CN207440375U - High-pixel ultra-wide-angle optical system and camera module for its application - Google Patents

Abstract

The utility model discloses a high pixel super wide angle optical system and camera module of using thereof the utility model discloses a high pixel super wide angle optical system is equipped with along the optical axis from the object plane to image plane in proper order first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens, the focal power of first lens, second lens, third lens is negative, the focal power of fourth lens, fifth lens, sixth lens is positive, the focal power of seventh lens is negative, the focal power of eighth lens is positive, and this optical system satisfies TT L/EF L and is less than or equal to 16.8, wherein, TT L is the distance between first lens object plane side summit to the imaging surface of optical system, EF L is the effective focal length of optical system the utility model discloses a camera module, it mainly comprises 8 pieces of lens, simple structure, adopt different lens intercombination and reasonable distribution focal power, have large aperture, high pixel, good performance such as thermal difference, EF L is good.

Description

High-pixel ultra-wide-angle optical system and camera module for its application

Technical field:

The utility model relates to an optical system and an applied camera module, in particular to a high-pixel ultra-wide-angle optical system and an applied camera module.

Background technique:

With the development of semiconductor technology, the pixels of the photosensitive element are getting higher and higher, and the light-receiving area of the photosensitive element is also getting larger and larger. The ultra-wide-angle optical system tends to develop with higher pixels and a larger target surface. However, the existing wide-angle optical systems generally have the defects of low pixel size and high cost.

Invention content:

In order to overcome the common problem of low pixels in existing wide-angle optical systems, an embodiment of the utility model provides a high-pixel ultra-wide-angle optical system.

The high-pixel ultra-wide-angle optical system is provided in sequence along the optical axis from the object plane to the image plane: the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens lens;

The object plane side of the first lens is a convex surface, the image plane side is a concave surface, and its focal power is negative;

The object plane side of the second lens is a convex surface, the image plane side is a concave surface, and its focal power is negative;

The object plane side of the third lens is concave, and its focal power is negative;

The object plane side of the fourth lens is convex, and its focal power is positive;

The object plane side of the fifth lens is convex, the image plane side is convex, and its focal power is positive;

The object plane side of the sixth lens is convex, the image plane side is convex, and its focal power is positive;

The object plane side of the seventh lens is concave, and its focal power is negative;

The object plane side of the eighth lens is convex, the image plane side is convex, and its focal power is positive;

In addition, the optical system satisfies TTL/EFL≤16.8, wherein TTL is the distance from the apex of the first lens on the object side of the optical system to the imaging surface, and EFL is the effective focal length of the optical system.

On the other hand, the embodiment of the utility model also provides a camera module.

The camera module includes at least an optical lens, and the above-mentioned high-pixel ultra-wide-angle optical system is installed in the optical lens.

The embodiment of the utility model is mainly composed of 8 lenses and has a simple structure; different lenses are combined with each other and the focal power is reasonably distributed, and has good performances such as large aperture, large viewing angle, high pixel, and very good adiabatic difference.

Description of drawings:

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of optical system or camera module of the present utility model;

Fig. 2 is the distortion curve at +25°C of the optical system or camera module of the present invention;

Fig. 3 is the MTF curve diagram at +25°C of the optical system or camera module of the present invention;

Fig. 4 is the relative illuminance diagram at +25°C of the optical system or the camera module of the present invention;

Fig. 5 is the MTF curve diagram at -40 ℃ of the optical system or camera module of the present invention;

FIG. 6 is an MTF curve diagram of the optical system or camera module of the present invention at +85°C.

Detailed ways:

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, the high-pixel ultra-wide-angle optical system is provided in sequence along the optical axis from the object plane to the image plane: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 , the sixth lens 6 , the seventh lens 7 and the eighth lens 8 .

The object plane side of the first lens 1 is a convex surface, the image plane side is a concave surface, and its focal power is negative;

The object plane side of the second lens 2 is a convex surface, and the image plane side is a concave surface, and its focal power is negative;

The object plane side of the third lens 3 is a concave surface, and its focal power is negative;

The object plane side of the fourth lens 4 is a convex surface, and its refractive power is positive;

The object plane side of the fifth lens 5 is a convex surface, and the image plane side is a convex surface, and its refractive power is positive;

The object plane side of the sixth lens 6 is a convex surface, and the image plane side is a convex surface, and its refractive power is positive;

The object plane side of the seventh lens 7 is concave, and its focal power is negative;

The object plane side of the eighth lens 8 is a convex surface, and the image plane side is a convex surface, and its refractive power is positive;

And the optical system satisfies TTL/EFL≤16.8, wherein TTL is the distance from the apex of the first lens 1 on the object plane side of the optical system to the imaging plane, and EFL is the effective focal length of the optical system.

The embodiment of the utility model is mainly composed of 8 lenses and has a simple structure; different lenses are combined with each other and the focal power is reasonably distributed, and has good performances such as large aperture, large viewing angle, high pixel, and very good adiabatic difference.

In this embodiment, the effective focal length EFL of the optical system is the focal length f of the entire optical system, and the shape of the image plane side of the third lens 3 , the fourth lens 4 and the seventh lens 7 can be concave or convex according to design requirements.

Specifically, as a preferred implementation of this solution without limitation, in this embodiment, the object plane side of the third lens 3 is concave, the image plane side is convex, and its refractive power is negative; the object plane of the fourth lens 4 The side is convex, the image side is convex, and its power is positive; the object plane side of the seventh lens 7 is concave, and the image side is concave, and its power is negative.

Further, as a specific implementation of this solution, each lens of the optical system satisfies the following conditions:

(1)-15<f1<-5;

(2)-5<f2<-2;

(3) -50<f3<-10;

(4)3<f4<15;

(5)3<f5<15;

(6)2<f6<8;

(7)-10<f7<-2;

(8)2<f8<15;

Wherein, f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the second lens The focal length of the six lenses 6, f7 is the focal length of the seventh lens 7, and f8 is the focal length of the eighth lens 8. Through the mutual combination of different lenses and the reasonable distribution of optical power, the optical system has good performances such as large aperture, large viewing angle, high pixel, and very good adiabatic difference.

Furthermore, as a specific implementation of this solution without limitation, each lens of the optical system meets the following conditions:

(1)-12<f1/f<-2;

(2)-5<f2/f<-2;

(3) -20<f3/f<-5;

(4) 2<f4/f<10;

(5) 2<f5/f<10;

(6) 1.5<f6/f<5;

(7)-5<f7/f<-1.5;

(8)2<f8/f<10;

Among them, f is the focal length of the entire optical system, f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the fifth The focal length of the lens 5, f6 is the focal length of the sixth lens 6, f7 is the focal length of the seventh lens 7, and f8 is the focal length of the eighth lens 8. Through the mutual combination of different lenses and the reasonable distribution of optical power, the optical system has good performances such as large aperture, large viewing angle, high pixel, and very good adiabatic difference.

Furthermore, as a specific implementation of this solution without limitation, the focal length f1, material refractive index Nd1, and material Abbe constant Vd1 of the first lens 1 satisfy: -12<f1/f<-2, 1.72<Nd1<1.95 , 40<Vd1<60, where f is the focal length of the entire optical system. The structure is simple and can guarantee good optical performance.

Still further, as a specific implementation of this solution without limitation, the focal length f2, material refractive index Nd2, and material Abbe constant Vd2 of the second lens 2 satisfy: -5<f2/f<-2, 1.45<Nd2<1.65 , 40<Vd2<60, where f is the focal length of the entire optical system. The structure is simple and can guarantee good optical performance.

Further, as a specific embodiment of this solution without limitation, the focal length f3, material refractive index Nd3, and material Abbe constant Vd3 of the third lens 3 satisfy: -20<f3/f<-5, 1.55<Nd3<1.75, 15<Vd3<35, where f is the focal length of the entire optical system. The structure is simple and can guarantee good optical performance.

Further, as a specific implementation of this solution without limitation, the focal length f4, material refractive index Nd4, and material Abbe constant Vd4 of the fourth lens 4 satisfy: 2<f4/f<10, 1.75<Nd4<1.95, 15 <Vd4<40. The structure is simple and can guarantee good optical performance.

Still further, as a specific implementation of this solution without limitation, the focal length f5, material refractive index Nd5, and material Abbe constant Vd5 of the fifth lens 5 satisfy: 2<f5/f<10, 1.45<Nd5<1.65, 30 <Vd5<70, where f is the focal length of the entire optical system. The structure is simple and can guarantee good optical performance.

Furthermore, as a specific implementation of this solution without limitation, the focal length f6 of the sixth lens 6, the material refractive index Nd6, and the material Abbe constant Vd6 satisfy: 1.5<f6/f<5, 1.55<Nd6<1.75, 40 <Vd6<60, where f is the focal length of the entire optical system. The structure is simple and can guarantee good optical performance.

Further, as a specific implementation of this solution without limitation, the focal length f7, material refractive index Nd7, and material Abbe constant Vd7 of the seventh lens 7 satisfy: -5<f7/f<-1.5, 1.75<Nd7<1.95 , 15<Vd7<40, where f is the focal length of the entire optical system. The structure is simple and can guarantee good optical performance.

Still further, as a specific implementation of this solution without limitation, the material refractive index Nd8 and material Abbe constant Vd8 of the eighth lens 8 satisfy: 1.45<Nd8<1.65, 40<Vd8<60. The structure is simple and can guarantee good optical performance.

Furthermore, as a specific implementation of this solution without limitation, the sixth lens 6 and the seventh lens 7 are cemented together to form a composite lens, and the focal length f67 of the composite lens satisfies the following conditions: -500<f67<-10. The structure is simple and compact, which can guarantee good optical performance.

Specifically, the second lens 2, the third lens 3, and the eighth lens 8 are all plastic aspheric lenses, which can effectively eliminate the influence of spherical aberration on lens performance, improve the resolving power of the optical lens, and can effectively eliminate Thermal difference, while reducing the processing difficulty and production cost of the lens.

More specifically, the stop 9 of the optical system is located between the fourth lens 4 and the fifth lens 5 . The structure is simple, and it is used to adjust the intensity of the light beam. Preferably, the diaphragm 9 is disposed on one side of the fourth lens 4 , and in this embodiment, the positions of the lenses and the diaphragm are fixed.

Further, as a specific implementation manner of this solution without limitation, a band-pass filter is provided between the eighth lens 8 and the image plane 10 . The infrared light in the environment can be filtered to avoid red exposure of the image.

Specifically, in this embodiment, the focal length f of the optical system is 1.307mm, the aperture index FNo. is 2.0, the field angle 2ω=200°, the focal length f1 of the first lens 1=-13.780mm, and the second lens The focal length f2=-3.949mm of 2, the focal length f3=-22.127mm of the third lens 3, the focal length f4=9.274mm of the fourth lens 4, the focal length f5=6.184mm of the fifth lens 5, the focal length f6 of the sixth lens 6 =3.600mm, the focal length f7 of the seventh lens 7=-3.072mm, and the focal length f8 of the eighth lens 8=5.986mm. The basic parameters of the optical system are shown in the table below:

In the above table, from the object plane to the image plane along the optical axis, S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the third lens 3; S7, S8 correspond to the two surfaces of the fourth lens 4; S9 is the stop STO; S10, S11 correspond to the two surfaces of the fifth lens 5; S12, S13 correspond to the sixth lens 6 Two surfaces; S13, S14 correspond to the two surfaces of the seventh lens 7; S15, S16 correspond to the two surfaces of the eighth lens 8; S17, S18 correspond to the two surfaces of the bandpass filter; IMA is the image Surface 10.

More specifically, the surfaces of the second lens 2, the third lens 3, and the eighth lens 8 are aspherical, which satisfy the following equation: Among them, the parameter c=1/R, which is the curvature corresponding to the radius, y is the radial coordinate, and its unit is the same as the lens length unit, k is the coefficient of the conic quadratic curve, and a ₁ to a ₅ are the radial coordinates The corresponding coefficients. The S3 surface and the S4 surface of the second lens 2, the S5 surface and the S6 surface of the third lens 3, and the S15 surface and the S16 surface of the eighth lens 8 are shown in the table below:

It can be seen from FIG. 2 to FIG. 6 that the optical system in this embodiment has high resolution and very good adiabatic performance.

A camera module at least includes an optical lens, and the above-mentioned high-pixel ultra-wide-angle optical system is installed in the optical lens.

The embodiment of the utility model is mainly composed of 8 lenses and has a simple structure; different lenses are combined with each other and the focal power is reasonably distributed, and has good performances such as large aperture, large viewing angle, high pixel, and very good adiabatic difference.

The foregoing is one or more implementations provided in conjunction with specific content, and it is not considered that the specific implementation of the present utility model is limited to these descriptions. Anything similar to or identical to the method and structure of the present utility model, or some technical deduction or replacement made on the premise of the concept of the present utility model, should be regarded as the protection scope of the utility model.

Claims (10)

1. high pixel ultra-wide angle optical system is equipped with successively along optical axis from object plane to image planes：First lens, the second lens, the 3rd Lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens；It is characterized in that,

The object plane side of first lens is convex surface, and image planes side is concave surface, and focal power is negative；

The object plane side of second lens is convex surface, and image planes side is concave surface, and focal power is negative；

The object plane side of 3rd lens is concave surface, and focal power is negative；

The object plane side of 4th lens is convex surface, and focal power is just；

The object plane side of 5th lens is convex surface, and image planes side is convex surface, and focal power is just；

The object plane side of 6th lens is convex surface, and image planes side is convex surface, and focal power is just；

The object plane side of 7th lens is concave surface, and focal power is negative；

The object plane side of 8th lens is convex surface, and image planes side is convex surface, and focal power is just；

And this optical system meets TTL/EFL≤16.8, wherein, TTL be optical system the first lens object plane side vertex into The distance between image planes, EFL are the effective focal length of optical system.

2. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that each lens of the optical system are expired The following condition of foot：

(1)-15<f1<-5；

(2)-5<f2<-2；

(3)-50<f3<-10；

(4)3<f4<15；

(5)3<f5<15；

(6)2<f6<8；

(7)-10<f7<-2；

(8)2<f8<15；

Wherein, f1 is the focal length of the first lens, and f2 is the focal length of the second lens, and f3 is the focal length of the 3rd lens, and f4 is saturating for the 4th The focal length of mirror, f5 are the focal length of the 5th lens, and f6 is the focal length of the 6th lens, and f7 is the focal length of the 7th lens, and f8 is saturating for the 8th The focal length of mirror.

3. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that each lens of the optical system are expired The following condition of foot：

(1)-12<f1/f<-2；

(2)-5<f2/f<-2；

(3)-20<f3/f<-5；

(4)2<f4/f<10；

(5)2<f5/f<10；

(6)1.5<f6/f<5；

(7)-5<f7/f<-1.5；

(8)2<f8/f<10；

Wherein, f is the focal length of entire optical system, and f1 is the focal length of the first lens, and f2 is the focal length of the second lens, and f3 is the 3rd The focal length of lens, f4 are the focal length of the 4th lens, and f5 is the focal length of the 5th lens, and f6 is the focal length of the 6th lens, and f7 is the 7th The focal length of lens, f8 are the focal length of the 8th lens.

4. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that focal length f1, the material of the first lens Expect that refractive index Nd1, material Abbe constant Vd1 meet：-12<f1/f<- 2,1.72<Nd1<1.95 40<Vd1<60, wherein, f is The focal length of entire optical system.

5. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that focal length f2, the material of the second lens Expect that refractive index Nd2, material Abbe constant Vd2 meet：-5<f2/f<- 2,1.45<Nd2<1.65 40<Vd2<60, wherein, f is whole The focal length of a optical system.

6. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that focal length f3, the material of the 3rd lens Expect that refractive index Nd3, material Abbe constant Vd3 meet：-20<f3/f<- 5,1.55<Nd3<1.75 15<Vd3<35, wherein, f is The focal length of entire optical system.

7. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that focal length f4, the material of the 4th lens Expect that refractive index Nd4, material Abbe constant Vd4 meet：2<f4/f<10,1.75<Nd4<1.95 15<Vd4<40.

8. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that focal length f5, the material of the 5th lens Expect that refractive index Nd5, material Abbe constant Vd5 meet：2<f5/f<10,1.45<Nd5<1.65 30<Vd5<70, wherein, f is whole The focal length of a optical system.

9. high pixel ultra-wide angle optical system according to claim 1, which is characterized in that focal length f6, the material of the 6th lens Expect that refractive index Nd6, material Abbe constant Vd6 meet：1.5<f6/f<5,1.55<Nd6<1.75 40<Vd6<60, wherein, f is whole The focal length of a optical system.

10. camera module, including at least optical lens, which is characterized in that any one of claim 1-9 is equipped in optical lens The high pixel ultra-wide angle optical system.