Wide-angle lens for film-combined type cameras

Details Wide-angle lens for film-combined type cameras Wide-angle lens for film-combined type cameras

1993-03-18

1996-04-16

Phan, James

Optical: systems and elements

Lens

Including a nonspherical surface

359739, 359793, G02B 1318

Patent

active

055088481

ABSTRACT:
The present invention provides a wide-angle lens for film-combined type cameras, comprising a first lens element having a negative refractive power and a second lens element having a positive refractive power which have more than one aspherical surface.

REFERENCES:
patent: 2730925 (1956-01-01), Kavangh
patent: 2889745 (1959-06-01), Hayes et al.
patent: 4789230 (1988-12-01), Ohta
patent: 4865435 (1989-09-01), Cho
patent: 4953926 (1990-09-01), Morimoto

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