EP 0055331 A2 19820707 - Method of trimming thin metal resistors.
Title (en)
Method of trimming thin metal resistors.
Title (de)
Verfahren zum Abgleichen von Metalldünnschichtwiderständen.
Title (fr)
Procédé pour ajuster des résistances à film mince en métal.
Publication
Application
Priority
US 22169580 A 19801231
Abstract (en)
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.
IPC 1-7
IPC 8 full level
G01R 27/02 (2006.01); H01C 17/22 (2006.01); H01C 17/24 (2006.01)
CPC (source: EP)
H01C 17/22 (2013.01); H01C 17/2408 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0055331 A2 19820707; EP 0055331 A3 19830518; EP 0055331 B1 19850515; DE 3170519 D1 19850620; JP S57121201 A 19820728; JP S6117124 B2 19860506
DOCDB simple family (application)
EP 81107584 A 19810923; DE 3170519 T 19810923; JP 16654881 A 19811020