JP6731649B2 - Speaker box - Google Patents

Description

The present invention relates to a speaker box containing a speaker.

For example, an electric vehicle is equipped with a vehicle approach warning device to notify a pedestrian of the approach of the vehicle. The vehicle approach warning device includes a speaker, a speaker box that houses the speaker, and an electronic circuit that drives the speaker.

As shown in FIG. 8, the speaker box 21 seen in Patent Document 1 includes a box portion 22 and a lid portion 24 that closes an opening 23 of the box portion 22. Reference numeral 25 is a speaker built in the speaker box 21.

In the case of the speaker box 21, since the electric vehicle is installed at a place where splashes of rainwater and the like are splashed from the road surface that is jumped up while the electric vehicle is running, the speaker 24 is protected by the lid portion 24 and at the same time. It is required that the alarm sound emitted from 25 can be sufficiently emitted. Therefore, a louver 26 is formed on the lid 24 so as to hide the opening 23.

Patent Document 2 describes a speaker mounting structure provided on an instrument panel in a vehicle interior, not under a bad environment such as a vehicle approach warning device where rainwater is splashed. In this speaker mounting structure, it is described that a reinforcing rib is provided on the back surface of the speaker grill in order to compensate for the decrease in rigidity of the speaker grill having a large number of small holes as sound output holes. Specifically, a zigzag reinforcing rib or a hexagonal reinforcing rib is described. The reinforcing rib can prevent the speaker grill from being depressed when the speaker grill is pressed, but the spacing or the size of the hexagonal holes is much larger than the small holes as the sound emitting holes of the speaker grill. It is large, and the reinforcing ribs alone cannot protect the speaker.

JP, 2014-220670, A JP, 2005-019251, A

In the louver 26 provided in the lid portion 24 of Patent Document 1, unnecessary directivity is generated in the sound emitting direction. Further, when the speaker grill of Patent Document 2 is adopted instead of the louver 26, good sound emission can be realized, but rainwater that has entered from the speaker grill does not flow out from the small sound emission hole. Therefore, the drainage performance deteriorates.

Therefore, when the louver 26 provided in the lid portion 24 of Patent Document 1 is insufficient in sound emission performance, the louver 26 is replaced by the louver 26 shown in FIG. It is conceivable to form a large number of water draining holes 7A, which are round holes having a diameter of about 8.0 mm, which is larger than the sound holes, but it is possible to improve the water draining performance by simply changing the size of the holes. There wasn't.

Therefore, it is an object of the present invention to provide a speaker box having good sound emission performance and good water drainage performance.

Speaker box of the present invention is a mounted on the speaker box to the mobile device, and a box portion for accommodating a speaker, and a lid is provided for closing the opening portion of the box portion, front opening of the lid portion the provided grill forming a plurality of drainage holes in the hexagonal equivalent pore area and round hole of diameter 6.0Mm～9.0Mm, the mobile unit is composed of a room and the outdoor, the speaker The box is mounted outside the mobile device, and the speaker box is mounted in a motor room or an engine room of the mobile device .

According to this structure, since the grill has a large number of hexagonal drain holes having a hole area equivalent to that of the round holes having a diameter of 6.0 mm to 9.0 mm, the sound emitting performance is good and the drainage is good. A speaker box with good performance can be realized.

1 is a perspective view of a speaker box according to an embodiment of the present invention. Sectional drawing of the speaker box of embodiment of this invention Partial enlarged sectional view of the speaker box Front view of a speaker box according to an embodiment of the present invention 1 is a schematic diagram of a mobile device equipped with a speaker box according to an embodiment of the present invention. Front view of the grill of Comparative Example 1 Front view of the grill of Comparative Example 2 Cross-sectional view of conventional speaker box Enlarged view of a water draining hole 7A having a diameter of 8.0 mm and a water draining hole 7B having a hole area slightly larger than that of the water draining hole 7A. Enlarged view of a water draining hole 7A having a diameter of 8.0 mm and a water draining hole 7C having a hole area slightly smaller than that of the water draining hole 7A.

Hereinafter, the speaker box of the present invention will be described based on the embodiments.

FIG. 1 is an external perspective view of a speaker box 1 according to an embodiment of the present invention. The speaker box 1 has a box portion 2 made of synthetic resin and a lid portion 3 made of synthetic resin for closing the opening of the box portion 2. The box 2 to which the lid 3 is attached has a speaker 4 built therein as shown in FIG. As shown in FIG. 3, the box portion 2 is formed with an annular recess 5 corresponding to the outer peripheral portion of the back surface of the speaker 4. An O-ring 6 is set in this recess 5, and the O-ring 6 is elastically deformed and sealed by attaching the lid 3 to the box 2 with screws 16.

With this configuration, it is possible to prevent water from entering the inside of the box portion 2.

Further, since the synthetic resin box 2 and the lid 3 are required to have heat resistance, strength and rigidity, a synthetic resin having excellent heat resistance, strength and rigidity should be selected and a reinforced filler such as glass fiber. May be added for molding.

A grill 8 having a large number of hexagonal drainage holes 7 is integrally formed with the front opening 9 of the lid 3 in the resin-molded lid 3.

Regarding the shape of the hexagonal water draining hole 7, the strength can be improved as compared with the round water draining hole due to the effect of the honeycomb shape.

Therefore, the amount of synthetic resin used can be reduced, the aperture ratio can be further increased, and the weight can be further reduced.

FIG. 4 shows a front view of the speaker box mounting posture. The direction of arrow A is the upward direction of the mounting posture.

The grill 8 has a plurality of drain holes 7 arranged at regular intervals and at a constant pitch. One shape of the water draining holes 7 is a hexagon having a hole area equivalent to that of a round hole having a diameter of 6.0 mm to 9.0 mm, and an annular frame 10 for partitioning the water draining holes 7 as shown by an imaginary line. It is composed of continuous lines. The annular frame 10 has a side 11 and a corner 12 connecting the side 11 and the side 11, and when the front opening 9 is circular, at the lowermost end of the front opening 9, the side 11 The annular frame 10 is connected to the inner peripheral surface of the front opening 9.

FIG. 5 shows a mobile device in which the speaker box 1 is mounted as a vehicle approach warning device.

An electronic device (not shown) that generates a signal to be supplied to the speaker 4 may be implemented in either the box unit 2 or the box unit 2.

Although the moving body device 13 is described as an electric vehicle, the moving body device 13 may be a vehicle driven by an engine or a hybrid type vehicle equipped with an engine and a motor. Furthermore, the mobile device 13 is not limited to an automobile. For example, a motorcycle, electric bicycle, forklift, etc. may be used.

The speaker box 1 is attached to a motor room 15 in which a motor 14 that is a power source of the mobile device 13 is installed.

FIG. 6 shows Comparative Example 1. This comparative example 1 is the same as FIG. 4 except that one shape of the drain hole 7A is a round hole.

4 was implemented and the speaker box 1 of the comparative example 1 of FIG. 6 was mounted in the mobile device 13, and the verification experiment was conducted. The water drainage holes 7 of the embodiment were hexagonal having the same hole area as the round holes having a diameter of 8.0 mm, and the water drainage holes 7A of Comparative Example 1 were round holes having a diameter of 8.0 mm.

In addition, the hexagonal water draining hole 7 having a hole area equivalent to that of the circular hole having the diameter of 8.0 mm of the embodiment is the water draining hole having the diameter of 8.0 mm like the water draining hole 7B shown in FIG. There is a hexagon having a shape slightly larger than the hole area of the hole 7A or slightly smaller than the drainage hole 7C shown in FIG. As described above, the apex T of the hexagonal water drain holes 7B and 7C of the embodiment is located outside the water drain hole 7A of Comparative Example 1 (round hole having a diameter of 8.0 mm), and the hexagonal water drain holes are formed. Part of the side OS of 7B and 7C is a hexagon located inside the drainage hole 7A. Here, as a specific example, an experiment was conducted in which one side of the hexagon of the drainage hole 7 was 4.40 mm.

As a result, good sound emission characteristics were obtained for both the product and Comparative Example 1. Regarding the drainage performance, even in the case where the rainwater did not sufficiently flow out in Comparative Example 1, good drainage performance was confirmed for the implemented product. This is because, in the case of the water drainage hole 7A having a round shape, it is considered that the water drainage performance is deteriorated due to the influence of the surface tension of the rainwater generated around the water drainage hole 7A. On the other hand, in the embodiment, since the drainage hole 7 has a hexagonal shape, the magnitude of surface tension due to rainwater generated around the drainage hole 7 is smaller than that of the round hole of Comparative Example 1. It is thought to be because.

When the drainage performance of the hexagonal (3.30 mm on a side) drainage hole 7 is confirmed when the size of the drainage hole 7 is the same as that of a round hole having a diameter of 6.0 mm, it is found to be almost good. It was confirmed that the water drainage performance was good. When the size of the water drainage hole 7 was made equal to that of a round hole having a diameter of less than 6.0 mm, deterioration of the water drainage performance was confirmed. The hexagonal (4.95 mm on each side) water draining hole 7 is the same as a round hole having a diameter of 8.0 mm when the size of the water draining hole 7 is the same as a circular hole having a diameter of 9.0 mm. The same performance as in the case of the area was confirmed, but when the size of the water drainage hole 7 was made equal to that of a round hole having a diameter of 9.0 mm or more, the strength reduction of the grill 8 was confirmed.

FIG. 7 shows Comparative Example 2. In this comparative example 2, only the connection state of the grille 8 at the lowermost end of the front opening 9 of the lid 3 to the inner peripheral surface of the front opening 9 of the annular frame 10 is different from that of FIG. Is the same. In Comparative Example 2, the corner 12 of the annular frame 10 is connected to the innermost surface at the lowermost end of the front opening 9. In this case, the area B of the water drainage hole 7 at the lowermost end of the front opening 9 was smaller than that in the case of the practical product, so that the water drainage performance was worse than that of the practical product.

With these configurations, the present invention reduces the surface tension of water by the hexagonal hole shape even if water enters the inside of the grill 8 due to splashes of rainwater or the like from the road surface that is splashed up while traveling. Therefore, it can be easily discharged to the outside.

Therefore, since water does not remain inside the grill 8 for a long period of time, it is possible to remarkably suppress deterioration of water-sensitive parts such as the diaphragm.

As described above, the box portion 2 is provided with the recess 5 corresponding to the outer peripheral portion of the back surface of the speaker 4, and the O-ring 6 is provided to elastically deform and seal the inside of the box portion 2. Water can be prevented from entering, while water can be easily discharged to the outside by reducing the surface tension of water by using the hexagonal hole shape.

Therefore, it is very useful for a speaker box used in a severe environment exposed to water such as a motor room and an engine room.

The installation location of the speaker box 1 is not limited to the motor room 15. For example, it may be installed in the housing of the door mirror, the bumper, or the trunk room.

The speaker box 1 is not limited to the vehicle approach warning device. For example, it may be used in a pseudo engine sound generating device or an active noise reducing device.

INDUSTRIAL APPLICABILITY The speaker box of the present invention can realize good sound emission characteristics and drainage performance, and contributes to improvement of long-term reliability of various devices used in a severe environment exposed to water.

1 Speaker Box 2 Box Part 3 Lid Part 4 Speaker 5 Recess 6 O-Ring 7 Drain Hole 8 Grill 9 Front Opening A A Mounting Position Upward 10 Annular Frame 11 Side 12 Corner 13 Mobile Device 14 Motor 15 Motor Room 16 Screw

Claims (4)

A speaker box mounted on a mobile device, comprising:
A box containing the speaker,
And the lid is provided for closing the opening portion of the box portion,
The front opening of the lid is provided with a grill having a large number of hexagonal drainage holes having a hole area equivalent to a round hole having a diameter of 6.0 mm to 9.0 mm ,
The mobile device comprises an indoor and an outdoor, a speaker box is mounted outside the mobile device,
The speaker box is a speaker box installed in the motor room or engine room of the mobile device . The grill is composed of a series of annular frames that partition between the hexagonal water drainage holes, and the annular frame has sides and corners connecting the sides, and the front opening of The speaker box according to claim 1, wherein at the lowermost end, the annular frame is connected to the inner peripheral surface of the front opening at the side portion. The speaker box according to claim 1, wherein a concave portion is formed in the box portion corresponding to the outer peripheral portion of the rear surface of the speaker, and an O ring is provided in the concave portion. The speaker box according to claim 3, wherein the O-ring is elastically deformed and sealed.

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