Image forming lens

Details Image forming lens Image forming lens

1997-07-21

1999-08-03

Ben, Loha

Optical: systems and elements

Lens

Multiple component lenses

359753, 359763, G02B 960

Patent

active

059332867

ABSTRACT:
An image-forming lens made of five lens elements having refractive power, from the object side, of negative, negative, positive, positive, and negative. The distance between the image side of the surfaces of second and third lens elements is made greater than or equal to 3.4 f, and less than or equal to 7.5 f, where f is the focal length of the image-forming lens, so as to minimize spherical aberration, coma, and astigmatism. The image-forming lens thus formed is a retro-focus lens having a half-picture angle of about 80.degree. and an F# of about 1.8.

REFERENCES:
patent: 3277784 (1966-10-01), Hudson
patent: 4525038 (1985-06-01), Muller
patent: 5153779 (1992-10-01), Ohashi
patent: 5321551 (1994-06-01), Choi

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