Title:
PROJECTOR ZOOM LENS AND PROJECTOR DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/114755
Kind Code:
A1
Abstract:
[Problem] To provide a projection zoom lens, wherein the lens is made compact and wide angle with six lens groups, and different types of aberration can be corrected effectively over the entire range of variation. [Solution] From the enlarging side, in order, a first lens group (G1) having a negative refractive power, a second lens group (G2) having a positive refractive power, a third lens group (G3) having a positive refractive power, a fourth lens group (G4) having a negative refractive power, a fifth lens group having a positive refractive power (G5), a sixth lens group (G6) having a positive refractive power are provided, and the reducing side is telecentric. When varying the power of the lens, the first lens group (G1) and the sixth lens group (G6) are fixed, with the second lens group (G2) to the fifth lens group (G5) being movable. The fifth lens group (G5) comprises a plurality of lenses, and a double-convex lens is positioned furthest towards the enlarging side. Moreover, the conditional expressions (1): (R51a + R51b)/(R51a - R51b) ≦ 0, and the conditional expression (2): 25.0 < vd51 < 45.0 are satisfied
Inventors:
AMANO MASARU (JP)
Application Number:
PCT/JP2012/001238
Publication Date:
August 30, 2012
Filing Date:
February 23, 2012
Export Citation:
Assignee:
FUJIFILM CORP (JP)
AMANO MASARU (JP)
AMANO MASARU (JP)
International Classes:
G02B15/20; G02B13/18; G02F1/13; G02F1/1335; G03B21/14
Foreign References:
| JP2007241184A | 2007-09-20 | |||
| JP2007206420A | 2007-08-16 | |||
| JP2005266103A | 2005-09-29 | |||
| JP2006234893A | 2006-09-07 |
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
Seiji Yanagida (JP)
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