发明授权
US07636286B2 Front photo detector having no gain selection switch, optical pick-up including the front photo detector, and optical recording and/or playing apparatus including the front photo detector
失效
没有增益选择开关的前光检测器，包括前光检测器的光学拾取器和包括前光检测器的光记录和/或播放装置
- 专利标题： Front photo detector having no gain selection switch, optical pick-up including the front photo detector, and optical recording and/or playing apparatus including the front photo detector
- 专利标题（中）： 没有增益选择开关的前光检测器，包括前光检测器的光学拾取器和包括前光检测器的光记录和/或播放装置
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申请号： US10792917申请日： 2004-03-05
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公开(公告)号： US07636286B2公开(公告)日： 2009-12-22
- 发明人: Hong-kyu Lee , Hee-dong Kim , Pyong-yong Seong
- 申请人： Hong-kyu Lee , Hee-dong Kim , Pyong-yong Seong
- 申请人地址： KR Suwon-Si
- 专利权人： Samsung Electronics Co., Ltd.
- 当前专利权人： Samsung Electronics Co., Ltd.
- 当前专利权人地址： KR Suwon-Si
- 代理机构： Staas & Halsey LLP
- 优先权： KR10-2003-0014477 20030307
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
A front photo detector (FPD) of an optical pick-up for an optical recording and playing apparatus having no gain selection switch, a simplified configuration, an improved prevention of an abnormal operation due to an error in gain selection, and improved reliability. The front photo detector includes a photo diode unit, a current-voltage amplifying circuit, and a voltage amplifying unit. The photo diode unit outputs current proportional to the power of the light emitted from one of a plurality of laser diodes. The current-voltage amplifying circuit converts the current output from the photo diode unit into a voltage. The voltage amplifying circuit amplifies the voltage output from the current-voltage amplifying circuit by a predetermined gain.
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