Optical medium recording method and apparatus employing pulse width delay and/or advancement

An optical recording apparatus comprising:

• a rotating mechanism for rotating an optical medium on which information is recorded;
• an optical head having a light source for recording information on said optical medium by producing a light beam;
• a moving mechanism for moving the optical head to a predetermined position on the optical medium;
• recording controlling means for controlling the light source of said optical head in accordance with a recording pulse, said recording pulse having a pulse width and separated from another, preceding recording pulse by a pulse interval, said pulse width and said pulse interval being changed in response to the information to be recorded on said optical medium, such that recording marks are formed on said optical medium during a high-level period of said recorded pulse, said recording controlling means comprising:
• relative pulse width measuring means for subtracting, from the pulse width of a given recording pulse, the width of a pulse interval preceding said given recording pulse, to obtain a first relative difference;
• fall controlling means for effecting a recording compensation by advancing a fall of said gives recording pulse by a lead such that said lead increases with said first relative difference;
• relative pulse interval measuring means for subtracting, from the width of a pulse interval preceding a given recording pulse, the pulse width of a preceding recording pulse that precedes said pulse interval, to obtain a second relative difference;
• and
• rise controlling means for effecting a recording compensation by delaying the rise of said given recording pulse by a delay such that said delay decreases with said second relative difference.

An optical medium recording method for recording information, represented by recording pulses separated from each other by pulse intervals, on an optical recording medium comprising the steps of:

• measuring the pulse width of a recording pulse for the information to be recorded on an optical medium;
• advancing the fall of said recording pulse by a lead such that said lead increases with said measured pulse width;
• measuring the duration of a pulse interval preceding a recording pulse;
• delaying the rise of said recording pulse by a delay such that said delay decreases with said measured pulse interval;
• and
• impinging light on said optical recording medium from an optical head having a light source, in correspondence to a high-level period of said recording pulse having its rise delayed and its fall advanced, and thus recording information by forming recording marks on said optical recording medium.

An optical recording method for recording information, represented by recording pulses separated from each other by pulse intervals, on an optical recording medium, comprising the steps of:

• measuring a pulse width difference by subtracting, from the pulse width of a given recording pulse, the duration of a pulse interval preceding said given recording pulse;
• advancing the fall of said given recording pulse by a lead such that said lead increases with said pulse width difference;
• measuring a pulse interval difference by subtracting, from the duration of a pulse interval that precedes a given recording pulse, the width of a recording pulse preceding said pulse interval;
• delaying the rise of said given recording pulse by a delay such that said delay decreases with said pulse interval difference;
• and
• impinging light on said optical recording medium from an optical head having a light source, in correspondence to a high-level period of said recording pulse having its rise delayed and its fall advanced, and thus recording information by forming recording marks on said optical recording medium.

An optical recording apparatus for recording information on an optical recording medium, comprising:

• a rotating mechanism for rotating an optical medium on which information is recorded;
• an optical head having a light source for recording information on said optical medium by producing a light beam;
• a moving mechanism for moving said optical head to a predetermined position on said optical medium;
• recording controlling means for controlling the light source of said optical head in accordance with a recording pulse, said recording pulse having a pulse width and separated from another recording pulse by a pulse interval, said pulse width and said pulse interval changing in response to the information to be recorded on said optical medium, such that recording marks are formed on said optical medium during a high-level period of said recorded pulse, said recording controlling means comprising:
• fall controlling means supplied with data indicative of the pulse width of a recording pulse for effecting a recording compensation by advancing a fall edge of said recording pulse with a lead that increases with said pulse width;
• and rise controlling means pulled with data indicative of the duration of the pulse interval preceding a recording pulse for effecting a recording compensation by retarding a rise edge of said recording pulse with a delay that decreases with said duration;
• trial recording means for effecting a trial recording of trial pulses on said optical recording medium in advance of the recording of said information, said trial recording means comprising binarizing means for reproducing said trial pulses from said optical recording medium and for producing binary output signals indicative of said trial pulses;
• integrating means for integrating said binary output signals for producing an integrated signal;
• and
• shift evaluation means for evaluating a fall edge shift indicative of a shift of the falling edge of said trial pulses on said optical recording medium, and a rise edge shift indicative of a shift of the rising edge of said trial pulses on said optical recording medium, said shift evaluation means producing a first evaluation signal indicative of said fall edge shift of said trial pulses and a second evaluation signal indicative of said rise edge shift of said trial pulses;
• wherein said recording control means further comprises:
• first multiplying means for evaluating an interpolated fall edge shift indicating the relationship between the fall edge shift and the pulse weight of a recording pulse, by multiplying said first evaluation signal upon a predetermined interpolation function indicative of a relationship between the fall edge shift and the pulse width of a recording pulse on a standard recording medium;
• and
• second multiplying means for evaluating an interpolated fall edge shift indicating the relationship between the fall edge shift and the pulse weight of a recording pulse, by multiplying said second evaluation signal upon a predetermined interpolation function indicative of a relationship between the rise edge shift and the pulse interval of a recording pulse on a standard recording medium;
• said fall controlling means and said rise controlling means conducting said recording compensation based upon said interpolated fall edge shift and said interpolated rise edge shift.