| 摘要 |
A coding element (CE), for example a rotary coding element (Fig. 1), has a surface provided with two signals tracks (SB1, SB2), preferably adjacent and at a constant distance apart, subdivided longitudinally into sectors (SK) for coding purposes. During operation, each signal track (SB1, SB2) or its sectors (SK) is scanned by at least one scanning element (AE1, AE2), in order to obtain the code corresponing to the instantaneous displacement from the scan signal. The coding elment (CE) contains an insulator (IS) in such a way that the areas of the surface of the coding element (CE) which carry the signal tracks (SB1, SB2) form an insulating surface (IS). The sectors (SK) of the signal tracks (SB1, SB2) are electrically conducting and during operation, i.e. scanning, have more than two different electric potentials, thereby enabling electrically conducting scanning elements (AE1, AE2) to scan a code composed of digits having more than two possible levels of potential.
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