| 摘要 |
PCT No. PCT/JP98/04395 Sec. 371 Date Jun. 24, 1999 Sec. 102(e) Date Jun. 24, 1999 PCT Filed Sep. 30, 1998 PCT Pub. No. WO99/17172 PCT Pub. Date Apr. 8, 1999An electronically controlled mechanical timepiece includes: a voltage-controlled oscillator (25) including a generator that uses a rotor (12) driven by a spring (1a) to rotate, and a brake circuit (23) for controlling the rotation cycle of the generator (20); and a rotation control circuit (50) for controlling the rotation cycle of the generator (20) by controlling the brake circuit (23). The rotation control circuit (50) includes a phase-comparison circuit (54) for comparing the phases of rectangular-wave pulses fr output from a VCO (25) and time standard signal fs, and a brake control circuit (56) for inputting, based on an output from the phase-comparison circuit (54), a signal for controlling the brake circuit (23) to a voltage-controlled oscillator (25). By providing the VCO (25) and the phase-comparison circuit (54), PLL control is realized to enable a rapidly responsive system.
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