Title:
ZOOM LENS FOR PROJECTION, AND PROJECTION-TYPE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/057909
Kind Code:
A1
Abstract:
In order to provide a zoom lens for projection which exhibits excellent correction of field curvature due to focusing, even if the angle of view is widened, essentially, a zoom lens for projection is configured from: a first lens group (G1) which has negative refractive power, is arranged furthest toward the magnification side, and is fixed during a change in magnification; a second lens group (G2) which has negative refractive power, is arranged further toward the reduction side than the first lens group (G1), and is fixed during a change in magnification; a final lens group (G6) which has positive refractive power, is arranged furthest toward the reduction side, and is fixed during a change in magnification; and three lens groups (G3, G4, G5) which are arranged between the final lens group (G6) and the second lens group (G2), and which move during a change in magnification. Furthermore, the reduction side is a telecentric structure, and focusing is carried out by moving only the second lens group (G2).
More Like This:
| JP3369598 | [Title of Invention] Variable Lens |
| JP2023181855 | ZOOM LENS AND IMAGING APPARATUS |
| JP2008304765 | ZOOM LENS AND IMAGE PROJECTION DEVICE USING THE SAME |
Inventors:
AMANO MASARU (JP)
Application Number:
PCT/JP2012/006555
Publication Date:
April 25, 2013
Filing Date:
October 12, 2012
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JPS486813B | ||||
| JPS4737550A | ||||
| JP2002357771A | 2002-12-13 | |||
| JP2011013657A | 2011-01-20 | |||
| JP2013003371A | 2013-01-07 | |||
| JP2010282159A | 2010-12-16 | |||
| JP2010122326A | 2010-06-03 |
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
Seiji Yanagida (JP)
Download PDF:
Claims: