VARIABLE POWER OPTICAL SYSTEM AND IMAGE CAPTURE DEVICE

WIPO Patent Application WO/2012/120875

A1

Provided is a variable power optical system that is small, inexpensive, high-performance, and has a small F-number, and a satisfactory correction of chromatic aberration from the visible region to the near infrared region. The variable power optical system is equipped with, in order from the object side: a positive first lens group (G1); a negative second lens group (G2); an aperture; a positive third lens group (G3); and a positive fourth lens group (G4). During magnification variation, the first lens group (G1), the aperture, and the third lens group (G3) are fixed, the second lens group (G2) and the fourth lens group (G4) move in the direction of the optical axis, and the fourth lens group (G4) has a focus function. The third lens group (G3) has at least one aspherical surface and comprises, in order from the object side: a positive lens (L31); and a double lens formed from a positive lens (L32) and a biconcave-shaped lens (L33). The variable power optical system satisfies conditional expressions pertaining to the focal length of the third lens group (G3), the focal length of the lens (L31), the focal length of the doublet lens of the third lens group (G3), and an Abbe number of the doublet lens.

ONO KAZUNORI (JP)

PCT/JP2012/001519

September 13, 2012

March 06, 2012

Click for automatic bibliography generation  

FUJIFILM CORP (JP)
ONO KAZUNORI (JP)

G02B15/16; G02B13/18

JP2010102096A	2010-05-06
JP2010145759A	2010-07-01
JP2009204942A	2009-09-10
JP2009180897A	2009-08-13
JP2008310222A	2008-12-25
JP2007298831A	2007-11-15
JP2006113111A	2006-04-27
JP2005128186A	2005-05-19
JP2001356268A	2001-12-26
JP2001221948A	2001-08-17
JPH08248318A	1996-09-27

YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)

View/Download PDF      PDF Help

Previous Patent: DETECTION METHOD AND DETECTION DEVICE

Next Patent: IMAGE DECODING METHOD, IMAGE CODING METHOD, IMAGE DECODER, AND IMAGE ENCODER