| 摘要 |
PURPOSE: To prevent the increase of the transient output power of an oscillation circuit, and to set a luminous output at a set value automatically by providing a means in which the rise time when high-frequcncy currents are superposed to laser driving currents is made simultaneous with or later than the response time of an automatic output control loop. CONSTITUTION:An optical disk 2 for an optical disk device 1 is turned and driven by a spindle motor arranged in the vertical direction, an optical head 3 is disposed oppositely to one surface of the disk 2, and the disk 2 is irradiated with light beams. A laser diode 5 is housed in the head 3, and the diode 5 is controlled by output currents from an APC circuit 7 for controlling power. The diode 5 is supplied with high-frequency currents from an oscillation circuit 8 for high-frequency superposition. A pin photodiode for monitor is sealed into the diode 5, and luminous a output in case of the operation of the circuit 8 is set automatically to set-value power by the currents of the diode. |
