Wristwatch type radio receiver

Abstract

Abstract PURPOSE:To incorporate a radio receiver into a wristwatch without changing the conventional form of the wristwatch, by assembling an antenna inductor constituting a high frequency tuning circuit to a watchband. CONSTITUTION:A wristwatch main body 14 is built in with a liquid crystal display part 20 which displays the time, a printed circuit board 21 containing a timepiece circuit LSI, an electric circuit IC of a radio receiver, a tuning varactor, etc., and a variable resistor 10 which produces the voltage to vary the capacity of the varactor. The resistor 10 is turned by a shaft 22. On the other hand, an inductor 7 obtained by winding densely a coil round a magnetic material of ferrite, etc. is adhered fixedly to a connecting metallic parts 16 of a watchband 15 via an insulator 17. Thus a tuning inductor which also serves as an antenna is obtained. The inductor 7 is connected to the electric circuit of the main body 14 via a lead wire 18.

Inventors

• 👤 Koichi Nakagawa
• 👤 浩一 中川

Bibliographic Details