Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ZOOM LENS SYSTEM, IMAGE PICKUP DEVICE AND CAMERA
Document Type and Number:
WIPO Patent Application WO/2011/001663
Kind Code:
A1
Abstract:
A zoom lens system, an image pickup device and a camera each of which comprises a plurality of lens groups each consisting of at least one lens element and has, in the order from the object side to the image side, a first lens group having a negative power and consisting of at least two lens elements and a second lens group having a positive power, wherein in a zooming action from the wide-angle terminal to the telephoto terminal during image pickup, the lens groups are individually moved along the optical axis in such a manner that the interval between the first and second lens groups is reduced, thereby changing the power to satisfy conditions: fw/D1 > 7.5 and Z = fT/fw > 4.0 (where fw is the focal length of the whole system for the wide-angle terminal, fT is the focal length of the whole system for the telephoto terminal, and D1 is the center thickness of the object-side-most lens element of the first lens group).

Inventors:
BITO TAKAKAZU
YOGO TAKANORI
Application Number:
PCT/JP2010/004284
Publication Date:
January 06, 2011
Filing Date:
June 29, 2010
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
PANASONIC CORP (JP)
BITO TAKAKAZU
YOGO TAKANORI
International Classes:
G02B15/20; G02B13/18
Foreign References:
JP2009098184A2009-05-07
JP2009037125A2009-02-19
JP2009092740A2009-04-30
JP2008292911A2008-12-04
JP2008233499A2008-10-02
JP2007316280A2007-12-06
JP2007140359A2007-06-07
JP2005321744A2005-11-17
JP2005352182A2005-12-22
JP2008298899A2008-12-11
JP2008176231A2008-07-31
JP2010091948A2010-04-22
Attorney, Agent or Firm:
OGASAWARA, Shiro (JP)
Shiro Ogasawara (JP)
Download PDF: