JP2018037917A - Speaker box and moving apparatus mounted with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker box superior in sound emitting performance and water removal performance.SOLUTION: The speaker box includes: a box part (2) which houses a speaker (4); and a lid part (3) for covering an opening of the box part (2). In a front opening (9) of the lid part (3), a grille (8) which is formed with many hexagonal water removal holes (7) each of which has a hole area the same as a round hole of 6.0-9.0 mm in diameter.SELECTED DRAWING: Figure 4

Description

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

  For example, in an electric vehicle, a vehicle approach alarm device is mounted to notify a pedestrian or the like of the approach of the vehicle. The vehicle approach alarm 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 shown in Patent Document 1 includes a box portion 22 and a lid portion 24 that closes an opening portion 23 of the box portion 22. Reference numeral 25 denotes a speaker built in the speaker box 21.

  In the case of the speaker box 21, since the electric vehicle is installed at a location where splashes such as rainwater from the road surface splashed up while traveling, the lid 24 protects the speaker 25 and the speaker. 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 compartment, not in a poor environment where rainwater is applied like a vehicle approach warning device. In this speaker mounting structure, it is described that reinforcing ribs are provided on the rear surface of the speaker grill in order to compensate for a decrease in rigidity of the speaker grill in which a large number of small holes as sound emitting holes are formed. Specifically, zigzag reinforcing ribs or hexagonal reinforcing ribs are described. The reinforcing rib can prevent the speaker grill from being recessed when the speaker grill is pressed, but the interval or the size of the hexagonal hole is much smaller than the small hole as the sound emitting hole of the speaker grill. Large, the reinforcing rib alone cannot protect the speaker.

JP 2014-220670 A JP2015-019251A

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

  Therefore, if the louver 26 provided in the lid portion 24 of Patent Document 1 is insufficient in sound emission performance, the louver 26 in place of the louver 26 is disposed on the front surface of the lid portion 24 as shown in FIG. Although it is conceivable to form a large number of drain holes 7A having a round hole with a diameter of about 8.0 mm, which is larger than that of the sound hole, the water draining performance can be improved simply by changing the size of the holes. There wasn't.

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

  The speaker box of the present invention is provided with a box portion that accommodates a speaker, and a lid portion that closes the opening portion of the box portion, and a round hole having a diameter of 6.0 mm to 9.0 mm is formed in the front opening portion of the lid portion. A grill having a large number of hexagonal drain holes having an equivalent hole area is provided.

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

1 is an external 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 The front view of the speaker box of embodiment of this invention Schematic of a mobile device equipped with a speaker box according to an embodiment of the present invention Front view of grill of comparative example 1 Front view of grill of comparative example 2 Sectional view of a conventional speaker box An enlarged view of a drain hole 7A having a round hole with a diameter of 8.0 mm and a drain hole 7B having a hole area slightly larger than the drain hole 7A. An enlarged view of a drain hole 7A having a diameter of 8.0 mm and a drain hole 7C having a hole area slightly smaller than the drain hole 7A.

  Hereinafter, the speaker box of the invention will be described based on 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 and closing the opening of the box portion 2. As shown in FIG. 2, a speaker 4 is built in the box portion 2 to which the lid portion 3 is attached. As shown in FIG. 3, the box portion 2 is formed with an annular recess 5 corresponding to the rear outer peripheral portion of the speaker 4. An O-ring 6 is set in the 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.

  In addition, since the synthetic resin box 2 and the lid 3 are required to have heat resistance, strength and rigidity, a synthetic resin excellent in heat resistance, strength and rigidity is selected, and a reinforcing filler such as glass fiber is used. You may shape | mold by adding.

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

  As for the shape of the hexagonal drain hole 7, the strength can be improved as compared with the round drain hole due to the effect of the honeycomb shape.

  Therefore, the amount of the synthetic resin to be 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 constant pitches. One shape of the drainage hole 7 is a hexagon having a hole area equivalent to a round hole having a diameter of 6.0 mm to 9.0 mm, and the annular frame 10 that partitions the drainage holes 7 as indicated by an imaginary line. Consists of continuous. The annular frame 10 has a side 11 and a corner 12 to which the side 11 and the side 11 are connected, and when the front opening 9 is circular, the lower end of the front opening 9 has a side 11 portion. An annular frame 10 is connected to the inner peripheral surface of the front opening 9.

  FIG. 5 shows a mobile device equipped with the speaker box 1 as a vehicle approach warning device.

  Note that an electronic device (not shown) that generates a signal to be supplied to the speaker 4 can be implemented either in the box 2 or not in the box 2.

  Although the mobile device 13 will be described as an electric vehicle, the mobile 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, an electric bicycle, a 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.

  The implementation product of FIG. 4 and the speaker box 1 of Comparative Example 1 of FIG. 6 were mounted on the mobile device 13, and a verification experiment was performed. The drain hole 7 of the implementation product was a hexagon having a hole area equivalent to a round hole having a diameter of 8.0 mm, and the drain hole 7A of Comparative Example 1 was a round hole having a diameter of 8.0 mm.

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

  As a result, good sound emission characteristics were obtained for both the product and Comparative Example 1. About drainage performance, even if it was a case where rain water did not flow out sufficiently in Comparative Example 1, good drainage performance was confirmed in the implemented product. In the case of the drain hole 7A whose shape is a round hole, it seems that the drainage performance is deteriorated due to the influence of the surface tension due to rainwater generated around the drain hole 7A. On the other hand, since the shape of the drain hole 7 is hexagonal in the product, the magnitude of the surface tension due to rainwater generated around the drain hole 7 is smaller than that of the round hole of Comparative Example 1. This is probably because of this.

  When the drainage performance of the drainage hole 7 having a hexagonal shape (a side of 3.30 mm) in the case where the drainage hole 7 has a hole area equivalent to a round hole having a diameter of 6.0 mm is confirmed, it is almost good. The water draining performance was confirmed. When the size of the water drain hole 7 was set to the same hole area as that of a round hole having a diameter of less than 6.0 mm, the deterioration of the water drain performance was confirmed. When the drain hole 7 has a hole area equivalent to a round hole with a diameter of 9.0 mm, the drain hole 7 having a hexagonal shape (with a side of 4.95 mm) is equivalent to a round hole with a diameter of 8.0 mm. The same performance as in the case of the area was confirmed, but when the drain hole 7 had a hole area equivalent to a round hole larger than a diameter of 9.0 mm, a decrease in strength of the grill 8 was confirmed.

  FIG. 7 shows Comparative Example 2. In this comparative example 2, only the connection state to the inner peripheral surface of the front opening 9 of the annular frame 10 of the grill 8 at the lowermost end of the front opening 9 of the lid 3 is different from FIG. The same. In Comparative Example 2, the corner portion 12 of the annular frame 10 is connected to the inner peripheral surface at the lowermost end of the front opening 9. In this case, since the area B of the drain hole 7 at the lowermost end of the front opening 9 is smaller than that of the implemented product, the drainage performance was deteriorated as compared with the implemented product.

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

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

  As described above, the recess 2 is formed in the aforementioned box portion 2 corresponding to the outer peripheral portion of the back surface of the speaker 4, and the O-ring 6 is provided to be elastically deformed and sealed to enter the inside of the box portion 2. Water intrusion can be prevented, while water intrusion into the grill 8 can be easily discharged to the outside by reducing the surface tension of the water due to 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 or 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 a door mirror housing, in a bumper, or in a trunk room.

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

  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 severe environments exposed to water.

DESCRIPTION OF SYMBOLS 1 Speaker box 2 Box part 3 Cover part 4 Speaker 5 Recessed part 6 O-ring 7 Drain hole 8 Grill 9 Front opening A Up direction of attachment 10 Annular frame 11 Side 12 Corner part 13 Mobile device 14 Motor 15 Motor room 16 Screw

Claims (7)

A box that houses a speaker;
Providing a lid for closing the opening of the box;
A speaker box provided with a grille having hexagonal water drainage holes having a hole area equivalent to a round hole having a diameter of 6.0 mm to 9.0 mm at a front opening of the lid.   The grill is composed of a series of annular frames that divide the hexagonal drain holes, the annular frame has sides and corners to which the sides are connected, and the front opening The speaker box according to claim 1, wherein at the lowermost end, the annular frame is connected to an 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 back 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.   A mobile device equipped with the speaker box according to claim 1.   The mobile device according to claim 5, wherein the mobile device is composed of an interior and an exterior, and the speaker box is mounted outside the mobile device.   The mobile device according to claim 6, wherein the speaker box is mounted in a motor room or an engine room of the mobile device.

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