1976-04-15
1978-01-17
Schaefer, Robert K.
58 38R, 58 575, G04B 1930
Patent
active
040684610
ABSTRACT:
A digital electronic wristwatch is provided with an alarm which includes a piezoelectric crystal mounted to vibrate a watch element. The piezoelectric crystal is supplied with a pair of signals, each having a peak voltage equal to that of the battery, but one of these signals is inverted, resulting in a peak-to-peak voltage which is higher than that normally available from the batteries located within the wristwatch housing. Such driving substantially increases the sound output of the crystal due to the effective voltage increase. A unique spring contact arrangement is used to connect the piezoelectric crystal to the watch electronics, and to permit easy removal of the piezoelectric crystal for battery replacement or watch repair. In addition, a flexible mounting arrangement increases the sound output from the alarm while providing water and dust protection for the watch.
REFERENCES:
patent: 3638223 (1972-01-01), Potter
patent: 3697983 (1972-10-01), Potter
patent: 3759029 (1973-09-01), Komaki
patent: 3788060 (1974-01-01), Kawamura
patent: 3872470 (1975-03-01), Hoerz et al.
patent: 3879931 (1975-04-01), Tasuda et al.
patent: 3906713 (1975-09-01), Suda et al.
patent: 3977177 (1976-08-01), Egger
Fassett John R.
George Joseph P.
Rondas Ivan V.
Sondermann Claus
Frontier Inc.
Miska Vit W.
Schaefer Robert K.
LandOfFree
Digital electronic alarm watch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital electronic alarm watch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital electronic alarm watch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2276347