CN203311082U

CN203311082U - 4mm day and night prime lens

Info

Publication number: CN203311082U
Application number: CN201320382054XU
Authority: CN
Inventors: 张品光; 何剑炜; 邹玉
Original assignee: Dongguan Yutong Optical Technology Co Ltd
Current assignee: Dongguan Yutong Optical Technology Co Ltd
Priority date: 2013-06-28
Filing date: 2013-06-28
Publication date: 2013-11-27
Anticipated expiration: 2023-06-28

Abstract

The utility model discloses a 4mm day and night prime lens. The lens comprises a first lens of convex-concave negative focal power, a second lens of double concave negative focal power, a third lens of double convex positive focal power, a fourth lens of the double concave negative focal power, a fifth lens of the double convex positive focal power, a sixth lens of double convex positive focal power and a seventh lens of convex-plane positive focal power, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, sixth lens and the seventh lens are successively arranged along an incident direction of light. The fourth lens and the fifth lens are bonded through an optical glue. The lens adopts a six-group seven-piece structure whose focal power is negative, negative, positive, negative, positive, positive and positive. Through reasonably distributing the focal power, the focal power of each lens is in a reasonable interval so that a tolerance sensitivity is reduced maximumly. Processing of the lens and related structural components is easy and manufacturing cost is reduced. A gluing lens is reasonably arranged so that chromatic aberration and spherical aberration are corrected and imaging quality is greatly improved. A F1.2 large relative aperture and a maximum 1/2.3'' imaging surface are possessed so that a clear and bright frame under low illumination at night can be realized.

Description

4mm day and night tight shot

Technical field

The utility model relates to field of optical lens, refers to especially a kind of 4mm day and night tight shot.

Background technology

Tight shot is multiplex has fast response time in the monitoring of fixed scene, the advantages such as good imaging quality.The 4mm tight shot has larger field angle, is widely used in the place that needs large-range monitoring; Often the tolerance susceptibility is also higher for the high camera lens of image quality, and this makes, and high-quality tight shot manufacture difficulty is large, cost is high; Traditional 4mm camera lens is subject to the machining eyeglass ability, and often to exist clear aperature smaller, be generally the F1.8 left and right, little maximum the support to 1/3 of imaging surface " image planes; sharpness is not high to be generally below mega pixel, has that image quality is not high, purple boundary is serious, a whole defect such as penetrating not of picture.Therefore designing the 4mm tight shot that a kind of image quality is high just seems particularly important.

The utility model content

The purpose of this utility model is to provide the 4mm day and night tight shot that a kind of image quality is high.

For achieving the above object, the technical solution adopted in the utility model is as follows:

A kind of 4mm day and night tight shot, comprise the first lens of the convex-concave negative power set gradually along the light incident direction, the second lens of concave-concave negative power, the 3rd lens of biconvex positive light coke, the 4th lens of concave-concave negative power, the 5th lens of biconvex positive light coke, the 6th lens of biconvex positive light coke, the 7th lens of convex flat positive light coke, the 4th lens and the 5th lens are bonding by optical cement; The focal length of seven lens of this camera lens, refractive index reach the radius-of-curvature of totally ten four curved surfaces and meet the following conditions respectively:

-18.565≤f1≤-19.318	1.58≤n1≤1.63	9.756≤R1≤10.223	5.024≤R2≤5.975
				-6.314≤f2≤-7.25	1.63≤n2≤1.69	-11.23≤R3≤-12.24	7.11≤R4≤7.89
9.52≤f3≤10.31	1.78≤n3≤1.85	13.37≤R5≤14.26	-16.87≤R6≤-17.65
				-6.71≤f4≤-7.25	1.78≤n4≤1.85	-25.75≤R7≤-26.83	7.33≤R8≤7.95
7.14≤f5≤8.112	1.63≤n5≤1.69	7.33≤R9≤7.95	-12.105≤R10≤-12.998
				16.34≤f6≤17.26	1.58≤n6≤1.63	13.221≤R11≤14,15	-37.28≤R12≤-37.45
18.05≤f7≤19.11	1.58≤n7≤1.63	10.98≤R13≤11.75	200≤R14≤∞

In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius-of-curvature, and "-" number means that direction is for negative.

Further, described first lens and the second lens directly near, and the axial spacing at optical axis place is 3.556mm; The second lens and the 3rd lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 2.305mm; The 3rd lens and the 4th lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 6.622mm; The 5th lens and the 6th lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 0.1mm; The 6th lens and the 7th lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 2.85mm.

A kind of 4mm day and night of the utility model tight shot adopts negative, negative, and just, negative, just, just, positive 6 group of 7 slice structure, by the reasonable distribution focal power, make the focal power of each eyeglass all at reasonable interval, at utmost reduced the tolerance susceptibility; Make the processing ratio of eyeglass and dependency structure spare be easier to, reduced manufacturing cost; The gummed eyeglass reasonably is set and makes aberration and spherical aberration be revised, image quality promotes greatly; Have the F1.2 object lens of large relative aperture, maximum 1/2.3 " imaging surface, even under low-light (level), also can realize clear bright picture at night.

The accompanying drawing explanation

Fig. 1 is the assembly drawing of each lens of 4mm day and night tight shot of the present utility model.

Fig. 2 is the optical system diagram of the 4mm day and night tight shot of Fig. 1.

Embodiment

For the technical solution of the utility model can more clearly be showed, the utility model is described in further detail below in conjunction with accompanying drawing.

With reference to a kind of 4mm day and night tight shot illustrated in figures 1 and 2, the first lens L1, the second lens L2, the 3rd lens L3 of biconvex positive light coke of concave-concave negative power, the 4th lens L4, the 5th lens L5 of biconvex positive light coke of concave-concave negative power, the 6th lens L6 of biconvex positive light coke, the 7th lens L7 of convex flat positive light coke that comprise the convex-concave negative power set gradually along the light incident direction, first lens L1 and the second lens L2 directly near, and the axial spacing at optical axis place is 3.556mm; The second lens L2 and the 3rd lens L3 are by the spacer ring close-fitting, and the axial spacing at optical axis place is 2.305mm; The 3rd lens L3 and the 4th lens L4 are by the spacer ring close-fitting, and the axial spacing at optical axis place is 6.622mm; The 4th lens L4 and the 5th lens L5 are bonding by optical cement; The 5th lens L5 and the 6th lens L6 are by the spacer ring close-fitting, and the axial spacing at optical axis place is 0.1mm; The 6th lens L6 and the 7th lens L7 are by the spacer ring close-fitting, and the axial spacing at optical axis place is 2.85mm.

The focal length of seven lens of this camera lens, refractive index reach the radius-of-curvature of totally ten four curved surfaces and meet the following conditions respectively:

This 4mm day and night tight shot adopts negative, negative, and just, negative, just, just, positive 6 group of 7 slice structure, by the reasonable distribution focal power, make the focal power of each eyeglass all at reasonable interval, at utmost reduced the tolerance susceptibility; Make the processing ratio of eyeglass and dependency structure spare be easier to, reduced manufacturing cost; The gummed eyeglass reasonably is set and makes aberration and spherical aberration be revised, image quality promotes greatly; Have the F1.2 object lens of large relative aperture, maximum 1/2.3 " imaging surface, even under low-light (level), also can realize clear bright picture at night.

Above embodiment just is explanation rather than restriction the utility model, therefore all equivalences of doing according to the described method of the utility model patent claim change or modify, is included in the utility model patent claim.

Claims

1. 4mm day and night tight shot, it is characterized in that: comprise the first lens of the convex-concave negative power set gradually along the light incident direction, the second lens of concave-concave negative power, the 3rd lens of biconvex positive light coke, the 4th lens of concave-concave negative power, the 5th lens of biconvex positive light coke, the 6th lens of biconvex positive light coke, the 7th lens of convex flat positive light coke, the 4th lens and the 5th lens are bonding by optical cement; The focal length of seven lens of this camera lens, refractive index reach the radius-of-curvature of totally ten four curved surfaces and meet the following conditions respectively:

2. a kind of 4mm day and night tight shot according to claim 1 is characterized in that: described first lens and the second lens directly near, and the axial spacing at optical axis place is 3.556mm; The second lens and the 3rd lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 2.305mm; The 3rd lens and the 4th lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 6.622mm; The 5th lens and the 6th lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 0.1mm; The 6th lens and the 7th lens are by the spacer ring close-fitting, and the axial spacing at optical axis place is 2.85mm.