JP2006340015A - Speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent tone quality deterioration due to occurrence of unnecessary vibration in a frame etc. and temperature rising in a magnetic circuit. <P>SOLUTION: A speaker device comprises: a first frame 53 for supporting a vibration system component such as a vibration cone 43; and a second frame 59 for supporting a magnetic circuit 57 for driving the vibration system component, in separate bodies. The second frame 59 is coupled to the first frame 53 through a packing 75, and forms a sealing space covering the back of the vibration cone 43. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a conductive speaker device in which a frame that supports a diaphragm has a function as an enclosure that seals the back of the diaphragm.

FIG. 1 is a longitudinal sectional view of a conventional general conductive speaker device.
The speaker device 1 includes a speaker unit 3 and a cabinet 5 that houses the speaker unit 3.
The speaker unit 3 includes a diaphragm 7, an edge 9 integrated with the outer periphery of the diaphragm 7, a voice coil 13 wound around a voice coil bobbin 11 fixed to the center of the diaphragm 7, A voice coil support damper 15 whose circumference is joined to the voice coil bobbin 11 and extends outward in the radial direction, a frame 17 supporting the edge 9 and the outer peripheral edge of the damper 15, and the voice coil 13 are inserted. The magnetic circuit 21 is fixed to the rear end of the frame 17 with a magnetic circuit 21 having a magnetic gap 19.

The cabinet 5 defines a sealed chamber 23 at the back of the diaphragm 7 so that the sound radiated from the diaphragm 7 of the speaker unit 3 to the back side does not interfere with the sound radiated from the diaphragm 7 to the front side. This is an enclosure.
The cabinet 5 is generally a rectangular parallelepiped box, and an opening 5b for dropping the speaker unit 3 into a baffle plate 5a on the front surface is formed.
The opening 5b is dimensioned so that the mounting flange 17a extending around the outer periphery of the frame 17 is caught at the periphery of the opening 5b, and the mounting flange 17a is screwed to the baffle plate 5a to The unit 3 is fixed to the cabinet 5.

By the way, although the speaker apparatus 1 of the form which accommodates the speaker unit 3 in the cabinet 5 for exclusive use has the advantage that a sufficient volume can be ensured in the sealed chamber 23, it enlarges on the other hand. For this reason, it is not suitable for applications that require downsizing of the speaker device, for example, applications that are incorporated into displays such as CRT, liquid crystal, and PDP.
Further, the vibration of the diaphragm 7 and the damper 15 when the speaker is operated and the vibration of the magnetic circuit 21 that vibrates due to the reaction of the amplitude drive of the voice coil 13 are all concentrated on the baffle plate 5a through the frame 17. Therefore, there is a problem that unnecessary vibration of the baffle plate 5a and the cabinet 5 itself is likely to be caused, and the unnecessary vibration of the baffle plate 5a and the cabinet 5 itself hinders improvement in sound quality.

Therefore, a speaker device 31 having the form shown in FIG. 2 has been proposed.
The speaker device 31 is disclosed in the following Patent Document 1, and the outer periphery of the damper 15 whose inner periphery is joined to the voice coil bobbin 11 is supported by a bracket 25 fixed to the top plate 21a of the magnetic circuit 21. The main feature is that the cabinet 5 itself is abolished and the frame 27 itself supporting the outer peripheral edge of the edge 9 is improved in a structure in which the sealed chamber 23 is defined on the back of the diaphragm.
In FIG. 2, parts that are the same as those in FIG.

  The frame 27 has a bottomed cylindrical structure, and the bottom side functions as an enclosure that defines the sealed chamber 23 on the back of the diaphragm 7. An edge support portion 27 a that supports the outer peripheral edge of the edge 9 is provided on the front end edge of the peripheral wall of the frame 27. Further, the center of the bottom wall portion of the frame 27 is a circuit fixing portion 27b that protrudes forward and fixes the bottom plate 21b of the magnetic circuit 21 tightly.

In the above speaker device 31, the damper 15 is fixed to the magnetic circuit 21 and is fixed to the circuit fixing portion 27 b of the frame 27 via the magnetic circuit 21. The diaphragm 7 is fixed to the edge support portion 27 a at the front end of the frame 27 through the edge 9.
That is, since the diaphragm 7 and the magnetic circuit 21 are dispersed and supported, unnecessary vibrations are not concentrated on a part of the frame 27, and deterioration of sound quality due to unnecessary vibrations of the frame 24 can be suppressed. It becomes possible.
Further, since the dedicated cabinet 5 is eliminated, the size can be easily reduced, and the product can be commercialized in the form of being incorporated in a display such as a CRT, a liquid crystal, or a PDP.

JP 10-98789 A

However, in the case of the configuration shown in FIG. 2, the effect of suppressing the occurrence of unnecessary vibrations can be obtained by distributing the vibration transmission locations to the frame 27, but the frame 27 is a single structure, Since all the vibrations are received by the frame 27 itself, there is a limit to the effect of suppressing the generation of unnecessary vibrations, and new improvements have been required in order to achieve higher quality sound reproduction.
In the case of the configuration shown in FIG. 2, the frame 27 defines the sealed chamber 23 so as to accommodate the entire magnetic circuit 21, so that the heat generated in the magnetic circuit 21 is trapped in the sealed chamber 23, and the magnetic circuit 21. Due to the abnormal temperature rise, the operating performance of the magnetic circuit 21 may be reduced, leading to a decrease in sound quality.

  Problems to be solved by the present invention include a problem that the effect of suppressing the occurrence of unnecessary vibration in a frame or the like that occurs in the above-described prior art is small and it is difficult to further improve the sound quality, or the heat generation of the magnetic circuit. Thus, the problem that abnormal temperature rise of the magnetic circuit leads to deterioration of sound quality can be cited as an example.

  In order to solve the above-described problem, the speaker device according to claim 1 includes a diaphragm, an edge integrated with an outer periphery of the diaphragm, and a voice wound around a voice coil bobbin fixed to the diaphragm. A coil, a damper for supporting a voice coil whose inner periphery is joined to the voice coil bobbin and extending radially outward, a first frame that supports the edge and the outer peripheral edge of the damper, and the voice coil is inserted A magnetic circuit having a magnetic gap and a second frame formed separately from the first frame and having a magnetic circuit support part for supporting the magnetic circuit, the second frame having a packing A sealed space is formed which is coupled to the first frame via the cover and covers the back portion of the diaphragm.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a speaker device according to the invention will be described in detail with reference to the drawings.
FIG. 3 is a longitudinal sectional view showing a schematic configuration of the first embodiment of the speaker device according to the present invention.

  The speaker device 41 according to the first embodiment includes a cone-shaped diaphragm 43, a roll edge 45 integrated on the outer periphery of the diaphragm 43, and a cylindrical shape fixed to the center of the diaphragm 43. A voice coil bobbin 47, a voice coil 49 wound around the outer periphery of the voice coil bobbin 47, a damper 51 for supporting a voice coil whose inner periphery is joined to the voice coil bobbin 47 and extends radially outward, and the edge 45 and the first frame 53 supporting the outer periphery of the damper 51, the magnetic circuit 57 having the magnetic gap 55 into which the voice coil 49 is inserted, and the first frame 53 are formed separately from the magnetic circuit 57. And a second frame 59 having a magnetic circuit support portion 59a to support.

The first frame 53 includes a flange-shaped edge support portion 53a that closely contacts and supports the outer peripheral edge of the roll edge 45, a flange-shaped damper support portion 53b that supports the outer peripheral edge of the damper 51, and the support portions 53a, 53a, A connecting portion 53c that connects 53b and a baffle portion 53d that extends radially outward from the outer periphery of the edge support portion 53a and functions as a baffle plate are integrally formed.
The connection portion 53c is appropriately equipped with an opening that allows sound emitted from the diaphragm 43 to the back portion to pass to the sealed space 61 side defined by the second frame 59.
The baffle portion 53 d is a coupling portion whose outer peripheral edge is abutted against the second frame 59.

  The magnetic circuit 57 includes a bottom plate 71 having a center pole 71a standing at the center thereof, a magnet 72 formed in a ring shape surrounding the periphery of the center pole 71a and installed on the bottom plate 71, and the magnet 72 A ring-shaped top plate 73 sandwiched between the bottom plate 71 and a gap between the inner periphery of the top plate 73 and the center pole 71 a functions as the magnetic gap 55.

The second frame 59 is formed in a substantially bottomed cylindrical shape or a box shape with the top opened by a peripheral wall portion 59b and a bottom wall portion 59c. The upper edge of the peripheral wall portion 59 b of the second frame 59 is coupled to the outer periphery of the baffle portion 53 d of the first frame 53 via the packing 75 to form a sealed space 61 that covers the back portion of the diaphragm 43. .
The packing 75 is made of a material having excellent vibration-proof characteristics and sealing properties, such as vibration-damping rubber.

  On the bottom wall portion 59c of the second frame 59, a magnetic circuit support portion 59a that is tightly coupled to the bottom plate 71 and supports the magnetic circuit 57 is raised. The magnetic circuit support 59a is provided with an opening 59d that exposes most of the bottom plate 71, which is the back surface of the magnetic circuit 57, to the outside.

In the case of the present embodiment, the first frame 53 and the second frame 59 are made of different materials so that unnecessary vibration is attenuated by the difference in vibration transmission characteristics.
For example, when the first frame 53 is made of a steel plate, the second frame 59 is made of aluminum die cast.
Since the second frame 59 supports the magnetic circuit 57 that generates heat, the second frame 59 is preferably formed of a material having high thermal conductivity, and aluminum die casting is preferable.
However, the specific material of the first frame 53 and the second frame 59 is not limited to the above embodiment. The first frame 53 can be made of an aluminum alloy having a different composition from that of the second frame 59, and a titanium alloy or cast iron having a different composition so that the vibration transmission characteristics thereof are different from each other can be appropriately used. It is possible to combine them.

  In the speaker device 41 described above, the first frame 53 and the second frame 59 define a sealed space 61 on the back surface of the diaphragm 43 to function as an enclosure. The product can be easily made into a product that can be incorporated into a monitor or the like.

  Further, the frame that is a support structure for supporting the vibration system component and the magnetic circuit 57 is divided into the first frame 53 and the second frame 59, and the support of the roll edge 45 and the damper 51 that are the vibration system component is the first. The vibration transmitted from the vibration system component is the vibration transmitted from the magnetic circuit 57 by the reaction of the amplitude drive of the magnetic gap 55 because the first frame 53 shares the support and the magnetic circuit 57 supports the second frame 59. Are distributed to the separate frames 53 and 59, and unnecessary vibrations do not act in a concentrated manner, so that generation of unnecessary vibrations in the frame is suppressed. Further, since the first frame 53 and the second frame 59 are coupled via the packing 75 and the vibration propagation between the respective frames can be attenuated by the packing 75, the effect of suppressing unnecessary vibration is improved. It is possible to improve sound quality by preventing unnecessary vibration.

  Furthermore, in the present embodiment, the first frame 53 and the second frame 59 are formed of materials different from each other in vibration transfer characteristics, and vibration propagation between them is attenuated by the difference in vibration transfer characteristics. Therefore, the occurrence of unnecessary vibration on the frame can be further reduced, and high sound quality can be achieved.

Furthermore, in the configuration of the present embodiment, the magnetic circuit support portion 59a that supports the magnetic circuit 57 of the second frame 59 is provided with an opening 59d that exposes the back surface of the magnetic circuit 57 to the outside. Can be dissipated to the outside through the opening 59d to prevent heat from being trapped in the sealed space 61.
Therefore, the heat generation of the magnetic circuit 57 does not cause an abnormal temperature rise of the magnetic circuit 57, and the sound quality can be prevented from being lowered due to the abnormal temperature rise of the magnetic circuit 57, thereby further improving the sound quality.

FIG. 4 is a longitudinal sectional view showing a schematic configuration of the speaker device according to the second embodiment of the present invention.
The speaker device 81 of the second embodiment is a part of the structure of the second frame 59 of the first embodiment, and is otherwise the same as that of the first embodiment. Components common to those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the case of the speaker device 81 of the second embodiment, the magnetic circuit support portion 59a of the second frame 59 supports the top plate 73 located on the vibration plate 43 side of the magnetic circuit 57. Substantially the entire circuit 57 is exposed to the outside of the second frame 59 through the opening 59d.

  By adopting such a configuration, the heat generated by the magnetic circuit 57 can be easily released to the outside, the temperature rise of the magnetic circuit 57 can be further thoroughly prevented, and the sound quality can be improved by preventing the temperature rise of the magnetic circuit 57. be able to.

FIG. 5 is a longitudinal sectional view showing a schematic configuration of the speaker device according to the third embodiment of the present invention.
The speaker device 83 according to the third embodiment is obtained by improving a part of the speaker device 41 according to the first embodiment, and the first frame 85 that supports the vibration system parts extends around the outer periphery of the edge 45. A point divided into a main frame 87 to be supported and a sub frame 89 supporting the outer peripheral edge of the damper 51, and a point in which the main frame 87 and the sub frame 89 are coupled via the packing 90 are the first. This is different from the embodiment.

  The sub frame 89 has a cylindrical peripheral wall portion 89a similar to the peripheral wall portion 59b of the second frame 59, and a transverse wall 89b extending radially inward from the peripheral wall portion 89a to support the outer periphery of the damper 51. The transverse wall 89b is provided with an opening 89c that allows the space 61a on the main frame 87 side and the space 61b on the second frame 59 side to communicate with each other.

  Note that the second frame 59 is coupled to the first frame 85 via the packing 75, and the magnetic circuit support portion 59a of the second frame 59 supports the outer peripheral portion of the bottom plate 71 of the magnetic circuit 57 in a close contact state. In addition, the magnetic circuit support portion 59a is provided with a heat dissipation opening 59d, which is the same as that of the first embodiment. Other common parts are denoted by the same reference numerals as in the first embodiment, and description thereof is omitted.

  In the speaker device 83 according to the third embodiment described above, the main frame 87 that supports the roll edge 45 on the outer periphery of the diaphragm 43 and the subframe 89 that supports the damper 51 coupled to the voice coil bobbin 47 are separate. In addition, since it is configured to be coupled via the packing 90, vibration propagation from the diaphragm 43 and the damper 51 during speaker operation is further dispersed, and the vibration damping effect between the frames is synergistic, Generation of unnecessary vibration on the frame can be further reduced as compared with the first embodiment, and high sound quality can be improved by reducing unnecessary vibration.

  If the main frame 87 and the sub frame 89 constituting the first frame 85 are made of different materials so that unnecessary vibration is attenuated by the difference in vibration transmission characteristics, unnecessary vibration is generated. The effect of reducing further increases.

  As described above in detail, the speaker device 41 according to the embodiment of the present invention includes the diaphragm 43, the edge 45 integrated on the outer periphery of the diaphragm 43, and the voice fixed to the diaphragm 43. The voice coil 49 wound around the coil bobbin 47, the damper 51 for supporting the voice coil whose inner periphery is joined to the voice coil bobbin 47 and extends outward in the radial direction, and the outer periphery of the edge 45 and the damper 51 are A first frame 53 to be supported, a magnetic circuit 57 having a magnetic gap 55 into which the voice coil 49 is inserted, and a magnetic circuit support that is formed separately from the first frame 53 and supports the magnetic circuit 57. A second frame 59 having a portion 59a. The second frame 59 is coupled to the first frame 53 via a packing 75 to cover the back of the diaphragm 43. And characterized by forming between.

  As a result, the first frame 53 and the second frame 59 define a sealed space 61 on the back surface of the diaphragm 43 to serve as an enclosure, so that it is easy to reduce the size by eliminating the dedicated cabinet. Commercialization in the form of incorporation into a monitor or the like is also possible.

  Further, the frame that is a support structure for supporting the vibration system component and the magnetic circuit 57 is divided into the first frame 53 and the second frame 59, and the support of the roll edge 45 and the damper 51 that are the vibration system component is the first. The vibration transmitted from the vibration system component is the vibration transmitted from the magnetic circuit 57 by the reaction of the amplitude drive of the magnetic gap 55 because the first frame 53 shares the support and the magnetic circuit 57 supports the second frame 59. Are distributed to the separate frames 53 and 59, and unnecessary vibrations do not act in a concentrated manner, so that generation of unnecessary vibrations in the frame is suppressed. Further, since the first frame 53 and the second frame 59 are coupled via the packing 75 and the vibration propagation between the respective frames can be attenuated by the packing 75, the effect of suppressing unnecessary vibration is improved. It is possible to improve sound quality by preventing unnecessary vibration.

Furthermore, in the configuration of the embodiment of the present invention, the magnetic circuit support portion 59a that supports the magnetic circuit 57 of the second frame 59 is provided with an opening 59d that exposes the back surface of the magnetic circuit 57 to the outside. The heat generated in the circuit 57 can be radiated to the outside through the opening 59d, and heat can be prevented from being trapped in the sealed space 61.
Therefore, the heat generation of the magnetic circuit 57 does not cause an abnormal temperature rise of the magnetic circuit 57, and the sound quality can be prevented from being lowered due to the abnormal temperature rise of the magnetic circuit 57, thereby further improving the sound quality.

It is a longitudinal cross-sectional view which shows schematic structure of the conventional speaker apparatus. It is a longitudinal cross-sectional view which shows schematic structure of another conventional speaker apparatus. 1 is a longitudinal sectional view showing a schematic configuration of a first embodiment of a speaker device according to the present invention. It is a longitudinal cross-sectional view which shows schematic structure of 2nd Embodiment of the speaker apparatus based on this invention. It is a longitudinal cross-sectional view which shows schematic structure of 3rd Embodiment of the speaker apparatus based on this invention.

Explanation of symbols

41 Speaker device 43 Diaphragm 45 Edge (roll edge)
47 voice coil bobbin 49 voice coil 51 damper 53 first frame 55 magnetic gap 57 magnetic circuit 59 second frame 61 sealed space 71 bottom plate 72 magnet 73 top plate 75 packing 81 speaker device 83 speaker device 85 first frame 87 main frame 89 sub Frame 90 packing

Claims (5)

A diaphragm,
An edge integrated with the outer periphery of the diaphragm;
A voice coil wound around a voice coil bobbin fixed to the diaphragm;
A voice coil support damper having an inner periphery joined to the voice coil bobbin and extending radially outward;
A first frame that supports the outer periphery of the edge and the damper;
A magnetic circuit having a magnetic gap into which the voice coil is inserted;
A second frame having a magnetic circuit support portion that is formed separately from the first frame and supports the magnetic circuit;
The speaker device according to claim 1, wherein the second frame is coupled to the first frame via a packing to form a sealed space that covers a back portion of the diaphragm. The first frame is divided into a main frame that supports the outer peripheral edge of the edge, and a subframe that supports the outer peripheral edge of the damper,
The speaker device according to claim 1, wherein the main frame and the sub frame are coupled via a packing.   The support part of the said magnetic circuit supports the top plate located in the diaphragm side of the said magnetic circuit, The substantially whole of the said magnetic circuit was exposed to the exterior of the said 2nd frame, The Claim 1 characterized by the above-mentioned. 2. The speaker device according to 2.   The support portion of the magnetic circuit supports a bottom surface of the yoke located on the opposite side of the diaphragm of the magnetic circuit, and a part or all of the bottom surface of the magnetic circuit is exposed to the outside of the second frame. The speaker device according to claim 1 or 2.   The speaker device according to claim 1, wherein the first frame and the second frame are made of different materials.

Images