Wide-angle lens

Details Wide-angle lens Wide-angle lens

1998-07-13

2000-01-18

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359740, G02B 912, G02B 900

Patent

active

060162295

ABSTRACT:
A wide-angle lens and a superwide-angle lens suitable to electronic imaging cameras (e.g., video cameras and digital still cameras) is provided. In particular, a wide-angle lens having a long back focus and with an angle of view of about 75 degrees is provided.
This wide-angle lens comprises a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a diaphragm, and a third lens group G3 having a positive refractive power in this order from the object. The first lens group G1 has a positive meniscus lens and at least one negative meniscus lens. The third lens group G3 includes a cemented lens having a convex surface facing the object side, said convex surface being positioned closest to the object in this lens group. This wide-angle lens satisfies the conditions

REFERENCES:
patent: 3862794 (1975-01-01), Fujii
patent: 3981563 (1976-09-01), Nakamura
patent: 4009944 (1977-03-01), Takahashi
patent: 4210388 (1980-07-01), Ikeda
patent: 5557473 (1996-09-01), Sugiyama

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