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Zoom lens and imaging apparatus

A technology of zoom lens and lens group, which is applied in the fields of zoom lens, camera device using this zoom lens, and small high-performance zoom lens. Effect

Inactive Publication Date: 2010-12-15
SONY GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in the case where the zoom lens is applied to a barrel-contractable type imaging device in which the lens barrel can be extended and retracted, such a zoom lens prevents shortening of the entire length in the retracted state.

Method used

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  • Zoom lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0102] Embodiments of the zoom lens and imaging device of the present invention are described below.

[0103] First, a zoom lens of one embodiment of the present invention will be described.

[0104] The zoom lens of this embodiment of the present invention includes a first lens group with negative refractive power, a second lens group with positive refractive power, and a third lens group with positive refractive power arranged in this order from the object side to the image side.

[0105] During zooming of the zoom lens from the wide-angle end to the telephoto end, the first lens group moves, and the second lens group moves toward the object together with the aperture, so that the air space between the first lens group and the second lens group decreases. small, and increases the air space between the second lens group and the third lens group.

[0106] By forming the diaphragm to move together with the second lens group, a driving mechanism for changing the aperture diamet...

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PUM

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Abstract

A zoom lens includes: first, second and third lens groups having negative refracting power, positive refracting power and positive refracting power, respectively, disposed in the order from an object side. During zooming from a wide angle end to a telephoto end, the first lens group is moved and the second lens group is moved together with a stop toward the object such that an air space between the first and second lens groups decreases and an air space between the second and third lens groups increases. The second lens group includes positive and negative lenses aspherically shaped on at least a side thereof facing the object and having a convex or concave surface facing the object, the negative lens being positioned on the image side of the positive lens. The zoom lens is configured to satisfy the following Conditional Expressions (1) and (2) 0.7<R2f / R2r<2.0 (1) 1.0<[absolute value of (Sga / Sgs)]<1.5 (2).

Description

[0001] TECHNICAL FIELD The present invention relates to a zoom lens and an imaging device. More specifically, the present invention relates to the technical field of small-sized high-performance zoom lenses applicable to imaging optical systems of digital input / output devices such as digital still cameras and digital video cameras, and the technology of imaging devices using such zoom lenses field. Background technique [0002] In recent years, imaging devices such as digital still cameras using solid-state imaging elements have become popular. With the popularization of devices such as digital still cameras, it is desired to provide an imaging device with higher image quality. Especially in devices such as digital still cameras, it is desired to provide an imaging lens, especially a zoom lens, having excellent focusing performance corresponding to a solid-state imaging element having a large number of pixels. [0003] In addition to requiring higher image quality, the requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177H04N5/225
CPCG02B15/177G02B27/646G02B15/143507
Inventor 黑田大介
Owner SONY GRP CORP
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