| 摘要 |
1469008 Semi-conductor thermal relays MULTI-STATE DEVICES Ltd 23 Dec 1974 [7 Jan 1974] 55577/74 Heading H1K In a semi-conductor thermal relay device the heater film 52 and a sensing layer of material 42 which undergoes a large change in impedance at a critical temperature are deposited on separate substrates 50, 40 which are then bonded together. The heater and sensing films each have contacts 54, 44 for connection to current leads 56, 48 and thence to a controlled circuit. As shown, the substrates are mounted one above the other on a header 58, the upper substrate 40 being of good thermal conductivity, e.g. sapphire, Al 2 O 3 or BeO. The film 42 may be of VO 2 , V 2 O 3 , V 3 O 5 , Ti 3 O 5 or Ag 2 S. The lower substrate 50 is a good thermal insulator such as quartz or glass and the heater film 52 may be of Ni/Cr alloy with a Au coating or of Pt. In a temperature compensated relay arrangement the substrate 40 carries two sensing layers which receive heat from the heater film 52 in a desired ratio. |
