JP2003264475A - Portable radio equipment including sound emitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide portable radio equipment including a sound emitting structure, wherein efficiency is enhanced in sound emission and the sound quality is improved. <P>SOLUTION: An hole is arranged on the rear surface of the chassis of a main body unit, wherein a sealed space is formed by a front surface cover for fixing a speaker and a chassis. A waterproof and air-permeable membrane which resonates in bass with the sealed space on the rear surface of the speaker is adhered onto the inner side of the hole. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless device having a sound emitting structure with a speaker.

[0002]

2. Description of the Related Art An example of a conventional sound emitting structure of a portable wireless device having a speaker for transmitting a call sound to a user is shown in FIG.
Will be described with reference to the longitudinal sectional view of FIG.

The main body unit of a conventional portable radio device is composed of a front cover 1 to which a speaker 7 is fixed, a chassis 2 to which a substrate 5 is fixed by a screw 6, and a back cover 3 which hides an exposed rear surface of the chassis 2. The battery pack 4 is mounted on the back side of the main body.

The back surface of the speaker is sealed by a front cover 1 and a chassis 2, and a sound emitting structure is formed by the diaphragm of the speaker 7, the front cover 1 serving as the front baffle plate of the speaker 7, and the sealed space. It

[0005]

Since the conventional portable wireless device is required to have a compact and high-density structure and a waterproof structure, the space sealed behind the speaker 7 becomes small and the internal air volume is reduced. We cannot secure enough. Therefore, there is a problem in that the sound pressure particularly in the low frequency range is deteriorated and the sense of volume is lost, and the original performance of the speaker cannot be sufficiently exhibited.

An object of the present invention is to provide a portable wireless device having a sound emitting structure with improved sound emitting efficiency and improved sound quality.

[0007]

The above object of the present invention is to provide an opening hole in the back surface of a chassis of a main unit, and to form resonance in a low sound with a space sealed on the back surface of a speaker inside the opening hole, Moreover, it is possible to effectively solve the problem by attaching a vibration film having waterproofness and breathability.

If such a means is adopted, the resonance formed by the vibrating film imposes an effective acoustic load on the diaphragm of the speaker at low sound, and the sound emission characteristic at low sound of the speaker is improved. is there.

Further, it is possible to adjust the atmospheric pressure by the air permeability of the vibrating membrane, and thus it is possible to balance the internal and external atmospheric pressures caused by the temperature difference or the altitude difference. Sound emission characteristics are maintained.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A portable radio device having a sound emitting structure according to the present invention will be described in more detail with reference to the embodiments of the invention shown in FIGS.

FIG. 1 is a vertical sectional view of a portable wireless device of the present invention, and FIG. 2 is a front view thereof. The main body unit of the portable wireless device of the present invention includes a front cover 1 to which a speaker 7 is fixed, a chassis 2 to which a substrate 5 is fixed by a screw 6, and a back cover 3 which hides a rear exposed portion of the chassis 2. The battery pack 4 is mounted on the back side of the main unit.

The rear surface of the speaker 7 is sealed by the front cover 1 and the chassis 2. In addition, the front cover 1 is provided with a plurality of holes 11 through which sound waves from the speaker 7 pass.

Here, an opening hole 11 is formed on the rear surface of the chassis 2.
Is formed, and a vibrating membrane 8 having waterproofness and breathability is attached to the inner surface by a double-sided tape 9.
The weight and hardness of the vibrating membrane 8 are set so that resonance is formed with the closed space on the back surface of the speaker 7 in the low frequency range. Further, the back cover 3 is formed with a hole 12 for passing a sound wave at a position corresponding to the opening hole 11.

With the above structure, the diaphragm 8 and the speaker 7
Due to the resonance formed with the back surface of the speaker, a low-range and effective acoustic load is applied to the diaphragm of the speaker 7, and therefore, the sound emission characteristic in the low-range of the speaker 7 is improved, and good sound quality can be obtained.

[0015]

According to the present invention, since the resonance structure is formed by the vibrating membrane, it is possible to apply an effective acoustic load with low sound to the diaphragm of the speaker, and thus the speaker 7
It is possible to improve the sound emission characteristics in the bass. Furthermore,
Air pressure can be adjusted by the air permeability of the vibrating membrane, and it is possible to prevent the speaker diaphragm from being affected by the difference between the inside and outside pressures caused by the temperature difference or the altitude difference. Further, sound emission from the hole on the back surface improves the overall sound pressure, so that it is possible to provide a portable wireless device with extremely excellent sound emission efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional view for explaining an embodiment of an invention of a portable wireless device having a sound emitting structure according to the present invention.

FIG. 2 is a front view for explaining an embodiment of the invention of a portable wireless device having a sound emitting structure of the present invention.

FIG. 3 is a vertical cross-sectional view for explaining an example of a conventional portable wireless device having a sound emitting structure.

[Explanation of symbols]

1 ... Front cover, 2 ... Chassis, 3 ... Rear cover, 4 ...
Battery pack, 5 ... Board, 6 ... Screw, 7 ... Speaker, 8 ...
Vibration film, 9 ... Double-sided tape, 10, 12 ... Hole, 11 ... Open hole.

Claims (2)

[Claims] 1. A speaker, a front cover that fixes the speaker and is provided with a hole for transmitting sound waves from the speaker, a chassis that forms a closed space with the front cover, and a chassis on the back surface of the chassis. A portable radio device having a sound emission structure, comprising: a vibrating film fixed to an opening provided; the vibrating film forms resonance in a low sound with a space sealed on a back surface of a speaker. 2. The portable wireless device according to claim 1, wherein the vibrating membrane is waterproof and breathable.