发明授权
US07470886B2 Light receiving circuit, semiconductor laser device, and optical pickup device
失效
光接收电路，半导体激光器件和光学拾取器件
- 专利标题： Light receiving circuit, semiconductor laser device, and optical pickup device
- 专利标题（中）： 光接收电路，半导体激光器件和光学拾取器件
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申请号： US11328139申请日： 2006-01-10
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公开(公告)号： US07470886B2公开(公告)日： 2008-12-30
- 发明人: Yuzo Shimizu , Hisatada Yasukawa , Shinichi Hamaguchi , Kenji Imaizumi , Shinichi Miyamoto , Yosuke Kuroiwa
- 申请人： Yuzo Shimizu , Hisatada Yasukawa , Shinichi Hamaguchi , Kenji Imaizumi , Shinichi Miyamoto , Yosuke Kuroiwa
- 申请人地址： JP Osaka
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Dickinson Wright, PLLC
- 优先权： JP2005-115754 20050413
- 主分类号： H03F3/08
- IPC分类号： H03F3/08
摘要：
There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration.The light receiving circuit is provided with a photodiode 4 for LD power monitoring and an I-V amplifier 5 connected with a feedback resistor 13, wherein a light receiving section 16 of the photodiode 4 is covered with a protective film 19. Temperature dependences between a light transmittance of the protective film 19 in accordance-with a shift of a wavelength of a laser beam due to a change in ambient temperature, and a resistance value of the feedback resistor 13 are set in such a way that they may be mutually compensated and an output voltage from the light receiving circuit may be constant for a temperature change.
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