Patent ID: 6278661
Filing Date: 2001-08-21
Classification: G04C

Abstract:
An electronic timepiece having a device for automatically adjusting month-end dates of calendar, comprising:a date dial formed on a rear surface thereof with a detection pattern composed of a reflective part and a non-reflective part both corresponding to a date display formed on a front surface of said date dial;a 24-hour switch for generating a date dial drive signal every 24 hours;a photo sensor mechanism, having a light emitting part and a photo detecting part, for reading a boundary between said reflective part and said non-reflective part of said detection pattern when said date dial moves;a control circuit for determining a date formed on said date dial through a perpetual calendar circuit and outputting a necessary additional date dial drive signal by receiving said date dial drive signal from said 24-hour switch, outputting said date dial drive signal, receiving a signal from said photo sensor mechanism; anda date dial driving mechanism for driving said date dial according to said date dial drive signal.