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Zoom lens and camera with zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses

Inactive Publication Date: 2014-05-14
CASIO COMPUTER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a strong desire to install a zoom lens in a video camera, etc.

Method used

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  • Zoom lens and camera with zoom lens
  • Zoom lens and camera with zoom lens
  • Zoom lens and camera with zoom lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Table 1 shows numerical examples for the first embodiment of the zoom lens of the present invention. exception, figure 1 is the lens composition diagram, figure 2 is its aberration diagram. In the tables and figures, f represents the focal length of the entire system of the lens (the values ​​from the left side to the wide-angle end, the middle area, and the telephoto end are indicated below), and F no Indicates the F number (number), and 2ω indicates the entire viewing angle of the lens. In addition, R represents the radius of curvature, D represents the lens thickness or lens spacing, υ d Indicates the Abbe number of the d-line. In the spherical aberration diagrams of the various aberration diagrams, d, g, and C represent aberration curves at respective wavelengths, respectively. In addition, S.C. represents a sine condition. S in the astigmatism diagram represents a sagittal direction, and M represents a meridional direction (meridional).

[0111] 【Table 1】 ...

Embodiment 2

[0114] Table 2 shows numerical examples for the second embodiment of the zoom lens of the present invention. in addition image 3 Indicates its lens composition diagram, Figure 4 is its aberration diagram.

[0115] 【Table 2】

[0116]

Embodiment 3

[0118] Table 3 shows numerical examples for the third embodiment of the zoom lens of the present invention. in addition Figure 5 Indicates its lens composition diagram, Figure 6 is its aberration diagram.

[0119] 【table 3】

[0120]

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PUM

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Abstract

There is provided a zoom lens of variable power ratio of the order of 3 in which the whole of the zoom lens is made up of three lens elements groups and the power configuration of each of the groups has an arrangement of negative, positive and negative, whereby the reduction in overall length of its optical system is enabled, so that a compact zoom lens and a camera with it can be provided. The zoom lens comprising, sequentially from an object side thereof, a first lens elements group has a negative refraction power as a whole, a second lens elements group has a positive refraction power as a whole and the third lens element group has a negative refraction power as a whole, and a variable power is realized by shifting the positions of the first and second lens elements group in the direction of an optical axis thereof.

Description

[0001] This application is the second application of the application number 200710005794.0 (the application number of the divisional application is "201210187056.3") filed by the applicant on February 13, 2007, and the title of the invention is "zoom lens and video camera with zoom lens". Divisional application. technical field [0002] The present invention mainly relates to a high-performance bright (small F number) zoom lens used in a compact imaging device using images such as a CCD (charged coupled device) mounted in a digital still camera or the like. sensor. Background technique [0003] In a compact digital still camera, a single-focus lens capable of reducing the size of the optical axis direction as much as possible is used in order to reduce the thickness of the camera body. In addition, efforts have also been made to produce a lens such as that disclosed in Japanese Patent Application Laid-Open No. 2002-228922 (Patent Document 1). Creation and commercialization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177
CPCG02B15/143503
Inventor 川上悦郎
Owner CASIO COMPUTER CO LTD