Electronic scanning of super-8 films for reproduction on a T.V. viewing unit

US4330793A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Otto Stemme · Munich, DE
• Eduard Wagensonner · Aschheim, DE
• Wolfgang Ruf · Friedberg, DE

Key dates

• Filing date: Jul 11, 1979
• Grant date: May 18, 1982
• Expiry date: Jul 11, 1999

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/11
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Super-8 motion-picture film is transported non-intermittently at constant speed, and its image is projected into an image plane in which is located a single row of photodiodes which extends transverse to the film transport direction. The photodiodes of the single photodiode-row are successively responsive to red, blue and green wavelengths. A bucket-brigade circuit or CCD including the photodiode-row furthermore includes a shift register which receives the photodiode signals in parallel, is then read out serially, with its output signal then time-division demultiplexed to obtain separate red, blue and green signals; or else three shift registers are used, each receiving signals only from those photodiodes responsive to a respective one of the three component colors. Whereas the photodiode-row is responsible for horizontal scanning, vertical scanning is achieved in part due to film transport per se and in part due to a tilting-mirror deflector which deflects the image projected onto the photodiode-row. The tilting-mirror deflector is a galvanometric moving-coil mechanism, and is energized by a sawtooth waveform to effect forwards scanning and abrupt vertical-direction flyback or til…