<p>A thin metal film resistor (15) of a capacitative graphic tablet is trimmed to make the resistor linear within about 0.25%. Alternating voltage is applied along the resistor by a source (40). The resistance of the resistor is measured at discrete points by a capacitative probe (34) and the resistance readings are stored in a data processor (45). A profile is calculated in the processor from the stored readings and a trim operation is made by an electro-erosion apparatus.</p>
申请公布号
EP0055331(A2)
申请公布日期
1982.07.07
申请号
EP19810107584
申请日期
1981.09.23
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
HEVESI, JOSEPH FRANCIS;KAMBIC, STANLEY FRANK;KLUEPFEL, JOSEPH BRUNO;SCHMIDT, FRANK JOHN;VAN DUYNHOVEN, THOMAS JEROME