A watch with an electronic buzzer which comprises a double-constructed back cover including an inner back cover on which a piezoelectric element is mounted to produce a mechanical buzz sound when a voltage is applied thereto and an outer back cover provided with a plurality of small holes for enhancing transmission of the buzz. A driving circuit for actuating or energizing the piezoelectric element is disposed in the watch case releasably from the back cover and the piezoelectric element. This construction enables the watch to be made small in size and assures the watertightness of the watch.
A watch includes a housing including an apertured sound transmitting housing portion. A diaphragm is carried by the housing. A piezo electric element is carried by one surface of the diaphragm and is oscillatable in response to electrical excitation. Excitation circuitry is connected between the piezo electrical element and a power source of a watch in producing an excitation signal to oscillate the piezo electric element. The diaphragm comprises an electrically insulative material. The excitation circuit is carried by the one surface of the diaphragm, thereby eliminating the need for additional components to carry the excitation circuit.
An electronic wristwatch with an electronic sound emitter device which provides greatly improved efficiency in the quality and quantity of the sound emitted with a minimum number of elements. The results, in general, are obtained by arranging the elements in such a manner that a suitable signal is presented to the sound emitter driving device upon the coincidence of a preset time and the time given by a time display device.
A wristwatch having a piezoelectric buzzer therein includes a watch case and a case back. The piezoelectric buzzer includes a piezoelectric element mounted on the case back inside the watch case. A driver selectively applies signals having a frequency of about 4 kHz to the buzzer. The case back, acting as the vibration plate for the piezoelectric element, is constructed so that the resonance frequency thereof is between 5.5 kHz and 7 kHz.
A wrist watch with an alarm having a vibratory plate supported at a point inside the bottom housing of the wrist watch. The vibratory plate comprises a piezoelectric element, a base electrode fixed on one side of the element. Audible time sound is emitted through the bottom housing, which produces transmitted vibrations by the application of AC voltage to the piezoelectric element.
An alarm timepiece the internal movements and electronic components of which can be arranged and accommodated more efficiently in that the alarm diaphragm with a piezo-electric element attached thereto is obliquely mounted within the frame of the timepiece to lean from the bottom of the timepiece frame against a rising part of the side of the frame. This arrangement taken in conjunction with a sound emitting opening situated between the outer circumference of the bottom and the rising part of the frame of the timepiece provide an unobstructed path for the alarm sound while taking advantage of otherwise vacant space within the internal movement and electronic component compartment of the timepiece.
