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Zoom lens and imaging device having zoom lens

A technology of zoom lens and negative lens, which is applied in the field of zoom lens

Active Publication Date: 2022-07-26
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is effective to have the super wide-angle lens be a retrofocus type with a configuration in which a lens unit with negative refractive power is disposed on the object side and a lens unit with positive refractive power is disposed on the image side, but in this case, there are Necessary to properly correct for lateral chromatic aberration and field curvature

Method used

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  • Zoom lens and imaging device having zoom lens
  • Zoom lens and imaging device having zoom lens
  • Zoom lens and imaging device having zoom lens

Examples

Experimental program
Comparison scheme
Effect test

example 1

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example 2

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[0120] reference now Figure 7 , an illustrative digital camera (imaging device 10 ) using the zoom lens for the imaging optical system according to each embodiment will be described. Figure 7 is a schematic diagram of the imaging device 10 including the zoom lens according to each embodiment.

[0121] exist Figure 7 Among them, reference numeral 13 denotes a camera body, and reference numeral 11 denotes an imaging optical system including any one of the zoom lenses 1a to 1c described in the first to third embodiments. Reference numeral 12 denotes a solid-state image sensor (photoelectric conversion device) such as a CCD sensor and a CMOS sensor, which receives an optical image formed by the imaging optical system 11 and performs photoelectric conversion. The camera body 13 may be a so-called single-len...

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Abstract

A zoom lens and an imaging device having the zoom lens are disclosed. The zoom lens includes, in order from the object side to the image side, a first lens unit having a negative refractive power and a rear group including at least one lens unit having a positive refractive power as a whole. During zooming from the wide-angle end to the telephoto end, the distance between adjacent lens units changes. The first lens unit includes at least three single negative lenses, and predetermined conditions are satisfied.

Description

technical field [0001] The present invention generally relates to a zoom lens and an imaging device (image pickup device) having the zoom lens, and more particularly, to a zoom lens suitable for imaging devices such as digital cameras, video cameras, surveillance cameras, and in-vehicle cameras. Background technique [0002] Imaging devices such as digital cameras and video cameras have recently used an increased number of pixels of solid-state image sensors such as CCD sensors and CMOS sensors, and zoom lenses for the imaging devices are required to have high optical performance. [0003] Japanese Patent Laid-Open No. ("JP") 2017-68114 discloses a fisheye zoom lens that can obtain good optical performance at a predetermined zoom ratio while ensuring the back focus in the shortest focal length state. [0004] It is effective to make the ultra-wide-angle lens a retrofocus type having a configuration in which a lens unit with negative refractive power is arranged on the object...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/14
CPCG02B15/14G02B15/144513G02B15/144515G02B15/177G02B15/20G02B27/0025G02B13/009H04N23/69
Inventor 斋藤慎一郎
Owner CANON KK