JPS59122010A - Piezoelectric oscillation parts - Google Patents

Abstract

PURPOSE:To obtain piezoelectric oscillation parts which have simple terminal shapes and never impede oscillations of a piezoelectric element, by using a resonator in an energy confined type oscillation mode as the piezoelectric element and making the case part of the circumference of an oscillation area larger than the remaining part. CONSTITUTION:Piezoelectric oscillation parts 21 have a cylindrical glass case 22 which has openings at both ends. Those opening end parts 23 and 23 are reduced in diameter to small values. The opening end parts 23 and 23 are covered with metallic caps 25 and 25, which are charged with conductive jointing materials 26 such as conductive paint and conductive adhesives. Consequently, respective terminals of the piezoelectric element 24 are connected to the metallic caps 25 and 25 electrically and mechanically through those members 26. This piezoelectric element 24 is the resonator, in what is called, energy confined type thickness sliding oscillation mode formed by providing counter electrodes 24b and 24C which face each other partially to both surface of, for example, a rectangular piezoelectric substrate 24a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric vibrating component formed by enclosing a piezoelectric element in a cylindrical case and forming it into a chip.

In such a piezoelectric vibrating component, as shown in FIG. In some cases, the piezoelectric element 1 is supported by the recesses 5, 5 of the terminals 4, 4. Note that 6 and 6 are conductive joining members. However, in this conventional device, the shapes of the terminals 4, 4 are complicated, which hinders cost reduction.

In view of the above, the present invention seeks to provide a piezoelectric vibrating component that has a simple terminal shape and a structure that does not impede the vibration of the piezoelectric element.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

The mold vibrating component 21 has a cylindrical glass case 22. This glass case 22 is made of a transparent or semi-transparent material. Further, both ends of this glass case 22 are open. Both open ends 23, 23 are narrowed down to a small diameter. Metal caps 25 are attached to both ends 23, 23.
．． 25 is covered. The metal caps 25, 25 are filled with a conductive bonding member 26 such as cream solder, conductive paint, conductive adhesive, or the like.

For this reason, each end of the piezoelectric element 24 is electrically and mechanically connected to the metal cap via this part 26.

Here, this piezoelectric element 24 is, for example, a rectangular plate-shaped piezoelectric base plate 2.
Opposing electrodes 24b partially facing each other on both sides of 4a
, 24c is a so-called energy-confined thickness-shear vibration mode resonator. Note that the glass case 22 may have a rectangular tube shape or a tube shape with different diameters instead of a cylindrical shape. Further, one of the open end portions 23.degree. 23 of the glass case 22 may be narrowed down. Furthermore, the pattern of the opposing types 1i24b, 24c of the piezoelectric element 24 is not particularly limited, and may be appropriately selected depending on desired resonance characteristics. Metal cap 2! i and 25 may be omitted and their functions may be substituted with solder, conductive paint, or conductive adhesive. In addition, although the case 22 in the figure is slightly emphasized and drawn in a shape that is considerably swollen at the center, the case 22 is drawn in a shape that does not interfere with the vibration of the piezoelectric element 24.
For this reason, it is sufficient to have a small gap, usually not visible to the naked eye, so it is sufficient that the inner diameter is large in the center to the extent that it is invisible to the naked eye.

A case with such a structure can be easily obtained using ceramic materials such as glass and alumina.

As described above, according to the present invention, the configuration of the opening end of the case is simplified, and the case shape is such that the vibrating portion of the piezoelectric element does not come into contact with it, so that an inexpensive chip-shaped piezoelectric vibrating component can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional example, FIGS. 2 to 4 show an embodiment of the present invention, FIG. 2 is a perspective view, and FIG. 3 is a vertical sectional view of the conventional example.
FIG. 4 is a longitudinal cross-sectional view taken along line -■, and FIG. 4 is a cross-sectional view taken along line IV--IV in FIG. 22...Glass case, 23...Front end of glass case 22, 24...Piezoelectric element,
25...terminal, 27...conductive joint parts A. Patent applicant Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] (1) It has a cylindrical case, the front end of this case is coated with an electrically conductive material in a ring shape, a piezoelectric element is housed in the case, and the end of this piezoelectric element is supported by the electrically conductive material. The piezoelectric vibrating component is characterized in that the piezoelectric element is a resonator using an energy confinement type vibration mode, and the inner diameter of the case portion around the vibrating region is larger than that of the remaining portion.