JP4550993B2 - Sound emission structure of buzzer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound emission structure of a buzzer for performing an alarm or the like in a fire receiving panel or the like, and more particularly to a sound emission structure of a buzzer characterized by a structure for improving the sound pressure of the buzzer.
[0002]
[Prior art]
Today, various buzzers are widely used in various fields for alarming. For example, a buzzer is also provided in a fire receiving panel that monitors a signal from a fire detector for detecting a fire.
Since such a buzzer is often housed inside the housing, it is necessary to provide a sound emitting structure for emitting the sound of the buzzer to the outside of the housing.
As this sound emitting structure, a structure in which a plurality of acoustic holes are provided at the front center position of the buzzer in the housing is the most common.
[0003]
Here, regarding the buzzer for the purpose of fire notification, it is obliged to ensure a sound pressure of a certain value or more (specifically, a sound pressure of 85 dB or more) under the Fire Service Law.
However, a single-frequency buzzer is increasingly used to reduce the equipment cost, and such a buzzer has a weak resistance to the surrounding environment, so that the sound pressure varies greatly depending on the surrounding environment. There is a problem.
[0004]
In order to solve such a problem, the following structures have been proposed conventionally.
First, the structure using the Helmholtz resonance effect can be mentioned. In this structure, the sound pressure can be improved by providing a radial resonance wall in front of the buzzer.
Alternatively, a structure for expanding the sound emission path, for example, increasing the number of acoustic holes, increasing the number of acoustic holes, or providing a slit or the like on the side surface of the housing may be considered.
[0005]
[Problems to be solved by the invention]
However, in a structure using the resonance effect of Helmholtz, a large space is required around the buzzer to provide a radial resonance wall, and this structure is adopted in the present day when miniaturization of equipment advances. It is difficult.
In addition, a structure that widens the sound emission path is difficult to adopt because it reduces all of the insectproof, waterproof, crime prevention, and structural strength.
[0006]
The present invention has been made in view of the above problems, and an object thereof is to provide a sound emitting structure for a buzzer that can improve the sound pressure of the buzzer in a small space without causing various performance degradations. And
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the sound emitting structure for a buzzer according to claim 1 is for emitting sound of the buzzer to the outside of the housing in a housing containing a substantially circular buzzer in front . A sound emitting structure of a buzzer configured by providing a plurality of acoustic hole groups composed of a plurality of acoustic holes, wherein the plurality of acoustic hole groups are discontinuous with each other in the radial direction of the buzzer and the circumferential direction of the buzzer. placed in position, a portion of the plurality of acoustic holes included in each of the acoustic hole groups, in the housing, in the area corresponding to the annular region having a constant width around the outer edge of the buzzer, the buzzer It is provided so as to face the outer edge .
[0008]
According to this structure, the acoustic hole is provided in the front peripheral area where the sound pressure of the buzzer is the highest, and the sound is resonated and emitted in the internal space of the operation panel, so that the sound pressure of the buzzer can be amplified. . In particular, in this case, since the diameter and number of the acoustic holes can be configured in the same manner as in the prior art, none of the insectproof property, waterproof property, crime prevention property, and structural strength is reduced.
[0009]
The buzzer sound emitting structure according to claim 2 is the buzzer sound emitting structure according to claim 1, wherein the plurality of acoustic holes of each of the acoustic hole groups reach a position corresponding to an outer edge of the buzzer. It is characterized by having a large diameter. The buzzer sound emitting structure according to claim 3 is the buzzer sound emitting structure according to claim 1, wherein the plurality of acoustic holes of each of the acoustic hole groups reach a position corresponding to an outer edge of the buzzer. It is characterized by a small diameter.
[0010]
According to this structure, the most efficient sound emission can be performed at each position by changing the diameter of the acoustic hole in accordance with the distribution of the sound pressure. Further, when the acoustic hole close to the front peripheral position has a small diameter and the acoustic hole far from the front peripheral position has a large diameter, sound can be emitted with a uniform sound pressure as a whole.
[0011]
The sound emitting structure for a buzzer according to claim 4 is the sound emitting structure for a buzzer according to any one of claims 1 to 3, wherein all of the plurality of acoustic holes in each of the acoustic hole groups are arranged on the buzzer. It was provided only at a position corresponding to an annular region having a constant width centered on the outer edge.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a sound emitting structure for a buzzer according to the present invention will be described below in detail with reference to the drawings. In this embodiment, an example will be described in which this structure is provided in a fire receiving panel that monitors a signal from a fire detector for detecting a fire. In addition, this invention is not limited by this embodiment.
[0018]
(Embodiment 1)
First, the first embodiment will be described.
This form generally relates to a sound emitting structure of a buzzer in which an acoustic hole is provided at the front peripheral position of the buzzer.
A general perspective view of a fire receiving panel to which this structure is applied is shown in FIG. 1, a front view is shown in FIG. 2 (a), and a vertical sectional view taken along the line AA is shown in FIG. 2 (b).
[0019]
As shown in FIGS. 1 and 2, the fire receiving panel 1 includes a substrate 3 and a buzzer 4 having a substantially circular front shape inside a substantially rectangular housing 2.
Among these, the door part 5 is provided in the front of the housing | casing 2 so that opening and closing is possible, and the various indicator lamps 6 and the operation switch 7 are provided in this door part 5. FIG.
The substrate 3 is provided with a control unit (not shown). The control unit is configured such that the indicator lamp 6 and the operation switch 7 are electrically connected to the substrate 3, and the operation switch 7 is operated. Based on a signal, a signal from a fire detector (not shown), etc., the indicator lamp 6 is controlled and the buzzer is turned on / off.
The buzzer 4 is a single frequency buzzer, is formed in a substantially circular front, is electrically connected to the substrate 3, and is turned on / off by the control of the control unit.
[0020]
Here, the door portion 5 of the housing 2 is provided with a plurality of acoustic holes 10. Each of these acoustic holes 10 is formed so as to penetrate through the housing 2 as clearly shown in FIG. 2B, and emits sound emitted from the buzzer 4 to the outside of the housing 2. .
In particular, these acoustic holes 10 are provided at positions around the four front faces of the buzzer. The position of the acoustic hole 10 corresponds to the position with the highest sound pressure.
[0021]
Hereinafter, the positional relationship of the sound pressure will be described. FIG. 3 is a conceptual diagram showing the relative positional relationship between the buzzer 4 and sound. FIG. 3 shows an outer shape S1 of the buzzer 4, a front peripheral region E1 formed in an annular shape with a constant width around the outer shape S1, and an inner region E2 and an outer region E3 with respect to the front peripheral region E1. Yes. Here, it is generally considered that the sound pressure is highest in the inner region E2 close to the center of the buzzer 4, but according to the experiment by the applicant, the sound pressure is highest in the front peripheral region E1. was gotten.
[0022]
Therefore, in the present embodiment, as shown in FIGS. 1 and 2, the sound pressure of the buzzer 4 is improved by providing the acoustic hole 10 at a position corresponding to the front peripheral region E1.
However, it is not always necessary to arrange all the acoustic holes 10 in the front peripheral area E1, and if at least a part of the acoustic holes 10 is arranged in the front peripheral area E1, a sound pressure improvement effect can be obtained.
[0023]
Further, in the present embodiment, a plurality of acoustic holes 10 are distributed and arranged for each plurality. That is, as shown in FIGS. 1 and 2, the plurality of acoustic holes 10 are divided into a first group of acoustic holes 10 </ b> A and a second group of acoustic holes 10 </ b> B that are arranged in parallel at a certain distance from side to side. Is distributed. Each of the acoustic holes 10A and 10B of each group is arranged in the front peripheral region E1, and the sound pressure improvement effect can be efficiently obtained.
In the present embodiment, the first group and the second group are arranged side by side, but this is in balance with the fact that there are indicator lights 6 and operation switches 7 above and below the buzzer. As a result, when it is not necessary to take such consideration into consideration, it may be distributed in any direction of the front peripheral area E1.
[0024]
Moreover, in this Embodiment, each acoustic hole 10A, 10B of the 1st group and the 2nd group is made large diameter shape as it reaches the front peripheral position of the said buzzer. For example, in FIG. 2A, among the acoustic holes 10A of the first group, the acoustic hole 10A1 closest to the front peripheral position is formed with a larger diameter than the acoustic hole 10A2 farthest from the front peripheral position. Yes. Thus, the most efficient sound emission can be performed at each position by changing the diameter of the acoustic hole 10 corresponding to the distribution of the sound pressure. However, conversely, the sound hole 10A1 close to the front around the position in the small-diameter, by the distant sound hole 10A2 from the front peripheral position in the large diameter, Ru can also this to perform sound emission at a uniform sound pressure as a whole. In addition, although the maximum diameter of the acoustic hole 10 is arbitrary, it is determined so that waterproofness, insectproof property, crime prevention property, and structural strength are not reduced.
[0025]
(Embodiment 2)
Next, a second embodiment will be described.
This embodiment generally relates to a sound emission structure of a buzzer in which a hollow cylindrical sound emission auxiliary body is provided around the outside of an acoustic hole.
FIG. 4 is an overall perspective view of a fire receiving panel to which this structure is applied, FIG. 5A is a front view, and FIG. 5B is a longitudinal sectional view taken along the line BB.
In the present embodiment, structures that are not particularly described are the same as those in the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.
[0026]
As shown in FIGS. 4 and 5, a plurality of acoustic holes 20 are provided in the door portion 5 of the housing 2 of the fire receiving board 1. Unlike the acoustic hole of the first embodiment, the acoustic hole 20 is provided in the inner region E2 of the buzzer 4.
A sound emission assisting body 30 is provided on the outer surface of the door portion 5. The sound emission assisting body 30 is formed in a hollow cylindrical shape from the acoustic hole 20 side to the outside as shown in the figure, and is formed so that substantially all of the plurality of acoustic holes 20 are accommodated in the inner diameter thereof. .
Therefore, the sound emitted radially through the acoustic hole 20 enters the sound emission assisting body 30, resonates inside the sound emission assisting body 30, and is emitted to the outside. The sound is amplified during the resonance, and the sound pressure is improved.
[0027]
As shown in FIG. 5B, the protruding length L1 of the sound emission assisting body 30 can be determined in consideration of the sound pressure amplification effect, the installation space of the fire receiving board 1, and the like. In particular, the housing 2 is provided with a recess 2a having a recess length L2, and the door 5 is disposed in the recess 2a. More preferably, the sound emission assisting body 30 is formed such that the protruding length L1 is substantially equal to the recess length L2. For this reason, the sound emission assisting body 30 can be maximized in a range not protruding from the fire receiving board, and the sound pressure amplification effect can be maximized.
[0028]
Note that the sound emission assisting body 30 does not necessarily have the shape as illustrated, and may be formed in a slightly radial shape, for example. Further, the number is not limited to one. For example, when there are acoustic holes distributed in a plurality of groups as in the first embodiment, the sound emission assisting body 30 may be provided for each group. .
[0029]
(Embodiment 3)
Finally, Embodiment 3 will be described.
This embodiment generally relates to a sound emission structure of a buzzer in which a table-like sound emission auxiliary body is provided around the outside of an acoustic hole.
FIG. 6 is an overall perspective view of a fire receiving panel to which this structure is applied, FIG. 7A is a front view, and FIG. 7B is a longitudinal sectional view taken along the line CC.
In the present embodiment, structures that are not particularly described are the same as those in the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.
[0030]
As shown in FIGS. 6 and 7, a plurality of acoustic holes 40 are provided in the door portion 5 of the housing 2 of the fire receiving board 1. Unlike the acoustic hole of the first embodiment, the acoustic hole 40 is provided in the inner region E2 of the buzzer 4.
A sound emission assisting body 50 is provided on the outer surface of the door portion 5. As shown in the figure, the sound emission assisting body 50 includes a main plate 51 and a plurality of support legs 52. Among these, the main plate 51 is formed in a circular plate shape substantially along the door portion 5, and is formed so that substantially all of the plurality of acoustic holes 40 are accommodated in the inner diameter thereof. Each support leg 52 is erected outward from the door 5 to support the main plate 51. Since the plurality of support legs 52 are arranged at a predetermined distance from each other, the sound emitted through the acoustic hole 40 resonates between the main plate 51 and the operation panel (door portion 5). Thus, sound is emitted to the outside through the plurality of support legs 52. The sound is amplified during the resonance, and the sound pressure is improved.
[0031]
As shown in FIG. 7B, the protruding length L3 of the sound emission assisting body 50 can be determined in consideration of the sound pressure amplification effect, the installation space of the fire receiving board 1, and the like. More preferably, the sound emission assisting body 50 is formed such that the protruding length L3 is substantially equal to the recess length L2. For this reason, the sound emission assisting body 50 can be maximized when it does not protrude from the fire receiving board 1, and the sound pressure amplification effect can be maximized.
[0032]
The sound emission assisting body 50 does not necessarily have the shape as shown in the figure. For example, the main plate 51 can be formed in a rectangular plate shape. Further, the number is not limited to one. For example, when the acoustic holes 40 are distributed and arranged in a plurality of groups as in the first embodiment, a sound emission assisting body 50 is provided for each group. Also good.
[0033]
(Other embodiments)
Although the embodiments of the present invention have been described so far, the present invention can be applied to various different embodiments in addition to the above-described embodiments within the scope of the technical idea described in the claims. May be implemented.
For example, in the above embodiment, the sound emission structure of the buzzer 4 provided in the fire receiving panel 1 has been described as an example, but this structure is a sound emission structure of a buzzer installed at an arbitrary place for an arbitrary purpose. Is something that can be applied. Further, the present invention is not limited to the single-frequency buzzer 4 and can be similarly applied as a sound emission structure of an arbitrary type of buzzer.
The specific names, shapes, structures, combinations, materials, and quantities shown in the documents and drawings can be arbitrarily changed unless otherwise specified.
[0034]
【The invention's effect】
As described above, according to the present invention, the acoustic hole is provided in the front peripheral region where the sound pressure of the buzzer is the highest, and the sound is emitted in resonance with the internal space of the operation panel. The pressure can be amplified. In particular, in this case, since the diameter and number of the acoustic holes can be configured in the same manner as in the prior art, none of the insectproof property, waterproof property, crime prevention property, and structural strength is reduced.
[0035]
Further, according to the present invention, the most efficient sound emission can be performed at each position by changing the aperture of the acoustic hole corresponding to the distribution of the sound pressure. Further, when the acoustic hole close to the front peripheral position has a small diameter and the acoustic hole far from the front peripheral position has a large diameter, sound can be emitted with a uniform sound pressure as a whole.
[0036]
In addition, according to the present invention, the sound emitted through the acoustic hole is amplified by the sound emission assisting body, so that the sound pressure is improved. In particular, in this case, since the diameter and number of the acoustic holes can be configured in the same manner as in the prior art, none of the insectproof property, waterproof property, crime prevention property, and structural strength is reduced.
[0037]
Further, according to the present invention, the sound emitted radially through the acoustic hole enters the inside of the sound emission auxiliary body, resonates inside the sound emission auxiliary body, and is emitted outside. . The sound is amplified during the resonance, and the sound pressure is improved.
[0038]
Further, according to the present invention, the sound emitted through the acoustic hole resonates between the main plate and the operation panel, and is emitted to the outside through the plurality of support legs. The sound is amplified during the resonance, and the sound pressure is improved.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a fire receiving panel to which a sound emitting structure of a buzzer according to Embodiment 1 of the present invention is applied.
2A is a front view of a fire receiving board, and FIG. 2B is a vertical cross-sectional view taken along line AA in FIG.
FIG. 3 is a conceptual diagram showing a relative positional relationship between a buzzer and a sound.
FIG. 4 is an overall perspective view of a fire receiving panel to which a sound emitting structure of a buzzer according to Embodiment 2 of the present invention is applied.
5A is a front view of a fire receiving board, and FIG. 5B is a vertical cross-sectional view taken along the line BB in FIG. 5A.
FIG. 6 is an overall perspective view of a fire receiving panel to which a sound emitting structure of a buzzer according to a third embodiment of the present invention is applied.
7A is a front view of a fire receiving board, and FIG. 7B is a longitudinal sectional view taken along the line CC of FIG. 7A.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fire receiving board 2 Case 2a Recess 3 Substrate 4 Buzzer 5 Door 6 Indicator lamp 7 Operation switch 10, 20, 40 Sound hole 30, 50 Sound emission auxiliary body 51 Main plate 52 Support leg

Claims (4)

A buzzer sound emission structure that is configured by providing a plurality of acoustic hole groups consisting of a plurality of acoustic holes for emitting sound of the buzzer to the outside of the casing in a casing containing a buzzer on the front surface. There,
The plurality of acoustic hole groups are arranged at positions discontinuous with each other in the radial direction of the buzzer and the circumferential direction of the buzzer,
A part of the plurality of acoustic holes included in each acoustic hole group is opposed to the outer edge of the buzzer in a region corresponding to an annular region having a constant width around the outer edge of the buzzer in the housing. It is provided so as,
Buzzer sound emission structure characterized by The plurality of acoustic holes in each of the acoustic hole groups has a large diameter as it reaches a position corresponding to the outer edge of the buzzer,
The sound emitting structure for a buzzer according to claim 1. A plurality of acoustic holes in each acoustic hole group having a small diameter as it reaches a position corresponding to the outer edge of the buzzer;
The sound emitting structure for a buzzer according to claim 1. All of the plurality of acoustic holes of each of the acoustic hole groups are provided only at positions corresponding to an annular region having a constant width centered on the outer edge of the buzzer.
The sound emission structure of a buzzer according to any one of claims 1 to 3.

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