发明名称 |
OPTICAL DISC DEVICE AND INFORMATION RECORDING/REPRODUCTION METHOD |
摘要 |
<p>An optical disk apparatus including: a light source; an objective lens for converging light emitted from the light source toward an optical disk; a first photodetection device for detecting reflected light from the optical disk and outputting a first signal; a signal processing section for receiving the first signal and generating a signal containing information recorded on the optical disk; a second photodetection device for detecting a portion of the light emitted from the light source and outputting a second signal; a light source driving section for receiving the second signal, and based on the second signal, driving the light source so that output power of the light source equals a target value; and an amplitude fluctuation detection section for detecting an amplitude fluctuation amount of the second signal, and if the amplitude fluctuation amount exceeds a predetermined value, changing driving characteristics of the light source driving section.</p> |
申请公布号 |
EP1626399(A1) |
申请公布日期 |
2006.02.15 |
申请号 |
EP20040733982 |
申请日期 |
2004.05.19 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
KAYAMA, HIROSHI;MOMOO, KAZUO |
分类号 |
G11B7/125;(IPC1-7):G11B7/125;G11B7/005;G11B7/004 |
主分类号 |
G11B7/125 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|