JP2002278557A - Electromagnetic type sound producing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sound leakage by preventing a gasket from deforming, in assembling and from forming a spacing by the narrow contact area of a buzzer and the gasket. SOLUTION: This electromagnetic sound producing body is formed with a casing 12, which contains a vibration sound producing section and has an approximately rectangular parallelepiped shape, the electromagnetic sound producing body 11 having a sound release hole 13 bored at one of the circumferential sidewalls of the casing 12, the gasket 20 which is attached to the front of the side wall bored with the sound release hole 13 and has an aperture 20b on the same axis as the axis of the sound release hole 13 and a protruding portion 14 which has a slope 14a on the sidewall bored with the sound release hole 13. The gasket 20 attached to the front of the protruding portion 14 is partly cut with a slope 20a and the slope 4a formed in the protruding portion 14 and the slope 20a formed at the gasket 20 come into tight contact with each other. Since the contact surfaces are sloped, surfaces deformation of the gasket 20 in assembly is prevented, the contact area is increased, the adhesion property is improved and gaps are eliminated, by which the sound leakage is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a mobile communication device such as a mobile phone or a pager (registered trademark),
The present invention relates to a surface-mounted electromagnetic sounding body that emits a ringtone upon reception, and particularly to a thin electromagnetic sounding body that is surface-mounted on a printed circuit board or the like in a mobile communication device.

[0002]

2. Description of the Related Art Conventionally, as this type of electromagnetic sounding body,
For example, as shown in FIGS. 10 and 11, the electromagnetic sounding body 1 is incorporated in a telephone cover 3 such as a mobile phone in a state of being surface-mounted on a printed circuit board 2. A sound emission hole 5 is formed in one of the side walls 4a of the thin rectangular casing 4 having a substantially rectangular parallelepiped shape that incorporates a vibration sound generator of a buzzer, and the sound emission hole 5 is formed in a side wall of the cover 3 of the telephone. The printed circuit board 2 faces the opening 3a provided.
Surface mounted on top.

Further, in order to prevent the ring tone emitted from the sound emitting hole 5 of the electromagnetic sounding body 1 from being trapped in the telephone cover 3, the sound emitting hole 5 and the side wall of the telephone cover 3 are provided. A gasket 6 for preventing sound leakage is provided in a gap between the opening 3a. The gasket 6 has a through hole 6 a communicating the sound emission hole 5 of the electromagnetic sounding body 1 and the opening 3 a of the telephone cover 3.

FIG. 11 is a cross-sectional view showing an electromagnetic sound generator surface-mounted on a printed circuit board before assembling a telephone cover provided with a gasket. In FIG. 11, the contact surface where the side wall 4a in which the sound emission hole 5 of the electromagnetic sounding body 1 is formed in the direction of arrow A and the side wall 6b of the gasket 6 of the telephone cover 3 slides in parallel is assembled. .

[0005]

However, the above-mentioned electromagnetic sounding body has the following problems. That is, when a telephone cover provided with a gasket is mounted on an electromagnetic sounding body surface-mounted on a printed circuit board, the contact surfaces of the two come into contact and the gasket is deformed, resulting in sound leakage. In addition, there is a problem that the contact area between the contact surfaces is small, a gap is easily formed between the buzzer and the gasket at the time of assembling, and the sound leaks.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to prevent deformation of a gasket when a buzzer and a gasket are assembled, and at the same time, increase the contact area to improve the adhesion and eliminate the gap. An object of the present invention is to provide an electromagnetic sounding body that eliminates sound leakage.

[0007]

In order to achieve the above object, an electromagnetic sounding body of the present invention comprises a substantially rectangular parallelepiped casing containing a vibration sounding portion of a buzzer, and one of the peripheral side walls of the casing. An electromagnetic sounding body comprising: an opened sound emitting hole; and a gasket attached to a front surface of the opened side wall and having an opening coaxial with the sound emitting hole. A projecting portion having a slope is formed on a side wall where a sound hole is formed, and a part of a gasket attached to the front surface of the projecting portion where the sound emitting hole is formed is cut into a slope and formed on a projecting portion of the casing. The slope that is formed and the slope formed on the gasket
It is characterized in that it is configured to contact.

[0008] Further, the contact surface between the projecting portion of the casing and the gasket is in close contact with and contact with only a slope formed on both.

Further, the contact surface between the projecting portion of the thin casing and the gasket is in close contact with and contact with the slope formed on both sides and the side surface of the buzzer.

[0010] Further, the contact surface between the projecting portion of the thin casing and the gasket is in close contact with and contact with a slope formed on the both and the upper surface of the buzzer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic sounding body according to the present invention will be described with reference to the drawings. FIGS. 1 to 7 relate to an electromagnetic sounding body according to a first embodiment of the present invention.
3 is a sectional view of a main part showing a state in which a telephone cover is incorporated in the electromagnetic sounding body. FIG. 2 is an exemplary sectional view showing a state before the telephone cover is incorporated into the electromagnetic sounding body of FIG. 1; FIG. 3 is a perspective view showing a contact state between the electromagnetic sounding body of FIG. 1 and a gasket. FIG.
FIG. 4 is a sectional view taken along line AA of FIG. 3. FIG. 5 is a top view of the electromagnetic sounding body. FIG. 6 is a front view of FIG. 5. FIG. 7 is a right side view of FIG.

In FIG. 1 to FIG.
Reference numeral 1 denotes a vibrating sound generator built in a thin rectangular casing 12 having a substantially rectangular parallelepiped shape. The casing 12 is composed of an upper case 12a and a lower case 12b made of resin, and peripheral side walls of the upper case 12a and the lower case 12b are fixed by ultrasonic welding. A horizontally long rectangular sound emission hole 13 is provided in one of the peripheral side walls of the casing 12 so that a ring tone emitted from the vibration sounding section can be emitted to the outside. A protrusion 14 having a slope 14a is formed on the front wall where the sound emission hole 13 is formed.

In FIG. 4, 15 is a diaphragm, 16 is a center pole, 17 is a coil, and 18 are electrode terminals provided at four corners on the rear surface of the casing 12.

3 and 4, a gasket 20 as a sound leakage preventing member is mounted on the protruding portion 14 in which the sound emission hole 13 is opened. This gasket 20
Is formed of a flexible member, for example, silicone rubber, and its shape is cut into a slope 20a as shown in FIG. The contact surfaces X of the two are configured so as to be in close contact with and contact with a slope 14a formed on the protrusion 14 of the casing 12 and a slope 20a formed on the gasket 20.

The gasket 20 is provided with a through hole 20b of substantially the same shape and size as the sound emission hole 13 on the same axis as the sound emission hole 13.

As shown in FIG. 1, the electromagnetic sounding body 11
Is mounted in the cover 3 of the mobile phone while being surface-mounted on the printed circuit board 2. An opening 3 a is provided in a part of the cover 3, and the opening 3 a is provided with a sound emitting hole 13 of the electromagnetic sounding body 11 and a through hole 20 of the gasket 20.
It is formed so as to communicate with b.

FIG. 2 is a cross-sectional view showing a state in which an electromagnetic sound generator surface-mounted on a printed circuit board is not assembled with a telephone cover provided with a gasket. 2, a slope 14a formed on the protruding portion 14 of the electromagnetic sounding body 11 in the direction of arrow B and a slope 20a formed on the gasket 20 come into close contact with each other at the contact surface X shown in FIG.

With the above-described structure, the buzzer and the gasket come into contact with each other on the slope when assembled, so that the gasket is not deformed, and the contact area between the two is increased, so that the adhesion is improved, and the gap is eliminated to eliminate sound leakage. Is done.

FIG. 8 is a perspective view showing the state of contact between the electromagnetic sounding body and the gasket according to the second embodiment of the present invention. The contact between the protruding portion 14 of the thin casing 12 and the gasket 20 is shown in FIG. The surface Y is in close contact with the slopes 14a, 20a formed on both surfaces and the contact surfaces 14b, 20c of some side surfaces. Therefore, the contact area between them increases.

FIG. 9 is a perspective view showing a contact state between the electromagnetic type sounding body and the gasket according to the third embodiment of the present invention, wherein the contact between the protrusion 14 of the thin casing 12 and the gasket 20 is shown. Since the surfaces Z are in close contact with and contact with the inclined surfaces 14a and 20a formed on both surfaces and the contact surfaces 14c and 20d of the upper surfaces, the contact area between them is increased accordingly.

According to the configurations described in the second and third embodiments, the gasket 20 is not deformed because the gasket 20 is deformed because the gasket 20 comes into contact with the inclined surface at the time of assembling. Elimination eliminates sound leakage.

[0022]

As is apparent from the above description,
According to the present invention, the contact surface between the buzzer and the gasket is formed to have a slope, so that the gasket can be prevented from being deformed when assembled. In addition, since the contact surface is widened, the adhesion between the buzzer and the gasket is improved, so that sound leakage due to the gap between the two can be eliminated, and an electromagnetic sounding body with excellent reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a main part sectional view showing a state in which an electromagnetic sounding body according to a first embodiment of the present invention is incorporated in a telephone cover.

FIG. 2 is a sectional view of a main part showing a state before the electromagnetic sounding body of FIG. 1 is incorporated into a telephone cover.

FIG. 3 is a perspective view showing a contact state between the electromagnetic sounding body of FIG. 1 and a gasket.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a top view of the electromagnetic sounding body of FIG. 3;

FIG. 6 is a front view of the electromagnetic sounding body of FIG. 5;

FIG. 7 is a right side view of the electromagnetic sounding body of FIG. 5;

FIG. 8 is a perspective view showing a contact state between an electromagnetic sounding body and a gasket according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing a contact state between an electromagnetic sounding body and a gasket according to a third embodiment of the present invention.

FIG. 10 is a sectional view of a main part showing a state in which a conventional electromagnetic sounding body is incorporated in a telephone cover.

11 is a sectional view of a main part showing a state before the electromagnetic sounding body of FIG. 10 is incorporated into a telephone cover.

[Explanation of symbols]

 Reference Signs List 2 Printed circuit board 3 Cover 3a Opening 11 Electromagnetic sounding body 12 Casing 13 Sound emitting hole 14 Projecting portion 14a Slope 14b, 14c Contact surface 15 Diaphragm 16 Center pole 17 Coil 18 Connection terminal 20 Gasket 20a Slope 20b Through hole 20c, 20d Contact surface X, Y, Z Contact surface

Claims (4)

[Claims] 1. A casing having a substantially rectangular parallelepiped shape containing a vibration sound generator of a buzzer, a sound emission hole formed in one of the peripheral side walls of the casing, and a front surface of the side wall where the sound emission hole is formed. An electromagnetic sounding body having a gasket attached and having an opening on the same axis as the sound emission hole, wherein a projecting portion having a slope is formed on a side wall of the casing where the sound emission hole is formed, and the sound emission is formed. The gasket attached to the front surface of the protruding portion having the hole cut a part thereof into a slope, so that the slope formed on the protruding portion of the casing and the slope formed on the gasket come into close contact with and come into contact with each other. An electromagnetic sounding body characterized in that: 2. The electromagnetic type sounding body according to claim 1, wherein a contact surface between the projecting portion of the casing and the gasket is in close contact with only a slope formed on both sides. 3. The electromagnetic sound generator according to claim 1, wherein a contact surface between the projecting portion of the thin casing and the gasket is in close contact with a slope formed on both sides and a buzzer side surface. body. 4. The electromagnetic sound generator according to claim 1, wherein a contact surface between the projecting portion of the thin casing and the gasket is in close contact with a slope formed on the both and the upper surface of the buzzer. body.