CN202975461U - Compact type continuous zooming optical lens with wide spectrum - Google Patents

Abstract

The utility model, which belongs to the visible light imaging field of the applied optics, relates to a compact type continuous zooming optical lens with a wide spectrum, wherein the imaging waveband is 0.45 micrometers to 1 micrometer. And the provided lens is mainly applied to the remote monitoring fields like national defense monitoring, civil monitoring, and forest fire prevention and the like. The lens is mainly composed of four parts: a positive-group refractor group as a first group, a negative-group refractor group as a second group, a positive-group refractor group as a third group, and a positive-group refractor group as a fourth group by starting from an object space. The second refractor group and the third refractor group make relative motions according to a certain rule during the zooming process; due to the zoom lens utilization, optical amplification and reduction on the same object can be carried out conveniently; and because of the utilization of the same lens, the searching in a large range and amplification identification of the object can be realized, thereby realizing convenient monitoring.

Description

Wide spectrum, compact continuous zooming optical camera lens

Technical field

The utility model relates to a kind of optical lens, and being specifically related to a kind of focal length is 16.74mm～242mm, has the zoom Visible imaging system of 14.5 times of focal length amplifications, wide spectrum, compact, is applicable to remote monitor.

Background technology

The supervision such as forest fire protection and road traffic requires and can carry out extensive search to target in visible light wave range with television cameras, can carry out details to the target of paying close attention to again and differentiate, also require simultaneously can satisfy these needs at broadband, compact continuous zooming optical system that wave band 950 μ m place images do not defocus.The utility model adopts domestic common used material to design exactly, and is relatively simple for structure, a kind of utility model patent that system's overall length and relative aperture are more rational, every imaging index meets the demands.

Existing most of domestic and international patent such as US2004/0169934A1,4468097 only limit to for visible light wave range, and near infrared mist transmitting performance approximately reaches 1.4 times of visible light, therefore can make optical system work in high light, low-light or have the weather conditions such as mist, rain, dirt to descend.

Summary of the invention

In order to overcome the shortcoming of prior art, the utility model provides a kind of wide spectrum, compact continuous zooming optical camera lens, and it is simple in structure, and cost is low, is applicable to remote monitor.

The technical scheme in the invention for solving the technical problem is: S comprises the first lens group G1 of positive diopter successively from the object side to the image side; Negative dioptric the second lens combination G2; The 4th lens combination G4 of negative dioptric the 3rd lens combination G3 and positive diopter, wherein first lens group G1 and the 4th lens combination G4 position are fixed, the 3rd lens combination G3 that is used for the second lens combination G2 of zoom and affords redress is removable, mobile the second lens combination G2 and make the focal length variations of whole camera lens, cause image planes to move after mobile the 3rd lens combination G3 compensates zoom, the position of imaging surface is remained immobilize; Satisfy following relational expression:

0.45≤f1/ft≤0.49 formula 1

0.41≤f2/f3≤0.46 formula 2

Wherein, f1 is the focal length value of first mirror group G1, and f2 is the focal length value of the second mirror group G2, and f3 is the focal length value of the 3rd mirror group G3, and ft is system's focal length value of the longest Jiao.

The wide spectrum of the utility model, compact, zoom, visual light imaging; Optical system adopts positive and negative, negative, positive four lens group structures, and the position of first lens group and the 4th lens combination and image planes is immobilized, make the focal length variations of whole camera lens by mobile the second lens combination, cause image planes to move after mobile the 3rd lens combination compensates zoom, guarantee imaging clearly.Whole continuous magnification lens is in visible light and near-infrared band imaging, 14.5 times of zoom ratios, and material is general, and lens construction is simple, and not only cost is low, and reliability is high, and excellent optical performance.Meet the requirement of scale of mass production, have good market outlook.

Description of drawings

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Fig. 1 is the utility model schematic diagram;

Fig. 2 is the shortest burnt position view of the utility model;

Fig. 3 is burnt position view in the middle of the utility model;

Fig. 4 is the longest burnt position view of the utility model;

Fig. 5 is the shortest burnt position MTF figure of the utility model;

Fig. 6 is burnt position MTF figure in the middle of the utility model;

Fig. 7 is the longest burnt position MTF figure of the utility model;

Fig. 8 is the structural representation (150 ° of cam angles, 0.25 ° of single step-length) of zoom cam in the utility model.

Embodiment

As shown in Fig. 1-4, S comprises the first lens group G1 of positive diopter successively from the object side to the image side; Negative dioptric the second lens combination G2; The 4th lens combination G4 of negative dioptric the 3rd lens combination G3 and positive diopter, wherein first lens group G1 and the 4th lens combination G4 position are fixed, the 3rd lens combination G3 that is used for the second lens combination G2 of zoom and affords redress is removable, mobile the second lens combination G2 and make the focal length variations of whole camera lens, cause image planes to move after mobile the 3rd lens combination G3 compensates zoom, the position of imaging surface is remained immobilize; Satisfy following relational expression:

0.45≤f1/ft≤0.49 formula 1

0.41≤f2/f3≤0.46 formula 2

Wherein, f1 is the focal length value of first mirror group G1, and f2 is the focal length value of the second mirror group G2, and f3 is the focal length value of the 3rd mirror group G3, and ft is system's focal length value of the longest Jiao.

The bifocal that described first lens group G1 comprises a positive light coke closes the lens L13 of lens L11, L12, a negative power, the lens L14 of a positive light coke; The bifocal that described the second lens combination G2 comprises a negative power closes the lens L23 of lens L21, L22 and a positive light coke; Described the 3rd lens combination G3 comprises the lens L31 of a negative power; Described the 4th lens combination G4 comprises lens L41, the L44 of two positive light cokes, the bifocal of a negative power closes the lens L45 of lens L42, L43 and a negative power.

Described first, second, third and fourth lens combination G1, G2, G3, each lens parameter of G4 see Table 1.

7 aspheric surface parameters in table 1 are K:0; A:6.802455e-008; B:1.755169e-011; C:-1.569352e-014; D:4.309848e-017.

19 aspheric surface parameters in table 1 are K:-8.8078; A:0, B:-2.960152e-009; C:-1.413102e-012; D:-1.844682e-014.

The position set justice of the optical axis direction of aspheric surface take the face fixed point as benchmark is as follows:

Z＝(1/R)Y^2/[1+【1-(1+K)(Y/R)^2】^1/2]+A(Y^4)+B(Y^6)+C(Y^8)+D(Y^10)

Z wherein: the position of optical axis direction becomes; Y: the height of optical axis; R: paraxial radius-of-curvature; The K:Conic coefficient

A, B, C: asphericity coefficient; ^2: quadratic power; ^4: biquadratic; ^6: six powers; ^8: eight power; ^10: ten powers.

Adopt above-mentioned design parameter can realize the variation adjustment of focal length in 16.74mm～242mm scope, realize 14.5 Zoom Lens.

The material of described first, second, third and fourth lens combination G1, G2, G3, G4 is ZBAF3, LAF3, LAF4, ZF6, ZF5, K9 or QK3.

Fig. 4 is the longest burnt position view of the utility model; Fig. 5 is the shortest burnt position MTF figure of the utility model; Fig. 6 is burnt position MTF figure in the middle of the utility model; Fig. 7 is the longest burnt position MTF figure of the utility model; Fig. 8 is the structural representation (150 ° of cam angles, 0.25 ° of single step-length) of zoom cam in the utility model.

D7, D14, D16 are mechanical variable interval.

Claims (5)

1. a wide spectrum, compact continuous zooming optical camera lens, it is characterized in that: (S) comprises the first lens group (G1) of positive diopter successively from the object side to the image side; Negative dioptric the second lens combination (G2); The 4th lens combination (G4) of negative dioptric the 3rd lens combination (G3) and positive diopter, wherein first lens group (G1) and the 4th lens combination (G4) position are fixed, the 3rd lens combination (G3) that is used for second lens combination (G2) of zoom and affords redress is removable, mobile the second lens combination (G2) and make the focal length variations of whole camera lens, cause image planes to move after mobile the 3rd lens combination (G3) compensates zoom, the position of imaging surface is remained immobilize; Satisfy following relational expression:

0.45≤f1/ft≤0.49 formula 1

0.41≤f2/f3≤0.46 formula 2

Wherein, f1 is the focal length value of first mirror group (G1), and f2 is the focal length value of the second mirror group (G2), and f3 is the focal length value of the 3rd mirror group (G3), and ft is system's focal length value of the longest Jiao.

2. wide spectrum according to claim 1, compact continuous zooming optical camera lens, it is characterized in that: the bifocal that described first lens group (G1) comprises a positive light coke closes the lens (L13) of lens (L11, L12), a negative power, the lens (L14) of a positive light coke; The bifocal that described the second lens combination (G2) comprises a negative power closes the lens (L23) of lens (L21, L22) and a positive light coke; Described the 3rd lens combination (G3) comprises the lens (L31) of a negative power; Described the 4th lens combination (G4) comprises the lens (L41, L44) of two positive light cokes, the bifocal of a negative power closes the lens (L45) of lens (L42, L43) and a negative power.

3. wide spectrum according to claim 1, compact continuous zooming optical camera lens, it is characterized in that: described first, second, third and fourth lens combination G1, G2, G3, each lens parameter of G4 see Table 1.

4. wide spectrum according to claim 3, compact continuous zooming optical camera lens, it is characterized in that: 7 aspheric surface parameters in table 1 are K:0; A:6.802455e-008; B:1.755169e-011; C:-1.569352e-014; D:4.309848e-017;

19 aspheric surface parameters in table 1 are K:-8.8078; A:0, B:-2.960152e-009; C:-1.413102e-012; D:-1.844682e-014;

The position set justice of the optical axis direction of aspheric surface take the face fixed point as benchmark is as follows:

Z＝(1/R)Y^2/[1+【1-(1+K)(Y/R)^2】^1/2]+A(Y^4)+B(Y^6)+C(Y^8)+D(Y^10)

Z wherein: the position of optical axis direction becomes; Y: the height of optical axis; R: paraxial radius-of-curvature; The K:Conic coefficient

A, B, C: asphericity coefficient; ^2: quadratic power; ^4: biquadratic; ^6: six powers; ^8: eight power; ^10: ten powers.

5. wide spectrum according to claim 1, compact continuous zooming optical camera lens, it is characterized in that: the material of described first, second, third and fourth lens combination (G1, G2, G3, G4) is ZBAF3, LAF3, LAF4, ZF6, ZF5, K9 or QK3.

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