Image-forming lens having four lens elements

Details Image-forming lens having four lens elements Image-forming lens having four lens elements

1997-07-21

2000-03-28

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359753, G02B 958, G02B 1304

Patent

active

060439416

ABSTRACT:
An image-forming lens having four lens elements of refractive power, in order from the object side, of: negative, positive, positive, and negative. By making the distance from image-side surface of the first element to the image-side surface of the second lens element to be greater than or equal to 0.3 f and less than or equal to 1.5 f, where f is the focal length of the image-forming lens, an image-forming lens having an F# of approximately 2.8 and a picture angle of about 60 degrees is obtained. A diaphragm may be positioned such that the distance along the optical axis from the diaphragm to the object side of the fourth lens is less than or equal to the focal length of the image-forming lens.

REFERENCES:
patent: 3958864 (1976-05-01), Glatzel
patent: 4310222 (1982-01-01), Ikemori
patent: 4674844 (1987-06-01), Nishioka et al.
patent: 4863250 (1989-09-01), Ishizuka
patent: 5483380 (1996-01-01), Nozawa
patent: 5559638 (1996-09-01), Aoki et al.
patent: 5754345 (1998-05-01), Yamamoto

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