JP2004319548A - Drainage mechanism of pressure regulating membrane - Google Patents

Abstract

An object of the present invention is to quickly recover from an internal pressure regulation dysfunction caused by covering a pressure regulating membrane with water.
A cover (18) is attached to a housing (10) so as to cover an opening (12), and an arc-shaped portion (16a) formed on the circumference concentric with the opening (12) is provided between the opening (12) and the cover (18). The cover 18 is formed at a position facing the groove edge portion 16c so as to be in contact with the arc-shaped portion 16a, and communicates with a gap 20 formed at an appropriate interval between the housing 10 and the cover 18. A groove 16 having an opening 16b is formed.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drainage mechanism for a pressure regulating membrane in a communication device having a waterproof function.
[0002]
[Prior art]
Many conventional portable terminals have a waterproof function so that they can be used in any environment. An example is shown below.
[0003]
For example, a waterproof film is provided inside the device case to cover the through hole for sound so as to cover the through hole, and a protective member having air permeability is provided inside the waterproof film to regulate deformation of the waterproof film. (For example, see Patent Document 1).
[0004]
In addition, a case is provided with a waterproof film that closes a sound emission hole formed in a case, and a case in which a cover having a curved surface portion that bulges outward to cover the sound emission hole is attached to the case (for example, Patent Reference 2).
[0005]
In addition, two O-rings mainly composed of a rubber material having good oil resistance are arranged, and an oil material excellent in heat resistance, cold resistance and resistance to moisture and moisture is injected and filled between them to form a sandwich structure. In some cases, waterproof performance and moisture-proof performance are maintained for a long period of time (for example, see Patent Document 3).
[0006]
In addition, a sheet made of rubber such as silicon material blocks liquid or dust such as water from entering the electric circuit panel with switches from between the key buttons made of resin or rubber and the key panel on the top of the equipment case. (For example, see Patent Document 4).
[0007]
If the internal pressure fluctuates due to changes in air temperature, the diaphragm of acoustic components (mainly speakers) will be deformed by pressure, and will not operate properly, causing communication failures. I do. For this reason, in order to satisfy the waterproof function while preventing the functional failure of the device due to the fluctuation of the internal pressure, a method of providing a pressure regulating film having air permeability and water impermeability in the opening hole formed in the device is generally adopted.
[0008]
[Patent Document 1]
JP 2001-128272 A (Abstract)
[Patent Document 2]
JP-A-2002-016374 (abstract)
[Patent Document 3]
JP-A-2002-039390 (abstract)
[Patent Document 4]
JP 2001-043768 A (abstract)
[0009]
[Problems to be solved by the invention]
However, in the conventional device, if the pressure regulating film is covered with water, the flow of air is hindered, and the internal pressure adjustment does not function. For this reason, immediately after picking up the device after submersion accompanied by a rapid change in temperature, fluctuations in the internal pressure and a malfunction of the pressure regulating film occur simultaneously, and as a result, a communication failure of the device may occur. This communication failure does not recover until the water covering the pressure regulating membrane dries or is artificially removed.Therefore, communication equipment mainly used in emergency situations such as disasters and fires, such as police and fire departments, has a communication failure. The phenomenon that it takes time to recover the function later can be a serious problem.
[0010]
The present invention has been made in order to solve the conventional problems as described above, and is used for a portable terminal having a waterproof function, and has a drainage structure using surface tension and mechanical protection of a pressure regulating membrane. It is another object of the present invention to provide a drainage mechanism for a pressure-regulating membrane that realizes a quick recovery from an internal pressure adjustment dysfunction caused by covering the pressure-regulating membrane with water.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a drainage mechanism for a pressure-regulating film that is attached to an opening formed in a housing to adjust the internal pressure of equipment. A cover is attached to the cover, and between the opening and the cover, there is an arc-shaped portion formed on the circumference concentric with the opening, so that the cover comes into contact with an appropriately spaced gap. And a groove formed at a position facing the arc-shaped portion and communicating with an appropriately spaced gap formed between the housing and the cover. It is characterized by the following.
[0012]
Further, in the drainage mechanism for a pressure-regulating membrane according to the present invention, the circumference of the opening hole is provided with a slope having a diameter that is increased with an inclination toward the outside of the housing.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is an external view, and FIG. 3 is a sectional view taken along line 3-3 in FIG.
[0014]
An opening 12 for ventilation is formed in the housing 10, and the circumference of the opening 12 is provided with a slope 12 a whose diameter increases with an inclination toward the outside of the housing 10. The slope 12a allows the water that has entered the opening hole 12 to be efficiently drained out of the opening hole 12 by surface tension described below.
[0015]
A pressure regulating film 14 for adjusting the internal pressure of the device is adhered and fixed to the opening 12 from the inside of the housing 10 by a supporter such as a double-sided tape or rubber.
[0016]
The housing 10 includes a groove edge portion 16c having an arc-shaped portion 16a formed on the circumference concentric with the opening hole 12, and an opening portion 16b formed at a position facing the arc-shaped portion 16a. A substantially U-shaped U-shaped groove 16 is formed, and a cover 18 is attached to the housing 10 so as to cover the entire U-shaped groove 16 including the opening hole 12.
[0017]
The cover 18 has a gap 20 communicating with the outside at a position communicating with the opening 16b of the U-shaped groove 16 between the housing 18 and the cover 18 and is in contact with the groove edge portion 16c with an appropriate gap. It is arranged as follows.
[0018]
As described above, since the cover 18 and the groove edge portion 16c are disposed so as to be in contact with an appropriate gap, surface tension acts between the cover 18 and the groove edge portion 16c. It is possible to suck out the water that has entered the outside.
[0019]
Further, by forming the arc-shaped portion 16a concentric with the opening hole 12 in the groove edge portion 16c, surface tension acting between the cover 18 and the cover 18 can be generated on the circumference concentric with the opening hole 12, The surface tension acts evenly on the opening holes 12, and water can be effectively sucked out.
[0020]
Furthermore, by providing the gap 20, the surface tension of the water near the opening 16b can be reduced, so that the water near the opening 16b can be drained first, and after the draining, the U-shaped groove is formed. Air can be pumped into 16.
[0021]
Next, the operation will be described based on FIGS. 5, 6, 7 (a), 7 (b), (c), (d), (e), and FIG. I do. The hatching in FIGS. 5, 6, 7A, 7B, 7C, 7D, and 7E and FIG. 8 indicates water, and the cover 18 is not shown.
[0022]
As shown in FIG. 5, immediately after the device is pulled out of the water, the water has penetrated the entire inside of the cover 18.
First, as shown in FIG. 6, since the surface tension of the water near the opening 16b is weakened by the gap 20 (the same applies to FIG. 3 and thereafter), the water near the opening 16b passes through the gap 20 to cover (Refer to FIG. 3 and the same below.)
Next, as shown in FIG. 7A, air enters into the U-shaped groove 16 from the opening 16b through the gap 20, and at the same time, the surface acting between the cover 18 and the groove edge 16c. The water in the U-shaped groove 16 is sucked out in the direction indicated by the arrow in FIG. At this time, since surface tension is generated between the cover 18 and the arcuate portion 16a on the circumference concentric with the opening hole 12, the surface tension acts evenly on the opening hole 12, and Water is efficiently drained along the slope 12a. Thereafter, the air that enters the U-shaped groove 16 from the opening 16b through the gap 20 increases in the order shown in FIGS. 7 (b), (c), (d) and (e). Water in the U-shaped groove 16 is sucked out in the direction shown by the arrow.
Finally, as shown in FIG. 8, the water in the opening hole 12 and the U-shaped groove 16 is completely sucked out, and the drainage is completed.
[0023]
Although the U-shaped groove 16 is formed in the housing 10 in the above embodiment, it may be provided in the cover 18.
[0024]
The direction of the U-shaped groove 16 is not limited to the above-described embodiment, and may be provided in any direction as long as the opening 16b of the U-shaped groove 16 and the gap 20 communicate with each other and are arranged at the same position. May be.
[0025]
【The invention's effect】
As described above, according to the present invention (claim 1), when the device is submerged and pulled up from the water, the water near the opening whose surface tension has been weakened by the gap is first drained from the gap, and then, Water in the groove is sucked out by the air sent into the groove from the opening through the gap and the surface tension acting between the cover and the groove edge, and an arc shape formed on the concentric circle with the opening hole The surface tension acts evenly on the opening hole by the function of the portion, and the water in the opening hole is sucked out, so that the water is quickly removed from the pressure regulating film.
Thereby, it is possible to prevent the malfunction of the pressure regulating film due to the stagnation of water and to quickly recover from the communication malfunction. Further, even in a severe environment where submergence or the like is conceivable, it is possible to use the device stably even in an emergency without causing a long-term communication failure.
Further, since the pressure regulating film is completely covered by the cover, mechanical damage to the pressure regulating film can be prevented.
[0026]
Further, according to the present invention (claim 2), by forming a slope having a diameter that increases as it goes toward the outside of the housing on the circumference of the opening hole, when surface tension acts on the opening hole. In addition, water can be efficiently drained from the opening hole.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of the present invention.
FIG. 2 is an external view of the embodiment of the present invention.
FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
FIG. 4 is a front view of a housing.
FIG. 5 is a diagram showing a state of a part A in FIG. 4 immediately after the device is lifted by itself.
FIG. 6 is a diagram showing a state of part A in FIG. 4 in which water near an opening is drained.
FIG. 7A is a view showing a state of a portion A in FIG. 4 in which air enters the groove from the opening and water in the groove is sucked out.
(B) It is a figure which shows the mode of the A section of FIG. 4 where time has passed since (a).
FIG. 5C is a diagram illustrating a state of the part A in FIG. 4 after a lapse of time from FIG.
FIG. 5D is a diagram illustrating a state of a part A in FIG. 4 in which time has elapsed from (c).
5 (e) and 5 (d) are views showing states of the portion A in FIG. 4 after a lapse of time.
FIG. 8 is a view showing a state of a part A in FIG. 4 in which drainage in the groove is completed.
[Explanation of symbols]
10 Housing 12 Opening hole 12a Slope 14 Pressure regulating film 16 U-shaped groove (groove)
16a Arc-shaped portion 16b Opening 16c Groove edge 18 Cover 20 Clearance

Claims (2)

In the drainage mechanism of the pressure regulating film attached to adjust the internal pressure of the device in the opening hole formed in the housing,
A cover is attached to the housing so as to cover the opening hole,
A groove edge portion having an arcuate portion formed on the circumference concentric with the opening hole between the opening hole and the cover, and the cover being disposed so as to be in contact with a gap at an appropriate interval; And a groove formed at a position facing the arcuate portion and having an opening communicating with a suitably spaced gap formed between the housing and the cover. Drainage mechanism. 2. The drainage mechanism for a pressure regulating film according to claim 1, wherein the circumference of the opening has a slope having a diameter that increases as it goes to the outside of the housing.

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