CN104076491B - 6mm day and night tight shot - Google Patents

Abstract

The invention discloses a kind of 6mm day and night tight shot, comprise the first lens of the convex-concave negative power set gradually along light direction, the second lens of concavo-convex positive light coke, 3rd lens of biconvex positive light coke, 4th lens of concave-concave negative power, the 5th lens of biconvex positive light coke; This camera lens adopts focal power to be followed successively by negative, positive, positive and negative, positive lens combination, fit lens shape, by reasonable distribution focal power, realize the relative aperture of F1.8, visible ray three mega pixel, image quality is good, and makes infrared not out of focus, even if also can realize monitored picture clearly at night under low-light (level); This camera lens is 4 groups of totally 5 lens, and eyeglass is few, cost is low, compact conformation.

Description

6mm day and night tight shot

Technical field

The present invention relates to field of optical lens, refer in particular to a kind of 6mm day and night tight shot.

Background technology

Along with raising and the development of science and technology of people's security consciousness, internet alarm system, long distance control system, intelligent domestic system and intelligent transportation system gradually popularization and application in market, bank, garage, the occasion such as star hotel and traffic main artery.Monitoring camera, as a kind of semiconductor imaging device, takes on important role in above-mentioned security system.

6mm day and night tight shot belongs to main product type in whole monitoring camera industry.The number of lenses that the camera lens that as a rule the better resolution of image quality is higher uses is more, and more eyeglass is conducive to correcting aberration and improves resolution, but the cost of camera lens also rises thereupon.In addition, if need the occasion of day and night monitoring continuously, then need the camera lens using day and night, but, common fixed focus monitoring camera lens mainly for daytime visible light conditions design, and evening is when being only equipped with the sightless infrared light of human eye, imaging is then comparatively fuzzy, cannot meet night monitoring requirement.Therefore be necessary to design the low camera lens of a kind of cost, require that this camera lens can realize day and night monitoring continuously simultaneously.

Summary of the invention

The 6mm day and night tight shot that the object of the present invention is to provide a kind of cost low.

To achieve these goals, the technical solution used in the present invention is as follows:

A kind of 6mm day and night tight shot, comprise the first lens of the convex-concave negative power set gradually along light direction, the second lens of concavo-convex positive light coke, 3rd lens of biconvex positive light coke, the 4th lens of concave-concave negative power, the 5th lens of biconvex positive light coke; Five lens of this camera lens the radius-of-curvature of focal length, refractive index and totally ten curved surfaces meet the following conditions respectively:

f1＝-9.75—-10.68	n1＝1.55-1.61	R1＝20.11—21.56	R2＝4.26—5.19
				f2＝14.25—15.19	n2＝1.51—1.58	R3＝7.95—8.79	R4＝74.87—76.23
f3＝8.44—9.35	n3＝1.51-1.58	R5＝-9.51—-10.36	R6＝-5.32—-6.19
				f4＝-3.21—-4.13	n4＝1.55-1.63	R7＝10.57-11.24	R8＝-4.11—-5.21
f5＝3.95—4.66	n5＝1.65-1.73	R9＝-4.11—-5.21	R10＝-17.85—-18.56

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

Further, the first described lens and the second lens directly near, and the axial distance at optical axis place is 2.39mm; Second lens and the 3rd lens are by spacer ring close-fitting, and the axial distance at optical axis place is 2.02mm; 3rd lens and the 4th lens are by spacer ring close-fitting, and the axial distance at optical axis place is 1.41mm; 4th lens and the 5th lens directly near, and the axial distance at optical axis place is 0.12mm.

Further, according to aspherical equation formula:

$Z\left(Y\right)=\frac{Y^{2}R}{1+\sqrt{1-(1+K)Y^2/R^2}}+A*Y^4+B*Y^6+C*Y^8+D*Y^{10}+E*Y^{12}$

Described second lens meet following relation:

R

K

A

B

C

D

E

R3

-15.1519

-4.6615E-003

3.41256E-004

-4.87561E-006

-7.23456E-007

4.75661E-008

R4

-2.2154

2.12074E-003

-1.456212E-004

6.8561E-006

-6.2456E-007

3.2154E-008

Described 3rd lens meet following relation:

R

K

A

B

C

D

E

R5

-58.4655

4.98756E-003

-6.12453E-004

1.5648E-004

-1.3479E-005

6.2457E-007

R6

-6.51323

3.12451E-004

-2.34561E-005

2.87941E-005

-1.2145E-005

8.54756E-007

6mm day and night tight shot of the present invention adopts focal power to be followed successively by negative, positive, positive and negative, positive lens combination, fit lens shape, by reasonable distribution focal power, realize the relative aperture of F1.8, visible ray three mega pixel, image quality is good, and makes infrared not out of focus, even if also can realize monitored picture clearly at night under low-light (level); This camera lens is 4 groups of totally 5 lens, and eyeglass is few, cost is low, compact conformation.

Accompanying drawing explanation

Fig. 1 is the optical system diagram of 6mm day and night tight shot;

Fig. 2 is the cut-open view of 6mm day and night tight shot.

Embodiment

Please refer to shown in Fig. 1 and Fig. 2,6mm day and night tight shot of the present invention, comprise the second lens L2 of the first lens L1 of the convex-concave negative power set gradually along light direction, concavo-convex positive light coke, 3rd lens L3 of biconvex positive light coke, 4th lens L4 of concave-concave negative power, the 5th lens L5 of biconvex positive light coke; Wherein, the first described lens L1 and the second lens L2 directly near, and the axial distance at optical axis place is 2.39mm; Second lens L2 and the 3rd lens L3 is by spacer ring close-fitting, and the axial distance at optical axis place is 2.02mm; 3rd lens L3 and the 4th lens L4 is by spacer ring close-fitting, and the axial distance at optical axis place is 1.41mm; 4th lens L4 and the 5th lens L5 directly near, and the axial distance at optical axis place is 0.12mm.Five lens of this camera lens the radius-of-curvature of focal length, refractive index and totally ten curved surfaces meet the following conditions respectively:

f1＝-9.75—-10.68	n1＝1.55-1.61	R1＝20.11—21.56	R2＝4.26—5.19
				f2＝14.25—15.19	n2＝1.51—1.58	R3＝7.95—8.79	R4＝74.87—76.23
f3＝8.44—9.35	n3＝1.51-1.58	R5＝-9.51—-10.36	R6＝-5.32—-6.19
				f4＝-3.21—-4.13	n4＝1.55-1.63	R7＝10.57-11.24	R8＝-4.11—-5.21
f5＝3.95—4.66	n5＝1.65-1.73	R9＝-4.11—-5.21	R10＝-17.85—-18.56

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

According to aspherical equation formula:

$Z\left(Y\right)=\frac{Y^{2}R}{1+\sqrt{1-(1+K)Y^2/R^2}}+A*Y^4+B*Y^6+C*Y^8+D*Y^{10}+E*Y^{12}$

In a kind of preferred embodiments, described second lens meet following relation:

R

K

A

B

C

D

E

R3

-15.1519

-4.6615E-003

3.41256E-004

-4.87561E-006

-7.23456E-007

4.75661E-008

R4

-2.2154

2.12074E-003

-1.456212E-004

6.8561E-006

-6.2456E-007

3.2154E-008

Described 3rd lens meet following relation:

R

K

A

B

C

D

E

R5

-58.4655

4.98756E-003

-6.12453E-004

1.5648E-004

-1.3479E-005

6.2457E-007

R6

-6.51323

3.12451E-004

-2.34561E-005

2.87941E-005

-1.2145E-005

8.54756E-007

This camera lens adopts focal power to be followed successively by negative, positive, positive and negative, positive lens combination, fit lens shape, by reasonable distribution focal power, realize the relative aperture of F1.8, visible ray three mega pixel, image quality is good, and makes infrared not out of focus, even if also can realize monitored picture clearly at night under low-light (level); This camera lens is 4 groups of totally 5 lens, and eyeglass is few, cost is low, compact conformation.

Foregoing, is only preferred embodiment of the present invention, and not for limiting embodiment of the present invention, those skilled in the art are according to design of the present invention, and done appropriate adaptation or amendment, all should within protection scope of the present invention.

Claims (3)

1.6mm day and night tight shot, it is characterized in that: comprise the first lens of the convex-concave negative power set gradually along light direction, the second lens of concavo-convex positive light coke, 3rd lens of biconvex positive light coke, the 4th lens of concave-concave negative power, the 5th lens of biconvex positive light coke; Five lens of this camera lens the radius-of-curvature of focal length, refractive index and totally ten curved surfaces meet the following conditions respectively:

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

2. 6mm day and night tight shot according to claim 1, is characterized in that: the first described lens and the second lens directly near, and the axial distance at optical axis place is 2.39mm; Second lens and the 3rd lens are by spacer ring close-fitting, and the axial distance at optical axis place is 2.02mm; 3rd lens and the 4th lens are by spacer ring close-fitting, and the axial distance at optical axis place is 1.41mm; 4th lens and the 5th lens directly near, and the axial distance at optical axis place is 0.12mm.

3. 6mm day and night tight shot according to claim 1 or claim 2, is characterized in that: according to aspherical equation formula:

Described second lens meet following relation:

Described 3rd lens meet following relation:

。