Autonomous radio timepiece

US5235563A · kind A · utility

Assignee

• Junghans Uhren GmbH · DE

Inventors

• Wolfgang Ganter · Schramberg, DE
• Oskar Flaig · Dunningen, DE
• Roland Maurer · Lauterbach, DE

Key dates

• Filing date: Jul 18, 1991
• Grant date: Aug 10, 1993
• Expiry date: Jul 18, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G04R60/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An autonomous radio timepiece (11) with a magnetic antenna (14) located in the vicinity of a electromechanical transducer (25) for driving a time display (19), in order to obtain a radio timepiece with a small volume and operable in a compact manner. To avoid electromagnetic interference with the antenna inlet of a tuned radio-frequency receiver (12), the transducer (25) is deactivated while the receiver (12) is actuated for the reception and coding of an absolute time information (15) transmitted by radio. A subsequent recovery of the transducer drive pulses (42) for autonomous time keeping corrects the display (19). However, a transducer (25.1) may remain in uninterrupted operation if it is located relative to the antenna coil (33) with the relative position of its core (34) in a manner such that components of the stray current or electro magnetic field (39) exiting from the frontal side of the transducer field coil (39) in a fan-like manner passes through the antenna coil (33) in opposite directions, so that the two components (39a, 39b) of the stray current offset or cancel each other out. In a two-motor radio timepiece mechanism, the second transducer (25.2), the stator stray …