Automatic record size detector

Details Automatic record size detector Automatic record size detector

1979-10-04

1981-11-24

Haroian, Harry N.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369239, G11B 360

Patent

active

043028330

ABSTRACT:
Three sets of light receivers are arranged on the turn table of a phonograph record player. The light radiated on the turn table is received and introduced to light receiving elements for conversion into a pulse signal. When a 30-cm record is placed on the turn table, the three sets of light receivers are all converted and fail to produce a pluse signal. When a 25-cm record is placed on the turn table, the first set of light receivers are exposed; while when a 17-cm record is placed on the turn table, the first and second sets of light receivers are exposed. The number of pulses produced from the light receiving elements is counted, thus determining the size of the record placed on the turn table.

REFERENCES:
patent: 3966330 (1976-06-01), Ridler et al.
patent: 4134593 (1979-01-01), Hiramatzu

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