JPH02107015A - Mounting part construction for crystal resonator - Google Patents

Abstract

PURPOSE:To prevent the short circuit between the internal electrodes of crystal resonator and performance deterioration due to vibration leakage by providing a projecting part at the position of the electrode of a case bottom surface, applying conductive adhesives there, and executing mechanical fixation and electric connection. CONSTITUTION:A projecting part 5 is formed at a bottom surface 4' of a case 4 consisting of insulating materials such as ceramics, the position of the projecting part 5 is that where an electrode 1' on the base part of a vibrating piece 1 faces the bottom surface 4' of the case, and an electrode 3 of the case bottom surface is an electrode film coated on the formation of the projecting part 5. Conductive adhesives 2 are dropped and applied to the projecting part 5, pressured and bonded to the position, where the electrode 1' of the oscillating piece corresponds to the conductive adhesives 2, by weak force, heated and set, the base part of the vibrating piece 1 is supported, and the electric connection is executed. Thus, the defective article produced due to the vibrating energy leakage caused by the short circuit of the electrode or imbalanced support can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a case made of a thin insulating material suitable for surface mounting of a crystal resonator unit used in a small electronic device. This provides a preferred structure for mounting the pieces.

[Summary of the invention]

In the present invention, when mounting a thin plate-shaped vibrating piece in a case, both opposing TL poles are attached and fixed with a conductive adhesive. A convex part is provided at the position for this fixation, that is, at the electrode position on the bottom of the case, and a conductive adhesive is applied by dropping it there to obtain mechanical fixation and electrical connection. This prevents performance deterioration due to misalignment of the mount position, short circuit between the internal mold A of the crystal oscillator, and vibration leakage caused by the conductive adhesive.

[Conventional technology]

The conventional mount structure has an electrode 3 plated with Au on the bottom surface 4' of the case 4, as shown in FIGS. 2a and 2b.
Conventionally, a conductive adhesive 2 has been applied to both sides so that the electrode portion of the vibrating element 1 is placed above that position. At that time, the position at which the drop was applied was determined visually using the electrode position as a guide. Therefore, in the conventional method in which the vibrating element is mounted under such conditions that the position is different and the amount of conductive adhesive is not constant, when the vibrating element 1 is pressed from the state shown in Fig. 2, the result is as shown in Fig. 2 a. The conductive adhesive 2 flows in the plane direction, and as a result, vibration energy leaks due to electrode shorts and unbalanced support, resulting in defective products and performance deterioration, which is a problem.

[Problem to be solved by the invention]

The present invention solves these problems by clearly setting the position of the electrode of the case where the electrode of the vibrating element should come into contact with the case, and by changing the properties of the conductive adhesive that is applied by dropping. It also improves conditions.

[Means to solve the problem]

A convex part is provided on the bottom of the case where the electrode of the vibrating piece is to be mounted, and conductive adhesive is applied by dropping it onto the convex part.
This is to keep the mounting position constant.

〔Example〕

FIGS. 1a and 1b show the structure of a mount according to the present invention, in which a convex portion 5 is formed on the bottom surface 4' of a case 4 made of an insulating material such as ceramic or porcelain.

The position of this convex portion is the position where the electrode 1' at the base of the vibrating piece 1 faces the bottom surface 4' of the case as shown in FIG. It also serves as a physical connection. Therefore, the number of convex portions is equal to at least the number of connection terminals required by the vibrating element.

The convex portion 5 is formed by molding using a mold or the like in the process of manufacturing the case, and therefore, the accuracy of its dimensions and position can be controlled in the same way as the design of the vibrating element. Further, the electrode 3 on the bottom of the case is an electrically conductive membrane adhered onto a convex portion 5 as shown in FIG.

In order to accommodate and fix the vibrating element 1 in the case 4 configured as described above, the conductive adhesive 2 is applied dropwise to the convex portion 5 as shown in FIG. At this time, the tip of a dripping tool such as a minute nozzle or a sex needle is brought into contact with the top of the convex portion 5. As shown in FIG. 3, the amount is such that it rises slightly above the surface of the electrode. After that, as shown in FIG. 1a, the electrode 1' of the vibrating element is
Apply pressure with a weak force to the position corresponding to the conductive adhesive 2 described in Section 2 to adhere. The posture and position at this time ensure the conditions specified for the case 4 and the vibrating element 1. This state is maintained by the viscosity of the conductive adhesive 2, which is then heated and cured to support the base of the vibrating element and to establish electrical connection through this fixation. Although the embodiments described so far are cases in which a conductive adhesive is used as the bonding medium, the convex portion can be similarly utilized in the case of bonding using a brazing material such as a solder ball or solder paste.

〔Effect of the invention〕

The present invention has the following effects due to the structure as described in detail. In other words, (11) The convex portion indicates a position determined by design, and serves as a reference for the position of the subsequent process, resulting in good workability.

(2) When applying the conductive adhesive to the convex portion, the surface serves as a guide for the tool, allowing it to be positioned accurately and in a short time.

(3) With the above-described mounting structure, it is possible to prevent defective products due to short-circuits between electrodes and performance degradation due to non-uniformity of the support structure, and a high-quality, thin crystal vJ unit can be obtained.

[Brief explanation of drawings]

Figure 1+a1. fbl is a drawing showing the mount of the present invention; , (b) is +81 figure 8-Δ
', and FIG. 3 is an enlarged cross-sectional view of essential parts of the present invention. 1... Vibrator piece 2... Conductive adhesive 3...-
Electrode 4...Case 5 ・Convex part and above Applicant: Seiko Electronic Components Co., Ltd. Agent Patent attorney: Keisuke Hayashi・1+f Indication of the case of Miden 1°, Kyocho-ku, 1988 Patent Application No. 259949 Title of the invention Relationship with ISn that corrects the structure of the crystal oscillator mount

Claims (1)

[Claims] It has a structure in which a thin plate-shaped vibrating piece is mounted at a predetermined position on the bottom of a case made of an insulating material for electrical connection,
In the case where the electrode part of the vibrating element and the predetermined position are mounted face-to-face, the predetermined position is the electrode part, and the bottom surface of the case at the predetermined position forms a convex part. The structure of the crystal oscillator mount is a distinctive feature.