CN108490589B - Fixed-focus optical system - Google Patents
Fixed-focus optical system Download PDFInfo
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- CN108490589B CN108490589B CN201810611770.8A CN201810611770A CN108490589B CN 108490589 B CN108490589 B CN 108490589B CN 201810611770 A CN201810611770 A CN 201810611770A CN 108490589 B CN108490589 B CN 108490589B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 32
- 238000003384 imaging method Methods 0.000 claims abstract description 10
- 239000011521 glass Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- 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 discloses a fixed-focus optical system, which is provided with seven lenses from an object side to an image side, wherein a first lens has negative focal power, an object side convex surface and an image side concave surface; the second lens is provided with negative focal power, an object side convex surface and an image side concave surface; the third lens has positive focal power and biconvex surface; the image side surface of the fourth lens is a convex surface, when the focal power is positive, C4o is more than or equal to 0, C4o is the curvature of the object side surface of the fourth lens, and when the focal power is negative, the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power and biconvex surface; the sixth lens has negative focal power and double concave surfaces; the seventh lens has positive focal power and biconvex surface; and satisfies the following: 1.28< Imeg/f <2.22;0.105< Imeg/TTL <0.167; wherein, ineg is the biggest half image height, TTL is the on-axis distance of first lens thing side to imaging plane, and f is the system focal length, and advantage lies in collocation rationally focal power, through reasonable parameter matching, realizes high resolution, and imaging quality is good, with low costs, miniaturized optical system design.
Description
Technical Field
The invention relates to an optical system, in particular to a fixed-focus optical system which can be applied to the field of vehicle-mounted or monitoring.
Background
With the rapid development of social economy and science, vehicle-mounted imaging and security monitoring systems are becoming more and more popular and high-end. And as the technology of the semiconductor manufacturing industry is mature, the pixel size of the chip is smaller and more compact. The need for high resolution imaging systems is increasing.
Because the wide-angle system has the characteristic of large field of view, more information can be realized by one image acquisition. Therefore, the wide-angle system has great advantages in the field of vehicle-mounted looking around and large-vision monitoring. A typical wide-angle lens achieves a wide-angle effect using 5 or more lenses, with a typical wide-angle system having a maximum field angle of about 180 degrees. However, the existing wide-angle lens has a large length, which is not beneficial to the miniaturization requirement of the lens.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fixed focus optical system which meets the requirements of miniaturization, light weight, high resolution, wide angle and low temperature drift of an optical system and can be applied to the field of vehicle-mounted or monitoring.
The technical scheme adopted for solving the technical problems is as follows: the fixed-focus optical system is provided with a first lens, a second lens, a third lens, a fourth lens, an aperture diaphragm, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side, wherein the first lens has negative focal power, an object side convex surface and an image side concave surface; the second lens is provided with negative focal power, an object side convex surface and an image side concave surface; the third lens has positive focal power and biconvex surface; the image side surface of the fourth lens is a convex surface, when the focal power is positive, C4o is more than or equal to 0, C4o is the curvature of the object side surface of the fourth lens, and when the focal power is negative, the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power and biconvex surface; the sixth lens is provided with negative focal power and double concave surfaces; the seventh lens has positive focal power and biconvex surface;
and satisfies the following: 1.28< Imeg/f <2.22;
0.105<Imeg/TTL<0.167；
wherein ineg is the maximum half image height, TTL is the on-axis distance from the object side surface to the imaging surface of the first lens, and f is the focal length of the system.
f satisfies the following: f is more than or equal to 0.9mm and less than or equal to 1.4mm; the total optical length satisfies: TTL is more than or equal to 12mm and less than or equal to 17mm.
Further, the system satisfies the following relationship: 1.4 < f 5< 5, wherein f5 is the effective focal length of the fifth lens.
Further, when the fourth lens is positive power: satisfies that f4/f is less than or equal to 8 and less than or equal to 11, and C4o is more than or equal to 0, wherein f4 is the effective focal length of the fourth lens, and f4< -200mm when the fourth lens is of negative focal power.
Further, the third lens, the sixth lens and the seventh lens are aspheric plastic lenses.
Further, the fifth lens and the sixth lens satisfy 0.5 < R5i/R6o < 1.3, wherein R5i is the curvature radius of the image side surface of the fifth lens; r6o is the radius of curvature of the sixth lens object-side surface.
Further, a filter is arranged behind the seventh lens.
Compared with the prior art, the invention has the advantages that the reasonable focal power is matched, the high resolution is realized through reasonable parameter matching, the imaging quality is good, the cost is low, and the design of a miniaturized optical system is realized; the invention has the advantages of miniaturization, light weight and ultra-large visual angle which can reach 200 degrees, and can realize the purpose of large-scale monitoring; and a glass-plastic mixed combination mode is adopted to realize the effect of low-temperature bleaching.
Drawings
FIG. 1 is an optical block diagram of embodiment 1 of the present invention;
FIG. 2 is a graph of the transfer function of example 1 of the present invention;
FIG. 3 is a distortion chart of example 1 of the present invention;
FIG. 4 is a graph of relative illuminance for example 1 of the present invention;
FIG. 5 is an optical block diagram of embodiment 2 of the present invention;
FIG. 6 is a graph of the transfer function of example 2 of the present invention;
FIG. 7 is a distortion chart of example 2 of the present invention;
FIG. 8 is a graph of relative illuminance according to embodiment 2 of the present invention;
FIG. 9 is an optical construction diagram of embodiment 3 of the present invention;
FIG. 10 is a graph of the transfer function of example 3 of the present invention;
FIG. 11 is a distortion chart of example 3 of the present invention;
fig. 12 is a relative illuminance map of example 3 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
the seven-piece fixed focus optical system of the present embodiment refers to fig. 1. The following are arranged from the object side to the image side: the lens comprises a first lens L1 with negative focal power, a second lens L2 with negative focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, an aperture stop STO, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, an optical filter L8 and chip protection glass L9.
Wherein: l1 is a convex object side S1o, L2 is a concave negative lens of an object side S2o, focal length is f1, L2 is a convex center of an object side S2o, L3 is a positive lens of a concave object side S3o and an image side S3i, focal length is f2, L3 is a positive lens of a convex object side S4o, L4 is an object side S4o plane, L4 i is a positive lens of a convex image side S4i, focal length is f4, at this time, C4o=0 is satisfied, L5 is a positive lens of a convex object side S5o and an image side S5i, focal length is f5, L6 is a negative lens of a concave object side S6o and an image side S6i, focal length is f6, L7 is a positive lens of a convex object side S7o and an image side S7i, focal length is f 7o and an image side S8i are plane optical filters, L9 is a chip protection glass of a plane and image side S9o and an image side S9i is SImg.
In the present embodiment, the first lens L1, the fourth lens L4 and the fifth lens L5 are made of glass material, the second lens L2, the third lens L3, the sixth lens L6 and the seventh lens L7 are made of plastic material; the second lens L2, the third lens L3, the sixth lens L6 and the seventh lens L7 are aspheric lenses, respectively, and the following equations are satisfied:
y represents a radial coordinate value of the lens perpendicular to the optical axis, Z is a distance vector height from the aspherical vertex when the aspherical lens is at a position with a height y along the optical axis direction, c=1/R, R represents a central curvature radius of the corresponding aspherical lens surface, k represents a conic coefficient, and the parameter A, B, C, D, E, F is a higher order aspherical coefficient.
The main design parameters of this example are shown in the following table:
wherein C4o is the curvature of the fourth lens object side; r5i is the radius of curvature of the image-side surface of the fifth lens element; r6o is the radius of curvature of the sixth lens object-side surface. Ineg is the maximum half image height.
In this embodiment, the physical optical parameters of the entire lens are expressed as follows:
the aspherical lens higher order term coefficients in this embodiment are as follows (A: 4 th order term, B:6 th order term, C:8 th order term, D:10 th order term, E:12 th order term):
the embodiment 1 of the invention adopts a seven-piece structure, realizes a shorter focal length of about 1.28mm, has a maximum field angle of more than 200 degrees and small volume, and is a high-definition imaging system with the total length of 14.2 mm.
Embodiment two:
the seven-plate fixed focus optical system in this embodiment refers to fig. 5. In order from the object side to the image side, there are: the lens comprises a first lens L1 with negative focal power, a second lens L2 with negative focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, an aperture stop STO, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, an optical filter L8 and chip protection glass L9.
Wherein: l1 is a negative lens with a convex object side S1o, a concave image side S1i, a focal length f1, L2 is a negative lens with a concave object side S2o, a concave image side S2i, a focal length f2, L3 is a positive lens with a convex object side S3o and an convex image side S3i, a focal length f3, L4 is a convex object side S4o, a convex image side S4i is a positive lens with a focal length f4, C4o >0 is satisfied, L5 is a positive lens with a convex object side S5o and an image side S5i, a focal length f5, L6 is a negative lens with a concave object side S6o and an image side S6i, a focal length f6, L7 is a positive lens with a convex object side S7o and an image side S7i, a focal length f7, L8 is a filter with a flat object side S8o and an image side S9i, L9 is a chip protection glass with a flat object side S9o and an image side S9i, and an image side SImg is formed.
The main design parameters of this example are shown in the following table:
wherein C4o is the curvature of the fourth lens object side; r5i is the radius of curvature of the image-side surface of the fifth lens element; r6o is the radius of curvature of the sixth lens object-side surface. Ineg is the maximum half image height.
In this embodiment, the physical optical parameters of the entire lens are expressed as follows:
the aspherical lens higher order term coefficients in this embodiment are as follows (A: 4 th order term, B:6 th order term, C:8 th order term, D:10 th order term, E:12 th order term):
the embodiment 2 of the invention adopts a seven-piece structure, realizes a shorter focal length of about 1.27mm, has a maximum field angle of more than 200 degrees and small volume, and is a high-definition imaging system with a total length of about 14 mm.
Embodiment III:
the seven-plate fixed focus optical system in this embodiment refers to fig. 9. In order from the object side to the image side, there are: the lens comprises a first lens L1 with negative focal power, a second lens L2 with negative focal power, a third lens L3 with positive focal power, a fourth lens L4 with negative focal power, an aperture stop STO, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, an optical filter L8 and chip protection glass L9.
Wherein: l1 is a negative lens with a convex object side S1o, a concave image side S1i, a focal length f1, L2 is a negative lens with a concave object side S2o, a concave image side S2i, a focal length f2, L3 is a positive lens with a convex object side S3o and an convex image side S3i, a focal length f3, L4 is a concave object side S4o, a convex image side S4i is a positive lens with a focal length f4, at this time, C4o=0 is satisfied, L5 is a positive lens with a convex object side S5o and an image side S5i, a focal length f5, L6 is a negative lens with a concave object side S6o and an image side S6i, a focal length f6, L7 is a positive lens with a convex object side S7o and an image side S7i, a focal length f 7o is a filter with a flat object side S8o and an image side S8i, L9 is a chip protection glass with a flat object side S9o and an image side S9i, and an image side SImg is formed.
The main design parameters of this example are shown in the following table:
wherein R5i is the radius of curvature of the image side surface of the fifth lens; r6o is the radius of curvature of the sixth lens object-side surface. Ineg is the maximum half image height.
In this embodiment, the physical optical parameters of the entire lens are expressed as follows:
/>
the aspherical lens higher order term coefficients in this embodiment are as follows (A: 4 th order term, B:6 th order term, C:8 th order term, D:10 th order term, E:12 th order term):
/>
the embodiment 3 of the invention adopts a seven-piece structure, realizes a shorter focal length of about 1.2mm, has a maximum field angle of more than 200 degrees and small volume, and is a high-definition imaging system with a total length of about 14 mm.
The foregoing description of the embodiments of the present invention is merely illustrative, and the scope of the invention is not limited to the embodiments of the invention, but can be modified according to the scope of the appended claims.
Claims (5)
1. A fixed focus optical system, characterized by: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, an aperture diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side, wherein the first lens has negative focal power, an object side convex surface and an image side concave surface; the second lens is provided with negative focal power, an object side convex surface and an image side concave surface; the third lens has positive focal power and biconvex surface; the image side surface of the fourth lens is a convex surface, when the focal power is positive, C4o is more than or equal to 0, C4o is the curvature of the object side surface of the fourth lens, and when the focal power is negative, the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power and biconvex surface; the sixth lens is provided with negative focal power and double concave surfaces; the seventh lens has positive focal power and biconvex surface;
and satisfies the following: 1.28< Imeg/f <2.22;
0.105<Imeg/TTL<0.167；
wherein, ineg is the maximum half image height, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, f is the focal length of the system, and f satisfies: f is more than or equal to 0.9mm and less than or equal to 1.4mm; the total optical length satisfies: TTL is more than or equal to 12mm and less than or equal to 17mm, and the system meets the following relational expression: 1.4mm < f 5< 5 mm, where f5 is the effective focal length of the fifth lens.
2. A fixed focus optical system as claimed in claim 1, wherein: when the fourth lens is positive focal power: satisfies that f4/f is less than or equal to 8 and less than or equal to 11, and C4o is more than or equal to 0, wherein f4 is the effective focal length of the fourth lens, and f4< -200mm when the fourth lens is of negative focal power.
3. A fixed focus optical system as claimed in claim 1, wherein: the third lens, the sixth lens and the seventh lens are aspheric plastic lenses.
4. A fixed focus optical system as claimed in claim 1, wherein: the fifth lens and the sixth lens meet the condition that R5i/R6o is smaller than 1.3 and is smaller than 0.5, wherein R5i is the curvature radius of the image side surface of the fifth lens; r6o is the radius of curvature of the sixth lens object-side surface.
5. The fixed focus optical system of any one of claims 1-4, wherein: the seventh lens is provided with a light filter at the rear.
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| CN201810611770.8A CN108490589B (en) | 2018-06-14 | 2018-06-14 | Fixed-focus optical system |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343202B (en) * | 2018-11-16 | 2021-07-13 | 歌尔光学科技有限公司 | Panoramic lens |
| CN109407279B (en) | 2018-12-12 | 2021-09-14 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
| CN111474673B (en) * | 2019-01-24 | 2021-09-17 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| CN109491056B (en) * | 2019-01-24 | 2021-10-29 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| CN110133828B (en) * | 2019-04-28 | 2021-04-06 | 江西联创电子有限公司 | Fixed focus lens |
| WO2021022524A1 (en) * | 2019-08-07 | 2021-02-11 | 南昌欧菲精密光学制品有限公司 | Optical system, lens module and electronic equipment |
| CN112987230A (en) * | 2019-12-02 | 2021-06-18 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN110989148B (en) * | 2019-12-18 | 2021-10-08 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
| WO2021128121A1 (en) * | 2019-12-26 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN113900221A (en) * | 2021-09-03 | 2022-01-07 | 浙江大华技术股份有限公司 | Optical lens |
| CN117369094B (en) * | 2023-12-07 | 2024-03-19 | 联创电子科技股份有限公司 | Optical lens |
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