| 摘要 |
PURPOSE:To obtain a temperature sensor characterized by excellent thermal coupling, excellent heat radiation and a compact configuration, by providing a metal substrate having excellent thermal conductivity, a heating resistor and a PTC device (comprising a material having a positive temperature coefficient). CONSTITUTION:One end of a heating resistor 15 is connected to a fixed pad 18 through a conducting paste 19. The other end thereof is connected to an external lead 20. The resistor 15 is extended to the vicinity of the pad 18 and also to a part under the PTC device 10 in order to enhance thermal coupling. Attaching electrodes 13 and 13 of the device 10 are soldered to the pad 18. The device 10 can be readily assembled as a chip part by a face down method. In this sensor, the lead 20 is connected to the pad 18 and one end of the resistor 15, and thereafter the entire body is coated by a molding resin 21. Meanwhile, heat from the resistor 15 is conducted to the device 10 in the path of a thin insulating layer 16 a substrate 14 the thin film 16 the pad 18 the electrode 13. Thus the excellent thermal coupling is obtained. This is because the thermal coupling is achieved through the metallic material. |
