Wide angle imaging lens

Details Wide angle imaging lens Wide angle imaging lens

1996-06-21

1998-05-19

Nelms, David C.

Optical: systems and elements

Lens

Microscope objective

359754, 359784, G02B 2102, G02B 912

Patent

active

057543453

ABSTRACT:
A first lens group composed of at least three sheets of lenses, a second lens group composed of positive, negative, and positive lenses, and a third lens group composed of at least two sheets of lenses are successively disposed from the object side, while these lenses are made of at least two kinds of glass materials having a difference in dispersion therebetween smaller than 0.0055 and satisfy predetermined conditional expressions, thereby yielding a wide angle imaging lens with a high brightness and a wide field angle which can favorably correct various kinds of aberration, in particular, such as chromatic aberration and image surface. From the object side, the first lens group comprising, successively from the object side, a negative first lens L.sub.1, a positive second lens L.sub.2, and a negative third lens L.sub.3 ; the second lens group comprising, successively from the object side, a positive fourth lens L.sub.4, a negative fifth lens L.sub.5, and a positive sixth lens L.sub.6 ; and the third lens group comprising, successively from the object side, a positive seventh lens L.sub.7 and a negative eighth lens L.sub.8 are successively disposed, while the difference in dispersion between the materials forming the lenses is made smaller than 0.0055, and the lenses are configured so as to satisfy the following conditional expressions:

REFERENCES:
patent: 3907401 (1975-09-01), Liu
patent: 4702569 (1987-10-01), Mercado et al.
patent: 4761064 (1988-08-01), Mercado et al.
patent: 4792219 (1988-12-01), Mihara
patent: 5204782 (1993-04-01), Mercado et al.
patent: 5272564 (1993-12-01), Suzuki et al.
patent: 5555479 (1996-09-01), Nakagiri

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