Projection copying apparatus and projection screen therefor

US5003343A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Hubert Hackenberg · Munich, DE
• Traugott Liermann · Unterhaching, DE
• Franz Nadler · Neustadt an der Aisch, DE
• Herbert Plaschke · Gernlinden, DE
• Hans-Joachim Schrecke · Grasbrunn, DE

Key dates

• Filing date: Feb 1, 1990
• Grant date: Mar 26, 1991
• Expiry date: Feb 1, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B21/62
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A projection copying apparatus for reproducing microfilmed originals on a light-tightly disposable projection screen and for producing copies of microfilmed originals comprises means for copying of dot originals operating for complete or sectional copying of the originals, and a projection screen including a diffusing disc, an LCD dics arranged on the diffusing disc, the LCD disc being switchable between two conditions so that in one of the conditions it is transparent for observation of the originals and in the other of the conditions it is opaque for copying or searching.