JPH028520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an adhesive structure for a thin plate-like object such as a diaphragm of a piezoelectric buzzer.

[Prior art] For example, in a piezoelectric buzzer for a waterproof watch,
As shown in FIG. 9, the diaphragm 14 is fixed with adhesive to a horn portion 15 formed integrally with the watch frame. This adhesive is shown in Figure 10 or 11.
It is attached as shown in the figure.

[Problems to be Solved by the Invention] When adhesive is applied as shown in FIGS. 10 and 11, a part of the adhesive sticks to the inner circumference of the diaphragm 14, causing vibrations of the diaphragm 14 to be It can affect the mode, affect the sound pressure, and also impair the sealing performance.

Further, when water pressure is applied from the sound emitting port 16 side, the diaphragm 14 is bent, and the piezoelectric element 17 may be damaged or the adhesion of the diaphragm 14 may be peeled off.

The present invention is designed to prevent the adhesive from extruding and to strengthen the fixing strength.

[Means for Solving the Problems] According to the present invention, the fixing shaft of the fixing member is formed with a rising portion for supporting a thin plate-like object and an adhesive reservoir, and the presser end of the presser member is provided with the above-mentioned adhesive. An adhesive extrusion part inserted into the reservoir part and a presser part for pressing the thin plate-like object are formed, and the rising part and the presser part sandwich the thin plate-like object and prevent the adhesive from running out. This is what I did.

[Example] In FIGS. 1 and 2, reference numeral 1 denotes a horn portion constituting a fixing member, which is formed integrally with a watch frame 2 in, for example, a waterproof watch. A rising portion 3 for supporting the diaphragm is formed on the inner peripheral portion of the fixed end of the horn portion 1, and a protrusion 4 for suppressing horizontal movement of the diaphragm is formed. Also protrusion 4
An adhesive reservoir 5 in the form of a U-shaped groove is formed on the outside. 6 is a sound emitting port.

3 and 4, reference numeral 7 denotes a holding member which is placed over the horn portion 1 of FIG. 2 with the diaphragm interposed therebetween. At the presser end of this presser member 7,
A presser part 8 is formed at a position opposite to the rising part 3 of FIG. 2, and an adhesive extrusion part 9 to be inserted into the adhesive reservoir part 5 of FIG. 2 is also formed. 10
is a hole for air vent.

The diaphragm is fixed in the following manner using the horn portion and the holding member described above. First of all, the fifth
As shown in the figure, adhesive 11 is injected into the adhesive reservoir 5 of the horn section. Then, the diaphragm 13 to which the piezoelectric element 12 is attached is placed on the rising portion 3. Next, the 6th
Place the presser member 7 over the horn portion 1 as shown in the figure. At this time, the adhesive extrusion section 9 is inserted into the adhesive reservoir section 5, and the adhesive is extruded toward the diaphragm 13.
When the holding portion 8 of the holding member 7 abuts against the diaphragm 13 as shown in FIG. 7, the diaphragm 13 is sandwiched between this and the rising portion 3 of the horn portion 1.
Therefore, the adhesive will not leak out and the adhesive will be securely fixed. FIG. 8 shows a state in which the adhesion is completed.

In this way, since the diaphragm 13 is fixed by the fixed end of the horn part and the holding member, the sealing performance is good.
Moreover, even if water pressure builds up from the sound emitting port 6 side, the diaphragm 1
Since the deflection of 3 is regulated by the holding member 7,
It can prevent damage or adhesive peeling even under high pressure. The hole 10 in the holding member 7 is formed to eliminate air resistance when the diaphragm vibrates.

[Effects of the Invention] According to the present invention, the adhesive inserted into the adhesive reservoir is extruded by the adhesive extrusion portion formed on the holding member, and the rising portion provided on the fixing member and the presser provided on the holding member are Since the diaphragm is sandwiched between the parts to prevent the adhesive from leaking, ease of assembly is improved and a stable vibration mode can be obtained. Moreover, the sealing performance is improved, and it is particularly effective when used in waterproof products.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the fixing member;
Fig. 2 is a sectional view taken along lines taken from Fig. 1, Fig. 3 is a front view showing one embodiment of the presser member, Fig. 4 is a sectional view taken taken taken taken from Fig. 3, and Figs. 5 to 7 are assembled. A partially enlarged sectional view showing the process, FIG. 8 is a sectional view showing the state after assembly, FIG. 9 is a sectional view showing an example of a conventional piezoelectric buzzer, and FIGS. 10 and 11.
Each figure is an enlarged sectional view showing an example of the bonded portion in FIG. 9. DESCRIPTION OF SYMBOLS 1... Fixed member, 3... Standing part, 5... Adhesive reservoir part, 7... Holding member, 8... Holding part, 9...
...Adhesive extrusion part, 12...Piezoelectric element, 13...
diaphragm.

Claims (1)

[Scope of Claims] 1. A rising part is formed on the fixing member to support a portion slightly inward from the outer peripheral edge of the thin plate-like object, and an adhesive reservoir is formed outwardly from this rising part, and the holding member is provided with the above-mentioned adhesive. 1. A bonding structure for a thin plate-like object, characterized in that an adhesive extrusion part inserted into a reservoir part is formed, and a holding part is formed between which the above-mentioned rising part holds the thin plate-like object.