Patent ID: 7616527
Filing Date: 2009-11-10
Classification: G04C

Abstract:
1. An electronic timepiece comprising: a rotor; a calendar display mechanism having a calendar display function to display a calendar including day, month, and year, said calendar display mechanism being configured to rotate one or a plurality of calendar display wheels by a rotational drive of said rotor through a gear train, said calendar display wheels including a day wheel displaying said day; an piezoelectric actuator being configured to rotate said rotor; a gear being configured in said gear train; a mechanical switch being configured to operate in conjunction with rotation of said gear, an amount of rotation of said rotor being detected by a detecting operation of said mechanical switch; a plurality of detection wheels formed on said calendar display wheels or said gear that rotates in linkage with said calendar display wheels, said detection wheels including a month detection wheel for detection of month, and a year detection wheel for detection of year; a control; a noncontact detector being configured to perform noncontact-type detection of a rotation position of said day wheel; and a contact detector being configured to perform a contact-type detection of a rotation position of said month detection wheel, or said year detection wheel, said piezoelectric actuator being stopped based on a detection result of said amount of the rotation by said detecting operation of said mechanical switch, at least one of said day wheel, said month wheel, and said year wheel being detected to confirm whether or not further detection is necessary for end of month correction of said calendar, said control confirming whether or not said month has 31 days, said control confirming whether tens-column place value of said day is 1 or 0, after said month is confirmed to have fewer than 31 days, said control confirming what ones-column place value of said day is, after said tenth digit of said day is confirmed to be not 1 or 0, said control determining whether or not date including said month and said day exists, said control displaying an existing day instead of said date, if said date is determined to be nonexistent.