发明授权
- 专利标题: Optical disc drive for controlling laser emission
- 专利标题(中): 用于控制激光发射的光盘驱动器
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申请号: US10524896申请日: 2003-10-06
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公开(公告)号: US07177253B2公开(公告)日: 2007-02-13
- 发明人: Hiromichi Ishibashi , Tetsuya Shihara , Hisashi Senga , Toshio Matsumoto
- 申请人: Hiromichi Ishibashi , Tetsuya Shihara , Hisashi Senga , Toshio Matsumoto
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Akin Gump Strauss Hauer & Feld, LLP
- 优先权: JP2002-302934 20021017
- 国际申请: PCT/JP03/12800 WO 20031006
- 国际公布: WO2004/036564 WO 20040429
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
In an optical disc drive, a laser light source emits a laser beam having an intensity changeable with the amount of drive current supplied. A first photodetector receives the laser beam reflected from an optical disc, thereby generating a readout signal. A second photodetector receives the laser beam, generates an electric signal representing the power of the laser beam received, and outputs the electric signal as a light quantity detection signal. A feedback control loop compares the level of the light quantity detection signal with a predetermined target value and regulates the drive current such that the level of the light quantity detection signal approaches the target value. In reading data from the optical disc, the target value is changed so as to compensate for a variation of the sensitivity of the second photodetector, thereby controlling the power of the laser beam emitted from the laser light source.
公开/授权文献
- US20050254403A1 Optical disc drive 公开/授权日:2005-11-17