US 4,752,921 A · Record player with means for capturing recording and scanning angle

Abstract

A record player with a scanner for record disks is provided, where the vertical recording track angle .alpha. is to be placed within predetermined limits, but where, in general, the value of .alpha. is not known. The scanner comprises a transducer which generates useful signals and which is provided with elastically supported and therefore movable scanning elements. According to the invention, means are provided for determining the difference .alpha.-.beta. of the recording track angle .alpha. and of the tracking track angle .beta.. The angle difference determining means generate a voltage which depends on the longitudinal motion of the scanning elements moved during the useful modulation and which is displayed and/or employed for correcting the track angle. A record player with a tracking sound pick-up arm for the tracking of record disks is provided. Means for tracking a groove on a side of a record disk are disposed elastically supported and thus movable on the sound pick-up arm. A first transducer is disposed on the tone arm for generating useful signals. A second transducer is provided for transducing of the voltage generated by detection of a longitudinal motion of the scanner.

Claims20

Dependent claims

A record player with a tracking tone arm for the tracking of record disks comprising

a tone arm;
means for tracking a groove on a side of a record disk disposed elastically supported and thus movable on said tone arm where the predetermined vertical recorded track angles .alpha. is within predetermined values and without any requirement that the real values of the vertical recorded track angle .alpha. be known;
a first transducer disposed on the tone arm for generating useful signals and sensing the tracking motion of said means for tracking;
electronic means connected to said first transducer and receiving said useful signals from which said electronic means uses for determining the difference .alpha.-.beta. between the predetermined recorded track angle .alpha. and actual tracking track angle .beta. depending on the longitudinal motion of said means for tracking.

1 more element

A record player with a tracking tone arm for the tracking of record disks comprising

a radially or tangentially tracking tone arm for tracking of tone record disks, where the predetermined vertical recorded track angle .alpha. is to be maintained within predetermined limits, but where the real value of the angle is in general unknown, and where the tone arm is provided with a tracking system and with a transducer, which includes elastically supported and therefore movable tracking parts;
means for determining the difference .alpha.-.beta. of said recorded track angle .alpha. and of pick-up track angle .beta. based upon the output from said transducer and generates a voltage depending on the longitudinal motion of said tracking parts moving under the useful signal modulation and which said voltage is displayed at a display means and/or where a track angle correction is provided to the tone arm via means for correcting the pick-up track angle .beta..

A method for tracking of sound signals on a record disk with a radially or tangentially sensing tone arm comprising

generating a signal voltage which depends on the longitudinal motion of pick-up elements moved during useful modulation,
determining the difference .alpha.-.beta. of recorded track angle .alpha. and scanning track angle .beta., where the predetermined vertical recorded track angle .alpha. is to be maintained according to a recording specification within predetermined limits, where however the absolute value of .alpha. is in general unknown based upon said generated signal voltage generating a difference .alpha.-.beta. signal with electronic means connected to the pick-up elements;
and employing said signal difference .alpha.-.beta. to enable a correction of the angle.

Dependencies are inferred from the claim text.

Record player with means for capturing recording and scanning angle

Life of this patent

Record player with means for capturing recording and scanning angle

Life of this patent

Abstract

Claims20