US 2003/0112732 A1 · Light source driving unit and optical storage apparatus

A light source driving unit comprising:

a modulating signal generating section generating a plurality of modulating signals based on driving waveform generating information of a light source;
a current source selecting section selecting one or a plurality of currents output from a plurality of current sources based on the plurality of modulating signals generated by said modulating signal generating section;
a light source driving section generating a current having multi-levels based on the one or plurality of currents selected by said current source selecting section, and supplying the generated current to the light source to drive the light source so that light in multi-levels is generated from the light source;
and
a cancelling section adding a signal error amount which cancels differences in amounts of signal delays generated between said modulating signal generating section and said light source driving section at a stage prior to said current source selecting section.

2 more elements

A light source driving unit comprising:

a driving waveform generating information holding section holding driving waveform generating information based on a driving waveform of a light source;
a modulating signal generating section generating a modulating signal for selecting one of currents output from first and second current sources based on the driving waveform generating information held in said driving waveform generating information holding section;
a current selection signal generating section generating a first selection signal for selecting a multi-level current to be output from the first current source in synchronism with one of rising and falling edges of the modulating signal generated by said modulating signal generating section, and a second selection signal for selecting a multi-level current to be output from the second current source in synchronism with other of rising and falling edges of the modulating signal generated by said modulating signal generating section, based on the driving waveform generating information held in said driving waveform generating information holding section;
a light source driving section supplying the current selected by the modulating signal generated by said modulating signal generating section to drive the light source so that light in multi-levels is generated from the light source;
and
a control section carrying out a control so that the current output from the first current source responsive to the first selection signal is supplied to the light source when the modulating signal generated by said modulating signal generating section has a first logic level, and the current output from the second current source responsive to the second selection signal is supplied to the light source when the modulating signal generated by said modulating signal generating section has a second logic level different from the first logic level.

3 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source,
said light source driving unit comprising:
a driving waveform generating information holding section holding driving waveform generating information based on a driving waveform of the light source;
a current selection signal generating section generating a plurality of selection signals for selecting multi-level currents to be output from a plurality of current sources based on the driving waveform generating information held in said driving waveform generating information holding section;
a modulating signal generating section generating a modulating signal for selecting one of the currents output from the plurality of current sources based on the driving waveform generating information held in said driving waveform generating information holding section;
a light source driving section supplying the current selected by the modulating signal generated by said modulating signal generating section to drive the light source so that light in multi-levels is generated from the light source;
and
a control section carrying out a control so that, during a predetermined time in which an arbitrary one of the plurality of selection signals generated by said current selection signal generating section changes, a current component corresponding to the arbitrary selection signal and supplied to the light source remains unchanged.

7 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source,
said light source driving unit comprising:
a driving waveform generating information holding section holding driving waveform generating information based on a driving waveform of the light source;
a modulating signal generating section generating a modulating signal for selecting one of currents output from first and second current sources based on the driving waveform generating information held in said driving waveform generating information holding section;
a current selection signal generating section generating a first selection signal for selecting a multi-level current to be output from the first current source in synchronism with one of rising and falling edges of the modulating signal generated by said modulating signal generating section, and a second selection signal for selecting a multi-level current to be output from the second current source in synchronism with other of rising and falling edges of the modulating signal generated by said modulating signal generating section, based on the driving waveform generating information held in said driving waveform generating information holding section;
a light source driving section supplying the current selected by the modulating signal generated by said modulating signal generating section to drive the light source so that light in multi-levels is generated from the light source;
and
a control section carrying out a control so that the current output from the first current source responsive to the first selection signal is supplied to the light source when the modulating signal generated by said modulating signal generating section has a first logic level, and the current output from the second current source responsive to the second selection signal is supplied to the light source when the modulating signal generated by said modulating signal generating section has a second logic level different from the first logic level.

7 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source,
said light source driving unit comprising:
a driving waveform generating information holding section holding driving waveform generating information based on a driving waveform of the light source;
a modulating signal generating section generating a plurality of modulating signals for selecting one or a plurality of currents output from a plurality of current sources based on the driving waveform generating information held in said driving waveform generating information holding section;
a light source driving section generating a multi-level current based on the one or plurality of currents selected by the plurality of modulating signals generated by said modulating signal generating section, and supplying the generated current to the light source to drive the light source so that light in multi-levels is generated from the light source;
and
a compensating section carrying out a compensation by subtracting an excess amount or adding a lacking amount of the multi-level current generated by said light source driving section, based on differences among delay times of the plurality of modulating signals generated by said modulating signal generating section and the one or plurality of currents selected by the plurality of modulating signals generated by said modulating signal generating section.

6 more elements

A light source driving unit for driving a light source to emit light at multiple irradiating levels, comprising:

a first state control section controlling a first group of states amounting to a portion of states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset first transition rule, and generating a first modulating data corresponding to a selected state;
a second state control section controlling a second group of states amounting to another portion of the states corresponding to the multiple irradiating levels, by controlling transitions of the states based on the modulating signal, the state transition signal and a preset second transition rule, and generating a second modulating data corresponding to a selected state;
a first current source generating a first current based on the first modulating data;
a second current source generating a second current based on the second modulating data;
a switch selecting one of the first and second currents based on the modulating signal;
and
a current driving section supplying a driving current to the light source, said driving current being a sum of one of the first and second currents selected by said switch and a bias current.

4 more elements

A light source driving unit for driving a light source to emit light at multiple irradiating levels, comprising:

a first state control section controlling a first group of states amounting to a portion of states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset first transition rule, and generating a first modulating data corresponding to a selected state and a first state selection signal;
a second state control section controlling a second group of states amounting to another portion of the states corresponding to the multiple irradiating levels, by controlling transitions of the states based on the modulating signal, the state transition signal and a preset second transition rule, and generating a second modulating data corresponding to a selected state and a second state selection signal;
a first current source outputting, of a plurality of currents generated based on the first modulating data, a first current based on the first state selection signal;
a second current source outputting, of a plurality of currents generated based on the second modulating data, a second current based on the second state selection signal;
a switch selecting one of the first and second currents based on the modulating signal;
and
a current driving section supplying a driving current to the light source, said driving current being a sum of one of the first and second currents selected by said switch and a bias current.

4 more elements

A light source driving unit for driving a light source to emit light at multiple irradiating levels, comprising:

a first state control section controlling a first group of states amounting to a portion of states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset first transition rule, and generating a first modulating data corresponding to a selected state and first adding current data;
a second state control section controlling a second group of states amounting to another portion of the states corresponding to the multiple irradiating levels, by controlling transitions of the states based on the modulating signal, the state transition signal and a preset second transition rule, and generating a second modulating data corresponding to a selected state and second adding current data;
a first current source generating a first current based on the first modulating data;
a second current source generating a second current based on the second modulating data;
a third current source generating a first adding current based on the first adding current data;
a fourth current source generating a second adding current based on the second adding current data;
a switch selecting one of a first current sum of the first current and the first adding current and a second current sum of the second current and the second adding current based on the modulating signal;
and
a current driving section supplying a driving current to the light source, said driving current being a sum of one of the first and second current sums selected by said switch and a bias current.

6 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source to emit light at multiple irradiating levels,
said light source driving unit comprising:
a first state control section controlling a first group of states amounting to a portion of states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset first transition rule, and generating a first modulating data corresponding to a selected state;
a second state control section controlling a second group of states amounting to another portion of the states corresponding to the multiple irradiating levels, by controlling transitions of the states based on the modulating signal, the state transition signal and a preset second transition rule, and generating a second modulating data corresponding to a selected state;
a first current source generating a first current based on the first modulating data;
a second current source generating a second current based on the second modulating data;
a switch selecting one of the first and second currents based on the modulating signal;
a current driving section supplying a driving current to the light source, said driving current being a sum of one of the first and second currents selected by said switch and a bias current;
and
a scale setting section setting an output full scale of each of said first and second current sources, said output full scale being varied between a recording mode and a reproducing mode of the optical storage apparatus.

9 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source to emit light at multiple irradiating levels,
said light source driving unit comprising:
a state control section controlling states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset transition rule, and generating modulating data corresponding to a selected state;
a plurality of current sources generating currents based on the modulating data;
a switch selecting one of the currents generated by said plurality of current sources;
a current driving section supplying a driving current to the light source, said driving current being a sum of current selected by said switch and a bias current;
and
a scale setting section setting an output full scale of each of said plurality of current sources, said output full scale being varied between a recording mode and a reproducing mode of the optical storage apparatus.

7 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source to emit light at multiple irradiating levels,
said light source driving unit comprising:
a first state control section controlling a first group of states amounting to a portion of states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset first transition rule, and generating a first modulating data corresponding to a selected state and a first state selection signal;
a second state control section controlling a second group of states amounting to another portion of the states corresponding to the multiple irradiating levels, by controlling transitions of the states based on the modulating signal, the state transition signal and a preset second transition rule, and generating a second modulating data corresponding to a selected state and a second state selection signal;
a first current source outputting, of a plurality of currents generated based on the first modulating data, a first current based on the first state selection signal;
a second current source outputting, of a plurality of currents generated based on the second modulating data, a second current based on the second state selection signal;
a switch selecting one of the first and second currents based on the modulating signal;
a current driving section supplying a driving current to the light source, said driving current being a sum of one of the first and second currents selected by said switch and a bias current;
and
a scale setting section setting an output full scale of each of said first and second current sources, said output full scale being varied between a recording mode and a reproducing mode of the optical storage apparatus.

9 more elements

An optical storage apparatus comprising:

a light source irradiating light on an information recording medium to record information on and/or reproduce information from the information recording medium;
and
a light source driving unit which drives the light source to emit light at multiple irradiating levels,
said light source driving unit comprising:
a first state control section controlling a first group of states amounting to a portion of states corresponding to the multiple irradiating levels, by controlling transitions of the states based on a modulating signal which indicates a transition timing of the irradiating level of the light source, a state transition signal which instructs a state transition and a preset first transition rule, and generating a first modulating data corresponding to a selected state and first adding current data;
a second state control section controlling a second group of states amounting to another portion of the states corresponding to the multiple irradiating levels, by controlling transitions of the states based on the modulating signal, the state transition signal and a preset second transition rule, and generating a second modulating data corresponding to a selected state and second adding current data;
a first current source generating a first current based on the first modulating data;
a second current source generating a second current based on the second modulating data;
a third current source generating a first adding current based on the first adding current data;
a fourth current source generating a second adding current based on the second adding current data;
a switch selecting one of a first current sum of the first current and the first adding current and a second current sum of the second current and the second adding current based on the modulating signal;
a current driving section supplying a driving current to the light source, said driving current being a sum of one of the first and second current sums selected by said switch and a bias current;
and
a scale setting section setting an output full scale of each of said first through fourth current sources, said output full scale being varied between a recording mode and a reproducing mode of the optical storage apparatus.

11 more elements

An optical storage apparatus which forms recording marks corresponding to a binary signal which is to be recorded on an information recording medium by irradiating light on the information recording medium from a light source which is driven by a plurality of pulse train waveforms which are based on multiple irradiating levels corresponding to the binary signal, said optical storage apparatus comprising:

a driving waveform generating information holding section holding timing information indicating each pulse width of the plurality of pulse train waveforms;
a modulating signal generating section generating a modulating signal indicating a transition timing of the irradiating level based on the timing information held in said driving waveform generating information holding section;
a state transition signal generating section generating a state transition signal instructing a transition of a state corresponding to the irradiating level based on the timing information held in said driving waveform generating information holding section;
a state control section controlling the state transition based on the modulating signal generated by said modulating signal generating section, the state transition signal generated by said state transition signal generating section and a preset transition rule, and generating modulating data corresponding to a selected state;
and
a light source driving section driving the light source based on the modulating signal generated by said modulating signal generating section and the modulating data generated by said state control section.

3 more elements

An optical storage apparatus which forms recording marks corresponding to a binary signal which is to be recorded on an information recording medium by irradiating light on the information recording medium from a light source which is driven by a plurality of pulse train waveforms which are based on multiple irradiating levels corresponding to the binary signal, said optical storage apparatus comprising:

a driving waveform generating information holding section holding a plurality of timing information indicating each pulse width of the plurality of pulse train waveforms;
a timing information selecting section selecting one of the plurality of timing information based on the binary signal;
a modulating signal generating section generating a modulating signal indicating a transition timing of the irradiating level based on the timing information selected by said timing information selecting section;
a state transition signal generating section generating a state transition signal instructing a transition of a state corresponding to the irradiating level based on the timing information selected by said timing information selecting section;
a state control section controlling the state transition based on the modulating signal generated by said modulating signal generating section, the state transition signal generated by said state transition signal generating section and a preset transition rule, and generating modulating data corresponding to a selected state;
and
a light source driving section driving the light source based on the modulating signal generated by said modulating signal generating section and the modulating data generated by said state control section.

4 more elements

An optical storage apparatus which forms recording marks corresponding to a binary signal which is to be recorded on an information recording medium by irradiating light on the information recording medium from a light source which is driven by a plurality of pulse train waveforms which are based on multiple irradiating levels corresponding to the binary signal, said optical storage apparatus comprising:

a driving waveform generating information holding section holding a plurality of driving waveform generating information made up of timing information indicating each pulse width of the plurality of pulse train waveforms and pulse number information indicating a repetition number of the timing information;
an information selecting section selecting one driving waveform generating information based on the binary signal;
a modulating signal generating section generating a modulating signal indicating a transition timing of the irradiating level based on the driving waveform generating information selected by said information selecting section;
a light source driving section controlling transitions of states based on the modulating signal generated by said modulating signal generating section, a state transition signal instructing a transition of a state corresponding to the irradiating level and a preset transition rule, and driving the light source based on a selected state, at least one predetermined state corresponding to a plurality of irradiating levels;
and
an irradiating level selecting section selecting one of the plurality of irradiating levels corresponding to the predetermined state based on irradiating level selecting information, and varying the irradiating level corresponding to the selected state to the selected irradiating level.

3 more elements

An optical storage apparatus which forms recording marks corresponding to a binary signal which is to be recorded on an information recording medium by irradiating light on the information recording medium from a light source which is driven by a plurality of pulse train waveforms which are based on multiple irradiating levels corresponding to the binary signal, said optical storage apparatus comprising:

a driving waveform generating information holding section holding a plurality of driving waveform generating information made up of timing information indicating each pulse width of the plurality of pulse train waveforms and pulse number information indicating a repetition number of the timing information;
an information selecting section selecting one driving waveform generating information based on a recording mark length indicated by the binary signal or a combination of adjacent space lengths before and after the recording mark length;
a modulating signal generating section generating a modulating signal indicating a transition timing of the irradiating level based on the driving waveform generating information selected by said information selecting section;
a light source driving section controlling transitions of states based on the modulating signal generated by said modulating signal generating section, a state transition signal instructing a transition of a state corresponding to the irradiating level and a preset transition rule, and driving the light source based on a selected state, at least one predetermined state corresponding to a plurality of irradiating levels;
and
an irradiating level selecting section selecting one of the plurality of irradiating levels corresponding to the predetermined state based on irradiating level selecting information which is generated depending on the recording mark length or the combination of the adjacent space lengths before and after the recording mark length, and varying the irradiating level corresponding to the selected state to the selected irradiating level.

3 more elements

Light source driving unit and optical storage apparatus

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Light source driving unit and optical storage apparatus

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Abstract

Claims75