| 摘要 |
An electronic vernier linear or rotary measuring apparatus utilizes groups of stationary conductive plates 22 and a movable conductive wide bar 24. The wide bar is capacitively coupled to stationary commutator-like conductive strips 48 to provide a greatest capacitance when the movable bar is positioned juxtaposed with one of the stationary plates and a portion of the stationary commutator element. Individual plates of sub-pluralities of stationary plates are electrically interconnected to individual plates of adjacent sub-pluralities of stationary plates. Each of the stationary plates is provided with a stripe-like portion directed towards its associated commutator-like element. An RC oscillator circuit 156 is selectively coupled via gates TG1 to TG12 to each commutator-like element for a time period, during which each of the stationary plates in a sub-plurality is likewise coupled to the frequency determining input terminals of the oscillator circuit. Frequency of the oscillator is monitored each time an individual stationary plate of a sub-plurality is connected into the oscillator circuit. Vernier measurements are accomplished by comparing the output frequency of the RC oscillator 156 circuit during changes in capacitance, determined by the location of a plurality of vernier-like disposed narrow movable conducting bars, carried on the substrate. <IMAGE> |
