Title:
ADAPTER LENS
Document Type and Number:
Japanese Patent JP2006349747
Kind Code:
A
Abstract:
To reduce only distortion aberration caused on a picture plane such as a screen in a projection lens for a liquid crystal projector or the like.
The adapter lens is attached to the enlargement side of the projection lens, and the distortion aberration of the projection lens is reduced by the adapter lens without largely changing the focal distance of the projection lens.
Inventors:
NAKAYAMA HIROKI
YAMAZAKI SHINJI
YAMAZAKI SHINJI
Application Number:
JP2005172313A
Publication Date:
December 28, 2006
Filing Date:
June 13, 2005
Export Citation:
Assignee:
CANON KK
International Classes:
G02B13/00; G02B13/18; G02B15/20; G02B27/18
Attorney, Agent or Firm:
Keizo Nishiyama
Yuichi Uchio
Yuichi Uchio