Patent ID: 7633844

Claim:
An optical information recording apparatus for forming a pit and a space on an optical recording medium by emitting a recording laser beam comprising at least a high output zone and a low output zone and for concurrently detecting the pit and space with a playback laser beam, the apparatus comprising: a beam splitter configured to divide a laser beam emitted by a laser diode into at least a recording laser beam and a playback laser beam; a retrieving circuit configured to retrieve a portion of a playback signal obtained in the high output zone of the recording laser beam from the playback signal obtained by emitting the playback laser beam, wherein the portion of the playback signal is retrieved concurrently with the emission of the recording laser beam; an averaging circuit configured to detect an average value of the retrieved playback signal; a peak value detecting circuit configured to detect a peak value of the retrieved playback signal; and an adjusting circuit configured to adjust the power of the recording laser beam based at least in part on the average value and the peak value.