Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

1997-02-14

1998-08-18

Epps, Georgia Y.

Optical: systems and elements

Lens

Reverse telephoto

359749, 359793, G02B 1304

Patent

active

057965285

ABSTRACT:
The invention proves 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 sufficient 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 to three conditions in terms of focal length, shape factor, and ensuring sufficient edge thickness.

REFERENCES:
patent: 2594020 (1952-04-01), Hopkins et al.
patent: 4130349 (1978-12-01), Hyakumura
patent: 4221467 (1980-09-01), Imai
patent: 4493536 (1985-01-01), Kudo
patent: 5233474 (1993-08-01), Hirakawa
patent: 5251073 (1993-10-01), Schauss
patent: 5513046 (1996-04-01), Toyama

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