| 摘要 |
PROBLEM TO BE SOLVED: To provide an information recorder which properly controls a laser power, records at a constant turning angle velocity onto an optical disk corresponding to CLV(contact linear velocity) system, and is able to search at a high-speed in a record sequence. SOLUTION: On an information recorder, a DVD-R 1 is driven to rotate by a spindle motor 17, etc., with a constant turning angle velocity. A wobbling signal is obtained by a wobbling signal generating part 22 from a push-pull signal based on the reflected light of a light beam emitted by an optical pickup, and is binarized by a binarizing circuit 23, and then, the wobbling frequency is detected by a frequency detecting part 24 and outputted to a CPU 11. Based on this, the CPU calculates the optimal recording power of semiconductor laser 14a corresponding to the linear velocity of the DVD-R 1, and instructs a power control part 16 for a laser driving circuit 15 to drive the semiconductor laser 14a with this optimal recording power. Consequently, it is possible to perform a laser power control accurately following up the variation in the linear velocity of the DVD-R 1 when written, and also to perform a high speed search even in a record sequence. |
