CN205562935U - Super wide-angle optical system and lens for its application - Google Patents

Abstract

The embodiment of the utility model discloses super wide angle optical system includes from the object plane to image plane along the optical axis in proper order at least: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens; the focal power of the first lens is negative; the focal power of the second lens is negative; the focal power of the third lens is negative; the focal power of the fourth lens is positive; the focal power of the fifth lens is positive; the focal power of the sixth lens is negative; the focal power of the seventh lens is positive; negative of the eighth lens; the optical power of the ninth lens is positive. On the other hand, the embodiment of the utility model provides a camera lens is still provided. In the embodiment of the present invention, the optical system or the lens is composed of 9 lenses in total, the number of the lenses is small, and the structure is simple; the combination of different lenses and the reasonable distribution of focal power realize good performances of large aperture, large visual angle, high pixel and the like.

Description

Super wide-angle optical system and lens for its application

Technical field:

The utility model relates to an optical system and a lens applied thereto, in particular to an ultra-wide-angle optical system and an applied lens thereof.

Background technique:

Existing optical systems or lenses, especially ultra-wide-angle optical systems or lenses, have the defects of a large number of lenses and complex structures.

Invention content:

In order to overcome the problems of a large number of lenses and a complex structure in existing optical systems or lenses, the embodiments of the present invention provide an ultra-wide-angle optical system on the one hand.

An ultra-wide-angle optical system, which sequentially includes at least a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along an optical axis from an object plane to an image plane. lens, and a ninth 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 convex, the image plane side is concave, and its focal power is negative;

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

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

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

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

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

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

The object plane side of the ninth lens is convex, the image plane side is convex, and its refractive power is positive.

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

A lens, in which the above-mentioned super wide-angle optical system is installed.

In the embodiment of the utility model, the optical system or the lens is composed of 9 lenses in total, the number of lenses is small, and the structure is simple; the combination of different lenses and the reasonable distribution of focal power achieve good performances such as large aperture, large viewing angle, and high pixel.

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 lens of the present utility model;

Fig. 2 is the distortion curve figure of optical system of the present invention or lens at 25 ℃;

Fig. 3 is the MTF curve diagram of the optical system of the present invention or lens at 25 ℃;

Fig. 4 is the relative illuminance figure of optical system of the present utility model or lens at 25 ℃;

Fig. 5 is the MTF curve diagram of the optical system or lens of the present invention at -30°C;

FIG. 6 is an MTF curve diagram of the optical system or lens of the present invention at 80°C.

detailed description:

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, a super wide-angle optical system, along the optical axis from the object plane to the image plane 11 at least includes: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5. Sixth lens 6 , seventh lens 7 , eighth lens 8 , and ninth lens 9 .

The first lens 1 is meniscus-shaped, the object plane side is convex, the image plane side is concave, and its focal power is negative;

The second lens 2 is meniscus-shaped, the object plane side is convex, the image plane side is concave, and its focal power is negative;

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

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

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

The object plane side of the sixth lens 6 is concave, the image plane side is convex, and its focal power is negative;

The object plane side of the seventh lens 7 is a convex surface, the image plane side is a convex surface, and its refractive power is positive;

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

The object plane side of the ninth lens 9 is convex, the image plane side is convex, and its refractive power is positive.

In the embodiment of the utility model, the optical system or the lens is composed of 9 lenses in total, the number of lenses is small, and the structure is simple; the combination of different lenses and the reasonable distribution of focal power achieve good performances such as large aperture, large viewing angle, and high pixel.

Further, each lens of the optical system satisfies the following conditions:

(1)-25<f1<-5;

(2) -20<f2<-5;

(3) -20<f3<-3;

(4) 5<f4<20;

(5) 2<f5<15;

(6) -25<f6<-5;

(7) 2<f7<15;

(8)-15<f8<-1.5;

(9)2<f9<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, f8 is the focal length of the eighth lens 8, and f9 is the focal length of the ninth lens 9. Through the mutual combination of different lenses and their reasonable distribution of focal power, the optical system It has good optical properties such as large aperture, large viewing angle, and high pixel.

Still further, the fifth lens 5 and the sixth lens 6 are cemented to form a combined lens, and the combined focal length f56 satisfies: 2<f56<20. The structure is simple and compact, which can guarantee good optical performance.

Still further, the seventh lens 7 and the eighth lens 8 are cemented to form a combined lens, and the combined focal length f78 satisfies: -20<f78<-2. The structure is simple and compact, which can guarantee good optical performance.

Furthermore, the diaphragm of the optical system is located between the fourth lens 4 and the fifth lens 5 , close to the object plane side of the fifth lens 5 . The structure is simple, and it is used to adjust the intensity of the light beam.

Still further, a filter 10 is provided between the ninth lens 9 and the image plane 11 . The filter 10 can filter the infrared light in the environment, so as to avoid red exposure of the image.

Still further, the first lens to the ninth lens are all glass spherical lenses. It can effectively eliminate the influence of temperature changes on the optical system or lens, improve the environmental adaptability of the optical system or lens, and reduce the processing difficulty and production cost of the lens in the optical system or lens.

Specifically, in this embodiment, the focal length f of the optical system is 1.28 mm, the aperture index FNo. is 2.0, and the viewing angle 2ω=200°. More specifically, in this embodiment, the focal lengths of the first lens to the ninth lens are respectively f1=-15.199mm, f2=-7.818mm, f3=-6.029mm, f4=9.219mm, f5=4.230mm, f6=-9.587mm, f7=4.798mm, f8=-2.366mm, f9=4.618mm.

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 11 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 The two surfaces of the lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position of the diaphragm; S10 and S11 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the sixth lens 6; S13, S14 correspond to the two surfaces of the seventh lens 7; S14, S15 correspond to the two surfaces of the eighth lens 8; S16, S17 correspond to the two surfaces of the ninth lens 9; S18, S19 corresponds to the two surfaces of the optical filter 10; S20 corresponds to the image plane.

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 lens, in which the above-mentioned super wide-angle optical system is installed.

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 (8)

1. a ultra-wide angle optical system, the most at least includes from object plane to image planes along optical axis: the first lens, the second lens, Three lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens and the 9th lens；It is characterized in that,

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

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

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

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

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

The object plane side of described 6th lens is concave surface, and image planes side is convex surface, and its focal power is negative；

The object plane side of described 7th lens is convex surface, and image planes side is convex surface, and its focal power is just；

The object plane side of described 8th lens is concave surface, and image planes side is concave surface, and its focal power is negative；

The object plane side of described 9th lens is convex surface, and image planes side is convex surface, and its focal power is just.

Ultra-wide angle optical system the most according to claim 1, it is characterised in that each lens of this optical system meet as follows Condition:

(1)-25<f1<-5；

(2)-20<f2<-5；

(3)-20<f3<-3；

(4)5<f4<20；

(5)2<f5<15；

(6)-25<f6<-5；

(7)2<f7<15；

(8)-15<f8<-1.5；

(9)2<f9<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 the 4th saturating The focal length of mirror, f5 is 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 the 8th saturating The focal length of mirror, f9 is the focal length of the 9th lens.

Ultra-wide angle optical system the most according to claim 1, it is characterised in that described 5th lens and the 6th lens are glued Forming compound lens, a combination thereof focal distance f 56 meets: 2 < f56 < 20.

Ultra-wide angle optical system the most according to claim 1, it is characterised in that described 7th lens and the 8th lens are glued Forming compound lens, a combination thereof focal distance f 78 meets :-20 < f78 <-2.

Ultra-wide angle optical system the most according to claim 1, it is characterised in that the diaphragm of optical system is positioned at the 4th lens And between the 5th lens, near the object plane side of the 5th lens.

Ultra-wide angle optical system the most according to claim 1, it is characterised in that be provided with between described 9th lens and image planes Optical filter.

Ultra-wide angle optical system the most according to claim 1, it is characterised in that described first lens are to the 9th lens Glass spherical lens.

8. a camera lens, it is characterised in that be provided with the ultra-wide angle optical system described in any one of claim 1-7 in camera lens.