Title:
投写用広角ズームレンズおよび投写型表示装置
Document Type and Number:
Japanese Patent JP5229962
Kind Code:
B2
Abstract:
A wide-angle projection zoom lens includes, in order from the magnification side: a first group that remains stationary during zooming and has a negative refractive power; second to fourth groups that are movable independently from each other during zooming; a fifth group that remains stationary during zooming and has a positive refractive power. The projection zoom lens is configured to be telecentric on the reduction side. The first group includes five lenses having negative, negative, negative, positive, negative refractive powers. During zooming from the wide-angle end to the telephoto end, the first group and the fifth group remain stationary, and the second to fourth groups are movable in a direction of the optical axis so as to narrow a space between the first group and the second group and widen a space between the fourth group and the fifth group.
Inventors:
Kenzo Sado
Application Number:
JP2009088032A
Publication Date:
July 03, 2013
Filing Date:
March 31, 2009
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
G02B15/20; G02B13/18; G03B21/14
Domestic Patent References:
| JP2008309897A | ||||
| JP2001141999A |
Attorney, Agent or Firm:
Yanagita Seiji
Go Sakuma
Go Sakuma