radius of the second glass spherical lens L2, the R 31 and R 32 Corresponding to the curvature radius of the third glass spherical lens L3, the R 41 and R 42 Corresponding to the curvature radius of the fourth glass spherical lens L4, the R 51 and R 52 Corresponding to the curvature radius of the fifth plastic aspherical lens L5, the R 61 and R 62 Corresponding to the curvature radius of the sixth glass spherical lens L6, the R 71 and R 72 Corresponding to the curvature radius of the seventh glass spherical lens L7, the R 81 and R 82 Corresponding to the curvature radius of the eighth glass spherical lens L8, the R 91 and R 92 Corresponding to the curvature radius of the ninth glass spherical lens L9, where "-" indicates the direction is the negative direction.

2. The optical device according to claim 1, characterized in that: The aspheric equation of the ninth glass aspheric lens L9 of the biconvex positive power satisfies: In the above formula, parameter c is the radius of curvature, y is the radial coordinate, and k is the coefficient of the conic quadratic curve. The ninth glass aspheric lens L9 includes a relative R 91 Surface and R 92 The parameters of the surface are as follows:

3. The optical device according to claim 1, wherein: It also satisfies that the sum of the optical powers of the six spherical lenses is within the following range:

4. The optical device according to claim 1, wherein Also meets the following requirements: The value of FNO. is in the following range: Where f is the focal length of the system and D is the entrance pupil diameter.

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