JP2021048463A - Alarm unit - Google Patents

Abstract

To provide an inexpensive and lightweight alarm unit capable of improving sound pressure of alarm sound (vibration wave) by reducing attenuation in a period till the alarm sound generated by a sound source is emitted from a sound emission part as much as possible.SOLUTION: An alarm unit 100 includes: a vibration part 10 as a sound source; a main body part 20 where a sound passage to be a propagation passage of a vibration generated by the vibration part 10 is formed; and a sound emission part 50 arranged on a front side of the main body part 20 so as to emit a vibration wave propagated through the sound passage to an external space. The alarm unit includes at least one of a sound emission part shielding plate 36 for covering an opening part of the sound emission part 50 at a position located at a predetermined distance from the opening part of the sound emission part 50 and a reflector 47 formed in parallel with the opening part of the sound emission part 50.SELECTED DRAWING: Figure 2

Description

The present invention relates to an alarm, and more particularly to an electric alarm.

An electric alarm is one of the vehicle safety parts used to call attention to the surroundings. Conventionally, in such an alarm device, in order to increase the sound pressure of the alarm sound emitted from the alarm device, a configuration in which the sound emitting portion is opened on the front side in the traveling direction of the moving body equipped with the alarm device has been adopted. There is. In addition, when the opening is opened in the front side in the traveling direction in this way, a mesh-like shield is used to prevent foreign matter such as water and dust from entering the internal space of the alarm body from the sound emitting part. A board is arranged. As such an alarm, for example, a configuration as disclosed in Patent Document 1; Japanese Patent Application Laid-Open No. 2009-134158 is known.

Japanese Unexamined Patent Publication No. 2009-134158 (Fig. 2, Fig. 7, etc.)

In the alarm device disclosed in Patent Document 1, in addition to the shielding plate provided in the sound emitting portion, a component member for preventing foreign matter from entering is also provided inside the alarm device main body. By adopting a plurality of such components for preventing the intrusion of foreign matter, the manufacturing cost of the alarm device is increased, and the alarm sound generated from the diaphragm is attenuated before being emitted from the sound emitting part to the external space. , There is a problem that the sound pressure of the alarm sound emitted from the sound emitting part is lowered.

Therefore, the present invention has been made to solve the above problems, and the object thereof is as follows. That is, an object of the present invention is to provide an alarm device in which a configuration for preventing the alarm sound emitted from the sound emitting unit from being attenuated as much as possible is realized with a simple and low-cost configuration. ..

As a result of diligent research by the inventor to realize the configuration of the above alarm, the following configuration was conceived. That is, the present invention is provided on the front side of the sound source, the main body portion which is the sound path formed by the spiral path which is the propagation path of the vibration wave generated from the sound source, and the sound path, and propagates the sound path. An alarm device having a sound emitting portion that emits the generated vibration wave to an external space, and covering the opening portion of the sound emitting portion at a position at a predetermined distance from the opening portion of the sound emitting portion. It has at least one of a sound emitting portion shielding plate arranged to face the main body portion and a reflecting plate formed parallel to a plane including an opening end surface in the opening portion of the sound emitting portion. It is characterized by.

As a result, the alarm sound emitted from the sound emitting unit can be increased rather than attenuated by the low cost and simple configuration.

Further, it is preferable that the outer peripheral edge position of the reflector and the outer peripheral edge position of the sound emitting portion shielding plate coincide with the projection position on the front side of the main body portion.

As a result, the maximum outer peripheral dimension of the alarm can be aligned with the position of the reflector and the position of the sound emitting portion shielding plate, and the layout of the alarm can be easily set when the alarm is arranged in a narrow portion.

Further, it is preferable that the opening portion of the sound emitting portion is formed by an upright portion that stands up on the front side of the main body portion.

This makes it easier to concentrate the alarm sound emitted from the sound emitting unit on the front side of the main body unit.

Further, the main body portion has a first member forming the front surface side of the main body portion and a second member accommodating the sound source and forming the rear surface side of the main body portion, and the sound emitting portion. It is preferable that the shielding plate is integrally attached to the first member via a holding member, and the reflector is integrally formed with the second member.

As a result, the main body of the alarm can be easily assembled, the manufacturing cost of the alarm can be reduced, the finished dimensions of the product can be made uniform, and the sound emitting performance as designed can be exhibited.

Further, it is preferable that the sound emitting portion shielding plate and the reflecting plate are attached to a moving body to which the main body portion is mounted.

As a result, the degree of freedom in the arrangement position of the sound emitting portion shielding plate and the reflecting plate is increased, and the sound pressure of the alarm sound emitted from the sound emitting portion can be increased as much as possible.

According to the configuration of the alarm device in the present invention, a part of the sound pressure that has conventionally flowed out to the rear side of the alarm device is reflected to the front side of the alarm device by the reflecting plate, so that the sound pressure is at the front position of the sound emitting portion. It has become possible to increase the sound pressure of the alarm sound. Further, when the sound emitting part shielding plate is arranged at a position separated from the front side of the sound emitting part by a predetermined distance, foreign matter is surely prevented from entering from the sound emitting part, so that the alarm main body Some or all of the components for preventing foreign matter from entering the inside of the alarm can be omitted, the attenuation of the alarm sound can be further reduced, and the manufacturing cost of the alarm can be significantly reduced.

It is a perspective view before assembling the alarm device in 1st Embodiment. It is a perspective view of the alarm device in 1st Embodiment. It is a side view of the alarm device in 1st Embodiment. It is a graph which showed the relationship between the arrangement position of the sound emitting part shielding plate and the reflector and the measured sound pressure, and the relationship between the position where the reflectors of different sizes are arranged, and the measured sound pressure. It is a perspective view of the alarm device in 2nd Embodiment. It is a perspective view of the alarm device in 3rd Embodiment.

Hereinafter, embodiments of the alarm device in the present invention will be described with reference to the drawings.

(First Embodiment)
1 to 3 show the alarm device according to the first embodiment. The alarm 100 in the present embodiment is a so-called electric alarm 100 that is attached to a moving body represented by an automobile, a ship, or the like and is operated by electric power supplied from a battery or the like mounted on the moving body. is there. As shown in FIG. 1, the alarm device 100 in the present embodiment accommodates a vibrating unit 10 having an electromagnetic coil and a diaphragm 12 (not shown) for generating a sound source, and the vibrating unit 10 and has a spiral path. It has a main body 20 that forms an eggplant sound path. The main body 20 constitutes a first member 30 that constitutes the front side of the main body 20 that is the front side of the moving body in the traveling direction, and a rear surface side of the main body 20 that is the rear side of the moving body of the main body 20 in the traveling direction. It has a second member 40 to be used.

The vibrating unit 10 is provided with a connector 13 for supplying electric power from the battery of the moving body and a bracket 14 for attaching the alarm device 100 to the moving body on the rear surface side, and is an internal space of the main body 20 described later. Is housed in. The electric power from the battery is intermittently supplied to an electromagnetic coil (not shown) via the connector 13, vibrates the shaft 11 inserted in the electromagnetic coil, and vibrates the diaphragm 12 attached to the shaft 11, thereby causing an alarm sound. It generates a vibration wave that is the sound source of. Since the configuration of such a vibrating portion 10 is known, detailed description here will be omitted.

In the alarm device 100 of the present embodiment, the main body portion 20 that covers the side surface and the front surface of the vibrating portion 10 is formed by the first member 30 and the second member 40. The first member 30 in the present embodiment is formed with a cover 32 that covers the front surface side of the second member 40 and an upright portion 34 that is a part of the sound emitting portion 50 of the alarm device 100. Further, a sound emitting portion shielding plate 36 is attached to the cover 32 or the upright portion 34 via a holding member (not shown). The sound emitting portion shielding plate 36 is arranged to face the main body portion 20 at a position on the front side of the sound emitting portion 50 at a predetermined distance, and covers the opening portion of the sound emitting portion 50.

The sound emitting portion shielding plate 36 is provided parallel to the plane including the opening end surface 52 in the opening portion of the sound emitting portion 50, and at least the opening portion of the sound emitting portion 50 is projected onto the vertical surface on the front side of the main body. It has a size that can shield. In the prior art, the shielding member as a component for preventing foreign matter from entering, which is arranged on the front side of the sound emitting portion 50, adopts a so-called mesh structure or lattice structure, whereas the sound emitting in the present embodiment. The structure of the partial shielding plate 36 is clearly different in that it is formed in a simple flat plate shape.

As shown in FIG. 1, the second member 40 in the present embodiment has a first side wall 41, a partition wall 42, a spiral plate 44, a second side wall 45, an upright portion 46, and a reflector 47. The first side wall 41 and the partition wall 42 cover the side surface and the front surface of the vibrating portion 10. A communication hole 43 is formed in the central portion of the partition wall 42. The communication hole 43 is located at the starting point and the center point of the spiral plate 44, and communicates the vibrating portion 10 with the spiral sound path formed by the spiral plate 44. The spiral plate 44 is erected from the communication hole 43 as a starting point (center point) so as to form a spiral shape that circulates toward the outside of the partition wall 42 while gradually separating from the communication hole 43 on the front surface side of the partition wall 42. There is.

Further, a second side wall 45 that stands up on the opposite side of the first side wall 41 is provided at the outer peripheral edge position of the partition wall 42, and a part of the sound emitting portion 50 is raised on the lower portion of the partition wall 42. A portion 46 is provided. Further, in the second member 40, when the second member 40 and the first member 30 are integrated, the upright portion 46 is formed at the base of the upright portion 46 so as to form the same plane as the cover 32 of the first member 30. A reflector 47 is formed so as to extend in a brim shape in a direction orthogonal to the protruding direction of the above. That is, the reflector 47 is formed so as to cover a wider range than the opening portion of the sound emitting portion 50.

The alarm 100 is formed by integrally assembling the vibrating portion 10, the first member 30, and the second member 40 described above, and the alarm device 100 is formed in the internal space of the main body portion 20 composed of the first member 30 and the second member 40. A sound path composed of a spiral path (propagation path) for propagating a vibration wave is formed by a swirl plate 44 or the like located, and a sound emitting portion 50 is formed by an upright portion 34 of the first member 30 and an upright portion 46 of the second member 40. It will be formed. Further, as shown in FIGS. 1 to 3, the outer peripheral edge position of the reflector 47 and the outer peripheral edge position of the sound emitting portion shielding plate 36 are set so that the projected positions on the vertical surface on the front side of the main body portion coincide with each other. Is preferable. As a result, the maximum outer peripheral dimension of the alarm 100 can be aligned at the positions of the sound emitting portion shielding plate 36 and the reflector plate 47, and it is easy to set the layout when the alarm 100 is arranged in a narrow portion such as in the hood of an automobile. It is convenient in that it becomes.

As described above, in the alarm device 100 of the present embodiment, a sound emitting portion shielding plate 36 that covers the entire surface of the opening portion of the sound emitting portion 50 is simply arranged at a position in front of the opening portion of the sound emitting portion 50. In the above case, the alarm sound emitted from the sound emitting unit 50 to the external space is blocked by the front side of the alarm device 100 (the front side in the traveling direction of the moving body). However, when the inventor of the present application conducted an experiment, even if it was on the front side of the opening surface of the sound emitting part 50, if the position was separated by a predetermined distance, the alarm sound when the sound emitting part shielding plate 36 was arranged could be heard. It was found that there is a position where the measured sound pressure exceeds the measured sound pressure of the alarm sound when the sound emitting portion shielding plate 36 is not arranged.

In FIG. 4, the upper graph shows the relationship between the distance from the opening surface of the sound emitting portion of the sound emitting portion shielding plate to the front side and the measured sound pressure, and the graph rearward from the opening surface of the sound emitting portion of the reflector. It is a graph which showed the relationship between the separation distance to a side and the measured sound pressure. The lower graph is a graph showing the relationship between the distance from the opening surface of the sound emitting portion of the reflector to the rear side and the measured sound pressure, which can be transferred when different size reflectors are used. In this experiment, an alarm with a swirling sound path that is not provided with a sound emitting part shielding plate or a component for preventing foreign matter from entering is used, and the sound emitting part is placed in front of the moving body equipped with the alarm in the traveling direction. I went with it facing. The frequency of the alarm sound generated by the diaphragm was 500 Hz, and the size of the opening portion of the sound emitting portion was 50 mm × 63 mm. In this experiment, a flat plate separate from the main body of the alarm was used as the reflector, and the dimensions of the sound emitting part shielding plate and the reflector were 100 mm × 100 mm. The measurement position of the alarm sound follows the conditions for measuring the alarm sound of the alarm device.

The experimental results of the sound emitting portion shielding plate 36 will be described. The sound emitting portion shielding plate 36 is arranged at a position where the separation distance (required distance) from the end surface of the opening portion of the sound emitting portion 50 to the surface of the sound emitting portion shielding plate 36 on the side of the sound emitting portion 50 is up to 45 mm. It can be seen that the measured sound pressure of the alarm sound at that time is lower than the measured sound pressure of the alarm sound when the sound emitting portion shielding plate 36 is not arranged. On the other hand, at a position where the separation distance from the end surface of the opening portion of the sound emitting portion 50 to the surface of the sound emitting portion shielding plate 36 on the side of the sound emitting portion 50 exceeds 45 mm, the sound emitting portion shielding plate 36 is arranged. It can be seen that the measured sound pressure of the alarm sound at that time exceeds the measured sound pressure of the alarm sound when the sound emitting portion shielding plate 36 is not arranged by about 2 dBA at the maximum.

Further, by making the front side of the opening portion of the sound emitting portion 50 completely shielded by the sound emitting portion shielding plate 36, foreign matter typified by water and dust can surely enter the internal space of the main body portion 20. Can be prevented. As a result, it is possible to omit the arrangement of members for preventing foreign matter from entering the internal space of the main body 20, simplify the structure of the alarm 100, reduce the weight of the alarm 100, and reduce the manufacturing cost. In addition, it is advantageous in that the attenuation of the alarm sound can be avoided.

Next, the experimental results of the reflector will be described. In the upper graph of FIG. 4, when the reflector is arranged at the position where the distance x from the end face to the rear side in the opening portion of the sound emitting portion is 0 mm ≦ x <40 mm, when the reflector is not arranged. Sound pressure equal to or higher than that was measured. In this range, the measured sound pressure at x = 5 mm is the highest value. It can be seen that the maximum value at this time exceeds the measured sound pressure of the alarm sound when the reflector is not arranged by about 2 dBA at the maximum. When the reflector was placed at a position where the distance x from the end face to the rear side at the opening of the sound emitting portion was 40 mm ≦ x <70 mm, a lower sound pressure was measured than when the reflector was not provided. .. In this range, the measured sound pressure when x = 50 mm is the lowest value. When the reflector is arranged at a position where the distance x from the end face to the rear side in the opening portion of the sound emitting portion is 70 mm ≦ x <115 mm, the sound pressure equal to or higher than that when the reflector is not arranged is measured. It was. In this range, the measured sound pressure at x = 90 mm is the highest value. It can be seen that the maximum value at this time exceeds the measured sound pressure of the alarm sound when the reflector is not arranged by about 2 dBA at the maximum. The measured sound pressure values after x ≦ 115 also show the same behavior as in the range of 0 ≦ X <115, and the peak of the measured sound pressure is the second peak and thereafter at 85 mm intervals with the position of X = 5 mm as the first peak. Is clearly appearing.

Further, in the lower graph of FIG. 4, the upper peak at which the measured sound pressure is maximized at a predetermined distance from the end face at the opening portion between the reflector and the sound emitting portion regardless of the size of the reflector. Is appearing. It is characteristic that the value of the lower peak at which the measured sound pressure becomes the minimum is extremely low when the separation distance is around 290 mm. It was also clarified that the larger the size of the reflector, the larger the absolute value of the maximum and minimum values of the measured sound pressure.

In this experiment, a flat plate separate from the main body 20 of the alarm device 100 is used as the reflector 47, but the opening of the sound emitting part 50 of the main body 20 extends to the outside of the opening. It is expected that the same tendency will be observed in the present embodiment to which the flange-shaped reflector 47 is attached. From the above experimental results, in the alarm device 100 according to the first embodiment, when the cover 32 of the first member 30 and the reflector 47 of the second member 40 are formed to be flush with each other, the sound emitting unit If the height of the upright portion 46 forming the opening portion of the 50 from the surface of the reflector 47 is 5 mm, the sound pressure of the alarm sound on the front side of the alarm 100 can be maximized, which is convenient. ..

(Second Embodiment)
FIG. 5 is a perspective view of the alarm device according to the second embodiment. The alarm device 100 in the present embodiment is different from the configuration of the alarm device 100 in the first embodiment in that the flange-shaped reflector 47 of the second member 40 is not provided. Since the other configurations are the same as the configurations of the alarm device 100 in the first embodiment, the description of the individual configurations here will be omitted by adding the reference numerals used in the first embodiment. Even with the configuration of the alarm device 100 in the present embodiment, according to the experimental results of the inventor, the measured sound pressure value of the alarm sound in the conventional alarm device 100 which does not have the sound emitting part shielding plate 36 and the reflecting plate 47 Was able to obtain a high sound pressure value.

(Third Embodiment)
FIG. 6 is a perspective view of the alarm device according to the third embodiment. The alarm device 100 in the present embodiment is different from the configuration of the alarm device 100 in the first embodiment in that the configuration of the sound emitting portion shielding plate 36 is omitted. Since the other configurations are the same as the configurations of the alarm device 100 in the first embodiment, the description of the individual configurations here will be omitted by adding the reference numerals used in the first embodiment. Even with the configuration of the alarm device 100 in the present embodiment, according to the experimental results of the inventor, the measured sound pressure value of the alarm sound in the conventional alarm device 100 which does not have the sound emitting part shielding plate 36 and the reflecting plate 47 Was able to obtain a high sound pressure value.

Although the alarm device 100 according to the present invention has been described in detail based on the present embodiment, the present invention is not limited to the above-described embodiment. For example, the sound emitting portion shielding plate 36 in the present embodiment describes a mode in which the sound emitting portion shielding plate 36 is held by the cover 32 or the standing portion 34 of the first member 30 via the holding member, but the sound emitting portion shielding plate 36 moves. It is also possible to adopt a form attached to the body. As a result, the degree of freedom in the arrangement position of the sound emitting portion shielding plate 36 is improved, and the sound emitting portion shielding plate 36 is arranged at the position where the sound pressure of the alarm sound emitted from the sound emitting portion 50 is the highest. You will be able to do it.

Although the reflector 47 in the present embodiment has been described as being integrally formed with the second member 40, it is also possible to adopt a form in which the reflector 47 is attached to a moving body, similarly to the sound emitting portion shielding plate 36. This makes it possible to adopt a reflector 47 that is larger than the alarm 100, and increases the amount of alarm sound reflected by the reflector 47 to increase the measured sound pressure at the position on the front side of the alarm 100. It can be made larger. Further, the degree of freedom in the arrangement position of the reflector 47 is improved, and the reflector 47 can be arranged at the position where the sound pressure of the alarm sound emitted from the sound emitting portion is the highest. Further, the reflector 47 can be formed on the same surface as the opening portion of the sound emitting portion 50.

Further, as is clear from the above embodiments, by applying at least one of the sound emitting unit shielding plate 36 and the reflecting plate 47 to the alarm device 100, an alarm sound emitted from the sound emitting unit 50 is emitted. Sound pressure can be increased. Then, it is also possible to adopt a form in which the modifications and the like described in the above embodiments are appropriately combined.

10 Vibrating part,
11 shaft, 12 diaphragm, 13 connector, 14 bracket,
20 Main body,
30 First member,
32 cover, 34 standing part, 36 sound emitting part shielding plate,
40 Second member,
41 1st side wall, 42 partition wall, 43 communication hole, 44 spiral plate, 45 2nd side wall,
46 Standing part, 47 Reflector,
50 sound emitting part,
52 Open end face,
100 alarm

Claims (6)

Sound source and
The main body, which is the sound path in which the spiral path, which is the propagation path of the vibration wave generated from the sound source, is formed.
An alarm device provided on the front surface side of the main body portion and having a sound emitting portion that emits the vibration wave propagating the sound path to an external space.
In a sound emitting portion shielding plate which covers the opening portion of the sound emitting portion and is arranged to face the main body portion at a position at a predetermined distance from the opening portion of the sound emitting portion, and in the opening portion of the sound emitting portion. An alarm device having at least one of a reflector formed parallel to a plane including an open end face. The alarm device according to claim 1, wherein the position of the outer peripheral edge of the reflector and the position of the outer peripheral edge of the sound emitting portion shielding plate coincide with each other in the projected position toward the front side of the main body. The alarm device according to claim 1 or 2, wherein the opening portion of the sound emitting portion is formed by an upright portion that stands on the front side of the main body portion. The main body portion has a first member that forms the front surface side of the main body portion, and a second member that accommodates the sound source and forms the rear surface side of the main body portion.
The sound emitting portion shielding plate is integrally attached to the first member via a holding member.
The alarm device according to any one of claims 1 to 3, wherein the reflector is integrally formed with the second member. The alarm device according to any one of claims 1 to 3, wherein the sound emitting portion shielding plate is attached to a moving body to which the main body portion is mounted. The alarm device according to any one of claims 1 to 3, wherein the reflector is attached to a moving body to which the main body is mounted.

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