JPS5994911A - Manufacture of composite type ceramic resonator - Google Patents

Abstract

PURPOSE:To attain the same external appearance and miniaturization by curing a resin while pressing and forming. CONSTITUTION:A piezoelectric element 7 where electrodes are formed on opposite faces except ends formed differently, a capacitor element 8 having three electrodes in total to parts except the center of one and the other face, and three input/output lead terminals 9 are arranged and they are connected electrically by wire bonding 10 or solder. Then, the surrounding of both said elements 7, 8 is covered by an elastic member 11 or a cover forming a space, and the surrounding including a part of the lead terminals 9 is covered by a resin 12, a metallic die 13 is contacted from the upper and lower sides, the resin 12 is cured while being formed pressingly to obtain a composite ceramic resonator.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a composite ceramic resonator that can function as a filter or an oscillator as a single component.

Conventional configuration and its problems In conventional ceramic resonators, in order to have the same shape, the first
As shown in the figure, a piezoelectric ceramic element 3 electrically connected to input/output lead terminals 2 for connection with the outside is placed in an exterior case 1, and After placing an elastic material 4 around the element 3 or providing a lid (not shown) to create a space around the ceramic element 3, the ceramic element 3 was sealed with a resin 6.

In this case, in order to prevent contact between the ceramic element 3 and the case 1, the shape of the case 1 becomes large, resulting in poor sealing performance. Further, when this is used as an oscillator, external capacitances C1 and C2 are required as shown in FIG. 3, which increases the number of circuit components. In FIG. 3, 6 is the ceramic resonator mentioned above, and IN is an external inverter.

Purpose of the Invention The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology. The aim is to provide a manufacturing method.

Structure of the Invention In order to achieve this object, the method for manufacturing a composite ceramic resonator of the present invention connects piezoelectric ceramic elements or piezoelectric ceramic elements and other electronic component elements via input/output lead terminals. They are connected to each other, wrapped around them with an elastic material or a lid that forms a space, and then covered with resin, and the resin is hardened while being pressure molded. According to this configuration, since the resin is cured while being pressure molded, it is easy to obtain a product with the same external shape, a high degree of sealing, and a small size. In the example used as , the number of circuit components can be reduced.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 to 7. As shown in FIG. 4, a piezoelectric ceramic element 7 in which electrodes are formed with different end portions left on the opposing surfaces, and a total of 3 electrodes on the central portion of one surface and the portion excluding the central portion of the other surface.
The arrangement of a capacitor element 8 having three electrodes and three input/output lead terminals 9 is shown in 1. Assemble this as shown in FIG. 6, and connect the piezoelectric ceramic element 7 and capacitor element 8 to input/output lead terminals 9 using wire bonding 10 or soldering.
This shows a state in which they are electrically connected via.

In this case, since the vibrating part of the ceramic element 7 is connected to the capacitor element 8 via the lead terminal 9, the vibration is not suppressed because the lead terminal 9 has a middle thickness. Next, as shown in FIG. 6, the periphery of the pixel elements 7 and 8 is wrapped with an elastic material 11 or a lid that forms a space, and then the periphery including a part of the lead terminal 9 is covered with a resin 12. The resin 12 is hardened while being covered with molds 13 from above and below and pressure molded, thereby obtaining a composite ceramic resonator as shown in FIG.

Figure 8 shows an example of an oscillator circuit using the composite ceramic resonator obtained in this way.
The dotted line portion including 2 is the ceramic resonator of the present invention, and IN is an external inverter.

Here, in the above embodiment, a case was explained in which the piezoelectric ceramic element and the capacitor element were electrically connected via lead terminals. The present invention can also be applied to combinations of other electronic component elements.

Effects of the Invention According to the method for manufacturing a composite ceramic resonator of the present invention configured as described above, since the resin is cured while being pressure-molded, products with the same external shape can be easily obtained, and the resonator can be sealed tightly. It has a high degree of strength and can be easily reduced in size. Also, from a circuit perspective, for example, a shape that includes capacitance can be obtained as a single component, which reduces the number of peripheral circuit components and also helps in reducing space.

[Brief explanation of drawings]

Figure 1 is a perspective view showing how to make a conventional ceramic resonator, Figure 2 is a partially cutaway front view of the finished product, and Figure 3 is a circuit diagram showing an example of an oscillation circuit using a conventional ceramic resonator. , FIG. 4 and FIG. 6 are perspective views of a six-page ceramic resonator, and FIG. 8 is a circuit diagram showing an example of an oscillation circuit to which the composite ceramic resonator of the present invention is applied. 7... Piezoelectric ceramic element, 8... Electronic component element (capacitor element), 9... Input/output lead terminal, 11... Elastic material, 12...・・・・・・
·resin. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 5

Claims (1)

[Claims] The piezoelectric ceramic elements or the piezoelectric ceramic elements and other electronic components are electrically connected via input/output lead terminals, wrapped around them with an elastic material or a lid that forms a space, and then covered with resin. A method for manufacturing a composite ceramic resonator, characterized in that the resin is covered and cured while being pressure molded.