US 6,982,943 B2
Method and apparatus for controlling power during recording of a visible image in optical storage medium
Morito Morishima, Fukuroi (Japan)
Assigned to Yamaha Corporation, Mamamatsu (Japan)
Filed on Jun. 27, 2003, as Appl. No. 10/609,285.
Claims priority of application No. 2002-188168 (JP), filed on Jun. 27, 2002.
Prior Publication US 2004/0001411 A1, Jan. 01, 2004
Int. Cl. G11B 7/00 (2006.01)
U.S. Cl. 369—116 16 Claims
OG exemplary drawing
 
1. An optical disc recording apparatus, comprising:
an optical pickup that irradiates a laser light onto a label surface of an optical disc;
a servo device that performs focus servo for maintaining an approximately fixed distance between the optical disc and the optical pickup and outputs a signal showing whether the focus servo fails or not;
a position moving device that moves an irradiating position of the optical pickup on the optical disc;
a laser power controller that controls a laser power of the laser light in accordance with input data to be recorded;
a detector that detects whether the focus servo fails or not in accordance with the signal output by the servo device;
an obtaining device that obtains a distance and an angle as a benchmark position, the distance being from an optical disc center to an irradiating position of the laser light, and the angle being between a baseline from the optical disc center to an outer periphery and a line from the optical disc center to the irradiating position, when a failure of the focus servo is detected by the detecting device; and
a controller that controls the laser power controller to pause the control of the laser power in accordance with the data to be recorded and thereafter controls the position moving device and the laser power controller to restart the control of the laser power in accordance with the data to be recorded from the benchmark position as a restarting position.