CN205539671U

CN205539671U - Tight shot device

Info

Publication number: CN205539671U
Application number: CN201620223882.2U
Authority: CN
Inventors: 段永胜
Original assignee: Suzhou Taigu Energy Management Co ltd
Current assignee: Suzhou Taigu Energy Management Co ltd; Jiangsu University
Priority date: 2016-03-22
Filing date: 2016-03-22
Publication date: 2016-08-31
Anticipated expiration: 2026-03-22

Abstract

The utility model discloses a tight shot device, include and be first lens, second lens, third lens, fourth lens, the 5th lens, VI lenses and the 7th lens in proper order to image planes along the optical axis from the object plane, first lens have negative effective focal length, and the second lens have negative effective focal length, and the positive effective focal length of third lens, fourth lens have negative effective focal length, and the 5th lens have positive effective focal length, and VI lenses has positive effective focal length, first lens are the convexo concave lens, and the second lens are the convexo concave lens, and the third lens are the biconvex lens, and the fourth lens are the biconcave lens, and the 5th lens are the biconvex lens, and VI lenses is the biconvex lens, and the 7th lens are the level crossing, aperture stop has been put between third lens and the fourth lens, first lens convex surface is towards the object plane, and the second lens are the convexo concave lens convex surface towards the object plane, and the device light transmission amount is big, it is fast to focus, and the formation of image is stable.

Description

A kind of tight shot device

Technical field

This utility model relates to a kind of optical camera lens device, refers more particularly to a kind of tight shot device.

Background technology

Tight shot (prime lens) refers in particular to the camera lens of only one of which fixed focal length, only one of which Jiao's section, only one of which in other words The visual field.Tight shot does not has zoom function.The design of tight shot is simply too much relative to for zoom lens, but general zoom Imaging can have been affected in zooming procedure by camera lens, and tight shot is focused speed exactly relative to the largest benefit of zoom machine Hurry up, image quality is stable.Much have the moving object image captured by the digital camera of tight shot clearly to stablize, focusing Very accurate, picture is fine and smooth, and granular sensation is very slight, and light-metering is also the most accurately.

The design of tight shot is simply too much relative to for zoom lens, but general zoom lens in zooming procedure to imaging meeting Having affected, and tight shot is fast relative to the largest benefit of zoom machine speed of focusing exactly, image quality is stable, the suitableeest Closing large-scale landscape photography, large-scale collective's group photo is taken pictures the benefit of tight shot.

The Radix Rumicis focused or standard lens are general all big than the zoom lens bore containing respective focal section, and focusing wide angle camera lens is general All little than the zoom lens volume containing respective focal section, lightweight.

This utility model provides that a kind of logical light quantity is big, focusing speed is fast, the tight shot device of image stabilization.

Utility model content

This utility model provides that a kind of logical light quantity is big, focusing speed is fast, image stabilization, the tight shot device distorting little.

Realize of the present utility model by following technical solution:

A kind of tight shot device, including from object plane to image planes along optical axis be followed successively by the first lens, the second lens, the 3rd lens, 4th lens, the 5th lens, the 6th lens and the 7th lens；

Described first lens have negative effective focal length, and the second lens have a negative effective focal length, the effective focal length that the 3rd lens are positive, 4th lens have negative effective focal length, and the 5th lens have positive effective focal length, and the 6th lens have positive effective focal length；

Described first lens are convexoconcave lens, and the second lens are convexoconcave lens, and the 3rd lens are biconvex lens, and the 4th lens are double Concavees lens, the 5th lens are biconvex lens, and the 6th lens are biconvex lens, and the 7th lens are plane mirror；

It is equipped with aperture diaphragm between described 3rd lens and the 4th lens；

Described first convex lens surface is towards object plane, and the second lens are that convexoconcave lens is convex surface facing object plane.

Further, described first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are Spherical lens.

Further, described first lens can move to the second lens direction, and the second lens maintain static.

Further, described 3rd lens effective focal length and fix-focus lens camera lens overall length ratio meet relationship below:

0.2 ＜ | f₃/ TT | ＜ 0.6

In formula: f₃Represent is the effective focal length of the 3rd lens, and TT is fix-focus lens overall length.

Further, described first lens and the effective focal length of the second lens and F_effFor tight shot effective focal length ratio meet with Lower relational expression:

0.5 ＜ | F_eff/f₁₂| ＜ 1.2

In formula: f₁₂It is the effective focal length of the first lens (T1) and the second lens (T2), F_effEffective focal length for tight shot.

Further, described 4th lens and the 5th lens are double glued spherical lens.

Beneficial effect:

1. tight shot is not owing to having the demand of zoom, and lens structure is the most fairly simple, can reduce light in camera lens The possibility of diffraction, it is provided that apparent sharp keen image, owing to having large aperture, focuses mirror and relatively becomes in the environment that light is more weak For burnt mirror, still can absorb better light tight shot due to lens construction relatively easy, except some outfits are floating type The wide-angle lens of autofocus system have outside mirror group, the mirror group that can not move in general lens construction.

2. this tight shot device is often less than what zoom lens came in size and weight, carries with and also compares Convenient.

3. this tight shot device is for zoom lens, the zoom lens that tight shot imaging opposed configuration is more complicated Saying, the image distortion shooting out under same burnt section is smaller.

4. this focus fixing device light weight, low cost, good imaging quality, optical system total length is little and has less distortion, Good image quality.

Accompanying drawing explanation

Accompanying drawing 1 is a kind of tight shot apparatus structure schematic diagram；

Accompanying drawing 2 is that error function is to tight shot Optimizing Flow figure；

Accompanying drawing 3 is the schematic diagram of the longitudinal spherical aberration of fixed-focus system；

Accompanying drawing 4 is the schematic diagram of position dispersion in fixed-focus system；

Accompanying drawing 5 is the distortion schematic diagram of fixed-focus system position.

Reference is expressed as:

T1-the first lens；T2-the second lens；T3-the 3rd lens；T4-the 4th lens；T5-the 5th lens；T6-the 6th lens； T7-the 7th lens.

Detailed description of the invention

Illustrate in conjunction with accompanying drawing in order to this utility model is further described:

In conjunction with accompanying drawing 1, a kind of tight shot device, including from object plane to image planes along optical axis be followed successively by the first lens (T1), second Lens T2, the 3rd lens T3, the 4th lens T4, the 5th lens T5, the 6th lens T6 and the 7th lens T7；

Described first lens T1 has negative effective focal length, and the second lens T2 has negative effective focal length, and the 3rd lens T3 is just Effective focal length, the 4th lens T4 has negative effective focal length, and the 5th lens T5 has positive effective focal length, the 6th lens T6 There is positive effective focal length；

Described first lens T1 is convexoconcave lens, and the second lens T2 is convexoconcave lens, and the 3rd lens are biconvex lens, and the 4th is saturating Mirror is biconcave lens, and the 5th lens are biconvex lens, and the 6th lens are biconvex lens, and the 7th lens T7 is plane mirror；

It is equipped with aperture diaphragm between described 3rd lens T3 and the 4th lens T4；

Described first lens T1 is convex surface facing object plane, and the second lens T2 is that convexoconcave lens is convex surface facing object plane.

Described first lens T1, the second lens T2, the 3rd lens T3, the 4th lens T4, the 5th lens T5 and the 6th lens T6 is spherical lens.

Described 3rd lens T3 effective focal length and fix-focus lens camera lens overall length ratio meet relationship below:

0.2 ＜ | f₃/ TT | ＜ 0.6

In formula: f₃Represent is the effective focal length of the 3rd lens T3, and TT is fix-focus lens overall length.

Described first lens T1 and the effective focal length of the second lens T2 and F_effFor tight shot effective focal length ratio meet below Relational expression:

0.5 ＜ | F_eff/f₁₂| ＜ 1.2

In formula: f₁₂It is the first lens T1 and the effective focal length of the second lens T2, F_effEffective focal length for tight shot.

Described 4th lens T4 and the 5th lens T5 is double glued spherical lens.

In conjunction with accompanying drawing 2, error function is to tight shot Optimizing Flow, thus is optimized tight shot parameters, obtains Optimal parameter.

In conjunction with accompanying drawing 3, the longitudinal direction of the longitudinal spherical aberration system of fixed-focus system ask difference be according to image planes light beam wavelength be 587nm be survey Amount.In diagram, the longitudinal spherical aberration of wide-angle side is less than 0.1mm, it can be seen that this system exists axial chromatic aberration, but value of chromatism is the least.

In conjunction with accompanying drawing 4, be represent in fixed-focus system the dispersion of position dispersion system be according to image planes light beam when wavelength is 587Nm Measuring, wherein S and T represents the curvature of field of sagitta of arc direction and meridian direction respectively.In diagram, wide-angle side is curve S and T Excursion is between-0.05mm-0.05mm.

In conjunction with accompanying drawing 5, representing that the distortion of the distortion system of fixed-focus system position is is that 587nm is according to image planes light beam at wavelength Measure.In diagram, during wide-angle side, curvilinear motion scope is between-15%-0%.

Every lens data parameter of table 1CODEV software programming gained

The structural parameters of each lens face and radius, thickness, material therefor glass and refractive Iy from object plane to image planes.

Utilize CODE V to use error function (CODE V error function) that camera lens is quantized to obtain, system optimization After draw camera lens single order data are as shown in the table:

Effective focal length	12.5663
		Front focal length	-0.1254
Back focal length	13.4525
		F number	1.8000
Total length	67.4958
		Angle	23.54

Described embodiment is that of the present utility model preferred embodiment but this utility model is not limited to above-mentioned embodiment, In the case of flesh and blood of the present utility model, those skilled in the art can make any conspicuously improved, Replace or modification belongs to protection domain of the present utility model.

Claims

1. a tight shot device, it is characterised in that include from object plane to image planes along optical axis be followed successively by the first lens (T1), Second lens (T2), the 3rd lens (T3), the 4th lens (T4), the 5th lens (T5), the 6th lens (T6) and the 7th Lens (T7)；

Described first lens (T1) have negative effective focal length, and the second lens (T2) have negative effective focal length, the 3rd lens (T3) positive effective focal length, the 4th lens (T4) have negative effective focal length, and the 5th lens (T5) have positive effective Jiao Away from, the 6th lens (T6) have positive effective focal length；

Described first lens (T1) are convexoconcave lens, and the second lens (T2) are convexoconcave lens, and the 3rd lens are biconvex lens, 4th lens are biconcave lens, and the 5th lens are biconvex lens, and the 6th lens are biconvex lens, and the 7th lens (T7) are plane Mirror；

It is equipped with aperture diaphragm between described 3rd lens (T3) and the 4th lens (T4)；

Described first lens (T1) are convex surface facing object plane, and the second lens (T2) are that convexoconcave lens is convex surface facing object plane.

Tight shot device the most according to claim 1, it is characterised in that described first lens (T1), the second lens (T2), the 3rd lens (T3), the 4th lens (T4), the 5th lens (T5) and the 6th lens (T6) are spherical lens.

Tight shot device the most according to claim 1, it is characterised in that described first lens (T1) can be to second Lens (T2) direction is moved, and the second lens (T2) maintain static.

Tight shot the most according to claim 1, it is characterised in that described 3rd lens (T3) effective focal length with focus Lens overall length ratio meets relationship below:

0.2 ＜ | f₃/ TT | ＜ 0.6

In formula: f₃Represent is the effective focal length of the 3rd lens (T3), and TT is fix-focus lens overall length.

Tight shot device the most according to claim 1, it is characterised in that described first lens (T1) and the second lens (T2) effective focal length and F_effRelationship below is met for the effective focal length ratio of tight shot:

0.5 ＜ | F_eff/f₁₂| ＜ 1.2

6. according to the tight shot device described in any one of claims 1 to 3, it is characterised in that described 4th lens (T4) It is double glued spherical lens with the 5th lens (T5).