Electromagnetic acoustic transducer

Horology: time measuring systems or devices – Signalling means – Time condition responsive

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Details

368255, 368 72, 368 73, 179117, G04C 2116

Patent

active

043915329

ABSTRACT:
An alarm electronic wristwatch has an electromagnetic acoustic transducer having a base plate having a plurality of upstanding projections, and a lead substrate superposed on the base plate and having a plurality of openings dimensioned to receive respective ones of the projections. The cooperation between the projections and openings enable precise positioning of the lead substrate on the base plate. The lead substrate has a set of cut-out or recessed portions in which are mounted permanent magnets. A magnetic core and excitation coil are mounted on the base plate and the terminals of the excitation coil are connected to an electrode pattern formed on the upper surface of the lead substrate. The lead substrate extends laterally of the transducer to enable electrical connection to a circuit block of the wristwatch from which drive signals may be applied to the excitation coil. A vibratory plate is mounted in spaced-apart relationship from the permanent magnets and the magnetic core so that energization of the coil at pre-selected alarm times effects vibration of the vibratory plate at a frequency effective to produce an audible sound.

REFERENCES:
patent: 4075626 (1978-02-01), Sakaguchi et al.
patent: 4222089 (1980-09-01), MacAskill, Jr. et al.
patent: 4226491 (1980-10-01), Kazama et al.
patent: 4245274 (1981-01-01), MacDonald et al.
patent: 4295181 (1981-10-01), Chang et al.

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