Title:
投写用ズームレンズおよび投写型表示装置
Document Type and Number:
Japanese Patent JP5766889
Kind Code:
B2
Abstract:
A zoom lens for projection consists of a negative first lens group, which is fixed during magnification change, a middle group, which includes plural lens groups that move during magnification change, and a positive last lens group, which is fixed during magnification change, in this order from a magnification side. A reduction side is non-telecentric. Both of a lens group closest to the magnification side and a lens group closest to the reduction side in the middle group have positive refractive power, and move from the reduction side toward the magnification side during magnification change from a wide-angle end to a telephoto end. The last lens group includes at least two positive lenses and at least two negative lenses. A positive lens is arranged closest to the reduction side in the last lens group. A predetermined conditional expression about a focal length of the last lens group is satisfied.
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Inventors:
Akiko Nagahara
Application Number:
JP2014546849A
Publication Date:
August 19, 2015
Filing Date:
October 31, 2013
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
G02B13/16; G02B13/18; G02B15/167; G02B15/20; G03B21/14
Domestic Patent References:
| JP2011123351A | ||||
| JP2001124989A | ||||
| JP200420765A | ||||
| JP2003255226A |
Attorney, Agent or Firm:
Yanagita Seiji
Go Sakuma
Go Sakuma