CN208367321U

CN208367321U - The characteristic far infrared optical system for having zoom function

Info

Publication number: CN208367321U
Application number: CN201820896128.4U
Authority: CN
Inventors: 厉冰川; 盛亚茗; 尚洁阳
Original assignee: Jiaxing Zhongrun Optical Technology Co Ltd
Current assignee: Jiaxing Zhongrun Optical Technology Co Ltd
Priority date: 2018-06-11
Filing date: 2018-06-11
Publication date: 2019-01-11
Anticipated expiration: 2028-06-11

Abstract

A kind of characteristic far infrared optical system having zoom function successively includes: the first fixed lens group with positive light coke, the zoom lens group with negative power, aperture diaphragm, the with positive light coke second fixed lens group, the condenser lens group with positive light coke and sensor from the object side to image side；Zoom lens group moves the zoom realized from wide-angle side to telescope end along optical axis from object side to image side, and condenser lens group moves the correction for realizing burnt problem empty to zoom process and object distance change procedure bring along optical axis；The utility model introducing rotation inflection is aspherical to solve the problems, such as that periphery light than deficiency, realizes and far infrared is imaged；Only need four pieces of eyeglasses that the Zoom structure of camera lens, while 2.5 times of zoom or more can be realized；Focal length of the camera lens from wide-angle side to telescope end is held essentially constant, and will not be changed with the variation of multiplying power.

Description

The characteristic far infrared optical system for having zoom function

Technical field

It is specifically a kind of to have the remote red of zoom function the utility model relates to a kind of technology in optical device field Outer optical system.

Background technique

Organic life entity such as human body can be naturally to the light of external radiation far infrared band, so far infrared imagery camera lens exists In the environment of complete darkness, do not need to rely on any additional light source that personage's imaging can be realized.Therefore in safety defense monitoring system As the supplement to visible light and near infrared light imaging system, far infrared camera lens is of great significance.Firstly, in the prior art Two groups of Zoom structures are in zooming procedure, and acutely, the focal length of telescope end is very big, and shooting effect is or not the aperture bore variation of camera lens It is good；The bore that the wide-angle of wide-angle side will lead to camera lens pre-group is huge, and model must entirely be moved in pre-group by being limited to zoom mode The space of identical caliber size is reserved in enclosing, therefore the front port diameter of such camera lens is often all very huge.Secondly, existing skill Four groups of Zoom structures in art are because two or three groups of shift motion mutuals are overlapped, and when reserved margin both must be taken into account, so mirror Head multiplying power is difficult to do big；Two or three groups it is intermediate be all group mobility range, fixed group is set without space, thus can not be Stabilization function is expanded on the basis of this.Finally, far infrared camera lens in the prior art is very higher than requiring to periphery light, but visible light Framework is difficult to apply on far infrared camera lens.

Utility model content

The utility model In view of the above shortcomings of the prior art, proposes a kind of characteristic far infrared optical for having zoom function System, introducing rotation inflection is aspherical to solve the problems, such as that periphery light than deficiency, realizes and far infrared is imaged, while mirror Head has zoom function and high definition imaging performance.

The utility model is achieved through the following technical solutions:

The utility model successively includes: the first fixed lens group with positive light coke, has negative light from the object side to image side The zoom lens group of focal power, aperture diaphragm, the with positive light coke second fixed lens group, the condenser lens with positive light coke Group and sensor, zoom lens group move the zoom realized from wide-angle side to telescope end along optical axis from object side to image side, gather Focus lens group moves the correction for realizing burnt problem empty to zoom process and object distance change procedure bring along optical axis.

At least one piece is equipped in the zoom lens group with negative power and using the lens of rotational symmetric aspheric To improve the coma of camera lens telescope end.

At least one piece is equipped in the fixed lens group of described second with positive light coke and using rotational symmetric aspheric Color difference on axis of the lens to improve camera lens wide-angle side.

At least one piece lens with negative power are equipped in the condenser lens group to improve the intelligent of camera lens wide-angle side Difference.

Optical filtering and protection glass are successively arranged between the condenser lens group and sensor.

The optical filtering is preferably that germanium is made to filter out unnecessary wave band light and stray light.

CCD and cmos device are further provided on the sensor.

The camera lens telescope end focal length with its be imaged the product of diameter again with its optical full length square ratio be (0.08,0.12)。

The whole focal length of the fixed lens group of described first and the ratio of its rear surface effective diameter are (0.73,0.96).

The zoom lens group meets: camera lens telescope end focal length and its focal length of wide-angle side difference and zoom The ratio of the lens group distance mobile from telescope end to wide-angle side change procedure is (1.41,1.84).

The fixed lens group of described second meets:Wherein, f_s3For the entirety of the second fixed lens group Focal length, f_wFor camera lens wide-angle side focal length.

The ratio of the front surface effective diameter focal length integrated therewith of the condenser lens group is (0.53,0.76).

Technical effect

Compared with prior art, the utility model only needs four pieces of eyeglasses that the Zoom structure of camera lens, while zoom can be realized 2.5 times or more；Focal length of the camera lens from wide-angle side to telescope end is held essentially constant, and will not be changed with the variation of multiplying power.

Detailed description of the invention

Fig. 1 is for the semi-cutaway of embodiment 1 and from wide-angle side to the moving direction figure of telescope end change procedure Zhong Ge group；

Fig. 2 is each aberration diagram of the wide-angle side of embodiment 1 relative to 1000nm；

Fig. 3 is each aberration diagram of the telescope end of embodiment 1 relative to 1000nm；

Fig. 4 is for the semi-cutaway of embodiment 2 and from wide-angle side to the moving direction figure of telescope end change procedure Zhong Ge group；

Fig. 5 is each aberration diagram of the wide-angle side of embodiment 2 relative to 1000nm；

Fig. 6 is each aberration diagram of the telescope end of embodiment 2 relative to 1000nm；

Fig. 7 is for the semi-cutaway of embodiment 3 and from wide-angle side to the moving direction figure of telescope end change procedure Zhong Ge group；

Fig. 8 is each aberration diagram of the wide-angle side of embodiment 3 relative to 1000nm；

Fig. 9 is each aberration diagram of the telescope end of embodiment 3 relative to 1000nm；

In figure: the first fixed lens group S1, zoom lens group S2, the second fixed lens group S3, condenser lens group S4, diaphragm STP, sensor IMG, germanium window GEF, protection glass CG, charge coupled device ccd, complementary metal oxide semiconductor CMOS, the One front lens G1, the first rear lens G2, the second front lens G3, the second rear lens G4.

Specific embodiment

Embodiment 1

As shown in Figure 1, the present embodiment successively includes: the first fixed lens group with positive light coke from the object side to image side S1, the zoom lens group S2 with negative power, aperture diaphragm STP, the with positive light coke second fixed lens group S3, have The condenser lens group S4 and sensor IMG of positive light coke.

The negative lens of the zoom lens group S2 improves the coma of camera lens telescope end using rotational symmetric aspheric, the The positive lens of two fixed lens group S3 improves color difference on the axis of camera lens wide-angle side, condenser lens group using rotational symmetric aspheric S4 increases negative lens to improve the coma of camera lens wide-angle side.

Germanium window GEF and protection glass CG, the germanium window are successively arranged between the condenser lens group S4 and sensor IMG GEF is to filter out unnecessary wave band light and stray light.

The side of the sensor IMG is equipped with charge coupled device ccd and complementary metal oxide semiconductor CMOS.

The fixed lens group S1 of described first is the lens of one piece of front surface evagination and rear surface indent, which is two-sided Rotational symmetric aspheric structure, diffraction order are single order.

The zoom lens group S2 is lens recessed outside one piece of surface.

The fixed lens group S3 and condenser lens group S4 of described second includes the lens of one piece of surface convex, which is Double-face rotating symmetric aspheres structure, diffraction order are single order.

1 the present embodiment lens optical parameter of table

Lens parameters	Wide-angle side	Between two parties	Telescope end
				Focal length	11.5	20	29.25
Suitable aperture	1.27	1.28	1.3
				Diameter is imaged	6.35	6.35	6.35

2 the present embodiment lens construction parameter of table

Surface serial number	Surface type	Radius of curvature	Thickness	Material
					1	Diffractive-aspherical	40.56	4.15	Germanium
2	Diffractive-aspherical	565.24	VAR
					3	It is aspherical	91.15	2.82	GaSir
4	It is aspherical	21.02	VAR
					Diaphragm	Spherical surface	Infinitely	2.53
6	Diffractive-aspherical	89.10	9.05	Germanium
					7	Diffractive-aspherical	5073.24	VAR
8	Diffractive-aspherical	65.55	14.00	Germanium
					9	Diffractive-aspherical	-160.34	VAR
10	Spherical surface	Infinitely	1.00	Germanium
					Sensor	Spherical surface	Infinitely	0.50

3 the present embodiment lens zoom parameter of table

4 the present embodiment camera lens asphericity coefficient of table

Surface serial number	K	A4	A6	A8	A10
						1	4.24E-01	-2.86E-07	1.16E-10	-1.07E-12	1.69E-15
2	1.88E+00	-1.10E-06	2.76E-11	1.59E-12	-6.84E-15
						3	0.00E+00	9.24E-05	-6.47E-07	3.43E-09	-1.09E-11
4	2.01E+00	6.46E-05	-2.36E-07	-4.66E-09	6.61E-11
						6	-3.47E+01	-2.11E-05	-3.04E-07	-3.62E-09	-8.40E-11
7	0.00E+00	-1.40E-05	-2.22E-07	-5.27E-10	2.37E-12
						8	-9.29E+00	-2.68E-05	-5.89E-08	-3.88E-11	7.45E-13
9	-5.47E+01	-7.57E-06	-8.27E-09	4.15E-10	2.72E-12

The present embodiment camera lens

The fixed lens group of described first

The zoom lens group's

The fixed lens group of described second

The condenser lens group's

As shown in Fig. 2, being each aberration diagram of the wide-angle side of the present embodiment relative to 1000nm, as can be seen: the camera lens exists Wide-angle side has good spherical aberration and curvature of the image, has the optics basis of high resolution.

As shown in figure 3, being each aberration diagram of the telescope end of the present embodiment relative to 1000nm, as can be seen: the camera lens exists Telescope end has good spherical aberration and curvature of the image, has the optics basis of high resolution.

Embodiment 2

As shown in figure 4, compared with Example 1, the zoom lens group S2 of the present embodiment successively includes: front surface evagination and after The first rear lens G2 with negative power of the first front lens G1 and concave surface with negative power of concave surface, In: the first rear lens G2 is Double-face rotating symmetric aspheres structure, and diffraction order is single order.

The condenser lens group S4 successively includes: the second front lens G3 and preceding table with positive light coke of surface convex The second rear lens G4 with negative power of face evagination and rear surface indent.

5 the present embodiment lens optical parameter of table

Lens parameters	Wide-angle side	Between two parties	Telescope end
				Focal length	10.5	20.8	29
Suitable aperture	1.15	1.21	1.21
				Diameter is imaged	7.05	7.05	7.05

6 the present embodiment lens construction parameter of table

Surface serial number	Surface type	Radius of curvature	Thickness	Material
					1	It is aspherical	38.98	4.22	Germanium
2	It is aspherical	55.19	VAR
					3	It is aspherical	201.67	1.26	GaSir
4	It is aspherical	20.72	5.04
					5	Diffractive-aspherical	346.39	2.36	Germanium
6	Diffractive-aspherical	96.89	VAR
					Diaphragm	It is aspherical	Infinitely	0.75
8	Diffractive-aspherical	26.01	3.48	Zinc sulphide
					9	Diffractive-aspherical	55.24	VAR
10	It is aspherical	21.57	7.19	GaSir
					11	It is aspherical	-221.02	1.13
12	It is aspherical	27.66	1.70	Zinc sulphide
					13	Spherical surface	16.45	VAR
14	Spherical surface	Infinitely	1.00	Germanium
					Sensor	Spherical surface	Infinitely	0.50

7 the present embodiment lens zoom parameter of table

Surface serial number	Wide-angle side	Between two parties	Telescope end
				2	0.92	8.91	12.42
6	12.25	4.25	0.75
				9	12.88	11.18	11.13
13	10.31	12.02	12.06

8 the present embodiment camera lens asphericity coefficient of table

The present embodiment camera lens

The fixed lens group of described first

The zoom lens group's

The fixed lens group of described second

The condenser lens group's

As shown in figure 5, being each aberration diagram of the wide-angle side of the present embodiment relative to 1000nm, as can be seen: the camera lens exists Wide-angle side has good spherical aberration and curvature of the image, has the optics basis of high resolution.

As shown in fig. 6, being each aberration diagram of the telescope end of the present embodiment relative to 1000nm, as can be seen: the camera lens exists Telescope end has good spherical aberration and curvature of the image, has the optics basis of high resolution.

Embodiment 3

As shown in fig. 7, compared with Example 1, the zoom lens group S2 of the present embodiment successively includes: front surface evagination and after The first rear lens G2 with negative power of the first front lens G1 and concave surface with negative power of concave surface.

9 the present embodiment lens optical parameter of table

Lens parameters	Wide-angle side	Between two parties	Telescope end
				Focal length	12	21	33
Suitable aperture	1.17	1.21	1.21
				Diameter is imaged	6.85	6.85	6.85

10 the present embodiment lens construction parameter of table

11 the present embodiment lens zoom parameter of table

Surface serial number	Wide-angle side	Between two parties	Telescope end
				2	1.81	8.30	11.41
6	10.96	4.47	1.36
				9	13.10	11.92	11.99
11	10.49	11.67	11.60

12 the present embodiment camera lens asphericity coefficient of table

Surface serial number	K	A4	A6	A8	A10
						1	4.09E-01	-3.78E-07	8.63E-10	-2.83E-12	2.85E-15
2	2.01E+00	-9.32E-07	9.70E-10	-1.70E-12	-1.79E-14
						3	1.16E+02	9.83E-05	-4.76E-07	3.19E-09	-1.48E-11
4	3.58E+00	3.72E-05	-7.45E-08	-4.49E-09	8.24E-11
						5	0.00E+00	-2.45E-04	3.80E-07	5.74E-09	-5.55E-11
6	4.47E+00	-5.36E-05	-9.14E-07	3.57E-09	1.50E-11
						8	-2.01E-01	-5.10E-06	-1.36E-08	-3.79E-09	3.09E-11
9	-1.37E+00	1.00E-05	-1.09E-07	-1.73E-09	7.01E-12
						10	-1.89E-02	-5.76E-06	2.24E-08	-2.44E-10	1.30E-12
11	2.54E-01	2.76E-05	-1.10E-06	4.98E-09	7.04E-12

The present embodiment camera lens

The fixed lens group of described first

The zoom lens group's

The fixed lens group of described second

The condenser lens group's

As shown in figure 8, being each aberration diagram of the wide-angle side of the present embodiment relative to 1000nm, as can be seen: the camera lens exists Wide-angle side has good spherical aberration and curvature of the image, has the optics basis of high resolution.

As shown in figure 9, being each aberration diagram of the telescope end of the present embodiment relative to 1000nm, as can be seen: the camera lens exists Telescope end has good spherical aberration and curvature of the image, has the optics basis of high resolution.

Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the utility model principle and objective with Different modes carries out local directed complete set to it, and the protection scope of the utility model is subject to claims and not by above-mentioned specific Implementation is limited, and each implementation within its scope is by the constraint of the utility model.

Claims

1. a kind of characteristic far infrared optical system for having zoom function, which is characterized in that from the object side to image side successively include: to have just The fixed lens group of the first of focal power, the zoom lens group with negative power, aperture diaphragm, second with positive light coke are consolidated Fix-focus lens group, the condenser lens group with positive light coke and sensor；

At least one piece is equipped in the zoom lens group has negative power and using the lens of rotational symmetric aspheric to change The coma of kind camera lens telescope end；

At least one piece is equipped in the fixed lens group of described second with positive light coke and using the lens of rotational symmetric aspheric Color difference on axis to improve camera lens wide-angle side.

2. the characteristic far infrared optical system according to claim 1 for having zoom function, characterized in that the condenser lens At least one piece lens with negative power are equipped in group to improve the coma of camera lens wide-angle side.

3. the characteristic far infrared optical system according to claim 1 or 2 for having zoom function, characterized in that described first Fixed lens group includes the lens of one piece of front surface evagination and rear surface indent, which is Double-face rotating symmetric aspheres knot Structure, diffraction order are single order；

The zoom lens group includes lens recessed outside one piece of surface；

The fixed lens group of described second and condenser lens group include the lens of one piece of surface convex, which is Double-face rotating Symmetric aspheres structure, diffraction order are single order.

4. the characteristic far infrared optical system according to claim 1 or 2 for having zoom function, characterized in that the zoom Lens group successively includes: front surface evagination and rear surface indent with the first front lens of negative power and the tool of concave surface There is the first rear lens of negative power.

5. the characteristic far infrared optical system according to claim 4 for having zoom function, characterized in that mirror after described first Piece is Double-face rotating symmetric aspheres structure, and diffraction order is single order；

The condenser lens group successively includes: the second front lens with positive light coke and front surface evagination of surface convex and The second rear lens with negative power of rear surface indent.

6. the characteristic far infrared optical system according to claim 1 for having zoom function, characterized in that the camera lens is visible The focal length of distal end with its be imaged the product of diameter again with its optical full length square ratio be (0.08,0.12).

7. the characteristic far infrared optical system according to claim 1 or 2 for having zoom function, characterized in that described first The whole focal length of fixed lens group and the ratio of its rear surface effective diameter are (0.73,0.96).

8. the characteristic far infrared optical system according to claim 1 or 2 for having zoom function, characterized in that the zoom Lens group meets: camera lens telescope end focal length and its focal length of wide-angle side difference and zoom lens group from telescope end to wide The ratio of the mobile distance of angle end change procedure is (1.41,1.84).

9. the characteristic far infrared optical system according to claim 1 or 2 for having zoom function, characterized in that described second The whole focal length and camera lens of fixed lens group are (2.84,3.03) in the ratio of the focal length of wide-angle side.

10. the characteristic far infrared optical system according to claim 1 or 2 for having zoom function, characterized in that the focusing The ratio of the front surface effective diameter focal length integrated therewith of lens group is (0.53,0.76).