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 and carrying out the tuning operation by means of a knob equivalent to a crown of the wristwatch. CONSTITUTION:An inductance 7 is adhered fixidely to a connecting metallic parts 16 of a watchband 15 via an insulator 17. The inductance 7 constitutes a tuning circuit and at the same time serves as an antenna. A shaft 22 provided to a wristwatch main body 14 is formed into a knob having a corm of a crown. This knob is turned to vary the resistance value of a variable resistor 10 to vary the voltage to be applied to a varactor. Thus the capacity value is changed, and then the harmonic voltage is varied. A microminiature variable capacitor, a voltage variable inductor or a miniature rotary variable inductor is applicable to a frequency selecting means.

Inventors

• 👤 Koichi Nakagawa
• 👤 浩一 中川

Bibliographic Details