发明名称 |
Laser power monitor device, optical pickup including the same, and optical recording and/or reproducing apparatus including the same |
摘要 |
In order to improve the frequency characteristic of a laser power monitor device and the precision of laser power control when low-speed recording is performed, there is provided a laser power monitor device for an optical recording and/or reproducing apparatus, the laser power monitor device including a photo diode unit to receive part of a light emitted from a laser diode and output a current proportional to optical power, and a monitor circuit to receive the current output from the photo diode unit, convert the received current into a voltage, and outputs the voltage to an automatic laser power control circuit, and the photo diode unit includes a plurality of photo diodes connected to the monitor circuit to supply current to the monitor circuit. The laser power monitor device further includes a switch unit, wherein the switch unit is located between the photo diode unit and the monitor circuit to receive a signal on a current recording speed and switch so that the number of photo diodes supplying current to the monitor circuit is reduced as the recording speed is increased.
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申请公布号 |
US2005002303(A1) |
申请公布日期 |
2005.01.06 |
申请号 |
US20040751647 |
申请日期 |
2004.01.06 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
KWON SUNG-DU;LEE JUN-HYUK;SEONG PYONG-YONG;BANG HYUN-CHEAL;LEE JONG-KOOG;CHO YONG-JUN |
分类号 |
G11B7/00;G11B7/125;H01S5/06;(IPC1-7):G11B7/00 |
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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