Projecting zoom lens and projection display device

Details Projecting zoom lens and projection display device Projecting zoom lens and projection display device

2007-09-25

2009-06-02

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S689000, C359S691000

Reexamination Certificate

active

07542213

ABSTRACT:
A power varying operation is performed by moving four lens groups out of six lens groups. A reduction side of a zoom lens is constructed as a substantially telecentric system. An aspheric lens is arranged in a pupil neighboring position where an effective aperture becomes smallest. Conditional Expressions (1) to (5) are satisfied.in-line-formulae description="In-line Formulae" end="lead"?1.2≦bf/fw  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|fa/fw|≦4.5  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?φa/φim≦1.0  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|ffaw/fw|≦1.5  (4)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?E≦300×10−7(/° C.)  (5)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 2003/0030917 (2003-02-01), Omura
patent: 2005/0200967 (2005-09-01), Yamasaki et al.
patent: 2007/0070513 (2007-03-01), Yamashita et al.
patent: 2007/0109663 (2007-05-01), Sano et al.
patent: 2001-311872 (2001-11-01), None
patent: 2005-156963 (2005-06-01), None
patent: 2005-266103 (2005-09-01), None

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