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US 3,939,302 AGranted
Method and apparatus for recording and/or reproducing a video signal on a photographic record disc
AssigneeSony Corporation
InventorNobutoshi Kihara
Life of this patent
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AssigneeSony Corporation
InventorNobutoshi Kihara
Estimating the term…
Composite television signals are recorded in a spiral track or in a series of concentric circular tracks on a record disc. Line sequential signals are optically recorded in the radial direction on a record disc with one horizontal line interval of the composite television signals corresponding to the width of the record track, and with the successive line signals being arranged in the circumferential direction of the track. Pulse-time modulated video and audio signals are recorded as a series of depressions all having the same width and the same depth, and with the varying length between the adjacent depressions corresponding to the information signal. A video signal reproducing head is provided adjacent to the optical record disc for optically reproducing video signals from the tracks on the disc which is, during reproduction of the signals, rotated at an extremely low speed so as to facilitate the reliable tracking of the signal reproducing head in respect to the recorded tracks.
A method of recording television signals having line and field intervals in substantially circular record tracks on a rotatable record disc, comprising the steps of:
The method according to claim 20;
Apparatus for recording signals having line and field intervals, comprising a record disc, signal recording means arranged adjacent to said disc and receiving said signals, said signal recording means including pulse modulating means for pulse modulating a carrier with said received signals, pilot signal generating means for generating a pilot signal for use during subsequent playback of the recorded signals to demodulate the pulse modulated signals, means generating a beam of radiant energy modulated by said pulse modulating means and said pilot signal generating means and acting on said record disc for recording corresponding signals on said record disc, means for effecting the relatively slow translational movement of said record disc and signal recording means relative to each other so that said corresponding signals are recorded in substantially circular record tracks on the record disc, and means for effecting the relatively rapid repeated scanning by said beam of radiant energy in the radial direction of said record disc across the width of one of said record tracks so as to record at least one line interval of the pulse modulated signals and a pilot signal in at least preceding or following relation to said pulse modulated signals during each said scanning across said width of the record track.
Apparatus for reproducing signals having line and field intervals and which are recorded as pulse modulated signals on a record disc with successive line intervals of the recorded signals being recorded together with a pilot signal in at least preceding or following relation thereto in the radial direction of the record disc across the width of a substantially circular record track at respective locations along the circumference of said track;
Dependencies are inferred from the claim text.