JPH11195945A - Manufacture of crystal vibrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent performance deterioration of the crystal vibrator by simplifying the crystal chip adhesion process. SOLUTION: A crystal chip 1 with an electrode 2 on its front and rear sides is fixed to a crystal chip fixing section 6 of a base for airtight terminals from which pluralities of leads 4 are extended to ensure the continuity between the leads 4 and the electrodes 2. The manufacturing method has a 1st process where an insulating adhesive 7 is applied to the crystal chip fixing section 6 of the base, and a conductive adhesive 9 is applied to a continuity connection section 8 of the leads 4 and the electrodes 2, and a 2nd process where the crystal chip 1 is positioned to the leads 4, the base and the crystal chip 1 are fixed by the insulating adhesive 7 and the continuity of the leads 4 and the electrodes 2 is ensured by the conductive adhesive 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a crystal resonator.

[0002]

2. Description of the Related Art FIG. 1 is an internal view of a typical quartz resonator, and FIG. 2 is a process chart for explaining a method of manufacturing the same. 3 and 4 are internal views of crystal units having different support structures. In the crystal unit, a crystal blank 1 having electrodes 2 formed on the front and back sides of a base 5 of an airtight terminal 3 having two leads 4 penetrated is fixed to a crystal blank fixing portion 6 of the base 5. Then, it is manufactured through a step of ensuring conduction between the lead 4 and the electrode 2.

Conventionally, a method using an adhesive has been known as a means for securing the adhesion and conduction, and the following method has been adopted. (First example of the prior art) Pre-process → Insulating adhesive 7 is applied to crystal blank fixing portion 6 of base 5 (FIG. 2 b) → Crystal blank 1 is mounted (FIG. 2 c) → Insulating adhesive 7 is cured and crystal is hardened The piece 1 is fixed to the base 5 → A conductive adhesive 9 is applied to the conductive connection 8 between the lead 4 and the electrode 2 (FIG. 2).
d) → The conductive adhesive 9 is hardened to ensure conduction between the lead 4 and the electrode 2 → The subsequent steps are performed. The same manufacturing process is applied to the support structure of the crystal unit shown in FIGS.

[0004] Japanese Patent Application Laid-Open No. 5-308237 discloses a method for securing and conducting by using an ultraviolet curing adhesive. (Second example of prior art) Pre-process → Apply UV-curable conductive adhesive to conductive connection portion 8 of lead 4 to electrode 2 → Install crystal blank 1 → Harden UV-curable conductive adhesive and crystal blank 1 is temporarily fixed to the lead 4 and conduction between the lead 4 and the electrode 2 is secured. → An ultraviolet-curable insulating adhesive is applied to the crystal blank 1 and the lead 4 → The ultraviolet-curable insulating adhesive is cured. To fix the crystal blank 1 through a post-process. The second example of the prior art is not employed in the present invention due to the fact that if the filler contained in the ultraviolet-curable conductive adhesive is large, ultraviolet rays cannot be irradiated to the inside, and the strength of the ultraviolet-curable insulating adhesive is weak. .

[0005]

The method of manufacturing a quartz resonator according to the first prior art has the following drawbacks.

In order to secure adhesion and conduction by the conventional technique, an adhesive application step and an adhesive curing step are required twice each. For this reason, the process of securing adhesion and conduction is long, and the electrode film is deteriorated, which affects various characteristics of the vibrator. When a thermosetting adhesive is used, curing requires a long time at a high temperature (150 ° C./30 minutes in the case of an epoxy-based adhesive). For this reason, the electrode film is exposed to a high-temperature atmosphere for a long time, and is significantly deteriorated. Even if curing is performed in a short time, sufficient adhesive strength and conductivity cannot be obtained. Since each of the adhesive application step and the adhesive curing step is required twice, the process becomes longer and it is necessary to have many in-process products.

An object of the present invention is to provide a manufacturing method which solves these problems.

[0008]

A quartz piece having electrodes formed on the front and back sides of a base of an airtight terminal through which a plurality of leads are passed is fixed to a quartz piece fixing portion of the base. Lee
A method of securing conduction between the lead and the electrode, wherein insulating bonding is applied to the quartz piece fixing portion of the base, and a conductive adhesive is applied to a conductive connection portion of the lead with the electrode. A first step of positioning the quartz piece on the lead, fixing the base and the quartz piece with the insulating adhesive, and electrically connecting the lead and the electrode with the conductive adhesive. And a method for manufacturing a crystal resonator having a second step of ensuring the above.

[0009]

In the method of manufacturing a crystal resonator according to the present invention, an adhesive application step for securing fixation and conduction is performed once, and an adhesive curing step is performed once. For this reason, the process of securing adhesion and conduction is short, and deterioration of the electrode is unlikely to occur.
Deterioration of various transducer characteristics can be prevented. The adhesive application step for securing adhesion and conduction is performed once, and the adhesive curing step is performed for one.
Since the number of times is increased, the number of steps can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a crystal resonator according to the present invention will be described.

FIG. 5 is a perspective view showing a part of a manufacturing process of a cylinder type quartz resonator as one embodiment of the present invention. Hereinafter, description will be given based on this drawing.

FIG. 5A is a perspective view of the airtight terminal. FIGS. 5B and 5C are perspective views showing a first step of the present embodiment. In this step, a conductive connection portion 8 between the lead 4 and the electrode 2 is formed.
(B) of applying a conductive adhesive 9 to the base material, and (c) of applying an insulating adhesive 7 to the quartz piece fixing portion 6 of the base 5. The adhesive may be applied simultaneously by three application devices, but it is preferable to apply the conductive adhesive first.

FIG. 5D is a perspective view showing a second step of this embodiment. In this step, the crystal blank 1 is positioned on the lead 4, the base 5 and the crystal blank 1 are fixed to each other with an insulating adhesive 7, and conduction between the lead 4 and the electrode 2 is secured by a conductive adhesive 9. . After the curing, the process proceeds to a post-process, and finally a quartz oscillator is completed.

The adhesive used in the present invention will be described.
Both the conductive adhesive and the insulating adhesive are preferably low-viscosity, high-thixotropic adhesives. An adhesive having a low viscosity, easy to apply with a dispenser or the like, and having a property of hardly flowing out after application due to high thixotropy is suitable for the practice of the present invention. (Thixotropic property is a property in which a viscous substance is apparently a liquid when it is flowing, but behaves like a solid while maintaining its shape when it is stationary.) Adhesive has a viscosity of 7.5 Pa
s, thixotropy 1.80, conductive adhesive viscosity 20Pa.
s, thixotropy 3.05 was used.

Although the adhesive is applied in the same order, it may be applied simultaneously by three supply devices. However, if an insulating adhesive adheres to the conductive adhesive application portion, there is a risk of causing a conduction failure. It is preferable to apply a conductive adhesive to the substrate and apply a non-conductive adhesive later. Thereby, it is possible to cope with the flow after the adhesive is applied, and the condition for selecting the adhesive is relaxed.

[0016]

According to the present invention, since the adhesive application step is performed once and the adhesive curing step is performed once, the time required for securing and conducting is shortened (half of the conventional method), thereby deteriorating the electrode. Is less likely to occur and deterioration of various transducer characteristics can be prevented.
Since the adhesive application step is performed once and the adhesive curing step is performed once, the steps can be simplified.

[Brief description of the drawings]

Fig. 1 Inside view of a quartz oscillator

FIG. 2 is a process chart for explaining a manufacturing method.

FIG. 3 is an internal view of a quartz oscillator.

FIG. 4 is an inside view of a quartz oscillator.

FIG. 5 is a perspective view showing a part of a manufacturing process of a cylinder type quartz resonator as one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Quartz piece 2 Electrode 3 Airtight terminal 4 Lead 5 Base 6 Quartz piece fixing part 7 Insulating adhesive 8 Conductive connecting part 9 Conductive adhesive

Claims (2)

[Claims] 1. A crystal piece fixing portion of a crystal piece having electrodes formed on the front and back sides is fixed to a base of an airtight terminal through which a plurality of leads penetrate, and conduction between the leads and the electrodes is provided. A method of manufacturing a crystal resonator, wherein an insulating adhesive is applied to a fixing portion of the base of the hermetic terminal to the quartz piece, and a conductive adhesive is applied to a conductive connection portion of the base with the electrode. A first step of positioning the quartz piece on the lead, fixing the base of the airtight terminal and the quartz piece with the insulating adhesive, and connecting the lead and the electrode with the conductive adhesive. A method for manufacturing a crystal resonator, comprising a second step of ensuring conduction. 2. The method according to claim 1, wherein in the first step, an insulating adhesive is applied after applying a conductive adhesive.
A manufacturing method of the crystal unit described in the above.