Position sensing apparatus

摘要: Position sensing apparatus comprising two coil arrangements movable relative to each other, the first arrangement being a side-by-side array of elongate loops defining writing area and second single or multiple loose coupled with in array. The have phase-shifting units between them so that they give an output which is unambiguously progressively phase-characterized dependent upon position on direction Two layers can be provided one layer are at right angles those other "x" "y" co-ordinate positioning. phase shift over may less than 360°, greater 360° use ambiguity eliminating circuit. comprise coils carried pen spaced from tip connected indefiniteness does not arise as tilted. Apparatus according invention its processed for line transmission stock ordering accounting purposes signature verification.