Masking or switching periodically, e.g. of rotating heads

Full Title

Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function > Control of operating function, e.g. switching from recording to reproducing > Masking of heads; Selecting or switching of heads between operative and inoperative functions; Masking of beams, e.g. of light beams > Masking or switching periodically, e.g. of rotating heads

Classification Context

Section:

PHYSICS

Class:

INFORMATION STORAGE

Subclass:

INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER