Light receiving circuit, semiconductor laser device, and optical pickup device

A light receiving circuit comprising a light receiving section, and a photocurrent/voltage conversion amplifier for amplifying a photocurrent photoelectrically converted in said light receiving section, wherein

• a light transmitting member is disposed on said light receiving section, said light transmitting member having a temperature coefficient of a transmittance of said light transmitting member in accordance with a change in wavelength of a light transmitting therethrough;
• a feedback resistor related to a gain is connected to said photocurrent/voltage conversion amplifier, said feedback resistor having a temperature coefficient of a resistance in accordance with a temperature change;
• and
• said temperature coefficient of the transmittance and said temperature coefficient of the resistance are set so that an output voltage from said photocurrent/voltage conversion amplifier may be substantially constant to the temperature change.

A light receiving circuit comprising a light receiving section, and a photocurrent/voltage conversion amplifier for amplifying a photocurrent photoelectrically converted in said light receiving section, wherein

• a protective film is formed on said light receiving section while a light transmitting member is disposed thereon, said protective film and said light transmitting member respectively having temperature coefficients of transmittances in accordance with a change in wavelength of a light transmitting therethrough;
• a feedback resistor related to a gain is connected to the photocurrent/voltage conversion amplifier, said feedback resistor having a temperature coefficient of a resistance in accordance with a temperature change;
• and
• the temperature coefficients of said transmittances of said protective film and said light transmitting member, and the temperature coefficient of said resistance are set so that an output voltage from said photocurrent/voltage conversion amplifier may be substantially constant to the temperature change.