JP7165031B2 - speaker system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a speaker system, and more particularly to the structure of a member that covers the front surface of a speaker.

Automobiles are equipped with accessory devices such as audio equipment, radio receivers, and car navigation systems. Audio from these accessory devices is emitted from in-vehicle speakers attached to the instrument panel or door.

There are various in-vehicle speakers according to their uses. For example, Patent Document 1 describes an in-vehicle surround system using six speakers. Patent Documents 2 and 3 describe directional speakers in which sound is directed in a specific direction.

JP 2006-186925 A JP 2013-173430 A JP 2017-193207 A

In car navigation systems and mobile phone hands-free systems, it may be desirable to direct audio to the occupants in the driver's and front passenger's seats and not to the occupants in the rear seats. In this case, it is also conceivable to use a directional speaker as described in Patent Documents 2 and 3. However, the directional speaker has a problem that the structure is complicated and the cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to emit sound in a specific direction from a speaker with a simple structure.

The present invention comprises a speaker and a cover covering the front of the speaker, wherein the cover includes a front area covering the front surface of the speaker, an outer area protruding outside the front surface of the speaker, and the front area. an acoustic hole provided in the outer region, a wraparound hole that communicates between a region in front of the speaker and a region behind the speaker; and an engaging portion that passes through and engages with a fixing member in the automobile, wherein the automobile is provided with a fixing plate facing the rear surface of the speaker as the fixing member, and the engaging portion is attached to the speaker. The fixing plate is engaged with the fixing plate with a gap left between the rear surface and the front surface of the fixing plate .

Desirably, the sound emitted to the front of the speaker and reaching the rear of the speaker through the wraparound hole and the sound emitted to the rear of the speaker and reaching the front of the speaker through the wraparound hole are compatible with each other. Kill each other or reduce each other.

According to the present invention, sound can be emitted from a speaker in a specific direction with a simple structure.

1 is a perspective view of an in-vehicle speaker system; FIG. 1 is a top view of an in-vehicle speaker system; FIG. 1 is an exploded perspective view of an in-vehicle speaker system; FIG. 1 is a cross-sectional view of an in-vehicle speaker system; FIG. 1 is a cross-sectional perspective view of an in-vehicle speaker system; FIG. FIG. 10 is a diagram showing a modification of the in-vehicle speaker system;

FIG. 1 shows a perspective view of an in-vehicle speaker system 1 according to an embodiment of the invention. 2 shows a top view of the in-vehicle speaker system 1. As shown in FIG. The terms of up, down, left, and right in the following description indicate the direction when the vehicle interior side is viewed from the speaker 10 . In each figure, the forward direction is defined as the x-axis positive direction. Also, the left direction (right direction in the drawing) when viewed from the speaker 10 in the passenger compartment is defined as the positive direction of the y-axis, and the upward direction when viewed from the speaker 10 in the passenger compartment (the direction toward the front from the drawing) is defined as the z-axis. Defined as the positive direction.

The in-vehicle speaker system 1 is installed on the ceiling of a vehicle, an instrument panel, a door, or the like, and is used for accessory equipment that emits sound, such as an audio device, a radio receiver, and a car navigation system. The speaker is arranged inside the speaker fixing wall 14 and the front of the speaker is covered with the cover 12 . The cover 12 is provided with an acoustic hole 18 through which sound emitted from the speaker passes, and a wraparound hole 20 for communicating the front and rear regions of the speaker. In the in-vehicle speaker system 1 shown in FIG. 1 , the two holes on the left side and the two holes on the right side provided in the cover 12 are the wraparound holes 20 . Eleven holes sandwiched between the left and right wraparound holes 20 are acoustic holes 18 . As will be described later, the in-vehicle speaker system 1 emits sound forward due to the provision of the wrap-around hole 20 .

FIG. 3 shows an exploded perspective view of the in-vehicle speaker system 1. As shown in FIG. The in-vehicle speaker system 1 includes a speaker 10 , a cover 12 and a speaker fixing wall 14 . The speaker fixing wall 14 may be a part of the ceiling of the passenger compartment, the instrument panel, the door, the headrest of the seat, or the like. The speaker fixing wall 14 is provided with a substantially rectangular speaker receiving hole 16 formed by rounding the corners of a rectangular shape elongated in the left-right direction.

Two engaging portions 22L arranged in the front-rear direction are provided on the left side of the rear surface of the cover 12 . The engaging portion 22L includes a columnar portion 26L extending rearward from the rear surface of the cover 12 and a hook portion 28L formed at the rear end of the columnar portion 26L. The catch portion 28L has a shape that becomes thicker leftward as it goes forward from the rear end, and forms a jaw shape together with the side surface of the columnar portion 26L at the boundary with the columnar portion 26L. On the back surface of the cover 12, a left protruding wall 32L is formed on a line connecting the two engaging portions 22L on the left side.

Similarly, on the right side of the rear surface of the cover 12, two engaging portions 22R are arranged in the front-rear direction. The engaging portion 22R is composed of a columnar portion 26R extending rearward from the rear surface of the cover 12 and a hook portion 28R formed at the rear end of the columnar portion 26R. The catch portion 28R has a shape that becomes thicker rightward as it goes forward from the rear end, and forms a jaw shape together with the side surface of the columnar portion 26R at the boundary with the columnar portion 26R. On the back surface of the cover 12, a right protruding wall 32R is formed on a line connecting the two engaging portions 22R on the right side.

Between the left projecting wall 32L and the right projecting wall 32R, 11 acoustic holes 18 are arranged in the horizontal direction. Two wraparound holes 20 are arranged in the left-right direction on the left side of the left protruding wall 32L and on the right side of the right protruding wall 32R. The acoustic hole 18 and the wraparound hole 20 in this embodiment are formed by slits whose longitudinal direction is the short side direction of the cover 12 .

The speaker 10 is formed in a substantially rectangular plate shape elongated in the left-right direction with the front-rear direction as the thickness direction. Between the left protruding wall 32L and the right protruding wall R at the rear of the cover 12, a space corresponding to the lateral length of the speaker 10 is provided. The speaker 10 is fixed between the left protruding wall 32L and the right protruding wall R.

The cover 12 is overlaid on the speaker fixing wall 14 so that each wraparound hole 20 and each acoustic hole 18 overlaps the speaker receiving hole 16 in the speaker fixing wall 14 . The two engaging portions 22L on the left side and the two engaging portions 22R on the right side pass through the speaker receiving hole 16 from front to rear.

The fixing plate 24 may be an automobile body or an interior member provided in the passenger compartment. The fixing plate 24 is provided with a substantially rectangular fixing hole 30 elongated in the left-right direction. The hooking portions 28L of the two left engaging portions 22L are hooked (engaged) with the left edge of the fixing hole 30, and the hooking portions 28R of the two right engaging portions 22R are also fixed. It hooks (engages) the right edge of hole 30 . As a result, the cover 12 is fixed to the fixing plate 24 while the speaker 10 is fixed to the cover 12 . The rear surfaces of the left and right ends of the cover 12 may be joined to the front surfaces of the speaker fixing wall 14 near the left and right edges of the speaker receiving hole 16 with an adhesive or the like.

FIG. 4 shows a cross section taken along line AA in FIG. FIG. 5 shows a perspective view showing a cross section taken along line AA in FIG. A cross-sectional structure of the in-vehicle speaker system 1 will be described with reference to these drawings.

A front side of the speaker 10 is covered with a cover 12 . The cover 12 is formed in a substantially rectangular plate shape that is wider than the front surface of the speaker 10 and elongated in the left-right direction. A front area that contacts and covers the front surface of the speaker 10 is provided with a plurality of acoustic holes 18 through which the sound emitted from the speaker 10 passes. Note that the front area does not necessarily have to be in contact with the front surface of the speaker 10, and may face the front surface of the speaker 10 with a predetermined distance therebetween.

Engaging portions 22L and 22R projecting from the left and right sides of the speaker 10 are formed on the rear surface of the cover 12. As shown in FIG. The right engaging portion 22R of the speaker 10 penetrates the speaker receiving hole 16 with a gap left between it and the right edge of the speaker receiving hole 16. - 特許庁The left engaging portion 22L of the speaker 10 penetrates the speaker receiving hole 16 leaving a gap between it and the left edge of the speaker receiving hole 16. - 特許庁

Two wraparound holes 20 are provided in front of the speaker receiving hole 16 on the right side of the engaging portion 22R on the right side of the speaker 10 . Two wraparound holes 20 are also provided in front of the speaker receiving hole 16 on the left side of the engaging portion 22L on the left side of the speaker 10. As shown in FIG. That is, the cover 12 is provided with the wrap-around holes 20 in the left and right outer regions protruding to the left and right outer sides of the front surface of the speaker 10 . Each wrap-around hole 20 allows the area in front of the speaker 10 and the area behind the speaker 10 to communicate with each other.

The in-vehicle speaker system 1 is fixed to a fixing plate 24 of the automobile. The fixing plate 24 faces the left and right outer regions of the cover 12 across the speaker receiving hole 16 and further faces the rear surface of the speaker 10 . Left and right engaging portions 22L and 22R of speaker 10 are engaged with fixing plate 24 with a gap left between the rear surface of speaker 10 and the front surface of fixing plate 24 . That is, each of the engaging portions 22L and 22R extends rearward from the rear surface of the outer region of the cover 12, passes through the side of the speaker 10, and engages with a fixing plate 24 as a fixing member. Each of the engaging portions 22L and 22R penetrates from the front to the rear through a fixing hole 30 formed in the fixing plate 24 and engages with the fixing plate 24 . Thereby, the cover 12 is fixed to the fixing plate 24 together with the speaker 10 .

A wraparound path 34L is formed from the rear of each acoustic hole 18 to the left wraparound hole 20 . The wraparound path refers to a propagation path in which sound wraps back and forth by connecting the area in front of the speaker 10 and the area behind the speaker 10 with the wraparound hole 20 . Namely, the route from the rear of speaker 10 through the space between fixing plate 24 and speaker fixing wall 14, through speaker receiving hole 16 and left wraparound holes 20, to the front of speaker 10, and in the opposite direction. A path is formed as a wraparound path 34L.

Similarly, a wraparound path 34R is also formed from the rear of each sound hole 18 to each wraparound hole 20 on the right side. That is, the path from the rear of speaker 10 to the front of speaker 10 through the space between fixing plate 24 and speaker fixing wall 14, through speaker receiving hole 16 and each wraparound hole 20 on the right side, and vice versa. The route is formed as a roundabout route 34R.

The principle of operation of the in-vehicle speaker system 1 will be described with reference to FIG. Sound emitted from the speaker 10 is emitted forward through the plurality of sound holes 18 . A part of the sound emitted forward enters the left wraparound hole 20 from the front, propagates through the left wraparound path 34L, and wraps around to the rear of the speaker 10.例文帳に追加Similarly, part of the sound emitted forward enters the right wraparound hole 20 from the front, propagates through the right wraparound path 34R, and wraps around to the rear of the speaker 10 .

On the other hand, the speaker 10 emits sound not only to the front but also to the rear. A part of the sound emitted backward propagates through the left wraparound path 34L and is emitted forward from the left wraparound hole 20 . Further, another part of the sound emitted backward propagates through the right wraparound path 34R and is emitted forward from the right wraparound hole 20 .

In general, the sound emitted to the rear of the speaker 10 has an anti-phase relationship with respect to the sound emitted to the front. Therefore, the rearward sound that is emitted in front of the speaker 10 and propagates through the left and right wraparound paths (34L, 34R) and wraps around to the rear of the speaker 10, and the left and right wraparound paths (34L, 34R) that are emitted behind the speaker 10. The forward wraparound sound that propagates and wraps around in front of the speaker 10 has an opposite phase relationship. Therefore, when the levels of the rearward roundabout sound and the front roundaround sound are the same or similar, the rearward roundabout sound and the front roundabout sound cancel each other out or reduce each other. As a result, the in-vehicle speaker system 1 emits a loud sound forward.

Therefore, in the present embodiment, the number, size, shape, etc. of the loop-around holes 20 are determined so that the level of the backward loop-around sound and the level of the front loop-around sound are the same or similar in front of the speaker 10. there is As a result, the in-vehicle speaker system 1 emits a loud sound forward.

Moreover, the sound emitted forward from the speaker 10 through the sound hole 18 is sound in the high range of the audible frequency band, and often tends to be strongly rectilinear. On the other hand, the backward wraparound sound and the front wraparound sound are sounds in the low range of the audible frequency band, and often tend to be highly diffusive. In the in-vehicle speaker system 1 according to the present embodiment, since the rearward sound and the frontward sound are suppressed, straight-traveling high-pitched sounds and straight-traveling components of low-pitched sounds are emitted forward. . This increases the straightness of the sound emitted from the in-vehicle speaker system 1 .

According to the in-vehicle speaker system 1 according to the present embodiment, loud sound can be emitted from the speaker 10 in a specific direction. This makes it easy to direct the sound of the speaker 10 to a specific position such as a driver's seat or a passenger's seat in the passenger compartment.

In the above description, an embodiment in which the wrap-around hole 20 is formed by a slit has been described. The wraparound holes 20 may be formed by circular, elliptical or polygonal microholes as shown in FIG. In this case, a plurality of fine holes are arranged on the left and right sides of the cover 12 . The number, size, shape, etc. of the micro holes are determined so that the backward wraparound sound and the front wraparound sound cancel each other out or reduce each other.

Moreover, although the speaker system for vehicle use has been described above, the speaker system according to the present invention may be used for audio equipment in an office or in a house.

1 in-vehicle speaker system 10 speaker 12 cover 14 speaker fixing wall 16 speaker receiving hole 18 acoustic hole 20 wraparound hole 22L, 22R engaging portion 26L, 26R columnar portion 28L, 28R hooking portion 24 fixing Plate, 30 fixing hole, 32L left protruding wall, 32R right protruding wall, 34L, 34R wraparound path.

Claims (2)

a speaker;
a cover covering the front of the speaker,
The cover is
a front area covering the front surface of the speaker;
an outer region protruding outside the front surface of the speaker;
an acoustic hole provided in the front region;
a wraparound hole provided in the outer region and communicating between a region in front of the speaker and a region behind the speaker;
an engaging portion that extends rearward from the rear surface of the outer region, passes through the side of the speaker, and engages a fixing member in the automobile ,
The automobile is provided with a fixing plate facing the rear surface of the speaker as the fixing member,
The speaker system , wherein the engaging portion engages with the fixing plate with a gap left between the rear surface of the speaker and the front surface of the fixing plate . The speaker system according to claim 1, wherein
Sound emitted in front of the speaker and reaching the rear of the speaker through the wraparound hole cancels out sound emitted in the rear of the speaker and reaches the front of the speaker through the wraparound hole, or A speaker system characterized by mutual reduction.

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