Microfilm reading and reverse enlarging apparatus

US4754306A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Josef Auer · Achstetten, DE
• Hubert Hackenberg · Munich, DE
• Adolf Koopmann
• Jurgen Sylla · Oberhaching, DE

Key dates

• Filing date: Jun 22, 1987
• Grant date: Jun 28, 1988
• Expiry date: Jun 22, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B21/118
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A microfilm reading and reverse enlarging apparatus with a copying beam for a gap illumination comprises a copy carrier movable with a constant speed, drive device for moving the copy carrier, a film platform for a film and adjustable relative to an illuminating beam, transporting device for reciprocating the film platform synchronously with the movement of the copy carrier, control device for controlling the transporting device, a potentiometer adjustable by the transporting device synchronously with the movement of the platform so as to produce respective values in response to the movement of the platform during a copying process of successive microimages, and storing and comparing device arranged to store preselected values and to receive the values of the potentiometer to compare them with the preselected values, the storing and comparing device being connected with the control device so that the transporting device and the drive device for the copy carrier during reaching by the values of the potentiometer the preselected values are turned on and/or turned off.