发明名称 |
Light receiving circuit, semiconductor laser device, and optical pickup device |
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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申请公布号 |
US7470886(B2) |
申请公布日期 |
2008.12.30 |
申请号 |
US20060328139 |
申请日期 |
2006.01.10 |
申请人 |
PANASONIC CORPORATION |
发明人 |
SHIMIZU YUZO;YASUKAWA HISATADA;HAMAGUCHI SHINICHI;IMAIZUMI KENJI;MIYAMOTO SHINICHI;KUROIWA YOSUKE |
分类号 |
H03F3/08 |
主分类号 |
H03F3/08 |
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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