JP2009094824A - Bass reflex type speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the deterioration of the frequency characteristics of a bass reflex port even if a status closing the opening of the bass reflex port arises during the use of a bass reflex type speaker device in the bass reflex type speaker device. <P>SOLUTION: The bass reflex type speaker device has a speaker body, a speaker box fitting the speaker body and the bass reflex port formed to the speaker box. The bass reflex port has a first opening in the front direction of the speaker body and a second opening with an opening surface not placed on the same surface as the opening surface of the first opening as the opening in the direction different from the front direction of the speaker body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a so-called bass reflex type speaker device.

  In a conventional speaker system, a sealed speaker device in which the airtightness of the enclosure is increased is used in order to improve the frequency characteristics. In that case, because of the hermetic type, there is a problem that the low frequency characteristics of the speaker device deteriorate due to the influence of the elastic characteristics (vibration characteristics) of the air in the enclosure.

Therefore, in the speaker device, a technique is disclosed in which a ventilation path that communicates the inside and the outside of the enclosure is provided separately from the bass reflex port at a portion where the speaker body is installed on the baffle plate (see, for example, Patent Document 1). .) According to this technique, the ventilation path is provided on the back side of the front portion of the speaker body. Therefore, the influence of the inertial force of the air spring inside the enclosure is reduced by this air passage.
JP-A-11-155186

  In a bass reflex type speaker device, by appropriately setting the resonance frequency at the bassless port, the sound pressure emitted from the speaker body and the sound pressure due to the air vibration from the bassless port are strengthened by the Helmholtz resonance principle. Thus, it is possible to obtain good frequency characteristics, particularly low frequency characteristics.

  However, in such a bass reflex type speaker device, if the opening of the bass reflex port is blocked when sound is output from the speaker body, it is difficult to efficiently enjoy the effect of the bass reflex operation at the bass reflex port. As a result, the frequency characteristics of the speaker device may be degraded. For example, when a bass reflex type speaker device is used as a speaker device used in a house or the like, the speaker reflex port may be disposed in a state where the bass reflex port is close to or closely attached to a wall or furniture of a building. In such a case, the frequency characteristic as a bass reflex type speaker device is deteriorated.

  In addition, as shown in FIG. 1, a bass reflex type speaker device may be mounted inside a seat and a voice may be provided to a user sitting on the seat. In such a case, it is possible to efficiently provide sound to the user's ear, but when the user sits on the seat, the cushion member in the seat is deformed by the pressure. As a result, in some cases, the opening of the bass reflex port is blocked by the cushion member, and the frequency characteristics of the bass reflex type speaker device may be deteriorated.

  In the present invention, in view of the above-described problems, an object of the present invention is to avoid the deterioration of the frequency characteristics of a bass reflex type speaker device even when the opening of the bass reflex port is blocked during use. To do.

In the present invention, in order to solve the above-described problems, two openings having different opening directions in the bass reflex port are provided. By doing so, it is possible to avoid as much as possible that the opening of the bass reflex port is completely blocked when the bass reflex speaker is used. As a result, the frequency characteristics can be maintained in a good state by the bass reflex operation at the bass reflex port.

  Specifically, the present invention is a bass reflex type speaker device comprising a speaker body, a speaker box in which the speaker body is installed, and a bass reflex port provided in the speaker box, wherein the bass reflex port is the speaker. It has the 1st opening part opened to predetermined one direction of a main body, and the 2nd opening part opened to the direction different from the predetermined one direction of the said speaker main body, It is characterized by the above-mentioned.

  In the conventional bass reflex type speaker device, since the opening direction of the opening portion of the bass reflex port is determined in order to increase the sound pressure from the speaker body, the opening direction of the bass reflex port is usually the direction in which the user is located. Here, the bass reflex type speaker device according to the present invention has an opening portion in addition to the first opening portion that opens in the predetermined direction (for example, the direction in which the user is located) suitable for providing voice to the user. The characteristic point is that it includes a second opening that opens in a direction different from the opening direction of the first opening. In addition, the opening direction of these openings means the sound axis direction of the sound output from the speaker and emitted through the openings.

  In the bass reflex type speaker device according to the present invention configured as described above, the opening of the bass reflex port is formed by the first opening and the second opening having different opening directions. Even in such a state that the valve is blocked, it is possible to release the air vibration in the bass reflex port to the outside of the bass reflex type speaker device through the second opening. Therefore, even in such a case, it is possible to avoid as much as possible the deterioration of the frequency characteristics of the bass reflex type speaker device. Moreover, since the 2nd opening part comprises the opening part of a bass-reflex port with the 1st opening part, it is possible to provide the acoustic effect by bass-reflex operation to the user of a speaker apparatus.

  Here, in the bass reflex type speaker device, the opening area of the first opening may be different from the opening area of the second opening. Accordingly, it is possible to provide a bass reflex type speaker device in consideration of the correlation between the opening direction of each opening and the acoustic effect. Further, the opening area of the second opening may be larger than the opening area of the first opening. Since the opening of the first opening is open in a predetermined direction of the speaker body, the acoustic effect due to the bass reflex operation at the bass reflex port can be more effectively exhibited. Therefore, in order to maintain the characteristics of the original bass reflex port, the opening area of the second opening is made larger than the area of the first opening, so that the second opening with respect to the bass reflex operation through the first opening. It is possible to make the part difficult to influence. Of course, even in such a case, if the first opening is closed, it is possible to obtain the acoustic effect by the bass reflex operation through the second opening.

  In the bass reflex type speaker device described above, the opening direction of the second opening may be different from the opening direction of the first opening, and is not limited to a specific direction. About the aspect of a 1st opening part and a 2nd opening part, the aspect shown below can be illustrated. In the first aspect, in the bass reflex type speaker device, the front portion of the speaker box corresponding to a predetermined direction of the speaker main body is positioned on the same plane as the first front portion and the first front portion. The bass reflex port is provided at the boundary between the first front part and the second front part, and the first opening opens in the front direction of the speaker body, and The second opening may be opened in the extending direction of a step formed by the first front portion and the second front portion.

At this time, in the front part of the speaker box, the first front part and the second front part are not provided on the same surface, so that a step part is formed, and this step part is the first front part or the second front part. Among these, it extends on the front part close to the inner direction of the speaker box, in other words, on the front part arranged at a recessed position. With such a configuration, it is possible to adopt two different directions, that is, a predetermined direction of the speaker body with respect to the opening of the bass reflex port and a direction in which the stepped portion extends. Therefore, in consideration of the acoustic effect of the bass reflex operation described above, the opening direction of the first opening is a predetermined direction of the speaker body, and the opening direction of the second opening is the extending direction of the stepped portion. The present invention can solve the above problems.

  According to a second aspect, in the bass reflex type speaker device, the front portion of the speaker box corresponding to a predetermined direction of the speaker body has the opening except for a part of the opening edge of the first opening. When the speaker body has a protrusion that protrudes in one predetermined direction while surrounding the edge, the second opening opens in the direction of a part of the opening edge that is not surrounded by the protrusion. It may be a thing.

  At this time, in the front portion of the speaker box, the protrusion is provided so as to surround the opening edge of the first opening, and the protrusion is partially cut away. Therefore, with such a configuration, it is possible to adopt two different directions, that is, a predetermined direction of the speaker body with respect to the opening of the bass reflex port and a direction in which the protrusion is cut away. Therefore, in consideration of the acoustic effect of the bass reflex operation described above, the opening direction of the first opening portion is set as a predetermined direction of the speaker body, and the opening direction of the second opening portion is set as a direction in which the protruding portion is cut out. Thus, the present invention can solve the above problems.

  In the third aspect, in the bass reflex type speaker device, in the case where the speaker box has a shape formed by combining a plurality of surface portions, the bass reflex port is a predetermined portion of the speaker body among the surface portions. The first opening portion opens to the one surface portion side, and the first opening portion is open to the one surface portion side, and the first surface portion corresponding to one direction and the other surface portion are coupled to each other. The two openings may be opened to the other surface portion side.

  That is, since the speaker box has a shape in which a plurality of surface portions are combined, the portion where the surface portions are combined is a ridge line portion formed by the intersection of the surfaces. Thus, by forming the ridge line portion into a cut-out shape, it is possible to easily form at least two openings having different opening directions. Therefore, in the bass reflex type speaker device, among the openings formed by cutting out the ridge portion, the opening of the surface portion corresponding to one predetermined direction of the speaker body is set as the first opening, and the other The opening is set as the second opening. Thus, the present invention can solve the above problems. In addition, “the shape in which a plurality of surface portions are combined” is not only the shape formed by combining the individual surface portions, but also the ridge line portion on the surface when the speaker box is viewed integrally. A plurality of surface portions are defined by the above, and the defined surface portions are joined to each other so as to form a speaker box as a unit.

  Here, the bass reflex type speaker device described above is a speaker device mounted inside a seat, and the predetermined one direction of the speaker body may be a direction facing a user sitting on the seat. That is, when a user sits on the seat, a member such as a cushioning material constituting the seat is deformed inside the seat, so that depending on the load applied to the seat from the user, a bass reflex speaker device provided inside the seat, In particular, it may interfere with the bass reflex port. However, even in such a case, in the bass reflex type speaker device according to the present invention, the bass reflex port has the first opening and the second opening, so that the frequency characteristic is maintained in a good state as much as possible. It becomes possible to do.

In the bass reflex type speaker device described above, the speaker box may be integrally formed of a resin material. The speaker box can be easily manufactured by integral molding.

  In the bass reflex type speaker device, it is possible to avoid the deterioration of the frequency characteristics even when the opening of the bass reflex port is blocked during use.

  Here, as an embodiment of a bass reflex type speaker device according to the present invention, a speaker device mounted inside a vehicle seat will be described with reference to the drawings.

  FIG. 2A is a cross-sectional view showing a schematic configuration of the speaker device 1 which is a bass reflex type speaker device according to the present invention. FIG. 2B shows that the speaker device 1 is mounted inside and provides audio to the user 20. 1 is a cross-sectional view showing a schematic configuration of a possible seat 10. FIG. 2B shows a state where the user 20 is sitting on the seat 10.

  First, the configuration of the speaker device 1 itself will be described with reference to FIG. 2A. The speaker device 1 is a so-called bass reflex type speaker device, and has a speaker box 2 as an enclosure. And the opening part 4 opened to the front side of this speaker box 2 is provided in the top part of this speaker box 2, and the speaker main body 3 is stored in the said opening part 4. FIG. The sound axis direction of the output sound from the speaker body 3, that is, the front direction of the speaker body 3 is the front direction of the speaker box 2. In FIGS. 2A and 2B, descriptions of a reproduction control device that supplies an audio signal to the speaker body 3 and signal lines are omitted.

  Here, since the speaker device 1 according to the present invention is a bass reflex speaker device as described above, the bass reflex port 7 is provided on the front surface (front portion) of the speaker box 2. The bass reflex port 7 has a cylindrical shape, and communicates the inner space of the speaker box 2 with the outer space located on the front side thereof. Here, the front portion of the speaker box 2 is roughly divided into a first front portion 5 and a second front portion 6.

  Here, as shown in FIG. 2A, the first front part 5 is arranged at a position protruding to the front side of the speaker box 2 compared to the second front part 6. Accordingly, a stepped portion SP corresponding to the displacement of the surface as the front portion is formed between the first front portion 5 and the second front portion 6, and the stepped portion SP is an inner space of the speaker box 2. It extends along the second front part 6 arranged at a deeper position on the side. Further, the bass reflex port 7 is formed at the boundary between the first front part 5 and the second front part 6. Accordingly, the end portion of the first front portion 5 is connected to one end side of the bass reflex port 7, and the end portion of the second front portion 6 is connected to the other end side of the bass reflex port 7.

  The bass reflex port 7 of the speaker device 1 configured as described above has the first opening 8 and the second opening 9 having different opening directions due to the presence of the stepped portion SP. In addition, both opening parts have the relative relationship which is not located on the same plane. In other words, the first opening 8 that opens in the direction that coincides with the cylindrical axial direction of the bass reflex port 7 (the direction indicated by the black arrow in FIG. 2A) and the direction in which the stepped portion SP extends, in other words, Two different opening portions of the second opening portion 9 opening in the direction along the second surface portion 6 (the direction indicated by the white arrow in FIG. 2A), the bass reflex port 7 is an opening connected to the outer space. Will have in the site. Therefore, the air vibration due to the bass reflex operation at the bass reflex port 7 propagates mainly in the opening direction of the first opening 8 that coincides with the axial direction of the bass reflex port 7, but in addition to the opening direction of the first opening 8. Propagation is also possible in the opening direction of the two openings 9.

2B is a schematic configuration of the seat 10 in which the speaker device 1 shown in FIG. 2A is incorporated.
The user 20 is putting weight on the seat 10. The seat 10 is mainly composed of a rear cushion member 11, a front cushion member 12, and a gap portion 13 provided between both cushion members. The speaker device 1 is sandwiched between the front cushion member 12 and the rear cushion member 11 so as to be accommodated in the gap portion 13. In the seat 10 configured as described above, it is possible to efficiently provide sound from the speaker 3 to the ear of the user 20, and thus various acoustic effects can be efficiently provided to the user 20.

  Here, in FIG. 2B, since the user 20 puts its weight on the front cushion member 12 of the seat 10, a part of the front cushion member 12 is deformed and is in contact with the front portion of the speaker box 2. Of course, the speaker box 2 has sufficient strength so as not to be deformed or damaged by the contact of the cushion member. Further, since the first front part 5 is provided at a position protruding to the front side of the speaker box 2 relative to the second front part 6, the first front part 5 is easily contacted with the front cushion member 12 as shown in FIG. 2B. One front portion 5.

  Then, when the user 20 puts weight on the front cushion member 12, the first opening 8, which is an opening that coincides with the axial direction of the bass reflex port 7, of the two openings of the bass reflex port 7 is consequently obtained. Will be blocked. However, in the speaker device 1 according to the present embodiment, the second opening 9 that is opened in a different direction from the first opening 8 and is not located on the same plane as the first opening 8 is provided. As shown in FIG. 2B, the opening state of the second opening 9 is maintained even if the first opening 8 is blocked. As a result, it is possible to transmit the air vibration caused by the bass reflex operation at the bass reflex port 7 to the outside of the speaker device 1. Even when the user 20 is sitting on the seat 10, the frequency of the speaker device 1 which is a bass reflex type speaker device can be transmitted. The characteristics can be kept as good as possible.

  Moreover, although the said Example demonstrated the speaker apparatus 1 provided in the seat 10, the speaker apparatus 1 which concerns on this invention is not restricted to such a usage pattern. For example, the speaker device 1 is useful also as a speaker device for home audio used in a mode in which the speaker device itself is arranged indoors. When used for home audio, there is a possibility that an object such as a wall or furniture may be placed immediately before the first opening 8 of the bass reflex port 7. However, even in such a case, the presence of the second opening 9 can maintain the frequency characteristics of the speaker device 1 that is a bass reflex type speaker device in the best possible state as described above. it can.

  A second embodiment of the speaker device 1 according to the present invention will be described with reference to FIG. FIG. 3 is a schematic configuration diagram when the speaker device 1 is viewed from the front side. The speaker box 2 of the speaker device 1 is made of resin and is integrally formed by injection molding. As in the case of the first embodiment, the speaker device 1 is also a speaker device that is used in a state of being housed in a seat.

The resin speaker box 2 has a shape in which a plurality of surface portions are joined together by being integrally formed. In addition, the surface part said here is a surface part which forms the speaker box 2, The surface shape may be either a plane or a curved surface. Here, in FIG. 3, among the plurality of surface portions, the first surface portion 2 a whose normal direction is the front direction of the speaker main body 3 and the first surface portion 2 a are connected to each other. A second surface portion 2b is shown. The second surface portion 2b extends in a direction perpendicular to the first surface portion 2a, extends in the direction of the inner space of the speaker box 2, and is bent by about 45 degrees so as to draw an arc. It is a curved surface. Accordingly, the first surface portion 2a and the second surface portion 2b are joined together by the ridge line portion 2c. In other words, the ridge line portion 2c forms a part of each of the first surface portion 2a and the second surface portion 2b. To do.

  Here, a notch part is formed so that the ridgeline part 2c may be straddled. Specifically, when the speaker box 2 is integrally formed, a part of the mold corresponding to the notch is disposed at the position where the notch is formed, so that the notch can be easily formed. is there. This notch serves as an opening of the bass reflex port 7, and as shown in FIG. 3, the notch straddles the ridgeline part 2c, so that each of the first surface part 2a and the second surface part 2b , Openings that are continuous with each other but not on the same plane will be created. Here, since the front direction of the first surface portion 2a is the front direction of the speaker body 3, the opening formed on the first surface portion 2a side is used as the first opening portion 8 and the second surface portion. The opening formed on the 2b side is used as the second opening 9.

  In FIG. 3, the opening direction of the first opening 8 is indicated by a black arrow, and the opening direction of the second opening 9 is indicated by a white arrow. As shown in FIG. 2B, when the speaker device 1 shown in FIG. 3 is housed in a seat and used, the cushion member is formed on the front side of the speaker device 1 when the user sits on the seat. There is a possibility of blocking. However, the bass reflex port 7 of the speaker device 1 according to the present embodiment has a second opening 9 that opens in a direction different from the first opening 8 and is not located on the same plane as the first opening 8. Therefore, as in the case of the first embodiment, the frequency characteristics of the speaker device 1 that is a bass reflex type speaker device can be maintained as good as possible.

  A third embodiment of the speaker device 1 according to the present invention will be described with reference to FIG. 4A is a cross-sectional view showing a schematic configuration of the speaker device 1, as in FIG. 2A, and FIG. 4B is a view when a protrusion 15 described later is viewed from the front side. The speaker device 1 is also a speaker device that is used in a seat. Further, in the speaker device 1 according to the present embodiment, the front portion of the speaker box 2 is not formed with a stepped portion as shown in FIG. The bass reflex port 7 is provided in the front portion of the speaker box 2.

  Here, the projecting portion 15 is formed so as to surround the opening edge 16 formed in the front portion of the speaker box 2 which is the opening portion of the bass reflex port 7. The protruding portion 15 protrudes from the front portion of the speaker box 2 in the front direction. The protruding portion 15 does not surround the entire periphery of the opening edge but is partly cut out, that is, a horseshoe shape. As shown in FIGS. 4A and 4B, in the speaker device 1 according to this embodiment, the opening of the protrusion 15 is in the lower direction of the speaker device 1.

  In the speaker device 1 configured as described above, the opening of the bass reflex port 7 has a shape that is one step higher than the front portion of the speaker box 2 as shown in FIG. It is missing. As a result, the bass reflex port 7 opens in the front direction of the speaker box 2 (in the direction of the black arrow in the figure) and in the notch direction of the protrusion 15 (in the direction of the white arrow in the figure). And two openings having different opening directions.

Therefore, the former is used as the first opening 8 and the latter is used as the second opening 9. In this way, when the speaker device 1 is housed in the seat and used as shown in FIG. 4, the cushion member is formed on the front side of the speaker device 1 by the user sitting on the seat. Although the opening 8 may be blocked, the bass reflex port 7 of the speaker device 1 according to the present embodiment opens in a direction different from that of the first opening 8 and is on the same plane as the first opening 8. Since the second opening 9 is not positioned, the frequency characteristics of the speaker device 1 which is a bass reflex type speaker device is maintained as good as possible, as in the first and second embodiments. Can do.
[Other Examples]

  In the embodiments described above, it is preferable that the opening surface seat of the second opening 9 is larger than the opening area of the first opening 8. By doing in this way, it becomes possible to suppress that the bass reflex operation in the bass reflex port 7 that should be originally transmitted to the user through the first opening 8 is inhibited by the second opening 9.

It is a 1st figure which shows schematic structure of the conventional bass-reflex type speaker apparatus. It is a 2nd figure which shows schematic structure of the conventional bass-reflex type speaker apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is a 1st figure which shows schematic structure of the bass-reflex type speaker apparatus based on the 1st Example of this invention. It is a 2nd figure which shows schematic structure of the bass-reflex type speaker apparatus which concerns on the 1st Example of this invention. It is a figure which shows schematic structure of the bass-reflex type speaker apparatus which concerns on the 2nd Example of this invention. It is a figure which shows schematic structure of the bass-reflex type speaker apparatus which concerns on the 3rd Example of this invention.

Explanation of symbols

1 .... Speaker device (bass reflex speaker device)
2 .... Speaker box 3 .... Speaker main body 5 .... First front part 6 .... Second front part 7 .... Bass reflex port 8 .... First opening part 9. ... Second opening 10 ... Seat 15 ... Projection 16 ... Opening edge 20 ... User

Claims (7)

A speaker body;
A speaker box in which the speaker body is installed;
A bass reflex speaker device comprising a bass reflex port provided in the speaker box,
The bass reflex port is
A first opening that opens in a predetermined direction of the speaker body;
A second opening that opens in a direction different from the predetermined direction of the speaker body;
A bass-reflex type speaker device comprising:   The bass reflex speaker device according to claim 1, wherein an opening area of the first opening is different from an opening area of the second opening. The front portion of the speaker box corresponding to a predetermined direction of the speaker body has a first front portion and a second front portion not located on the same plane as the first front portion,
The bass reflex port is provided at the boundary between the first front portion and the second front portion, the first opening portion opens in the front direction of the speaker body, and the second opening portion is the first opening portion. The bass-reflex speaker device according to claim 1 or 2, wherein an opening is made in an extending direction of a step portion formed by the front portion and the second front portion. The front portion of the speaker box corresponding to a predetermined direction of the speaker body surrounds the opening edge except for a part of the opening edge of the first opening portion. Has a protruding portion protruding to
The bass reflex speaker device according to claim 1 or 2, wherein the second opening portion opens in a direction of a part of the opening edge not surrounded by the protrusion. The speaker box has a shape formed by combining a plurality of surface portions,
The bass reflex port is provided so as to cut out a ridge line portion where one surface portion corresponding to a predetermined direction of the speaker body and the other surface portion of the surface portions are coupled to each other. The bass reflex type speaker device according to claim 1 or 2, wherein the opening portion opens to the one surface portion side, and the second opening portion opens to the other surface portion side. The bass reflex type speaker device is a speaker device mounted inside a seat,
The bass reflex type speaker device according to any one of claims 1 to 5, wherein the predetermined one direction of the speaker body is a direction facing a user sitting on the seat.   The bass-reflex speaker device according to any one of claims 1 to 6, wherein the speaker box is integrally formed of a resin material.

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