Apparatus and method for copying photographic masters at variable magnifications

US5151733A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Gunter Findeis · Sauerlach, DE
• Friedrich Jacob · Munich, DE
• Eberhard Schulz · Maintal, DE

Key dates

• Filing date: Sep 13, 1991
• Grant date: Sep 29, 1992
• Expiry date: Sep 13, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B27/462
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Light is passed through a negative located in a primary optical path and towards a band of copy material disposed in the path. A reflector is movable into the primary path so as to deflect the light into a secondary optical path. A mat, transparent plate is situated in the secondary path. The plate is situated in a plane which is a conjugate of the plane of the copy material with reference to the reflector when the latter is in the primary path. A sharp image of the negative is formed on the plate. Light passing through the plate is deflected into a tertiary optical path by a second reflector. The light entering the tertiary path is sensed by a video camera which then causes the image on the plate to be reproduced on a monitor for evaluation prior to copying.