Projecting zoom lens system and projector apparatus

Details Projecting zoom lens system and projector apparatus Projecting zoom lens system and projector apparatus

1998-05-29

2000-06-13

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359680, G02B 1514

Patent

active

060756535

ABSTRACT:
A projecting zoom lens system whose incidence side is telecentric of this invention is formed by the first to fourth lens groups arranged sequentially from the screen side and having negative, positive, negative and positive refractive powers, respectively. The employment of the negative refractive power lens group on the screen side allows a wider angle and a smaller lens aperture of the first lens group, thereby realizing a compact lens with a larger aperture as a whole. Furthermore, if a positive lens is employed on the screen side in the first lens group of the projecting zoom lens, the balance of refractive power can be improved.

REFERENCES:
patent: 5739958 (1998-04-01), Abe
patent: 5805350 (1998-09-01), Yamamoto

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