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US 4,580,257 AGranted
Dual drive system for phono pickup arm
AssigneePioneer Electronic Corporation
InventorsTakashi Kikuchi, Shinya Takahashi, Masao Ono, Toshio Hirano, Atsuo Ikeda, Kunio Abe
Life of this patent
Estimating the term…
Abstract
A dual drive system for an automatic record player of a type in which programmed music selection can be carried out. The drive system includes a mechanical first drive system for mechanically driving the pickup arm and an electromagnetic second drive system for driving the pickup arm using an electromagnetic force. Circuitry is provided for selecting between the two drive systems in accordance with the selected operational mode of the player or the position of the pickup arm.
Claims15
A drive system for a pickup arm, comprising:
- first pickup arm driving means comprising a mechanical movement including a first rotor and gear transmission means for transmitting torque from a drive motor to said first rotor;
- second pickup arm driving means comprising an electromagnetic drive including a magnetic second rotor and a plurality of drive coils for receiving drive current;
- and means for selectively activating one of said first and second driving means such that the movement of said tone arm in a horizontal direction is selectively separately effected by said first driving means and by said second driving means, at respectively different times, in accordance with one of a selected operational mode and a position of said pickup arm.
Dependencies are inferred from the claim text.