JPH0369443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composite element composed of, for example, a piezoelectric ceramic resonator and a capacitor. The present invention relates to a composite element constructed by combining a capacitor with one or more capacitors.

Conventional technology Oscillation elements and capacitor elements used in Colpitts oscillation circuits and demodulation circuits of FM signal receivers, etc.
Conventionally, they were supplied as separate elements from component manufacturers. Therefore, a so-called set maker assembled these elements to construct a desired circuit. Therefore, if a component manufacturer makes an element that is integrally formed by combining a resonant element and a capacitor element, it will save the assembly manufacturer the trouble of assembling the elements, and the resulting circuit itself can be made smaller. It will be possible to achieve this goal.

Based on the above idea, the applicant of the present application has already proposed a composite type device shown in FIGS. 7 and 8.

FIG. 7 is a perspective view showing the base 1 used in the previously proposed composite type element. The base 1 is made of resin, for example, and has an H-shaped front view with recesses 2 and 3 formed on the top and bottom. base 1
has three insert-molded leads 4
a, 4b, 4c, each lead 4a, 4
The forward portions of b and 4c are exposed on the surfaces of the recesses 2 and 3 of the base 1, and the rear portions thereof protrude toward the rear of the base 1. A resonator element 5 and a capacitor element 6, which will be described later, are mounted in the upper and lower recesses 2 and 3 of the base 1, respectively.

FIG. 8 is a sectional view from the front of a conventional composite element in which a resonator element 5 and a capacitor element 6 are mounted on the base 1 described above.
As shown in FIG. 8, the upper recess 2 of the base 1
A resonator element 5 is attached to the lower recess 3, and a capacitor element 6 is attached to the lower recess 3. The resonator element 5 has both ends mechanically coupled to the base 1 with a conductive paste 7, and an electrode 8a formed on the main surface of the resonator element 5.
and 8c are electrically connected to leads 4a and 4c, respectively. Furthermore, the central portion of the resonator element 5, which generates vibrations, is placed in a floating state with respect to the base 1, so that the vibrations are not disturbed. Capacitor element 6
is mechanically connected to the base 1 by conductive paste 7 at both ends and the center thereof, and has three electrodes 9a,
9b and 9c are electrically connected to leads 4a, 4b and 4c, respectively.

Problems to be Solved by the Invention However, it has been found that the previously proposed composite type device configured as described above has the following drawbacks. The reason is that the base 1 is made by insert molding the leads 4a, 4b, and 4c, which requires time and effort to manufacture, and increases the component cost of the base 1. In order to attach element 6, it is necessary to connect a total of five places with conductive paste 7, and there are many joints.Furthermore, when each element 5, 6 is joined to base 1 with conductive paste 7, as shown in Fig. 9. In the connection shown in A, there is a risk that the element 5 or 6 will come off the base 1 due to a falling impact or the like. Therefore, in order to ensure the reliability of the completed composite device, it is necessary to ensure that the conductive paste 7 sufficiently covers the ends of the elements 5 and 6, as shown in FIG. 9B. The conductive paste 7 has to be applied twice, and in addition, the two elements 5 and 6 are attached to both sides of the base 1, that is, the upper recess 2 and the lower recess 3 of the base 1. The manufacturing method must be such that one element is installed first, followed by the remaining elements. Therefore, it takes time and effort to manufacture it, and, in addition to the above reasons, it is difficult to use it on an automatic assembly line.

Means for Solving the Problems The present invention has been made to eliminate the drawbacks of the previously proposed conventional elements, and has the following configuration.

The composite element of the present invention includes an energy confinement type two-terminal resonator element, a capacitor element in which two or more electrodes are formed on one main surface, and a counter electrode formed on the other main surface, and both elements. and a base on which it is placed. The base has a through hole, and three leads are inserted into the through hole so as to protrude from both sides of the base.
In addition, the base has a shape that creates an air space between the vibrating part of the resonator element and the mounting surface when the resonator element is mounted, so as not to disturb the vibrations generated in the mounted resonator element. It is being On such a base, the resonator element and the capacitor element are electrically connected to predetermined ones of the three leads, and their main surfaces face each other and are approximately parallel to the mounting surface of the base. They are placed upright in perpendicular directions.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a composite element 1 according to an embodiment of the present invention.
FIG. The composite element 10 has a base 1
and resonator element 5 and capacitor element 6
and three leads 4a, 4b, and 4c.

FIG. 2 is a perspective view of the resonator element 5 used in the composite element 10. The resonator element 5 is a two-terminal element, and has electrodes 8 on two main surfaces of a rectangular piezoelectric ceramic substrate 11.
This is a configuration in which a and 8b are formed. Each electrode 8a,
8b is formed about two thirds in the length direction of the ceramic substrate 11 from different ends of each main surface of the ceramic substrate 11. Therefore, both electrodes 8a, 8b
is the longitudinal center portion 12 of the ceramic substrate 11.
The central facing portion 12 is where vibrations occur.

FIG. 3 is a perspective view of the capacitor element 6 used in the composite element 10. Like the resonator element 5, the capacitor element 6 also includes a rectangular unpolarized ceramic substrate 13. An electrode 9b is formed on one main surface of the ceramic substrate 13, and an electrode 9b is formed on the other main surface, extending from both ends of the substrate 13 toward the longitudinal center. Two electrodes 9a and 9b are formed. Then, an electrode 9b on one main surface and two electrodes 9 on the other main surface.
a and 9b are opposed to each other with a portion of each sandwiching the substrate 13 between them. Therefore, this element 6
This means that two capacitors are formed.

FIG. 4 is a perspective view of the base 1 used in the composite element 10, and FIG. 5 is a plan view thereof. The base 1 will be explained with reference to FIGS. 4 and 5. The base 1 is integrally molded with resin, for example, and has a horizontally positioned bottom 14.
and U-shaped planar side walls 15 and 16 that protrude vertically upward from both left and right ends of the bottom portion 14. Two protrusions 18 and 19 are formed on the upper surface 17 of the bottom portion 14 on both left and right sides away from the central portion in the longitudinal direction, and extend perpendicularly to the longitudinal direction.
The protrusions 18 and 19 are for floating the center opposing portion 12 of the resonator element 5 placed on the upper surface 17 with respect to the upper surface 17. Therefore, in this embodiment, the protrusions 18 and 19 extend from the upper end to the lower end of the upper surface 17.
8 and 19 need only be formed at least in the mounting portion of the resonator element 5, and their length can also be about half of the length shown in FIG.

The bottom part 14 of the base 1 has three through holes 20 arranged in a straight line along its longitudinal center line.
a, 20b, and 20c are formed. These through holes 20a, 20b, 20c have leads 4a, 4, respectively, as shown in FIG.
b, 4c are inserted.

FIG. 6 is a front view showing these leads 4a, 4b, and 4c. The leads 4a, 4b, and 4c are connected by a common frame 21 for convenience of processing. Note that in this common frame 21, the leads 4a, 4b, 4c are connected to the through holes 20 of the base 1.
a, 20b, 20c, each element 5, 6 is attached, and is cut out at a necessary time after the element 10 is completed. each lead 4
The tips of a, 4b, and 4c are inserted from below into through holes 20a, 20b, and 20c formed in the bottom 14 of the base 1, and protrude upward by a predetermined length from the top surface 17 of the bottom 14. For this reason, each lead 4
A, 4b, 4c have stopper pieces 22a, 22b, 22c at the portions that hang down from the tips by a predetermined length.
It is formed by protruding from the left and right.

Now, returning to FIG. 1, the description of the composite type device 10 according to one embodiment of the present invention will be continued. The resonator element 5 and the capacitor element 6 are arranged such that one of their main surfaces faces each other, and the base 1
The element is placed upright on the base 1 so that the main surface of each element is perpendicular to the bottom upper surface 17 of the element. Further, at this time, the tips of the leads 4a and 4c inserted from below the base 1 are sandwiched between the resonator element 5 and the capacitor element 6, and the tip of the lead 4b is bent along the bottom upper surface 17. , located below the capacitor element 6. It should be noted that since the leading end of the middle lead 4b is bent, it is possible to prevent the lead 4 from coming off or shifting the insertion state of the lead 4 during assembly. Each element 5, 6 and lead 4 are then joined to the base 1 with conductive paste 7. That is, the left ends of the resonator element 5 and the capacitor element 6 and the tips of the leads 4a held between both elements are electrically and mechanically integrally joined to the base 1 with the conductive paste 7. In this case, the left ends of both elements 5 and 6 and the tip of the sandwiched lead 4a are surrounded by the planar U-shaped side wall 15, so the side wall 1
By pouring the conductive paste 7 into the area surrounded by 5, the two elements 5 and 6 and the lead 4a can be reliably joined to the base 1.

The base 1 and the tip of the lead 4c held between the right end and both ends of the resonator element 5 and the capacitor element 6 are joined in the same manner. Furthermore, the bent tip of the lead 4b and the electrode 9 of the capacitor element 6
b is also electrically and mechanically bonded using conductive paste 7. Therefore, lead 4a or lead 4c serves as a hot-side input terminal or output terminal, and lead 4b serves as a ground-side terminal.

In addition, in this Embodiment 10, the side wall 1 of the base 1
Although the side walls 5 and 16 are U-shaped in plan, they are not limited to this, and may be I-shaped in plan. Furthermore, the base 1 may have no side walls.

Furthermore, in the above-described embodiment, the resonator element 5 and the capacitor element 6 cause the lead 4 to
Although the arrangement is such that a and 4c are sandwiched between them, other arrangements may be used. That is, the positions of the through holes 20a, 20b, 20c formed in the base 1 are
The lead 4 may be shifted upward or downward in the plan view so that the lead 4 is located below (outside) the capacitor element 6, for example, instead of between the two elements.

In addition, the composite device 1 completed in this way
0 is generally further covered with an outer case and supplied to a set manufacturer or the like.

Effects and effects of the invention This invention has the following excellent effects.

There is no need to insert mold the lead into the base, and the cost of parts for the base can be kept low.

When attaching the resonator element and capacitor element to the base, these elements are placed facing each other and upright in a direction approximately perpendicular to the mounting surface of the base, so that the three leads are A total of three locations need only be joined using conductive paste or the like, and compared to conventional products, the work associated with joining can be made more efficient, and the product can be manufactured easily and at low cost.

Since the resonator element and the capacitor element are mounted together on a common mounting surface of the base, it is easy to automate the assembly.

When bonding the base to the resonator element and capacitor element, the entire ends of both elements can be securely and sufficiently bonded to the base with conductive paste, etc., so that these elements can be easily bonded to the base due to a drop impact, etc. There is no fear that the device will come off, and the device can be highly reliable.

Further, the mounting surface of the base is shaped so that the vibrating portion of the resonator element is suspended. Therefore, unlike conventional products, there is no need to apply conductive paste to a predetermined thickness to float the resonator element, and there is no need to worry about the vibrating part of the resonator element coming into contact with the base depending on how the conductive paste is applied. Nor.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a perspective view of a resonator element used in one embodiment of the present invention. Figure 3 shows
FIG. 2 is a perspective view of a capacitor element used in one embodiment of the present invention. FIG. 4 is a perspective view of a base used in one embodiment of the present invention. Fifth
The figure is a plan view of the base of FIG. 4. FIG. 6 is a front view of a lead used in one embodiment of the present invention. FIG. 7 is a perspective view of a base used in a conventional composite element. FIG. 8 is a sectional view of a conventional composite element viewed from the front. FIG. 9 is a diagram for explaining a method of bonding conductive paste in a conventional element. In the figure, 1 is a base, 4a, 4b, 4c are leads, 5 is a resonator element, 6 is a capacitor element, 7 is a conductive paste, 10 is a composite ceramic element, 17 is an upper surface as a mounting surface, 20
a, 20b, and 20c indicate through holes.

Claims (1)

[Scope of Claims] 1. An energy confinement type two-terminal resonator element, a capacitor element having two or more electrodes formed on one main surface and a counter electrode formed on the other main surface, and both of the above elements are mounted. the base has a through hole, the through hole has a
Three leads are inserted through the base so as to protrude from both sides of the base, and the resonator element is placed on the base so as not to interfere with the vibration generated in the resonator element. The element has a shape that creates an air space between the vibrating part and the mounting surface, and both of the elements are electrically connected to predetermined ones of the three leads, and their main surfaces are electrically connected to predetermined ones of the three leads. are placed facing each other and standing upright in a direction substantially perpendicular to the placement surface of the base,
Composite element. 2. The composite element according to claim 1, wherein both of the elements are placed across a predetermined lead among the three leads protruding from the placement surface.