| 摘要 |
A temperature controller 51 is disclosed, which comprises a temperature control element 53 disposed on the bottom of a case 52, a light-waveguide element 11 and a metal plate 55 intervening between the elements 53 and 11. The metal groove 55 has a groove, in which a temperature sensor 36 is buried together with a highly heat conductive material. The detected temperature output of the temperature sensor 36 is inputted to a temperature control circuit 58 for controlling the temperature of the temperature control element 53. The temperature sensor 36 inclusive of its lead lines are buried in the metal plate 55 such as to cover a long distance. Thus, the temperature control is less subject to the influence of the ambient temperature and can thus be made with high accuracy.
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