CN113031190A - Vehicle-mounted monitoring optical lens - Google Patents
Vehicle-mounted monitoring optical lens Download PDFInfo
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- CN113031190A CN113031190A CN202110262174.5A CN202110262174A CN113031190A CN 113031190 A CN113031190 A CN 113031190A CN 202110262174 A CN202110262174 A CN 202110262174A CN 113031190 A CN113031190 A CN 113031190A
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- lens
- focal length
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- vehicle
- monitoring optical
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- 230000003287 optical effect Effects 0.000 title claims abstract description 66
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 230000007613 environmental effect Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 230000005499 meniscus Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides a vehicle-mounted monitoring optical lens, which comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens are arranged in sequence from an object space to an image space; the first lens has negative focal power, and the object side surface of the first lens is any one of a convex surface and a concave surface; the second lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power, and the third lens and the fourth lens are combined into a cemented lens; the fifth lens has positive focal power and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power and an object side surface of the sixth lens is a convex surface; the method can overcome the defocusing and image surface blurring of the lens caused by the change of the environmental temperature, and can keep high resolution in a very wide range of the change of the environmental temperature.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a vehicle-mounted monitoring optical lens.
Background
With the continuous development of intelligent safe driving of automobiles, the requirements on the vehicle-mounted monitoring optical lens are continuously improved. On the premise of keeping high resolution, large aperture and light weight of the lens, the requirement on the stability of the lens under different environmental temperatures is higher and higher.
In the current vehicle-mounted monitoring lens, although the glass-plastic hybrid architecture can achieve low cost and miniaturization, the vehicle-mounted monitoring lens is out of focus and the image plane is blurred due to the fact that plastic has a large thermal expansion coefficient and the change of the environmental temperature causes the problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a vehicle-mounted monitoring optical lens which can overcome the defocusing and image plane blurring of the lens caused by the change of the environmental temperature and keep high resolution in a very wide range of the change of the environmental temperature.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a vehicle-mounted monitoring optical lens, which comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens are arranged in sequence from an object space to an image space;
the first lens has negative focal power, and the object side surface of the first lens is any one of a convex surface and a concave surface;
the second lens has positive optical power;
the third lens has positive focal power, and the dn/dt < -6X10 of the third lens-6Vd > 45 of the third lens, wherein dn/dt refers to the temperature coefficient of the refractive index of the lens, and Vd refers to the Abbe number of the lens;
the fourth lens has negative focal power, and the third lens and the fourth lens are combined into a cemented lens;
the fifth lens has positive focal power and the image side surface of the fifth lens is a convex surface;
the sixth lens has positive focal power and has a convex object side surface.
The invention provides a vehicle-mounted monitoring optical lens which can overcome the defocusing and image plane blurring of the lens caused by the change of environmental temperature and keep high resolution in a very wide range of the change of the environmental temperature.
As a preferable technical scheme, the first lens meets the condition that 0.8 < | F1/F | < 1.5, F1 is the focal length value of the first lens, and F is the focal length value of the whole optical system.
As a preferable technical scheme, the second lens meets the condition that 0.8 < | F2/F | < 1.5, F2 is the focal length value of the second lens, and F is the integral focal length value of the optical system.
Preferably, the difference between abbe numbers V3 and V4 of the two cemented lenses of the third lens and the fourth lens satisfies: 30 < | V3-V4| < 55.
Preferably, the third lens satisfies 0.8 < | F3/F | < 1.5, F3 is the focal length of the third lens, and F is the focal length of the whole optical system.
Preferably, the fourth lens satisfies 0.75 < | F4/F | < 1.5, F4 is the focal length of the fourth lens, and F is the focal length of the whole optical system.
Preferably, the fifth lens satisfies 0.8 < | F5/F | < 1.5, F5 is the focal length of the fifth lens, and F is the focal length of the whole optical system.
Preferably, the Nd of the fifth lens is more than 1.75, and the Vd of the fifth lens is less than 45, wherein Nd refers to the refractive index of the lens, and Vd refers to the Abbe number of the lens.
Preferably, the sixth lens satisfies | F6/F | ≧ 2.2, F6 is the focal length of the sixth lens, and F is the focal length of the entire optical system.
Preferably, the Nd of the sixth lens is more than 1.75, and the Vd of the sixth lens is less than 45, wherein Nd is the refractive index of the lens, and Vd is the Abbe number of the lens.
Drawings
FIG. 1 is a block diagram of a vehicle-mounted monitoring optical lens according to the present invention;
FIG. 2 is a distortion curve diagram of an imaging lens of the present invention;
FIG. 3 is a defocus plot of the present invention at-40 ℃ for a central field of view of 56 lp/mm;
FIG. 4 is a defocus plot of the present invention at 20 ℃ with a central field of view of 56 lp/mm;
FIG. 5 is a defocus plot of the present invention at 85 ℃ for a central field of view of 56 lp/mm.
Wherein: 1-a first lens, 2-a second lens, 3-a diaphragm, 4-a third lens, 5-a fourth lens, 6-a fifth lens, 7-a shading sheet, 8-a sixth lens, 9-a light filter and 10-protective glass.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings
In order to achieve the object of the present invention, the present invention provides a vehicle-mounted monitoring optical lens, preferably a six-piece optical lens, the six-piece optical lens including: the vehicle-mounted monitoring optical lens has the advantages of being good in stability, simple in structure, low in cost and small in size.
As shown in fig. 1, a vehicle-mounted monitoring optical lens is provided with a first lens 1, a second lens 2, a diaphragm 3, a third lens 4, a fourth lens 5, a fifth lens 6, a light shielding sheet 7, a sixth lens 8, a light filter 9, a protective glass 10 and an IMA mirror in sequence from an object side to an image side, wherein the first lens 1 is a double-concave lens with a concave object side and a concave image side; the second lens element 2 is a biconvex lens element having a convex object surface side and a convex image surface side; the third lens 4 is a biconvex lens having a convex object surface side and a convex image surface side; the fourth lens 5 is a biconcave lens having a concave object surface side and a concave image surface side; the fifth lens element 6 is a meniscus lens element having a concave object surface side and a convex image surface side; the sixth lens element 8 is a meniscus lens element having a convex object surface side and a concave image surface side.
The dn/dt of the third lens 4 is < -6X10-6 ℃, and the Vd of the third lens 4 is more than 45, wherein dn/dt refers to the temperature coefficient of the refractive index of the lens, and Vd refers to the Abbe number of the lens; the temperature coefficient of the refractive index of the third lens 4 satisfies dn/dt < -6X10-6The temperature can be kept high in a very wide range of the change of the ambient temperatureResolution power.
In some embodiments, the first lens 1 satisfies 0.8 < | F1/F | < 1.5, F1 is the first lens focal length value, and F is the optical system overall focal length value.
In some embodiments, the second lens 2 satisfies 0.8 < | F2/F | < 1.5, F2 is the second lens focal length value, and F is the optical system overall focal length value.
In some embodiments, the difference between abbe numbers V3 and V4 of the two cemented lenses of the third lens 4 and the fourth lens 5 satisfies: 30 < | V3-V4| < 55.
In some embodiments, the third lens 4 satisfies 0.8 < | F3/F | < 1.5, F3 is the third lens focal length value, and F is the optical system overall focal length value.
In some embodiments, the fourth lens 5 satisfies 0.75 < | F4/F | < 1.5, F4 is the fourth lens focal length value, and F is the optical system overall focal length value.
In some embodiments, the fifth lens 6 satisfies 0.8 < | F5/F | < 1.5, F5 is the fifth lens focal length value, and F is the optical system overall focal length value.
In some embodiments, the Nd of the fifth lens 6 is > 1.75, and Vd of the fifth lens 6 is < 45, wherein Nd refers to the refractive index of the lens and Vd refers to the abbe number of the lens.
In some embodiments, the sixth lens 8 satisfies | F6/F | ≧ 2.2, F6 is the sixth lens focal length value, and F is the optical system overall focal length value.
In some embodiments, the Nd of the sixth lens 8 is greater than 1.75, and the Vd of the sixth lens 8 is less than 45, wherein Nd refers to the refractive index of the lens, and Vd refers to the abbe number of the lens.
In this embodiment, the two surfaces of the first lens 1 are S1 surfaces and S2 surfaces, the two surfaces of the second lens 2 are S3 surfaces and S4 surfaces, the stop 3 surface is S5 surface, the two surfaces of the third lens 4 are S6 surfaces and S7 surfaces, the two surfaces of the fourth lens 5 are S7 surfaces and S8 surfaces, the two surfaces of the fifth lens 6 are S9 surfaces and S10 surfaces, the light-shielding sheet 7 surface is S11 surface, the two surfaces of the sixth lens 8 are S12 surfaces and S13 surfaces, the two surfaces of the filter 9 are S14 surfaces and S15 surfaces, the two surfaces of the protective glass 10 are S16 surfaces and S17 surfaces, and the one surface of the IMA surface is S18 surface. The specific optical parameters of the vehicle-mounted monitoring optical lens provided by the embodiment of the invention are as follows:
TABLE 1
In table 1, when the curvature radius of the S5 surface of the stop 3, the S11 surface of the light-shielding sheet 7, the S14 surface and the S15 surface of the filter 9, the S16 surface and the S17 surface of the cover glass 10, and the S18 surface of IMA is Infinity, this surface is a plane.
The optical performance of the vehicle-mounted monitoring optical lens provided by the embodiment of the invention is as follows:
TABLE 2
| Parameter(s) | TTL(mm) | F(mm) | D(mm) | h(mm) | FOV(°) | BFL(mm) |
| Numerical value | 20.1 | 1.65 | 3.88 | 6.21 | 74.2 | 6.264 |
The maximum clear aperture D of the diaphragm surface S5 of the diaphragm 3 corresponding to the maximum field angle FOV of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy FOV/h/D of 3.079; the BFL/TTL between the optical back focus BFL of the optical lens and the optical total length TTL of the optical lens is 0.311; and the total optical length TTL of the optical lens, the maximum view field angle FOV of the optical lens and the image height h corresponding to the maximum view field angle of the optical lens satisfy the following conditions: TTL/h/FOV is 0.043; the vehicle-mounted monitoring optical lens has the advantages of simple structure, low cost and miniaturization while keeping high resolution in a very wide range of environmental temperature change.
Fig. 2 is a distortion graph of the imaging lens of the present invention, wherein, as shown in fig. 1 in fig. 2, a field curvature graph is shown, in which the ordinate of the field curvature graph is the field angle, the abscissa is the distance of the image point from the paraxial image plane, T represents the meridional field curvature, and S represents the sagittal field curvature; as shown in fig. 2 (2) which is a distortion curve diagram, the ordinate of the distortion curve diagram is the field angle, and the abscissa is the distortion percentage, it can be observed from fig. 2 that the distortion percentage of the imaging lens of the present invention reaches the standard, and the vehicle-mounted monitoring optical lens maintains high resolution in a very wide range of environmental temperature variation.
Fig. 3, 4 and 5 are defocus graphs of the vehicle-mounted monitoring optical lens at ambient temperatures of-40 ℃, 20 ℃ and 85 ℃, respectively, wherein the abscissa is defocus, the ordinate is contrast, and TS 0.00(deg) represents diffraction curves in the meridional and sagittal directions in the field of view of the image plane 0.00. As can be seen from fig. 3-5, the on-board monitoring optical lens has the advantages of simple structure, low cost and miniaturization while maintaining high resolution in a very wide range of environmental temperature variation
According to the vehicle-mounted monitoring optical lens, the lens adopts the all-glass spherical lens, the glass material of the all-glass spherical lens has high light transmission characteristic, the clear imaging capability can be realized through an MTF curve graph, the track line and the identification information can be effectively captured and distinguished, the stable focusing characteristic and the thermal compensation characteristic can be realized through a defocusing curve graph, the high resolving power can be kept under the change of the environmental temperature, and meanwhile, the requirements of small size, large aperture and light weight of the lens are met.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.
Claims (10)
1. An on-vehicle monitoring optical lens, characterized by comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens are arranged in sequence from an object space to an image space;
the first lens has negative focal power, and the object side surface of the first lens is any one of a convex surface and a concave surface;
the second lens has positive optical power;
the third lens has positive optical power;
the fourth lens has negative focal power, and the third lens and the fourth lens are combined into a cemented lens;
the fifth lens has positive focal power and the image side surface of the fifth lens is a convex surface;
the sixth lens has positive focal power and has a convex object side surface.
2. The vehicle-mounted monitoring optical lens of claim 1, wherein the first lens satisfies 0.8 < | F1/F | < 1.5, F1 is the focal length of the first lens, and F is the focal length of the whole optical system.
3. The vehicular monitoring optical lens of claim 1, wherein the second lens satisfies 0.8 < | F2/F | < 1.5, F2 is the focal length of the second lens, and F is the focal length of the entire optical system.
4. The on-board monitoring optical lens of claim 1, wherein dn/dt < -6X10 of the third lens-6And Vd of the third lens is more than 45 ℃, wherein dn/dt refers to the temperature coefficient of the refractive index of the lens, and Vd refers to the Abbe number of the lens.
5. The vehicular monitoring optical lens according to claim 1, wherein the difference between abbe numbers V3 and V4 of the two cemented lenses of the third lens and the fourth lens satisfies: 30 < | V3-V4| < 55.
6. The vehicular monitoring optical lens of claim 1, wherein the third lens satisfies 0.8 < | F3/F | < 1.5, F3 is the focal length of the third lens, and F is the focal length of the entire optical system.
7. The vehicular monitoring optical lens of claim 1, wherein the fourth lens satisfies 0.75 < | F4/F | < 1.5, F4 is the focal length of the fourth lens, and F is the focal length of the entire optical system.
8. The vehicular monitoring optical lens according to claim 1, wherein the fifth lens satisfies 0.8 < | F5/F | < 1.5, F5 is a focal length value of the fifth lens, and F is an overall focal length value of the optical system.
9. The vehicle-mounted monitoring optical lens according to claim 1 or 8, characterized in that Nd of the fifth lens is more than 1.75, and Vd of the fifth lens is less than 45, wherein Nd is refractive index of the lens, and Vd is Abbe number of the lens.
10. The vehicle-mounted monitoring optical lens according to claim 1, wherein the sixth lens satisfies | F6/F | ≧ 2.2, F6 is a focal length of the sixth lens, F is a focal length of the entire optical system, Nd of the sixth lens is > 1.75, and Vd of the sixth lens is < 45, where Nd is a refractive index of the lens and Vd is an Abbe number of the lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110262174.5A CN113031190B (en) | 2021-03-10 | 2021-03-10 | Vehicle-mounted monitoring optical lens |
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| CN202110262174.5A CN113031190B (en) | 2021-03-10 | 2021-03-10 | Vehicle-mounted monitoring optical lens |
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| CN115407487A (en) * | 2022-08-25 | 2022-11-29 | 嘉兴中润光学科技股份有限公司 | Vehicle-mounted lens and imaging device |
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