Title:
IMAGE FORMING OPTICAL SYSTEM AND ELECTRONIC IMAGING DEVICE HAVING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/032512
Kind Code:
A1
Abstract:
An image forming optical system includes a positive lens group, a negative lens group,
and a diaphragm. The negative lens group is arranged at the image side than the
diaphragm. The negative lens group has a cemented lens obtained by cementing a
plurality of lenses. In an orthogonal coordinate system having a horizontal axis
Nd and a vertical axis νd, when a straight line expressed by Nd = α ×
νd + β (wherein α = -0.017) is set, the Nd and νd of at
least one of the lenses constituting the cemented lens are contained in both of
the regions: one region defined by a straight line as the lower limit and a straight line
as the upper limit of the range of the condition expression [1] given below; and
the other region defined by the condition expressions [2] and [3] given below. 1.45
<β < 2.15 ... [1] 1.30 < Nd < 2.20 ... [2] 3 <νd <
12 ... [3] wherein Nd represents the refractivity and νd represents the
Abbe number.
Inventors:
MIHARA SHINICHI (JP)
ADACHI KANATO (JP)
ICHIKAWA KEISUKE (JP)
IGA YASUNOBU (JP)
MATSUMOTO KOJI (JP)
MURAYAMA KAZUAKI (JP)
MATSUO KEIGO (JP)
NAGATA HIDEKI (JP)
ADACHI KANATO (JP)
ICHIKAWA KEISUKE (JP)
IGA YASUNOBU (JP)
MATSUMOTO KOJI (JP)
MURAYAMA KAZUAKI (JP)
MATSUO KEIGO (JP)
NAGATA HIDEKI (JP)
Application Number:
PCT/JP2006/318450
Publication Date:
March 22, 2007
Filing Date:
September 11, 2006
Export Citation:
Assignee:
OLYMPUS CORP (JP)
MIHARA SHINICHI (JP)
ADACHI KANATO (JP)
ICHIKAWA KEISUKE (JP)
IGA YASUNOBU (JP)
MATSUMOTO KOJI (JP)
MURAYAMA KAZUAKI (JP)
MATSUO KEIGO (JP)
NAGATA HIDEKI (JP)
MIHARA SHINICHI (JP)
ADACHI KANATO (JP)
ICHIKAWA KEISUKE (JP)
IGA YASUNOBU (JP)
MATSUMOTO KOJI (JP)
MURAYAMA KAZUAKI (JP)
MATSUO KEIGO (JP)
NAGATA HIDEKI (JP)
International Classes:
G02B15/20; G02B13/18; H04N5/225; H04N101/00
Foreign References:
JP2001033701A | 2001-02-09 | |||
JPH08320434A | 1996-12-03 | |||
JP2000121821A | 2000-04-28 | |||
JPH10307257A | 1998-11-17 | |||
JP2004069808A | 2004-03-04 | |||
JP2004264786A | 2004-09-24 | |||
JP2005181499A | 2005-07-07 |
Attorney, Agent or Firm:
SAITO, Keisuke (8-5 Iidabashi 2-chom, Chiyoda-ku Tokyo 72, JP)
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