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Zoom lens system

一种变焦透镜、透镜的技术，应用在变焦透镜系统领域

Inactive Publication Date: 2005-04-06
NIKON CORP
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Problems solved by technology

[0003] However, according to recent advances in imaging technology, such as the miniaturization of the pixel pitch of imaging devices, it is difficult to achieve both high optical performance (especially color shift) and compactness with a simple mechanism

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Embodiment Construction

[0035] Preferred embodiments of the present invention will be described below with reference to the attached drawings.

[0036] The characteristics of the multi-group type zoom lens system will be described in general. Since at least two lens groups are required to configure a zoom lens system, a multi-group type zoom lens system is assumed to have a lens structure of three lens groups or more.

[0037] In a multi-group type zoom lens system, a high zoom ratio is achieved by increasing the number of lens groups responsible for zooming. Since the burden of correcting aberrations of each lens group is easily averaged, excellent optical performance can be obtained. However, when the number of lens groups moving along the optical axis increases, the mechanism of the lens barrel becomes more complicated, which easily increases the manufacturing cost. In the multi-group type zoom lens system according to the present invention, a three-group type zoom lens system including a first ...

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Abstract

Provided is a zoom lens system having high optical performance by using a diffractive optical element, the system includes a first group having positive power, a second group having negative power, and a third group having positive power. When zooming from a wide-angle end state to a telephoto end state, a distance between the first group and the second group and a distance between the second group and the third group vary. The third group is composed of a front group having positive power locating to the object side of the largest space in the third group and a rear group having negative power locating to an image side of the space. The front group includes an aperture stop and a diffractive optical surface. An incident angle of a principal ray reaching the maximum image height to the diffractive optical surface is ten degrees or less. Given condition is satisfied.

Description

field of invention [0001] The present invention relates to zoom lens systems with diffractive optical elements suitable for film cameras, image cameras and digital still cameras. Background of the invention [0002] With the advancement of technology, various types of zoom lens systems have been proposed. As an optical system for film cameras, image cameras, and especially for digital still cameras, a three-group type zoom lens system, also called a telephoto type zoom lens system, has The structure of positive-negative-positive refractive power according to the focal length. As for such examples, it is disclosed in Japanese Patent Application Laid-Open No. 11-305126. [0003] However, according to recent advances in imaging technology, such as miniaturization of the pixel pitch of imaging devices, it is difficult to achieve both high optical performance (especially color shift) and compactness with a simple mechanism. Contents of the invention [0004] The present inve...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20G02B13/18G02B15/173
CPCG02B15/173G02B15/143105
Inventor 铃木宪三郎
Owner NIKON CORP
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