JPH06283953A - Manufacture of piezoelectric resonance component - Google Patents

Abstract

PURPOSE:To prevent mis-sorting from occurring by enabling the characteristic of a piezoelectric element itself to be accurately measured without receiving the influence of a load capacitor after a load capacitor built-in type piezoelectric resonance component is assembled. CONSTITUTION:The piezoelectric resonance component is assembled in a state where an insulating material 12 is arranged between input/output terminals 9a, 9b mounted on the piezoelectric element 4 and the capacitance electrodes 6a, 6b of a capacitance element 8, and after the electrical characteristic of the component is measured, the insulating material 12 is eliminated, thereby, electrical continuity between the input/output terminals 9a, 9b and the capacitance electrodes 6a, 6b can be atained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric resonance component, and more particularly, to a method for manufacturing a load resonance built-in piezoelectric resonance component used in a piezoelectric filter or the like.

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
FIG. 3 is a perspective view showing a general piezoelectric resonance component having a built-in load capacitance. In this piezoelectric resonance component, vibrating electrodes 2a and 2b are provided on both main surfaces of the piezoelectric substrate 1, and an extracting electrode 3 is provided from the vibrating electrodes 2a and 2b to an end portion of the piezoelectric substrate 1.
A piezoelectric element 4 obtained by drawing a and 3b is used, and input / output terminals 9a and 9b are attached to the piezoelectric element 4.

The piezoelectric element 4 has a dielectric substrate 5
A pair of capacitive electrodes 6a for forming a load capacitance on one main surface,
A capacitor element 8 having 6b and a counter electrode 7 on the other main surface is arranged (bonded) so that the surfaces on which the capacitance electrodes 6a and 6b are formed face each other (piecing). The extraction electrodes 3a and 3b of the element 4 and the capacitance electrodes 6a and 6b of the capacitor element 8 are electrically connected via the input / output terminals 9a and 9b. A ground terminal 10 is connected to the counter electrode 7 of the capacitor element 8.

A piezoelectric resonance component as shown in FIG. 5 is formed by covering the whole with the exterior resin 11 while ensuring a vibration space in the vicinity of the vibrating portion of the piezoelectric element 4.
The piezoelectric resonance component is a load resonance built-in type piezoelectric resonance component as described above, and has a circuit configuration as shown in FIG.

By the way, in the case of measuring the electrical characteristics of the piezoelectric element in the above-described load capacitance built-in type piezoelectric resonance component, for example, a four-terminal pair measurement using an impedance analyzer or a transmission method using a network analyzer is used. A measuring method or the like is used.

However, in these measuring methods, when the capacitance of the piezoelectric element 4 shown in FIG. 4 and the first and second load capacitances C ₁ and C ₂ forming the Colpitts type circuit become large,
Since the electric characteristics of the piezoelectric element 4 are affected by it, there is a problem that the original electric characteristics of the piezoelectric element 4 cannot be accurately measured. Further, if the electrical characteristics of the piezoelectric element cannot be accurately measured, there is a problem that a selection error (misselection) occurs in the step of selecting the characteristics.

The present invention solves the above-mentioned problems, and after assembling (manufacturing) a piezoelectric resonance component having a built-in load capacitance, the electric characteristics of the piezoelectric element itself are not affected by the load capacitance. It is an object of the present invention to provide a method of manufacturing a piezoelectric resonance component capable of accurately measuring

[0008]

In order to achieve the above object, a method of manufacturing a piezoelectric resonance component according to the present invention provides a vibrating electrode on both main surfaces of a piezoelectric substrate, and a drawer which is electrically connected to the vibrating electrode. An input / output terminal is attached to a piezoelectric element provided with an electrode so as to be electrically connected to the extraction electrode, and the first and second load capacitances are attached to the piezoelectric element on one main surface of the dielectric substrate. By arranging a capacitor element having a pair of capacitance electrodes for forming and a counter electrode on the other main surface so that the surfaces on which the capacitance electrodes are formed face each other, the input / output A method for manufacturing a piezoelectric resonance component having a built-in load capacitance, which comprises electrically connecting a terminal and a capacitance electrode of a capacitor element, wherein an input / output terminal attached to the piezoelectric element and a capacitance electrode of the capacitor element are provided. Insulation material provided Assembling the piezoelectric resonator component in the state,
After the electrical characteristics are measured, the insulating material is removed to electrically connect the input / output terminal and the capacitance electrode.

[0009]

Since the piezoelectric resonance component is assembled with the insulating material disposed between the input / output terminals attached to the piezoelectric element and the capacitive electrode of the capacitor element, the piezoelectric element is not assembled in the completed product. And a first and a second load capacitance forming the Colpitts type circuit are electrically insulated from each other. Therefore, the electrical characteristics of the piezoelectric element itself can be accurately measured without being affected by the load capacitance.

Further, by removing the insulating material after measuring the electric characteristics, the input / output terminals and the capacitance electrodes are electrically connected, and the piezoelectric resonance component functions as a piezoelectric resonance component incorporating a load capacitance. Demonstrate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a state before measuring electrical characteristics of a piezoelectric resonance component manufactured by a method according to an embodiment of the present invention.

The overall structure of the piezoelectric resonance component is the same as the piezoelectric resonance component shown in the above description of the conventional example (FIG. 5).
Since the structure is the same as that of 1., the description of the detailed structure of the piezoelectric resonance component will be omitted with reference to the description of the corresponding part, and the description will focus on the characteristic part of the invention.

In this embodiment, as shown in FIG. 1, the contact portions between the capacitance electrodes 6a and 6b of the capacitor element 8 and the input / output terminals 9a and 9b are melted at a temperature of 180 ° C. or higher to form an exterior resin. An insulating material 12 such as wax that is absorbed is applied. Further, the input / output terminals 9a, 9
b between the piezoelectric element extraction electrodes 3a and 3b.
The solder 13 is arranged so that it starts to flow at 0 ° C. or higher. Then, the entire part of the input / output terminals 9a and 9b except the part is covered with the exterior resin 11 to form a piezoelectric resonance component as shown in FIG. The piezoelectric resonance component has a circuit configuration as shown in FIG.

As shown in FIG. 2, in this piezoelectric resonance component, since the input / output terminal 9a and the ground terminal 10 and the input / output terminal 9b and the ground terminal 10 are insulated by the insulating material 12, When measuring the electrical characteristics between the output terminals 9a and 9b, the load capacitances C ₁ and C ₂ do not affect the electrical characteristics of the piezoelectric element 4.

Therefore, for example, the load capacitance C is measured by a four-terminal pair measurement using an impedance analyzer or a transmission method using a network analyzer.
The electrical characteristics of the piezoelectric element 4 can be accurately measured without being affected by ₁ and C ₂ .

After measuring the electrical characteristics of the piezoelectric element 4, the insulating material 12 can be absorbed and removed by the exterior resin 11 by heating the piezoelectric resonance component to 180 ° C. or higher. At this time, the input / output terminals 9a, 9
b between the lead-out electrodes 3a and 3b of the piezoelectric element 4
3 melts and, as shown in FIG. 3, insulating material 12 (FIG. 1)
Flows into the space after being melted and removed, and the capacitance electrodes 6a and 6b of the capacitor element 8 are electrically connected to the input / output terminals 9a and 9b. As a result, the circuit configuration of the piezoelectric resonance component becomes as shown in FIG. 4, and the piezoelectric resonance component having the built-in load capacitance exhibits its original function.

In the above embodiment, the case where the insulating material 12 which is absorbed and removed by the exterior resin 11 by heating to 180 ° C. and the solder 13 which melts and flows at 180 ° C. are used is described. The material and the solder are not limited to those having the above-mentioned characteristics, and it is possible to use those having different characteristics in consideration of the characteristics and applications of the piezoelectric resonance component.

In the above embodiment, the insulating material 1
The case where the melted solder 13 flows into the space after the 2 is melted and removed and the capacitance electrodes 6a and 6b of the capacitor element 8 and the input / output terminals 9a and 9b are electrically connected has been described. For example, after the insulating material is melted and removed, the input / output terminals 9a, 9a,
It is also possible to make 9b contact (connect) with the capacitance electrodes 6a and 6b of the capacitor element 8.

The present invention is not limited to the above embodiment in other respects, and the structure of the piezoelectric element, the type of vibration mode, the structure of the capacitor element, and the specific shapes of the input / output terminal and the ground terminal. With respect to the above, various applications and modifications can be added within the scope of the present invention.

[0020]

As described above, according to the method of manufacturing the piezoelectric resonance component of the present invention, the piezoelectric material is disposed between the input / output terminals attached to the piezoelectric element and the capacitance electrode of the capacitor element. After the resonant parts are assembled and the electrical characteristics are measured, the insulating material is removed so that the input / output terminals and the capacitance electrodes are electrically connected. Therefore, the piezoelectric element itself is not affected by the load capacitance. It becomes possible to accurately measure the electrical characteristics of the.

Further, by removing the insulating material after measuring the electric characteristics, it is possible to easily exhibit the original function of the piezoelectric resonance component having a predetermined load capacitance.

Therefore, according to the present invention, after the piezoelectric resonance component having the built-in load capacitance is assembled, the characteristics of the piezoelectric element itself can be accurately measured without being affected by the load capacitance. It becomes possible to prevent erroneous selection and improve the selection reliability.

[Brief description of drawings]

FIG. 1 is a plan view showing a state before measuring electrical characteristics of a piezoelectric resonance component assembled by a method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of the piezoelectric resonance component of FIG.

FIG. 3 is a plan view showing a state where the insulating material is removed after measuring the electrical characteristics of the piezoelectric resonance component assembled by the method according to the embodiment of the present invention.

FIG. 4 is a diagram showing a circuit configuration of a piezoelectric resonance component having a built-in load capacitance in FIG.

FIG. 5 is a perspective view showing a conventional piezoelectric resonance component having a built-in load capacitance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric substrate 2a, 2b Vibrating electrode 3a, 3b Extraction electrode 4 Piezoelectric element 5 Dielectric substrate 6a, 6b Capacitance electrode 7 Counter electrode 8 Capacitor element 9a, 9b Input / output terminal 10 Earth electrode 11 Exterior resin 12 Insulation material 13 Solder

Claims (1)

[Claims] 1. A piezoelectric element having vibrating electrodes provided on both main surfaces of a piezoelectric substrate and lead electrodes that are electrically connected to the vibrating electrodes, and an input / output terminal that is electrically connected to the lead electrodes. Along with the mounting, the piezoelectric element is provided with a pair of capacitance electrodes for forming the first and second load capacitances on one main surface of the dielectric substrate and the opposite electrode is provided on the other main surface. Of a capacitor element with a built-in load capacitance, by arranging the capacitor element with the surfaces on which the capacitance electrodes are formed facing each other to electrically connect the input / output terminals and the capacitance electrode of the capacitor element. A method, wherein a piezoelectric resonance component is assembled in a state in which an insulating material is arranged between the input / output terminal attached to the piezoelectric element and the capacitive electrode of the capacitor element, and after measuring the electrical characteristics, Excludes the insulating material It allows the production method of the piezoelectric resonance component for causing conduction between the capacitor electrode and the output terminal to.