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Far-infrared optical system with zoom function

A technology of infrared optical system and function, applied in the field of far-infrared optical system, can solve the problem of insufficient peripheral brightness ratio

Pending Publication Date: 2018-09-14
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a far-infrared optical system with a zoom function, introduces a rotating back-fold aspheric surface to solve the problem of insufficient peripheral light ratio, and realizes imaging of the far-infrared. At the same time, the lens has a zoom function and HD imaging performance

Method used

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  • Far-infrared optical system with zoom function
  • Far-infrared optical system with zoom function
  • Far-infrared optical system with zoom function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, this embodiment includes in order from the object side to the image side: the first fixed lens group S1 with positive refractive power, the zoom lens group S2 with negative refractive power, the aperture stop STP, the second fixed lens group with positive refractive power Fixed lens group S3, focusing lens group S4 with positive power and sensor IMG.

[0031] The negative lens of the zoom lens group S2 uses a rotationally symmetrical aspheric surface to improve the coma aberration at the telephoto end of the lens, the positive lens of the second fixed lens group S3 uses a rotationally symmetrical aspheric surface to improve the axial chromatic aberration at the wide-angle end of the lens, and the focusing lens Group S4 adds a negative lens to improve coma aberration at the wide-angle end of the lens.

[0032] A germanium window GEF and a protective glass CG are sequentially arranged between the focusing lens group S4 and the sensor IMG, and t...

Embodiment 2

[0054] Such as Figure 4 As shown, compared with Embodiment 1, the zoom lens group S2 of this embodiment sequentially includes: the first front lens G1 with negative refractive power having a convex front surface and a concave rear surface; The focal power of the first rear lens G2, wherein: the first rear lens G2 is a double-sided rotationally symmetrical aspherical structure, and its diffraction order is the first order.

[0055] The focusing lens group S4 sequentially includes: a second front lens G3 with a convex surface and a positive refractive power, and a second rear lens G4 with a negative refractive power with a convex front surface and a concave rear surface.

[0056] Table 5 Optical parameters of the lens of this embodiment

[0057]

[0058]

[0059] Table 6 Lens structure parameters of this embodiment

[0060] Surface serial number

surface type

radius of curvature

thickness

Material

1

Aspherical

38.98

4.22

germa...

Embodiment 3

[0074] Such as Figure 7 As shown, compared with Embodiment 1, the zoom lens group S2 of this embodiment sequentially includes: the first front lens G1 with negative refractive power having a convex front surface and a concave rear surface; focal power of the first rear lens G2.

[0075] Table 9 Optical parameters of the lens of this embodiment

[0076] Lens parameters

wide-angle end

in the center

telephoto end

focal length

12

21

33

equivalent aperture

1.17

1.21

1.21

Imaging circle diameter

6.85

6.85

6.85

[0077] Table 10 Lens structure parameters of this embodiment

[0078]

[0079]

[0080] Table 11 Lens zoom parameters of this embodiment

[0081] Surface serial number

wide-angle end

in the center

telephoto 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

[0082] Table 12 As...

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Abstract

The invention provides a far-infrared optical system with a zoom function. The system comprises a first fixed lens group with positive power, a zoom lens group with negative power, an aperture stop, asecond fixed lens group with positive power, a focusing lens group with positive power and a sensor from an object side to an image side. The zoom lens group moves from the object side to the image side along an optical axis to realize zooming from a wide-angle end to a telephoto end, and the focusing lens group moves along the optical axis to realize the correction of a virtual focal problem caused by a zooming process and an object distance changing process. According to the system, a rotating refraction aspheric surface is introduced to solve the problem of an insufficient peripheral lightratio, and the imaging of far infrared is achieved. A zoom structure of the lenses can be realized only with four lenses, and at the same time, the zoom is 2.5 time or higher. The focal lengths of the lenses from the wide-angle end to the telephoto end are basically constant and do not change with the change of magnification.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a far-infrared optical system with a zoom function. Background technique [0002] Organic life such as the human body will naturally radiate light in the far-infrared band, so the far-infrared imaging lens can realize human imaging in a completely dark environment without relying on any additional light source. Therefore, as a supplement to the visible light and near-infrared imaging system in the security monitoring system, the far-infrared lens is of great significance. First of all, during the zooming process of the two-group zoom structure in the prior art, the aperture diameter of the lens changes drastically, the focal length at the telephoto end is large, and the shooting effect is not good; Limited to the zoom mode, a space of the same aperture size must be reserved in the entire moving range of the front group, so the front aperture of this type of lens is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14
CPCG02B15/14
Inventor 厉冰川盛亚茗尚洁阳
Owner JIAXING ZHONGRUN OPTICAL TECH