JPS59205810A - Piezoelectric oscillator and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a stable oscillator by placing and fixing a piezoelectric plate applied with an exciting electrode on both major planes on a metallic terminal inserted and fixed to both ends of a cylindrical insulator, providing a metallic film to an outer side face near both ends of this insulator and sealing the insulator with cans. CONSTITUTION:Copper or the like is vapor-deposited on both ends and the outer side faces near both ends of the cylindrical insulator 3 made of glass or the like and further, the metallic film 4 of tin or solder plating or the like is applied thereto. The metallic terminal 7 inserted to both the ends of the insulator 3 is a cylinder having an outer diameter slightly smaller than the inner diameter of the insulator, its one end part is pushed into spread so as to be brought into close contact with the end part of the insulator 3 and they are fixed by an adhesives. The vicinity of both ends of a crystal plate 1 is fixed to the metallic terminal 7 by a conductive adhesives or solder 8, and the metal-made cans 9 are pressed from both ends of the insulator 3 thereby attaining airtightness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric vibrator using a rectangular piezoelectric plate and a method for manufacturing the same.

Conventionally, crystal oscillations have been widely used as a clock source for monitors and the like. FIG. 1 shows a rectangular crystal diaphragm that has already been widely used, and excitation electrodes 2 are arranged on both main surfaces. Since rectangular crystal oscillators are small, they are used as signal sources for electronic equipment by taking advantage of this advantage.

However, although they are made into chips to fit other electronic components or boards, lead wire type crystal resonators are the mainstream.

Figure 2 shows a chip-type crystal resonator that has already been announced. A metal film 4 is formed by plating or the like near both ends (=f) of a cylindrical insulator 3 such as glass. Then, an excitation electrode 2
The quartz plate 1 subjected to this process is placed directly on the metal film 4 and fixed with a conductive adhesive, solder 5, or the like. Further, metal cans 6 are press-fitted into both ends of the insulator to create an airtight structure. Note that the drawer part also serves as a sealing pad.

However, such a vibrator has the following drawbacks.

(a> Since the crystal plate is placed directly on the insulator on the cylinder, the longitudinal side of the crystal plate comes into contact with the inner wall of the insulator,
The series resonant resistance of the vibrator deteriorates.

(])) A metal film is formed on the inner wall of the insulator by vapor deposition or plating.
:, (This may occur if there is an electrical short circuit.)

In the present invention, metal terminals are inserted and fixed at both ends of a cylindrical insulator.
゛1, 1: Real metal! 5. □ On the 2i rectifier j-, j) j) 4 oscillating electrodes are placed on both Eih surfaces of 1+, the electric plate is placed firmly on both ends of the insulator, and the metal 1 is installed on the side of the insulator. To Kan, more! t J, I piezoelectricity whose main composition is soil]
This is a oscillator and its manufacturing method. 1) The purpose is to eliminate defects and provide a stable oscillator.

FIG. 3 is a perspective view showing an embodiment of the present invention.

1■J 1iii-shaped and crow 6- Both ends of the insulator 3 and both ends ζ1
is alms. However, as shown in FIG. 2, it is not necessary to insulate the inner wall of the cylindrical insulator 3. Next, metal terminals 7 are inserted from both ends of the insulator 3. metal terminal 7
is a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the insulator 3], and one of the!・Envy) 1: is expanded and goes to insulator 3 “Wt
Jlj is machined so that it fits closely with the part. This metal terminal 7 is connected to the insulation body 3. At this time, the adhesive will stick.

FIG. 11 shows the metal Δ1::child 7 (
, Zh3) The crystal plate 1 provided with the one-wave electrode 2 is shown mounted. There is conductive adhesive near both ends of the crystal plate.
・It is fixed. Next, the metal nonon 9
are press-fitted from both ends 81 of the insulator 3 to create an airtight state.

J2 is sealed to the gold FA film 1 provided on the insulator 3 and the insulator 3. The can 9 is plated or coated with a metal suitable for press-fitting, for example, IX render. FIG. 5 shows a half-sectional view of the 11-layered state. Kang 9 is just a draw 1
” is used as a terminal. The internal atmosphere is either vacuum or filled with nitrogen gas. The upper gold 10,000 terminal is
One end of the cylindrical metal tube is pushed out and brought into close contact with the end of the insulator, and the ridge connected to the saw metal membrane provided at the end of the insulator transmits electrical signals from the diaphragm to the can.

Other embodiments of the invention are shown in FIGS. 6 and 7.

FIG. 6(a) shows a metal terminal 11 with a notch made at the point where it contacts the end of the insulator of the metal terminal 7 described above.
It has a structure that partially floats above the insulator. 1st a(b>
As shown in FIG. 2, the notch in the metal terminal 11 brings it into direct contact with the metal terminal upper ring 9, so that the metal film 10 of the insulator 3 does not need to be provided at the end of the insulator 3. ′! In Figure iS7 (a), the tip of the metal terminal 12 is machined into a funnel shape, and the can 9 and the adhesive 1 are connected. That's what I do. An assembled example is shown in FIG. 6(b). 1st: At the metal terminals 11 and 12 shown in Fig. 7, the metal terminals are attached to the ends of the insulator 3)
There is no longer any need to imitate it.

As shown in FIG. 8, as an example of the pond, solder or the like 13 is heaped up on the expanded portion of the metal terminal, but particles such as hang are applied. This ensures reliable contact between the metal terminal and the can.

The present invention provides the following effects.

(Warning 1) Since the 41111 plane of the diaphragm is separated from the insulator by the metal terminal, there is no risk of contact with the insulator, and i
+jj column 11 resistor becomes low and stable oscillation can be obtained.

<1)) Since iπ, was it necessary to apply a metal film to the inside wall of the insulator? If the metal film is applied to the end face of the insulator and the end face of the insulator by a metal terminal, there is no need to worry about short circuits on the inside wall of the insulator. Kana has become.

(c) *: By devising the metal terminal, the metal I
It is no longer necessary to apply IA to the ends of the insulator.

According to the present invention, the yield is improved and it is possible to manufacture inexpensive and stable piezoelectric vibrators.

In this example, in addition to using crystal as the piezoelectric material,
Lithium tantalate, sulfur difluoride, or piezoelectric ceramics may also be used. Further, although glass is used as an example of the insulator, crystal, ceramic, etc. may also be used. Furthermore, the metal 1 may be coated with a combination of vapor deposition, plating, or conductive coating AI.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a piezoelectric plate used in the invention,
Fig. 2 is a perspective view showing a conventional piezoelectric vibrator, and Fig. 3 is a perspective view showing a conventional piezoelectric vibrator.
FIG. 4 is a JSI perspective view showing a state in which the metal terminal of the present invention is inserted, FIG. It is a sectional view showing an assembled internal structure number. FIG. 6(a) shows another embodiment of the present invention. Metal end j
-1 Figure <b> is a partial sectional view showing the inside when the metal terminal of Figure (a) is used in a piezoelectric vibrator. Figure 7 (
1]) is the metal terminal of another example, and the same figure (b) is the part 1 showing the inside of the intestine using the metal terminal of 1゛
111 and 1-i1. FIG. 8 is a diagram of a portion 1111i showing another embodiment. 1...Piezoelectric plate 2...Excitation electrode ((...--Insulator 4, 10...Metal film 7, Il, 12...Metal terminal 9...
...] Il 5th m

Claims (2)

[Claims] (1) Metal terminals are inserted and fixed at both ends of a cylindrical insulator, a piezoelectric plate with excitation electrodes on both main surfaces is placed and fixed on the metal terminals, and the ends of the insulator are placed near A piezoelectric vibrator characterized by being sealed with a metal film and a can provided on the side. (2) A step of arranging metal terminals at both ends of a cylindrical insulator, a step of placing and fixing a piezoelectric plate having excitation electrodes on both main surfaces on the metal terminal, and a step of placing metal terminals on both ends of the insulator. ii) A method for manufacturing a piezoelectric vibrator according to claim 1, which comprises a step of performing Jd-J- (by means of a metal film provided on the outer surface of the vibrator and a can).