| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems wherein conventional systems, such as a mechanical contact switch structure and a position detection mechanism by an optical sensor have the problems of the restriction of arrangement space, increased energy consumption, wear resistance properties, detection resolution, costs, and the like, even though an electric clock requiring the detection of the position of a clock wheel train, such as the correction of the deviation of the display clock of a precision clock such as a radio-controlled clock and an annual rate clock, and the automatic correction of the end of a month in a calender. SOLUTION: A plurality of transmission lines for simultaneously transmitting a plurality of AC electric fields through a wheel train are formed inside a clock. The position information of the wheel train is extracted from a change, in the propagation characteristics of a plurality of transmission line. Then, the position of a mechanical wheel train is subjected to electrical detection control, thus performing synchronization control of a mechanical closing mechanism by a low-power electric clocking mechanism. As an actual example, a signal having different phase and frequency is outputted from transmission electrodes 41 and 42, while pinching the toothed wheel of a detection wheel 43 made of metal having a hole 45. A modulated combined signal is received by a reception electrode 44 depending on the presence or absence of the hole 45, and the position of the detection wheel 43 is detected from the information. COPYRIGHT: (C)2003,JPO
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