| 摘要 |
<p>PURPOSE:To adjust linearity of a variable resistor by measuring resistance values between intermediate electrodes and both end electrodes of a double-layer resistor and changing the resistance values of the resistors on the necessary parts so as to have a theoretic resistance ratio. CONSTITUTION:Ag electrodes 3 are formed on the substrate 1, wherein copper foils 2 are etched in a required form, by screen-printing silver paste on both end parts of the resistance and a current collecting part of a variable resistor followed by thermal hardening to form electrodes 3. At this time, simultaneously intermediate electrodes 4 are formed on both ends in the working range of the variable resistor. Next, carbon paste having sheet resistance 350OMEGA/square is screen-printed on a lower resistor for being thermally hardened. At this time, simultaneously the same carbon paste is printed and thermally hardened on the current collecting part for forming a collecting part resistor 6. Next, resistance R1 between a GND electrode 12 and a first intermediate electrodes 13, resistance R4 between the electrode 13 and a second intermediate electrode 14 and resistance R3 between the electrode 14 and a Vcc electrodes 15 are measured. Next, linearity can be adjusted by changing the resistance values so that the resistance R1, R2 and R3 may have a theoretic resistance ratio.</p> |
