| abstract |
PROBLEM TO BE SOLVED: To reduce the size of a circuit for detecting the rotational position of a vacuum variable capacitor 5, extend the mechanical life, and eliminate the need for data measurement or adjustment of circuit component constants for each vacuum variable capacitor 5. I do. The present invention relates to a vacuum variable capacitor (5). The code wheel 14 having the slit is rotated in accordance with the rotation of the rotating shaft of the above, the presence or absence of the slit of the code wheel 14 is detected in a non-contact manner, and a slit presence / absence detection signal is output, and the number of the slit presence / absence detection signals is counted Then, the rotation position of the vacuum variable capacitor 5 is determined. |