JP2853345B2 - Handset - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handset used for a telephone or the like, and more particularly to a case structure thereof.

[0002]

2. Description of the Related Art FIGS. 2A and 2B show a conventional handset, FIG. 2A is an external view, and FIG. 2B is a sectional view of a receiver.

As shown in FIGS. 2A and 2B, a case 1 is composed of an upper case 2 and a lower case 3, and an outer edge of the lower case 3 on the side of the upper case 2 is provided with the upper case 2 and the lower case 3. A decorative step groove 4 for concealing the displacement of the contact surface of the case 3 is formed, and the upper case 2 and the lower case 3 are closely attached without any gap. The upper case 2 is formed with a plurality of sound holes 6 for emitting a sound accompanying the sound of the speaker 5 attached in close contact with the inside of the upper case 2.

[0004]

However, in the above-mentioned conventional handset, since the volume inside the case 1 is small, when the speaker 5 rings, a pressure difference occurs inside and outside the case 1 and the diaphragm of the speaker 5 is good. And no sufficient volume can be obtained.

The present invention has been made to solve such a conventional problem, and provides a handset which can operate a diaphragm of a speaker satisfactorily and therefore can increase the volume. It is another object of the present invention to provide a handset capable of preventing entry of foreign substances such as dust and static electricity and preventing destruction of an electric circuit.

[0006]

According to the present invention, in order to achieve the above object, a case is provided in which a sound hole for eliminating a pressure difference between the inside and outside of the case is formed separately from the sound hole.

In the above technical means, an inner wall is provided in the case so as to face the sound hole.

[0008] The sound hole can be formed in a step groove formed in the lower case of the case.

[0009]

Therefore, according to the present invention, by forming a sound hole other than the sound hole in the case, the pressure difference between the inside and outside of the case can be eliminated, and the operation of the diaphragm at the time of sounding the speaker can be improved.

In addition, by providing the inner wall in the case so as to face the sound hole, it is possible to prevent foreign substances such as dust from entering the internal electronic circuit, and to provide a sufficient space from the sound hole to the internal electronic circuit. A distance can be ensured, and intrusion of static electricity into this electronic circuit can be prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 (A) and 1 (B) show a handset according to an embodiment of the present invention. FIG. 1 (A) is an external view and FIG.
(B) is a sectional view of the receiver.

In this embodiment, the same parts as those of the above-mentioned conventional example are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 1 (A) and 1 (B), elongated sound holes 7 are formed in both sides near the speaker 5 in a part of the step groove 4 formed in the lower case 3,
The pressure difference between the inside and outside of the case 1 is eliminated. An inner wall 8 is integrally provided in the lower case 3 so as to oppose the sound hole 7. The inner wall 8 can prevent dust from entering the sound hole 7 from the inside and can also prevent the sound hole 7. And a sufficient distance to the internal electronic devices.

In the above configuration, when a drive voltage is applied to the speaker 5, the diaphragm vibrates. At this time, since the inside and outside of the case 1 are at the same pressure by the sound vent hole 7, the diaphragm can be operated well and the volume can be increased. Since the inner wall 8 is provided so as to face the sound hole 7, foreign substances such as dust can be prevented from directly entering the internal electronic device from the sound hole 7. It is possible to secure a sufficient edge surface distance to the internal electronic circuit, and to prevent electrostatic breakdown of the electronic device.

In the above embodiment, the sound holes 7 are formed in the stepped grooves 4 of the lower case 3, but they may be formed in other places.

[0016]

As described above, according to the present invention, a sound hole other than the sound hole is formed in the case to eliminate a pressure difference between the inside and the outside of the case, thereby improving the operation of the diaphragm when the speaker is sounding. be able to. Therefore, the volume can be increased.

Further, by providing the inner wall in the case so as to face the sound hole, it is possible to prevent foreign substances such as dust from entering the internal electronic circuit, and to provide a sufficient space from the sound hole to the internal electronic circuit. A distance can be ensured, and intrusion of static electricity into this electronic circuit can be prevented. Therefore, destruction of the electronic circuit can be prevented.

Further, by forming the sound extraction hole in the stepped groove formed in the lower case of the case, the appearance can be improved without being noticeable.

[Brief description of the drawings]

FIG. 1A is an external view showing a handset according to an embodiment of the present invention; FIG. 1B is a cross-sectional view of a receiver section of the embodiment;

FIG. 2A is an external view showing a conventional handset, and FIG. 2B is a cross-sectional view of the conventional handset.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Upper case 3 Lower case 4 Step groove 5 Speaker 6 Sound hole 7 Sound hole 8 Inner wall

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-212854 (JP, A) JP-A-61-198852 (JP, A) Fully open Showa 57-48798 (JP, U) Really open Showa 62 161484 (JP, U) Japanese Patent Application No. 1-2131 (Japanese Utility Model Application No. 2-93858) Microfilm photographing the contents of the specification and drawings attached to the application (JP, U) Japanese Utility Model Application No. 1-10207 (JP, U) (58) Field of investigation (Int. Cl. ⁶ , DB name) H04M 1/02 -1/23

Claims (2)

(57) [Claims] 1. A sound provided on an outer wall of a case separately from a sound hole.
A hole, and the inside of the case, wherein the sound hole and the internal electron
A handset having an inner wall interposed between the handset and the device. 2. A sound vent holes are handset of claim 1, wherein formed on the stepped groove in the lower case of the case.