| 摘要 |
Rotation detector having electrodes (211, 212, 221, 222, 231), which are provided on a first, rigidly mounted plate (11), a rotatable plate (12) and on a second, rigidly mounted plate (13), and having a rotation detector unit (300) having series-connected inverters (301, 302, 303) and a frequency-detector circuit (306). The speed of the rotatable plate (12) is determined by the work of an equivalent RC resonant circuit or of an equivalent parallel resonant circuit which is formed by the electrodes (211, 212, 221, 222, 231) on the rigidly mounted plates (11, 13) and the rotatable plate (12) and the circuits of the rotation detector unit (300). <IMAGE>
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