Zoom lens system for use in microfilm projection apparatus

Details Zoom lens system for use in microfilm projection apparatus Zoom lens system for use in microfilm projection apparatus

1988-03-16

1989-12-19

Sugarman, Scott J.

350286, G02B 1514, G02B 504

Patent

active

048878910

ABSTRACT:
A zoom lens system for use in a microfilm projecting apparatus, the system consisting of a positive lens group at the enlargement side, a negative lens group at the reduction side and an aperture stop disposed in the first lens group. The positive lens group includes, from the enlargement side, a positive lens unit having at least one positive lens element, a biconcave lens element, a positive lens element and a positive compound lens unit composed of a negative lens element and a positive lens element cemented together. The negative lens group includes, from the enlargement side, a positive meniscus lens element having a concave surface on the enlargement side, a biconcave lens element and a positive lens element. The positive lens group with the aperture stop and the negative lens group are moved along the optical axis in an operation of zooming.

REFERENCES:
patent: 3360325 (1964-05-01), Gustafson
patent: 4232942 (1980-11-01), Ikemori

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