CN114815161A - Ultra-wide-angle vehicle-mounted lens - Google Patents

Ultra-wide-angle vehicle-mounted lens Download PDF

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Publication number
CN114815161A
CN114815161A CN202210496724.4A CN202210496724A CN114815161A CN 114815161 A CN114815161 A CN 114815161A CN 202210496724 A CN202210496724 A CN 202210496724A CN 114815161 A CN114815161 A CN 114815161A
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Prior art keywords
lens
object side
ultra
wide
focal power
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王迪
王晓飞
金兑映
李爽
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Liaoning Zhonglan Photoelectric Technology Co Ltd
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Liaoning Zhonglan Photoelectric Technology Co Ltd
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Priority to CN202210496724.4A priority Critical patent/CN114815161A/en
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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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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

Abstract

The invention relates to the technical field of optical lenses, in particular to an ultra-wide-angle vehicle-mounted lens. The lens comprises a front lens group with positive focal power, a diaphragm and a rear lens group with positive focal power in sequence from an object side to an image side along an optical axis; the front lens group comprises a first lens, a second lens and a third lens from an object side to an image side in sequence; the focal power of the first lens is negative, 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 focal power of the second lens is negative, and the object side surface and the image side surface of the second lens are both concave surfaces; the focal power of the third lens is positive, and the object side surface and the image side surface of the third lens are convex surfaces; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens from the object side to the image side in sequence; the focal power of the fourth lens is positive, and the object side surface and the image side surface of the fourth lens are convex surfaces; the focal power of the fifth lens is negative, and the object side surface and the image side surface of the fifth lens are both concave surfaces; the sixth lens has positive focal power and convex object-side and image-side surfaces. The invention can make the lens have miniaturization, large wide angle and high quality imaging.

Description

Ultra-wide-angle vehicle-mounted lens
Technical Field
The invention relates to the technical field of optical lenses, in particular to an ultra-wide-angle vehicle-mounted lens.
Background
In recent years, with the increasing requirements of the country on road traffic safety and automobile safety and the rise of future unmanned technology, the vehicle-mounted lens becomes an increasingly indispensable important part on the automobile, and meanwhile, the automobile field also puts forward an increasing quality requirement on the vehicle-mounted lens. The traditional vehicle-mounted lens has the defects that the number of the small lens of the aperture is large, the glass lens is adopted mostly, the field angle of the lens is small usually, the size is large, the price is high, the overall effect is poor, and the requirement of the existing market is difficult to meet.
Disclosure of Invention
In view of the above disadvantages and shortcomings of the prior art, the present invention provides an ultra-wide angle vehicular lens, which solves the problems of small field angle and large volume in the prior art.
In order to achieve the purpose, the invention adopts the main technical scheme that:
the embodiment of the invention provides a super-wide-angle vehicle-mounted lens, which sequentially comprises a front lens group with positive focal power, a diaphragm and a rear lens group with positive focal power from an object side to an image side along an optical axis; the front lens group comprises a first lens, a second lens and a third lens from an object side to an image side in sequence; the focal power of the first lens is negative, 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 focal power of the second lens is negative, and the object side surface and the image side surface of the second lens are both concave surfaces; the focal power of the third lens is positive, and the object side surface and the image side surface of the third lens are convex surfaces; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens from the object side to the image side in sequence; the focal power of the fourth lens is positive, and the object side surface and the image side surface of the fourth lens are convex surfaces; the focal power of the fifth lens is negative, and the object side surface and the image side surface of the fifth lens are both concave surfaces; the focal power of the sixth lens is positive, and the object side surface and the image side surface of the sixth lens are convex surfaces; the first lens and the third lens are both glass spherical lenses, the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses, and the lens meets the conditional expression: 0.8< EFLF/EFLB < 2.0; and EFLB is the focal length of the rear lens group of the optical system. After the condition formula is met, the ratio between the combined focal length of the front lens group and the combined focal length of the rear lens group is controlled, so that light can enter the rear lens group smoothly from the front lens group, and the optical system is guaranteed to have a good imaging effect.
Further, the refractive index and the abbe number of the first lens and the third lens respectively satisfy the following conditions: nd1>1.8, vd1<46.5, nd3>1.8, vd3< 41.5; where nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens, nd3 is the refractive index of the third lens, and vd3 is the Abbe number of the third lens. After the conditions are met, the respective refractive index and dispersion coefficient of the first lens and the third lens are reasonably controlled, so that the chromatic aberration of the optical system is favorably improved, the optical system can clearly image, and the size is favorably reduced.
Further, the first lens satisfies the following conditional expression: 1.8< | D1/f1 | < 2.2; wherein D1 is the effective aperture of the object side of the first lens, and f1 is the effective focal length of the first lens. After the condition expression is satisfied, the light can be made to enter the object side surface of the first lens at the maximum incidence angle, and the wide angle of the optical system can be better realized.
Further, the lens satisfies the following conditional expression: FOV >180 °; wherein the FOV is the total field angle of the lens. The optical system can capture graphical information and image well over a range of viewing angles over 180 degrees.
Further, the lens satisfies the following conditional expression: 8.6< TTL/F < 8.7; wherein, TTL is the total length of the lens, and F is the total focal length of the lens. The optical system can be miniaturized by satisfying the conditional expressions.
Further, the lens satisfies the following conditional expression: 0.2< d6/TTL < 0.25; d6 is the distance between the image side surface of the sixth lens element and the image plane on the optical axis, and TTL is the total length of the lens barrel. After the condition formula is satisfied, the module assembly is facilitated, the total length of the optical system is shortened, and the structure is more compact.
Further, the lens satisfies the following conditional expression: 0.26< (R7+ R9)/(R7-R9) < 0.35; wherein R7 is the fourth lens object side radius of curvature and R9 is the fifth lens object side radius of curvature. When the conditional expressions are satisfied, the aberration of the optical system can be corrected.
Further, the lens satisfies the following conditional expression: 2.5< | f4/f5 | < 2.7; wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. After the condition formula is satisfied, the influence of the temperature drift on the optical system can be effectively improved.
Further, the second lens, the fourth lens, the fifth lens and the sixth lens satisfy an aspherical lens formula in which aspherical coefficients satisfy the following equations:
Z＝cy 2 /[1+{1－(1+k)c 2 y 2 } 1/2 ]+A4y 4 +A6y 6 +A8y 8 +A10y 10 +A12y 12 +A14y 14 +A16y 16
wherein Z is an aspheric sagittal height, c is an aspheric paraxial curvature, y is a lens aperture, k is a conic coefficient, a4 is a 4-th aspheric coefficient, a6 is a 6-th aspheric coefficient, A8 is an 8-th aspheric coefficient, a10 is a 10-th aspheric coefficient, a12 is a 12-th aspheric coefficient, a14 is a 14-th aspheric coefficient, and a16 is a 16-th aspheric coefficient. After the expression is satisfied, the aberration correction capability which cannot be achieved by the traditional spherical lens can be achieved, and the shooting effect of the lens is improved.
The beneficial effects of the invention are: the ultra-wide-angle vehicle-mounted lens mainly comprises six lenses, adopts the mixed design of a glass spherical lens and a plastic non-spherical lens, and reasonably distributes parameters by matching reasonable focal power and surface type, so that the lens has the advantages of miniaturization, large wide angle and high-quality imaging.
Drawings
Fig. 1 shows a schematic structural diagram of an ultra-wide angle vehicular lens according to embodiment 1 of the present invention;
FIG. 2 is a distortion graph of the ultra-wide angle vehicular lens of embodiment 1 of the present invention;
fig. 3 shows MTF graphs of the ultra-wide angle vehicular lens of embodiment 1 of the present invention;
fig. 4 shows a schematic structural diagram of an ultra-wide angle vehicular lens according to embodiment 2 of the present invention;
FIG. 5 is a distortion graph of the ultra-wide angle vehicular lens of embodiment 2 of the present invention;
fig. 6 shows MTF graphs of the ultra-wide angle in-vehicle lens according to embodiment 2 of the present invention.
In the figure: the lens system comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a first lens object side S1, a first lens image side S2, a second lens object side S3, a second lens image side S4, a third lens object side S5, a third lens image side S6, a diaphragm S7, a fourth lens object side S8, a fourth lens image side S9, a fifth lens object side S10, a fifth lens image side S11, a sixth lens object side S12, a sixth lens image side S13 and a filter I8.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the present embodiment provides an ultra-wide angle in-vehicle lens. The optical lens includes, in order from the object side to the image side along the optical axis, a front lens group having positive power, a diaphragm S7, and a rear lens group having positive power. The front lens group includes, in order from the object side to the image side, a first lens L1, a second lens L2, and a third lens L3. The first lens element L1 has negative power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, a concave object-side surface S3 and a concave image-side surface S4. The third lens element L3 has positive power, a convex object-side surface S5 and a convex image-side surface S6. The rear lens group includes, in order from the object side to the image side, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The fourth lens element L4 has positive power, a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has negative power, a concave object-side surface S10, and a concave image-side surface S11. The sixth lens element L6 has positive power, a convex object-side surface S12 and a convex image-side surface S13. The lens further comprises a filter I8, and a filter I8 is arranged between the sixth lens L6 and an image plane.
Specifically, the first lens L1 and the third lens L3 are all glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastic aspheric lenses.
Table one (a) shows the surface type, radius of curvature, thickness, and material of each lens of the ultra-wide angle vehicular lens of example 1. Wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
The design parameters of the lens assembly of this embodiment 1 refer to the following table:
watch I (a)
Figure BDA0003633070670000041
Figure BDA0003633070670000051
Watch 1 (b)
Figure BDA0003633070670000052
In this embodiment 1, the specific parameters of the lens are shown in the following table:
watch 1 (c)
Figure BDA0003633070670000053
The structural features of the optical system are shown in table one (a), table one (b) and fig. 1.
The lens shown in embodiment 1 has a large aperture and a small volume.
According to the distortion curves of the optical system shown in table one (c) and fig. 2, and the MTF curve of the optical system shown in fig. 3, the lens shown in embodiment 1 can achieve good imaging.
Example 2
As shown in fig. 5, the present embodiment provides an ultra-wide angle in-vehicle lens. The optical lens includes, in order from the object side to the image side along the optical axis, a front lens group having positive power, a diaphragm S7, and a rear lens group having positive power. The front lens group includes, in order from the object side to the image side, a first lens L1, a second lens L2, and a third lens L3. The first lens element L1 has negative power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has negative power, a concave object-side surface S3 and a concave image-side surface S4. The third lens element L3 has positive power, a convex object-side surface S5 and a convex image-side surface S6. The rear lens group includes, in order from the object side to the image side, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The fourth lens element L4 has positive power, a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has negative power, a concave object-side surface S10, and a concave image-side surface S11. The sixth lens element L6 has positive power, a convex object-side surface S12 and a convex image-side surface S13. The lens further comprises a filter I8, and a filter I8 is arranged between the sixth lens L6 and an image plane.
Specifically, the first lens L1 and the third lens L3 are all glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastic aspheric lenses.
Table two (a) shows the surface type, radius of curvature, thickness and material of each lens of the ultra-wide angle in-vehicle lens of example 2. Wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
The design parameters of the lens in this embodiment 2 refer to the following table:
watch two (a)
Figure BDA0003633070670000061
Figure BDA0003633070670000071
Watch two (b)
Figure BDA0003633070670000072
In this embodiment 2, the specific parameters of the lens are shown in the following table:
watch two (c)
Figure BDA0003633070670000073
The structural features of the optical system are shown in table two (a), table two (b) and fig. 4. The lens shown in embodiment 2 has a large aperture and a small volume.
The lens shown in embodiment 2 can achieve good imaging according to the distortion curves of the optical system shown in table two (c) and fig. 5, and the MTF curve of the optical system shown in fig. 6.

Claims (9)

1. The ultra-wide-angle vehicle-mounted lens is characterized by comprising a front lens group with positive focal power, a diaphragm and a rear lens group with positive focal power in sequence from an object side to an image side along an optical axis; the front lens group comprises a first lens, a second lens and a third lens from an object side to an image side in sequence; the focal power of the first lens is negative, 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 focal power of the second lens is negative, and the object side surface and the image side surface of the second lens are both concave surfaces; the focal power of the third lens is positive, and the object side surface and the image side surface of the third lens are convex surfaces; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens from the object side to the image side in sequence; the focal power of the fourth lens is positive, and the object-side surface and the image-side surface of the fourth lens are convex surfaces; the focal power of the fifth lens is negative, and the object side surface and the image side surface of the fifth lens are both concave surfaces; the focal power of the sixth lens is positive, and the object side surface and the image side surface of the sixth lens are convex surfaces;
the first lens and the third lens are both glass spherical lenses, the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses, and the lens meets the conditional expression: 0.8< EFLF/EFLB < 2.0; and EFLB is the focal length of the rear lens group of the optical system.
2. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the refractive index and the dispersion coefficient of the first lens and the third lens respectively satisfy the following conditions: nd1>1.8, vd1<46.5, nd3>1.8, vd3< 41.5; where nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens, nd3 is the refractive index of the third lens, and vd3 is the Abbe number of the third lens.
3. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the first lens satisfies the following conditional expression: 1.8< | D1/f1 | < 2.2; wherein D1 is the effective aperture of the object side of the first lens, and f1 is the effective focal length of the first lens.
4. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the lens satisfies the following conditional expressions: FOV >180 °; wherein the FOV is the total field angle of the lens.
5. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the lens satisfies the following conditional expression: 8.6< TTL/F < 8.7; wherein, TTL is the total length of the lens, and F is the total focal length of the lens.
6. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the lens satisfies the following conditional expression: 0.2< d6/TTL < 0.25; and d6 is the distance between the image side surface of the sixth lens element and the imaging surface on the optical axis, and TTL is the total length of the lens barrel.
7. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the lens satisfies the following conditional expression: 0.26< (R7+ R9)/(R7-R9) < 0.35; wherein R7 is the fourth lens object side radius of curvature and R9 is the fifth lens object side radius of curvature.
8. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the lens satisfies the following conditional expression: 2.5< | f4/f5 | < 2.7; wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.
9. The ultra-wide-angle vehicular lens according to claim 1, characterized in that: the second lens, the fourth lens, the fifth lens and the sixth lens satisfy an aspheric lens formula, wherein aspheric coefficients satisfy the following equation:
Z＝cy 2 /[1+{1－(1+k)c 2 y 2 } 1/2 ]+A4y 4 +A6y 6 +A8y 8 +A10y 10 +A12y 12 +A14y 14 +A16y 16
wherein Z is an aspheric sagittal height, c is an aspheric paraxial curvature, y is a lens aperture, k is a conic coefficient, a4 is a 4-th aspheric coefficient, a6 is a 6-th aspheric coefficient, A8 is an 8-th aspheric coefficient, a10 is a 10-th aspheric coefficient, a12 is a 12-th aspheric coefficient, a14 is a 14-th aspheric coefficient, and a16 is a 16-th aspheric coefficient.
CN202210496724.4A 2022-05-09 2022-05-09 Ultra-wide-angle vehicle-mounted lens Pending CN114815161A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007279632A (en) * 2006-04-12 2007-10-25 Matsushita Electric Ind Co Ltd Super wide angle lens
CN107741625A (en) * 2017-10-12 2018-02-27 深圳市特莱斯光学有限公司 A kind of low-cost and high-performance drive recorder camera lens
CN215642023U (en) * 2021-01-05 2022-01-25 协益电子（苏州）有限公司 Vehicle-mounted optical lens
CN114217416A (en) * 2021-12-28 2022-03-22 江西联创电子有限公司 Optical lens
CN114326049A (en) * 2022-02-22 2022-04-12 浙江舜宇光学有限公司 Fisheye image capturing lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007279632A (en) * 2006-04-12 2007-10-25 Matsushita Electric Ind Co Ltd Super wide angle lens
CN107741625A (en) * 2017-10-12 2018-02-27 深圳市特莱斯光学有限公司 A kind of low-cost and high-performance drive recorder camera lens
CN215642023U (en) * 2021-01-05 2022-01-25 协益电子（苏州）有限公司 Vehicle-mounted optical lens
CN114217416A (en) * 2021-12-28 2022-03-22 江西联创电子有限公司 Optical lens
CN114326049A (en) * 2022-02-22 2022-04-12 浙江舜宇光学有限公司 Fisheye image capturing lens

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