VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM

WIPO Patent Application WO/2014/112176

A1

The present invention provides a variable magnification optical system, an optical device, and a method for manufacturing a variable magnification optical system. The variable magnification optical system includes a positive first lens group (G1), a negative second lens group (G2), and a positive third lens group (G3) sequentially from an object side. The variable magnification optical system also includes a V lens group (GV) and an F lens group (GF). The V lens group (GV) changes the interval between the first lens group (G1) and the second lens group (G2) and the interval between the second lens group (G2 and the third lens group (G3) when the magnification is varied from a wide angle end state to a telephoto end state, has a negative refracting power, and moves so as to include components in a direction perpendicular to an optical axis. The F lens group (GV) has a positive refracting power, and moves along the optical axis when the focus is moved from an infinite distance object to a short distance object. When the V lens group (GV) is disposed closer to an object than the F lens group (GF), a variable magnification optical system having a high variable magnification ratio, a small size and high optical performance is provided.

SASHIMA TOMOYUKI (JP)
OBAMA AKIHIKO (JP)

PCT/JP2013/079242

July 24, 2014

October 29, 2013

Click for automatic bibliography generation  

NIKON CORP (JP)

G02B15/20; G02B13/18; G03B5/00

JP2010191334A	2010-09-02
JP2011033868A	2011-02-17
JP2010044190A	2010-02-25
JP2010032700A	2010-02-12
JPH10111456A	1998-04-28
JPH01241513A	1989-09-26
JP2012083601A	2012-04-26
JP2012047814A	2012-03-08

INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)

View/Download PDF      PDF Help

Previous Patent: CHARGE RATE ESTIMATION DEVICE AND CHARGE RATE ESTIMATION METHOD

Next Patent: MULTI-DISK TRANSMISSION