JPH09149447A - Sound emitting structure of housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten sound pressure sound-emitted from the sound emitting hole of a housing in the sound emitting structure of a housing in a compact electronic equipment such as a pager building-in a speaker. SOLUTION: This structure provides a waterproof film 14 for the sound emitting hole 12 of the housing 11 housing a speaker (speaker case) 22. Then the waterproof film 14 is fitted to the inside face of the housing 11 with respect to the sound emitting hole 12 and a clearance (c) is provided between this waterproof film 14 and the speaker (speaker case) 22. Then a dust proof layer 15 preventing foreign matters from entering is fitted to the outside face of the housing 11 with respect to the sound emitting hole 12. In adition a recessed part 13 consecutive to the sound emitting hole 12 is formed at the outside face of the housing to fit a protection cover 16 with a sound emitting hole 17 by intermediately mounting the dustproof layer 15 to this recessed part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sounding part structure of a casing having a waterproof function in a small electronic device such as a pager having a speaker for notifying an incoming call signal of itself.

[0002]

2. Description of the Related Art Most of portable electronic devices, especially pagers, have a speaker for notifying an incoming call signal of their own in a main body case and a sound emission hole in a case. In recent years, in order to withstand use in various environments, equipments having a waterproof function or a dust-proof function have appeared on the device body.

FIG. 3 is a cross-sectional plan view of a sound emitting section structure of a casing in such a waterproof small electronic device. 31 in the figure
Is a housing, 32 is a concave portion, 33 is a dustproof cloth (nonwoven fabric, etc.), 34
Is a waterproof film (ethylene tetrafluoride, porous film, etc.), 41 is a substrate, 42 is a speaker case, 43 is a speaker body, 44 is a speaker cone, and 45 is a sound leakage prevention gasket. Reference numeral 46 is a protective cover, and 47 is a sound output hole. That is, as shown in the figure, the sound emitting hole 4 is provided in the housing 31.
7 is formed, and a concave portion 32 including a sound emitting hole 47 portion is formed on the outer side surface.

In the recess 32, a waterproof film 34 made of ethylene tetrafluoride, a porous film or the like having a waterproof function and a function of allowing sound to pass through a large number of micron units, and a non-woven fabric having a dustproof function are used. The dust-proof cloth 33 and the dust-proof cloth 33 are interposed in this order and a protective cover 46 is attached. The protective cover 46 has three slit-shaped sound emission holes 47, 4
7, 47 are formed. Further, a gasket is mounted on the substrate 41 inside the housing 31, and is provided between the sound emitting opening of the speaker case 42 having the speaker body 43 and the speaker cone 44 and the inner surface of the housing 31 around the sound emitting hole 47. 45 is interposed.

[0005]

As described above, in the conventional sound emitting part structure of the case, particularly the one in which the waterproof function is emphasized,
The structure is such that the gasket 45 is interposed between the sound output opening of the speaker case 42 and the inner surface of the housing 31 around the sound output hole 47 (see FIG. 3). That is, the gasket 45
Due to the closed structure, the vibration of the speaker cone 44 of the speaker body 43 is trapped inside the speaker case 42 by the waterproof film 34 and the gasket 45, and the sound pressure emitted from the sound emission hole 35 is extremely high. It was attenuated.

An object of the present invention is to increase the sound pressure emitted from a sound emission hole of a casing, particularly in a casing, of a small electronic device such as a pager having a built-in speaker. To do so.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is a sound emitting part structure of a housing for accommodating a speaker case and having a sound emission hole, wherein It is characterized in that a waterproof film is attached to the inner surface of the housing with respect to the hole, and the speaker case is arranged in the housing so that the waterproof film and the sound output port of the speaker case are separated by a predetermined distance.

As described above, since the speaker case housed in the housing is installed with a predetermined gap between the speaker case and the waterproof film attached to the inner surface of the housing of the sound output hole, the conventional gasket is used. It is not the closed structure used. Therefore, the amount of vibration of the speaker cone does not decrease, the sound pressure in the vicinity of the sound output hole facing the sound output port of the speaker increases, and the waterproof film is present in that part, so that the sound pressure decrease is the smallest. Therefore, the sound pressure emitted from the sound emission hole of the housing can be increased by, for example, about 8 dB as compared with the conventional closed structure.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the sound emitting section structure of a casing according to the present invention will be described below with reference to FIGS. 1 and 2. First, FIG. 1 is a perspective view showing a pager as a small electronic device as an example to which the present invention is applied, and FIG. 2 is a cross-sectional plan view showing an enlarged sound emitting portion structure of the pager. 1 and 2, 11 is a housing, 12 is a sound output hole, 13 is a recess, 14 is a waterproof film (tetrafluoroethylene, porous film, etc.), and 15 is a dustproof layer (dustproof cloth (nonwoven fabric, etc.). )), 16 is a protective cover, 17 is a sound output hole, 21 is a substrate, 22 is a speaker case, 23 is a speaker body, 24 is a speaker cone, and c is a gap.

In this embodiment, as shown in the figure, the pager case 11 has a sound output hole 12 on the inner side surface thereof at the mating portion of the upper case and the lower case which form the case 11. The sound output hole 12 is located in the center and is continuously formed with a recess 13 on the outer surface side that surrounds the sound output hole 12. On the inner surface of the housing 11 with respect to the sound output holes 12, a waterproof film 14 made of ethylene tetrafluoride or a porous film having a waterproof function and a function of allowing sound to pass through a large number of micron units is provided. It is pasted. further,
A protective cover 16 is attached to the concave portion 13 of the housing 11 by adhesion through a dustproof layer 15 made of a dustproof cloth such as a nonwoven fabric having a dustproof function. This protective cover 16 has
Three slit-shaped sound output holes 17, 17, 17 are formed.

A speaker case 22 is mounted on a substrate 21 provided inside the housing 11, and a speaker body 23 and a speaker cone 24 are provided in the speaker case 22. Further, a gap c of about 0.8 to 0.2 mm is evenly formed between the sound emission opening of the speaker case 22 and the waterproof film 14 on the inner surface of the housing 11. As described above, in the sound output part structure of the present invention, the sound emission port of the speaker case 22 in the housing 11 and the waterproof film on the inner side surface of the housing 11 are not provided in the conventional closed structure using a gasket. 0.8 with 14
The gap c of about 0.2 mm is uniformly opened and opened.

As described above, in the sound emitting part structure of the housing according to the embodiment of the present invention, the speaker case 22, the gap c, the waterproof film 14, the sound output hole 12, are sequentially arranged from the inside of the housing 11. Since the dustproof layer 15 and the protective cover 16 are arranged, the following operational effects can be exhibited. (1) 0.8 to 0.2 mm between the sound emission opening of the speaker case 22 in the housing 11 and the waterproof film 14 on the inner surface of the housing 11.
By uniformly opening the gap c to some extent, the conventional closed structure using a gasket is not provided, and therefore the vibration amount of the speaker cone 24 does not decrease. (2) Sound output hole 12 facing the sound output port of speaker case 22
Since the sound pressure in the immediate vicinity is high and the waterproof film 14 is arranged in the immediate vicinity of the sound output hole 12, the decrease in the sound pressure is minimized.

In the above embodiments, the pager is used as a small electronic device having a waterproof function to which the present invention is applied. However, the present invention is not limited to this, and a radio, a tape recorder or the like can be used. It may be another small electronic device including a sound reporting unit.

[0014]

As described above, according to the sound-reporting part structure of the housing according to the invention described in claim 1, the speaker case in the housing is provided between the waterproof film attached to the inner surface of the housing of the sound output hole. Since the speaker cones are installed with a certain gap between them, the amount of vibration of the speaker cone does not decrease, and there is a waterproof film in the part where the sound pressure near the sound emission hole of the speaker is high. The decrease can be minimized. Therefore,
The sound pressure emitted from the sound output hole of the housing can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pager as a small electronic device as an example to which the present invention is applied.

FIG. 2 is a cross-sectional plan view showing, in an enlarged manner, a sound emitting unit structure of the pager of FIG.

FIG. 3 is a cross-sectional plan view showing an example of a sound emitting unit structure of a casing in a conventional small electronic device.

[Explanation of symbols]

 Reference Signs List 11 housing 12 sound emission hole 13 recess 14 waterproof film (tetrafluoroethylene, porous film, etc.) 15 dustproof layer (dustproof cloth (nonwoven fabric, etc.) 16 protective cover 17 sound emission hole 21 substrate 22 speaker case 23 speaker body 24 Speaker cone c gap

Claims (1)

[Claims] 1. A sound-reporting part structure of a housing for accommodating a speaker case and having a sound output hole, wherein a waterproof film is attached to an inner side surface of the housing with respect to the sound output hole. A sound reporting unit structure for a housing, wherein the speaker case is arranged in the housing so that a sound output port of the speaker case is separated from the sound outlet for a predetermined period.