发明名称 |
Method of controlling laser diode in optical disk player and circuit therefor |
摘要 |
Electric power consumed by a laser diode when an optical disk or magneto-optical disk is played back is reduced. A laser diode control circuit ( 6 ) causes the laser diode to emit continuously rather than intermittently, even if a PCK signal is supplied to the laser diode control circuit ( 6 ), when an optical display player or magneto-optical disk drive does not yet stabilize and is being pulled into a phase-locked state. When the focus is locked, the player is in a phase-locked state, and the operation is stable, a mode-switching circuit ( 9 ) included in the laser diode control circuit ( 6 ) switches the mode of operation from continuous operation to intermittent operation according to an FLOCK signal. The frequency of the PCK is multiplied by a frequency multiplier circuit ( 7 ), and the pulse width is adjusted by a pulse width-adjusting circuit ( 8 ). A laser diode driver circuit ( 10 ) produces intermittent current of this adjusted pulse width. The laser diode is started to emit intermittently.
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申请公布号 |
US6944113(B2) |
申请公布日期 |
2005.09.13 |
申请号 |
US20010871186 |
申请日期 |
2001.05.31 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TSUJIKAWA TOSHIAKI;SAITOH MASATAKA |
分类号 |
G11B7/005;G11B7/085;G11B7/125;G11B11/105;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/005 |
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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