System for automatically charging and discharging X-ray film sheets into and from cassettes and a cassette for use in the system

US4791282A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Manfred Schmidt · Krefeld, DE
• Herbert Gebele · Sauerlach, DE

Key dates

• Filing date: Sep 11, 1986
• Grant date: Dec 13, 1988
• Expiry date: Sep 11, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B42/045
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An X-ray film cassette has on its top a triangular bar code field readable by a bar code reader of an automatic film sheet charging and discharging apparatus. The bar code field is in the form of an isosceles right triangle whose hypothenuse faces a reference corner and whose legs extend parallel to edges of the cassettes. The bars of the code extend parallel to the hypothenuse. An optical axis of the bar code reader, when the cassette is in its end position in the apparatus, intersects a vertex area formed by the legs of the triangle. This arrangement guarantees that its bar codes on cassettes of small format, even if misaligned in the feeding direction, are reliably read by the reader.