Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

1998-08-06

2000-05-02

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359753, G02B 904

Patent

active

060579714

ABSTRACT:
The invention provides a compact and simple wide-angle lens system composed of a reduced number of lenses and having high productivity, which is well suited for use on digital cameras, while making sure of the space necessary for edge, and middle thicknesses, and constructing the system and, at the same time, having a given back focus and exit pupil position, and good-enough image-forming capability, and which comprises two lens groups or, in order from the object side thereof, a negative lens group GN and a positive lens group GP with an aperture stop D midway between them and a lens located nearest to the object side thereof being defined by a positive lens, said positive lens conforming three conditions in terms of focal length, shape factor, and making sure of sufficient edge thickness.

REFERENCES:
patent: 2594020 (1952-04-01), Hopkins et al.
patent: 3731989 (1973-05-01), Shimizu
patent: 4130349 (1978-12-01), Hyakumura
patent: 4221467 (1980-09-01), Imai
patent: 4493536 (1985-01-01), Kudo
patent: 4991945 (1991-02-01), Estelle
patent: 5233474 (1993-08-01), Hirakawa
patent: 5251073 (1993-10-01), Schauss
patent: 5513046 (1996-04-01), Toyama
patent: 5796528 (1998-08-01), Mihara

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