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Varifocal optical system

An optical system and variable focal length technology, applied in optics, optical components, instruments, etc., can solve the problems of large size and extremely high imaging capability, and achieve the effect of small size, compact optical system, and short overall length

Active Publication Date: 2019-11-22
JIAXING ZHONGRUN OPTICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 4K ultra-high-definition (eight megapixels) camera technology has gone deep into the stage of widespread promotion from a concept, but the 4K resolution requires extremely high imaging capabilities of the lens, so the size of a lens with a common structure cannot be avoided. , 4-megapixel lens is much larger

Method used

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Examples

Experimental program
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Embodiment 1

[0046] Such as figure 1As shown, it is a schematic cross-sectional view of the wide-angle end, intermediate magnification, and telephoto end of the zoom optical system of this embodiment. The zoom optical system is arranged sequentially from the object plane side to the image plane side, including the first fixed lens group with positive power, the main zoom lens group with negative power, diaphragm, and The positive second fixed lens group, the focusing lens group with negative refractive power, and the auxiliary zoom lens group with positive refractive power, wherein: the first fixed lens group and the second fixed lens group are always in a fixed state, through The main zoom lens group moves from the object side to the image side along the optical axis as the main zoom group, and the auxiliary zoom lens group corresponds to the position of the main zoom lens group and moves from the object side to the image side along the optical axis , so that the field of view of the len...

Embodiment 2

[0076] Such as image 3 As shown, it is a schematic cross-sectional view of the wide-angle end, intermediate magnification, and telephoto end of the zoom optical system of this embodiment. Compared with Embodiment 1, in this embodiment, the second lens A2 of the first fixed lens group A is a spherical lens with positive convex and concave refractive power, and the auxiliary zoom lens group E is the thirteenth lens E1. Specifically, it is a biconvex aspheric mirror with positive refractive power.

[0077] The specific settings of the zoom optical system in the present embodiment are as follows:

[0078] Wide-angle end focal length f W =6.05mm, telephoto end focal length f T =118.4mm; wide-angle end aperture number FNO W=1.51, the aperture number FNO at the telephoto end T =4.03; wide-angle end half field of view ω W =40.0°, telephoto end half field of view ω T =2.19°; the total optical length of the optical system (that is, the distance from the center apex of the front ...

Embodiment 3

[0098] Such as Figure 5 , which is a schematic cross-sectional view of the wide-angle end, intermediate magnification, and telephoto end of the zoom optical system of this embodiment. Compared with Embodiment 1, in this embodiment, after the seventh lens B3 of the main variable power lens group B, a spherical lens B4 with negative front concave and back convex power is further added.

[0099] The specific settings of the zoom optical system in the present embodiment are as follows:

[0100] Wide-angle end focal length f W =6.52mm, telephoto focal length f T =124.0mm; wide-angle end aperture number FNO W =1.60, the aperture number FNO at the telephoto end T =4.31; wide-angle end half field of view ω W =36.3°, telephoto end half field of view ω T =2.05°; the total optical length of the optical system (that is, the distance from the center apex of the front surface of the first lens to the image plane) TTL=94.7mm.

[0101]

[0102]

[0103] The corresponding cone co...

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Abstract

The invention discloses a varifocal optical system. The system sequentially comprises a first fixed lens group with positive focal power, a main zoom lens group with negative focal power, a diaphragm,a second fixed lens group with positive focal power, a focusing lens group with negative focal power, an auxiliary zoom lens group with positive focal power and an imaging surface from an object plane side to an image plane side; the auxiliary zoom lens groups are in one-to-one correspondence with the main zoom lens groups in position and move from the object side to the image plane side along the optical axis. The focusing lens group moves correspondingly to the position, the imaging wavelength, the temperature and the imaging object distance of the main zoom lens group along the optical axis, and the zoom is corrected and focused, so that stable imaging can be realized on an imaging surface in a focal length changing process. While 4K resolution, large aperture and infrared confocal performance are realized, the total length of the optical system is greatly shortened, the structure is more compact, and the popularization of 4K camera shooting is facilitated.

Description

technical field [0001] The invention relates to a technology in the field of optical equipment, in particular to a 1 / 1.8" target zoom optical system with three groups of linkages supporting eight million pixels. Background technique [0002] 4K ultra-high-definition (eight megapixels) camera technology has gone from a concept to a stage of widespread promotion, but the 4K resolution requires extremely high imaging capabilities of the lens, so the size of a lens with a common structure cannot be avoided. , The 4-megapixel lens is much larger. How to achieve a substantial increase in resolution while keeping the size and volume of the lens comparable to the original lens is a technical problem that the optical system needs to solve urgently. Contents of the invention [0003] The present invention proposes a variable focal length optical system aiming at the above-mentioned deficiencies existing in the prior art. [0004] The present invention is achieved through the follo...

Claims

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Application Information

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IPC IPC(8): G02B15/16
CPCG02B15/16
Inventor 葛航笠江秉儒盛亚茗尚洁阳
Owner JIAXING ZHONGRUN OPTICAL TECH
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