CN109975954B - High-pixel road monitoring optical system and camera module applying same - Google Patents
High-pixel road monitoring optical system and camera module applying same Download PDFInfo
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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
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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Abstract
The embodiment of the invention discloses a high-pixel road monitoring optical system, which sequentially comprises the following components from an object plane to an image plane along an optical axis: the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive; the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative; the object plane side of the third lens is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive; the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is negative; the image plane side of the fifth lens is a concave surface, the image plane side is a concave surface, and the focal power of the fifth lens is negative; the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power is positive. On the other hand, the embodiment of the invention also provides a camera module. The optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and the number of the lenses is reasonable, the structure is simple, and the cost is lower; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of high pixels, large target surface and the like.
Description
Technical field:
the invention relates to an optical system and a camera module applied to the optical system, in particular to a high-pixel road monitoring optical system and a camera module applied to the optical system.
The background technology is as follows:
The existing optical system applied to the fields of road monitoring such as license plate recognition and automobile automatic auxiliary driving has the defects of a large number of lenses and a complex structure.
The invention comprises the following steps:
in order to solve the problems of a plurality of lenses and a complex structure of the existing optical system or camera module, an embodiment of the invention provides a high-pixel road monitoring optical system.
A high-pixel road monitoring optical system sequentially comprises from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens;
The object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
The object plane side of the third lens is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is negative;
The image plane side of the fifth lens is a concave surface, the image plane side is a concave surface, and the focal power of the fifth lens is negative;
The object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power is positive.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, wherein the high-pixel road monitoring optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and the number of the lenses is reasonable, the structure is simple, and the cost is lower; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of high pixels, large target surface and the like.
Description of the drawings:
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical system or camera module according to an embodiment of the present invention;
FIG. 2 is a graph of field curvature and distortion of an embodiment of an optical system or camera module according to the present invention;
FIG. 3 is a color chart of an embodiment of an optical system or camera module according to the present invention;
Fig. 4 is a graph of MTF curves for an embodiment of an optical system or camera module of the present invention.
The specific embodiment is as follows:
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
When embodiments of the present invention refer to the ordinal terms "first," "second," etc., it is to be understood that they are merely used for distinguishing between them unless the order of their presentation is indeed dependent on the context.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides a high-pixel road monitoring optical system, which sequentially includes, from an object plane to an image plane 8 along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6.
The object plane side of the first lens 1 is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens 2 is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens 3 is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens 4 is a convex surface, the image plane side is a convex surface, and the focal power thereof is negative;
the image plane side of the fifth lens 5 is a concave surface, the image plane side is a concave surface, and the focal power of the fifth lens is negative;
the sixth lens element 6 has a convex object-side surface, a convex image-side surface, and a positive optical power.
The optical system of the embodiment of the invention mainly comprises 6 lenses, the number of the lenses is reasonable, the structure is simple, and the cost is low; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of high pixels, large target surface and the like.
Further, as a preferred embodiment of the present invention, not limiting, the fourth lens 4 and the fifth lens 5 are cemented with each other to form a combined lens, the optical power of which is negative. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, not limiting, the focal length f45 of the combined lens satisfies: -0.43< f/f45< -0.22, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, not limiting, each lens of the optical system satisfies the following condition:
(1)0<f/f1<0.1；
(2)-0.82<f/f2<-0.65；
(3)0.65<f/f3<0.86；
(4)-0.43<f/f45<-0.22；
(5)0.58<f/f6<0.80；
wherein f is the focal length of the whole optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens. Different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of high pixels, large target surface and the like.
Still further, as a preferred embodiment of the present invention, without limitation, the focal length f1, the material refractive index Nd1, and the material abbe constant Vd1 of the first lens 1 satisfy: 0<f/f1<0.1, nd1 > 1.84, vd 1< 24, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the focal length f2, the material refractive index Nd2, and the material abbe constant Vd2 of the second lens 2 satisfy: -0.82< f/f2< -0.65, nd2 < 1.56, vd2 > 55, where f is the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, without limitation, the focal length f3, the material refractive index Nd3, and the material abbe constant Vd3 of the third lens 3 satisfy: 0.65< f/f3<0.86, nd3 > 1.81, vd 3< 47, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens 4 satisfy: nd4 is more than 1.80, vd4 is less than 47; and/or the refractive index Nd5 of the material of the fifth lens 5, the abbe constant Vd5 of the material satisfy: nd5 is less than 1.76, and Vd5 is more than 27. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the focal length f6 of the sixth lens 6, the material refractive index Nd6, and the material abbe constant Vd6 satisfy: 0.58< f/f6<0.80, nd 6< 1.56, vd6 > 55, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, not limiting, the aperture stop 7 is located between the third lens 3 and the fourth lens 4, near the fourth lens 4 side. For adjusting the intensity of the light beam.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the second lens 2 and the sixth lens 6 are both plastic aspherical lenses. The structure is simple, and good optical performance can be ensured.
Specifically, the optical system of the embodiment of the invention is matched with 1/2 'sensor', the focal length f=8.0 mm, the diaphragm index F/no=2.0, the field angle dfov=62°, the total optical length ttl= 30.84mm, and various basic parameters of the optical system are shown in the following table:
In the table, from the object plane to the image plane 8 along the optical axis, S1 and S2 are two surfaces of the first lens 1; s3 and S4 correspond to two surfaces of the second lens 2; s5 and S6 correspond to two surfaces of the third lens 3; STO is the diaphragm; s8 and S9 correspond to two surfaces of the fourth lens 4; s9 and S10 correspond to two surfaces of the fifth lens 5; s11 and S12 correspond to two surfaces of the sixth lens 6; s13 corresponds to one surface of the filter located between the sixth lens 6 and the image plane 8.
Still further, as a preferred embodiment of the present invention, not limiting, the surfaces of the second lens 2 and the sixth lens 6 are aspherical in shape, which satisfies the following equation:
Wherein, the parameter c=1/R is the curvature corresponding to the radius, y is the radial coordinate, the unit is the same as the lens length unit, k is conic coefficient, and a 1 to a 8 are coefficients corresponding to the radial coordinates respectively. The values of the aspherical correlations of the S3 surface and the S4 surface of the second lens 2, the S11 surface and the S12 surface of the sixth lens 6 are shown in the following table:
| K | α1 | α2 | α3 | α4 | α5 | α6 | |
| S3 | -3.065 | 0 | -1.722E-03 | 6.196E-05 | -1.382E-06 | 1.591E-08 | -7.399E-11 |
| S4 | -0.977 | 0 | -2.326E-03 | 1.185E-04 | -4.462E-07 | -1.029E-08 | -1.216E-09 |
| S11 | -8.232 | 0 | -1.135E-03 | -2.205E-05 | -1.009E-05 | 9.497E-07 | -5.433E-08 |
| S12 | 5.460 | 0 | 8.103E-04 | -3.576E-05 | 4.049E-06 | -3.296E-06 | 1.083E-08 |
As can be seen from fig. 2 to 4, the optical system of the present embodiment has good performance such as high pixel, large target surface, etc.
The camera module at least comprises an optical lens, wherein the high-pixel road monitoring optical system is arranged in the optical lens.
The optical system of the embodiment of the invention mainly comprises 6 lenses, the number of the lenses is reasonable, the structure is simple, and the cost is low; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of high pixels, large target surface and the like.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present invention.
Claims (2)
1. The high-pixel road monitoring optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object plane to an image plane along an optical axis; it is characterized in that the method comprises the steps of,
The object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
The object plane side of the third lens is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive;
The object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive;
The image plane side of the fifth lens is a concave surface, the image plane side is a concave surface, and the focal power of the fifth lens is negative;
the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power of the sixth lens is positive; the fourth lens and the fifth lens are mutually glued to form a combined lens, and the focal power of the combined lens is negative;
The focal length f45 of the combined lens satisfies: -0.43< f/f45< -0.22, where f is the focal length of the entire optical system;
Each lens of the optical system satisfies the following condition:
(1)0<f/f1<0.1；
(2)-0.82<f/f2<-0.65；
(3)0.65<f/f3<0.86；
(4)-0.43<f/f45<-0.22；
(5)0.58<f/f6<0.80；
Wherein f is the focal length of the whole optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens;
the focal length f1, the material refractive index Nd1, and the material abbe constant Vd1 of the first lens satisfy: 0<f/f1<0.1, nd1 > 1.84, vd 1< 24, wherein f is the focal length of the whole optical system;
The focal length f2, the material refractive index Nd2, and the material abbe constant Vd2 of the second lens satisfy: -0.82< f/f2< -0.65, nd 2< 1.56, vd2 > 55, where f is the focal length of the whole optical system;
The focal length f3, the material refractive index Nd3, and the material abbe constant Vd3 of the third lens satisfy: 0.65< f/f3<0.86, nd3 > 1.81, vd 3< 47, wherein f is the focal length of the whole optical system;
The material refractive index Nd4 and the material abbe constant Vd4 of the fourth lens satisfy: nd4 is more than 1.80, vd4 is less than 47; and/or the refractive index Nd5 of the material of the fifth lens, the abbe constant Vd5 of the material satisfy: nd5 is less than 1.76, vd5 is more than 27;
The focal length f6, the material refractive index Nd6, and the material abbe constant Vd6 of the sixth lens satisfy: 0.58< f/f6<0.80,
Nd6 is less than 1.56, vd6 is more than 55, wherein f is the focal length of the whole optical system.
2. An image pickup module at least comprising an optical lens, wherein the high-pixel road monitoring optical system of claim 1 is installed in the optical lens.
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