JP4075595B2 - Sound emission structure of the housing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound emitting part structure of a housing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when an electronic device is provided with a waterproof function in a device body, it is common to prevent water from entering the housing with a sealed structure. On the other hand, in the case of electronic devices with built-in sound source parts such as speakers and buzzers, a large number of small-diameter sound holes that allow sound to pass are provided in a part of the housing that covers the speakers. As a result, the volume of sound and alarm sound during use is secured. Therefore, waterproofing cannot be ensured for the sound emitting portion provided with a large number of such sound emitting holes by the sealing structure.
[0003]
As a countermeasure for this, a method of providing a waterproof film made of ethylene tetrafluoride or a porous film having a function of allowing sound to pass through a large number of micron holes while having a waterproof function on the inner surface of the sound emitting part of the housing Is known (see Patent Document 1 below). Apart from this, in electronic devices that require higher waterproof performance, such as bathroom radios and televisions, water intrusion into the sound emission part of the housing is allowed and the speakers themselves are waterproof. The use of parts having performance is also performed.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-149447 (refer to paragraph “0004”, FIGS. 2 and 3)
[0005]
[Problems to be solved by the invention]
However, as described above, when a sound source component having waterproof performance is used, there are the following problems. That is, although it is permissible for water to enter the sound emitting portion of the housing, the opening diameter of the sound emitting hole needs to be reduced to some extent in order to prevent intrusion of foreign matter or the like. Therefore, when water is applied to the sound emission part, the water adhering to the sound emission hole stops there due to surface tension, so that the sound emission hole remains blocked with water. There is a problem that the sound quality is deteriorated as the volume of the sound emitted from the sound decreases.
[0006]
The present invention has been made in view of such a conventional problem, and a housing capable of securing good acoustic performance during use in an electronic device having a built-in sound source component such as a speaker and waterproof performance. It aims at providing the sound emission part structure of a body.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1, at least one side of the outer side or the inner side of the casing in the casing in which the sound emitting hole through which the sound emitted by the sound source component housed therein passes is opened. A predetermined roughness for reducing the interfacial tension with water was secured around the sound emitting hole on the surface.
[0008]
In such a configuration, by improving the hydrophilicity around the sound emitting hole, it is possible to prevent water adhering to the sound emitting hole from being stopped by the surface tension.
[0009]
In the invention of claim 2, a predetermined roughness is secured on the inner peripheral surface of the sound emitting hole.
[0010]
In such a configuration, by improving the hydrophilicity on the inner peripheral surface of the sound emitting hole, it is possible to more reliably prevent water adhering to the sound emitting hole from being stopped by the surface tension.
[0011]
In the invention of claim 3, the predetermined roughness is secured by blasting.
[0014]
In the invention according to claim 4, a notch portion in which a part of the opening edge of the sound emitting hole is notched is formed on the surface of the one side of the casing .
[0015]
In such a configuration, water that stops in the sound emission hole can be released from the notch to the periphery of the sound emission hole, and water can be more reliably prevented from stopping in the sound emission hole.
[0016]
In the invention of claim 5 , the notch is formed on the lower side of the opening edge of the sound emitting hole in the use state of the housing.
[0017]
In such a configuration, it is possible to effectively escape the water that tries to stop in the sound emission hole from the notch portion by gravity in the use state.
[0018]
In the invention of claim 6 , the notch is formed in a pair so as to oppose each other with the sound emitting hole therebetween.
[0019]
In the invention of claim 7 , a guide groove that extends in the vertical direction in use and connects the notch is formed on the surface of the one side of the housing.
[0020]
In such a configuration, even when a large number of sound emitting holes are provided side by side by guiding the water that has escaped from the sound emitting holes to the notch through the guide groove in a predetermined direction, Water that has escaped through the notch can be prevented from temporarily closing other sound emitting holes.
[0021]
In the invention according to claim 8 , the sound emitting hole is provided in a separate member which is attached to the casing and constitutes a part of the casing.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0023]
(First embodiment)
FIG. 1 is a front view of a small waterproof television 1 having a waterproof function according to the first embodiment of the present invention. This waterproof television 1 has a housing 2 in which various electronic components are accommodated, and a cover member 3 constituting a part of the housing 2 can be attached to and detached from the front right side of the housing 2. It is attached.
[0024]
In the waterproof television 1, a liquid crystal display (not shown) is accommodated in the display unit 1 a that is not covered by the cover member 3. The operation portion 1b occupying the upper side in the drawing of the cover member 3 accommodates a plurality of operation buttons 4 exposed on the surface, and the sound emitting portion 1c occupying the lower side in the drawing of the cover member 3 includes A speaker 5 which is a sound source component having a waterproof function is accommodated. Furthermore, the sound emitting portion 1 c is provided with a number of sound emitting holes 6 corresponding to the speakers 5 for allowing sounds emitted from the speakers 5 to pass therethrough. As shown in FIG. 2, the sound emission holes 6 are small round holes having a diameter L of 2 mm, and are arranged at equal intervals vertically and horizontally.
[0025]
On the other hand, the cover member 3 is a molded product made of ABS resin. As shown in FIG. 3, the operation buttons 4 are exposed on the back surface 3a of the cover member 3 in an area corresponding to the operation portion 1b described above. Ribs 8 for reinforcing the periphery of each square hole 7 to be projected are provided. Further, in the region corresponding to the sound emitting portion 1c described above, a guide groove 9 comprising a general portion 9a communicating with the plurality of sound emitting holes 6 arranged in the vertical direction and a terminal portion 9b continuing to the lower end portion thereof. A plurality of lines are formed in parallel with each other. In addition, a drain outlet 10 is provided at the lower end of the cover member 3 for draining water that has entered the outside to the outside.
[0026]
FIG. 4 is a view showing a planar shape and a cross-sectional shape of the general portion 9a of the guide groove 9. As shown in FIG. 4A, the guide groove 9 in the present embodiment is a sound emitting hole 6. Are formed in a U-shaped cross-section (a U-shape opening upward) having the same groove width as the diameter L of each, and each sound emitting hole 6 is opened at the bottom. The terminal portion 9b of the guide groove 9 is composed of a terminal portion 9b that extends downward while gradually decreasing the groove width and depth and disappears in the vicinity of the lower end of the cover member 3.
[0027]
Further, on the back surface 3 a of the cover member 3, after the molding, the rectangular region A that surrounds the plurality of guide grooves 9 and reaches the lower end of the cover member 3 is blasted. As is well known, blasting is a surface treatment in which fine particles of particles are continuously collided (sprayed) on the processing surface to roughen the surface uniformly. A predetermined roughness that reduces the interfacial tension between the groove 9 and the inner peripheral surface 6a (see FIG. 2) of each sound emitting hole 6 is ensured. In the present embodiment, the grain size used for blasting is # 60, and the corresponding roughness is secured in the rectangular area A.
[0028]
In the present embodiment configured as described above, as shown in FIG. 5A, a general area (such as an area corresponding to the operation unit 1b) where the back surface 3a of the cover member 3 is not blasted is provided. In contrast to the smooth surface, as shown in FIG. 4B, the rectangular area A subjected to the blasting is uneven with the projections 11 formed almost uniformly. It is a surface. Therefore, in the rectangular area A, the interfacial tension with water is smaller than in the other general areas, and the size of the attached water droplet W is smaller. In other words, the affinity with water is high.
[0029]
Therefore, when the waterproof television 1 is used in a bathroom or the like, when the water applied to the sound emitting portion 1c adheres to the sound emitting hole 6, the water is prevented from stopping by the surface tension, and at the same time the sound is emitted. It escapes from the hole 6 to the general portion 9a of the guide groove 9, and further smoothly guides to the lower end side of the cover member 3 through the guide groove 9 by its own weight. Therefore, it is possible to avoid a decrease in sound volume and sound quality such as a sound emitted from the speaker 5 due to the sound emission hole 6 being blocked by the attached water, and as a result, it is possible to ensure good acoustic performance. It becomes possible.
[0030]
Further, in the present embodiment, the terminal portion 9b of the guide groove 9 has a shape that extends downward and gradually disappears near the lower end of the cover member 3 while gradually reducing the groove width and depth as described above. The flow of water on the lower end side of the groove 9 is also smooth, and the state where the lower sound emitting hole 6 is temporarily blocked by the water released from the upper sound emitting hole 6 can be immediately resolved. .
[0031]
In the present embodiment, the general portion 9a of the guide groove 9 has a U-shaped cross section, but may be formed in a V-shaped cross section as in the modification shown in FIG. . Moreover, although the groove width of the general portion 9a is the same as the diameter L of the sound emitting hole 6, it may be larger than the diameter L of the sound emitting hole 6 as in the modification shown in FIG. In FIG. 5, the cross-sectional shape may be U-shaped as shown in FIG. 5A or V-shaped as shown in FIG. Furthermore, as in the modification shown in FIG. 7, it may be smaller than the diameter L of the sound emitting hole 6, and even in that case, the cross-sectional shape is U-shaped as shown in FIG. It may be V-shaped as shown in FIG.
[0032]
(Second Embodiment)
[0033]
Next, a second embodiment of the present invention will be described. In the present embodiment, the guide groove 9 is eliminated on the back surface 3a of the cover member 3 described above, and as shown in FIG. 8, a notch 21 is formed by notching a part of the opening edge 6b of each sound emitting hole 6. Formed. In the present embodiment, the opening edge 6b is notched by the notch 21 at a portion located in the direction of 45 ° obliquely downward when the waterproof television 1 is used, and the notch 21 itself is obliquely below 45 °. Has a length in the ° direction. Further, like the guide groove 9 of the first embodiment, the notch 21 is also blasted.
[0034]
Therefore, in the present embodiment, when the waterproof television 1 is used, the water adhering to the sound emission hole 6 does not stop there due to the surface tension and escapes from the sound emission hole 6 to the notch 21. Furthermore, it is possible to smoothly escape to the periphery of the sound emitting hole 6 obliquely downward due to its own weight. Therefore, also in the present embodiment, it is possible to avoid a decrease in sound volume and sound quality such as a sound emitted from the speaker 5 due to the sound emission hole 6 being blocked by the attached water. It is possible to ensure acoustic performance.
[0035]
Moreover, in this Embodiment, the site | part which notches the opening edge 6b of the sound emission hole 6 with the notch part 21 makes a part of 45 degrees diagonally downward, and the shape of the notch part 21 has length. Since the shape is adopted, it is possible to prevent the sound emitting hole 6 located below the sound emitting hole 6 from being temporarily blocked by the water released from the sound emitting hole 6.
[0036]
In addition, as long as the site | part which cuts off the opening edge 6b of the sound emission hole 6 is a part located in the lower side at the time of use of the waterproof television 1, it is good also as a site | part different from this Embodiment. Even in this case, as in the present embodiment, in addition to the surface hydrophilicity being improved by blasting, the water that tries to stop at the sound emitting hole 6 is also removed by the gravity of the water. Can escape around. Furthermore, the portion where the opening edge 6b is cut off does not necessarily have to be located on the lower side. Even in that case, when water adheres to the sound emitting hole 6, it can be suppressed that the water stops there due to surface tension.
[0037]
Further, the shape of the notch 21 is not necessarily a shape having a length, but a shape having a length has an advantage that the direction in which water is allowed to escape from the sound emission hole 6 can be controlled to some extent.
[0038]
(Third embodiment)
[0039]
Next, a third embodiment of the present invention will be described. In the present embodiment, on the back surface 3a of the cover member 3 described above, the notches 21 described in the second embodiment are provided at four locations on the opening edge 6b of the sound emitting hole 6 as shown in FIG. Are arranged evenly.
[0040]
In such a configuration, when water adheres to the sound emitting hole 6 and the water tries to stop there due to surface tension, the shape of the water droplets elongated in four directions due to the presence of the notch portion 21, that is, unstable. It becomes a shape and it becomes difficult to stop there. Therefore, when water adheres to the sound emission hole 6, it can be prevented that the water stops there due to surface tension, and also in this embodiment, the sound emission hole 6 is blocked by the attached water. Therefore, it is possible to avoid a decrease in sound volume and sound quality due to the sound generated by the speaker 5, and as a result, good acoustic performance can be ensured.
[0041]
In the present embodiment, the notches 21 are evenly arranged at the four positions of the opening edge 6 b of the sound emission hole 6, but at least the notches 21 are opposed to each other across the sound emission hole 6. If a pair is formed at a location, as in the present embodiment, when the water adhering to the sound emission hole 6 tries to stop there due to surface tension, it can have an unstable shape. The effects described above can be obtained.
[0042]
(Fourth embodiment)
[0043]
Next, a fourth embodiment of the present invention will be described. In the present embodiment, as shown in FIGS. 10A and 10B, the plurality of notches 21 described in the second embodiment are connected to the back surface 3a of the cover member 3. A guide groove 41 extending in the vertical direction is formed. The details of the guide groove 41 are the same as those of the guide groove 9 described in the first embodiment, and the cross-sectional shape is U-shaped as shown in FIG. 10A, but as shown in FIG. It may be V-shaped, and the groove width is arbitrary.
[0044]
In such a configuration, the water adhering to the sound emission hole 6 is prevented from stopping by the surface tension, and at the same time, the water is released from the sound emission hole 6 through the notch 21 to the guide groove 41, It will be guided to the lower end side of the cover member 3 smoothly. Therefore, the same effect as that of the first embodiment can be obtained.
[0045]
Further, in the present embodiment, unlike the first embodiment, the guide groove 41 does not directly connect the plurality of sound emitting holes 6, and the upper sound emitting holes 6 are notched through the notches 21. Thus, there is an advantage that water released to the guide groove 41 can be prevented from temporarily closing the sound emitting hole 6 on the lower side.
[0046]
In the first to fourth embodiments described above, the guide groove 9, the cutout portion 21, the cutout portion 21 and the guide groove 41 are provided on the back surface 3 a of the cover member 3 separately from the sound emission hole 6. Although what was formed respectively was demonstrated, it is good also as a structure which performs only blasting, without providing them at all. Even in that case, it is possible to prevent the sound emission holes 6 from being blocked by the attached water by improving the affinity with water around each sound emission hole 6, which is good at the time of use. It is possible to ensure a good acoustic performance.
[0047]
In order to obtain the above effect, the blasting may be omitted for the inner peripheral surface 6a of the sound emitting hole 6, and the region to be blasted is limited to the periphery of each sound emitting hole 6. Also good. Further, blasting may be performed on the front surface side of the cover member 3, or may be performed on both the back surface side and the front surface side. However, it is easier to ensure the appearance quality when the blasting is performed only on the back side as in the above-described embodiment.
[0048]
Further, in the above-described embodiment, a predetermined roughness for reducing the interfacial tension with water by blasting the rectangular area A and the inner peripheral surface 6a of the sound emitting hole 6 is ensured. However, a predetermined roughness may be ensured by a method other than blasting. For example, the roughness of the surface of the mold for molding the cover member 3 may be secured in advance.
[0049]
Moreover, although the case where the sound emission hole 6 was a round hole was shown, the sound emission hole 6 may be a square hole or a long hole. Furthermore, although the sound emission hole 6 is provided in the cover member 3, the cover member 3 is not provided and the sound emission hole 6 is provided in the housing. You may make it equip such a housing | casing with the structure similar to a form.
[0050]
Further, although the embodiment in which the sound source component in the present invention is the speaker 5 and there are many sound emission holes 6 has been described, the present invention is not limited to this. For example, the sound source component is a buzzer that generates an alarm sound and the sound emission hole. The present invention can also be adopted for a housing or the like in which only one exists. Even in that case, it is possible to prevent a decrease in sound volume and sound quality deterioration (change in sound quality).
[0051]
【The invention's effect】
As described above, in the first aspect of the invention, by improving the hydrophilicity around the sound emitting hole, it is possible to prevent water adhering to the sound emitting hole from being stopped by the surface tension. did. Therefore, it is possible to ensure good acoustic performance during use in an electronic device having a built-in sound source component such as a speaker and having waterproof performance.
[0052]
Further, in the invention of claim 2, by improving the hydrophilicity on the inner peripheral surface of the sound emitting hole, it is possible to more reliably prevent water adhering to the sound emitting hole from being stopped by the surface tension. I did it. Therefore, the above effect can be made more reliable.
[0053]
Further, in the invention of claim 4 , it is possible to allow water that stops in the sound emission hole to escape from the notch to the periphery of the sound emission hole, and to more reliably prevent water from stopping in the sound emission hole. I was able to do it. Therefore, the above effect can be further ensured.
[0054]
Further, in the invention of claim 5 , in the state of use, the water that tries to stop in the sound emitting hole can be effectively released from the notch portion by gravity. This also makes it possible to further secure the above effect.
[0055]
In the invention of claim 7 , even when a large number of sound emitting holes are provided side by side, the water that has escaped from a sound emitting hole through the notch part temporarily passes through another sound emitting hole. Can be blocked. Therefore, even when a large number of sound emitting holes are provided side by side, the above-described effect can be ensured.
[Brief description of the drawings]
FIG. 1 is a front view of a waterproof television common to each embodiment of the present invention.
FIG. 2 is an external perspective view showing a sound emitting part of the waterproof television.
FIG. 3 is a rear view of a cover member of the waterproof television.
4A is an explanatory view showing a main part on the back surface side of a cover member, and FIG. 4B is an explanatory view showing a modified example thereof.
FIG. 5 is a schematic explanatory view showing the operation of the embodiment.
6 is an explanatory diagram corresponding to FIG. 4 and showing a modification of the embodiment. FIG.
FIG. 7 is an explanatory diagram corresponding to FIG. 4 and showing a modification of the embodiment.
FIG. 8 is an explanatory diagram showing a second embodiment of the present invention.
FIG. 9 is an explanatory diagram showing a third embodiment of the present invention.
FIG. 10 is an explanatory view corresponding to FIG. 4 showing a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waterproof television 1a Display part 1b Operation part 1c Sound emission part 2 Case 3 Cover member 3a Back surface 5 Speaker 6 Sound emission hole 6a Inner peripheral surface 6b Opening edge 9 Guide groove 21 Notch part 41 Guide groove A Rectangular area W Water drop

Claims (8)

A plurality of sound emission holes through which sound emitted by sound source parts housed in the housing passes ,
A guide groove to which the sound emitting hole is connected to at least one of the outer and inner surfaces of the housing; and
In the sound emission part structure having
Ensuring a predetermined roughness to reduce the interfacial tension between water around the sound emitting hole on the one side surface ;
The sound emitting part structure of the housing, wherein the guide groove extends downward while the housing is in use while gradually reducing the groove width and depth in the guide groove.   The sound emitting part structure of the housing according to claim 1, wherein a predetermined roughness is secured on an inner peripheral surface of the sound emitting hole.   The sound emission part structure of the housing according to claim 1 or 2, wherein the predetermined roughness is secured by blasting. The sound emission of the housing according to any one of claims 1 to 3, wherein a notch portion in which a part of an opening edge of the sound emitting hole is cut out is formed on a surface of the one side of the housing. Part structure. The sound emission part structure of the housing | casing of Claim 4 which formed the said notch part in the downward side in the use condition of the housing | casing in the opening edge of the said sound emission hole. The sound emission part structure of the housing according to claim 4, wherein the notch part is formed in a pair so as to face each other with the sound emission hole therebetween. The sound emission of the casing according to claim 4 or 6, wherein a guide groove that extends in a vertical direction in use and connects the notch is formed on a surface of the one side of the casing. Part structure. The sound emission part structure of the case according to claim 1, wherein the sound emission hole is provided in another member constituting a part of the case attached to the case. .

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