This invention relates to an electronic alarm wristwatch wherein apertures are provided on the back cover to release alarm sound generating upon the coincidence of the time preset by an alarm-presetting device and that designated by a time display or time keeping means. A sound-emitting piezo-electric or electro-strictive element is fixed to the membrane which is dish-shaped and has a plurality of concentric wrinkles, said membrane is so placed in the watch case as not to waste any space and insures water- and dust-proofing. A distribution board is fixed to the wrinkled portion of said membrane to provide the required electric current, thereby providing an electric alarm watch which sounds freely and is not disturbed by oscillation of the wrist.
A wrist watch with health care function consists of a mechanism (core), a case and a back cover of a wrist watch having timekeeping function. A magnetic body is placed in the back cover of the wrist watch. Between the magnetic body and the mechanism (core) of the wrist watch is a magnetic isolating body which is formed by the back cover itself or which is a -shaped magnetic isolating shield or a magnetic isolating piece covered on the magnetic body in the back cover so that the wrist watch can both tell time (maintaining the accuracy of timekeeping) and provided the function of health care for treating or preventing from human diseases through the action of the magnetic source.
A piezoelectric signaling device that produces a predetermined number of audio signals when activated. The device includes a timer, a pulser, an audio oscillator, and a piezoelectric transducer. The timer enables the pulser for a predetermined time. While enabled, the pulser produces pulses at a predetermined rate, thus producing a predetermined number of pulses. The oscillator is enabled during the pulses to produce a predetermined number of pulses of audio frequency electrical oscillations which are applied to the piezoelectric transducer to produce the predetermined number of audio signals.
An alarm device for a watch mounted in a recess provided in an upper portion of the watch case, for example in the upper portion of the band connecting portion of the watch case. The alarm device comprises a vibration plate secured to the bottom of the recess, a watertight sealing member, a cover for the vibration plate and securing means such as a screw for fixing the vibration plate to the recess through the watertight sealing member.
An alarm device for a watch mounted in a recess provided in an upper portion of the watch case, for example in the upper portion of the band connecting portion of the watch case. The alarm device comprises a vibration plate secured to the bottom of the recess, a watertight sealing member, a cover for the vibration plate and securing means such as a screw for fixing the vibration plate to the recess through the watertight sealing member.
An alarm device for a watch mounted in a recess provided in an upper portion of the watch case, for example in the upper portion of the band connecting portion of the watch case. The alarm device comprises a vibration plate secured to the bottom of the recess, a watertight sealing member, a cover for the vibration plate and securing means such as a screw for fixing the vibration plate to the recess through the watertight sealing member.
