炭素被膜抵抗体について

概要

論文の詳細を見る
A carbon film variable resistor is generally used as a non-metallic resistor, it is made by the carbon black or graphite granules are mixed with binder and spattered on the phenol base plate. A resistance of the carbon resistor changes by temperature and relative humidity, the absolute value of the temperature coefficient of resistance becomes to small with temperature rise and with the thickness of carbon film increases much more. For a humidity, a resistance of the carbon resistor increases following to humidity rise, the humidity coefficient of resistance is negative in the case of lower value for the standard humidity, and is positive in the opposite case. A percentage of the resistance variation is proportionate to the values of humidity variation for the standard, and the duration up to rises a constant resistance is also the same. Last of all, it finds out that the much more the volume of carbon powders is, the smaller the size of granule is, and the grooves on the carbon film which are made by sliding of the contactors are deeper for the inner than outer side.
山梨大学の論文
1957-07-10