Abstract: A crystal vibrator is provided that includes a base having a main surface, a piezoelectric vibration element mounted on the main surface of the base, a cover that has a recess in which the piezoelectric vibration element is accommodated and that is tougher than the base, and a bonding member that is provided in a frame-like shape so as to surround the piezoelectric vibration element when the main surface of the base is seen in plan view and that bonds the base to the cover. When the main surface of the base is seen in plan view, at least part of an outer edge part of the cover member is located outside the base.

Abstract: A piezoelectric electroacoustic transducer, including a plurality of piezoelectric layers deposited to define a deposited product, flexurally vibrates the deposited product by polarizing the entire piezoelectric ceramic layers in the same thickness direction and also by applying an alternating signal between external electrodes disposed on the front/rear major surfaces of the deposited product and an internal electrode disposed between the ceramic layers. A dummy electrode is provided between the ceramic layers outside the internal electrode via a gap, and a portion of the internal electrode is exposed at at least one side surface of the piezoelectric ceramic layers, while the dummy electrode is exposed at the other side surface of the piezoelectric ceramic layers. The external electrodes extend to the side surfaces other than the side surface at which the internal electrode is exposed.

Abstract: A method for adjusting the frequency of a piezoelectric resonator allows for frequency adjustments to be individually made for each of a plurality of elements disposed on a piezoelectric substrate before the resonator is completed. Moreover, the frequency adjustments can be made with high accuracy in a relatively short time. When adjusting the frequency of each element, an ion beam is irradiated onto a plurality of electrodes disposed on the piezoelectric substrate to etch the electrodes.

Abstract: A piezoelectric electroacoustic transducer that is capable of preventing a short-circuit between an internal electrode and external electrode and also capable of preventing cracks of ceramic layers during polarization to improve a yielding rate. A piezoelectric electroacoustic transducer, including a plurality of piezoelectric layers deposited to define a deposited product, flexually vibrates the deposited product by polarizing the entire piezoelectric ceramic layers in the same thickness direction and also by applying an alternating signal between external electrodes disposed on the front/rear major surfaces of the deposited product and an internal electrode disposed between the ceramic layers. A dummy electrode is provided between the ceramic layers outside the internal electrode via a gap, and a portion of the internal electrode is exposed at at least one side surface of the piezoelectric ceramic layers, while the dummy electrode is exposed at the other side surface of the piezoelectric ceramic layers.

Abstract: A method of adjusting a frequency of an energy-trap type piezoelectric resonance element includes the steps of preparing a piezoelectric resonance element including first and second vibration electrodes formed partially on both of the main surfaces of a piezoelectric plate, the thickness of the first vibration electrode being larger than that of the second vibration electrode, and modifying the first vibration electrode or the second vibration electrode in such a manner that the thicknesses of the first and second vibration electrode electrodes are substantially equal to each other such that the piezoelectric resonance element has a desired frequency.

Abstract: A method for adjusting the frequency of a piezoelectric resonator allows for frequency adjustments to be individually made for each of a plurality of elements disposed on a piezoelectric substrate before the resonator is completed. Moreover, the frequency adjustments can be made with high accuracy in a relatively short time. When adjusting the frequency of each element, an ion beam is irradiated onto a plurality of electrodes disposed on the piezoelectric substrate to etch the electrodes.

Abstract: A deflection yoke device of the present invention includes a unit bobbin to be mounted in such a manner as to be fitted in a head portion side of a deflection yoke bobbin. The unit bobbin has two coil winding portions disposed at either or both of top and bottom sides of the deflection yoke so that magnetic leakage-protecting coils can be formed by directly winding a wire around the coil winding portions. The unit bobbin further includes terminals for fixing lead wires extracted from the magnetic leakage-protecting coils.