Imaging lens

Details Imaging lens Imaging lens

1996-05-23

1997-12-16

Nelms, David C.

Optical: systems and elements

Lens

Multiple component lenses

359757, 359793, G02B 900, G02B 904, G02B 962

Patent

active

056992025

ABSTRACT:
A first lens group having a four-lens configuration of positive, negative, negative, and positive lenses and a second lens group comprising at least two lenses are disposed successively 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, thereby yielding an imaging lens with a high brightness and a wide field angle which can favorably correct various kinds of aberration. From the object side, the first lens group, in which a positive first lens L1, a negative second lens L2, a negative third lens L3, and a positive fourth lens L4 are successively arranged, and the second lens group comprising three lenses L5, L6, and L7 are disposed. The difference in dispersion between the materials forming the lenses L1 to L7 is made smaller than 0.0055, while the lenses are configured so as to satisfy the following conditional expressions:
-0.2<F/F1<1.0, -0.1<F/F2<1.4, 0.8<F/fa<2.0, 0.5<.vertline.F/fb.vertline.<1.5, 1.6<.vertline.F/fc.vertline.<3.0, 1.0<F/fd<2.5

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patent: 5204782 (1993-04-01), Mercado et al.
patent: 5210646 (1993-05-01), Mercado et al.

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