Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-01-10
2008-12-30
Yam, Stephen (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140AG, C250S2140LS, C250S226000, C369S112220, C369S134000, C372S029021, C372S033000
Reexamination Certificate
active
07470886
ABSTRACT:
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 photodiode4for LD power monitoring and an I-V amplifier5connected with a feedback resistor13, wherein a light receiving section16of the photodiode4is covered with a protective film19. Temperature dependences between a light transmittance of the protective film19in 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 resistor13are 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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Hamaguchi Shin-ichi
Imaizumi Kenji
Kuroiwa Yosuke
Miyamoto Shinichi
Shimizu Yuzo
Dickinson Wright PLLC
Panasonic Corporation
Yam Stephen
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