Optical data recording and playback system

An optical recording data reproduction system for reproducing recorded data of an optical magnetic tape wherein main data is optically recorded on main track surface in the form of helical scan, control data for controlling reading of the main data that is optically recorded on the subtrack placed under said main track, comprising:

• a shift clock input terminal;
• first pick-up means fixedly mounted close to the surface of said optical magnetic tape, for sensing and storing optically magnetic recorded data on said main track, and for generating said stored data by way of shift transmission according to charge transmission clock and the shift clock of said input terminal;
• second pick-up means fixedly mounted close to lower flat surface os said optical magnetic tape, for sensing control data recorded in the subtrack;
• control clock generating means, which are triggered by a sensed control data output of said second pick-up means, for applying the charge transmission clock to the first pick-up means;
• and
• means for amplifying the output signal of said first pick-up means up to a given level, and for demodulating said amplified signal to produce a digital signal.

An optical data recording system for recording image signals, which are converted into optical signals, on an optical magnetic tape, comprising:

• first laser generating means for generating laser beams according to picture data of the image signals;
• synchronous separation means for separating vertical synchronizing signals from said image signals;
• means for converting said separated vertical synchronizing signals into parabolic waveform voltages;
• means for generating focus control signals in response to said parabolic waveform voltages;
• beam collecting means having a collecting lens for focusing said laser beams on said optical magnetic tape, and an element that vibrates in response to said focus control signals for vibrating together with said collecting lens for controlling the focusing of said laser beams on said optical magnetic tape by said collecting lens;
• and
• second laser generating means for converting said vertical synchronizing signals to a laser beam for recording on a subtrack of said optical magnetic tape as control data.

A reproduction system for reproducing recorded data of an optical magnetic tape wherein main data is optically recorded on a main track of said tape in the form of helical scan, and for reproducing control data optically recorded on a subtrack adjacent said main track, wherein said control data controls reading of the main data, said system comprising:

• a shift clock input terminal for receiving a shift clock;
• first pick-up means, fixedly mounted close to and above the main track of said optical magnetic tape, for sensing and storing said main data recorded on said main track, and for outputting said stored data by way of shift transmissions according to a charge transmission clock and the shift clock of said shift clock input terminal;
• second pick-up means, fixedly mounted close to and above said subtrack of said optical magnetic tape, for sensing said control data recorded on the subtrack;
• control clock generating means, triggered by the sensed control data of said second pick-up means, for applying the charge transmission clock to the first pick-up means;
• and
• means for amplifying an output signal of said first pick-up means up to a given level, and for demodulating said amplified signal to produce a digital signal.

An optical data recording method for recording image signals, which are converted into optical signals, on an optical magnetic tape, comprising the steps of:

• generating laser beams according to picture data of the image signals;
• separating vertical synchronizing signals from said image signals;
• converting said separated vertical synchronizing signals into parabolic waveform voltages;
• generating focus control signals in response to said parabolic waveform voltages;
• focusing said laser beams on said optical magnetic tape, by utilizing beam collecting means having a collecting lens and an element that vibrates in response to said focus control signals to vibrate said collecting lens to control the focusing of said laser beams on said optical magnetic tape by said collecting lens;
• and
• converting said vertical synchronizing signals to a laser beam for recording on a subtrack of said optical magnetic tape as control data.

A method for reproducing recorded data of an optical magnetic tape wherein main data is optically recorded on a main track of said tape in the form of helical scan, and for reproducing control data optically recorded on a subtrack adjacent said main track, wherein said control data controls reading of the main data, said method comprising the steps of:

• receiving a shift clock at a shift clock input terminal;
• sensing and storing said main data recorded on said main track by utilizing first pick-up means, fixedly mounted close to and above the main track of said optical magnetic tape;
• outputting said stored data by way of shift transmissions according to a charge transmission clock and the shift clock of said shift clock input terminal;
• sensing said control data recorded on the subtrack by utilizing second pick-up means, fixedly mounted close to and above said subtrack of said optical magnetic tape;
• generating the charge transmission clock in response to the sensed control data of said second pick-up means;
• applying the charge transmission clock to the first pick-up means;
• amplifying an output signal of said first pick-up means up to a given level;
• and
• demodulating said amplified signal to produce a digital signal.