发明名称 |
Laser power controller and optical disk device |
摘要 |
A power control device for controlling a power of a light source of an optical beam directed to an optical medium. The power control device includes a reflected light detector for detecting reflected light from the optical medium when irradiated by an optical beam which is following a track; an arithmetic unit for calculating from the reflected light a transmissivity of light transmitted from a disk surface to a recording layer or an amount of directed light on the recording layer of the medium; and power control means for controlling the power of the light source for emission based on a calculation result produced by the arithmetic unit.
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申请公布号 |
USRE39952(E1) |
申请公布日期 |
2007.12.25 |
申请号 |
US19990223909 |
申请日期 |
1999.08.20 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
INOKUCHI CHIKASHI;FURUMIYA SHIGERU;MIYABATA YOSHIYUKI;HISAKADO YUJI;MIYAZAKI ATSUSHI;AKAGI TOSHIYA |
分类号 |
G11B7/00;G11B7/0045;G11B7/005;G11B7/0055;G11B7/006;G11B7/007;G11B7/125 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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