JPS6192016A - piezoelectric vibrator - Google Patents

Abstract

PURPOSE:To attain ease and complete space forming in a resonance electrode and excellent characteristic by containing a piezoelectric element of a piezoelectric porcelain vibrator to be used as clock signal generation of one chip microcomputer and a lead terminal incorporated together into a glass tube or an insulation resin case. CONSTITUTION:Lead terminal 12, 13 are fixed and connected by conductive adhesives 14, 15 (or soldered) across a rectangular piezoelectric element 11. The piezoelectric element 11 and the leads terminals 12, 13 incorporated together are inserted into an insulation resin case 16 (or glass tube) so that the lead terminals 12, 13 are projected externally. A resin case 16 is formed so as to form a space 17 at both sides of a resonator electrode of the piezoelectric element 11 especially in the insertion state. Further, the conductor part between the lead terminals 12 and 13 of the piezoelectric element 11 and the lead terminals 12, 13 are supported at a seal part 18 of the resin case 16. It can be attained also by fitting externally the lead terminals 12, 13 across the piezoelectric element 11 to mutually conduct them.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a piezoelectric ceramic vibrator used, for example, for generating a clock signal for a one-chip microcomputer, which has been attracting attention recently.

Structure of the conventional example and its problems A conventional piezoelectric ceramic vibrator, not shown in FIGS. 4A and 4B, is composed of a rectangular piezoelectric element. In this piezoelectric element, a resonant electrode 2 and a conductive electrode 3 are formed on a piezoelectric ceramic 1 by vacuum evaporation, plating, or the like so that the resonant electrode 2 faces each other on the front and back sides. A piezoelectric ceramic vibrator as shown in FIG. 5 is assembled using this piezoelectric element.

In FIG. 5, both ends of the piezoelectric element 4 are fixed to copper foil portions 6a, 6b formed on a printed circuit board 5 with an electrically conductive adhesive or solder 7a, 7b. Qa.

8b is a lead terminal connected to the R8 foil portions 6a, 6b. 9 is an insulating buffer material that covers the piezoelectric element 4, the printed circuit board 5, etc., and 10 is an insulating resin that further covers the R member 9 from above. Here, mechanical thickness shear vibration occurs in the resonant electrode of the piezoelectric element 4 when a signal with a certain frequency is input, so when the insulating buffer material 9 is attached to the common membrane electrode, this mechanical thickness shear vibration occurs. Vibration is suppressed,
It loses its function as a camera element (see Figure 3B).

Conventionally, methods of forming a space using paraffin and a method of forming a space using thermal tape have been generally known as methods of creating a space in the resonant electrode part of a piezoelectric device, but due to manufacturing variations, etc., it is difficult to completely form a space. was difficult.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a piezoelectric ceramic sensor with excellent characteristics by facilitating and perfecting the space formation of a resonant electrode portion.

Structure of the Invention In order to achieve the above object, the piezoelectric ceramic vibrator of the present invention has the following features:
Lead terminals are held at both ends of a rectangular piezoelectric element with opposing resonant electrodes formed on the front and back sides using the thickness shear vibration of piezoelectric ceramics, and the piezoelectric element and lead terminal are integrated into a glass tube or insulating resin case. In this stored state, spaces are formed on both sides of the resonant electrode portion of the piezoelectric element, and the connection portion between the piezoelectric element and the lead terminal is fixedly supported by the glass tube or resin case.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings (FIGS. 1 to 3).

A first embodiment is shown in FIG. 1, and numeral 11 is a rectangular piezoelectric element similar to the piezoelectric element shown in FIG. It is firmly connected with adhesive 14.15 (or soldering).

The piezoelectric element 11 and lead terminals 12 and 13 are inserted into an insulating resin case 16 (or glass tube) so that the lead terminals 12 and 13 protrude outward. In this inserted state, the resin case 16 is molded so that spaces 17 are formed on both sides of the piezoelectric element 11, especially on both sides of the resonant electrode portion. Further, the conductive portion between the piezoelectric element 11 and the lead terminals 12.13 and the lead terminals 12.13 are supported by the sealing portion 1B of the resin case 16.

By the way, as in the second embodiment shown in FIG.
Lead terminals 12 and 13 may be fitted onto both ends of the lead terminal 10 to establish electrical conduction with each other. The other configurations are the same as in the first embodiment.

Effects of the Invention As described above, according to the present invention, a space can be easily and reliably formed in the resonant electrode portion, and a piezoelectric ceramic vibrator having the characteristics shown in FIG. 3A can be provided. Furthermore, by considering various shapes of lead terminals, it is possible to create multiple types of chips.

[Brief explanation of drawings]

1 and 2 are sectional views showing the first and second embodiments of the present invention, FIG. 3 is a characteristic diagram, FIG. 4A is a front view of a piezoelectric element, and FIG. 4B is a piezoelectric element in a state of FIG. 5 is a cross-sectional view of a conventional piezoelectric ceramic vibrator, which is a rear view of the element viewed upside down. 11...Piezoelectric element, 12.13...Lead terminal, 1
4.15... Conductive adhesive, 16... Resin case,
17...Space, 18...Sealing Department Agent Yoshihiro MorimotoFigure 1

Claims (1)

[Claims] 1. Utilizing the thickness shear vibration of piezoelectric ceramics, lead terminals are held at both ends of a rectangular piezoelectric element with opposing resonant electrodes formed on the front and back sides, and the piezoelectric element and lead terminal are integrated into a glass tube or insulating resin. A vibrating piezoelectric ceramic that is housed in a case, and in this housed state, spaces are formed on both sides of the resonant electrode part of the piezoelectric element, and the connection part between the piezoelectric cord and the lead terminal is fixedly supported by the glass tube or resin case. Child.