Zoom lens

Details Zoom lens Zoom lens

1997-11-12

1999-11-23

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, 359687, G02B 1514

Patent

active

059910925

ABSTRACT:
In a master lens section having an imaging effect, a luminous divergent lens portion having a negative refracting power is disposed on the object side of an aperture stop, whereby Petzval sum is restrained from greatly becoming negative, thus keeping image quality in the periphery of the image surface from deteriorating. In a master lens group M, a concave lens L.sub.18 a having a negative refracting power is disposed on the object side of an aperture stop 2, thus decreasing the distance between a zoom lens second group Z2 and the concave lens L.sub.18 at the wide-angle end, so that the incident luminous flux moderately diverges at an early stage, thus restraining Petzval sum from becoming greatly negative.

REFERENCES:
patent: 5583700 (1996-12-01), Usui et al.
patent: 5745300 (1998-04-01), Usui et al.
patent: 5760967 (1998-06-01), Terasawa et al.
patent: 5808809 (1998-09-01), Yahangi

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