| 摘要 |
PURPOSE:To obtain the optical disk device which is increased in storage capacity by increasing the bit density without causing any mutual interference of the output waveform of a playback signal even when bit intervals are narrowed down by allowing the waveform of write laser light to have a specific standard energy value at a leading and a trailing edge part. CONSTITUTION:A write signal 22 forms a bit 23 by irradiating an optical disk with laser light 22a having higher energy than readout laser light 22c having low energy. The waveform of the write signal 22 is not rectangular, but held at the 1st energy write signal 22 is not rectangular, but held at the 1st energy standard (22a) for a short time and then decreases monotonously to an energy value of a standard 22b in the middle between the 1st standard and the 2nd standard (22c). Therefore, the bit 23 has a semicircular part as the left half and a part thinner than a semicircle as the right half. Consequently, the output waveform of the playback signal has no mutual interference even when the bit density is increased, so the storage capacity can be increased. |
