JP2009273061A - Loudspeaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loudspeaker device which can reduce a height and can attain a high acoustic reproducibility. <P>SOLUTION: A weight 5 as an acoustic load is linked to a driver 4 to substantially increase the inertial mass of a loudspeaker unit 7 and to suppress unnecessary vibration caused by the loudspeaker unit 7 within an enclosure 13, thus increasing an acoustic reproducibility. A diaphragm 3 is held to the enclosure 13, and the enclosure 13 is mounted to a mounting member 6, the mounting member 6 is fixed to a dashboard 2 by a blanket 29 to prevent an air flow within the enclosure 13 from being hindered, a sound pressure waveform generated by the vibration of the diaphragm 3 is accurately reproduced to attain a high acoustic reproducibility, the design flexibility of the shape of the enclosure 13 is increased, the shape of the enclosure 13 is made compact, thus reducing a rising height from the dashboard 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker device that can be suitably implemented as a speaker of a vehicle acoustic device.

  Conventionally, to accurately reproduce the waveform of an acoustic signal itself, the “Time Domain” (registered trademark) has been designed to focus on suppressing unnecessary vibrations and resonances that hinder the rise of minute signals. The design method called is known. In this design method, a relative weight with respect to the diaphragm can be stabilized by providing a weight called a virtual ground at the rear of the speaker unit to increase the inertial mass of the speaker unit and suppressing vibration of the speaker unit. Since the virtual ground should ideally be stationary, it is also called a ground anchor.

  Since the shape of the speaker device for home audio equipment is not limited, for example, as disclosed in Patent Document 1, a spherical shape that is long in the front-rear direction, that is, an egg-shaped enclosure so that an ideal air flow can be obtained inside the enclosure. In this prior art, when the speaker device is installed on the vehicle dashboard as a vehicle audio device, it is necessary to secure a field of view in front of the vehicle. It is difficult to adopt a limited configuration in which the egg-shaped enclosure is fixed to the stand. In addition, when this speaker device is mounted on the dashboard, the vibrations of the vehicle body are transmitted to the enclosure via the dashboard, so the air flow in the enclosure is obstructed and sufficient acoustic reproducibility reflecting the time domain structure is improved. There is a problem that cannot be expected.

JP 2001-285974 A

  The objective of this invention is providing the speaker apparatus which can reduce height and implement | achieve high acoustic reproducibility.

  The present invention (1) accommodates a speaker unit having a drive unit that mechanically vibrates a diaphragm in response to an acoustic signal, an acoustic load coupled to the drive unit, the speaker unit, and the acoustic load. A speaker device comprising: an enclosure that holds the diaphragm; and a plate-like attachment body that is fixed to a predetermined attachment portion, to which the enclosure is attached, and to which the acoustic load is connected. is there.

  According to the present invention (1), even if an acoustic load as a virtual ground or a ground anchor is connected to the drive unit, the inertial mass of the speaker unit is substantially increased, and the diaphragm is driven by the drive unit. The speaker unit can be maintained in a static equilibrium state, the relative position of the diaphragm can be stabilized, and the sound reproducibility can be improved.

  Further, the diaphragm is held by the enclosure, and the enclosure is attached to the attachment body. Since this mounting body is fixed to a predetermined mounting portion such as a dashboard of a vehicle, for example, vibration of the predetermined mounting portion is prevented from being directly transmitted to the enclosure, and the enclosure is directly connected to the dashboard. Since it does not touch, the vibration of the dashboard is not transmitted, and the air flow in the enclosure is prevented from being obstructed by the vibration of the enclosure as in the prior art, and the sound pressure waveform generated by the vibration of the diaphragm in the enclosure Can be reproduced accurately and high sound reproducibility can be realized. As a result, the degree of freedom in designing the shape of the enclosure can be increased, the shape of the enclosure can be made smaller than in the prior art, and the height from the predetermined mounting portion can be reduced.

  According to the present invention (1), since the acoustic load is provided in the drive unit, it is possible to suppress the occurrence of unnecessary vibration in the enclosure, and to provide the mounting body to which the enclosure is mounted. Since the vibration from the predetermined mounting portion is not directly transmitted to the enclosure, the air flow in the enclosure is prevented from being obstructed by the vibration of the enclosure, A speaker device having high sound reproducibility can be realized.

  1 is a cross-sectional view showing a speaker device 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing an appearance of the speaker device 1 shown in FIG. 1, and FIG. 3 is a rear view of the speaker device 1. 4 is a front view of the speaker device 1, and FIG. 5 is a bottom view of the speaker device 1.

  A speaker device 1 according to the present embodiment is a vehicle time domain speaker device mounted on a center portion of a dashboard 2 which is a predetermined mounting portion of a vehicle, and includes a vehicle sound reproducing device and a navigation device (not shown). The sound signal given from such a sound source device can be reproduced with clear sound.

  The speaker device 1 includes a speaker unit 7 having a drive unit 4 that mechanically vibrates a diaphragm 3 called a cone in response to an acoustic signal, a weight 5 that is an acoustic load connected to the drive unit 4, and a speaker. The unit 7 and the weight 5 are accommodated, and the enclosure 13 holding the diaphragm 3 is fixed to the center portion of the dashboard 2. The enclosure 13 is mounted, and the plate-like attachment 6 to which the weight 5 is connected. And a bracket 29.

  The speaker unit 7 has a metal frame 8 to which the peripheral edge of the diaphragm 3 is fixed, and the drive unit 4 is provided on the frame 8. The drive part 4 has a shaft part 9 protruding from the surface facing the diaphragm 3, and the shaft part 9 is fitted in a fitting recess 10 in the shape of a right cylinder formed in the weight 5. They are linked together.

  By connecting the weight 5 to the drive unit 4 in this way, the inertial mass with respect to the vibration of the speaker unit 7 is increased, the vibration in the front-rear direction along the axis of the diaphragm 3 is allowed, and the vibration in the direction intersecting the axis is performed. The relative position of the diaphragm 3 with respect to the frame 8 is stabilized, and unnecessary vibration generated by vibration of the frame 8 of the speaker unit 7 and the drive unit 4 in the enclosure 13, that is, the diaphragm 3 based on an acoustic signal. It is possible to suppress the air vibration that inhibits the vibration of the sound and improve the sound reproducibility.

  The weight 5 includes a base portion 14 in which the above-described fitting recess 10 is formed, and a plurality of arm portions 15 that protrude radially from the outer peripheral surface of the base portion 14. A buffer member 16 made of foamed synthetic resin is attached to the tip of each arm portion 15.

  The enclosure 13 has a bowl-shaped outer shell 18 in which a sound emitting hole 17 is formed, and a bottom portion 20 formed integrally with the outer shell 18 and in which a fitting hole 19 into which the attachment body 6 is fitted is formed. A cylindrical central cylindrical portion 22 that communicates with the central portion of the outer shell 18 opposite to the sound emitting hole 17 and communicates with the internal space 21 of the enclosure 13 and the outside, and outer shells on both sides of the central cylindrical portion 22. 18 and a pair of screw insertion cylinder portions 23 extending substantially parallel to the central cylinder portion 22 and a pair of screw insertion cylinder portions 23 formed on the same axis on both sides of the sound emitting hole 17 of the outer shell 18. And a screw receiving tube portion 24.

  Screws 25 are respectively inserted into the screw insertion cylinders 23, and the screws 25 are screwed into the screw receiving cylinders 24. The screw insertion cylinders 23 and the screw receiving cylinders 24 are on the same axis. Each is connected.

  Each arm portion 15 of the weight 5 extends toward each screw receiving tube portion 24, and the above-described buffer member 16 is interposed between each screw receiving tube portion 24 and each arm portion 15. The tip of each arm portion 15 is connected to each screw receiving tube portion 24 so that the vibration of the weight 5 is not transmitted, the vibration of the enclosure 13 is suppressed, and the air flow due to the vibration of the diaphragm 3 is hindered. Is prevented.

  A first buffer portion 31 having a C-shaped cross section and supporting the frame 8 of the speaker unit 7 is formed at a peripheral portion surrounding the sound emitting hole 17 of the outer shell 18. The 1st buffer part 31 is connected to the peripheral part through the narrowed weak part 31a, absorbs the vibration transmitted from the frame 8 by the 1st buffer part 31, and prevents it being disperse | distributed to the circumference | surroundings. .

  In addition, a second buffer portion 32 is formed in a part of the peripheral edge surrounding the fitting hole 19 of the enclosure 13. Similarly to the weakened portion 31a of the first buffered portion 31, the second buffered portion 32 is connected to the periphery thereof through the narrowed weakened portion 32a, and absorbs vibration transmitted from the attachment body 6 by the second buffered portion 32. Dispersion to the surroundings is prevented.

  As described above, since the first buffer portion 31 and the second buffer portion 32 are formed in the enclosure 13, it is unnecessary to prevent acoustic reproducibility from the dashboard 2 through the bracket 29 and the attachment body 6 to the enclosure 13. Of the spindle shape, egg shape, or teardrop shape in which an ideal air flow that does not cause resonance or the like is obtained in the internal space 21 in which the speaker unit 7 and the weight 5 are accommodated. The enclosure 13 forming the part can be realized. Such an enclosure 13 may be formed by blow molding a thermoplastic synthetic resin such as polytetrafluoroethylene (abbreviation TEF).

  Of the plurality of parts constituting the speaker unit 7, a predetermined part having a large inertial mass, that is, the aforementioned weight 5 is mounted on the attachment body 6. The weight 5 is fixed to the attachment body 6 with bolts 26. The attachment body 6 is a plate-like member obtained by cutting an aluminum alloy, and has higher rigidity than the enclosure 13. The peripheral edge is supported in contact with the opening peripheral edge of the enclosure 13 facing the fitting hole 19 from the inner space 21 side, and is fitted in and held in the second buffer part 32. A flange portion 27 is integrally formed.

  On the lower surface of the mounting body 6, a bracket 29 for allowing unevenness and bending of the center portion of the dashboard 2, which is a mounted portion, is fixed by screws 28. The bracket 29 has a flat plate shape in the unfolded state described later. The attachment body 6 is attached only in contact with the bracket 29 and not in contact with the enclosure 13.

  6 is a development view showing the bracket 29, FIG. 7 is a side view of the bracket 29 as seen from below in FIG. 6, and FIG. 8 is an enlarged sectional view as seen from the section line VIII-VIII in FIG. . The bracket 29 is connected to the attachment body 6 and has a base portion 34 having a quadrangular planar shape, and first to third leg portions 35a, 35b, and 35c that are a plurality of leg portions extending from the peripheral edge portion of the base portion 34. In the base portion 34, tapping holes 36 protruding from one surface are formed in the vicinity of the four corners.

  The first leg portion 35a is formed extending in the out-of-plane direction at the longitudinal center of one side portion of the base portion 34, and a through hole 37a is formed at the distal end portion of the first leg portion 35a. In addition, second and third leg portions 35b and 35c extending in the out-of-plane direction and in directions away from each other are formed at both longitudinal ends of the other side portion of the base portion 34. Through holes 37b and 37c are formed at the tip portions of the second and third leg portions 35b and 35c, respectively.

  When such a speaker device 1 is attached to the center portion of the dashboard 2 inclined to the vehicle, the bracket 29 is fixed to the attachment body 6 by the bolt 26, and then the first to third legs 35a to 35c of the bracket 29 are fixed. A tool 39 such as a wrench is engaged with each of the through holes 37a to 37c to bend the first to third leg portions 35a to 35c in accordance with the unevenness and curvature of the dashboard 2, and a screw 38 is inserted into each of the through holes 37a to 37c. Is inserted and screwed into the dashboard 2 to be fixed.

  Thus, the bracket 29 having a plurality of (three in the present embodiment) legs 35a to 35c allows the dashboard 2 to match the shape of the mounting portion of the dashboard 2 even when the mounted portion is not flat. The speaker device 1 can be installed without hindering the field of view of the driver or the passenger on the front passenger seat.

  FIG. 9 is a cross-sectional view showing a speaker device 1a according to another embodiment of the present invention. Note that portions corresponding to those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. In the above-described embodiment, the configuration in which the speaker device 1 is mounted on the inclined dashboard 2 using the bracket 29 has been described. However, when the mounted portion such as the dashboard 2 is flat, the bracket 29 is used. Instead, the attachment body 6 may be directly fixed and attached to the dashboard 2 or the like as the attachment portion with a bolt or the like. Even in such a case, it is possible to achieve the same effect as the above-described embodiment.

  The speaker devices 1 and 1a of the above-described embodiments can be preferably implemented as a center speaker of a vehicle speaker system. In such a case, more remarkable sound reproducibility can be realized.

It is sectional drawing which shows the speaker apparatus 1 of one Embodiment of this invention. It is a perspective view which shows the external appearance of the speaker apparatus 1 shown in FIG. 2 is a rear view of the speaker device 1. FIG. 1 is a front view of a speaker device 1. FIG. 2 is a bottom view of the speaker device 1. FIG. FIG. 6 is a development view showing a bracket 29. It is a side view of the bracket 29 seen from the lower part of FIG. It is the expanded sectional view seen from the cut surface line VIII-VIII of FIG. It is sectional drawing which shows the speaker apparatus 1a of other form of implementation of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a Speaker apparatus 2 Dashboard 3 Diaphragm 4 Drive part 5 Weight 6 Attachment body 7 Speaker unit 8 Frame 9 Shaft part 10 Fitting recess 13 Enclosure 14 Base 15 Arm part 16 Buffering member 17 Sound emitting hole 18 Outer shell 19 Fitting hole 20 Bottom portion 21 Internal space 22 Central tube portion 23 Screw insertion tube portion 24 Screw receiving tube portion 29 Bracket 31 First buffer portion 32 Second buffer portion 35a to 35c First to third legs

Claims (10)

A speaker unit having a drive unit that mechanically vibrates the diaphragm in response to an acoustic signal;
An acoustic load coupled to the drive unit;
An enclosure for housing the speaker unit and the acoustic load and holding the diaphragm;
A speaker device, comprising: an attachment body fixed to an attachment portion, to which the enclosure is attached, and to which the acoustic load is connected.   The speaker device according to claim 1, wherein the attachment body is the acoustic load.   3. The speaker device according to claim 1, wherein only the attachment body is in contact with the attached portion and is not in contact with the enclosure.   The enclosure forms a part of a spindle shape, an egg shape, or a tear shape that provides an ideal air flow in an internal space in which the speaker unit and the acoustic load are accommodated. The speaker device according to any one of the above.   The speaker device according to claim 1, wherein a predetermined part having a large inertial mass among a plurality of parts constituting the speaker unit is mounted on the attachment body.   The speaker device according to claim 1, wherein a buffer material is interposed between the attachment body and the enclosure.   The speaker device according to any one of claims 1 to 6, further comprising a flat bracket having a base connected to the attachment body and a plurality of legs extending from a peripheral edge of the base. .   The said speaker apparatus is mounted in a vehicle, The speaker apparatus as described in any one of Claims 1-7 characterized by the above-mentioned.   The speaker device according to claim 1, wherein the speaker device is installed on a dashboard of a vehicle.   The speaker device according to claim 1, wherein the speaker device is a center speaker of a vehicle speaker system.

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