Patent · US Expired

Microfilm sensing device with a projection lamp and cold-light mirror

US4564276A · kind A · utility

7Cited by

3References

15Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Wilfried Hofmann · Munich, DE
Herbert Lusch · Taufkirchen, DE
Walter Rauffer · Munich, DE
Eberhard Zieran · Grünwald, DE
Jurgen Sylla · Oberhaching, DE

Key dates

Filing date	Feb 15, 1984
Grant date	Jan 14, 1986
Priority date	—
Expiry date	Feb 15, 2004

Classification

Technology area (CPC G)Physics
CPC primaryG03B21/11
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An apparatus for sensing microfilms is provided in addition to visible light with a projection lamp for radiating infrared rays which pass through a cold-light mirror to a platform on which a microfilm is disposed. The apparatus is further provided with a projection lens positioned above the microfilm platform. The path of rays is directed from the microfilm platform through the projection lens and then is projected onto an image screen or other sensing surface, for example CCD-device. For adjusting the apparatus for various light spectrum combinations the apparatus is provided with at least one infrared component-reflecting mirror which is displaceable or pivotable to and from the path of illumination rays radiated from the projection lamp.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.