Speaker Device

A speaker device is provided with: a housing having a box body and a lid for closing the box body, a partition wall configured to separate the inside of the housing to form a plurality of spaces, a plurality of speaker units accommodated in the spaces, respectively, a wiring board configured to electrically connect the speaker units to the outside, and an elastic member provided between the partition wall and the lid, and closing the gap with the periphery of the wiring board in a state that the elastic member holds the wiring board.

TECHNICAL FIELD

This disclosure relates to a closed type speaker device having a housing (casing) to which a speaker unit is attached.

BACKGROUND ART

A closed type speaker device is known where a speaker unit is attached to a housing having sealability. The housing is generally called an enclosure as well. Moreover, a speaker device is known that has a plurality of speaker units taking charge of different frequency bands assigned thereto.

Such a closed type speaker device is hermetically closed so that the air inside the housing (enclosed space) does not leak to the outside, and various contrivances are made on the structure of the electric signal connection between the inside of the housing and the outside of the housing.

For example, Patent Document 1 discloses to use a printed circuit board as the structure of the electric signal connection between the inside of a box body and the outside of the box body and enable an electric signal to be transmitted between the inside and outside of the box body with the sealability of the box body being maintained irrespective of warpage of the printed circuit board by pinching the printed circuit board in part of the box body having sealability vertically to the lid closing direction thereof (the direction in which the lid is engaged with the box body).

In this case, it is described that the shapes of the cross section of the printed circuit board and an angular hole formed on the box body are made the same to thereby maintain the sealability. By doing this, even if warpage occurs on the printed circuit board, the warpage of the printed circuit board can be corrected by fixing the lid, which enables the electric connection between the inside of the box body and the outside of the box body while maintaining the sealability.

PRIOR ART DOCUMENT

Patent Document

SUMMARY OF THE INVENTION

Problems that the Invention is to Solve

However, when a speaker device is structured as described in Patent Document 1, if the dimension accuracy of the angular hole of the box body and the printed circuit board is low, it is difficult to secure sealability. Moreover, if vibrations of the box body are transmitted to the printed circuit board, an abnormal noise (a vibrating noise, a resonant noise, etc.) can be caused by the vibrations. Further, since the warpage of the printed circuit board is corrected by pressing it by the box body, an excessive load is applied to the printed circuit board, which is a cause of solder peeling and the like.

The present disclosure is made in view of such circumstances, and an object thereof is to provide a speaker device capable of easily securing the sealability of the housing and avoiding problems such as the occurrence of an abnormal noise (a vibrating noise, a resonant noise, etc.) and solder peeling.

Means for Solving the Problem

To attain the above-mentioned object, according to the present disclosure, there is provided a speaker device provided with: a housing having a box body and a lid for closing the box body; a partition wall configured to separate an inside of the housing to form a plurality of spaces; a plurality of speaker units accommodated in the spaces, respectively; a wiring board configured to electrically connect the speaker units to an outside; and an elastic member provided between the partition wall and the lid, and closing a gap with a periphery of the wiring board in a state that the elastic member holds the wiring board.

Advantage of the Invention

According to the present disclosure, by closing the gap around the wiring board by the elastic member, the sealability of the spaces where the speaker units are disposed, respectively, can be easily secured, and since the wiring board is supported by being pinched between the elastic members, problems such as the occurrence of an abnormal noise and solder peeling can be avoided.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present disclosure will be described by using the drawings.

FIG. 1andFIG. 2are views showing a speaker device1of a first embodiment, a wall (bottom portion31) having a sound emitting surface of the speaker is placed on the lower side and the back side of the speaker device1is placed on the upper side. The speaker device1is, as shown inFIG. 1, a closed type speaker device having speaker units2aand2bprovided with a voice coil, a magnet and the like.

A housing5of the speaker device1is made of a rigid body such as plastic, and has a box body3to which the speaker units2aand2bare attached and a lid4closing the box body3. In two spaces6aand6bformed inside the housing5, the speaker units2aand2bare separately accommodated.

InFIG. 1andFIG. 2, the speaker unit2ataking charge of intermediate and high frequency bands is disposed in the left side space6aof the housing5, and the speaker unit2btaking charge of a low frequency band is disposed in the right side space6b.

These speaker units2aand2bare electrically connected to a non-illustrated external apparatus through a wiring board7. Although not shown, the speaker units2aand2band the wiring board7are connected by a signal line (wiring) or the like to input an electric signal for vibrating the speaker units2aand2b.

The box body3is provided with, as shown inFIG. 1andFIG. 3, the bottom portion31bonded with cone portions21of the speaker units2aand2bbeing exposed to the outside, a side wall32vertically provided upward from the periphery of the bottom portion31so as to surround it, and a partition wall33separating into two the internal space surrounded by the side wall32. The box body3is formed in a substantially rectangular parallelepiped box body shape where the back side of the speaker units2aand2bis opened.

Moreover, the partition wall33separating the spaces6aand6bis provided with a mount portion34where a lower elastic member81is mounted. The mount portion34is wider than the remaining part of the partition wall33when viewed from above. This mount portion34is provided with guide portions35that hold both side portions of the lower elastic member81so as to be removably insertable along the partition wall33(in a direction of attachment and detachment of the lid4to and from the housing5), so that the lower elastic member81can be mounted on the mount portion34in a stable state.

InFIG. 1andFIG. 3, the mount portion34is provided in a lower part between opposed parts of the guide portions35, and the rectangular parallelepiped lower elastic member81is mounted on the mount portion34.

Moreover, the lid4is provided with, as shown inFIG. 1andFIG. 4, a ceiling portion41covering the back surfaces of the speaker units2aand2b, a side wall42vertically provided from the periphery of the ceiling portion41so as to surround it, and a partition wall (partition wall portion)43separating into two the internal space surrounded by the side wall42. By closing the opening of the box body3by the lid4, the spaces6aand6bpartitioned by the partition walls33and43are formed inside the housing5. Reference numeral49shown inFIG. 4represents an opening formed in the ceiling portion41of the lid4in order to expose to the outside a connector71for external connection provided on the wiring board7.

Moreover, on the partition wall43of the lid4, a mount portion44and guide portions45are provided in a similar structure to that of the mount portion34of the partition wall33of the box body3, and a rectangular parallelepiped upper elastic member82is provided on the mount portion44. The lower elastic member81of the box body3and the upper elastic member82of the lid4are disposed so as to be opposed to each other with the wiring board7in between. These lower elastic member81and upper elastic member82are made of, for example, urethane resin.

The wiring board7is disposed vertically to the partition walls33and43of the box body3and the lid4, and as shown inFIG. 5, is disposed in a state of being pinched between the lower elastic member81provided on the partition wall33of the box body3and the upper elastic member82provided on the partition wall43of the lid4. In that case, the lower elastic member81and the upper elastic member82are in contact with the wiring board7at the central parts thereof and are in contact with each other at both end parts thereof, thereby closing the gap around the wiring board7.

Moreover, on the wiring board7, the connector71for external connection is placed, and most part (first part) of the connector71is disposed, as shown inFIG. 1andFIG. 2, on the left side of the partition walls33and43, that is, in the space6awhere the speaker unit2ataking charge of the high frequency band is disposed. On the other hand, the remaining part (second part) of the connector71is disposed, as shown inFIG. 1andFIG. 2, on the right side of the partition walls33and43, that is, in the space6bwhere the speaker unit2btaking charge of the low frequency band is disposed. Around the connector71, a gasket83is pasted. Under a condition where the box body3is closed by the lid4, although the connector71is exposed to the outside from the opening49, the peripheral wall of the opening49formed in the ceiling portion41of the lid4is in contact with the gasket83provided around the connector71, so that the sealability of the space6acan be secured.

In the speaker device1structured as described above, by pinching the wiring board7between the lower elastic member81and the upper elastic member82, the gap between the wiring board7and the partition walls33and43where the wiring board7is placed can be closed. Since a slight size difference and warpage of the wiring board7can be absorbed by the lower elastic member81and the upper elastic member82, the sealability of the spaces6aand6bwhere the speaker units2aand2bare disposed, respectively, can be easily secured.

Moreover, since the wiring board7is in contact with the housing5(the partition wall33of the box body3and the partition wall43of the lid4) through the lower elastic member81and the upper elastic member82, vibrations of the housing5are not readily transmitted to the wiring board7. Consequently, the occurrence of an abnormal noise by the vibrations can be prevented. Further, regarding the wiring board7held by the lower elastic member81and the upper elastic member82, since the warpage of the wiring board7is not forcibly corrected, the occurrence of solder peeling and the like can be avoided.

Moreover, the mount portions34and44are wider than the remaining parts of the partition walls33and43, and further, the guide portions35and45holding the lower elastic member81and the upper elastic member82are provided on the mount portions34and44. For this reason, the lower elastic member81and the upper elastic member82can be mounted on the partition walls33and34in a stable state. And the wiring board7can be held in a stable state also when the wiring board7is mounted on the lower elastic member81and the upper elastic member82provided in this manner. Consequently, the workability of assembly can be improved, and the tolerance of the wiring board7to vibrations can be enhanced. Moreover, since the lower elastic member81and the upper elastic member82are removably insertable into the guide portions35and45, when wear and the like occur on the lower elastic member81and the upper elastic member82, the lower elastic member81and the upper elastic member82can be changed.

Moreover, in the speaker device1, the connector71for external connection is provided in the space6awhere the speaker unit2ataking charge of the high frequency band is disposed, whereas no connector for external connection is provided in the space6bwhere the speaker unit2btaking charge of the low frequency band is disposed, so that the sealability of the space6bwhere the speaker unit2btaking charge of the low frequency band is disposed can be secured with reliability.

In the speaker device1of the above-described embodiment, the gap around the wiring board7is closed by the lower elastic member81and the upper elastic member82to thereby secure the sealability of the spaces6aand6bwhere the speaker units2aand2bare disposed, respectively. However, as substitutes for the lower elastic member81and the upper elastic member82, a single elastic member85shown inFIG. 6(a) toFIG. 6(c) or a single elastic member86shown inFIG. 7(a) toFIG. 7(c) may be used.

As shown inFIG. 6(a), in the elastic member85, a slit85aextending in a direction parallel to the wiring board7is formed. As shown inFIG. 6(b), a part of the wiring board7is inserted or press-fitted into the slit85aof the elastic member85. As shown inFIG. 6(c), by assembling the wiring board7between the box body3and the lid4under the condition where it is inserted or press-fitted in the slit85aof the elastic member85and pinched by the elastic member85, the gap around the wiring board7can be easily closed. As the material for the elastic member85, a cushion material having moderate hardness or elastomer or the like that is easy to shape with a mold is used since the slit85ais easily formed.

Moreover, as shown inFIG. 7(a), the elastic member86is elongated, and the cross section thereof is, for example, square. As shown inFIGS. 7(b) and7(c), the elastic member86is disposed on either the mount portion34or the mount portion44, and further, the wiring board7is disposed on the elastic member86. Then, by folding both end portions of the elastic member86so as to cover the upper surface of the wiring board7, the end portions of the elastic member86are laid one over the other on the top surface of the wiring board7so that the wiring board7is pinched by the elastic member86, whereby the gap around the wiring board7can also be closed. The elastic member86may be not only provided on the mount portion34on the side of the box body3as shown inFIG. 7(c) but also provided, although not shown, on the mount portion44on the side of the lid4. The gap around the wiring board7may be closed by providing the elastic member86on either the box body3or the lid4as described above. The elastic member86is made of, for example, a cushion material having flexibility and restorability so that the sealability of the overlaid part of the elastic member86is not impaired.

FIG. 6(c) shows a speaker device101of a second embodiment of the present disclosure. This speaker device101is, like the speaker device1of the first embodiment, a closed type speaker device having two speaker units102aand102b.

In the speaker device101, a housing105has a box body103and a lid104closing the box body103. In the housing105, two spaces106aand106bseparated by a partition wall133are formed. The speaker unit102ataking charge of intermediate and high frequency bands and the speaker unit102btaking charge of a low frequency band are separately accommodated in the spaces106aand106bof the housing105, respectively. Moreover, a bass reflex port109is placed in the space106bwhere the speaker unit102btaking charge of the low frequency band is disposed, and a bass reflex type speaker system is provided. Moreover, an opening (not shown) for the bass reflex port is provided in a bottom portion131of the box body103.

InFIG. 6(c), in order that the internal structure of the speaker device101can be checked, regarding the box body103, a wall (bottom portion131) having a sound emitting surface of the speaker is disposed on the lower side and the back side of the speaker device101is disposed so as to face upward, whereas regarding the lid104, the inner surface side of the lid104is disposed so as to face upward.

The bass reflex type speaker system intensifies the low pitch sound of the speaker unit102bby Helmholtz resonance by phase-inverting the low pitch sound generated by the speaker unit102bby passing it through the bass reflex port109. In order to dispose the elongated bass reflex port109, the space106bis formed so as to elongate toward the side opposite to the space106a. Moreover, parts such as the connector71for external connection and a capacitor (not shown) mounted on a wiring board107are disposed on the side of the adjoining space106a, so that the space106bcan be secured without affected by the parts such as the connector71and the capacitor.

The rest of the structure is the same as that of the first embodiment, and common parts are denoted by the same reference numerals and descriptions thereof are omitted.

In the speaker device101, the sealability of the spaces106aand106bwhere the speaker units102aand102bare disposed, respectively, can also be secured with ease by closing the gap around the wiring board107by the lower elastic member81and the upper elastic member82as in the speaker device1of the first embodiment.

Moreover, regarding the wiring board107, since the parts such as the connector71and the capacitor are unevenly distributed in the space106awhere the speaker unit102ataking charge of the high frequency band is disposed, most of the substrate area is situated in the space106a. For this reason, the arrangement of the wiring board107is unbalanced with respect to the support portion by the lower elastic member81and the upper elastic member82. However, since the wiring board107is supported by being pinched by the lower elastic member81and the upper elastic member82, the occurrence of vibrations can be suppressed, so that problems such as the occurrence of an abnormal noise and solder peeling can be avoided.

As described above, the present disclosure is also applicable to a speaker device having a bass reflex port.

While in the second embodiment, description is given by using a speaker unit having two speaker units, a structure having three or more speaker units may be adopted such as a structure having three speaker units202ato202cfor high pitch sounds, for intermediate pitch sounds and for low pitch sounds, respectively, like a speaker device201shown inFIG. 8.

For example, in the speaker device201shown inFIG. 9, the speaker units202ato202care accommodated in a plurality of spaces206ato206clined up inside a box body203, respectively, and these speaker units202ato202care electrically connected to a wiring board207disposed along the longitudinal direction of the box body203, whereby electric connection with the outside is secured through this wiring board207. In this case, by disposing the connector71in the space206aaccommodating the speaker unit202afor high pitch sounds taking charge of the highest frequency band, the sealability of the space206caccommodating the speaker unit202cfor low pitch sounds taking charge of the low frequency band and the space206baccommodating the speaker unit202bfor intermediate pitch sounds which spaces require high sealability is ensured, and high reliability can be maintained.

The embodiments of the present disclosure will be summarized below.

The speaker device of the present disclosure is provided with: the housing having the box body and the lid for closing the box body; the partition wall configured to separate an inside of the housing to form a plurality of spaces; a plurality of speaker units accommodated in the spaces, respectively; the wiring board configured to electrically connect the speaker units to the outside; and the elastic member provided between the partition wall and the lid, and configured to close the gap with the periphery of the wiring board in a state that the elastic member holds the wiring board.

For example, the wiring board is disposed vertically to the partition wall.

By pinching the wiring board by the elastic members, the gap between the partition wall formed for placing the wiring board and the lid can be closed. Moreover, since a certain degree of size difference and warpage (of the cross section) of the wiring board can be absorbed by the elastic members, the sealability of the spaces where the speaker units are disposed, respectively, can be easily secured.

Moreover, since the wiring board is in contact with the housing (the partition wall of the box body and the lid) through the elastic members, vibrations of the housing are not readily transmitted to the wiring board, so that the occurrence of an abnormal noise by the vibrations can be prevented. Further, since the wiring board held by the elastic members is not forcibly corrected, the occurrence of solder peeling and the like can be avoided.

For example, the partition wall has the mount portion formed so as to be wider than the remaining part of the partition wall and where the elastic member is mounted and a guide portion that holds both side portions of the elastic member, mounted on the mount portion, so as to be removably insertable along the partition wall.

By providing the mount portion wider than the remaining part of the partition wall and further providing the guide portion holding the elastic member on the mount portion, the elastic member can be mounted on the partition wall in a stable state. Moreover, since the wiring board can be held in a stable state also when the wiring board is mounted on the elastic members provided in this manner, the workability of assembly can be improved, and the tolerance of the wiring board to vibrations can be enhanced. Moreover, since the elastic members are removably insertable into the guide portions, when wear and the like occur, the elastic members can be changed.

In the speaker device of the present invention, for example, the elastic member has the lower elastic member provided on the partition wall and the upper elastic member provided on the lid, and the wiring board is disposed in a state of being pinched between the lower elastic member and the upper elastic member.

In this case, by pinching the wiring board between the lower elastic member provided on the partition wall side (box body side) and the upper elastic member provided on the lid side, the gap around the wiring board can be easily closed.

Moreover, in the speaker device of the present invention, a structure may be adopted in which the elastic member is provided on either the partition wall or the lid and the wiring board is disposed in a state of being pinched by the elastic member.

For example, the speaker units take charge of different frequency bands, respectively, the connector for external connection is provided on the wiring board, and the connector for external connection is disposed in the space accommodating the speaker unit taking charge of the high frequency band.

The space where the speaker unit taking charge of the low frequency band is disposed is higher in sound pressure level than the space where the speaker unit taking charge of the high frequency band is disposed, and is required to have a high sealability accordingly. Therefore, by providing the connector for external connection in the space where the speaker unit taking charge of the high frequency band is disposed, the sealability of the space where the speaker unit taking charge of the low frequency band is disposed can be secured with reliability.

For example, the first part of the wiring board extending in the space, of the housing, accommodating the speaker taking charge of the high frequency band is larger in mounting area than the second part of the wiring board extending in the space accommodating the speaker, of the speakers, taking charge of another frequency band.

While the present disclosure has been described in detail and with reference to specific embodiments, it is obvious to one of ordinary skill in the art that various changes and modifications are possible without departing from the spirit, scope or scope of the intension of the present disclosure.

The present invention is based upon Japanese Patent Application (Patent Application No. 2012-203853) filed on Sep. 18, 2012 and Japanese Patent Application (Patent Application No. 2013-188305) filed on Sep. 11, 2013 the contents of which are incorporated herein by reference.

INDUSTRIAL APPLICABILITY

A speaker device capable of easily securing the sealability of the housing and avoiding problems such as the occurrence of an abnormal noise (a vibrating noise, a resonant noise, etc.) and solder peeling, particularly, a closed type speaker can be provided.

DESCRIPTION OF REFERENCE NUMERALS AND SIGNS