Device for illuminating an auxiliary track of a motion picture film
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United States of America Patent
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-
Jul 17, 1990
Grant Date -
N/A
app pub date -
Jun 20, 1988
filing date -
Jun 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A laser diode (4) emits a beam which is reflected by a plane mirror (12) and by a spherical focusing mirror (2) in order to form a beam (40) which is focused on a read window which is a segment of a read line (6). Said line extends transversely relative to a film (16) running over a drum (20) which rotates about an axis (22). The window occupies the width of the soundtrack on the film. The light passing through said soundtrack is received by a photo cell (34) which provides the sound signal. The invention is particularly applicable to sound motion pictures.
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