JPS6295012A - Piezo-resonator - Google Patents

Abstract

PURPOSE:To obtain a resonator which can be made small in size and has a stable electric characteristic, by providing a lead connecting space and a vibration allowable space through a bank part on the surface side of an inner case, and containing a piezo-resonator element in a state that it has been supported by the bank part of the inner case. CONSTITUTION:The titled piezo-resonator consists of an inner case 1 and an outer case 2. The inner case 1 is formed, for instance, by a resin molding, and on its surface side, lead connecting spaces A1-A4 and a vibration allowable space B are formed through bank parts 1a-1d. In A1-A4, and B, piezo- resonator elements 3, 4 are contained in a state that they have been supported by the bank parts 1a-1d, and the bank parts 1a-1d are provided projectingly in a position corresponding to the outside of a vibration area of the piezo- resonator elements 3, 4, therefore, support the piezo-resonator elements 3, 4 in a state that its vibration is not obstructed, and also prevent solder, etc. from overflowing to vibration allowable spaces B1, B2 from the lead connecting spaces A1-A4.

Description

[Detailed Description of the Invention] 3. Revision 8+U Explanation of the Invention First and foremost, the present invention relates to a piezoelectric device using, for example, a pair of energy confinement type piezoelectric resonator elements, and particularly to Regarding improvements to the mounting structure.

Conventionally, the piezoelectric board itself or the printed circuit board to which it is attached is dipped in resin, and the entire periphery of the piezoelectric board itself is dipped in a resin. The exterior resin is coated on.

Figure 8 shows a mounting structure in which the piezoelectric substrate a itself is covered with an exterior resin, and Figure 10 shows a mounting structure in which piezoelectric substrates al and a2 are attached to a printed circuit board C, and the board C is covered with an exterior resin. It shows. The piezoelectric substrate a of the resonator shown in FIG. 8 has a pair of electrodes di, d2, . . . on its two main surfaces, as shown in FIG. e
By forming the resonator l and e2 facing each other, the structure incorporates a pair of resonant elements) fl and [2, and the piezoelectric substrates al and a2 of the resonator shown in FIG. A single resonant element is constructed by forming electrodes partially facing each other on the amphibodi surfaces. Then, the two piezoelectric substrates al and a2 are placed in the first
As shown in Figure 1, each electrode is provided on a printed circuit board C with a conductive pattern g.

Connected to h and i by solder or conductive adhesive. In the above figure, j is a cavity or an elastic body such as silicone rubber for not inhibiting the vibration of the resonant element.

3 泗iJ"IA '7MARU IS YOYO!: tl A grip point By the way, any of the above-mentioned conventional means also has the following problems.

(2) In both cases, the exterior is formed by dipping into the resin, so the amount of exterior resin cannot be controlled, which limits miniaturization, and the dimensions of each resonator vary.

(2) Since the exterior resin comes into direct or indirect contact with the resonator element 1, stress due to hardening of the resin acts on the resonator element, adversely affecting its vibration mode and electrical characteristics.

■ Continuous production is difficult because it takes a long time for the exterior resin to harden.

An object of the present invention is to provide a piezoelectric resonator with a novel structure that eliminates such problems.

In order to achieve the above object, the piezoelectric resonator of the present invention is provided with a lead connection space and a vibration permissible space via a bank on the front side of the inner case. An energy trapping type piezoelectric resonator element, in which electrodes are formed partially facing each other on two main surfaces of a rectangular piezoelectric plate, is housed in the space while being supported by the bank, while the inner case A lead positioning part is formed on the back side of the lead, and 'J
- a lead is provided, and the tip of the lead breaks through the inner case and protrudes into the lead connection space on the front side, and is connected to the electrode of the piezoelectric resonant element in the space, and the inner case is entirely housed in the outer case. It is characterized in that it is sealed with a sealant.

Figure 1 is an overall external view showing an example of the piezoelectric resonator of the present invention;
FIG. 2 is a side sectional view. As shown in these figures, the piezoelectric resonator of the present invention consists of an inner case 1 and an outer case 2.

The inner case 1 is formed, for example, by resin molding, and the front side thereof has a lead' connection space A as shown in FIGS. 3 and 4.
l, A2. A3, A4 and the vibration permissible space B are the bank part 1a
, lb.

1c and 1d. The spaces A1 to A
4.8, as shown in Fig. 5, a piezoelectric resonator
3 and 4 are housed in a supported state on the banks 1a to 1d.

Since the bank portions 1a to 1d protrude at positions corresponding to outside the vibration region of the piezoelectric resonator elements 3.4, they support the piezoelectric resonator elements 3, 4 without inhibiting their vibrations, and also・Ushida etc. from 1 to A4 to the connection space are connected to the vibration permissible space B1. This prevents overflow to B2.

The piezoelectric resonator elements 3 and 4 are formed by forming electrodes 3b, 4b, . A confinement type is used.

As shown in FIG. 6, on the back side of the inner case 1, leads 8 to 10 are provided in grooves 5, 6.7 serving as lead positioning portions. The tips 8a-103 of each lead 8-10 break through the inner case 1 and protrude into the lead connection spaces A1-A4, and as shown in FIG. piezoelectric resonator element 3
, 4 electric wires 3b, 4b... and lead tips 8a to 10
a is connected.

Thus, piezoelectric resonator elements 3, 4 and leads 8-1
As shown in FIG. 2, the inner case 1 with the housing 0 attached is housed in an open outer case 2 made of, for example, Japanese cedar (Japanese cedar wood), with only the bottom open, and the inner case 1 is sealed with a sealant 12.

According to the above configuration, two piezoelectric resonator elements 3.4
One electrode is connected to the common glue part 8, and the other electrode is connected to each separate glue part 9, 10, so the equivalent circuit is the same as the conventional means shown in FIGS. 8 and 10. It is. Therefore, it can be used for applications such as piezoelectric traps.

However, structurally, it does not have to be mounted by dipping as in conventional means, so it brings about many effects.

In the illustrated example, the leads 8 to 10 protrude outward from the outer case 2, but they may be bent along the surface of the outer case 2 to form a so-called chip-type piezoelectric resonator. . Further, the assembly procedure of the above structure can be performed according to the order of explanation of the above structure.

Since the piezoelectric resonator of the present invention is constructed as described above, it is as follows.
It has a great effect.

■Since the external dimensions are determined by the outer case, there is no need to limit the size of each resonator, and by making the inner and outer cases smaller, the resonator can be made smaller.
There is no longer a limit to miniaturization as in the conventional means constructed by dipping the exterior resin, and further miniaturization can be expected.

■Since the piezoelectric resonator element is housed in a supported state on the bank of the inner case, it is no longer affected by stress caused by hardening of the resin, and provides good and stable electricity. Obtain a resonator with specific characteristics.

(2) Since no exterior resin is used, there is no need to take curing time into consideration, and therefore continuous production is possible.

[Brief explanation of drawings]

Fig. 1 is an external view of a piezoelectric resonator as an embodiment of the present invention, Fig. 2 is a side sectional view of the piezoelectric resonator, Fig. 3 is a perspective view of the inner case, and Fig. 4 is a front view of the inner case. Figure, Figure 5 is pressure?
a A front view of the inner case showing the state in which the resonator element is installed, FIG. 6 is a perspective view of the back side of the inner case, and FIG. 7 is a piezoelectric (
Diagram showing the state in which the dragon element and the lead are connected, No. 8
The figure is a side cross-sectional view of an example of a conventional piezoelectric resonator, FIG. 9 is a plan view showing a piezoelectric resonator element used in the resonator, and FIG. 10 is a conventional piezoelectric resonator. FIG. 11 is a side cross-sectional view showing another example of resonance A, and is a diagram showing a piezoelectric resonator Niremen 1- used in the resonator. 1... Inner case, la to 1d... Bank portion 2... Outer case, 3, 4... Piezoelectric resonator element 5.6.7
...Lead positioning section 8.9. 10...Leads 8a, 9a, 10a...Tip 12...Sealant, A1-A4...Lead connection space B
1. B2... Vibration permissible space Patent applicant Murata Manufacturing Co., Ltd. Figure 1 Figure 5 Figure 8 Figure 10

Claims (1)

[Claims] A lead connection space and a vibration tolerance space are provided on the front side of the inner case via a bank, and electrodes are formed in these spaces partially facing the two main surfaces of the rectangular piezoelectric plate. A confinement type piezoelectric resonator element is housed in a state where it is supported by the bank, and on the other hand, a lead positioning part is formed on the back side of the inner case, and the lead is provided in the positioning part, and the tip of the lead is connected to the inner case. and protrudes into the lead connection space on the front side, and is connected to the electrode of the piezoelectric resonant element in the space, and the inner case is entirely housed in the outer case and sealed with a sealant. Features a piezoelectric resonator.