IMAGING OPTICAL SYSTEM AND ELECTRONIC IMAGE TAKING DEVICE HAVING SAME

WIPO Patent Application WO/2014/087855

A1

The present invention comprises, in order from the object side: a first lens group (G1) having a negative refractive power, a second lens group (G2) having a positive refractive power, a third lens group (G3) having a negative refractive power, and a fourth lens group (G4) having a positive refractive power; a gap between neighboring lens groups changing during power variation; the first lens group (G1) comprising a negative lens and a positive lens, or a first negative lens, a second negative lens, and a positive lens; the second lens group (G2) comprising a first lens component and a second lens component; the first lens component comprising a positive single lens, or a cemented lens in which a positive lens and a negative lens are joined in this order; the second lens component having a cemented lens; the third lens group (G3) comprising one or two lenses overall and having furthest toward the object side a lens in which the curvature of an image-side surface thereof is greater than the curvature of an object-side surface thereof; and the fourth lens group (g4) comprising one positive lens component.

ICHIKAWA KEISUKE (JP)
MIHARA SHINICHI (JP)

PCT/JP2013/081527

June 12, 2014

November 22, 2013

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OLYMPUS CORP (JP)

G02B15/20; G02B13/18

JP2005156828A	2005-06-16
JP2005055496A	2005-03-03
JP2006208889A	2006-08-10
JP2012181350A	2012-09-20
JP2008304777A	2008-12-18
JP2012133230A	2012-07-12
JP2012133228A	2012-07-12

SAITO Keisuke et al. (JP)
Keisuke Saito (JP)

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