Record player
AssigneeSony Corporation
InventorShuichi Kimura
Life of this patent
Estimating the term…
Abstract
A record player is described having a turntable which is rotated by a pulsed motor energized from a motor drive circuit. The motor driving circuit includes a negative feedback servo loop which includes means for detecting vibration of the arm. Means is further provided for generating an output in response to the vibration of said tone arm. A high-pass filter is provided having a cut-off frequency which is the same or lower than the resonance frequency of the tone arm. The motor is controlled by an output of the servo loop in proportion to an accelerated velocity of the tone arm when said tone arm is vibrating at less than the cut-off frequency.
Claims10
A record player, comprising:
- an arm having a predetermined resonance frequency, a turntable adapted to carry a disk, a motor connected for driving said arm in a horizontal direction with respect to said disc carried on said turntable, a motor driving circuit means connected to said motor and including a negative feedback servo loop, said servo having a detector means for detecting vibration of said arm and for generating an output frequency in response to said vibration of said arm, said servo loop including a high pass filter having a cut-off frequency which is the same or lower than said resonance frequency, the motor being controlled by an output of said motor driving circuit means in proportion to an accelerated velocity of said arm when said arm is vibrated at less than said cut-off frequency.
A record player, comprising:
- an arm having a predetermined resonance frequency, a turntable adapted to carry a disk, a motor connected for moving said arm in a horizontal direction with respect to said disk carried on said turntable, a motor driving circuit means connected to said motor including a negative feedback servo loop, said servo loop having a detector means for detecting movement of said arm and for generating an output frequency in response to said movement, said servo loop including a high-pass filter having a cut-off frequency which is substantially no higher and preferably lower than said resonance frequency, the motor being controlled by an output of said motor driving circuit means in proporation to an accelerated velocity of said arm when said arm is moved at less than said cut-off frequency.
Dependencies are inferred from the claim text.