CN208076813U - A kind of big visual field, high image quality, small distortion optical imaging system - Google Patents
A kind of big visual field, high image quality, small distortion optical imaging system Download PDFInfo
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- CN208076813U CN208076813U CN201820161549.2U CN201820161549U CN208076813U CN 208076813 U CN208076813 U CN 208076813U CN 201820161549 U CN201820161549 U CN 201820161549U CN 208076813 U CN208076813 U CN 208076813U
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Abstract
The utility model is related to a kind of big visual field, high image quality, small distortion optical imaging system, it is characterised in that：From object plane (12) to being disposed with the first lens (1) sensitive film (10),Second lens (2),The third lens (3),4th lens (4),5th lens (5),6th lens (6),7th lens (7),8th lens (8),Optical filter (9),Diaphragm (11) is equipped between the third lens (3) and the 4th lens (4),First lens (1),5th lens (5),6th lens (6),8th lens (8) are negative focal length lens,Second lens (2),The third lens (3),4th lens (4),7th lens (7) are positive focal length lens,The optical imaging system realizes big visual field,High image quality,Small distortion imaging,Big view field imaging can be met and the small requirement that distorts,It can be used for video conference and field of taking photo by plane.
Description
【Technical field】
The utility model patent be related to a kind of big visual field, high image quality, small distortion optical imaging system, more particularly to it is a kind of
The optical imaging system of big visual field, high image quality, the big visual field of small distortion, high image quality, small distortion in terms of applied to video conference.
【Background technology】
Optical system (optical system) refer to by a variety of optical elements such as lens, speculum, prism and diaphragm by
The system that one graded is combined into.Commonly used to be imaged or do optical Information Processing.The center of curvature on the same line two
Or the optical system of more than two refraction (or reflection) spherical surface compositions is known as coaxial spherical system, where the center of curvature is straight
Line is known as optical axis.
One optical system is in addition to the relevant issues of first-order theory to be considered, such as object-image conjugate position, magnifying power, image rotation
Other than turnover light path etc., also need to consider the size of areas imaging, the size of imaging beam angular aperture, imaging band width with
And picture clarity and illumination a series of problems, such as.A series of actual optical system for meeting requirements is frequently not several lens
Simple combination, and be made of a series of a variety of optical elements such as lens, curved reflector, plane mirror, reflecting prism and graticle,
And it can just be obtained by the way that the means such as diaphragm, fine correction aberration and the appropriate lateral dimension for determining optical element are rationally arranged
Desirable high-quality system.
Diaphragm is the optical element to provide constraints to the light beam by optical system.It can be optical element (lens,
Speculum etc.) frame of itself, it can also be opaque screen with holes set in addition.Diaphragm center usually on optical axis, and with light
Axis is vertical.
Video signal camera lens used at present is there are some drawbacks, and most visual field is small, image quality is poor, distortion is larger, and shooting picture is not
Real scene can be presented authentic and validly.
Since there are the above problems, it is necessary to propose solution to it, the utility model is exactly in this context
It makes.
【Utility model content】
The technical problem to be solved by the utility model is to the deficiency in for the above-mentioned prior art, provides and a kind of regard greatly
Field, high image quality, small distortion optical imaging system, the big visual field, high image quality, small distortion optical imaging system realize and regard greatly
Field, high image quality, small distortion imaging can meet big view field imaging and the small requirement that distorts, can be used for video conference and neck of taking photo by plane
Domain.
To achieve the above object, the utility model uses following technical proposals：
A kind of big visual field, high image quality, small distortion optical imaging system, set successively from object plane 12 to sensitive film 10
It is equipped with the first lens 1, the second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7,
Eight lens 8, optical filter 9, between the third lens 3 and the 4th lens 4 be equipped with diaphragm 11, first lens 1,
5th lens 5, the 6th lens 6, the 8th lens 8 be negative focal length lens, second lens 2, the third lens 3, the 4th lens 4,
7th lens 7 are positive focal length lens.
The focal length of first lens 1 as described above is f1, and the focal length of second lens 2 is f2, the coke of the third lens 3
It is f4 away from the focal length for f3, the 4th lens 4, the focal length of the 5th lens 5 is f5, and the focal length of the 6th lens 6 is
F6, the focal lengths of the 7th lens 7 are f7, and the focal lengths of the 8th lens 8 is f8, focal length f1, f2, f3, f4, f5, f6, f7,
Meet relational expression between f8：-5<f1/f2<0,0<f3/f4<5,0<f5/f6<5, -5<f7/f8<0.
The abbe number of first lens 1 as described above is lens1, and the abbe number of second lens 2 is lens2, institute
The abbe number for stating the third lens 3 is lens 3, and the abbe number of the 4th lens 4 is lens4, the 5th lens 5
Abbe number is lens5, and the abbe number of the 6th lens 6 is lens6, and the abbe number of the 7th lens 7 is
The abbe number of lens7, the 8th lens 8 are lens8, are met between lens achromatic coefficient：Vd (lens1, lens3, lens4,
Lens6, lens7) >=45；Vd (lens2, lens5, lens8)≤40.
First lens 1 as described above while image planes are spherical surface towards object side, 2 direction of the second lens
Object side one side be convex it is aspherical, towards image planes one side be concave it is aspherical, the third lens 3 towards object side one side and
It is spherical surface on one side towards image planes, the 4th lens 4 while image planes are that convex is aspherical towards object side,
5th lens 5 and the 6th lens 6 are glued construction, and the 7th lens 7 are aspherical towards one face concave of object side, court
It is that convex is aspherical to image planes one side, the 8th lens 8 are that convex is aspherical towards object side one side, are recessed towards image planes one side
Type is aspherical.
One curvature radius of the first lens 1 as described above towards the object plane 12 is more than 20,1 direction of the first lens
One curvature radius of sensitive film 10 is less than 10.
It is as described above second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5, described
6th lens 6 be spherical lens, first lens 1, the 7th lens 7 and the 8th lens 8 aspherical table
Face shape meets equation：
In formula, parameter c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y, and k is circular cone
Whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k coefficients are equal to -1, the face of lens
Shape curve is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, when k-factor is equal to 0, thoroughly
The face shape curve of mirror is circle, and when k coefficients are more than 0, the face shape curve of lens is oblateness；α1To α8Each radial direction is indicated respectively
Coefficient corresponding to coordinate.
The utility model has the beneficial effects that：
1, in the optical texture of the utility model, the focal length of the first lens 1 is f1, and the focal length of the second lens 2 is f2, third
The focal length of lens 3 is f3, and the focal length of the 4th lens 4 is f4, and the focal length of the 5th lens 5 is f5, and the focal length of the 6th lens 6 is f6,
The focal length of 7th lens 7 is f7, and the focal length of the 8th lens 8 is f8, is met：-5<f1/f2<0,0<f3/f4<5,0<f5/f6<
5, -5<f7/f8<0, distortion can be effectively compressed.
2, in the optical texture of the utility model, the abbe number of the first lens 1 is lens1, the dispersion system of the second lens 2
Number is lens2, and the abbe number of the third lens 3 is lens 3, and the abbe number of the 4th lens 4 is lens4, the 5th lens 5
Abbe number is lens5, and the abbe number of the 6th lens 6 is lens6, and the abbe number of the 7th lens 7 is lens7, and the 8th thoroughly
The abbe number of mirror 8 is lens8, is met between lens：
Vd (lens1, lens3, lens4, lens6, lens7) >=45；
Vd (lens2, lens5, lens8)≤40.
This collocation can effectively reduce aberration, to realize center high-resolution.
3, the utility model can realize big visual field, high image quality, low distortion camera shooting.
4, the utility model uses one group of cemented doublet and carrys out achromatism.
5, second lens of the utility model and the 4th lens are all made of Glass aspheric, and the 7th lens and the 8th lens are equal
It is aspherical using plastic cement, be conducive to the correction of aberration, can effectively reduce the chief ray angle of system.Reasonable disposition more than utilization
Combination, solves the problems, such as to be difficult to realize high-resolution and low distortion under big visual field.
6, the optical distortion of the utility model is less than 5% under full filed, and aberration control meets in very small range
Requirement of the video conference to distortion.
【Description of the drawings】
Fig. 1 is the schematic diagram of the utility model.
Fig. 2 is the light path schematic diagram of the utility model.
【Specific implementation mode】
Further detailed description is done to the utility model below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 2, a kind of big visual field, high image quality, small distortion optical imaging system, from object plane 12 to photosensitive
The first lens 1, the second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5, the 6th lens are disposed between piece 10
6, the 7th lens 7, the 8th lens 8, optical filter 9 are equipped with diaphragm 11, institute between the third lens 3 and the 4th lens 4
It is negative focal length lens, second lens 2, the third lens to state the first lens 1, the 5th lens 5, the 6th lens 6, the 8th lens 8
3, the 4th lens 4, the 7th lens 7 be positive focal length lens, the big visual field, high image quality, small distortion optical imaging system realize
The high image quality imaging of the small distortion of big field angle, can be used for the fields such as video conference.
As shown in Figure 1 and Figure 2, in the present embodiment, the focal length of first lens 1 is f1, the coke of second lens 2
It is f3 away from the focal length for f2, the third lens 3, the focal length of the 4th lens 4 is f4, and the focal length of the 5th lens 5 is
The focal length of f5, the 6th lens 6 are f6, and the focal length of the 7th lens 7 is f7, and the focal length of the 8th lens 8 is f8, burnt
Away from meeting relational expression between f1, f2, f3, f4, f5, f6, f7, f8：-5<f1/f2<0,0<f3/f4<5,0<f5/f6<5, -5<
f7/f8<0, distortion can be effectively compressed.
As shown in Figure 1 and Figure 2, in the present embodiment, the abbe number of first lens 1 is lens1, and described second thoroughly
The abbe number of mirror 2 is lens2, and the abbe number of the third lens 3 is lens 3, the abbe number of the 4th lens 4
For lens4, the abbe number of the 5th lens 5 is lens5, and the abbe number of the 6th lens 6 is lens6, described the
The abbe number of seven lens 7 is lens7, and the abbe number of the 8th lens 8 is lens8, is met between lens achromatic coefficient：vd
(lens1, lens3, lens4, lens6, lens7 >=45；Vd (lens2, lens5, lens8)≤40, this collocation can be effective
Reduce aberration, to realize center high-resolution.
As shown in Figure 1 and Figure 2, in the present embodiment, first lens 1 are equal while image planes towards object side
For spherical surface, second lens 2 are that convex is aspherical towards object side one side, are that concave is aspherical towards image planes one side, the institute
It while image planes is spherical surface that the third lens 3, which are stated, towards object side, and the 4th lens 4 are towards object side one side and direction
Image planes are that convex is aspherical on one side, and the 5th lens 5 and the 6th lens 6 are glued construction, 7 court of the 7th lens
It is aspherical to one face concave of object side, it is that convex is aspherical towards image planes one side, the 8th lens 8 are convex on one side towards object side
It is aspherical, it is that concave is aspherical towards image planes one side.
As shown in Figure 1 and Figure 2, in the present embodiment, it is equipped with optical filter 9 towards the side of image planes in the 8th lens 8,
Light is entered from optical filter 9, it is contemplated that when being applied to lens imaging, can use CMOS sensitive chips, optical filter is to photosensitive
Chip has certain protective effect, while also filtering a part of light to reduce veiling glare, keeps image color beautiful and sharp keen same
When have good color reducibility.
As shown in Figure 1 and Figure 2, in the present embodiment, a curvature radius of first lens 1 towards the object plane 12
More than 20, a curvature radius of first lens 1 towards image planes is less than 10.
First lens 1 while image planes are spherical surface towards object side.For controlling object space angle of incidence of light simultaneously
Reduce image deformation.
Second lens 2 are that convex is aspherical towards object side one side, are that concave is aspherical towards image planes one side.It can control
Change in refraction angle of the light processed between each lens.
The third lens 3 while image planes are spherical surface towards object side.
4th lens 4 while image planes are that convex is aspherical towards object side.
5th lens 5 and the 6th lens 6 are glued construction；By the different high low-refraction of model and Abbe number difference
Larger glass material is made, and can be compensated to aberration.
7th lens 7 are aspherical towards one face concave of object side, are that convex is aspherical towards image planes one side.
8th lens 8 are that convex is aspherical towards object side one side, are that concave is aspherical towards image planes one side.It can subtract
Small image planes chief ray angle reduces imaging aberration.
It is equipped with diaphragm 11 between the third lens 3 and the 4th lens 4, the aperture of light transmission can be controlled so that at
As picture entirety is uniform.
As shown in Figure 1 and Figure 2, in the present embodiment, a curvature radius of first lens 1 towards the object plane 12
More than 20, a curvature radius of first lens 1 towards sensitive film 10 is less than 10.
As shown in Figure 1 and Figure 2, in the present embodiment, second lens 2, the third lens 3, institute
It is spherical lens, first lens to state the 4th lens 4, the 5th lens 5, the 6th lens 6
1, the aspherical surface shape of the 7th lens 7 and the 8th lens 8 meets equation：In formula, ginseng
Number c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y, and k is circular cone system of conics
Number；When k-factor is less than -1, the face shape curve of lens is hyperbola, and when k-factor is equal to -1, the face shape curve of lens is to throw
Object line；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, and when k-factor is equal to 0, the face shape of lens is bent
Line is circle, and when k-factor is more than 0, the face shape curve of lens is oblateness；α1To α8It indicates respectively corresponding to each radial coordinate
Coefficient.
Claims (6)
1. a kind of big visual field, high image quality, small distortion optical imaging system, it is characterised in that：From object plane (12) to sensitive film
(10) the first lens (1), the second lens (2), the third lens (3), the 4th lens (4), the 5th lens are disposed between
(5), the 6th lens (6), the 7th lens (7), the 8th lens (8), optical filter (9), in the third lens (3) and the described 4th
Diaphragm (11) is equipped between lens (4), first lens (1), the 5th lens (5), the 6th lens (6), the 8th lens (8) are
Negative focal length lens, second lens (2), the third lens (3), the 4th lens (4), the 7th lens (7) are positive focal length lens.
2. big visual field according to claim 1, high image quality, small distortion optical imaging system, it is characterised in that：Described
The focal length of one lens (1) is f1, and the focal length of second lens (2) is f2, and the focal length of the third lens (3) is f3, described
The focal length of 4th lens (4) is f4, and the focal length of the 5th lens (5) is f5, and the focal length of the 6th lens (6) is f6, institute
The focal length for stating the 7th lens (7) is f7, and the focal length of the 8th lens (8) is f8, focal length f1, f2, f3, f4, f5, f6, f7, f8
Between meet relational expression：-5<f1/f2<0,0<f3/f4<5,0<f5/f6<5, -5<f7/f8<0.
3. big visual field according to claim 1, high image quality, small distortion optical imaging system, it is characterised in that：Described
The abbe number of one lens (1) is lens1, and the abbe number of second lens (2) is lens2, the third lens (3)
Abbe number is lens 3, and the abbe number of the 4th lens (4) is lens4, and the abbe number of the 5th lens (5) is
The abbe number of lens5, the 6th lens (6) are lens6, and the abbe number of the 7th lens (7) is lens7, described
The abbe number of 8th lens (8) is lens8, is met between lens achromatic coefficient：Vd (lens1, lens3, lens4, lens6,
lens7)≥45；Vd (lens2, lens5, lens8)≤40.
4. big visual field according to claim 1, high image quality, small distortion optical imaging system, it is characterised in that：Described
One lens (1) while image planes are spherical surface towards object side, second lens (2) towards object side one side be convex
It is aspherical, it is that concave is aspherical towards image planes one side, the third lens (3) are while image planes towards object side
Spherical surface, the 4th lens (4) while image planes are that convex is aspherical towards object side, the 5th lens (5)
And the 6th lens (6) are glued construction, the 7th lens (7) are aspherical towards one face concave of object side, towards image planes one
Face is that convex is aspherical, and the 8th lens (8) are that convex is aspherical towards object side one side, are concave aspheric towards image planes one side
Face.
5. big visual field according to claim 1, high image quality, small distortion optical imaging system, it is characterised in that：Described
One curvature radius of one lens (1) towards the object plane (12) is more than 20, and first lens (1) are towards sensitive film (10)
One curvature radius is less than 10.
6. big visual field according to claim 1, high image quality, small distortion optical imaging system, it is characterised in that：Described
Two lens (2), the third lens (3), the 4th lens (4), the 5th lens (5), the 6th lens (6) are ball
Face lens, first lens (1), the 7th lens (7) and the 8th lens (8) aspherical surface shape satisfaction side
Journey：Z=cy2/ In formula
In, parameter c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y, and k is the secondary song of circular cone
Linear system number；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor is equal to -1, the face shape curve of lens
For parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, when k-factor is equal to 0, the face of lens
Shape curve is circle, and when k-factor is more than 0, the face shape curve of lens is oblateness；α1To α8Each radial coordinate institute is indicated respectively
Corresponding coefficient.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI674432B (en) * | 2019-02-01 | 2019-10-11 | 大立光電股份有限公司 | Optical photographing lens assembly, image capturing unit and electronic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI674432B (en) * | 2019-02-01 | 2019-10-11 | 大立光電股份有限公司 | Optical photographing lens assembly, image capturing unit and electronic device |
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