JPS645373Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a holding and enclosing structure for a piezoelectric vibrating element.

Piezoelectric vibrating components that utilize the spreading vibration mode of a square plate have been put into practical use, and the following structures are available for holding and enclosing piezoelectric vibrating elements.

In FIG. 1, 1 is a piezoelectric vibrating element. The piezoelectric vibrating element 1 has electrodes 3 and 4 formed on the entire surface of the opposing main planes of a square piezoelectric plate 2. Reference numerals 5 and 6 denote terminal plates, which are provided with protrusions 7 and 8 that come into contact with electrodes in the central portion, which are the vibration node points of the piezoelectric vibrating element 1, and lead parts 9 and 10. The piezoelectric vibrating element is housed in a pre-molded exterior case 11 in a state where it is pressed and clamped by the projections 7 and 8 of the terminal plates 5 and 6, and the opening of the exterior case 11 is made of synthetic resin 12. It's blocked.

Such a structure requires a lot of assembly man-hours and is not suitable for mass production. The cost of the outer case is high. In order to provide strength, the thickness of the outer case must be increased, which increases the external dimensions. Furthermore, since the case is generally made of synthetic resin, there are limitations in terms of sealability and moisture absorption resistance.

In FIG. 2 and subsequent figures, the same parts as those in FIG. 1 or other figures are given the same numbers and explanations will be omitted. In the device shown in FIG. 2, a piezoelectric vibrating element 1 is positioned within a frame 13 made of synthetic resin in the shape of an opening.
Both openings of the frame 13 are covered with terminal plates 5 and 6, and the piezoelectric vibrating element 1 is clamped by the protrusions 7 and 8 of the terminal plates 5 and 6. The terminal plates 5 and 6 are fixed to the frame 13 by, for example, caulking, adhesion, or heat welding. Then, the entire structure is covered with a thick synthetic resin film 14 except for the drawer lead parts 9 and 10. Dating is a common method for this exterior packaging. In such a structure, since the frame 13 is made of synthetic resin, the wall thickness must be increased in order to secure mounting margins for the terminal plates 5 and 6 and to provide strength, resulting in a large shape. . In order to increase the degree of sealing, the synthetic resin layer 14 must be made thicker, requiring more man-hours and increasing the external size.

Therefore, the object of this invention is to provide a piezoelectric vibrating component structure that is reliable, compact, and cost-reduced.

The gist of this invention is a piezoelectric vibrating element having opposing electrodes, one divided case made of a high-strength, high-melting-point insulating material located on one principal plane side of the piezoelectric vibrating element, and one side of the divided case made of a high-strength, high-melting-point insulating material located on one principal plane side of the piezoelectric vibrating element; A pair of connection terminal electrodes are provided on the other side of the divided case made of high-strength, high-melting-point insulating material located at It is provided inside one side of the case, and is connected to one of the electrodes provided on the piezoelectric vibrating element, and is connected to one of the connection terminal electrodes provided on the other side of the split case via the sealing surface between the split cases. a first connection electrode connected to the first connection electrode, and a second connection electrode provided inside the other split case;
It has a second connection electrode connected to the other electrode provided on the piezoelectric vibrating element and connected to the other connection terminal electrode via the sealing surface of the divided cases, and the divided cases are sealed together. It is a chip-shaped piezoelectric vibrator made of

Examples of this invention will be described below with reference to the drawings.

15 is a split structure case, and partial case 16,
Consists of 17. The partial cases 16 and 17 are generally made of a high-strength, high-melting-point inorganic insulating material such as glass or ceramics. Depending on the use and purpose, a synthetic resin with high strength and excellent heat resistance, such as polyphenylene sulfide resin (PPS resin) or epoxy thermosetting resin, may be used. Connection terminal electrodes 18 and 19 are provided on a pair of opposing side surfaces of the partial case 17, respectively. Electrode 18
is electrically connected to an electrode 21 that passes through the sealing surface with the partial case 16 and extends to a protrusion 20 protruding from the inner bottom surface of the partial case 17. On the other hand, partial case 16
An electrode 22 is provided on the inner bottom surface of the electrode 2.
2 passes through the sealing surface with the partial case 17 and is electrically connected to the connection terminal electrode 19. The elastic member 23 is shaped like a metal rectangular plate with its apex at the center and protruding from one side, with the center portions of each side cut out, and has a protrusion 24 at the center. The partial cases 16 and 17 are fixed with a glass sealing material, a brazing material, or an adhesive depending on the material. When brazing, metalize the mating surfaces. In either case, the sealing is complete. The piezoelectric vibrating element 1 is housed in a case 15 and is clamped by protrusions 20 and 24. The electrode 4 of the piezoelectric vibrating element 1 is electrically connected to the connecting terminal electrode 18 via the electrode 21, and the electrode 3 of the piezoelectric vibrating element 1 is connected to the elastic member 2.
3. Conductive to the connection terminal electrode 19 via the electrode 22.

As is clear from the above embodiments, according to this invention, the split cases are sealed together to form a chip component, and a connecting terminal electrode for connection with the outside is formed on the side of one split case. This connection terminal electrode is drawn out to the side of the divided case via the sealing surface between the divided cases, so it is possible to create a chip-type piezoelectric vibrator with excellent sealing performance and excellent environmental resistance. It becomes possible to obtain. Moreover, since the connection terminal electrodes for connection with the outside are distributed on one pair of sides of the split case, when surface-mounted on a printed circuit board, etc.
Electrical connection with the outside can be made extremely easily. Therefore, it is possible to realize a chip-type piezoelectric vibrator suitable for surface mounting, and furthermore, since the structure is simple, automatic assembly is possible, mass production is possible, and costs are reduced.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the conventional example, and Figure 3 is
An exploded perspective view of one embodiment of this invention, FIG.
A partial perspective view and FIG. 5 are sectional views of the same. 1 is a piezoelectric vibrating element, 15 is a case, 16, 17
is a partial case.

Claims (1)

[Scope of Claim for Utility Model Registration] A piezoelectric vibrating element having opposing electrodes, one side of a split case made of a high-strength, high-melting-point insulating material located on one principal plane side of the piezoelectric vibrating element, and the other principal plane side of the piezoelectric vibrating element A pair of connection terminal electrodes are provided on the other side of the split case made of a high-strength, high-melting-point insulating material, and a pair of connection terminal electrodes are provided on the other side of the split case to connect with the outside. It is connected to one of the electrodes provided on the piezoelectric vibrating element, and is connected to the connecting terminal electrode provided on the other side of the split case via the sealing surface between the split cases. The first connecting electrode is provided inside the other divided case, and is connected to the other electrode provided on the piezoelectric vibrating element, and is connected to the other connecting terminal electrode via the sealing surface between the divided cases. A chip-shaped piezoelectric vibrator having a second connection electrode connected to the casing, and having divided cases sealed together.