Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1981-10-20
1984-09-04
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
346137, 369270, 369290, G11B 724, G11B 2314
Patent
active
044701373
ABSTRACT:
In the recording and/or reproducing device according to the present invention, a disc unit (i.e., recording member) is utilized which comprises upper and lower spaced centrally apertured recording portions. Each recording portion is provided with an annular recording layer on its inner surface and an aperture at its center for rotatably mounting on a turntable. Upon rotating the turntable with the disc unit, the recording and reproducing device records information signals on, and reads information signals from, the recording layer on each recording portion by using a light beam. The light beam is positioned to strike only the recording layer on the lower recording portion. When the disc unit is turned on its other side, the previously positioned upper unit is then positioned as the lower unit to receive the light beam. The turntable comprises a perpendicularly orientated centering member which engages the aperture of a recording portion. The centering member centers the disc unit on the turntable. The centering member has a length such that it enters the aperture in the lower recording portion but does not protrude into the aperture in the upper recording portion.
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McElheny Jr. Donald E.
Tokyo Shibaura Denki Kabushiki Kaisha
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