Image pickup optical system and image pickup apparatus using the same

Patent metadata

Field	Value
Publication number	US-8964095-B2
Application number	US-201313791173-A
Country	US
Kind code	B2
Filing date	Mar 8, 2013
Priority date	Jun 22, 2010
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

The image pickup optical system comprises:
an aperture is placed on the most object side, the image pickup optical system comprises, in order from the object side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, and the following conditional expression is satisfied:

−1.49<( r 6+ r 7)/( r 6− r 7)<1.24  (1)
where r 6 is the paraxial radius of curvature of an object side surface of the third lens, and r 7 is the paraxial radius of curvature of an image plane side surface of the third lens.

First claim

What is claimed is:

1. An image pickup optical system wherein
an aperture is placed on the most object side,
the image pickup optical system comprises, in order from the object side:
a first lens having a positive refractive power;
a second lens having a negative refractive power;
a third lens having a positive refractive power;
a fourth lens having a positive refractive power; and
a fifth lens having a negative refractive power, and
wherein:
an image-side surface…

Assignees

• Olympus Corp

Inventors

• Ohtsu Takuya

Classifications

• G02B13/0045 Primary

  Physics · mapped topic

• H04N5/2254

  Electricity · mapped topic