Wide angle zoom lens

Details Wide angle zoom lens Wide angle zoom lens

1987-10-07

1989-03-14

Corbin, John K.

G02B 1500, G02B 962

Patent

active

048120219

ABSTRACT:
A wide angle, finite conjugate lens is optimized for use in photocopying applications. Two moveable groups of lenses are movable towards and away from each other and a central aperture. An outer lens group pair is moveable with respect to a moveable inner lens group. The lens groups are moved during a zoom magnification change so that the spaces between the inner and outer lens groups are changed to adjust lens focal length while the space between the inner lens group and a central aperture stop is adjusted to compensate for astigmatism and field curvature variation.

REFERENCES:
patent: 3728010 (1973-04-01), Mikami
patent: 3865470 (1975-02-01), McCrabie et al.
patent: 3912374 (1975-10-01), Liu
patent: 4061419 (1977-12-01), Price et al.
patent: 4406522 (1983-09-01), Conrad
patent: 4650295 (1987-03-01), Terasawa

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