Apparatus for transporting or positioning of a strip-shaped light-sensitive material with reference to a picture window

US4436399A · kind A · utility

Inventors

• Carl Koch · Cincinnati, US
• Karl Gfeller · Langwiesen, CH

Key dates

• Filing date: Aug 27, 1982
• Grant date: Mar 13, 1984
• Expiry date: Aug 27, 2002

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B17/28
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A roll film (25) is guided behind a fixed light-path opening (22) in a housing 20 which limits the largest format of the pictures producible with the housing. Opposite areas of the light-path opening (22) may be covered up by two adjustable mask parts (51, 52) in order to change the picture window left open between the mask parts. Operating elements for the selection of the format of the picture window and its position within the light-path opening (22) are coupled with electro-mechanical transducers for producing electrical theoretical value signals. Electro-mechanical transducers (93, 94) for producing electrical actual-value signals are associated with the mask parts (51, 52). A reversible film travel apparatus (65-78) is connected with an electro-mechanical transducer (95) for producing electrical signals. All signals mentioned are fed to an electronic logical circuit module (130). A corrective film travel is controlled via signal outlets of the logical circuit module (130) for changing of the picture window, which with regard to direction and extent corresponds with the position change of that mask part (52) needed to change the picture window, which mask part (52) defines the…