JP2002271465A - Mounting structure for loudspeaker of portable electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the sound permeability of the receiver part of a portable electronic device, to enhance its sound quality, to increase its output level, and to enhance its waterproof function. SOLUTION: An air-permeable waterproof sheet 25 is pasted on the inner surface of the receiver part 6 in which sound passage holes 18 are bored and formed in such a way that the periphery of the receiver part is left. A waterproof packing 21 which surrounds the waterproof sheet is installed so as to come into contact with the inner surface of the receiver part. A loudspeaker 22 is installed in a state that it presses the waterproof packing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure of an electronic device which may be used outdoors, such as a portable radio, and more particularly to a speaker mounting structure of a portable electronic device in which a waterproof function of a speaker mounting portion is improved. It is related.

[0002]

2. Description of the Related Art Electronic equipment used outdoors, such as portable radios, has a water discharge structure so that it can be used even during rainfall. In particular, a hole for sound transmission is formed in the receiver, and the receiver has a waterproof structure independently.

A conventional speaker mounting structure of a portable electronic device will be described with reference to FIGS.

FIG. 2 shows the appearance of the portable radio, in which 1 is the main body of the portable radio, 2 is the case, 3
Is a display unit, 4 is an input unit provided with dial keys and function keys for function selection, and 5 is an operation unit provided with a switch button for switching between a transmission state and a reception state. A receiving unit, 7 is a transmitting unit, and 8 is an antenna extending from the upper end of the portable wireless device main body 1.

FIG. 3 is a view taken in the direction of arrows AA in FIG. Referring to FIG. 3, a conventional speaker mounting structure of a portable electronic device will be described.

The case 2 is composed of a front case 11 and a rear case 12, the joints of which are sealed in a watertight manner, and a battery pack 13 is detachable from the rear case 12. A frame 14 is provided inside the case 2, and a wiring board 15 is held on the frame 14. A liquid crystal display 17 is provided on the wiring board 15 via a base 16.

The receiving section 6 has a large number of sound holes 18 formed therein.
A waterproof sheet 19 is provided on the inner surface of the earpiece 6 to cover all of the sound holes 18, and a ring-shaped waterproof packing 21 for pressing around the waterproof sheet 19 is provided. A highly airtight material is selected as the material of the waterproof sheet 19.

The speaker 22 is opposed to the receiver 6.
The speaker 22 is held by a speaker holder 23, and the speaker holder 23 is attached to the front case 1.
1 is fixed by a required fixing means such as a screw.
The waterproof sheet 19 and the waterproof packing 21 are sandwiched between the front case 11 and the speaker holder 23 so that the waterproof packing 21 bends by a predetermined amount to exhibit a waterproof function.

The sound hole 18 is completely closed by the waterproof sheet 19, and rainwater flowing around the waterproof sheet 19 is prevented from being pressed by the waterproof packing 21. Between the front case 11 and the front case 11 is a waterproof line.
This prevents rainwater from entering the space 24 between the waterproof sheet 2 and the waterproof sheet 19.

[0010]

In the above-described conventional speaker mounting structure for a portable electronic device, a highly airtight waterproof sheet 19 is used. If the sound pressure of the loudspeaker is increased in order to increase the sound volume, there is a problem that the waterproof sheet 19 clutters and the sound generated from the loudspeaker is reduced, resulting in a deterioration in sound quality.

The seal line of the receiver 6 is formed at the contact surface between the waterproof sheet 19 and the front case 11, and the waterproof sheet 19 itself is thin and lacks elasticity, so that the sealing function is not high. If there is unevenness on the surface of the front case 11, there is a possibility that rainwater will flow in, and will go around the speaker holder 23 and enter the inside of the case 2.

The present invention has been made in view of the above circumstances, and has an object to improve sound permeability in a receiving section, improve sound quality, increase sound volume, and improve a waterproof function.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a waterproof sheet having air permeability is attached to an inner surface of a receiving portion of a case having a sound hole so as to leave a periphery of the receiving portion. The present invention relates to a speaker mounting structure of a portable electronic device in which a waterproof packing surrounding the receiver is provided in contact with the inner surface of the earpiece, and a speaker is provided in a state where the waterproof packing is pressed.

[0014]

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

FIG. 1 is a view corresponding to the view taken along the line AA in FIG. 2. In FIG. 1, the same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

A waterproof sheet 25 is attached to the back of the receiver 6 in a watertight manner. The waterproof sheet 25 is made of a material having air permeability and allows the passage of water and water vapor. The size is smaller than the area of the receiver 6. A ring-shaped waterproof packing 21 is provided so as to surround the waterproof sheet 25 so as to directly contact the back surface of the receiver 6. The inner diameter of the waterproof packing 21 is sufficiently larger than the outer diameter of the waterproof sheet 25, and the waterproof sheet 25 does not contact the waterproof packing 21.

The speaker 22 is held by a speaker holder 23, and the speaker holder 23 is fixed to the front case 11 by a fixing means such as a screw. Accordingly, the waterproof packing 21 is sandwiched between the front case 11 and the speaker 22, and the fixing means presses the speaker 22 against the waterproof packing 21 so that the waterproof packing 21 is bent by a predetermined amount.

In this embodiment, the waterproof packing 21 is used.
The contact surface between the front case 11 and the front case 11 is a waterproof line 26.
Since the waterproof packing 21 itself comes into close contact with the front case 11, the waterproof property is sufficiently exhibited. Therefore, infiltration of rainwater through the waterproof line 26 is completely prevented, and water enters from the waterproof line 26 into the case 2 and the space 24 between the waterproof sheet 25 and the speaker 22. Is gone. The water that has slightly passed through the waterproof sheet 25 enters the space 24, but the entered moisture escapes again from the waterproof sheet 25.
In addition, since the water vapor in the space 24 also escapes through the waterproof sheet 25, the space 24 does not remain wet or moist.

As described above, since the waterproof sheet 25 has air permeability, sound permeability is improved, and a large sound pressure can be obtained.
The waterproof sheet 25 sticks and lowers sound quality,
Eliminate the difficulty of hearing.

[0020]

As described above, according to the present invention, a breathable waterproof sheet is attached to the inner surface of the receiving section of the case where the sound hole is formed so as to leave the periphery of the receiving section. Since the waterproof packing surrounding the waterproof sheet is provided in contact with the inner surface of the earpiece, and the speaker is provided in a state where the waterproof packing is pressed, the speaker sound is prevented from chattering, the predetermined sound pressure is secured, and the speaker sound is secured. The difficulty of hearing is resolved,
Further, it has an excellent effect of not impairing waterproofness.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is an external view of a portable wireless device.

FIG. 3 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Portable radio body 11 Front case 18 Sound hole 21 Waterproof packing 22 Speaker 23 Speaker holder 24 Space 25 Waterproof sheet 26 Waterproof line

Claims (1)

[Claims] An air-permeable waterproof sheet is attached to an inner surface of a receiving section of a case having a sound-passing hole so as to leave a periphery of the receiving section, and a waterproof packing surrounding the waterproof sheet is attached to the receiving section. A speaker mounting structure for a portable electronic device, wherein a speaker is provided so as to be in contact with an inner surface of the unit and press the waterproof packing.