Device for illuminating an auxiliary track of a motion picture f

Details Device for illuminating an auxiliary track of a motion picture f Device for illuminating an auxiliary track of a motion picture f

1988-06-20

1990-07-17

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369125, 352 11, 352 26, 352 27, G11B 700

Patent

active

049425668

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.

REFERENCES:
patent: 4149781 (1979-04-01), Everett, Jr.
patent: 4603099 (1986-07-01), Drexler
patent: 4651313 (1987-03-01), Guez

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