JP2670662B2 - Waterproof case for portable sound generators - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable case for a small sound generating device, and more particularly to a portable case having a window with a breathable ultrathin waterproof film. The present invention relates to a waterproof case for a sound generating device.

[0002]

2. Description of the Related Art As is well known, a general plastic film or a bag made of this is highly preferable as a waterproof film or a waterproof case because of its high gas barrier property and low moisture permeability. I am involved in everyday life. For example, a sound generating device (for example, a radio, a tape recorder, etc.) is housed in a waterproof case (see, for example, Japanese Utility Model Laid-Open No. 59-143131), or a speaker or buzzer portion of the radio. Only the part is covered with a waterproof film (Japanese Utility Model Publication No. 58-19890, Japanese Utility Model Publication No. 1-2230).
No. 2).

The waterproof film will be described. In the above-cited Japanese Utility Model Publication No. 1-23022, when a loudspeaker opening is covered with a waterproof film and a speaker is provided in the opening through a packing, a minute projection is formed on the periphery of the opening where the packing hits. It is shown that a line is provided, and a waterproof film is provided between the periphery and the packing while providing tension, and waterproofing and deterioration of sound quality are prevented. On the other hand, the above-mentioned Japanese Utility Model Publication No. 58-19890 discloses that the back of a rainwater-penetrable speaker is covered with a breathable waterproof film.

Therefore, it is conceivable to use the breathable waterproof film shown in the latter publication instead of the waterproof film covering the opening of the speaker shown in the former publication. However, when a breathable waterproof film is used in the opening of the speaker, the breathable waterproof film has extremely low mechanical strength, which makes it difficult to cover the film while tensioning the film and often breaks it. There was a problem.

Therefore, the inventors of the present invention have made earnest and trial-and-error attempts to solve such a problem. As a result, the breathable ultra-thin waterproof film does not deteriorate the sound quality even if the film is not tensioned. However, in order to allow the curtain vibration due to the sound, it has been found that the film ears may be sandwiched and fixed in advance by a pair of spacer rings.

It is known that a breathable waterproof film is sandwiched by a pair of spacer rings inside the buzzer (see Japanese Utility Model Laid-Open No. 62-3188). Although the buzzer housing covers the outer surface of the waterproof film, the sound-generating component is directly located on the inner surface of the waterproof film, which may damage the breathable ultra-thin waterproof film when mounting the sound-generating component. Yes, it cannot be adopted.

From the above, the present invention has been made for the following purposes. 1) The waterproof case was provided with a window, and an ultrathin waterproof film capable of being ventilated only in this window was provided with some allowance. 2) The waterproof case was used to wrap a portable small sound generating device, and the window of 1) was tried to be positioned at the sound generating position. 3) By applying this waterproof case to a bag made of a plastic film, it was tried to protect a breathable ultrathin waterproof film having a low mechanical strength even though it is a flexible bag. 4) The work of providing a breathable ultrathin waterproof film on this window was facilitated and the film was prevented from being damaged during the work.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention has been made in order to achieve the above-mentioned various objects, and the gist of the present invention is to provide a perforation in a transition zone of a waterproof case in which a sound generating device is inserted. An air-permeable ultrathin waterproof film is provided on the outer surface side of the window zone, and a porous film protective cover is provided on the outer surface side of the waterproof film.
In a waterproof case provided with a plate, heat is applied by sandwiching the perimeter ears of the breathable ultra-thin waterproof film with a pair of thin-walled spacers having substantially the same shape as the outer shape of the window zone. Welded,
A portable case for a small sound generating device is characterized in that the thin spacer is fixed between the waterproof case and a film protective cover plate.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. 1 is a schematic view of a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view of a second embodiment of the present invention, which corresponds to a main part of FIG. To do. 4 is a side view taken along the arrow a in FIG. 3, FIG. 5A is a side view taken along the arrow b in FIG. 3, and FIG. 5B is a cross-sectional view taken along the arrow C in FIG.

The first embodiment will be described. In this embodiment, a transparent vinyl bag is provided with a window, and a breathable ultra-thin waterproof film is provided on the window, and a small radio is put in the transparent vinyl bag and suspended in a bathroom or the like. To use.

In FIGS. 1 and 2, reference numeral 1 is a transparent vinyl bag having a size of 280 mm in length and 210 mm in width, and an opening is provided above. Therefore, the size of the bag 1 matches the size of the small radio. That is, the upper edges of the front and rear members 2 and 2a of the bag 1 are wound together and sealed. At this time, a mounting piece 3 is attached to the front member 2, one tape-shaped fastener 4 is provided on the mounting piece 3, and the other tape-shaped fastener-4a is provided on the rear surface member 2a. The tape-shaped fasteners-4 and 4a are engaged to seal the bag 1. This bag 1 is provided with a hanging string 5 so that it can be suspended at an appropriate place.

Here, the following elliptical window 6 is provided slightly below the center of the front member 2 of the bag 1. That is, the window zone of the front member 2 is provided with a large number of pores 7, 7 ... With a pitch of about 2 mm. Further, a breathable waterproof film 9 having elliptical ears 8 is provided on the outer surface side of the window zone. On the outer surface side of the breathable waterproof film 9, a film protection cover plate 11 provided with a large number of pores 10 having a pitch of about 2 mm is provided. The film protection cover plate 11 is made of a polyethylene plate having a thickness of about 3 to 4 mm so as to prevent the breathable waterproof film 9 from being bent or bent excessively, and has rigidity.

The entire peripheral ear portion 8 of the breathable waterproof film 9 is sandwiched in advance by the thin spacer rings 8a, 8a and fixed to form an edging ring. In this fixing work, the waterproof film 9 is allowed to have some space, so that the waterproof film 9 is not broken. Further, since high-frequency heat welding is used for this fixing, the work can be facilitated. An adhesive may be used to bond the spacer rings 8a, 8a to the front member 2 and the film protection cover plate 11, but heat welding may be used.

Since the bag 1 is provided with the elliptical window 6 as described above, the radio (not shown) contained in the bag 1 is waterproof but does not deteriorate its sound quality. In particular, this breathable waterproof film 9 is used for the front member 2 and the film protection cover plate 11.
Between the spacer ring 8a and the spacer ring 8a, the curtain vibrates acoustically within the thickness range of the spacers 8a, 8a, so that the sound quality is not deteriorated.

Next, a second embodiment will be described. The present embodiment is a waterproof type radio housing composed of a polyethylene plate body 20 having a thickness of about 2 mm, and a window 21 is provided in the radio housing, and the window 21 has an air-permeable ultrathin waterproof structure. The film 9 is provided. Therefore, the window 21 is opened at the speaker (not shown) of the portable radio.

That is, in FIG. 3, FIG. 4 and FIG. 5, the window 21 in the plate member 20 has a circular shape of approximately 65 mmφ, and a large number of horizontal slits 22, 22, ... Are provided in this window zone. It is provided with a pitch of about 2 mm. As shown in FIG. 3, the slit 22 is formed in a zigzag cross section to prevent water from entering as much as possible. Around the window zone, a mounting fin 23 is provided outwardly, and a breathable waterproof film 9 having an edge ring is provided on the mounting fin 23. A film protection cover plate 24 is provided on the edge ring of the waterproof film 9.

The film protection cover plate 24 is formed into a circular shape which is substantially the same as the window zone, and is provided with a large number of horizontal slits 25, 25 ... Four mounting seats 26 are extended on the film protection cover plate 24, and these mounting seats 26 are screwed to bosses 28 provided on the plate body 20 with screws 27.

Since the window 21 of the radio housing is provided with the breathable waterproof film 9 having the above-mentioned edging ring, it is waterproof even if rain water is splashed on the portable radio, and the sound quality thereof is not deteriorated. However, the breathable waterproof film 9 is not damaged during the installation work of the waterproof film 9 or the use of the radio.

Next, a specific example of the breathable waterproof film 9 described above will be described. This waterproof film 9 is disclosed in Japanese Utility Model Publication No. 1-23022 and Japanese Utility Model Laid-Open No. 62-3188.
In addition to those shown in Japanese Patent Publication, the following may be used.

That is, the thickness is 12.5 μm, the strength is vertical ×
Horizontal = 320 x 320 kg / cm ² , moisture permeability 4.5 g / m ² ·
Day, JIS protection grade 8 Ultra-thin PTFE film of underwater type or more, thickness 25 μm, pore diameter 0.6 μm, porosity 85
%, Strength vertical × horizontal = 3.5 kg / cm × 0.5 kg / cm, moisture permeability 7,200 g / m ² · day, JIS protection class 7 moisture resistant type PO-based non-woven fabric may be used.

The term "waterproof case" used in this specification includes not only a rigid plastic casing but also a flexible plastic film bag. Also, "portable" includes not only portable sound generators but also small items such as buzzers.

[0022]

According to the present invention, a breathable waterproof film is provided on the outer surface side of the porous window zone of the waterproof case body, and the porous film protection is provided on the outer surface side of the waterproof film. Since a cover plate is provided and an edging ring sandwiched by a pair of spacer rings is provided at the entire ear portion of the waterproof film, it is an extremely thin waterproof film with low mechanical strength that allows ventilation. It is possible to prevent damage during film mounting work and use of audio equipment. Moreover, since the film curtain vibration due to the sound is allowed by the thickness of the pair of spacer rings, the deterioration of the sound quality of the audio equipment can be prevented. Furthermore, since it is composed of a waterproof case body, a waterproof film sandwiched between spacers having a thickness that allows curtain vibration, and a film protective cover plate, the overall thickness dimension is not increased, It is convenient for small sound generators.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a second embodiment of the present invention, which corresponds to the main part of FIG.

FIG. 4 is a side view taken along the arrow a in FIG.

5A is a side view as seen from the arrow b in FIG. 3, and FIG.
FIG. 13 is a sectional view taken along the arrow c in FIG.

[Explanation of symbols]

1 ... Bag, 6 ... Window, 7, 10 ... Pores, 8 ... Ears, 8a, 8
a ... Spacer, 9 ... Waterproof film, 11, 24 ...
Film protection cover plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Open 55-144472 (JP, U) Open 58-43079 (JP, U) Open 62-3188 (JP, U) Open 62- 37467 (JP, U) Actual opening 5-4699 (JP, U) Actual opening Flat 6-81188 (JP, U) Actual opening Sho 53-147812 (JP, U) Actual opening Sho 59-143131 (JP, U) Actual development Sho 59-193081 (JP, U)

Claims (1)

(57) [Claims] 1. A window case of a waterproof case for accommodating a sound generating device is provided with perforations, and a breathable ultra-thin waterproof film is provided on the outer surface side of the window zone, and the outer surface of the waterproof film. A film protective cover that is porous and has rigidity on the side
In a waterproof case provided with a plate, heat is applied by sandwiching the perimeter ears of the breathable ultra-thin waterproof film with a pair of thin-walled spacers having substantially the same shape as the outer shape of the window zone. A portable waterproof case for a small sound generating device, characterized in that the thin spacer ring is welded and fixed between the waterproof case and the film protective cover plate.