CN114791661B - Vehicle-mounted monitoring lens and application thereof - Google Patents
Vehicle-mounted monitoring lens and application thereof Download PDFInfo
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- CN114791661B CN114791661B CN202210460227.9A CN202210460227A CN114791661B CN 114791661 B CN114791661 B CN 114791661B CN 202210460227 A CN202210460227 A CN 202210460227A CN 114791661 B CN114791661 B CN 114791661B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 192
- 230000003287 optical effect Effects 0.000 claims abstract description 65
- 238000003384 imaging method Methods 0.000 claims abstract description 52
- 230000009286 beneficial effect Effects 0.000 description 21
- 230000002349 favourable effect Effects 0.000 description 15
- 230000004075 alteration Effects 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000005499 meniscus Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000008921 facial expression Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012634 optical imaging Methods 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
- G02B13/001—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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- 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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- Optics & Photonics (AREA)
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Abstract
The invention provides a vehicle-mounted monitoring lens and application thereof, wherein a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a flat plate and an image plane IMA are sequentially arranged along the incidence direction of an optical axis; the first lens has positive focal power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface or a convex surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface or a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a concave surface or a convex surface; the invention provides the vehicle-mounted monitoring lens with high resolution, large aperture, small distortion and small volume, which has the advantages of simple structure, contribution to miniaturization of a module and lower cost, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a vehicle-mounted monitoring lens and application thereof.
Background
With the rapid development and wide application of intelligent auxiliary driving systems, the requirements for monitoring the automobile condition and the driving state of a driver are continuously improved, and in order to improve the capture of the facial expression state of the driver, the monitoring lens with the advantages of instant and accurate fatigue driving warning, high resolution, large aperture, small distortion, small volume and low cost is increasingly favored. However, the existing driver state monitoring lens is 5G in most of complex structures, the size of the lens head is more than or equal to 8mm, the optical total length of the lens is more than or equal to 13.5mm, the size of the lens is large, the aperture is large, the distortion is large, the cost is high, the assembly is complex, the module is not beneficial to miniaturization, the expression state of the face of the driver cannot be captured clearly, and driving accidents are frequently caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides the vehicle-mounted monitoring lens with high resolution, large aperture, small distortion and small volume, which has a simple structure, is beneficial to miniaturization of a module, has lower cost, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the vehicle-mounted monitoring lens is sequentially provided with a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a flat plate and an image plane IMA along the incidence direction of an optical axis;
the first lens has positive focal power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface or a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface or a concave surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a concave surface or a convex surface;
the vehicle-mounted monitoring lens meets the following conditions: TTL/f is less than or equal to 4.6, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the vehicle-mounted monitoring lens on the optical axis, and f is the focal length of the whole lens.
The invention provides the vehicle-mounted monitoring lens with high resolution, large aperture, small distortion and small volume, which has the advantages of simple structure, contribution to miniaturization of a module and lower cost, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
As a preferable technical scheme, the first lens satisfies Nd1 > 1.95, and vd1<30, wherein Nd1 refers to the refractive index of the first lens, and Vd1 refers to the abbe number of the first lens; the second lens satisfies 1.65 > Nd2 > 1.55, 55 < Vd2 < 65, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens; the third lens satisfies 2.05 > Nd3 > 1.95, 30 > Vd3 > 25, wherein Nd3 refers to the refractive index of the third lens, vd3 refers to the Abbe number of the third lens; the fourth lens satisfies 2.05 > Nd4 > 1.95, and 30 > Vd4 > 25, wherein Nd4 refers to the refractive index of the fourth lens, and Vd4 refers to the Abbe number of the fourth lens.
As a preferable technical scheme, the vehicle-mounted monitoring lens meets the following conditional expression:
0.3＞BFL/TTL＞0.15，
the BFL is the distance between the center of the image side surface of the fourth lens and the imaging surface of the vehicle-mounted monitoring lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the vehicle-mounted monitoring lens on the optical axis.
As a preferable technical scheme, the vehicle-mounted monitoring lens meets the following conditional expression:
5.0≤FOV/h/D≤5.3，
wherein, FOV is the maximum half field angle of the vehicle-mounted monitoring lens; d is the maximum aperture of the first lens object side surface corresponding to the maximum field angle of the vehicle-mounted monitoring lens; and h is the image height corresponding to the maximum field angle of the vehicle-mounted monitoring lens.
As a preferable technical solution, the following conditional expression is satisfied among the maximum half field angle FOV of the vehicle-mounted monitoring lens, the whole set of focal length values f of the vehicle-mounted monitoring lens, and the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens:
31.5≤(FOV×f)/h≤33.5
as a preferable technical scheme, the vehicle-mounted monitoring lens meets the following conditional expression:
1.3≤f1/f≤2.6,-5.5≤f2/f≤-0.9,1.1≤f3/f≤2.6，
and f1, f2 and f3 are the focal lengths of the first lens, the second lens and the third lens in sequence, and f is the focal length value of the whole set of the vehicle-mounted monitoring lens.
As a preferable technical scheme, the aperture coefficient of the vehicle-mounted monitoring lens satisfies the following conditional expression:
FNO≤2.0，
wherein FNO is aperture coefficient.
As an optimal technical scheme, the head size of the vehicle-mounted monitoring lens is less than or equal to 6mm.
As an optimal technical scheme, the optical total length of the vehicle-mounted monitoring lens is less than or equal to 11.5mm.
The invention further provides an application of the vehicle-mounted monitoring lens as a driver face monitoring lens in vehicle driving.
The vehicle-mounted monitoring lens and the application thereof provided by the invention have the following beneficial effects:
1) The vehicle-mounted monitoring lens provided by the invention has a simple structure, has a small volume, is beneficial to miniaturization of a module, has low cost, has high resolution, large aperture and small distortion, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents;
2) The vehicle-mounted monitoring lens provided by the invention adopts 4 glass spherical lenses, has good processability, simple assembly, low cost, large aperture FNO2.0, distortion of less than or equal to 25.8%, head size of less than or equal to 6mm, optical length of less than or equal to 11.5mm, small volume, contribution to module miniaturization and clear imaging.
Drawings
Fig. 1 is a block diagram of a vehicle-mounted monitoring lens provided in embodiment 1 (an object side is at a leftmost position, and an image side is at a rightmost position);
fig. 2 is a field curvature distortion diagram of the vehicle-mounted monitoring lens provided in embodiment 1;
fig. 3 is a block diagram of the vehicle-mounted monitoring lens provided in embodiment 2 (the object side is at the leftmost position, and the image side is at the rightmost position);
fig. 4 is a field curvature distortion chart of the in-vehicle monitoring lens provided in embodiment 2;
fig. 5 is a block diagram of the vehicle-mounted monitoring lens provided in embodiment 3 (the object side is at the leftmost position, and the image side is at the rightmost position);
fig. 6 is a field curvature distortion chart of the in-vehicle monitoring lens provided in embodiment 3;
fig. 7 is a block diagram of the in-vehicle monitoring lens provided in embodiment 4 (the object side is at the leftmost position, and the image side is at the rightmost position);
fig. 8 is a field curvature distortion chart of the in-vehicle monitoring lens provided in embodiment 4;
wherein 1-a first lens; 2-a second lens; 3-a third lens; 4-a fourth lens; 5-plate; 6-image plane IMA; 7-diaphragm.
Detailed Description
It should be noted that, the terms "first," "second," "third," and "fourth" are used to define the components, and are merely for convenience in distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, so they should not be construed as limiting the scope of the present invention.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It will be appreciated that the present invention achieves the objects of the invention by some embodiments.
Example 1
As shown in fig. 1, the present invention provides a vehicle-mounted monitoring lens, which is sequentially provided with a diaphragm 7, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a flat plate 5 and an image plane IMA6 along an optical axis incidence direction;
the first lens element 1 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the second lens element 2 has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the third lens element 3 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the fourth lens element 4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is concave;
the first lens 1 has positive focal power, the object side of the first lens is concave, the image side of the first lens is convex, and the first lens 1 is meniscus-shaped, so that light rays can be collected, distortion is reduced, and imaging quality is improved; the diaphragm is arranged in front of the first lens 1, so that the aperture of the lens is reduced; the second lens 2 has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface, so that the lens is favorable for receiving the folded light more smoothly, reducing aberration, reducing sensitivity of the lens and reducing aperture of the lens; the third lens 3 and the fourth lens 4 have positive focal power, which is beneficial to converting light rays and reducing the lens length; the fourth lens 4 is a meniscus lens, which is beneficial to correcting field curvature and improving imaging quality;
the distance TTL from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 11.5, the focal length f of the whole lens is 3.59, TTL/f=3.2, and the following conditional expression is satisfied: TTL/f is less than or equal to 4.6, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis, and f is the focal length of the whole lens group; further, TTL/f is less than or equal to 4.6, which is beneficial to miniaturization of the lens. The optical parameters of the in-vehicle monitoring lens provided in embodiment 1 are as follows in table 1:
table 1 optical parameters of the in-vehicle monitoring lens provided in embodiment 1
In table 1, the radii of curvature of the surfaces of the diaphragm 7, the flat plate 5 and the image plane IMA6 are infinite, indicating that the surfaces are planar.
From table 1 we can observe that the first lens 1 satisfies Nd1 > 1.95, vd1<30, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies 1.65 > Nd2 > 1.55, 55 < Vd2 < 65, wherein Nd2 refers to the refractive index of the second lens 2, vd2 refers to the Abbe number of the second lens 2; the third lens 3 satisfies 2.05 > Nd3 > 1.95, 30 > Vd3 > 25, wherein Nd3 refers to the refractive index of the third lens 3, vd3 refers to the Abbe number of the third lens 3; the fourth lens 4 satisfies 2.05 > Nd4 > 1.95, 30 > Vd4 > 25, where Nd4 means the refractive index of the fourth lens 4, and Vd4 means the Abbe number of the fourth lens 4.
The distance BFL between the center of the image side surface of the fourth lens element 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 3.3, the distance TTL between the center of the object side surface of the first lens element 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 11.5, and BFL/ttl=0.287, which satisfies the following conditional expression: the ratio of BFL to TTL is greater than 0.15 and greater than 0.3, wherein BFL is the distance between the center of the image side surface of the fourth lens 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis; TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis; further, 0.3 is larger than BFL/TTL is larger than 0.15, which is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 42.5, the maximum light-transmitting caliber D of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 1.8, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, FOV/h/D= 5.024, and the following conditional expression is satisfied: 5.0-5.3 FOV/h/D, wherein FOV is the maximum half field angle of the vehicle-mounted monitoring lens; d is the maximum aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted monitoring lens; further, the FOV/h/D is not more than 5.0 and not more than 5.3, which is beneficial to realizing small caliber of the front end lens.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 42.5, the whole group focal length f of the vehicle-mounted monitoring lens is 3.59, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, (FOV×f)/h= 32.463, and the following conditional expression is satisfied: the FOV multiplied by f/h is more than or equal to 31.5 and less than or equal to 33.5, and the three indexes are controlled, so that the lens distortion is reduced.
The vehicle-mounted monitoring lens meets the following conditional expression:
1.3.ltoreq.f1/f.ltoreq.2.6, -5.5.ltoreq.f2/f.ltoreq. 0.9,1.1.ltoreq.f3/f.ltoreq.2.6, wherein f1, f2 and f3 are the focal lengths of the first lens 1, the second lens 2 and the third lens 3 in this order; f is the whole group focal length value of the vehicle-mounted monitoring lens, and the lens focal length is reasonably matched, so that the assembly sensitivity is reduced, the lens is controlled in a very small range after being at high and low temperature Jiao Piaoyi, and clear imaging is achieved.
The aperture coefficient of the vehicle-mounted monitoring lens meets the following conditional expression: FNO is less than or equal to 2.0, wherein FNO is aperture coefficient; therefore, the vehicle-mounted monitoring lens in the embodiment meets the requirements of the large aperture lens in the market.
The head size of the vehicle-mounted monitoring lens is 6mm, the head size of the vehicle-mounted monitoring lens is less than or equal to 6mm, the optical total length of the vehicle-mounted monitoring lens is 11.5mm, the optical total length of the vehicle-mounted monitoring lens is less than or equal to 11.5mm, the distortion of the vehicle-mounted monitoring lens is-25.8%, and the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%.
As shown in fig. 2, the field curvature distortion chart of the vehicle-mounted monitoring lens provided in embodiment 1, wherein the left chart is a field curvature chart, the ordinate of the field curvature chart is the field angle, the abscissa is the distance of the image point from the paraxial image plane, T represents the meridian field curvature, S represents the sagittal field curvature, and the field curvature chart shows the current focal plane or the distance of the image plane from the paraxial focal plane as a function of the field coordinates, and is divided into meridian field curvature and sagittal field curvature; the right graph is a distortion graph, the ordinate of the distortion graph is a field angle, the abscissa is a distortion percentage, the distortion belongs to the aberration of the chief ray and reflects the similarity degree of an object image, and the optical distortion of the vehicle-mounted monitoring lens in the specific embodiment is smaller, the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%, and the image is clear.
The vehicle-mounted monitoring lens provided by the embodiment has a simple structure, has a small volume, is favorable for miniaturization of a module, is low in cost, has high resolution, large aperture and small distortion, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
Example 2
As shown in fig. 3, the present invention provides a vehicle-mounted monitoring lens, which is sequentially provided with a diaphragm 7, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a flat plate 5 and an image plane IMA6 along an optical axis incidence direction;
the first lens element 1 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the second lens element 2 has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the third lens element 3 has positive refractive power, and has a convex object-side surface and a convex image-side surface;
the fourth lens element 4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is concave;
the first lens 1 has positive focal power, the object side of the first lens is concave, the image side of the first lens is convex, and the first lens 1 is meniscus-shaped, so that light rays can be collected, distortion is reduced, and imaging quality is improved; the diaphragm is arranged in front of the first lens 1, which is beneficial to reducing the aperture of the lens; the second lens element 2 has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex; the lens is favorable for receiving the folded light more smoothly, reducing aberration and sensitivity of the lens, and simultaneously is favorable for reducing the caliber of the lens; the third lens 3 and the fourth lens 4 have positive focal power, which is beneficial to converting light rays and reducing the lens length; the fourth lens 4 is a meniscus lens, which is favorable for correcting field curvature and improving imaging quality;
the distance TTL from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 11.9, the focal length f of the whole lens is 3.49, TTL/f=3.41, and the following conditional expression is satisfied: TTL/f is less than or equal to 4.6, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis, and f is the focal length of the whole lens group; further, TTL/f is less than or equal to 4.6, which is beneficial to miniaturization of the lens. The optical parameters of the in-vehicle monitoring lens provided in embodiment 2 are as follows in table 2:
table 2 optical parameters of the in-vehicle monitoring lens provided in embodiment 2
In table 2, the radii of curvature of the surfaces of the diaphragm, the flat plate and the image plane IMA are infinite, indicating that the surfaces are planar.
From table 2 we can observe that the first lens 1 satisfies Nd1 > 1.95, vd1<30, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies 1.65 > Nd2 > 1.55, 55 < Vd2 < 65, wherein Nd2 refers to the refractive index of the second lens 2, vd2 refers to the Abbe number of the second lens 2; the third lens 3 satisfies 2.05 > Nd3 > 1.95, 30 > Vd3 > 25, wherein Nd3 refers to the refractive index of the third lens 3, vd3 refers to the Abbe number of the third lens 3; the fourth lens 4 satisfies 2.05 > Nd4 > 1.95, 30 > Vd4 > 25, where Nd4 means the refractive index of the fourth lens 4, and Vd4 means the Abbe number of the fourth lens 4.
The distance BFL between the center of the image side surface of the fourth lens element 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 2.23, the distance TTL between the center of the object side surface of the first lens element 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 11.9, and BFL/ttl=0.187, which satisfies the following conditional expression: the ratio of BFL to TTL is greater than 0.15 and greater than 0.3, wherein BFL is the distance between the center of the image side surface of the fourth lens and the imaging surface of the vehicle-mounted monitoring lens on the optical axis; TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis; further, 0.3 is larger than BFL/TTL is larger than 0.15, which is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 43, the maximum light passing caliber D of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 1.8, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, FOV/h/d= 5.083, and the following conditional expression is satisfied: 5.0-5.3 FOV/h/D, wherein FOV is the maximum half field angle of the vehicle-mounted monitoring lens; d is the maximum aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted monitoring lens; further, the FOV/h/D is not more than 5.0 and not more than 5.3, which is beneficial to realizing small caliber of the front end lens.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 43, the whole group focal length f of the vehicle-mounted monitoring lens is 3.49, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, (fov×f)/h=31.93, and the following conditional expression is satisfied: the FOV multiplied by f/h is more than or equal to 31.5 and less than or equal to 33.5, and the three indexes are controlled, so that the lens distortion is reduced.
The vehicle-mounted monitoring lens meets the following conditional expression:
1.3.ltoreq.f1/f.ltoreq.2.6, -5.5.ltoreq.f2/f.ltoreq. 0.9,1.1.ltoreq.f3/f.ltoreq.2.6, wherein f1, f2 and f3 are the focal lengths of the first lens 1, the second lens 2 and the third lens 3 in sequence, and f is the focal length of the whole lens group; by reasonably matching the focal length of the lens, the assembly sensitivity is reduced, the Jiao Piaoyi of the lens at high and low temperatures is controlled in a small range, and clear imaging is achieved.
The aperture coefficient of the vehicle-mounted monitoring lens meets the following conditional expression: FNO is less than or equal to 2.0, wherein FNO is aperture coefficient; therefore, the vehicle-mounted monitoring lens in the embodiment meets the requirements of the large aperture lens in the market.
The head size of the vehicle-mounted monitoring lens is 5.8mm, the head size of the vehicle-mounted monitoring lens is less than or equal to 6mm, the optical total length of the vehicle-mounted monitoring lens is 11.3mm, the optical total length of the vehicle-mounted monitoring lens is less than or equal to 11.5mm, the distortion of the vehicle-mounted monitoring lens is-25.9%, and the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%.
As shown in fig. 4, the field curvature distortion chart of the vehicle-mounted monitoring lens provided in embodiment 2, wherein the left chart is a field curvature chart, the ordinate of the field curvature chart is the field angle, the abscissa is the distance of the image point from the paraxial image plane, T represents the meridian field curvature, S represents the sagittal field curvature, and the field curvature chart shows the current focal plane or the distance of the image plane from the paraxial focal plane as a function of the field coordinates, and is divided into meridian field curvature and sagittal field curvature; the right graph is a distortion graph, the ordinate of the distortion graph is a field angle, the abscissa is a distortion percentage, the distortion belongs to the aberration of the chief ray and reflects the similarity degree of an object image, and the optical distortion of the vehicle-mounted monitoring lens in the specific embodiment is smaller, the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%, and the image is clear.
The vehicle-mounted monitoring lens provided by the embodiment has a simple structure, has a small volume, is favorable for miniaturization of a module, is low in cost, has high resolution, large aperture and small distortion, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
Example 3
As shown in fig. 5, the present invention provides a vehicle-mounted monitoring lens, which is sequentially provided with a diaphragm 7, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a flat plate 5 and an image plane IMA6 along the incidence direction of an optical axis;
the first lens element 1 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the second lens element 2 has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the third lens element 3 has positive refractive power, and has a convex object-side surface and a convex image-side surface;
the fourth lens element 4 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the first lens 1 has positive focal power, the object side of the first lens is concave, the image side of the first lens is convex, and the first lens 1 is meniscus-shaped, so that light rays can be collected, distortion is reduced, and imaging quality is improved; the diaphragm is arranged in front of the first lens 1, which is beneficial to reducing the aperture of the lens; the second lens 2 has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface, so that the lens is favorable for receiving the folded light more smoothly, reducing aberration, reducing sensitivity of the lens and reducing aperture of the lens; the third lens 3 and the fourth lens 4 have positive focal power, which is favorable for converting light rays, reducing the lens length, and the fourth lens 4 is a meniscus lens, which is favorable for correcting field curvature and improving imaging quality;
the distance TTL from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 11.5, the focal length f of the whole lens is 3.61, TTL/f=3.19, and the following conditional expression is satisfied: TTL/f is less than or equal to 4.6, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis, and f is the focal length of the whole lens group; further, TTL/f is less than or equal to 4.6, which is beneficial to miniaturization of the lens. The optical parameters of the in-vehicle monitoring lens provided in embodiment 3 are as follows in table 3:
table 3 optical parameters of the in-vehicle monitoring lens provided in embodiment 3
In table 3, the radii of curvature of the surfaces of the diaphragm, the flat plate and the image plane IMA are infinite, indicating that the surfaces are planar.
From table 3, we can observe that the first lens 1 satisfies Nd1 > 1.95, vd1<30, where Nd1 refers to the refractive index of the first lens 1, and Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies 1.65 > Nd2 > 1.55, 55 < Vd2 < 65, wherein Nd2 refers to the refractive index of the second lens 2, vd2 refers to the Abbe number of the second lens 2; the third lens 3 satisfies 2.05 > Nd3 > 1.95, 30 > Vd3 > 25, wherein Nd3 refers to the refractive index of the third lens 3, vd3 refers to the Abbe number of the third lens 3; the fourth lens 4 satisfies 2.05 > Nd4 > 1.95, 30 > Vd4 > 25, where Nd4 means the refractive index of the fourth lens 4, and Vd4 means the Abbe number of the fourth lens 4.
The distance BFL between the center of the image side surface of the fourth lens element 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 2.037, the distance TTL between the center of the object side surface of the first lens element 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 11.5, BFL/ttl=0.177, and the following conditional expression is satisfied: the ratio of BFL to TTL is greater than 0.15 and greater than 0.3, wherein BFL is the distance between the center of the image side surface of the fourth lens 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis; TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis; further, 0.3 is larger than BFL/TTL is larger than 0.15, which is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 43, the maximum light passing caliber D of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 1.8, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, FOV/h/d= 5.083, and the following conditional expression is satisfied: 5.0-5.3 FOV/h/D, wherein FOV is the maximum half field angle of the vehicle-mounted monitoring lens; d is the maximum aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted monitoring lens; further, the FOV/h/D is not more than 5.0 and not more than 5.3, which is beneficial to realizing small caliber of the front end lens.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 43, the whole group focal length f of the vehicle-mounted monitoring lens is 3.61, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, (fov×f)/h= 33.028), and the following conditional expression is satisfied: the FOV multiplied by f/h is more than or equal to 31.5 and less than or equal to 33.5, and the three indexes are controlled, so that the lens distortion is reduced.
The vehicle-mounted monitoring lens meets the following conditional expression:
1.3.ltoreq.f1/f.ltoreq.2.6, -5.5.ltoreq.f2/f.ltoreq. 0.9,1.1.ltoreq.f3/f.ltoreq.2.6, wherein f1, f2 and f3 are the focal lengths of the first lens 1, the second lens 2 and the third lens 3 in sequence, and f is the focal length of the whole lens group; the lens focal length is reasonably matched, so that the assembly sensitivity is reduced, the Jiao Piaoyi of the lens at high and low temperatures is controlled in a small range, and clear imaging is achieved.
The aperture coefficient of the vehicle-mounted monitoring lens meets the following conditional expression:
FNO is less than or equal to 2.0, wherein FNO is aperture coefficient; therefore, the vehicle-mounted monitoring lens in the embodiment meets the requirements of the large aperture lens in the market.
The head size of the vehicle-mounted monitoring lens is 5.5mm, the head size of the vehicle-mounted monitoring lens is less than or equal to 6mm, the optical total length of the vehicle-mounted monitoring lens is 10.9mm, the optical total length of the vehicle-mounted monitoring lens is less than or equal to 11.5mm, the distortion of the vehicle-mounted monitoring lens is-26.9%, and the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%.
As shown in fig. 6, the field curvature distortion chart of the vehicle-mounted monitoring lens provided in embodiment 3, wherein the left chart is a field curvature chart, the ordinate of the field curvature chart is the field angle, the abscissa is the distance of the image point from the paraxial image plane, T represents the meridian field curvature, S represents the sagittal field curvature, and the field curvature chart shows the current focal plane or the distance of the image plane from the paraxial focal plane as a function of the field coordinates, and is divided into meridian field curvature and sagittal field curvature; the right graph is a distortion graph, the ordinate of the distortion graph is a field angle, the abscissa is a distortion percentage, the distortion belongs to the aberration of the chief ray and reflects the similarity degree of an object image, and the optical distortion of the vehicle-mounted monitoring lens in the specific embodiment is smaller, the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%, and the image is clear.
The vehicle-mounted monitoring lens provided by the embodiment has a simple structure, has a small volume, is favorable for miniaturization of a module, is low in cost, has high resolution, large aperture and small distortion, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
Example 4
As shown in fig. 7, the present invention provides a vehicle-mounted monitoring lens, which is sequentially provided with a diaphragm 7, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a flat plate 5 and an image plane IMA6 along an optical axis incidence direction;
the first lens element 1 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the second lens element 2 has negative refractive power, and has a concave object-side surface and a concave image-side surface;
the third lens element 3 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex;
the fourth lens element 4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is concave;
the first lens 1 has positive focal power, the object side of the first lens is concave, the image side of the first lens is convex, and the first lens 1 is meniscus-shaped, so that light rays can be collected, distortion is reduced, and imaging quality is improved; the diaphragm is arranged in front of the first lens 1, so that the aperture of the lens is reduced; the second lens 2 has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface, so that the object side surface is favorable for receiving the folded light rays more smoothly, reducing the aberration, reducing the sensitivity of the lens and simultaneously favorable for reducing the caliber of the lens; the third lens 3 and the fourth lens 4 have positive focal power, which is favorable for converting light rays, reducing the lens length, and the fourth lens 4 is a meniscus lens, which is favorable for correcting field curvature and improving imaging quality;
the distance TTL from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 10.73, the focal length f of the whole lens is 3.55, TTL/f=3.023, and the following conditional expression is satisfied: TTL/f is less than or equal to 4.6, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis, and f is the focal length of the whole lens group; further, TTL/f is less than or equal to 4.6, which is beneficial to miniaturization of the lens; the optical parameters of the in-vehicle monitoring lens provided in embodiment 4 are as follows in table 4:
table 4 optical parameters of the in-vehicle monitoring lens provided in embodiment 4
In table 4, the radii of curvature of the surfaces of the diaphragm 7, the flat plate 5 and the image plane IMA6 are infinite, indicating that the surfaces are planar.
From table 4, we can observe that the first lens 1 satisfies Nd1 > 1.95, vd1<30, where Nd1 refers to the refractive index of the first lens 1, and Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies 1.65 > Nd2 > 1.55, 55 < Vd2 < 65, wherein Nd2 refers to the refractive index of the second lens 2, vd2 refers to the Abbe number of the second lens 2; the third lens 3 satisfies 2.05 > Nd3 > 1.95, 30 > Vd3 > 25, wherein Nd3 refers to the refractive index of the third lens 3, vd3 refers to the Abbe number of the third lens 3; the fourth lens 4 satisfies 2.05 > Nd4 > 1.95, 30 > Vd4 > 25, where Nd4 means the refractive index of the fourth lens 4, and Vd4 means the Abbe number of the fourth lens 4.
The distance BFL between the center of the image side surface of the fourth lens element 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 3.167, the distance TTL between the center of the object side surface of the first lens element 1 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis is 10.73, and the following conditional expression is satisfied: the ratio of BFL to TTL is greater than 0.15 and greater than 0.3, wherein BFL is the distance between the center of the image side surface of the fourth lens 4 and the imaging surface of the vehicle-mounted monitoring lens on the optical axis; TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the vehicle-mounted monitoring lens on the optical axis; further, 0.3 is larger than BFL/TTL is larger than 0.15, which is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 43, the maximum light passing caliber D of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 1.75, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, FOV/h/d= 5.228, and the following conditional expression is satisfied: 5.0-5.3 FOV/h/D, wherein FOV is the maximum half field angle of the vehicle-mounted monitoring lens; d is the maximum aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the vehicle-mounted monitoring lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted monitoring lens; further, the FOV/h/D is not more than 5.0 and not more than 5.3, which is beneficial to realizing small caliber of the front end lens.
The maximum half field angle FOV of the vehicle-mounted monitoring lens is 43, the whole group focal length f of the vehicle-mounted monitoring lens is 3.55, the image height h corresponding to the maximum field angle of the vehicle-mounted monitoring lens is 4.7, (fov×f)/h= 32.479), and the following conditional expression is satisfied: the FOV multiplied by f/h is more than or equal to 31.5 and less than or equal to 33.5, and the three indexes are controlled, so that the lens distortion is reduced.
The vehicle-mounted monitoring lens meets the following conditional expression:
1.3.ltoreq.f1/f.ltoreq.2.6, -5.5.ltoreq.f2/f.ltoreq. 0.9,1.1.ltoreq.f3/f.ltoreq.2.6, wherein f1, f2 and f3 are the focal lengths of the first lens 1, the second lens 2 and the third lens 3 in this order; the lens focal length is reasonably matched, so that the assembly sensitivity is reduced, the Jiao Piaoyi of the lens at high and low temperatures is controlled in a small range, and clear imaging is achieved.
The aperture coefficient of the vehicle-mounted monitoring lens meets the following conditional expression:
FNO is less than or equal to 2.0, wherein FNO is aperture coefficient; therefore, the vehicle-mounted monitoring lens in the embodiment meets the requirements of the large aperture lens in the market.
The head size of the vehicle-mounted monitoring lens is 5.2mm, the head size of the vehicle-mounted monitoring lens is less than or equal to 6mm, the optical total length of the vehicle-mounted monitoring lens is 10.6mm, the optical total length of the vehicle-mounted monitoring lens is less than or equal to 11.5mm, the distortion of the vehicle-mounted monitoring lens is-26.7%, and the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%.
As shown in fig. 8, the field curvature distortion chart of the vehicle-mounted monitoring lens provided in embodiment 4, wherein the left chart is a field curvature chart, the ordinate of the field curvature chart is the field angle, the abscissa is the distance of the image point from the paraxial image plane, T represents the meridian field curvature, S represents the sagittal field curvature, and the field curvature chart shows the current focal plane or the distance of the image plane from the paraxial focal plane as a function of the field coordinates, and is divided into meridian field curvature and sagittal field curvature; the right graph is a distortion graph, the ordinate of the distortion graph is a field angle, the abscissa is a distortion percentage, the distortion belongs to the aberration of the chief ray and reflects the similarity degree of an object image, and the optical distortion of the vehicle-mounted monitoring lens in the specific embodiment is smaller, the distortion of the vehicle-mounted monitoring lens is less than or equal to-25.8%, and the image is clear.
The vehicle-mounted monitoring lens provided by the embodiment has a simple structure, has a small volume, is favorable for miniaturization of a module, is low in cost, has high resolution, large aperture and small distortion, can clearly capture the expression state of the face of an imaging driver, and effectively avoids driving accidents.
The vehicle-mounted monitoring lens provided in embodiments 1-4 is applied to vehicle driving as a driver face monitoring lens, and can clearly capture the expression state of the face of the imaging driver, thereby effectively avoiding driving accidents.
It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all modifications and equivalents falling within the scope of the claims of the present application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. The vehicle-mounted monitoring lens is characterized in that a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a flat plate and an image plane IMA are sequentially arranged along the incidence direction of an optical axis;
the first lens has positive focal power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface or a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface or a concave surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a concave surface or a convex surface;
the vehicle-mounted monitoring lens meets the following conditions: TTL/f is less than or equal to 4.6, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the vehicle-mounted monitoring lens on the optical axis, and f is the focal length of the whole lens;
the vehicle-mounted monitoring lens meets the following conditional expression:
5.0≤FOV/h/D≤5.3
wherein, FOV is the maximum half field angle of the vehicle-mounted monitoring lens; d is the maximum aperture of the first lens object side surface corresponding to the maximum field angle of the vehicle-mounted monitoring lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted monitoring lens;
the maximum half view angle FOV of the vehicle-mounted monitoring lens, the whole group focal length value f of the vehicle-mounted monitoring lens and the image height h corresponding to the maximum view angle of the vehicle-mounted monitoring lens meet the following conditional expression:
31.5≤（FOV×f）/h≤33.5
the vehicle-mounted monitoring lens meets the following conditional expression:
1.3≤f1/f≤2.6, -5.5≤f2/f≤-0.9, 1.1≤f3/f≤2.6
wherein f1, f2 and f3 are the focal lengths of the first lens, the second lens and the third lens in sequence, and f is the focal length value of the whole group of the vehicle-mounted monitoring lens;
the aperture coefficient of the vehicle-mounted monitoring lens meets the following conditional expression:
FNO≤2.0
wherein FNO is aperture coefficient.
2. The in-vehicle monitoring lens according to claim 1, wherein the first lens satisfies Nd1 > 1.95, vd1<30, wherein Nd1 refers to a refractive index of the first lens, and Vd1 refers to an abbe number of the first lens; the second lens satisfies 1.65 > Nd2 > 1.55, 55 < Vd2 < 65, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens; the third lens satisfies 2.05 > Nd3 > 1.95, 30 > Vd3 > 25, wherein Nd3 refers to the refractive index of the third lens, vd3 refers to the Abbe number of the third lens; the fourth lens satisfies 2.05 > Nd4 > 1.95, and 30 > Vd4 > 25, wherein Nd4 refers to the refractive index of the fourth lens, and Vd4 refers to the Abbe number of the fourth lens.
3. The in-vehicle monitoring lens according to claim 1, wherein the in-vehicle monitoring lens satisfies the following conditional expression:
0.3＞BFL/TTL＞0.15，
the BFL is the distance between the center of the image side surface of the fourth lens and the imaging surface of the vehicle-mounted monitoring lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the vehicle-mounted monitoring lens on the optical axis.
4. The in-vehicle monitoring lens according to claim 1, wherein a head size of the in-vehicle monitoring lens is 6mm or less.
5. The in-vehicle monitoring lens according to claim 1, wherein an optical total length of the in-vehicle monitoring lens is 11.5mm or less.
6. The in-vehicle monitoring lens according to claim 1, which is applied in vehicle driving as a driver's face monitoring lens.
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| CN110703419A (en) * | 2019-11-18 | 2020-01-17 | 浙江舜宇光学有限公司 | Image pickup lens assembly |
| CN110908095A (en) * | 2019-12-24 | 2020-03-24 | 协益电子（苏州）有限公司 | Small-field infrared monitoring and early warning lens |
| CN112034597A (en) * | 2020-09-25 | 2020-12-04 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| TW202045975A (en) * | 2019-06-05 | 2020-12-16 | 紘立光電股份有限公司 | Imaging lens, imaging device and electronic device having the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW202045975A (en) * | 2019-06-05 | 2020-12-16 | 紘立光電股份有限公司 | Imaging lens, imaging device and electronic device having the same |
| CN110703419A (en) * | 2019-11-18 | 2020-01-17 | 浙江舜宇光学有限公司 | Image pickup lens assembly |
| CN110908095A (en) * | 2019-12-24 | 2020-03-24 | 协益电子（苏州）有限公司 | Small-field infrared monitoring and early warning lens |
| CN112034597A (en) * | 2020-09-25 | 2020-12-04 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
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