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Large-aperture large-multiplying-power zoom lens

A zoom lens and large magnification technology, applied in optics, optical components, instruments, etc., can solve the problems that cannot meet the needs of the future, and achieve the effect of increasing the range of field of view, improving resolution, and reducing volume

Pending Publication Date: 2018-02-02
DONGGUAN YUTONG OPTICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing common high-magnification zoom lenses usually have an aperture of F2.0-F5.0; a zoom ratio of 20-30 times; and an image quality of about 1.3-2 million pixels. Some technical indicators can no longer meet future needs

Method used

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Embodiment Construction

[0026] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. The accompanying drawings are only for reference and description, and do not constitute a limitation to the protection scope of the present invention.

[0027] Please refer to figure 1 and figure 2 , the large-aperture large-magnification zoom lens of the present invention includes in sequence along the incident light: a front fixed group 1, a zoom group 2, a middle fixed group 3 and a focusing group 4, wherein the total optical power of the front fixed group 1 is positive, the total optical power of the middle fixed group 3 is positive, the total optical power of the variable power group 2 is negative, the total optical power of the focusing group 4 is negative, the variable power group 2 and The relative position of the focusing group 4 is adjustable, and the focal length of the focusing group 4 and the focal length of the zoom group 2 satisfy...

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Abstract

The present invention relates to the technical field of optical equipment, in particular to a large-aperture large-magnification zoom lens, which sequentially includes a front fixed group, a zoom group, a middle fixed group and a focusing group along the incident light, and the total optical power of the front fixed group is positive , the total optical power of the middle fixed group is positive, the total optical power of the variable power group is negative, the total optical power of the focusing group is negative, the variable power group and the focusing group The relative position is adjustable, and the focal length of the focusing group and the focal length of the zoom group satisfy the following relationship: 0.25<|Bf' / Ff'|<1.6; wherein, the Bf' is the focal length of the zoom group , the Ff' is the focal length of the focus group. The invention realizes the functions of reducing the volume of the lens, increasing the variation range of the viewing angle, and improving the resolution.

Description

technical field [0001] The invention relates to the technical field of optical equipment, in particular to a zoom lens with a large aperture and a large magnification. Background technique [0002] Fields such as large squares, road monitoring, and forest fire prevention require both a large-scale overview and the ability to zoom in and track key targets. Therefore need a kind of large magnification zoom lens that can automatically zoom and take into account wide-angle and telephoto. [0003] The existing zoom lens optical structure has 2 components and multi-components (usually with more than 3 groups), wherein the 2 components structure has a smaller volume, but its magnification is also smaller, usually less than 4.5 times, and The multi-element structure has a larger magnification, which can usually reach more than 10 times, and if a 4-group structure is used, it can also achieve a magnification of more than 20 times. [0004] The existing common high-magnification zoo...

Claims

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Application Information

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IPC IPC(8): G02B15/177
CPCG02B15/177
Inventor 何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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