G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
Dispositif de lecture et/ou écriture d'une bande auxiliaire d'un film cinématographique, notamment d'une bande de son, et tête d'éclairage pour ce dispositif