JP2008263361A - Speaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker unit which is made compact by forming a duct at the back face side of a speaker, and supporting the back face of the speaker by a member configuring the duct. <P>SOLUTION: The speaker unit 1 is provided with a casing where an opening 13 is formed at a front part 11 and a communicative hole 22 is formed at a back face part 21; a speaker 500 arranged in the casing in a state that a sound output face 510 is exposed from the opening 13; and ribs 25a and 25b as support members formed in the neighborhood of the communicative hole 22 on the inside face 24 of the casing for supporting the sound output face 510 and a back face 530 at the opposite side in the speaker 500. Then, the ribs 25a and 25b are provided with a communicative hole 23a whose one end is connected to the communicative hole 22, and which is configured of a continuous space connecting the inside of the casing to the outside of the casing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker unit.

  Conventionally, it is known that in a speaker box that houses a speaker, the same sound pressure as that generated from the sound output surface of the speaker is generated inside the housing. When the speaker box is sealed, the sound pressure may interfere with the movement of the diaphragm that forms the sound output surface of the speaker. In addition, the energy applied to the housing constituting the speaker box also increases, which may cause a so-called box ringing phenomenon. That is, the sound emitted from the speaker may become unclear or good frequency characteristics may not be obtained.

On the other hand, a speaker device that reduces sound pressure by forming a duct that communicates from the inside of the housing to the outside has been proposed (see, for example, Patent Document 1).
JP 2000-069582 A

  However, in the speaker device of Patent Document 1, since the duct is formed to extend in the thickness direction on the same side as the sound output surface of the speaker, the speaker device may be increased in size.

  It is an object of the present invention to provide a speaker unit that is miniaturized by forming a duct on the back side of the speaker and supporting the back side of the speaker by a member constituting the duct.

The present invention includes a housing in which an opening is formed in a front portion and a communication hole is formed in a back portion, a speaker disposed in the housing with an audio output surface exposed from the opening, and the housing A support member that is formed in the vicinity of the communication hole on the inner surface of the body and that supports the back surface of the speaker opposite to the sound output surface, and the support member has one end continuous with the communication hole and the support member. The present invention relates to a speaker unit having a communication path constituted by a continuous space connecting the inside of a housing and the outside of the housing.

  Moreover, it is preferable that the said communication hole is formed in the position facing the back surface of the said speaker.

  Moreover, it is preferable that the said communicating path is formed so that it may extend on the plane parallel to the said front part or the said back part of the said housing | casing.

  The communication path is preferably formed in a spiral shape on the plane.

  The casing is formed by combining a first case member having the front portion and a second case member having the back portion, and the support member includes the first case member and the second case. It is preferable that the speaker is brought into contact with the back surface of the speaker by being coupled to the member.

  ADVANTAGE OF THE INVENTION According to this invention, the speaker unit reduced in size can be provided by forming a duct in the back side of a speaker and supporting the back surface of a speaker by the member which comprises a duct.

The best mode for carrying out the present invention will be described below with reference to the drawings.
The speaker unit 1 of the present embodiment will be described with reference to FIGS. FIG. 1 is a perspective front view of the speaker unit 1. FIG. 2 is a perspective rear view of the speaker unit 1.
FIG. 3 shows an XX cross-sectional view of the speaker unit 1. FIG. 4 is a diagram for explaining the structure of the duct in the speaker unit 1.

  As shown in FIGS. 1 and 2, the speaker unit 1 includes a first case 10 having a front portion 11 and a second case 20 having a back portion 21. The first case 10 and the second case 20 are members in which one surface of a thin rectangular parallelepiped is opened, and are combined so that their openings face each other, thereby forming the outer shape of the speaker unit 1.

  As shown in FIG. 1, a speaker opening 13 is formed in the front portion 11 of the first case 10. The sound output surface 510 of the speaker 500 is exposed from the speaker opening 13. That is, the speaker 500 is housed and disposed inside the housing of the speaker unit 1 so that the sound output surface 510 is exposed from the speaker opening 13.

  As shown in FIG. 2, a communication hole 22 is formed in the back surface portion 21 of the second case 20. As shown in FIG. 3, the communication hole 22 is formed at a position facing the back surface 530 of the speaker 500.

  As shown in FIG. 3, the speaker 500 has a main body 520 and a sound output surface 510. The main body 520 has a magnet part (not shown) and a voice coil part. The sound output surface 510 is made of a cone-shaped diaphragm. The sound output surface 510 is exposed to the external space 910 from the speaker opening 13 formed in the first case 10. In other words, the speaker 500 is housed and arranged inside the speaker unit 1 with the sound output surface 510 exposed to the external space 910 through the speaker opening 13.

  The back surface 530 of the speaker 500 is supported by ribs 25a and 25b constituting a support member. Specifically, the back surface 530 of the speaker 500 is supported by the support portion 30 configured by the end surfaces of the ribs 25a and 25b. As described above, the communication hole 22 is formed at a position facing the back surface 530 of the speaker 500 in the second case 20.

  The support portion 30 that contacts and supports the back surface 530 of the speaker 500 is configured by the end surfaces of the ribs 25a and 25b. Specifically, the support part 30 is formed so that the end surfaces opposite to the second case 20 side of the ribs 25a and 25b are positioned on the same plane. That is, the heights and end surfaces of the ribs 25a and 25b are formed so as to be in contact with the flat back surface 530 evenly.

  As shown in FIGS. 3 and 4, the ribs 25 a and 25 b are formed so as to rise vertically from the inner surface 24 of the second case 20 to the inner surface 24. The ribs 25 a and the ribs 25 b are each formed in a circular shape (C shape) with a part opened on the inner surface 24, and are formed parallel to each other in the planar direction of the inner surface 24. The ribs 25a and 25b constitute a support member and a duct 23 described later.

  As shown in FIGS. 3 and 4, a duct 23 is formed along the inner surface 24 of the back surface portion 21 of the second case 20. The duct 23 includes ribs 25 a and 25 b and a back surface 530 of the speaker 500. Specifically, the duct 23 having a space surrounded by the inner surface 24, the rib 25a, the rib 25, and the rear surface 530 is formed by arranging the rear surface 530 of the speaker 500 in contact with the end surfaces of the ribs 25a, 25b. Is done.

  Inside the duct 23, a communication path 23 a that is a continuous space connecting the internal space 900 and the external space 910 of the speaker unit 1 is formed. As shown in FIG. 4, the communication path 23 a is spirally extended on the inner surface 24 that is a plane parallel to the front portion 11 of the first case 10 and the rear portion 21 of the second case 20. The communication passage 23a is formed so as to connect the communication opening 22a on the inner space 900 side in the duct 23 and the communication hole 22 on the outer space side.

  The communication hole 23 a is formed so as to extend not in the thickness direction of the speaker unit 1 but in the plane direction of the inner surface 24. And the length of the communication path 23a is the phase of the sound wave from the rear surface in order to amplify and emphasize a desired frequency in the sound output from the speaker unit 1, as in the conventional phase inversion type (bass reflex) speaker. Inverted or radiated in phase with the sound wave from the front, that is, the length from which the sound from the back side of the speaker is output with a half wavelength away from the sound from the front side of the speaker Is preferably set. Therefore, the length of the communication path 23a is changed according to the frequency to be emphasized (for example, the frequency in the low frequency range). Further, the duct 23 may be provided with a variable mechanism capable of changing the length of the communication path 23a so that the emphasized frequency can be changed. In addition, the length of the communication path 23a is not only set to emphasize a specific frequency, but also attenuates an arbitrary frequency in the sound output from the speaker unit 1 according to the frequency characteristics of the speaker 500. You may make it set as follows. Furthermore, the length of the communication path 23a may be set to a length that cancels the resonance frequency of the speaker 500.

A procedure for assembling the speaker unit 1 will be described.
First, as shown in FIG. 3, the speaker 500 is arranged in the first case 10 so that the sound output surface 510 is exposed to the external space 910 through the speaker opening 13. Then, the second case 20 shown in FIG. As this coupling structure, a conventional coupling structure such as screw coupling, adhesive coupling or welding may be used. It should be noted that a sealing member such as a rubber member may be interposed between the coupling surfaces of the first case 10 and the second case 20 for coupling.

  By coupling the first case 10 and the second case 20 in this manner, the back surface 530 of the speaker 500 is supported by the ribs 25a and 25b as shown in FIG. That is, the speaker 500 is supported by the support portion 30 on the back surface 530 by coupling the first case 10 and the second case 20 together.

  According to this embodiment, since the duct 23 having the communication path 23 a is formed in the speaker unit 1, it is possible to prevent the box noise and the sound from becoming unclear due to the internal pressure being applied.

  Further, according to the present embodiment, the duct 23 is formed on the back surface 530 side of the speaker 500, and the back surface 530 of the speaker 500 is supported by the ribs 25a and 25b constituting the duct 23, so that the size is reduced. A speaker box can be provided. In particular, the speaker unit 1 can be reduced in size so that the area of the front part 11 and the rear part 21 is reduced. For example, the speaker unit 1 can be reduced in size in the height direction in FIG.

  Moreover, according to this embodiment, since it comprised so that the back surface 530 of the speaker 500 might be supported by the ribs 25a and 25b which comprise the duct 23, a number of parts can be reduced and cost can be reduced. Further, since the speaker 500 can be fixed by joining the first case 10 and the second case 20, a step of fixing the speaker 500 with screws or an adhesive is unnecessary. Thereby, assembly work can be reduced.

  Further, according to the present embodiment, the duct 23 is formed integrally with the second case 20, so that the ribs 25 a and 25 b constituting the duct 23 can be simultaneously molded in the process of molding the second case 20. . Further, the length and the cross-sectional area of the communication passage 23 a in the duct 23 can be easily changed by adjusting a mold for molding the second case 20. Further, since the ribs 25a and 25b are formed so as to extend straight and perpendicular to the inner surface 24 of the second case 20, there is no obstructive shape called undercut and can be suitably molded.

  In addition, according to the present embodiment, the communication path 23a is formed in a spiral shape in the plane direction on the inner surface 24 of the second case 20, so that the speaker unit 1 is enlarged even if the length of the communication path 23a is increased. Not done.

  As mentioned above, although preferred embodiment of this form was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above. For example, in the present embodiment, an independent speaker unit is described as the speaker unit 1, but the present invention is not limited to this, and the speaker unit 1 may be stored in a cradle or the like.

  Moreover, in this embodiment, although the communicating path 23a is formed in the spiral shape, it is not limited to this, The shape will not be limited if it is formed so that it may extend in the planar direction in the inner surface 24 of the 2nd case 20. .

  In the present embodiment, the duct 23 having the communication path 23a is formed on the second case 20 side, but is not limited thereto, and is formed on the first case 10 side where the sound output surface 510 of the speaker 500 is disposed. May be. In this case, the thickness of the speaker unit 1 can be reduced.

The perspective front view of the speaker unit 1 is shown. The perspective rear view of the speaker unit 1 is shown. An XX sectional view of speaker unit 1 is shown. The figure explaining the structure of the duct in the speaker unit 1 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker unit 10 1st speaker 11 Front part 20 2nd speaker 21 Back part 22 Communication hole 23 Duct 23a Communication path 24 Inner surface 25a Rib 25b Rib 30 Support part 500 Speaker 510 Sound output surface 530 Back surface

Claims (5)

A housing in which an opening is formed in the front portion and a communication hole is formed in the back portion;
A speaker disposed in the housing with an audio output surface exposed from the opening;
A support member that is formed in the vicinity of the communication hole on the inner side surface of the housing and supports a back surface of the speaker opposite to the sound output surface;
The support member is a speaker unit having a communication path including one end continuous to the communication hole and a continuous space connecting the inside of the housing and the outside of the housing.   The speaker unit according to claim 1, wherein the communication hole is formed at a position facing a back surface of the speaker.   The speaker unit according to claim 1, wherein the communication path is formed to extend on a plane parallel to the front portion or the back portion of the housing.   The speaker unit according to claim 3, wherein the communication path is formed in a spiral shape on the plane. The housing is
A first case member having the front portion and a second case member having the back portion are combined and formed.
5. The speaker unit according to claim 1, wherein the support member is brought into contact with a rear surface of the speaker by coupling the first case member and the second case member. 6.

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