CN110908097A - Optical lens, camera optical device and vehicle-mounted monitoring camera - Google Patents
Optical lens, camera optical device and vehicle-mounted monitoring camera Download PDFInfo
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- CN110908097A CN110908097A CN201911349981.XA CN201911349981A CN110908097A CN 110908097 A CN110908097 A CN 110908097A CN 201911349981 A CN201911349981 A CN 201911349981A CN 110908097 A CN110908097 A CN 110908097A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 86
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000003384 imaging method Methods 0.000 claims abstract description 24
- 239000011521 glass Substances 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000012905 input function Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012634 optical imaging Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- G02B13/18—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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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Abstract
The invention discloses an optical lens, a camera optical device and a vehicle-mounted monitoring camera, wherein the lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object space to an image space, the first lens has positive focal power, a convex surface of the first lens faces the object space, the second lens has negative focal power, a convex surface of the second lens faces the object space, the third lens has positive focal power, a convex surface of the third lens faces the image space, the fourth lens has positive focal power, a convex surface of the fourth lens faces the image space, and at least one of the second lens, the third lens and the fourth lens is a plastic aspheric lens. The lens can meet the imaging quality requirements of low distortion, low cost, environmental factor interference resistance and high resolution on the premise of keeping the lens to be short and light. Further, by using the imaging optical device of the present invention in an apparatus such as an in-vehicle monitoring camera, a high-quality image input function can be compactly added to the apparatus, and the imaging optical device can be applied to a wide temperature range.
Description
Technical Field
The present invention relates to an optical imaging technology, and more particularly to a glass-plastic hybrid optical lens, an imaging optical device that outputs an image of a subject captured by the optical lens and an imaging element as an electric signal, and a vehicle-mounted surveillance camera equipped with the imaging optical device.
Background
With the continuous development of intelligent safe driving of automobiles, the requirements on the vehicle-mounted monitoring imaging lens are continuously improved. On the premise of keeping the small field of view and high detail resolution capability of the lens, and the lens is short, short and light, the requirements on the production cost of the lens, the reduction degree of the monitoring fact, environmental interference resistance and other factors are higher and higher. At present, in only small-field monitoring lenses, a full-glass structure is mostly adopted, and 4 to 6 lenses are needed to be used at a 60-degree visual angle in order to correct imaging distortion and system aberration, so that the production and manufacturing cost of the lenses is greatly increased.
Disclosure of Invention
The invention aims to provide an optical lens, an imaging optical device and a vehicle-mounted monitoring camera, which have the advantages of small distortion, low cost and environmental factor interference resistance on the premise of keeping the lens to be short and light.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of the present invention, there is provided an optical lens including a first lens, a second lens, a third lens and a fourth lens arranged in order from an object side to an image side, the first lens having positive power with a convex surface facing the object side, the second lens having negative power with a convex surface facing the object side, the third lens having positive power with a convex surface facing the image side, the fourth lens having positive power with a convex surface facing the image side, at least one of the second lens, the third lens and the fourth lens being a plastic aspheric lens.
In an embodiment, the first lens and the third lens of the optical lens are glass spherical lenses, and the second lens and the fourth lens are plastic aspheric lenses.
In one embodiment, the first lens of the optical lens satisfies 3 < F1/F < 5, F1 is the first lens focal length value, and F is the overall focal length value of the optical lens.
In one embodiment, the first lens element of the optical lens satisfies 0.6 < r1/r2 < 0.8, r1 is a first lens element object side curvature radius value, and r2 is a first lens element image side curvature radius value.
In one embodiment, the second lens element of the optical lens assembly satisfies the relationship of 2.0 < r3/r4 < 3.5, r3 is the object-side curvature radius value of the second lens element, and r4 is the image-side curvature radius value of the second lens element.
In one embodiment, the third lens of the optical lens satisfies F3/F < 2, F3 is the focal length of the third lens, and F is the overall focal length of the optical lens.
In one embodiment, the fourth lens of the optical lens satisfies 1.0 < F4/F < 2.0, F4 is a focal length of the fourth lens, and F is an overall focal length of the optical lens.
In an embodiment, the optical lens further includes a diaphragm, and the diaphragm is located between any two adjacent lenses.
According to another aspect of the present invention, there is also provided an imaging optical apparatus including any one of the above optical lenses and an imaging device that converts an optical image formed by the optical lens into an electric signal, the optical lens being provided so as to form an optical image of a subject on an imaging surface of the imaging device.
According to still another aspect of the present invention, there is also provided an in-vehicle monitoring camera having the above-described image pickup optical device, to which at least one of still image pickup and moving image pickup of a subject is attached.
The embodiment of the invention has the beneficial effects that: by adopting the structure of the invention, the imaging quality requirements of low distortion, low cost, environmental factor interference resistance and high resolution can be met on the premise of keeping the small view field and higher detail resolution capability of the lens and the lens to be short and light. Further, when the imaging optical device of the present invention is used in an apparatus such as an in-vehicle monitoring camera, a high-quality image input function can be compactly added to the apparatus, and the imaging optical device is applicable to a wide temperature range.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
Fig. 1 is a schematic structural diagram of an optical lens of the present invention, wherein the left side of fig. 1 is an object space, and the right side of fig. 1 is an image space;
FIG. 2 is a graph of MTF at 25 ℃ for an embodiment of the present invention;
FIG. 3 is a defocus plot at 25 ℃ for an embodiment of the present invention;
FIG. 4 is a defocus plot at-40 ℃ for an embodiment of the present invention;
FIG. 5 is a graph of defocus at 85 ℃ in accordance with an embodiment of the present invention;
FIG. 6 is a graph of field curvature and distortion curves for an embodiment of the present invention.
Detailed Description
The optical lens, the image pickup optical apparatus, the digital device, and the like according to the present invention will be described below with reference to the accompanying drawings and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
Fig. 1 is a schematic structural diagram of an optical lens according to the present invention, wherein the left side of fig. 1 is an object space, and the right side of fig. 1 is an image space; as shown in fig. 1, the present invention discloses an optical lens, which includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, which are sequentially disposed from an object side to an image side, wherein the first lens L1 has positive focal power and a convex surface facing the object side, the second lens L2 has negative focal power and a convex surface facing the object side, the third lens L3 has positive focal power and a convex surface facing the image side, the fourth lens L4 has positive focal power and a convex surface facing the image side, and at least one of the second lens L2, the third lens L3, and the fourth lens L4 is a plastic aspheric lens. Because the plastic aspheric lens has a larger optimized space, compared with the full glass structure in the prior art, the lens structure can be more compact. By arranging at least one aspheric surface, distortion can be effectively controlled, and the imaging picture has high reduction degree and small distortion.
In the present embodiment, the first lens L1 and the third lens L3 are glass spherical lenses, and the second lens L2 and the fourth lens L4 are plastic aspherical lenses.
The following conditions are preferably satisfied: the first lens L1 satisfies the relationship 3 < F1/F < 5, F1 is the focal length of the first lens, and F is the overall focal length of the optical lens. The first lens element L1 satisfies the relation 0.6 < r1/r2 < 0.8, r1 is the first lens element side curvature radius value, and r2 is the first lens element image side curvature radius value. The second lens element L2 satisfies the relation 2.0 < r3/r4 < 3.5, r3 is the second lens element side curvature radius value, and r4 is the second lens element image side curvature radius value. The third lens L3 satisfies F3/F < 2, F3 is the focal length of the third lens, and F is the overall focal length of the optical lens. The fourth lens L4 satisfies the relationship F4/F < 2.0, F4 is the focal length of the fourth lens, and F is the overall focal length of the optical lens.
By reasonably distributing the focal power according to the conditions, the lens can be applicable to a wider temperature range, and the optical imaging performance is stable; in addition, the ghost can be effectively controlled, and the imaging quality requirement of the monitoring lens is met. In addition, the optical lens also comprises a diaphragm, and the diaphragm is positioned between any two adjacent lenses. The diaphragm STOP is located between the second lens L2 and the third lens L3 in this embodiment.
In the present embodiment, the respective optical parameters are as follows:
when the radii of curvature of the surfaces of the stop, color filter and cover glass in the above table are Infinity, this surface is indicated as a plane.
In this embodiment, the effective focal length F of the optical lens is 3.5; f-number FNO is 2.0; total field angle FOV is 64 °; optical distortion 1.2%; the total length TTL of the optical lens is 11.4 mm;
each aspherical surface shape is described as follows:
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, F, G, H is an aspheric high-order coefficient.
The aspheric surfaces S3, S4, S8 and S9 have the following parameters:
| number of noodles | k | A | B | c | D | E | F | G | H |
| S3 | -5.918 | 0.044 | -0.035 | 0.043 | -0.036 | 0.018 | -5.433e-3 | 8.799e-4 | -5.972e-5 |
| S4 | -0.731 | 0.121 | -0.293 | 1.312 | -3.259 | 4.91 | -4.368 | 2.114 | -0.427 |
| S8 | -2.411 | 0.011 | -0.042 | 0.06 | -0.046 | 0.021 | -6.654e-3 | 1.408e-3 | -1.52e-4 |
| S9 | -0.426 | 0.013 | -1.815e-4 | -3.925e-3 | 5.453e-3 | -2.599e-3 | 4.844e-4 | -3.268e-7 | -6.78e-6 |
Fig. 2 is a MTF resolution graph of the optical lens of this embodiment, which represents a comprehensive resolution level of an optical system with an object distance at infinity, where the abscissa represents spatial frequency, the unit lp/mm, the ordinate represents contrast, and TS0.00(deg) represents a resolution contrast that can be achieved by the 0 ° field angle T, the T meridian direction S sagittal direction;
FIG. 3 is a defocus plot of the optical lens of FIG. 1 in a 25 ℃ environment, where different curves represent different fields of view; FIG. 4 is a defocus plot of the central field of view (0,0) of the optical lens of FIG. 1 in a-40 ℃ environment; FIG. 5 is a defocus plot of the central field of view (0,0) of the optical lens of FIG. 1 in an 85 ℃ environment; FIGS. 3 to 5 are all represented by the wavelength of an infrared 940nm wave band in unit mm, wherein the abscissa represents the defocus amount, and TS0.00(deg) represents the resolution contrast ratio which can be achieved by a 0-degree view angle T in the meridian direction S sagittal direction;
as shown in fig. 2 and 3, the MTF of the central (0,0) field can approach 0.78 at the resolution frequency of 83lp/mm and the ambient temperature of 25 ℃, and the concentration of the defocus curve is high and the resolution is high. As shown in fig. 4 and 5, the resolution frequency is 83lp/mm, the ambient temperatures are-40 ℃ and 85 ℃, and the offset of the optical focal plane of the central (0,0) view field relative to the central (0,0) view field in the room temperature state (25 ℃) can be controlled within 10um, which indicates that the glass-plastic hybrid monitoring lens can adapt to wider ambient temperatures and has high optical performance and temperature stability.
Fig. 6 is a graph of field curvature and distortion of the present embodiment, which is represented by an infrared 940nm band, where the unit of field curvature is mm, the unit of distortion is%, and the left graph in fig. 6 has an abscissa of defocus and an ordinate of normalized field of view. The right graph, the abscissa is the percentage distortion and the ordinate is the normalized field of view. As can be seen from fig. 6, the optical lens of the present invention has a small distortion, and the amount of distortion can be controlled within 3%.
The present invention also discloses, as an application of the optical lens described above, an imaging optical apparatus including the optical lens described in any of the above embodiments and an imaging device that converts an optical image formed by the optical lens into an electric signal, the optical lens being provided so as to form an optical image of a subject on an imaging surface of the imaging device. The photographic optical device has the advantages of low production cost, high reduction degree of monitoring facts and strong environmental interference resistance on the premise of keeping the small view field of the lens and high detail resolution capability and the short, small and light lens.
The vehicle-mounted monitoring camera provided with the camera optical device is also within the disclosure and protection scope of the invention. As will be readily understood by those skilled in the art, the optical lens and the imaging optical device described above can be applied to other apparatuses including digital cameras, video cameras, surveillance cameras, cameras for video phones, endoscopes, and the like, as well as cameras built in or externally connected to personal computers, digital apparatuses (for example, small and portable information apparatus terminals such as mobile phones and notebook computers), peripheral apparatuses (scanners, printers, and the like) of these apparatuses, other digital apparatuses, and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only a preferred example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. An optical lens, characterized in that: including first lens, second lens, third lens and the fourth lens that set gradually from the object space to the image space, first lens has positive focal power and convex surface towards the object space, the second lens has negative focal power and convex surface towards the object space, the third lens has positive focal power and convex surface towards the image space, the fourth lens has positive focal power and convex surface towards the image space, at least one is plastic aspheric lens in second lens, third lens and the fourth lens.
2. An optical lens according to claim 1, characterized in that: the first lens and the third lens are glass spherical lenses, and the second lens and the fourth lens are plastic aspheric lenses.
3. An optical lens according to claim 2, characterized in that: the first lens meets the requirement that F1/F is more than 3 and less than 5, F1 is the focal length value of the first lens, and F is the integral focal length value of the optical lens.
4. An optical lens according to claim 3, characterized in that: the first lens satisfies 0.6 < r1/r2 < 0.8, r1 is a first lens object side curvature radius value, and r2 is a first lens object side curvature radius value.
5. An optical lens according to claim 4, characterized in that: the second lens satisfies 2.0 < r3/r4 < 3.5, r3 is a second lens object side curvature radius value, and r4 is a second lens image side curvature radius value.
6. An optical lens according to claim 5, characterized in that: the third lens meets the condition that F3/F is less than 2, F3 is the focal length value of the third lens, and F is the integral focal length value of the optical lens.
7. An optical lens according to claim 6, characterized in that: the fourth lens meets the condition that F4/F is more than 1.0 and less than 2.0, F4 is the focal length value of the fourth lens, and F is the integral focal length value of the optical lens.
8. An optical lens according to claim 1, characterized in that: the lens structure further comprises a diaphragm, and the diaphragm is located between any two adjacent lenses.
9. An imaging optical device, characterized in that: the optical lens according to any one of claims 1 to 8, which is provided with an optical lens and an image pickup device for converting an optical image formed by the optical lens into an electric signal, wherein the optical lens is arranged so that an optical image of a subject is formed on an image pickup surface of the image pickup device.
10. The utility model provides a vehicle-mounted monitoring camera which characterized in that: an image pickup optical apparatus according to claim 9 is provided so as to add at least one of a still image pickup function and a moving image pickup function of a subject.
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| CN201911349981.XA CN110908097B (en) | 2019-12-24 | 2019-12-24 | Optical lens, photographing optical device and vehicle-mounted monitoring camera |
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| CN201911349981.XA CN110908097B (en) | 2019-12-24 | 2019-12-24 | Optical lens, photographing optical device and vehicle-mounted monitoring camera |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009494A (en) * | 2021-02-22 | 2021-06-22 | 曜芯科技有限公司 | Depth detection device and electronic equipment |
| CN113671663A (en) * | 2020-05-13 | 2021-11-19 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN116009220A (en) * | 2023-03-24 | 2023-04-25 | 联创电子科技股份有限公司 | Optical lens and camera module |
| US11940597B2 (en) | 2021-02-01 | 2024-03-26 | Largan Precision Co., Ltd. | Image capturing optical lens system, imaging apparatus and electronic device |
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| JPH09281388A (en) * | 1996-04-15 | 1997-10-31 | Olympus Optical Co Ltd | Lens system |
| CN209044164U (en) * | 2018-12-03 | 2019-06-28 | 福州宏旭科技有限公司 | A kind of linear array scanning camera lens for industrial camera |
| CN109960006A (en) * | 2017-12-22 | 2019-07-02 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| RU193226U1 (en) * | 2019-07-29 | 2019-10-17 | Акционерное общество "ЛОМО" | ATHERMALIZED LENS FOR THE INFRARED SPECTRUM |
| CN211086779U (en) * | 2019-12-24 | 2020-07-24 | 协益电子（苏州）有限公司 | Optical lens, camera optical device and vehicle-mounted monitoring camera |
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2019
- 2019-12-24 CN CN201911349981.XA patent/CN110908097B/en active Active
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| JPH09281388A (en) * | 1996-04-15 | 1997-10-31 | Olympus Optical Co Ltd | Lens system |
| CN109960006A (en) * | 2017-12-22 | 2019-07-02 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN209044164U (en) * | 2018-12-03 | 2019-06-28 | 福州宏旭科技有限公司 | A kind of linear array scanning camera lens for industrial camera |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671663A (en) * | 2020-05-13 | 2021-11-19 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN113671663B (en) * | 2020-05-13 | 2022-09-09 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| US11940597B2 (en) | 2021-02-01 | 2024-03-26 | Largan Precision Co., Ltd. | Image capturing optical lens system, imaging apparatus and electronic device |
| CN113009494A (en) * | 2021-02-22 | 2021-06-22 | 曜芯科技有限公司 | Depth detection device and electronic equipment |
| CN116009220A (en) * | 2023-03-24 | 2023-04-25 | 联创电子科技股份有限公司 | Optical lens and camera module |
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| CN110908097B (en) | 2024-08-23 |
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