Optical recording device, optical reproducing device, and optical memory medium

An optical reproducing device for reproducing an optical memory medium in which recorded are a power control pattern for controlling a reproducing power of a light beam and a phase adjusting pattern for adjusting a phase of a reproducing clock to be used upon reproduction of the power control pattern, said device comprising:

• phase adjusting means for adjusting the phase of the reproducing clock according to the phase adjusting pattern;
• A/D converting means for, at the timing of the output of said phase adjusting means, carrying out A/D conversion of a reproducing signal of the power control pattern;
• amplitude detecting means for, from an output of said A/D converting means, detecting an amplitude value of the reproducing signal of the power control pattern;
• and
• power control means for controlling a reproducing power according to the amplitude detected by said amplitude detecting means.

An optical reproducing device for reproducing an optical memory medium in which recorded are a power control pattern for controlling a reproducing power of a light beam, a phase adjusting pattern for adjusting a phase of a reproducing clock to be used upon reproduction of the power control pattern, and a synchronous pattern that is provided immediately before the power control pattern and that is different from both the phase adjusting pattern and the power control pattern, said device comprising:

• phase adjusting means for adjusting the phase of the reproducing clock according to the phase adjusting pattern;
• synchronization detecting means for detecting the synchronous pattern;
• A/D converting means for, at the timing of the output of said phase adjusting means, carrying out A/D conversion of a reproducing signal of the power control pattern;
• and
• amplitude detecting means for starting to detect an amplitude value of the reproducing signal of the power control pattern from the output of said A/D converting means, according to the detection of the synchronous pattern by said synchronization detecting means.