Autonomous radio-controlled timepiece

US5144599A · kind A · utility

Assignee

• Junghans Uhren GmbH · DE

Inventors

• Wilfried Blaich · Schramberg, DE
• Oskar Flaig · Dunningen, DE
• Wolfgang Ganter · Schramberg, DE
• Hans Kaiser
• Ewald Kussmaul · Freudenstadt, DE
• Roland Maurer · Lauterbach, DE
• Peter Riis · Deißlingen, DE

Key dates

• Filing date: Dec 28, 1990
• Grant date: Sep 1, 1992
• Expiry date: Dec 28, 2010

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q1/273
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An autonomous radio timepiece comprises a casing and a bracelet attached thereto. The casing includes an operating circuit, while the bracelet carries a flexible antenna. The antenna can be removed from the bracelet in the event that the bracelet is worn and must be discarded. The antenna carries a plug-in type connector at one end which is adapted to make a tight sealing connection with the casing, and is also adapted to electrically connect the antenna with the circuit of the casing. The circuit within the casing includes a receiver which is fixedly tuned as a function of the antenna inductivity of a foil core to the time message transmitter. Also provided is a variable automatic supplemental tuner to compensate for bending of the bracelet while the receiver is actuated. The antenna comprises a foil of an insulting material on which an antenna conductor is printed, along with two shielding conductors extending parallel to the antenna conductor.