CN109143532A - A kind of large aperture silent frame industrial lens - Google Patents

Abstract

This patent discloses a kind of large aperture silent frame industrial lens, belong to field of optical.Camera lens uses nine optical glass lens altogether, the successively rear lens group including the front lens group of positive light coke, adjustable diaphragm and positive light coke from the object side to the image side, by reasonable distribution optical system focal power and it is aided with the application of glass of high refractive index material, effectively balance the optical aberrations such as spherical aberration, color difference, have the characteristics that low distortion, large aperture, close-shot work well, can be applied to have the characteristics that the industrial detection application field that breadth is wide, speed is fast, precision is high.

Description

A kind of large aperture silent frame industrial lens

Technical field

This patent belongs to field of optical, is related to a kind of large aperture silent frame industrial lens, mainly can allow line Perhaps slr camera can be widely applied to industrial detection or Professional Photography aspect to scanning industrial camera.

Background technique

Recently as the continuous development of industrial automation, the degree of automation of production line is higher and higher, especially manufactures The industrial lens demand of big target surface high-quality is continuously increased in terms of product testing in industry.Such as LCD panel detection, print Brushware, grain screening and removing foreign material from tobacco etc. have the characteristics that the detection application neck that breadth is wide, speed is fast, precision is high Domain.

It can be used for its close-shot effect of camera lens of big target surface line scanning industrial camera on the market at present there are also to be hoisted, it is still insufficient To be applied to the detection occasion of high-precision, high-quality.

Summary of the invention

The purpose of this patent is to design the silent frame industrial lens of a kind of object lens of large relative aperture, low distortion, can be applied to have There is the detection application field for the features such as breadth is wide, speed is fast, precision is high.Specifically, the relative aperture of this patent camera lens is 1: 1.8, optical distortion is 2% hereinafter, resolution ratio is 6,000,000 or more when camera lens is applied to silent frame camera.

To achieve the above object, this patent the technical solution adopted is that:

A kind of large aperture silent frame industrial lens, from the object side to the image side successively including positive light coke front lens group G1, can The rear lens group G2 of light modulation door screen and positive light coke.The focal length ratio range of the front lens group G1 and rear lens group G2 meet with Lower condition: 0.8 < fG1/fG2 < 2.5, fG1 and fG2 respectively represent the focal length of front lens group and rear lens group.

The front lens group G1 successively includes: negative power curved month type the first lens L1, negative light focus from the object side to the image side The second lens of curved month type L2 is spent, positive light coke biconvex the third lens L3, the 4th lens L4 of positive light coke curved month type, wherein third is saturating Mirror L3 and the 4th lens L4 are glued.

The rear lens group G2 successively includes: the 5th lens L5 of negative power concave-concave, negative power from the object side to the image side The 6th lens L6 of curved month type, the 7th lens L7 of positive light coke biconvex, the 8th lens L8 of positive light coke, positive light coke biconvex the 9th are saturating Mirror L9, wherein the 6th lens L6 and the 7th lens L7 are glued.

For the adjustable diaphragm between front lens group G1 and rear lens group G2, clear aperture is adjustable, makes camera lens Relative aperture can be changed as use occasion changes, change the size of light passing amount, the aperture of camera lens is made to match the occasion used.

Focal length, refractive index and the Abbe number of nine optical lenses in this patent optical lens meet the following conditions:

-150<f1<-105	1.52<n1<1.57	55.3<v1<62.4
			-90<f2<-70	1.47<n2<1.52	68.5<v2<73.5
35<f3<45	1.78<n3<1.85	40.2<v3<45.3
			126<f4<135	1.67<n4<1.72	28.3<v4<31.2
-35<f5<-25	1.61<n5<1.66	30.7<v5<35.2
			-385<f6<-336	1.83<n6<1.87	40.2<v6<45.3
62<f7<70	1.63<n7<1.68	53.2<v7<57.6
			70<f8<78	1.78<n8<1.85	40.2<v8<45.3
75<f9<85	1.78<n9<1.85	40.2<v9<45.3

Here ni indicates the refractive index of i-th of lens, and vi indicates the Abbe number of i-th of lens, and i-th of fi expression saturating The focal length of mirror, unit mm, i=1,2,3 ... 9.

Implementation through the above scheme makes entire optical system focal length 35mm, and full filed angle is 62.4 °, relative aperture It is 1/1.8, it is 43mm that circle target surface diameter, which is imaged,.By carrying out reasonable focal power distribution, balance to optical system when design Spherical aberration and color difference when large aperture, and the glass material that high refractive index is used for multiple times further decreases the height of optical system generation Grade aberration, makes optical system have good imaging effect, especially improves close-shot effect.

Detailed description of the invention

Attached drawing 1 is this patent optical system structure figure

Attached drawing 2 is that this patent optical system passes letter figure

Attached drawing 3 is this patent mechanical-optical setup schematic diagram

Specific embodiment

Attached a kind of large aperture silent frame industrial lens shown in FIG. 1, by front lens group G1, adjustable diaphragm and rear lens group G2 Composition.By reasonably distributing the focal power of front and back lens group, the various aberrations based on spherical aberration are in each eyeglass of front and back lens group Between be relatively evenly distributed, avoid individual lenses undertake build-up tolerance caused by larger focal power sensitivity.Front lens group G1 is with after The focal length ratio range of lens group G2 meets the following conditions: 0.8 < fG1/fG2 < 2.5, fG1 and fG2 respectively represent front lens group and The focal length of rear lens group.

The front lens group G1 successively includes: negative power curved month type the first lens L1, negative light focus from the object side to the image side The second lens of curved month type L2 is spent, positive light coke biconvex the third lens L3, the 4th lens L4 of positive light coke curved month type, wherein third is saturating Mirror L3 and the 4th lens L4 are glued；Wherein the first lens L1 abuts third by spacer ring against the second lens L2, the second lens L2 Lens L3 assembly.

The rear lens group G2 successively includes: the 5th lens L5 of negative power concave-concave, negative power from the object side to the image side The 6th lens L6 of curved month type, the 7th lens L7 of positive light coke biconvex, the 8th lens L8 of positive light coke, positive light coke biconvex the 9th are saturating Mirror L9, wherein the 6th lens L6 and the 7th lens L7 are glued.5th lens L5 abuts the 6th lens, and the 7th lens L7 passes through spacer ring With the 8th L8 lens by being closely assembled, the 8th lens L8 is by spacer ring with the 9th lens L9 by being closely assembled.

Wherein, the first lens L1 and the second lens L2 of the front lens group G1 uses negative-power lenses, makes to regard outside axis Field light is gradually reduced after this two panels lens with the angle of optical axis, then the lens at rear are refracted into lesser incidence angle, Reduce the off-axis aberration of system.Use the glue pellet with larger refringence and abbe number difference into one in optics simultaneously Walk reduction system spherical aberration and color difference.The 5th lens L5 of the rear lens group G2 reduces astigmatism by the way of bending towards diaphragm, and And using two pieces of positive power lens L8 and L9 are increased while glue pellet again, the senior aberration of system generation is further decreased.

Focal length, refractive index and the Abbe number of nine optical lenses of the front lens group G1 and rear lens group G2 meet The following conditions:

-150<f1<-105	1.52<n1<1.57	55.3<v1<62.4
			-90<f2<-70	1.47<n2<1.52	68.5<v2<73.5
35<f3<45	1.78<n3<1.85	40.2<v3<45.3
			126<f4<135	1.67<n4<1.72	28.3<v4<31.2
-35<f5<-25	1.61<n5<1.66	30.7<v5<35.2
			-385<f6<-336	1.83<n6<1.87	40.2<v6<45.3
62<f7<70	1.63<n7<1.68	53.2<v7<57.6
			70<f8<78	1.78<n8<1.85	40.2<v8<45.3
75<f9<85	1.78<n9<1.85	40.2<v9<45.3

Here ni indicates the refractive index of i-th of lens, and vi indicates the Abbe number of i-th of lens, and i-th of fi expression saturating The focal length of mirror, unit mm, i=1,2,3 ... 9.

The optics rear cut-off distance of the patent is greater than 39mm, and the Interface design of camera lens and camera is F bayonet.

The following are one embodiment of this patent, the optical data of camera lens is as follows:

Face serial number	R	d	n	v
					1	36.12	2	1.55	58.9
2	22.46	7.2
					3	119.01	1.67	1.49	70.4
4	29.21	16.78
					5	42.04	9.23	1.83	42.7
6	-33.77	2.08	1.71	30.1
					7	-200.01	14.42
Diaphragm	Infinity	5.01
					9	-24.15	1.75	1.66	32.2
10	91.7	0.6
					11	662.25	1.27	1.85	23.8
12	47.02	4.98	1.66	55.3
					13	-33.84	0.2
14	-297.03	3.19	1.83	42.7
					15	-51.4	2
16	297.03	3.58	1.83	42.7
					17	-90.16	40.3

Here, R indicates the radius of curvature of corresponding mirror surface, and d indicates center thickness or the airspace of corresponding eyeglass, and n is indicated The refractive index of corresponding eyeglass, v indicate the Abbe number of corresponding eyeglass.

The above is only a kind of preferred embodiment of the art of this patent, does not constitute the restriction to the art of this patent, Any modification, the replacement etc. made on all bases of the technical solution described in this patent, should all fall into the protection scope of this patent Within.

Claims (4)

1. a kind of large aperture silent frame industrial lens, the successively front lens group G1 including positive light coke, adjustable from the object side to the image side The focal length ratio range of the rear lens group G2, the front lens group G1 and rear lens group G2 of diaphragm and positive light coke meet following Condition: 0.8 < fG1/fG2 < 2.5, fG1 and fG2 respectively represent the focal length of front lens group and rear lens group.

2. a kind of large aperture silent frame industrial lens according to right 1, it is characterised in that: the front lens group G1 is from object Side successively includes negative power curved month type the first lens L1, negative power curved month type the second lens L2, positive light coke to image space Biconvex the third lens L3, the 4th lens L4 of positive light coke curved month type, wherein the third lens L3 and the 4th lens L4 are glued.

3. a kind of large aperture silent frame industrial lens according to right 1, it is characterised in that: the rear lens group G2 is from object Side successively includes the 5th lens L5 of negative power concave-concave, the 6th lens L6 of negative power curved month type, positive light coke pair to image space Convex 7th lens L7, the 8th lens L8 of positive light coke, the 9th lens L9 of positive light coke biconvex, wherein the 6th lens L6 and the 7th is saturating Mirror L7 is glued.

4. a kind of large aperture silent frame industrial lens according to right 1, it is characterised in that: nine optics in optical lens Focal length, refractive index and the Abbe number of lens meet the following conditions:

-150<f1<-105 1.52<n1<1.57 55.3<v1<62.4 -90<f2<-70 1.47<n2<1.52 68.5<v2<73.5 35<f3<45 1.78<n3<1.85 40.2<v3<45.3 126<f4<135 1.67<n4<1.72 28.3<v4<31.2 -35<f5<-25 1.61<n5<1.66 30.7<v5<35.2 -385<f6<-336 1.83<n6<1.87 40.2<v6<45.3 62<f7<70 1.63<n7<1.68 53.2<v7<57.6 70<f8<78 1.78<n8<1.85 40.2<v8<45.3 75<f9<85 1.78<n9<1.85 40.2<v9<45.3

Here ni indicates the refractive index of i-th of lens, and vi indicates that the Abbe number of i-th of lens, fi indicate i-th of lens Focal length, unit mm, i=1,2,3 ... 9.