| 摘要 |
PROBLEM TO BE SOLVED: To obtain stable output without using an electronic cooling element, by arranging a heater on an insulating substrate of a semiconductor module on which substrate a light emitting element is mounted. SOLUTION: A heater 7 is arranged on an insulating substrate 4. From the resistance value of a thermistor 10, the temperature of an LD element 2 is monitored. By controlling the heater 7 with an external automatic temperature control circuit, the temperature is adjusted. At the time of high temperature operation of the LD element 2, the heater 7 is not used, and natural cooling is performed. Thereby the temperature of the LD element can be kept high, and stable output can be obtained without using an electronic cooling element. A module can be miniaturized, and cost reduction is realized. |
