Zoom lens system and projection-type display apparatus

Details Zoom lens system and projection-type display apparatus Zoom lens system and projection-type display apparatus

1995-12-05

1997-07-01

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359740, 359649, 348335, G02B 1514, G02B 900, G02B 1316, H04N 907

Patent

active

056444354

ABSTRACT:
A zoom lens system comprising, in order from a large conjugate side a first lens group having a negative refracting power and a second lens group having a positive refracting power. A focal length of the zoom lens system becomes longer, as a gap between the first lens group and the second lens group is reduced. The zoom lens system satisfies following relational expressions (1) to (4),

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4662723 (1987-05-01), Imai
patent: 4775228 (1988-10-01), Ikemori et al.
patent: 5179473 (1993-01-01), Yano et al.
patent: 5319495 (1994-06-01), Yamada
patent: 5329401 (1994-07-01), Sato
patent: 5329402 (1994-07-01), Sato
patent: 5339195 (1994-08-01), Ogata
patent: 5418648 (1995-05-01), Ono

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