Turntable for record disc

Details Turntable for record disc Turntable for record disc

1976-06-17

1977-12-27

Phillips, Charles E.

Undertaking

G11B 360

Patent

active

040651355

ABSTRACT:
A grooved vinyl record disc is securely held in a turntable which includes an annular platen having a rigid, very flat upper surface. Air is evacuated from the underside of the disc, although the platen is impervious to air, by means of annular grooves adjacent the inner and outer edges of the platen and connected through passageways defined in the turntable structure, and through a rotary fluid coupling to communicate with a vacuum source. Resilient seals are provided for isolating the grooves on the underside of the record from ambient air, and these seals support the record disc so it can be flattened as it is drawn downwardly onto the platen by the application of vacuum.

REFERENCES:
patent: 1062579 (1913-05-01), Aylsworth
patent: 3608909 (1971-09-01), Rabinow

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