Title:
IMAGE PICKUP OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2009/136580
Kind Code:
A1
Abstract:
An image pickup optical system which is provided in order from the object side with a first lens group (G1) with positive refractive power, a stop (S), a second lens group (G2) with positive refractive power, a third lens group (G3) with negative refractive power is characterized in that the first lens group (G1) has a cemented lens comprised of a first lens (L1) and a second lens (L2), the second lens group (G2) has a third lens (L3), the third lens group (G3) has a fourth lens (L4), an object side surface of the third lens (L3) is a concave surface on the axis and at the off-axis with respect to the object side, and an image side surface of the third lens (L3) is a convex surface on the axis with respect to the object side and an aspherical surface having one or more inflection points at the off-axis.
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Inventors:
UCHIDA YOSHIHIRO (JP)
Application Number:
PCT/JP2009/058436
Publication Date:
November 12, 2009
Filing Date:
April 22, 2009
Export Citation:
Assignee:
OLYMPUS CORP (JP)
UCHIDA YOSHIHIRO (JP)
UCHIDA YOSHIHIRO (JP)
International Classes:
G02B13/00; G02B13/18
Foreign References:
| JP2008090041A | 2008-04-17 | |||
| JP2007212877A | 2007-08-23 | |||
| JP2006301230A | 2006-11-02 | |||
| JP2005265950A | 2005-09-29 |
Attorney, Agent or Firm:
KOYAMA, Takashi et al. (Ueno Suzuki Bldg. 7th Floor 16-3, Ueno 3-chome, Taito-k, Tokyo 05, JP)
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