CN103323935B

CN103323935B - Large-zoom camera lens capable of being used in the day and at night

Info

Publication number: CN103323935B
Application number: CN201310261737.4A
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: 2013-06-26
Filing date: 2013-06-26
Publication date: 2015-01-28
Anticipated expiration: 2033-06-26
Also published as: CN103323935A

Abstract

The invention discloses a large-zoom camera lens capable of being used both in the day and at night. The large-zoom camera lens comprises a front fixed set, a zoom set, a rear fixed set and a compensation set, wherein the overall focal power of the front fixed set is positive, the overall focal power of the zoom set is negative, the overall focal power of the rear fixed set is positive, and the overall focal power of the compensation set is positive. The front fixed set comprises a first lens with convex-concave negative focal power, a second lens with convex-concave positive focal power and a third lens with convex-concave negative focal power. The zoom set comprises a fourth lens with concavo-concave negative focal power, a fifth lens with concavo-concave negative focal power and a sixth lens with convex-concave positive focal power. The rear fixed set comprises a seventh lens with convexo-convex positive focal power, an eighth lens with concave-convex negative focal power, a ninth lens with convex-concave positive focal power and a tenth lens with concavo-concave negative focal power. The compensation set comprises an eleventh lens with convexo-convex positive focal power, a twelfth lens with concave-convex negative focal power and a thirteenth lens with convexo-convex positive focal power. According to the large-zoom camera lens capable of being used in the day and at night, at least one lens is an ultralow dispersing lens, and at least two lenses are directly glued. The large-zoom camera lens is compact in structure, clear in image formation and capable of being used both in the day and at night.

Description

A kind of large zoom day and night lens

Technical field

The present invention relates to field of optical lens, refer to a kind of large zoom day and night lens especially.

Background technology

Along with the fast development of security protection industry, increasing occasion needs the camera lens using large zoom to meet closely and monitoring at a distance.Traditional large zoom lens is by multiple lens combination, and more number of lenses and longer optical length realize.Volume as a rule in order to reduce zoom lens needs the focal power reducing zoom group to shorten stroke, and little focal power is brought is the aberration being more difficult to more greatly correct, and this makes, and image quality is unstable, picture element declines.This is a large difficult point of design how to realize reaching higher image quality on less volume.Existing large zoom lens is all 5 constituent element designs usually, and such as US Patent No. 6061186 is just illustrating one, negative, and just, just, the whole case for lense of 5 component zooming camera lens of negative power is containing 17-19 optical lens; In order to reduce camera lens volume and promote image quality, introducing non-spherical lens is more effective solution, the such as patent No. is that the Chinese patent of CN200510078499.9 is just illustrating one, negative, just, just, the zoom lens of positive 5 constituent elements comprises 12 optical lenses, wherein at least comprises 2 non-spherical lenses.Due to the optical mirror slip that known large zoom lens is all 5 Component Structure more than 16 pieces, this camera lens volume is large, weight is large, or reduce number of lenses by introducing more non-spherical lens, reduce camera lens volume, but aspheric introducing makes the manufacture difficulty of eyeglass and cost sharply increase.These volumes that all fundamentally can not solve large zoom lens existence are at present large, processing and manufacturing difficulty, high in cost of production problem.In addition, the monitoring at night is also more and more important, common monitoring camera mainly for daytime visible light conditions design, can only monitor under visible light conditions, but the monitoring occasion had, human eye sightless infrared light can only be equipped with evening, because infrared light is different from the wavelength of visible ray, and infrared light do not considered in design by common camera lens, the image planes position of their imagings can offset, there is infrared out of focus, the phenomenon showed be exactly under infrared light condition image blur, image quality poor.

Summary of the invention

The object of this invention is to provide the large zoom day and night lens of a kind of compact conformation, imaging clearly.

For achieving the above object, the technical solution used in the present invention is as follows:

A kind of large zoom day and night lens, comprise that total focal power is positive front fixing group, total focal power is negative zoom group, total focal power be positive rear fixing group and total focal power is positive compensating group, carry out zoom by the relative position changing zoom group and compensating group, before described, fixing group comprises the first lens, the second lens of convex-concave positive light coke, the 3rd lens of convex-concave negative power of the tactic convex-concave negative power from object space side; Described zoom group comprises the 4th lens, the 5th lens of concave-concave negative power, the 6th lens of convex-concave positive light coke of the tactic concave-concave negative power from object space side; Described rear fixing group of the 8th lens, the 9th lens of convex-concave positive light coke, the tenth lens of concave-concave negative power comprised from the 7th lens of object space side tactic biconvex positive light coke, concavo-convex negative power; Described compensating group comprises the 11 lens, the 12 lens of concavo-convex negative power, the 13 lens of biconvex positive light coke of the tactic biconvex positive light coke from object space side; In 13 lens of this camera lens, have at least a slice lens to be Extra-low Dispersion lens, and have at least two panels lens to be directly glue together; The radius-of-curvature of the focal length of 13 lens of this camera lens, refractive index and totally two ten six curved surfaces meets the following conditions respectively:

-86.13≤f1≤-87.51	1.71≤n1≤1.78	56.543≤R1≤58.914	27.12≤R2≤28.31
				66.42≤f2≤68.35	1.47≤n2≤1.52	27.12≤R3≤28.31	1750≤R4≤2370
-42.23≤f3≤-43.62	1.65≤n3≤1.71	27.865≤R5≤29.32	122≤R6≤132
				-10.15≤f4≤-11.27	1.71≤n4≤1.78	-100.23≤R7≤-119.4	7.96≤R8≤8.33
-16.85≤f5≤-18.93	1.45≤n5≤1.55	-19.58≤R9≤-21.96	9.73≤R10≤10.36
				18.16≤f6≤19.98	1.8≤n6≤1.85	9.73≤R11≤10.36	42.16≤R12≤47.31
9.159≤f7≤10.35	1.45≤n7≤1.51	10.1≤R13≤11.96	-6.19≤R14≤-10.85
				-19.147≤f8≤-21.67	1.45≤n8≤1.53	-6.19≤R15≤-10.85	-34.96≤R16≤-38.49
16.17≤f9≤17.69	1.71≤n9≤1.78	11.29≤R17≤12.11	-39.95≤R18≤-288.66
				-8.53≤f10≤-9.81	1.61≤n10≤1.69	-15.22≤R19≤-17.56	7.55≤R20≤8.13
9.192≤f11≤10.87	1.65≤n11≤1.73	26.58≤R21≤31.869	-7.71≤R22≤-8.19
				-11.237≤f12≤-12.435	1.79≤n12≤1.86	-7.71≤R23≤-8.19	-91≤R24≤-113.35
14.218≤f13≤15.369	1.65≤n13≤1.76	14.35≤R25≤19.33	-22.56≤R26≤-30.31

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.

A kind of preferred version, the first lens and the second lens of fixing group before described directly glue together.

A kind of preferred version, the 5th lens and the 6th lens of described zoom group directly glue together.

A kind of preferred version, the 7th lens and the 8th lens of described latter fixing group directly glue together.

A kind of preferred version, the 11 lens of described compensating group and the 12 lens directly glue together.

Further, the focal length zoom ratio scope of described camera lens is 5-20 times.

A kind of large zoom day and night lens of the present invention by optical texture innovation adopt total focal power be followed successively by positive and negative, just, positive four Component Structures, by the focal power of each eyeglass of reasonable distribution, the lens comparatively responsive to tolerance are made to concentrate on latter fixing group, the manufacture build-up tolerance that so only need control latter fixing group just can reach the stable of overall picture element, and higher yields, greatly reduce cost; Under the prerequisite not adopting aspherical lens, can realize the densification miniaturization of large zoom lens volume, and make image quality comparatively good, can meet the demand of high-definition monitoring, cost is lower, and market outlook are extensive.Realize full focal length section by using Extra-low Dispersion lens reasonable distribution focal power to overlap with near-infrared band focal length at visible light wave range and namely eliminate infrared out of focus, realize-20 DEG C-80 DEG C not out of focus by reasonably selecting other lenses and Extra-low Dispersion lens combination, possess day and night with burnt function, namely also can become sharply defined image to infrared light when visible ray becomes sharply defined image without the need to focusing.

Accompanying drawing explanation

Fig. 1 is the assembly drawing of each lens of large zoom day and night lens of the present invention.

Fig. 2 is the optical system diagram of the large zoom day and night lens of Fig. 1.

The spherical aberration performance diagram of camera lens when field angle is 66 ° that Fig. 3 provides for the first embodiment.

The color aberration characteristics curve map of camera lens when field angle is 66 ° that Fig. 4 provides for the first embodiment.

The curvature of field performance diagram of camera lens when field angle is 66 ° that Fig. 5 provides for the first embodiment.

The spherical aberration performance diagram of camera lens when field angle is 8 ° that Fig. 6 provides for the first embodiment.

The color aberration characteristics curve map of camera lens when field angle is 8 ° that Fig. 7 provides for the first embodiment.

The curvature of field performance diagram of camera lens when field angle is 8 ° that Fig. 8 provides for the first embodiment.

The spherical aberration performance diagram of camera lens when field angle is 64.6 ° that Fig. 9 provides for the second embodiment.

The color aberration characteristics curve map of camera lens when field angle is 64.6 ° that Figure 10 provides for the second embodiment.

The curvature of field performance diagram of camera lens when field angle is 64.6 ° that Figure 11 provides for the second embodiment.

The spherical aberration performance diagram of camera lens when field angle is 8 ° that Figure 12 provides for the second embodiment.

The color aberration characteristics curve map of camera lens when field angle is 8 ° that Figure 13 provides for the second embodiment.

The curvature of field performance diagram of camera lens when field angle is 8 ° that Figure 14 provides for the second embodiment.

Embodiment

In order to make technical scheme of the present invention more clearly show, below in conjunction with accompanying drawing, the invention will be further described.

With reference to the large zoom day and night lens of the one shown in figure 1 and Fig. 2, comprise front fixing group, zoom group, rear fixing group and compensating group, regulated the focal length zoom ratio of whole camera lens by the relative position changing zoom group and compensating group, focal length zoom ratio scope is 5-20 times.

Before described, fixing group comprises the first lens L1, the second lens L2 of convex-concave positive light coke, the 3rd lens L3 of convex-concave negative power of the tactic convex-concave negative power from object space side, first lens L1 and the second lens L2 directly glues together, the 3rd lens L3 and the second lens L2 by spacer ring near assembling.

Described zoom group comprises the 4th lens L4, the 5th lens L5 of concave-concave negative power, the 6th lens L6 of convex-concave positive light coke of the tactic concave-concave negative power from object space side, 5th lens L5 and the 6th lens L6 directly glues together, and the 4th lens L4 and the 5th lens L5 is directly near assembling.

Described rear fixing group of the 8th lens L8, the 9th lens L9 of convex-concave positive light coke, the tenth lens L10 of concave-concave negative power comprised from the 7th lens L7 of object space side tactic biconvex positive light coke, concavo-convex negative power, 7th lens L7 and the 8th lens L8 directly glues together, 9th lens L9 and the 8th lens L8 by spacer ring near assembling, and between the 9th lens L9 and described tenth lens L10 also by spacer ring near assembling.

Described compensating group comprises the 11 lens L11, the 12 lens L12 of concavo-convex negative power, the 13 lens L13 of biconvex positive light coke of the tactic biconvex positive light coke from object space side, 11 lens L11 and the 12 lens L12 directly glues together, the 13 lens L13 and the 12 lens L12 by spacer ring near assembling.

Embodiment one:

When the radius-of-curvature in totally two ten six faces, lens thickness, lens pitch and lens index meet the following conditions 13 lens of this camera lens respectively:

Face sequence number	R	D	n
				1	56.543	0.841	1.75
2	27.742	4.93	1.47
				3	2361.021	0.1	?
4	28.565	4.129	1.7
				5	130.941	1.27 ~ 25.29 is variable	?
6	-117.216	0.846	1.76
				7	8.113	3.513	?
8	-21.355	0.843	1.49
				9	9.919	3.248	1.81
10	42.381	26.8 ~ 2.785 is variable	?
				Diaphragm	PL	0.55	?
12	10.103	4.672	1.5
				13	-7	0.766	1.49
14	-35.351	0.1	?
				15	11.512	2.959	1.75
16	-255.696	0.721	?
				17	-15.375	0.845	1.61
18	7.852	5.796 ~ 4.147 is variable	?
				19	29.162	3.095	1.69
20	-7.781	0.752	1.85
				21	-91	0.112	?
22	18.354	2.58	1.65
				23	-22.854	?	?

In upper table, " n " is refractive index, and " R " is radius-of-curvature, and "-" number represents that direction is negative, and " PL " represents plane; The cemented surface of two panels lens gummed is designated as a face, the existing refractive index data n's and data D of upper table the same face sequence number, data D represents the thickness at this lens axial line place, and the same face sequence number only has data D and do not have refractive index data n, and data D represents the spacing of this lens face to next lens face.

Fig. 3 to Fig. 5 is spherical aberration, aberration and the curvature of field family curve that this large zoom day and night lens records respectively when field angle is 66 °, as can be seen from the figure, spherical aberration controls within positive and negative 0.1mm, and Difference Control is within positive and negative 2 μm, and the curvature of field controls within positive and negative 0.1mm; And spherical aberration, aberration and curvature of field family curve that Fig. 6 to Fig. 8 large zoom day and night lens that is this records respectively when field angle is 8 °, as can be seen from the figure, spherical aberration controls within positive and negative 0.1mm, and Difference Control is within positive and negative 5 μm, and the curvature of field controls within positive and negative 0.2mm; As can be seen here, the spherical aberration of the large zoom day and night lens that provides of first embodiment of the invention, aberration and the curvature of field can be controlled in less scope.

Embodiment two:

When the refractive index of 13 lens of this camera lens and the radius-of-curvature of totally two ten six curved surfaces meet the following conditions respectively:

Face sequence number	R	D	n
				1	58.914	1.217	1.71
2	27.551	5.166	1.52
				3	1763.646	0.1	?
4	28.675	3.94	1.69
				5	123.398	1.27 ~ 25.29 is variable	?
6	-101.099	0.846	1.76
				7	8.183	3.466	?
8	-19.677	0.886	1.49
				9	10.065	3.091	1.84
10	45.305	26.8 ~ 2.785 is variable	?
				Diaphragm	PL	0.3	?
12	11.461	4.588	1.49
				13	-10.841	0.811	1.51
14	-38.46	0.114	?
				15	11.421	2.675	1.74
16	-40.01	0.569	?
				17	-15.85	0.716	1.63
18	7.859	5.796 ~ 4.147 is variable	?
				19	31.52	3.136	1.69
20	-7.841	0.799	1.86
				21	-100.539	0.127	?
22	19.059	2.835	1.68
				23	-23.31	?	?

Fig. 9 to Figure 11 is spherical aberration, aberration and the curvature of field family curve that this large zoom day and night lens records respectively when field angle is 64.6 °, as can be seen from the figure, spherical aberration controls within positive and negative 0.2mm, Difference Control is within positive and negative 1 μm, and the curvature of field controls within positive and negative 0.1mm; And spherical aberration, aberration and curvature of field family curve that Figure 12 to Figure 14 large zoom day and night lens that is this records respectively when field angle is 8 °, as can be seen from the figure, spherical aberration controls within positive and negative 0.2mm, Difference Control is within positive and negative 2 μm, and the curvature of field controls within positive and negative 0.2mm; As can be seen here, the spherical aberration of the large zoom day and night lens that provides of second embodiment of the invention, aberration and the curvature of field can be controlled in less scope.

Above embodiment is merely illustrative and not limiting to the invention, therefore all equivalences done according to the method described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.

Claims

1. a large zoom day and night lens, it is characterized in that: comprise that total focal power is positive front fixing group, total focal power is negative zoom group, total focal power be positive rear fixing group and total focal power is positive compensating group, carry out zoom by the relative position changing zoom group and compensating group, before described, fixing group comprises the first lens, the second lens of convex-concave positive light coke, the 3rd lens of convex-concave negative power of the tactic convex-concave negative power from object space side; Described zoom group comprises the 4th lens, the 5th lens of concave-concave negative power, the 6th lens of convex-concave positive light coke of the tactic concave-concave negative power from object space side; Described rear fixing group of the 8th lens, the 9th lens of convex-concave positive light coke, the tenth lens of concave-concave negative power comprised from the 7th lens of object space side tactic biconvex positive light coke, concavo-convex negative power; Described compensating group comprises the 11 lens, the 12 lens of concavo-convex negative power, the 13 lens of biconvex positive light coke of the tactic biconvex positive light coke from object space side; In 13 lens of this camera lens, have at least a slice lens to be Extra-low Dispersion lens, and have at least two panels lens to be directly glue together; The radius-of-curvature of the focal length of 13 lens of this camera lens, refractive index and totally two ten six curved surfaces meets the following conditions respectively:

2. the large zoom day and night lens of one according to claim 1, is characterized in that: the first lens and the second lens of fixing group before described directly glue together.

3. the large zoom day and night lens of one according to claim 1, is characterized in that: the 5th lens and the 6th lens of described zoom group directly glue together.

4. the large zoom day and night lens of one according to claim 1, is characterized in that: the 7th lens and the 8th lens of described latter fixing group directly glue together.

5. the large zoom day and night lens of one according to claim 1, is characterized in that: the 11 lens of described compensating group and the 12 lens directly glue together.

6. the large zoom day and night lens of one according to claim 1, is characterized in that: the focal length zoom ratio scope of described camera lens is 5-20 times.