JP2019110501A - Speaker acoustic characteristic maintenance device - Google Patents

Abstract

To provide a speaker acoustic characteristic maintenance device which is capable of saving a space as a whole by reducing a thickness and a size of a speaker box.SOLUTION: A speaker acoustic characteristic maintenance device 10 comprises: a speaker body; and a speaker box 30 which surrounds a periphery of a sound generating surface of the speaker body and has a sound outlet 50. The speaker box 30 has a speaker fixing wall 31, a facing wall 35, and a peripheral wall 40. The sound outlet 50 is provided on the peripheral wall 40. The peripheral wall 40 has: a first bent portion 41 which is formed along the outer periphery of the speaker body 20 when viewed from a direction perpendicular to the speaker fixing wall 31; and second bent portions 43, 43 which are formed to spread to both sides toward the sound outlet 50. The sound outlet 50 is arranged adjacently to the outer periphery of the sound generating surface of the speaker body 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a speaker acoustic characteristic maintenance device using, for example, a speaker mounted in a car.

  Conventionally, a speaker device is disposed in a car, but there is also a structure in which the speaker device is attached to the ceiling side in the car. For example, Patent Document 1 listed below describes a speaker sound generator (a horn-like horn or the like) attached at an angle with a predetermined angle with respect to the surface direction of the ceiling wall.

  In Europe, the eCall system (vehicle emergency call system) is adopted. The eCall system automatically notifies the rescue service of relevant data such as the current position of a car when an accident occurs. This system requires that a small speaker or microphone be installed in the map lamp (the room light on the front of the vehicle) installed on the ceiling wall that is relatively hard to damage even in the event of an accident, and its operation unit. It is done. Then, when an occupant is caught in the vehicle body or the like at the time of an accident and can not move, it is possible to interact with the rescue service operator through the speaker and the microphone.

Japanese Utility Model Publication 63-114580

  In the speaker device of Patent Document 1 described above, the speaker device is attached to the ceiling wall of the vehicle, but in this speaker device, the sound generating unit is attached at a parallel angle to the surface direction of the ceiling wall Since the device mounting area is required for the speaker area, it is difficult to make the device compact, and it is difficult to arrange the device in the map lamp in the car.

  Therefore, an object of the present invention is to provide a speaker acoustic characteristic maintenance device which can reduce the thickness of the speaker box itself while maintaining the acoustic characteristics of the speaker, and can be made compact as a whole.

  In order to achieve the above object, a speaker acoustic characteristic maintenance device of the present invention comprises a speaker body having a sound generation surface, and a speaker box which surrounds the sound generation surface of the speaker body and is provided with a sound outlet. The speaker box includes: a speaker fixed wall having an opening in which the sound generation surface is disposed; an opposite wall disposed opposite to the speaker fixed wall; a periphery of the speaker fixed wall and the opposite wall And the sound outlet is provided at a predetermined position of the peripheral wall, and the peripheral wall extends along the outer periphery of the speaker body when viewed from a direction perpendicular to the speaker fixed wall. And a second curved portion formed to extend from both sides of the first curved portion toward the sound outlet, wherein the sound outlet includes the first curved portion and the second curved portion. Characterized in that it is disposed adjacent to the outer periphery of the sound generation surface of the manufacturers body.

  According to the above-mentioned invention, since the sound outlet is provided at a predetermined position of the peripheral wall of the speaker box surrounding the periphery of the sound generation surface of the speaker body, the speaker box can be thinned. In addition, since the sound outlet is disposed adjacent to the outer periphery of the sound generation surface of the speaker body, the outer diameter in the direction along the speaker fixed wall of the speaker box can be reduced, and the overall size can be reduced. Can.

  Furthermore, the peripheral wall extends from both sides of the first curved portion formed along the outer periphery of the speaker body toward the sound outlet from both sides when viewed in a direction perpendicular to the speaker fixed wall. Since it has a second curved portion formed as described above, the sound wave reflected by the inner wall of the speaker box travels to spread toward the sound outlet, and suppresses deterioration of the speaker characteristics while having a compact shape. (Ie, the overall size of the speaker can be made compact while maintaining the acoustic characteristics of the speaker).

  In the speaker acoustic characteristic maintenance device of the present invention, when viewed in a direction perpendicular to the speaker fixed wall, the first curved portion of the peripheral wall has an arc shape along the outer periphery of the speaker main body, and the peripheral wall Preferably, the second curved portion is parabolic. According to this aspect, the sound wave reflected by the inner wall of the speaker box can be more effectively spread toward the sound outlet.

  In the speaker acoustic characteristic maintenance device of the present invention, it is preferable that an inner surface of the opposing wall has a shape in which a distance to the speaker fixed wall gradually increases toward the sound outlet. According to this aspect, the sound wave reflected by the inner surface of the opposing wall can be efficiently led to the sound outlet without impairing the speaker characteristics.

  In the speaker acoustic characteristic maintenance device of the present invention, the inner surface of the opposing wall forms a parabola when viewed in a cross section perpendicular to the speaker fixed wall, passing through the widthwise center of the sound outlet. It is preferable to be in a shape. According to this aspect, since the peripheral wall of the speaker box has a sharp rise from the back side, exhaust (air vibration) can be suppressed and sound waves can be effectively guided to the sound outlet.

  In the speaker acoustic characteristic maintenance device of the present invention, it is preferable that one or a plurality of support walls connecting the speaker fixed wall and the opposite wall be formed at the center in the width direction of the sound outlet. According to this aspect, the high frequency characteristic can be tuned by the support wall.

  In the speaker acoustic characteristic maintenance device of the present invention, the speaker body is inserted into a mounting hole of a mounting panel provided in a ceiling wall of a vehicle, the speaker box protrudes from the mounting panel, and the sound outlet is a driver. It is preferable to be attached to the said mounting panel so that it may face the direction of this. According to this aspect, the speaker acoustic characteristic maintenance device can be attached to the mounting panel in a compact shape without largely projecting toward the cabin.

  According to the present invention, since the sound outlet is provided at a predetermined position on the peripheral wall of the speaker box surrounding the periphery of the sound generation surface of the speaker body, the speaker box can be thinned and the sound outlet can be Since it is disposed adjacent to the outer periphery of the sound generation surface of the speaker body, the outer diameter in the direction along the speaker fixed wall of the speaker box can be reduced, and the overall size can be reduced. Furthermore, the peripheral wall extends from both sides of the first curved portion formed along the outer periphery of the speaker body toward the sound outlet from both sides when viewed in a direction perpendicular to the speaker fixed wall. Since it has a second curved portion formed as described above, the sound wave reflected by the inner wall of the speaker box travels to spread toward the sound outlet, and suppresses deterioration of the speaker characteristics while having a compact shape. can do.

1 shows an embodiment of a speaker acoustic characteristic maintenance device according to the present invention, and is a cross-sectional explanatory view thereof. It is a perspective view of the speaker box which comprises the speaker acoustic characteristic maintenance device. It is a perspective view at the time of seeing the same speaker box from a different direction from FIG. FIG. 5 is a perspective view of the same speaker box as viewed from a direction different from FIGS. 1 and 2; It is sectional drawing in the AA of FIG. 6A is an explanatory view of the speaker box, and FIG. 6B is a cross-sectional view taken along the line B-B of FIG. The other embodiment of the speaker acoustic characteristic maintenance apparatus which concerns on this invention is shown, and it is sectional drawing of the speaker box which comprises this apparatus. The other embodiment of the speaker acoustic characteristic maintenance apparatus which concerns on this invention is shown, and it is sectional drawing of the speaker box which comprises this apparatus.

  Hereinafter, an embodiment of a speaker acoustic characteristic maintenance device according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the speaker acoustic characteristic maintenance device 10 (hereinafter also referred to as "speaker device 10") in this embodiment has a known structure such as a magnet, voice coil, cone paper (diaphragm), etc. The speaker body 20 has a sound generation surface 22 and has a circular outer periphery, and the speaker box 30 surrounding the sound generation surface 22 of the speaker body 20 and provided with a sound outlet 50.

  Further, referring also to FIGS. 2 to 5, the speaker box 30 has a circular hole-shaped opening 33 in which the sound generating surface 22 of the speaker main body 20 is disposed, and the speaker box 30 is made with respect to the speaker box 30. A speaker fixing wall 31 for fixing the speaker main body 20, an opposite wall 35 disposed opposite to the speaker fixing wall 31, a speaker fixing wall 31 and an opposite wall 35 are mutually connected, and a speaker A peripheral wall 40 surrounding the fixed wall 31 and the opposing wall 35 is provided.

  And the predetermined part of the surrounding wall 40 is opened and the sound outlet 50 is provided. In this embodiment, the sound outlet 50 is formed by opening the wall on one side of the peripheral wall 40, that is, the vehicle rear side of the peripheral wall 40. Further, the sound outlet 50 is disposed adjacent to the outer periphery of the sound generation surface 22 of the speaker main body 20 so as to spread in the tangential direction (see FIG. 1). Furthermore, in this embodiment, as shown in FIG. 2, FIG. 3 and FIG. 5, a support wall 45 connecting the speaker fixed wall 31 and the opposite wall 35 is formed at the center in the width direction of the sound outlet 50. The outlet 50 is divided into two on the left and right. Although one support wall 45 is provided in this embodiment, a plurality of support walls 45 may be provided.

  As shown in FIG. 1, the speaker main body 20 is inserted into the opening 33 of the speaker fixing wall 31 with its sound generating surface 22 facing the opposing wall 35 of the speaker box 30, and the adhesive is not shown. Is fixed to the peripheral portion of the opening 33 of the speaker fixing wall 31 by a fixing means such as a screw or the like, and a portion of the speaker main body 20 opposite to the sound generating surface 22 is a speaker box 30. It is exposed from.

  And, as shown in FIG. 5 and FIG. 6A, when viewed from a direction perpendicular to the speaker fixing wall 31 (when viewed from a direction perpendicular to the surface direction of the speaker fixing wall 31) (Similarly in the following description), the first curved portion 41 formed along the outer periphery of the speaker main body 20 and both sides of the first curved portion 41 so as to extend to both sides toward the sound outlet 50 And second curved portions 43, 43 formed.

  The first curved portion 41 passes a center C of the circular hole-shaped opening 33 and extends slightly beyond a radius R1 of the opening 33 to a line segment L passing through the circumferentially opposite side portions of the peripheral wall 40. It forms a curved surface in a circular arc shape with a large radius R2. The second curved portions 43, 43 are provided so as to extend from both sides in the circumferential direction of the first curved portion 41 toward the sound outlet 50 so as to spread on both sides. In this embodiment, the inner surfaces of the second curved portions 43, 43 are shaped to draw a parabola when viewed in a direction perpendicular to the speaker fixed wall 31. The curvature radius R3 of the second curved portions 43, 43 is set to a radius close to the radius R1, R2.

  A mounting portion 47 having a screw insertion hole 48 is provided on the outer surface side of the peripheral wall 40 and at the boundary between the first curved portion 41 and the second curved portions 43 and 43.

  Furthermore, the inner surface 36 of the opposing wall 35 is shaped such that the distance to the speaker fixed wall 31 gradually increases toward the sound outlet 50 (see FIGS. 1 and 6B). More specifically, as shown in FIG. 4 and FIG. 6B, the inner surface 36 of the opposing wall 35 passes through the center in the width direction of the sound outlet 50 and is cut by a plane perpendicular to the speaker fixing wall 31. When viewed (meaning when viewed in a cross section cut in a plane perpendicular to the surface direction of the speaker fixing wall 31; the same applies to the following description), it has a parabolic shape.

  Further, in this embodiment, the outer surface side of the opposing wall 35 also has a similar parabolic shape on the inner surface 36. That is, as shown in FIG. 1 and FIG. 6B, the opposing wall 35 has a low height of protrusion from the speaker fixing wall 31 on the front side of the vehicle and a height of protrusion on the speaker fixing wall 31 toward the rear of the vehicle. It is formed to become higher gradually.

  The speaker device 10 having the above structure is, as shown in FIG. 1, attached to the mounting hole 5 provided in the mounting panel 1 which is a ceiling wall of the vehicle or a wall portion such as a map lamp installed on the ceiling wall. The speaker body 20 is attached so as to be inserted from the outside, and is fixed to the mounting panel 1 by a screw inserted into a screw insertion hole 48 provided in the mounting portion 47 of the peripheral wall 40. The sound outlet 50 of the speaker box 30 is disposed to face the rear of the vehicle, that is, toward the driver's seat.

  At this time, in the speaker device 10 according to this embodiment, as shown in FIG. 1, the speaker passes through the center in the width direction of the sound outlet 50 and is cut by a plane perpendicular to the speaker fixing wall 31. The sound outlet 50 of the speaker box 30 is disposed in a direction substantially orthogonal to (generally perpendicular to) the sound generation surface 22 of the main body 20. However, the sound outlet 50 of the speaker box 30 may be further inclined at a predetermined angle with respect to the direction orthogonal to the sound generation surface 22 of the speaker body 20 (here, the vertical direction). The arrangement angle with respect to the generation surface 22 is not particularly limited. That is, the sound generation surface 22 is disposed along the surface direction of the mounting panel 1, and the speaker main body 20 is disposed horizontally along the surface direction of the mounting panel 1. The sound outlets 50 of 30 are vertically oriented, orthogonal to the surface direction of the mounting panel 1. Thus, in the speaker device 10 of this embodiment, as described above, the sound outlet 50 of the speaker box 30 can be disposed at a right angle or an angle close to the right with respect to the sound generation surface 22 of the speaker main body 20 Therefore, the speaker device 10 can be miniaturized and thinned, and space saving can be achieved.

  Further, the speaker device 10 of this embodiment is mainly an on-vehicle speaker device attached to the mounting panel 1 of the vehicle, and is used in the above-described eCall system. However, the speaker acoustic characteristic maintenance device (hereinafter, referred to as “speaker device”) can be applied not only to the eCall system but also to services similar thereto. Further, the speaker device is not limited to an on-vehicle speaker, and may be used as a speaker device for sound or as a speaker device incorporated in a mobile phone or a smartphone, for example. It is not limited. Furthermore, the attachment position of the speaker device may be attached to, for example, the side wall of the door, the side wall of the luggage compartment, or the like other than the mounted panel 1 provided on the ceiling wall of the vehicle.

  Next, the function and effect of the speaker device 10 having the above structure will be described.

  As described above, the speaker device 10 according to this embodiment includes the speaker body 20 in the mounting hole 5 provided in the mounting panel 1 including the ceiling wall of the vehicle or the wall portion of the map lamp or the like installed on the ceiling wall. Is attached from the outside and fixed to the mounting panel 1 by a screw inserted into a screw insertion hole 48 provided in the mounting portion 47 of the peripheral wall 40. Then, the speaker box 30 is attached to the mounted panel 1 so as to protrude from the mounted panel 1 so that the sound outlet 50 faces the driver. Therefore, the speaker device 10 can be attached to the mounting panel 1 in a compact shape without largely projecting to the vehicle compartment side.

  And as this speaker apparatus 10 is shown in FIG. 1, the sound outlet 50 encloses the circumference | surroundings of the sound generation | occurrence | production surface 22 of the speaker main body 20, the one direction side of the surrounding wall 40 of the speaker box 30 (here vehicle rear side) Since the speaker box 30 is provided at a predetermined position, the speaker box 30 can be thinned. In addition, since the sound outlet 50 is disposed adjacent to the outer periphery of the sound generation surface 22 of the speaker body 20, the outer diameter of the speaker box 30 in the direction along the speaker fixed wall 31 can be reduced. The device 10 can be made compact as a whole. Therefore, the speaker device 10 can be attached even in a narrow place where there is not enough space in the installation space such as a map lamp provided on the ceiling wall of the vehicle, and preferably used for the eCall system described above and similar services. Can.

  Further, as shown in FIG. 5 and FIG. 6A, the peripheral wall 40 of the speaker box 30 is a first curved portion 41 formed along the outer periphery of the speaker main body when viewed from the direction perpendicular to the speaker fixed wall 31. And second curved portions 43 and 43 formed to extend from both sides of the first curved portion 41 toward the sound outlet 50. Therefore, as indicated by a line segment E indicating the spread and reflection of the sound in FIG. 6A, the sound wave reflected on the inner surface of the peripheral wall 40 of the speaker box 30 travels to spread toward the sound outlet 50, It is possible to control the deterioration of the speaker characteristics while having a compact shape. That is, the entire speaker can be made compact while maintaining the acoustic characteristics of the speaker.

  Further, in this embodiment, as shown in FIGS. 4 and 6B, the inner surface 36 of the opposing wall 35 is shaped such that the distance to the speaker fixing wall 31 gradually increases toward the sound outlet 50. Therefore, as shown by line segment E indicating the spread and reflection of the sound wave in FIG. 6B, the sound wave reflected by the inner surface 36 of the opposing wall 35 is efficiently conducted toward the sound outlet 50 without impairing the speaker characteristics. It can be made to be.

  Further, in this embodiment, as shown in FIG. 4 and FIG. 6B, the inner surface 36 of the opposing wall 35 passes through the center in the width direction of the sound outlet 50 and is cut by a plane perpendicular to the speaker fixing wall 31 When it sees in, it is made into the shape which makes a parabola. Therefore, the peripheral wall 40 of the speaker box 30 rises sharply from the back side (here, the front side of the vehicle), so exhaust (air vibration) can be suppressed and sound waves can be effectively guided to the sound outlet 50 .

  Furthermore, in this embodiment, as shown in FIG. 2, FIG. 3 and FIG. 5, a support wall 45 connecting the speaker fixed wall 31 and the opposite wall 35 is formed at the center in the width direction of the sound outlet 50. There is. Thus, the high frequency characteristics can be mainly tuned by the support wall 45. The support wall 45 also contributes to the rigidity of the speaker box 30.

  FIG. 7 shows another embodiment of the speaker acoustic characteristic maintenance device according to the present invention. It is to be noted that substantially the same parts as those of the embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  That is, unlike the speaker device 10 of the embodiment, the speaker acoustic characteristic maintenance device 10A (hereinafter, also referred to as "speaker device 10A") shown in FIG. And the opposing wall 35 are not provided. Also in this embodiment, it is possible to obtain the same effects as those of the above embodiment.

  FIG. 8 shows still another embodiment of the speaker acoustic characteristic maintenance device according to the present invention. It is to be noted that substantially the same parts as those of the embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the speaker acoustic characteristic maintenance device 10B shown in FIG. 8 (hereinafter, also referred to as "speaker device 10B"), the shape of the speaker box 30B is different from that of the above embodiment. That is, in the speaker box 30B, the speaker fixing wall 31 and the opposing wall 35 disposed opposite to the speaker fixing wall 31 are formed to be wider than in the above embodiment (here, in the vehicle, The opening width H of the sound outlet 50B is equal to the opening width H of the sound outlet 50 of the embodiment (see FIG. 5). In comparison, it is wider. Further, the opening 33B formed in the speaker fixing wall 31 also has a long hole shape with rounded ends, and the speaker main body 20 (not shown) fixed to the peripheral edge of the opening 33B also has a horizontally long shape I am

  Also in this embodiment, it is possible to obtain the same effects as those of the above embodiment. Further, in this embodiment, since the opening width H of the sound outlet 50B is wider than the opening width H of the sound outlet 50 of the embodiment, the sound wave reflected by the inner wall of the speaker box 30B is reflected. It becomes easy, it spreads more effectively toward sound outlet 50, and the effect of not losing sound pressure is also acquired.

  The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the present invention, and such embodiments are also included in the scope of the present invention. .

1 Mounting panel 5 mounting holes 10, 10A, 10B Speaker acoustic characteristic maintenance device (speaker device)
Reference Signs List 20 speaker main body 22 sound generation surface 30, 30B speaker box 31 speaker fixed wall 33, 33B opening 35 opposite wall 36 inner surface 40 peripheral wall 41 first curved portion 43 second curved portion 45 support wall 47 mounting portion 50, 50B sound outlet

Claims (6)

A speaker body having a sound generating surface,
A speaker box surrounding the sound generating surface of the speaker body and provided with a sound outlet;
The speaker box has a speaker fixed wall having an opening in which the sound generation surface is disposed, an opposite wall arranged to face the speaker fixed wall, the speaker fixed wall, and a periphery of the opposite wall. And a surrounding wall,
The sound outlet is provided at a predetermined position of the peripheral wall,
When viewed from a direction perpendicular to the speaker fixed wall, the circumferential wall is directed to the sound outlet from both sides of the first curved portion formed along the outer periphery of the speaker body and the first curved portion. And a second curved portion formed to extend on both sides,
The speaker acoustic characteristic maintenance device, wherein the sound outlet is disposed adjacent to an outer periphery of the sound generation surface of the speaker body.   When viewed in a direction perpendicular to the speaker fixed wall, the first curved portion of the circumferential wall has an arc shape along the outer periphery of the speaker body, and the second curved portion of the circumferential wall has a parabolic shape The speaker acoustic characteristic maintenance device according to claim 1.   The speaker acoustic characteristic maintenance device according to claim 1 or 2 with which the inner surface of said countering wall is shaped so that distance with said speaker fixed wall may become large gradually toward said sound outlet.   The inner surface of the opposite wall passes through the center in the width direction of the sound outlet, and has a parabola shape when viewed in a cross section perpendicular to the speaker fixed wall. The speaker acoustic characteristic maintenance device according to any one of the above.   The speaker acoustic characteristic according to any one of claims 1 to 4, wherein one or more support walls connecting the speaker fixed wall and the opposite wall are formed at a widthwise center of the sound outlet. Maintenance device.   The speaker panel is inserted into a mounting hole of a mounting panel provided on a ceiling wall of a vehicle, and the speaker panel protrudes from the mounting panel so that the sound outlet is directed to the driver. The speaker acoustic characteristic maintenance device according to any one of claims 1 to 5, which is attached to

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