Title:
投写用変倍光学系および投写型表示装置
Document Type and Number:
Japanese Patent JP5687392
Kind Code:
B2
Abstract:
A variable magnification optical system for projection consists of a negative lens group and a positive lens group in this order from a magnification side. A distance on an optical axis between the negative lens group and the positive lens group changes during magnification change, and an entire system substantially consists of six lenses. The negative lens group consists of a first lens including an aspheric surface and a second lens that is a negative single lens in this order from the magnification side.
Inventors:
永利 由紀子
Application Number:
JP2014518254A
Publication Date:
March 18, 2015
Filing Date:
May 10, 2013
Export Citation:
Assignee:
富士フイルム株式会社
International Classes:
G02B15/16; G02B15/20
Domestic Patent References:
| JP2004085979A | 2004-03-18 | |||
| JPH08234100A | 1996-09-13 | |||
| JP2009047722A | 2009-03-05 | |||
| JPH01210914A | 1989-08-24 | |||
| JP2003057542A | 2003-02-26 |
Attorney, Agent or Firm:
Seiji Yanagida
Sakuma 剛
Sakuma 剛