Turntable device having rotary recording medium size changeover

Details Turntable device having rotary recording medium size changeover Turntable device having rotary recording medium size changeover

1981-06-03

1985-01-08

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

G11B 362

Patent

active

044930720

ABSTRACT:
A turntable device having rotary recording medium size changeover capability in a rotary recording medium reproducing apparatus, comprising a turntable driven in rotation by a rotation driving source, a turntable sheet carried on the turntable for carrying and supporting a rotary recording medium thereon thereby to unitarily rotate therewith, a spindle for the turntable, an air suction pump, and a communicating structure providing communication between the air suction pump and enclosed spaces formed between the turntable sheet and the rotary recording medium. The turntable has a first group of suction grooves of predetermined patterns. The turntable sheet has a second group of suction grooves of predetermined patterns. The turntable sheet is changed over according to the size of the rotary recording medium adhered onto the upper surface of the turntable sheet, upon a rotational setting operation in which the turntable sheet is rotated by a predetermined angle to vary the communication between the first and second groups of the suction grooves of the turntable and the turntable sheet.

REFERENCES:
patent: 3608909 (1971-09-01), Rabinow

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