Information recording device, information playback device, information recording medium and method for multi-values recording optical disc

1. An information recording device, comprising:

a recording pulse generation unit configured to generate a recording pulse based on multi-value modulation data; and

a data recording unit configured to:

record a mark on a recording medium based on the recording pulse generated by the recording pulse generation unit; and

execute a data recording processing to set sizes of all of marks to be recorded on the recording medium to be a size equal to or smaller than a spot size of a beam spot at a half level of a maximum value of a two-dimensional light intensity distribution of the beam spot.

2. The information recording device according to claim 1 , wherein

the data recording unit is further configured to execute the data recording processing to form a plurality of recording regions in a plurality of modes, and

the plurality of recording regions in the plurality of modes has different densities of recording marks on the recording medium based on a value of the multi-value modulation data.

3. The information recording device according to claim 1 , wherein

the data recording unit is further configured to execute the data recording processing to form a plurality of recording regions in at least three or more types of different modes on the recording medium based on a value of the multi-value modulation data, and

the at least three or more types of different modes include:

a mark non-recording region,

a first mark recording region with a first density, and

a second mark recording region with a second density, wherein

the first density is lower than the second density.

4. The information recording device according to claim 1 , wherein the data recording unit is further configured to execute the data recording processing to form a plurality of recording regions in at least three or more types of different modes on the recording medium based on a value of the multi-value modulation data, and

the at least three or more types of different modes include:

a first mark recording region with a first density,

a second mark recording region with a second density, and

a third mark recording region with a third density, wherein

the first density is lower than the second density, and

the second density is lower than the third density.

5. The information recording device according to claim 1 , wherein the recording pulse generation unit is further configured to:

generate a plurality of pulse signals having different densities based on a value of the multi-value modulation data; and

output the plurality of pulse signals to the data recording unit.

6. The information recording device according to claim 1 , wherein

the recording pulse generation unit is further configured to generate the recording pulse based on one of pulse frequency modulation (PFM) signals, pulse density modulation (PDM) signals, or pulse number modulation (PNM) signals having different densities, wherein the different densities are based on a value of the multi-value modulation data, and

the data recording unit is further configured to execute the data recording processing to form the mark on the recording medium based on the recording pulse.

7. The information recording device according to claim 1 , wherein

the recording pulse generation unit includes a delta sigma modulator,

the delta sigma modulator includes:

a difference calculation unit;

an accumulation adder; and

a requantization unit,

the recording pulse generation unit is further configured to generate a plurality of recording pulses in a plurality of modes having different pulse densities based on a value of the multi-value modulation data, and

the data recording unit is further configured to execute the data recording processing to form the mark on the recording medium based on the plurality of recording pulses.

8. The information recording device according to claim 1 , wherein the data recording unit includes:

a recording correction unit configured to:

correct a width and a timing of the recording pulse generated by the recording pulse generation unit; and

generate a recording signal based on the corrected width and the timing of the recording pulse; and

an optical pickup unit (OPU) comprising:

a laser diode (LD);

a front monitor photodetector (FPD) configured to output a light intensity detection signal of an output of the LD; and

a laser diode driver (LDD) configured to:

drive the LD based on the recording signal generated by the recording correction unit;

control an output light intensity of the LD based on the light intensity detection signal; and

perform the mark recording based on a brush tip recording.

9. An information recording medium, comprising:

a plurality of marks recorded based on multi-value modulation data,

wherein all the recorded marks have a size equal to or smaller than a spot size of a beam spot at a half level of a maximum value of a two-dimensional light intensity distribution of the beam spot.

10. An information playback device, comprising:

a data readout unit configured to:

execute readout of a mark recorded in an information recording medium, wherein the mark has a size equal to or smaller than a spot size of a beam spot of an optical pickup unit at a half level of a maximum value of a two-dimensional light intensity distribution of the beam spot; and

acquire multi-value modulation data; and

a demodulation unit configured to:

receive an input of the multi-value modulation data acquired by the data readout unit; and

generate binary data.

11. An information recording method, comprising:

generating, by a recording pulse generation unit of an information recording device, a recording pulse based on multi-value modulation data;

setting, by a data recording unit of the information recording device, sizes of all of marks to be recorded on a recording medium to be a size equal to or smaller than a spot size of a beam spot at a half level of a maximum value of a two-dimensional light intensity distribution of the beam spot; and

recording, by the data recording unit, a mark on the recording medium based on the generated recording pulse.

12. A non-transitory computer-readable medium having stored thereon computer-executable instructions, that when executed by a processor of an information recording device, cause the processor to execute operations, the operations comprising:

generating a recording pulse based on multi-value modulation data;

setting sizes of all of marks to be recorded on a recording medium to be a size equal to or smaller than a spot size of a beam spot at a half level of a maximum value of a two-dimensional light intensity distribution of the beam spot; and

recording a mark on the recording medium based on the generated recording pulse.

13. An information recording device, comprising:

a recording pulse generation unit configured to generate a recording pulse based on multi-value modulation data; and

a data recording unit configured to:

record a mark on a recording medium based on the recording pulse generated by the recording pulse generation unit;

set sizes of all of marks to be recorded on the recording medium to be a size equal to or smaller than a spot size of a beam spot; and

form a plurality of recording regions in a plurality of modes having different densities of recording marks on the recording medium based on a value of the multi-value modulation data.