Standard lens system having a large aperture ratio

Details Standard lens system having a large aperture ratio Standard lens system having a large aperture ratio

1996-08-23

1998-11-10

Font, Frank G.

Optical: systems and elements

Lens

Multiple component lenses

359784, 359786, 359787, 359788, 359791, G02B 964, G02B 914, G02B 912

Patent

active

058352864

ABSTRACT:
A standard lens system composed, in order from the object side, of a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power: the first lens unit being composed of at least one positive meniscus lens component which has a convex surface on the object side, and at least one doublet which consists of a positive meniscus lens component and a negative lens component; the second lens unit being composed of at least one cemented doublet which consists of a negative lens element and a positive lens element, and a positive lens component; and the third lens unit being composed of at least one positive lens component and a negative lens component or at least one negative lens component.

REFERENCES:
patent: 3802765 (1974-04-01), Vuijk
patent: 4235519 (1980-11-01), Fujibayashi
patent: 4464023 (1984-08-01), Kato et al.
patent: 4786153 (1988-11-01), Ogata
patent: 4807983 (1989-02-01), Matsushita
patent: 4826301 (1989-05-01), Ikemori
patent: 4986643 (1991-01-01), Moriyama
patent: 5007720 (1991-04-01), Hamanishi
patent: 5257135 (1993-10-01), Kohno et al.
patent: 5299065 (1994-03-01), Watanabe
patent: 5592334 (1997-01-01), Oshikiri et al.

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