Autonomous radio timepiece

Details Autonomous radio timepiece Autonomous radio timepiece

1991-07-18

1993-08-10

Roskoski, Bernard

Horology: time measuring systems or devices

Plural timepiece system or system device

With wireless synchronization

368 10, 368 55, G04C 1102

Patent

active

052355632

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 current (39.2) thereof cannot be compensated in the antenna coil (33), remains deactivated during the operation of the receiver and is assigned to the display means (19) with the slowest advancing action, for example, the hour hand in case of a separate drive of the minute and possibly the seconds hand.

REFERENCES:
patent: 4645357 (1987-02-01), Allgaier et al.
patent: 4650344 (1987-03-01), Allgaier et al.
patent: 5083123 (1992-01-01), Ganter et al.
patent: 5105396 (1992-04-01), Ganter et al.

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