| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve a resistor provided with a resistive laminate, composed of a plurality of resistors laminated on the surface of an insulating board to be improved in long-term stability, by reducing its temperature coefficient of resistance TCR to zero over a wide range of temperature. SOLUTION: When the rote of change of a resistance with temperature [Δt] for eaching resistor layer of the resistive laminate is approximated by the quadratic formula, [αΔt+β(Δt)2], or the formula of higher order, at least the signs of the linear temperature coefficientαand quadratic temperature coefficientβof a certain resistor layer are set opposite to those of the other resistor layer. A resistor layer of superior long-term reliability, how ever, is used as the uppermost layer of the resistive laminate. At least,αandβmay be both set positive for one of the resistor layers, andαandβbe both set negative for the other of the resistor layers. At least, one of the resistor layers may be formed of Ni-Cr alloy.</p> |
