# Patent

## Title
Electrical horn

## Abstract

An electrical horn includes a horn housing, an oscillation member located at the horn housing to generate a sonic wave, and a resonance tube in which the sonic wave generated by the oscillation member flows. In the electrical horn, the resonance tube has a plurality of sonic outlet portions that are open in different directions. Accordingly, when the electrical horn is mounted to a vehicle, it is possible to reduce an amount of foreign material entering into the resonance tube while increasing a sonic pressure toward a vehicle front side.

## Background
CROSS REFERENCE TO RELATED APPLICATION
This application is based on Japanese Patent Application No. 2008-291202 filed on Nov. 13, 2008; the contents of which are incorporated herein by reference in its entirety.
FIELD OF THE INVENTION
The present invention relates to an electrical horn (e.g., a warning horn) used for a vehicle such as an automobile, a bus, a truck or the like.
BACKGROUND OF THE INVENTION
Generally, a horn for a vehicle is provided with a scroll-type or a trumpet-type resonance tube.
For example, in an electrical horn, an oscillation plate oscillates by a solenoid force to generate a sonic wave for oscillating air, and the sonic wave is amplified in a resonance tube. That is, the air oscillation generated by the oscillation plate is transmitted to an exterior of the electrical horn through a sonic passage inside the resonance tube. The resonance tube is a scroll-type resonance tube or a trumpet-type resonance tube, which has an open end portion used as a sonic outlet portion.
The electrical horn is generally attached to a vehicle such that the sonic outlet portion is open toward downwardly, so as to restrict foreign material such as water from entering into the resonance tube from the sonic outlet portion. When the sonic outlet portion is open toward downwardly, a sonic pressure toward a vehicle front side is reduced. Furthermore, even if the sonic outlet portion is open toward downwardly, droplet in vehicle running or water in vehicle washing may be entered into the resonance tube from the sonic outlet portion and may stay in the resonance tube.
JP 2008-89627A proposes an electrical horn configured to reduce the foreign material flowing therein. The electrical horn includes a reflection member configured by a back plate and a bottom plate. The back plate has a through hole and extends to a bottom side of the sonic outlet portion, and the bottom plate extends from the back plate to the vehicle front side, in the reflection member.
In the electrical horn described in JP 2008-89627A, foreign materials flying from the front side moves to the rear side after passing through the through hole of the back plate, and thereby it is necessary to make the through hole to be larger in order to reduce the foreign material staying in the electrical horn. In contrast, the through hole of the back plate needs to be smaller in order to increase the sonic pressure, toward the vehicle front side. That is, the dimension of the through hole has a trade-off relation between an increase of the sonic pressure and a reduction of the foreign material. Therefore, it is difficult to increase the sonic pressure while effectively reducing the foreign material entering into a resonance tube of the electrical horn. Furthermore, the foreign material entering the resonance tube from the sonic outlet portion may flow deeply into the resonance tube. In addition, because the reflection member protrudes downwardly from the sonic outlet portion, the outer dimension of the electrical horn may become larger, and the electrical horn may be difficult to be mounted to a vehicle having a small mounting dimension.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is an object of the present invention to provide an electrical horn having at least two sonic outlet portions.
It is another object of the present invention to provide an electrical horn for a vehicle, which can reduce an amount of foreign material entering into a resonance tube while increasing a sonic pressure toward a vehicle front side, when the electrical horn is mounted to the vehicle.
According to an aspect of the present invention, an electrical horn includes a horn housing, an oscillation member located at the horn housing to generate a sonic wave, and a resonance tube in which the sonic wave generated by the oscillation member flows. In the electrical horn, the resonance tube has a plurality of sonic outlet portions that are open in different directions. Accordingly, when the electrical horn is mounted to a vehicle, it is possible to reduce an amount of foreign material entering into the resonance tube while increasing a sonic pressure toward a vehicle front side.
For example, the plurality of sonic outlet portions may be two sonic outlet portions that are open respectively in two wall surfaces of the resonance tube, facing in different directions. Furthermore, at least one of the sonic outlet portions may be provided with plural openings.
The oscillation member may be an oscillation plate member located between the horn housing and a cover member that is spaced from the oscillation plate member to be approximately parallel with the oscillation plate member. Furthermore, the resonance tube may include a scroll portion defining a sonic passage between the cover member and a parallel wall portion extending approximately in parallel with the cover member, and a trumpet portion continuously extending from the scroll portion to define the sonic passage. In this case, a passage sectional area of the sonic passage of the scroll portion is gradually increased toward downstream, and a passage sectional area of the sonic passage of the trumpet portion is rapidly increased. Furthermore, the trumpet portion has an orthogonal wall surface that extends from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to define the sonic passage, and at least two of the sonic outlet portions are open in the trumpet portion to face in different directions.
For example, one of the sonic outlet portions may be open at a tip end of the trumpet portion, and the other one of the sonic outlet portions may be open in the orthogonal wall surface. In this case, the electrical horn may include a shielding plate located to cover a part of the one sonic outlet portion provided at the tip end of the trumpet portion. Furthermore, the shielding plate may cover a part of the one sonic outlet portion at the tip end of the trumpet portion, on a side near the sonic outlet portion provided in the orthogonal wall surface.
Alternatively, a tip end of the trumpet portion may be fully closed. In this case, one of the sonic outlet portions may be open in the orthogonal wall surface of the trumpet portion, and the other one of the sonic outlet portions may be open in a wall surface of the trumpet portion, other than the orthogonal wall surface.
The resonance tube may further include a protruding wall part protruding from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to be opposite to the orthogonal wall surface.
The orthogonal wall surface may be provided in a part of the parallel wall portion such that a protruding dimension protruding from the parallel wall portion is gradually increased as toward a tip end of the trumpet portion in a first circumferential direction. Furthermore, the protruding wall part may be provided in a part of the parallel wall portion such that a protruding dimension protruding from the parallel wall portion is gradually increased as toward the tip end of the trumpet portion in a second circumferential direction opposite to the first circumferential direction.
Furthermore, the trumpet portion may include a cover part that protrudes from a wall surface approximately perpendicular to the orthogonal wall surface and covers a part of the parallel wall portion. In addition, the orthogonal wall surface and the cover part may be configured together with the parallel wall portion to define an opening.
Alternatively, the resonance tube may include a protruding wall part protruding from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to be opposite to the orthogonal wall surface, and the cover part and protruding wall part may define an opening that is larger than an open area of the sonic outlet portion provided in the orthogonal wall surface.



BRIEF DESCRIPTION OF THE DRAWINGS
Additional objects and advantages of the present invention will be more readily apparent from the following detailed description of preferred embodiments when taken together with the accompanying drawings. In which:
FIG. 1 is a perspective view showing an example of an electrical horn according to a first embodiment of the present invention;
FIGS. 2A and 2B are a front view and a side view, showing the electrical horn shown in FIG. 1, in a state mounted to a front grill of a vehicle;
FIG. 3 is a cross-sectional view taken along the line of FIG. 2;
FIG. 4 is a perspective view showing another example of an electrical horn according to the first embodiment;
FIGS. 5A and 5B are a front view and a side view showing the electrical horn shown in FIG. 4, in a state mounted to a front grill of a vehicle;
FIGS. 6A and 6B are a perspective view and a side view showing another example of an electrical horn according to the first embodiment;
FIG. 7 is a perspective view showing another example of an electrical horn according to the first embodiment;
FIG. 8 is a perspective view showing another example of an electrical horn according to the first embodiment;
FIGS. 9A and 9B are a perspective view and a front view showing an electrical horn according to a second embodiment of the present invention;
FIGS. 10A and 10B are a perspective view and a front view showing another example of an electrical horn according to the second embodiment of the present invention;
FIGS. 11A and 11B are a perspective view and a front view showing an electrical horn according to a third embodiment of the present invention; and
FIGS. 12A and 12B are a perspective view and a front view showing an electrical horn according to a fourth embodiment of the present invention.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiments and modifications of the present invention will be described with reference to the accompanying drawings.
First Embodiment
A first embodiment and modifications thereof according to the present invention will be described with reference to FIGS. 1 to 8.
FIG. 1 is a perspective view showing an example of an electrical horn 1 according to the first embodiment of the present invention, FIGS. 2A and 2B are a front view and a side view showing the electrical horn 1 shown in FIG. 1 in a state mounted to a front grill of a vehicle, and FIG. 3 is a cross-sectional view taken along the line of FIG. 2A.
The electrical horn 1 shown in FIGS. 1 to 3 includes a horn housing 10, an oscillation member 11 fixed to the horn housing 10 to generate a sonic wave, and a resonance tube 25 connected to the horn housing 10 to enclose the oscillation member 11. The resonance tube 25 is provided with a sonic inlet portion 25a, and two sonic outlet portions 25b, 25c. As shown in FIGS. 2A and 2B, the two sonic outlet portions 25b, 25c have open surfaces facing toward two different directions. That is, the sonic outlet portions 25b, 25c are open toward in two different directions. In FIGS. 2A and 2B, GL indicates a ground line (ground surface) when the electrical horn 1 is mounted to a vehicle. In the example of FIGS. 2A and 2B, the sonic outlet portion 25b is open toward downwardly, and the sonic outlet portion 25c is open toward a vehicle side substantially perpendicular to the open direction of the sonic outlet portion 25b. 
An electromagnet 12 configured to generate an electromagnetic force and to oscillate the oscillation member 11, a fixed core 21 and the like are accommodated in the horn housing 10. A stay 22 is fixed to the horn housing 10, and the horn housing 10 is fixed to a vehicle (not shown) by using the stay 22.
The electromagnet 12 is provided with a coil 14 wound a bobbin 13, and a lower portion of a movable core 15 is located in a center hole portion of the bobbin 13. A center portion of the oscillation member 11 is fastened to an upper portion of the movable core 15, and an outer peripheral portion of the oscillation member 11 is wound to and fastened to an outer peripheral end portion of the horn housing 10.
The cover member 25d is spaced from the oscillation member 11 and is arranged approximately in parallel with the oscillation member 11 at a side opposite to the horn housing 10 with respect to the oscillation member 11. The outer peripheral end portion of the cover member 25d is wound and fastened to the outer peripheral end portion of the horn housing 10 to be overlapped with the outer peripheral end portion of the oscillation member 11 and the outer peripheral end portion of the horn housing 10. That is, the outer peripheral end portion of the cover member 25d is bent to have a recess portion, and the outer peripheral end portions of the oscillation member 11 and the horn housing 10 are inserted into the recess portion to be fastened and fixed to the outer peripheral end portion of the cover member 25d. The sonic inlet portion 25a is provided at a center area of the cover member 25d. 
The resonance tube 25 includes a scroll portion 25h defining therein a scroll sonic passage 25g. The scroll sonic passage 25g is formed between the cover member 25d and a parallel wall portion 25e extending approximately in parallel with the cover member 25d, such that a passage sectional area 25f (e.g., rectangular sectional area) is gradually increased in the scroll sonic passage 25g. A trumpet portion 25j is provided integrally with the scroll portion 25h such that the passage sectional area 25f is rapidly increased in the trumpet portion 25j as toward the sonic outlet portion 25b. The trumpet portion 25j includes an orthogonal wall surface 25i for defining the sonic passage 25g, and the orthogonal wall surface 25i is provided to protrude approximately perpendicularly from a surface of the parallel wall portion 25e. That is, the trumpet portion 25j is integrally provided with the scroll portion 25h to continuously define the sonic passage 25g in the resonance tube 25.
The sonic outlet portion 25b is fully opened at a tip end portion of the trumpet portion. In contrast, the sonic outlet portion 25c is provided in the orthogonal wall surface 25i that protrudes approximately perpendicularly from the parallel wall portion 25e, at a position close to the tip end portion of the trumpet portion 25j. 
In the example of the electrical horn 1 having the above-described structure shown in FIGS. 1 to 3, a sonic wave (i.e., air oscillation) transmitted from the sonic inlet portion 25a is amplified while passing through the sonic passage 25g, and is exited from the sonic outlet portions 25b, 25c. Generally, the electrical horn 1 is mounted to a vehicle in a state shown in FIGS. 2A and 2B. The sonic outlet portion 25b opened at the tip end portion of the trumpet portion 25j faces toward downwardly (i.e., the ground surface GL), and the parallel wall portion 25e faces toward the vehicle front side. Therefore, the sonic outlet portion 25c is open toward a vehicle side, as shown in FIG. 2B. Thus, both the sonic outlet portion 25b and the sonic outlet portion 25c are not open toward the vehicle front side, thereby preventing foreign materials from directly flying into the sonic outlet portions 25b and 25c from the vehicle front side.
Because the parallel wall portion 25e is provided to face toward the vehicle front side, a part of the sonic wave flowing out of the sonic outlet portion 25c is reflected by the parallel wall portion 25e toward the vehicle front side, thereby increasing the sonic pressure toward the vehicle front side. In the example of FIGS. 2A and 2B, the sonic outlet portion 25b is open toward downwardly, and the sonic outlet portion 25c is open toward a vehicle side in a vehicle right-left direction.
Foreign material entering from the sonic outlet portion 25b can be discharged from the sonic outlet portion 25c to an exterior of the resonance tube 25, thereby effectively reducing the foreign material staying in the resonance tube 25. Similarly, foreign material entering from the sonic outlet portion 25c can be discharged from the sonic outlet portion 25b to the exterior of the resonance tube 25, thereby effectively reducing the foreign material staying in the resonance tube 25.
The electrical horn 1 according to the first embodiment is not limited to the example shown in FIGS. 1 to 3, and can be suitably modified. For example, in the example of FIG. 1, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle side in the vehicle left-right direction. Alternatively, in the example of FIG. 1, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle rear side. Alternatively, in the example of FIG. 1, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle front side.
FIGS. 4, 5A and 5B show another example of an electrical horn 1 of the first embodiment, in which a part of the sonic outlet portion 25b provided at the tip end portion of the trumpet portion 25j is closed by a shielding plate 25k. In the example of FIGS. 4, 5A and 5B, a right half area of the sonic outlet portion 26b at the tip end portion of the trumpet portion 25j, at a side near the sonic outlet portion 25c, is closed by the shielding plate 25k. Therefore, the sonic wave reflected by the shielding plate 25k can effectively flow out of the sonic outlet portion 25c. Thus, a part of the sonic wave flowing out of the sonic outlet portion 25c is reflected by the parallel wall portion 25e toward the vehicle front side, thereby further improving the sonic pressure toward the vehicle front direction.
FIGS. 6A and 6B show another example of an electrical horn 1A of the first embodiment, in which a plurality of sonic outlet portions 25b and a plurality of sonic outlet portions 25c are respectively opened. In this case, the amount of foreign material flowing into the resonance tube 25 from the sonic outlet portions 25b and 25c can be further reduced. Furthermore, as shown in FIG. 6A, the shielding plate 25k can be provided to close a part of the sonic outlet portions 25b at the tip end portion of the trumpet portion 25j. Therefore, the amount of foreign material flowing into the resonance tube 25 from the sonic outlet portions 25b can be more effectively reduced.
FIG. 7 shows another example of an electrical horn 1B of the first embodiment, in which the tip end portion of the trumpet portion 25j, generally used as a sonic outlet portion, is completely closed by a shielding plate 25k. In the example of the electrical horn 1B shown in FIG. 7, the sonic outlet portion 25b is provided in a wall surface that defines the sonic passage 25g of the trumpet 25j and faces toward a vehicle rear side, and the sonic outlet portion 25c is provided in the wall surface that defines the sonic passage 25g of the trumpet 25j and faces toward a vehicle side in the vehicle left-right direction. In this case, because the sonic outlet portions 25b and 25c are open in the vehicle rear direction and the vehicle side direction which are different from each other, thereby improving the sonic pressure in the vehicle front direction and reducing the amount of the foreign material entering the resonance tube 25.
FIG. 8 shows another example of an electrical horn 1B of the first embodiment, in which the tip end portion of the trumpet portion 25j, generally used as a sonic outlet portion, is completely closed by a shielding plate 25k. In the example of the electrical horn 1B of FIG. 8, a sonic outlet portion 25b is provided in a wall surface that defines the sonic passage 25g of the trumpet 25j and faces toward a vehicle side in the vehicle left-right direction, and the sonic outlet portion 25c is provided in the wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle side opposite to the sonic outlet portion 25b in the vehicle left-right direction. That is, the sonic outlet portions 25b and 25c are provided in the wall surfaces of the trumpet portion 25j to be opposite to each other. In this case, the sonic outlet portions 25b and 25c are open in the vehicle left and right directions which are different from each other, thereby improving the sonic pressure in the vehicle front side and reducing the amount of the foreign material entering the resonance tube 25.
In the example of FIG. 7, the sonic outlet portion 25b may be provided in a wall surface facing toward a vehicle front side, in the wall surface defining the sonic passage 25g of the trumpet portion 25j. 
Furthermore, in the example of FIG. 7, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle side in the vehicle left-right direction. Alternatively, in the example of FIG. 7, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle rear side. Alternatively, in the example of FIG. 7, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle front side.
In the example of FIG. 8, the sonic outlet portion 25c may be provided in a wall surface that defines the sonic passage 25g of the trumpet portion 25j and faces toward a vehicle front side.
Second Embodiment
A second embodiment of the present invention will be described with reference to FIGS. 9A to 10B. In the second embodiment and modifications thereof, the parts having functions similar to or corresponding to those of the electrical horn in the above-described first embodiment are indicated by the same reference numbers, and the detail explanation thereof is omitted.
FIGS. 9A and 9B show an example of an electrical horn 1C of the second embodiment, in which a wall part 25m protruding from the parallel wall portion 25e is provided. The wall part 25m is arranged, such that a lower portion of the wall part 25m is wound on an outer peripheral surface of a part of the parallel wall portion 25e and an upper portion of the wall part 25m protrudes from the parallel wall portion 25e to the vehicle front side. The protruding dimension of the wall part 25m is gradually increased toward the tip end portion of the trumpet portion 25j in a circumferential direction, opposite to the orthogonal wall surface 25i. One side end portion of the wall part 25m having the largest protruding dimension is fixed to an end portion of the trumpet portion 25j with the largest protruding dimension of the orthogonal wall surface 25i, and the other side end portion of the trumpet portion 25j is fixed to an outside of a wall surface of the trumpet portion 25j at a position opposite to the orthogonal wall surface 25i, near a protruding start of the orthogonal wall surface 25i. That is, the protruding dimension of the wall portion 25m is gradually increased toward the tip end portion of the trumpet portion 25j in a first circumferential direction on a part of the parallel wall portion 25e, and the protruding dimension of the orthogonal wall surface 25i is gradually increased toward the tip end portion of the trumpet portion 25j in a second circumferential direction opposite to the first circumferential direction on another part of the parallel wall portion 25e. 
In the electrical horn 1C of the second embodiment, because the wall part 25m protruding from the parallel wall portion 25e toward the vehicle front side is provided, the foreign material entering from the sonic outlet portion 25c can be reduced by the wall part 25m. Furthermore, because the wall part 25m protrudes from the parallel wall portion 25e, the sonic wave flowing out of the sonic outlet portion 25c can be reflected by the wall part 25m, thereby further increasing the sonic pressure in the vehicle front direction.
In the example of the electrical horn 1C shown in FIGS. 9A and 9B, the shielding plate 25k is provided to close a part of the sonic outlet portion 25b at the tip end portion of the trumpet portion 25j. However, in the example of the electrical horn 1C, the shielding plate 25k may be not provided.
FIGS. 10A and 10B show another example of an electrical horn 1D according to the second embodiment. In the electrical horn 1D shown in FIGS. 10A and 10B, a wall part 25n protrudes approximately from an outer surface of the parallel wall portion 25e toward a vehicle front side approximately at a center portion. The wall part 25n has the same protruding dimension in the entire length of the wall part 25n, and the protruding dimension of the wall part 25n is approximately equal to the largest protruding dimension of the orthogonal wall surface 25i. One side end portion of the wall part 25n is fixed to the end portion of the orthogonal wall surface 25i having the largest protruding dimension, and the other side end portion of the wall part 25n is fixed to the parallel wall portion 25e. The protruding dimension of the wall part 25n may be set different from the largest protruding dimension of the orthogonal wall surface 25i, and the extending direction of the wall part 25n may be different from the example of the FIGS. 10A and 10B.
Because the wall part 25n is provided to face the sonic outlet portion 25c and extends to pass the center position of the parallel wall portion 25e, a distance between the wall part 25n and the sonic outlet portion 25c can be made shorter. Accordingly, the sonic wave discharged from the sonic outlet portion 25c can be reflected by the wall part 25n, thereby increasing the sonic pressure toward the vehicle front side. Furthermore, foreign material introduced from the sonic outlet portion 25c can be reduced by the wall part 25n. 
Third Embodiment
A third embodiment of the present invention will be described with reference to FIGS. 11A and 11B. In the third embodiment and modifications thereof, the parts having functions similar to or corresponding to those of the electrical horn in the above-described embodiments are indicated by the same reference numbers, and the detail explanation thereof is omitted.
FIGS. 11A and 11B show an example of an electrical horn 1E of the third embodiment, in which a cover part 25p is provided to cover a part of a front side of the parallel wall portion 25e. As shown in FIGS. 11A and 11B, the cover part 25p protrudes from a wall surface 25q of the trumpet portion 25j approximately in parallel with the wall surface 25q. The wall surface 25q protrudes in the trumpet portion 25j to face the vehicle front side, and is approximately perpendicular to the orthogonal wall surface 25i. 
In the electrical horn 1E of the example of FIGS. 11A and 11B, the cover part 25p protrudes from the wall surface 25q of the trumpet portion 25j and covers a part of the front surface of the trumpet portion 25j. Therefore, the foreign material entering from the sonic outlet portion 25c that is open toward the vehicle side can be reduced. Furthermore, the cover part 25p, the parallel wall portion 25e and the orthogonal wall surface 25i are configured to form approximately a triangular opening EFG open toward a vehicle side in the vehicle right-left direction. Therefore, the sonic wave flowing out of the sonic outlet portion 25c is amplified and then flows out of the triangular opening EFG toward the vehicle front side.
In the example of the electrical horn 1E shown in FIGS. 11A and 11B, the shielding plate 25k is provided to close a part of the sonic outlet portion 25b at the tip end portion of the trumpet portion 25j. However, in the example of the electrical horn 1E, the shielding plate 25k may be not provided.
Fourth Embodiment
A fourth embodiment of the present invention will be described with reference to FIGS. 12A and 12B. In the fourth embodiment and modifications thereof, the parts having functions similar to or corresponding to those of the electrical horn in the above-described embodiments are indicated by the same reference numbers, and the detail explanation thereof is omitted.
FIGS. 12A and 12B show an example of an electrical horn 1F of the fourth embodiment, in which the cover part 25p is provided to cover a part of the front side of the parallel wall portion 25e so as to form a triangular opening by the cover part 25p, the parallel wall portion 25e and the orthogonal wall surface 25i, similarly to the above-described third embodiment. Furthermore, the electrical horn 1F is provided with the wall part 25m, similarly to the example of FIGS. 9A and 9B.
In the example of the electrical horn 1F, because the wall part 25m and the cover part 25p are provided, foreign material entering into the resonance tube 25 from the sonic outlet portion 25c can be reduced. Furthermore, because a semicircular opening is formed by a straight end portion EF of the cover part 25p and a semicircular end portion EF of the wall part 25m, and is larger than the opening of the sonic outlet portion 25c. Thus, the sonic wave flowing out of the sonic outlet portion 25c is amplified and then flows out of the semicircular opening toward the vehicle front side. Accordingly, the sonic pressure toward the vehicle front side can be further increased.
In the example of the electrical horn 1F shown in FIGS. 12A and 12B, the shielding plate 25k is provided to close a part of the sonic outlet portion 25b at the tip end portion of the trumpet portion 25j. However, in the example of the electrical horn 1E, the shielding plate 25k may be not provided.
Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art.
For example, in the above-described embodiments and modification thereof, at least two examples may be suitably combined when there are no a contradiction.
In the above-described embodiments and modifications thereof, the two sonic outlet portions 25b and 25c are provided in the resonance tube 25 to be open in different directions. However, a plurality of the sonic outlet portions more than two may be provided in the resonance tube 25 such that at least two of the sonic outlet portions are open in different directions. For example, the sonic outlet portion 25b is provided at the tip end portion of the resonance tube 25 (trumpet portion 25j), and the sonic outlet portions 25c can be provided at wall surfaces of the resonance tube 25, facing in different directions.
In an electrical horn that includes a horn housing (10), an oscillation member (11) fixed to the horn housing (10, 25) to generate a sonic wave and a resonance tube (25) for resonance of the generated sonic wave, when the resonance tube (25) has plural sonic outlets (25b, 25c) opened in different directions, the other structures and shapes of the electrical horn can be suitably changed.
Such changes and modifications are to be understood as being within the scope of the present invention as defined by the appended claims.

## Claims

1. An electrical horn comprising:
a horn housing;
an oscillation member fixed to the horn housing to generate a sonic wave; and
a resonance tube in which the sonic wave generated by the oscillation member flows,
wherein the resonance tube has a plurality of sonic outlet portions that are open in different directions,
the oscillation member is an oscillation plate member located between the horn housing and a cover member that is spaced from the oscillation plate member to be approximately parallel with the oscillation plate member,
the resonance tube includes a scroll portion defining a sonic passage between the cover member and a parallel wall portion extending approximately in parallel with the cover member, and a trumpet portion continuously extending from the scroll portion to define the sonic passage,
a passage sectional area of the sonic passage of the scroll portion is gradually increased toward downstream, and a passage sectional area of the sonic passage of the trumpet portion is rapidly increased,
the trumpet portion has an orthogonal wall surface that extends from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to define the sonic passage, and
at least two of the sonic outlet portions are open in the trumpet portion to face in different directions.

2. The electrical horn according to claim 1, wherein the plurality of sonic outlet portions are two sonic outlet portions that are open respectively in two wall surfaces of the resonance tube, facing in different directions.

3. The electrical horn according to claim 1, wherein at least one of the sonic outlet portions is provided with plural openings.

4. The electrical horn according to claim 1, wherein one of the sonic outlet portions is open at a tip end of the trumpet portion, and the other one of the sonic outlet portions is open in the orthogonal wall surface, the electrical horn further comprising
a shielding plate located to cover a part of the one sonic outlet portion provided at the tip end of the trumpet portion.

5. The electronic horn according to claim 4, wherein the shielding plate covers a part of the one sonic outlet portion at the tip end of the trumpet portion, on a side near the sonic outlet portion provided in the orthogonal wall surface.

6. The electrical horn according to claim 1, wherein
a tip end of the trumpet portion is fully closed, and
one of the sonic outlet portions is open in the orthogonal wall surface of the trumpet portion, and the other one of the sonic outlet portions is open in a wall surface of the trumpet portion, other than the orthogonal wall surface.

7. The electrical horn according to claim 1, wherein the resonance tube includes a protruding wall part protruding from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to be opposite to the orthogonal wall surface.

8. The electrical horn according to claim 7, wherein
the orthogonal wall surface is provided in a part of the parallel wall portion such that a protruding dimension protruding from the parallel wall portion is gradually increased as toward a tip end of the trumpet portion in a first circumferential direction, and
the protruding wall part is provided in a part of the parallel wall portion such that a protruding dimension protruding from the parallel wall portion is gradually increased as toward the tip end of the trumpet portion in a second circumferential direction opposite to the first circumferential direction.

9. The electrical horn according to claim 1, wherein
the trumpet portion includes a cover part that protrudes from a wall surface approximately perpendicular to the orthogonal wall surface and covers a part of the parallel wall portion.

10. The electrical horn according to claim 9, wherein the orthogonal wall surface and the cover part are configured together with the parallel wall portion to define an opening.

11. The electrical horn according to claim 10, wherein
the resonance tube includes a protruding wall part protruding from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to be opposite to the orthogonal wall surface, and
the cover part and protruding wall part define an opening that is larger than an open area of the sonic outlet portion provided in the orthogonal wall surface.

12. An electrical horn comprising:
a horn housing;
an oscillation member fixed to the horn housing to generate a sonic wave; and
a resonance tube in which the sonic wave generated by the oscillation member flows,
wherein the resonance tube has a plurality of sonic outlet portions that are open in different directions,
the resonance tube includes a scroll portion defining a sonic passage, and a trumpet portion continuously extending from the scroll portion to define the sonic passage,
the scroll portion has a parallel wall portion parallel with the oscillation member,
the trumpet portion has an orthogonal wall surface that extends from the parallel wall portion perpendicularly to a surface of the parallel wall portion to define the sonic passage,
one of the sonic outlet portions is open at a tip end of the trumpet portion, and the other one of the sonic outlet portions is open in the orthogonal wall surface of the trumpet portion, and
the parallel wall portion is configured to reflect a part of sonic wave flowing out of the other one of the sonic outlet portions.

13. The electrical horn according to claim 12, wherein
the other one of the sonic outlet portions is located to face the scroll portion.

14. The electrical horn according to claim 12, wherein
the other one of the sonic outlet portions is located upstream of the one of the sonic outlet portions in a flowing direction of the sonic wave in the sonic passage.

15. An electrical horn comprising:
a horn housing;
an oscillation member fixed to the horn housing to generate a sonic wave; and
a resonance tube in which the sonic wave generated by the oscillation member flows,
wherein the resonance tube has a plurality of sonic outlet portions that are open in different directions,
the resonance tube includes a scroll portion defining a sonic passage, and a trumpet portion continuously extending from the scroll portion to define the sonic passage,
the scroll portion has a parallel wall portion parallel with the oscillation member,
one of the sonic outlet portions is open at a tip end of the trumpet portion, and the other one of the sonic outlet portions is open in a wall surface of the trumpet portion that is perpendicular to a surface of the parallel wall portion.

16. The electrical horn according to claim 15, wherein
the other one of the sonic outlet portions is located to face the scroll portion.

17. The electrical horn according to claim 15, wherein
the other one of the sonic outlet portions is located upstream of the one of the sonic outlet portions in a flowing direction of the sonic wave in the sonic passage.

18. The electrical horn according to claim 15, wherein
the parallel wall portion is configured to reflect a part of sonic wave flowing out of the other one of the sonic outlet portions.

19. The electrical horn according to claim 15, wherein
the wall surface of the trumpet portion extends from the parallel wall portion perpendicularly to a surface of the parallel wall portion, and
the other one of the sonic outlet portions is open in the wall surface of the trumpet portion.

20. The electrical horn according to claim 15, wherein
the wall surface of the trumpet portion extends from the parallel wall portion perpendicularly to a surface of the parallel wall portion, and
the other one of the sonic outlet portions is open in a wall surface of the trumpet portion, other than the wall surface.