IMAGE PICKUP LENS AND IMAGE PICKUP APPARATUS

Title:

IMAGE PICKUP LENS AND IMAGE PICKUP APPARATUS

Document Type and Number:

Japanese Patent JP2014137540

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To achieve reduction in total length of a lens while securing focusing operation at high speed.SOLUTION: An image pickup lens includes: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having negative refractive power, arranged in order from an object side to an image side, the fourth lens group being configured to travel in the direction of an optical axis upon focusing operation. In the image pickup lens, following conditional expression (1) is satisfied: f/f4<-0.35, where f is a focal length of the entire system, and f4 is a focal length of the fourth lens group.

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Inventors:

SUNAGA TOSHIHIRO

Application Number:

JP2013007310A

Publication Date:

July 28, 2014

Filing Date:

January 18, 2013

Export Citation:

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Assignee:

SONY CORP

International Classes:

G02B13/00; G02B13/18

Attorney, Agent or Firm:

Masanobu Iwata
Hiroto Nakagawa
Nobuo Suzuki
Atsuo Waki

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