by photoelectric sensing

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 > by sensing features present on, or derived from, record carrier or container > by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape > by photoelectric sensing

Classification Context

Section:

PHYSICS

Class:

INFORMATION STORAGE

Subclass:

INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER