Light source drive, optical information recording apparatus, and optical information recording method
AssigneeRicoh Company, Ltd.
InventorsNaruhiro Masui, Hidetoshi Ema
Life of this patent
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Abstract
A light source drive which modulates a light source so as to cause the same to emit a light, includes: a superposition current generation part which generates a superposition current approximately corresponding to a charging/discharging current needed for a capacitance occurring in parallel to the light source for a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of a drive current for the light source; and an addition/subtraction part which adds to or subtracts from the drive current the superposition current generated by the superposition current generation part.
Claims2
A light source drive which modulates a light source so as to cause the same to emit a light, comprising:
- a superposition current generation part which generates a superposition current approximately corresponding to a charging/discharging current needed for a capacitance occurring in parallel to said light source for a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of a drive current of said light source;
- an addition/subtraction part which adds to or subtracts from the drive current the superposition current generated by said superposition current generation part;
- and
- an output impedance control part which changes an output impedance value of a drive current output part which provides the drive current to said light source, for a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of the drive current.
A light source drive which modulates a light source so as to cause the same to emit a light, comprising:
- a superposition signal generation part which generates a superposition signal which indicates a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of a drive current of said light source;
- a superposition current generation part which generates a superposition current approximately corresponding to a charging/discharging current needed for a capacitance occurring in parallel to said light source based on the superposition signal generated by said superposition signal generation part;
- an addition/subtraction part which adds to or subtracts from the drive current the superposition current generated by said superposition current generation part;
- and
- an output impedance control part which changes an output impedance value of a drive current output part which provides the drive current to said light source, for a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of the drive current.
Dependencies are inferred from the claim text.