CN113311567A - Vehicle-mounted forward-looking optical lens - Google Patents

Vehicle-mounted forward-looking optical lens Download PDF

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Publication number
CN113311567A
CN113311567A CN202110601575.9A CN202110601575A CN113311567A CN 113311567 A CN113311567 A CN 113311567A CN 202110601575 A CN202110601575 A CN 202110601575A CN 113311567 A CN113311567 A CN 113311567A
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lens
optical
equal
optical lens
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Inventor
吴喆明
孙振中
刘兴国
刘安民
洪坚
罗艳波
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Sirtec International Suzhou Co ltd
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Sirtec International Suzhou Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention provides a vehicle-mounted forward-looking optical lens which has the characteristics of high resolution, large aperture and large field of view and meets the requirements of an automobile automatic driving system. A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens which are arranged in order from an object side to an image side along an optical axis; a color filter, protective glass and IMA are sequentially arranged behind the image side of the seventh lens; the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface.

Description

Vehicle-mounted forward-looking optical lens
Technical Field
The invention relates to the technical field of lens structures, in particular to a vehicle-mounted forward-looking optical lens.
Background
With the development of the automatic driving technology of the automobile, the technical requirements of the automatic driving system of the automobile on the vehicle-mounted camera are higher and higher. The front-view vehicle-mounted lens is an important component in an automatic driving system of the automobile, and is mainly used for collecting road condition information in front of the automobile and avoiding traffic accidents. The existing forward-looking camera lens has low image resolution and small field depth range, cannot meet the requirement of large field angle while shooting the details of a distant object, cannot accurately monitor the surrounding environment of a vehicle in real time, and has certain driving risk.
Disclosure of Invention
In order to solve the problems, the invention provides a vehicle-mounted forward-looking optical lens which has the characteristics of high resolution, large aperture and large field of view and meets the requirements of an automatic driving system of an automobile.
An on-vehicle forward-looking optical lens, characterized in that: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens which are arranged in order from an object side to an image side along an optical axis;
a color filter, protective glass and IMA are sequentially arranged behind the image side of the seventh lens;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;
the first lens, the second lens and the seventh lens are all glass aspheric lenses, and the third lens, the fourth lens, the fifth lens and the sixth lens are glass spherical lenses.
It is further characterized in that:
the first lens satisfies Nd1 > 1.8 and Vd1 < 45, wherein Nd1 refers to the refractive index of the first lens, and Vd1 refers to the Abbe number of the first lens;
the second lens satisfies Nd2 & gt 1.85 and Vd2 & lt 45, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens;
the third lens satisfies Nd3 & gt 1.75 and Vd3 & lt 45, wherein Nd3 refers to the refractive index of the third lens, and Vd3 refers to the Abbe number of the third lens;
the fourth lens satisfies Nd4 < 1.65 and Vd4 > 55, wherein Nd4 refers to the refractive index of the fourth lens, and Vd4 refers to the Abbe number of the fourth lens; the fourth lens satisfies dn/dt4 < -3X10-6 ℃, wherein dn/dt4 refers to the temperature coefficient of refractive index of the fourth lens;
the seventh lens satisfies Nd7 > 1.75, Vd7 < 50, wherein Nd7 refers to the refractive index of the seventh lens, and Vd7 refers to the Abbe number of the seventh lens;
preferably, the fifth lens and the sixth lens constitute a cemented lens; at this time, the abbe number difference Δ Nd between the two fifth lenses and the sixth lens satisfies: < 35 < delta Nd < 45;
the diaphragm is positioned between the third lens and the fourth lens;
the optical lens formed by the optical lens meets the following parameter condition, wherein BFL/TTL is less than or equal to 0.2, wherein BFL is the distance from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis;
the optical lens formed by the optical lens meets the following parameter conditions, wherein the FOV/h/D is less than or equal to 4.9, and the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens;
the optical lens formed by the optical lens meets the following parameter conditions that FOV multiplied by F/h is more than or equal to 58, wherein FOV represents the maximum view field angle of the optical lens; f represents the integral focal length value of the optical system; h represents the image height corresponding to the maximum field angle of the optical lens;
the optical lens formed by the optical lens meets the following parameter condition that TTL/F is less than or equal to 8, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis;
the optical lens formed by the optical lens meets the following parameter conditions that F1/F is more than or equal to 2 and less than or equal to-1.5, F2/F is more than or equal to 10 and less than or equal to-5.5, F3/F is more than or equal to 2.5 and less than or equal to 3.5, F4/F is more than or equal to 2, F5/F is more than or equal to 1.3 and less than or equal to 2, F6/F is more than or equal to-1, and F7/F is more than or equal to 3 and less than or equal to 6, wherein F1, F2, F3, F4, F5, F6 and F7 sequentially form the focal lengths of the first lens and the seventh lens, and F is the integral focal length value of the optical system.
After the invention is adopted, 4 glass spherical lenses and 3 glass aspheric lenses are combined to form the vehicle-mounted forward-looking optical lens, the vehicle-mounted forward-looking optical lens has simple structure and small volume, the image surface drift is small in the range of-40 degrees to 125 degrees, clear imaging can be realized, the imaging requirement of 800 ten thousand pixels is met, the aperture is large, and the range of a shooting field of view is 120; the automobile automatic driving system has the characteristics of high resolution, large aperture and large field of view, and meets the requirements of an automobile automatic driving system.
Drawings
FIG. 1 is a diagram of a lens structure assembly according to an embodiment of the present invention (the object side is at the leftmost position, and the image side is at the rightmost position);
FIG. 2 is a graph of MTF according to an embodiment of the present invention;
FIG. 3 is a defocus plot at 25 ° in accordance with an embodiment of the present invention;
FIG. 4 is a defocus plot at-40 ° for the example of the present invention;
FIG. 5 is a defocus plot at 125 ° for an embodiment of the present invention;
the names corresponding to the sequence numbers in the figure are as follows:
first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, STOP, color filter IR, and cover glass CG.
Detailed Description
An on-vehicle front-view optical lens, see fig. 1-5: including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, which are arranged in order from the object side to the image side along the optical axis;
a color filter IR, a protective glass CG and an IMA are arranged in this order behind the image side of the seventh lens L7;
the first lens L1 has negative focal power, the object side surface of the first lens L1 is convex, the image side surface of the first lens L1 is concave, and Nd1 is more than 1.8, and Vd1 is less than 45, wherein Nd1 refers to the refractive index of the first lens L1, and Vd1 refers to the Abbe number of the first lens L1;
the second lens L2 has negative focal power, the object side surface of the second lens L2 is concave, the image side surface of the second lens L2 is convex, and the second lens L2 satisfies Nd2 > 1.85 and Vd2 < 45, wherein Nd2 refers to the refractive index of the second lens L2, and Vd2 refers to the Abbe number of the second lens L2;
the third lens L3 has positive focal power, the object-side surface of the third lens is convex, the image-side surface of the third lens is convex, and the third lens L3 satisfies Nd3 > 1.75 and Vd3 < 45, wherein Nd3 refers to the refractive index of the third lens L3, and Vd3 refers to the Abbe number of the third lens L3;
the fourth lens L4 has positive focal power, the object-side surface of the fourth lens L4 is convex, the image-side surface of the fourth lens L4 is convex, and Nd4 < 1.65 and Vd4 > 55 are satisfied, wherein Nd4 refers to the refractive index of the fourth lens L4, and Vd4 refers to the Abbe number of the fourth lens L4; the fourth lens L4 satisfies dn/dt4 < -3X10-6 ℃, wherein dn/dt4 refers to the temperature coefficient of refractive index of the fourth lens L4;
the fifth lens element L5 has positive refractive power, and has a convex object-side surface and a convex image-side surface;
the sixth lens element L6 has negative refractive power, and has a concave object-side surface and a concave image-side surface;
the seventh lens L7 has positive focal power, the object side surface of the seventh lens is convex, the image side surface of the seventh lens is concave, the seventh lens L7 satisfies Nd7 > 1.75, Vd7 < 50, wherein Nd7 refers to the refractive index of the seventh lens L7, and Vd7 refers to the Abbe number of the seventh lens L7;
the first lens L1, the second lens L2, and the seventh lens L7 are all glass aspheric lenses, and the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses.
The optical lens formed by the optical lens meets the following parameter conditions, wherein BFL/TTL is less than or equal to 0.2, wherein BFL is the distance from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis; TTL is the distance on the optical axis from the center of the object-side surface of the first lens element L1 to the image plane of the optical lens;
the optical lens formed by the optical lens meets the following parameter conditions, wherein the FOV/h/D is less than or equal to 4.9, and the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object side surface of the first lens L1 corresponding to the maximum field angle of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens;
the optical lens formed by the optical lens meets the following parameter conditions that FOV multiplied by F/h is more than or equal to 58, wherein FOV represents the maximum view field angle of the optical lens; f represents the integral focal length value of the optical system; h represents the image height corresponding to the maximum field angle of the optical lens;
the optical lens formed by the optical lens meets the following parameter condition that TTL/F is less than or equal to 8, wherein TTL is the distance between the center of the object side surface of the first lens L1 and the imaging surface of the optical lens on the optical axis;
the optical lens formed by the optical lens meets the following parameter conditions that F1/F is more than or equal to 2 and less than or equal to-1.5, F2/F is more than or equal to 10 and less than or equal to-5.5, F3/F is more than or equal to 2.5 and less than or equal to 3, F4/F is more than or equal to 2 and less than or equal to 1.3 and less than or equal to 2, F6/F is more than or equal to-1 and F7/F is more than or equal to 3 and less than or equal to 6, wherein F1, F2, F3, F4, F5, F6 and F7 sequentially form the focal length of the first lens L1 to the seventh lens L7, and F is the integral focal length value of the optical system.
In a specific embodiment, the fifth lens L5 and the sixth lens L6 constitute a cemented lens; at this time, the abbe number difference Δ Nd between the two fifth lens L5 and the sixth lens L6 satisfies: < 35 < delta Nd < 45; the STOP is positioned between the third lens L3 and the fourth lens L4;
the optical parameters are shown in table 1:
TABLE 1
Figure BDA0003092838500000061
When the radii of curvature of the surfaces of the diaphragm, the IR filter and the cover glass in Table 1 are Infinity, this surface is represented as a plane.
The parameter conditions met by the optical lens consisting of the composition are shown in the table 2:
TABLE 2
Item TTL/F FOV×F/h FOV/h/D BFL/TTL
Range 7.95 60 4.8 0.14
The first lens L1, the second lens L2, and the seventh lens L7 are aspherical mirrors, and each aspherical surface shape is described as follows:
Figure BDA0003092838500000071
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is an aspheric high-order coefficient.
The aspheric surface type parameters are shown in table 3:
TABLE 3
Figure BDA0003092838500000072
The vehicle-mounted forward-looking optical lens is formed by combining 4 glass spherical lenses and 3 glass non-spherical lenses, has a simple structure and a small volume, can realize clear imaging due to small image surface drift within a range of-40 degrees to 125 degrees, meets the imaging requirement of 800 ten thousand pixels, has a large aperture and can shoot a field range of 120 degrees; the automobile automatic driving system has the characteristics of high resolution, large aperture and large field of view, and meets the requirements of an automobile automatic driving system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. An on-vehicle forward-looking optical lens, characterized in that: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens which are arranged in order from an object side to an image side along an optical axis;
a color filter, protective glass and IMA are sequentially arranged behind the image side of the seventh lens;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;
the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;
the first lens, the second lens and the seventh lens are all glass aspheric lenses, and the third lens, the fourth lens, the fifth lens and the sixth lens are glass spherical lenses.
2. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the first lens satisfies Nd1 > 1.8 and Vd1 < 45, wherein Nd1 refers to the refractive index of the first lens, and Vd1 refers to the Abbe number of the first lens;
the second lens satisfies Nd2 & gt 1.85 and Vd2 & lt 45, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens;
the third lens satisfies Nd3 & gt 1.75 and Vd3 & lt 45, wherein Nd3 refers to the refractive index of the third lens, and Vd3 refers to the Abbe number of the third lens;
the fourth lens satisfies Nd4 < 1.65 and Vd4 > 55, wherein Nd4 refers to the refractive index of the fourth lens, and Vd4 refers to the Abbe number of the fourth lens; the fourth lens satisfies dn/dt4 < -3X10-6 ℃, wherein dn/dt4 refers to the temperature coefficient of refractive index of the fourth lens;
the seventh lens satisfies Nd7 > 1.75, Vd7 < 50, wherein Nd7 refers to the refractive index of the seventh lens, and Vd7 refers to the Abbe number of the seventh lens.
3. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: and the fifth lens and the sixth lens form a cemented lens.
4. A vehicle mounted forward looking optical lens as claimed in claim 3, wherein: the abbe number difference Δ Nd between the fifth lens and the sixth lens satisfies the following condition: 35 < DeltaNd < 45.
5. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the diaphragm is positioned between the third lens and the fourth lens.
6. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the optical lens formed by the optical lens meets the following parameter condition, wherein BFL/TTL is less than or equal to 0.2, wherein BFL is the distance from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.
7. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the optical lens formed by the optical lens meets the following parameter conditions, wherein the FOV/h/D is less than or equal to 4.9, and the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens.
8. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the optical lens formed by the optical lens meets the following parameter conditions that FOV multiplied by F/h is more than or equal to 58, wherein FOV represents the maximum view field angle of the optical lens; f represents the integral focal length value of the optical system; h represents the image height corresponding to the maximum field angle of the optical lens.
9. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the optical lens formed by the optical lens meets the following parameter condition that TTL/F is less than or equal to 8, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis.
10. A vehicle mounted forward looking optical lens as claimed in claim 1, wherein: the optical lens formed by the optical lens meets the following parameter conditions that F1/F is more than or equal to 2 and less than or equal to-1.5, F2/F is more than or equal to 10 and less than or equal to-5.5, F3/F is more than or equal to 2.5 and less than or equal to 3.5, F4/F is more than or equal to 2, F5/F is more than or equal to 1.3 and less than or equal to 2, F6/F is more than or equal to-1, and F7/F is more than or equal to 3 and less than or equal to 6, wherein F1, F2, F3, F4, F5, F6 and F7 sequentially form the focal lengths of the first lens and the seventh lens, and F is the integral focal length value of the optical system.
CN202110601575.9A 2021-05-31 2021-05-31 Vehicle-mounted forward-looking optical lens Pending CN113311567A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113946040A (en) * 2021-11-11 2022-01-18 厦门力鼎光电股份有限公司 Compact ultra-wide-angle lens
CN114114612A (en) * 2021-10-19 2022-03-01 浙江大华技术股份有限公司 Optical lens and imaging apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114114612A (en) * 2021-10-19 2022-03-01 浙江大华技术股份有限公司 Optical lens and imaging apparatus
CN113946040A (en) * 2021-11-11 2022-01-18 厦门力鼎光电股份有限公司 Compact ultra-wide-angle lens

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