IMAGING OPTICAL SYSTEM, IMAGING LENS DEVICE, AND DIGITAL APPARATUS

WIPO Patent Application WO/2007/145194

A1

An imaging optical system with a "positive-negative-positive-positive-positive" five-group zoom structure having high optical performance despite its compactness. The imaging optical system has, in order from the object side, a first lens group having positive optical power, fixed in magnification varying operation, and including a reflection member for bending the optical axis at a right angle; a second lens group having negative optical power and movable in the optical axis direction; a third lens group having positive optical power; a fourth lens group having positive optical power and movable in the optical axis direction; and a fifth lens group having positive optical power and movable in the optical axis direction. The relationship between the focal length of the imaging device, the distance on the optical axis, and the focusing distance of the fifth lens group is determined so that the ratio of the amounts of variation in magnification between the fourth lens group and the fifth lens group is optimized.

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YAMADA KEIKO (JP)
KONNO KENJI (JP)

PCT/JP2007/061783

December 21, 2007

June 12, 2007

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KONICA MINOLTA OPTO INC (JP)
YAMADA KEIKO (JP)
KONNO KENJI (JP)

G02B15/20; G02B13/18

JP2005266173A	2005-09-29
JP2005338143A	2005-12-08
JP2006145651A	2006-06-08

KOTANI, Etsuji et al. (2-2 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, JP)

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