JP4452657B2 - Speaker device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a speaker device and a manufacturing method thereof.

FIG. 1 shows a configuration of a speaker device proposed by the applicant of the present invention in Patent Document 1 below.
The speaker device 1 includes a diaphragm 3 and a drive cone that is disposed behind the diaphragm 3 coaxially with the diaphragm 3 and whose inner peripheral portion is hermetically joined and integrated with the inner peripheral portion of the diaphragm 3. 5 and a frame 7 in which diaphragm support portions 7a and 7b that support the outer periphery of the diaphragm 3 and the drive cone 5 are provided on the front end side, and a magnetic circuit 9 is provided on the center axis of the rear end, A voice coil 13 wound around a voice coil bobbin 11 joined to and integrated with the inner periphery of the plate 3 and the drive cone 5 and inserted into the magnetic gap 9a of the magnetic circuit 9 is provided.

  The outer peripheral part of the diaphragm 3 is fixed to the diaphragm supporting part 7a via an edge damper 15 joined to the outer peripheral part. The outer peripheral portion of the drive cone 5 is fixed to the diaphragm support portion 7b via an edge damper 17 joined to the outer peripheral portion.

  The diaphragm support portion 7b is a step set at a position that is appropriately separated from the diaphragm support portion 7a in the axial direction by an appropriate distance. A space between the diaphragm support 7a and the diaphragm support 7b of the frame 7 is a sealed cylindrical wall in which no opening is provided. The cylindrical wall 7 c of the frame 7 closes an opening of a space 19 sandwiched between the diaphragm 3 and the drive cone 5 to form a sealed space, and includes a voice coil 13 due to the spring property of the gas enclosed in the sealed space 19. The vibration system is supported floating.

The magnetic circuit 9 includes a yoke 21 having a structure in which a cylindrical center pole 21b projects from the center of a disk-shaped plate 21a, a ring-shaped magnet 23 that is loosely fitted on the outer periphery of the center pole 21b, and a plate 21a. A ring-shaped top plate 25 is provided so as to be loosely fitted to the front end side of the center pole 21b so as to sandwich the magnet 23 therebetween.
A gap between the inner periphery of the top plate 25 and the center pole 21b is a magnetic gap 9a in which the voice coil 13 is disposed.

  The frame 7 has a shallow bowl shape, and the magnetic circuit 9 is attached to the inner surface of the bottom plate portion 7d with the plate 21a of the yoke 21 mounted thereon. Between the bottom plate portion 7d of the frame 7 and the diaphragm support portion 7b, an opening 7f as a vent hole for releasing the back pressure of the diaphragm is appropriately provided. The back surface of the diaphragm support portion 7a of the frame 7 functions as a flange surface that is tightly fixed to the baffle of the speaker cabinet.

The above speaker device 1 is manufactured by the following procedure.
First, the magnetic circuit 9 is attached to the rear part of the frame 7, and the voice coil 13 is temporarily assembled. Thereafter, the drive cone 5 is fixed to the diaphragm support 7b, and then the diaphragm 3 is assembled and fixed to the diaphragm support 7a. The inner peripheral portion of the diaphragm 3 is bonded and fixed to the inner peripheral portion of the drive cone 5 to form a sealed space 19. The voice coil bobbin 11 is bonded and fixed to the inner periphery of the drive cone 5.
When the formation of the sealed space 19 is completed, it is inspected whether the sealed property of the sealed space 19 and the characteristics as an air spring are appropriate. If appropriate, a dust cap 27 is attached to the central portion of the diaphragm 3. It will be completed. The dust cap 27 covers the front of the voice coil bobbin 11 and prevents entry of dust and the like into the magnetic gap 9a.

In such a speaker device 1, the spring characteristic as an air spring in the sealed space 19 between the diaphragm 3 and the drive cone 5 controls the vibration of the voice coil bobbin 11, the voice coil 13, the diaphragm 3 and the drive cone 5. Therefore, it is not necessary to provide a dedicated damper for control.
Therefore, the axial dimension of the speaker device 1 can be shortened by omitting the dedicated damper and its installation space, and in particular, the speaker device required for the in-vehicle audio system can be thinned.

  In addition, since the drive cone 5 can use the same material as that of the diaphragm 3, the mass is lighter and mechanical fatigue is less likely to occur compared to a conventional bellows structure damper. This can prevent the deterioration of the vibration damping performance and extend the service life of the speaker device. In addition, since there is no significant local deformation, there is no occurrence of singular vibration or rubbing noise that causes the sound quality to become turbid. High-quality sound reproduction without noise can be realized.

Japanese Patent Application No. 2003-428374

  By the way, in the manufacturing method described above, a large number of parts such as the magnetic circuit 9 are assembled to the frame 7, and then the diaphragm 3 and the drive cone 5 are assembled one by one to complete the sealed space 19. When a defect or the like of the sealed space 19 is detected, there is a problem that the reworking work requires a large weight such as the frame 7 and the magnetic circuit 9 and the reworking work is difficult.

  In addition, when the defect in the sealed space 19 cannot be repaired, there are many parts that have been incorporated so far, so that the amount of waste increases, resulting in a problem that economic loss is large.

  Furthermore, in order to reduce the defective rate of the sealed space 19, it is necessary to improve the processing accuracy of each of the diaphragm support portions 7a and 7b formed on the frame 7 which is a large component. There is also a problem that the machining cost increases and the cost increases due to an increase in the number of machining sites.

  Further, the outer peripheral portions of the diaphragm 3 and the drive cone 5 are fixed to the frame 7 via the edge dampers 15 and 17, but since the fixing between the frame 7 and the edge dampers 15 and 17 is rigid, the magnetic circuit 9 The unnecessary vibrations are transmitted to the diaphragm 3 and the drive cone 5 through the frame 7 and the edge dampers 15 and 17 and may affect the acoustic characteristics.

  As a problem to be solved by the present invention, a speaker device having a configuration in which a space sandwiched between a diaphragm arranged coaxially and a drive cone is a sealed space, and the voice coil is supported in a floating manner by the spring property of the gas enclosed in the sealed space. In this case, the sealed space can be easily repaired, and even if a defect that cannot be repaired occurs in the sealed space, the amount of waste can be reduced to reduce the economic loss, and the frame is a large component. The speaker can reduce the manufacturing cost of the product and reduce the cost of the product. Furthermore, the unnecessary vibration from the magnetic circuit does not affect the diaphragm, and the acoustic characteristics and the reproduction performance can be improved. Providing an apparatus and a method for manufacturing the apparatus is an example.

  The speaker device according to claim 1 includes a diaphragm, a drive cone that is disposed behind the diaphragm coaxially with the diaphragm, and an inner peripheral portion is joined and integrated with an inner peripheral portion of the diaphragm. A diaphragm supporting part for supporting the outer periphery of the diaphragm and the drive cone is provided on the front end side, and a magnetic circuit is provided on the central axis of the rear end, and the diaphragm and the drive cone A voice coil wound around a voice coil bobbin integrally joined to the inner periphery and inserted into the magnetic gap of the magnetic circuit, and forming a space sandwiched between the diaphragm and the drive cone in a sealed space; A speaker device in which a vibration system including a voice coil is suspended and supported by a spring property of gas confined in the sealed space, the tubular wall portion being inserted inside a diaphragm support portion on the frame, and the tube Wall A frame fixing portion that extends radially outward from one end of the frame and is fixed to the diaphragm support portion of the frame; and a first portion that is provided on one end side of the cylindrical wall portion and the outer peripheral portion of the diaphragm is airtightly fixed. A bracket comprising: a support portion; and a second support portion that is provided on the other end side of the cylindrical wall portion and that is airtightly fixed to an outer peripheral portion of the drive cone. A space between the diaphragm and the drive cone is defined as a sealed space, and an outer peripheral portion of the diaphragm and the drive cone is fixed to the frame via the bracket.

  The speaker device manufacturing method according to claim 6 is the speaker device manufacturing method according to claim 1, wherein the diaphragm and the drive cone are fixed to the bracket, and the diaphragm and the drive cone are fixed. A diaphragm assembly that defines an enclosed space is formed, and the diaphragm assembly is assembled to a frame that has been assembled with a magnetic circuit or the like.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a speaker device and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.
2 is a longitudinal sectional view showing the configuration of the first embodiment of the speaker device according to the present invention, FIG. 3 is an exploded sectional view for explaining a method of manufacturing the speaker device shown in FIG. 2, and FIG. It is an expanded sectional view of the principal part which shows the connection structure of the tinsel wire in the shown speaker apparatus.

  The speaker device 31 of the first embodiment is arranged on the diaphragm 3, behind the diaphragm 3 coaxially with the diaphragm 3, and with an inner peripheral portion hermetically sealed to the inner peripheral portion of the diaphragm 3. A drive cone 5 to be joined and integrated, and a diaphragm 3 and a diaphragm support portion 33a for supporting the outer periphery of the drive cone 5 are provided on the front end side, and a magnetic circuit 9 is provided on the center axis of the rear end. A frame 33; and a voice coil 13 wound around a voice coil bobbin 11 joined to and integrated with the inner periphery of the diaphragm 3 and the drive cone 5 and inserted into the magnetic gap 9a of the magnetic circuit 9. 3 and the drive cone 5 are formed in a sealed space 19, and the vibration system including the voice coil 13 is floated and supported by the spring property of the gas enclosed in the sealed space 19.

  However, in the speaker device 31 according to the present embodiment, the outer peripheral portions of the diaphragm 3 and the drive cone 5 are airtightly fixed to a bracket 35 formed of a metal plate, and are fixed to the frame 33 via the bracket 35. Yes.

  The bracket 35 includes a cylindrical wall portion 35a that is inserted inside the diaphragm support portion 33a on the frame 33, and extends radially outward from one end of the cylindrical wall portion 35a to extend the diaphragm support portion of the frame 33. A frame fixing portion 35b fixed to 33a, a first support portion 35c which is mounted on one end side of the cylindrical wall portion 35a and whose outer peripheral portion of the diaphragm 3 is fixed in an airtight manner via the edge damper 15, and a cylindrical wall And a second support portion 35d that is mounted on the other end side of the portion 35a and in which the outer peripheral portion of the drive cone 5 is airtightly fixed via the edge damper 17.

The frame fixing portion 35b is a flange portion extending radially outward from one end of the cylindrical wall portion 35a, and the surface of the frame fixing portion 35b serves as a first support portion 35c.
The cylindrical wall portion 35a of the bracket 35 defines a space sandwiched between the diaphragm 3 and the drive cone 5 in the sealed space 19, and the outer peripheral portion of the diaphragm 3 and the drive cone 5 is a frame fixing portion of the bracket 35. The frame 35b is fixed to the diaphragm 33 by fixing it to the diaphragm support portion 33a.

  The magnetic circuit 9 fixed to the rear end wall 33b of the frame 33 has the same configuration as that of the conventional speaker device shown in FIG. Between the rear end wall 33b of the frame 33 and the diaphragm support portion 33a, an opening 33c as a vent hole for releasing the back pressure of the diaphragm is appropriately provided.

  As shown in FIG. 3, the manufacturing method of the speaker device 31 according to the present embodiment fixes the diaphragm 3 and the drive cone 5 to the bracket 35 and forms a sealed space 19 between the diaphragm 3 and the drive cone 5. A defined diaphragm assembly 37 is formed.

  When the diaphragm assembly 37 is formed, as shown in FIG. 4, the tinsel wire 38 drawn out from the drive cone 5 is passed through the tinsel wire insertion hole formed in the cylindrical wall portion 35 a of the bracket 35. 35e is inserted and led out of the bracket 35. Then, the tinsel wire 38 led out of the bracket 35 is joined to an input terminal provided on the frame 33 by soldering or the like. The gap between the holes 35e for inserting the tinsel wire 38 through which the tinsel wire 38 has been inserted is sealed by application of the adhesive 40. In the case of a conductor bracket such as a bracket 35 formed of a metal plate, the wire rod 38 having an insulating coating such as a rubber coating is used so that the bracket 35 is not electrically short-circuited. To do.

  Then, the diaphragm assembly 37 formed as described above is inspected for sealing property, spring characteristics, etc. of the sealed space 19, and if it is confirmed that there is no defect, the diaphragm assembly 37 is moved to a magnetic field. The circuit 9 and the like are assembled to the frame 33 that has been assembled. When the adhesion between the drive cone 5 and the voice coil bobbin 11 in the sealed space 19 is completed, a dust cap 27 is adhered to the opening at the center of the diaphragm 3 as shown in FIG. Prevent the entry of etc.

  The mutual abutment surfaces of the frame fixing portion 35b and the diaphragm support portion 33a of the bracket 35 are bonded by applying a double-sided adhesive tape, an uncured adhesive, or the like to fix the frame 33 and the bracket 35. ing.

The packing 39 serves as a packing material for attaching the speaker to the cabinet, and also has an appearance viewed from the front. The packing 39 is a substantially C-shape that wraps the butted portion of the frame fixing portion 35b and the diaphragm support portion 33a from the outside. The airtightness of the butt portion is improved in the shape of the shape.
Further, the packing 39 is in close contact with the baffle of the speaker cabinet to improve the sealing property between the baffle and at the same time, blocks unnecessary vibration transmission between the baffle and the speaker unit.

In the speaker device 31 described above, a space sandwiched between the diaphragm 3 and the drive cone 5 arranged coaxially is used as a sealed space 19, and the voice coil 13 is floated and supported by the spring property of the gas enclosed in the sealed space 19. Therefore, it is not necessary to provide a dedicated damper for controlling the vibration of the voice coil 13 bobbin 11, the diaphragm 3 and the drive cone 5.
Therefore, the axial dimension of the speaker device 31 can be shortened by omitting a dedicated damper and its installation space, and in particular, the speaker device 31 required for an in-vehicle audio system can be thinned.

  In addition, since the drive cone 5 can use the same material as that of the diaphragm 3, the mass is lighter and mechanical fatigue is less likely to occur compared to a conventional bellows structure damper. Therefore, it is possible to realize a longer service life of the speaker device 31 and to prevent the occurrence of specific vibrations and rubbing noises that cause the sound quality to become cloudy. High-quality sound reproduction without turbidity can also be realized.

  Further, in the speaker device 31 of the present embodiment, the diaphragm 3 and the drive cone 5 are assembled to the bracket 35, so that a space sandwiched between the diaphragm 3 and the drive cone 5 is a sealed space 19. Thus, before being attached to the frame 33, the presence or absence of a defect in the sealed space 19 can be inspected. If a defect that can be repaired is detected, the repair work can be performed in a small and light state before being attached to the frame 33, so that the sealed space 19 can be easily repaired.

  Even when a defect that cannot be repaired occurs in the sealed space 19, only the diaphragm 3, the drive cone 5, and the bracket 35 can be discarded regardless of many components such as the magnetic circuit 9 incorporated in the frame 33. Therefore, it is possible to reduce the amount of waste and reduce the economic loss.

The speaker device 31 according to the present embodiment is manufactured by manufacturing the diaphragm assembly 37 and then mounting the diaphragm assembly 37 to the frame 33 in which the assembly of the magnetic circuit 9 and the like has been completed. The method can be adopted.
In the case of this manufacturing method, the diaphragm support portion 33a provided in the frame 33 is sufficient for fixing the bracket 35 of the diaphragm assembly 37, and it is necessary to equip each diaphragm individually. Absent. That is, by reducing the number of processing portions of the diaphragm support portion 33a on the frame 33, it is possible to reduce the processing cost of the frame 33, which is a large component, and to reduce the cost of the product.

  Moreover, since the installation location of the diaphragm support portion 33a is only one, the dimension between the rear end wall 33b of the frame 33 and the diaphragm support portion 33a is increased, and as a ventilation hole formed in the portion. It is possible to reduce the weight of the speaker unit by making the opening 33c have a large diameter.

  Further, in the speaker device 31 of the present embodiment, the packing 39 that urges the diaphragm support portion 33a on the frame 33 and the frame fixing portion 35b of the bracket 35 to urge each other is formed of a vibration absorbing material such as rubber. Since the vibration transmission between the frame 33 and the bracket 35 is cut off, unnecessary vibration from the magnetic circuit 9 does not affect the diaphragm, and the acoustic characteristics and reproduction performance can be improved.

FIG. 5 is a longitudinal sectional view of a second embodiment of the speaker device according to the present invention.
In the case of the speaker device 41 of the second embodiment, a highly cushioning sealing member 43 that is elastically deformed is provided at the abutting portion between the diaphragm support portion 33a on the frame 33 and the frame fixing portion 35b of the bracket 35. Intervene.
Except for the point where the seal member 43 is interposed, the configuration is the same as that of the first embodiment, and the same number is assigned to the common configuration and the description is omitted.

  In the speaker device 31 of the second embodiment, the seal member 43 interposed at the abutting portion between the diaphragm support portion 33a on the frame 33 and the frame fixing portion 35b of the bracket 35 exhibits a vibration damping effect due to the deformation thereof. Therefore, the unnecessary vibration from the magnetic circuit 9 does not affect the diaphragm, and the acoustic characteristics and reproduction performance can be improved.

FIG. 6 is a longitudinal sectional view of a third embodiment of the speaker device according to the present invention.
In the case of the speaker device 45 according to the third embodiment, an elastic seal member is used as an elastic seal member at the abutting portion of the diaphragm support portion 33a on the frame 33 and the frame fixing portion 35b of the bracket 35. Further, an O-ring 47 having a small contact area is interposed, and a portion for pressing the edge damper 15 of the packing 39 is also formed on the elastic protrusion 39b having a small contact area. The elastic protrusion 39b continues along the outer periphery of the edge damper 15 and functions like an O-ring.
By doing in this way, the effect which interrupts | blocks transmission of the unnecessary vibration between the flame | frame 33 and the bracket 35 can further improve, and an acoustic characteristic and reproduction | regeneration performance can be improved further.

FIG. 7 shows the speaker device according to the embodiment of the present invention, in which the outer periphery of the diaphragm 3 and the drive cone 5 is supported, and the space between the diaphragm 3 and the drive cone 5 is a sealed space 19. The other example of a bracket is shown.
The bracket 51 shown here is a cylindrical wall portion 51a that is inserted inside the diaphragm support portion 33a on the frame 33, and extends radially outward from one end of the cylindrical wall portion 51a. A frame fixing part 51b fixed to the diaphragm support part 33a, a first support part 51c that is mounted on one end side of the cylindrical wall part 51a and that the outer periphery of the diaphragm 3 is hermetically fixed via the edge damper 15. The second support portion 51d is provided on the other end side of the cylindrical wall portion 51a and the outer peripheral portion of the drive cone 5 is hermetically fixed via the edge damper 17, and these configurations are illustrated in FIG. This is the same as the case of the bracket 35 shown in FIG.

  The frame fixing portion 51b is a flange portion extending radially outward from one end of the cylindrical wall portion 51a, and the surface of the frame fixing portion 51b is a first support portion 51c. A space in which the cylindrical wall 51a is sandwiched between the diaphragm 3 and the drive cone 5 is defined as a sealed space 19, and the outer periphery of the diaphragm 3 and the drive cone 5 is configured to support the frame fixing portion 51b of the bracket 51 with the diaphragm support portion. The point fixed to the frame 33 by fixing to 33a is the same as that of the bracket 35 shown in FIG.

However, in the case of this bracket 51, it is not made of a metal plate but is integrally formed by injection molding of a non-conductive resin material. Further, a terminal fitting 53 for connecting the tinsel wire 38 drawn from the drive cone 5 is integrally formed with the bracket 51 by insert molding.
The terminal fitting 53 is provided so as to penetrate the second support portion 51 d of the bracket 51, and the tinsel wire 38 is connected to one end portion that protrudes into the sealed space 19, and the other end portion that protrudes to the outside of the bracket 51. Is connected to a lead wire 55. The lead wire 55 electrically connects the input terminal provided on the frame 33 and the terminal fitting 53.

  As shown in FIGS. 8 (a) and 8 (b), the bracket 51 described above has a cylindrical wall portion 51a having a slightly tapered shape, and the cross-sectional shape orthogonal to the axis is as follows. It is circular.

  In the speaker device using the bracket 51, since the terminal fitting 53 for connecting the tinsel wire 38 is provided by insert molding, the hole processing for the tinsel wire insertion is unnecessary in the bracket 51, and for the tinsel wire insertion. The process of sealing the hole is also unnecessary, and the productivity can be improved by reducing the processing steps. Furthermore, since the deterioration of the sealing performance due to the sealing failure for inserting the tinsel wire can be prevented, a stable damper performance can be ensured in the sealed space 19.

  Further, in the speaker device using the bracket 51, compared with the case where the metal bracket 35 shown in FIG. 4 is used, the bracket 51 is non-conductive and therefore has no insulating coating such as a rubber coating. Even if the wire 38 contacts the bracket 51, there is no danger of a short circuit accident, and the operation reliability can be improved.

FIGS. 9A and 9B show a structure in which the bracket formed integrally by insert molding of the non-conductive resin material shown in FIGS. 7 and 8 is further improved.
In the bracket 61 of the present embodiment, the inner peripheral surface of the cylindrical wall portion 61a inserted inside the diaphragm support portion 33a on the frame 33 has a plurality of locations in the circumferential direction as shown in FIG. The other configurations are the same as those of the bracket 51 shown in FIGS. 7 and 8, and the common configurations are denoted by the corresponding reference numerals. Thus, the description is omitted.

Both sides of the inflection point 63 are arcs 64 having an appropriate radius, and the intersections between adjacent arcs 64 are inflection points 63.
In the speaker device using the bracket 61 having such a structure, vibrations transmitted from the diaphragm 3 and the drive cone 5 to the cylindrical wall portion 61a of the bracket 61 are transmitted to a plurality of locations in the circumferential direction of the cylindrical wall portion 61a. Since the inflection point 63 to be equipped is subjected to a damping action, resonance due to standing waves in the sealed space 19 is difficult to occur, and in this respect as well, an improvement in acoustic characteristics can be expected.

  In the above embodiment, the edge damper 15 has the roll portion 15a that allows the amplitude of the diaphragm 3 attached to the front side of the diaphragm in a convex form. In addition, the edge damper 17 has a roll portion 17a that allows the amplitude of the drive cone 5 mounted in a convex shape on the rear side of the diaphragm. Although consideration is given so that the capacity of the sealed space 19 can be ensured to the maximum by setting the direction of each of the roll portions 15a and 17a, if each of the roll portions has a damper characteristic necessary for an air cushion, The directions of 15a and 17a are not limited to the above embodiment. For example, the direction of each of the roll portions 15a and 17a may be set in the opposite direction to the above embodiment.

As described above in detail, the speaker device (31, 41, 45) according to each embodiment of the present invention is arranged behind the diaphragm 3 coaxially with the diaphragm 3 and the diaphragm 3. A drive cone 5 whose inner peripheral portion is joined and integrated with the inner peripheral portion of the diaphragm 3, and a diaphragm support portion 33a that supports the outer peripheral portions of the diaphragm 3 and the drive cone 5 are provided on the front end side and the rear end. Is wound around a frame 33 on which the magnetic circuit 9 is mounted on the central axis of the motor, and a voice coil bobbin 11 joined and integrated with the inner periphery of the diaphragm 3 and the drive cone 5, and is inserted into the magnetic gap 9 a of the magnetic circuit 9. The space between the diaphragm 3 and the drive cone 5 is formed in a sealed space 19, and the vibration system including the voice coil 13 is floated and supported by the spring property of the gas enclosed in the sealed space 19. Speaker device The cylindrical wall portion (35a, 51a, 61a) inserted inside the diaphragm support portion 33a on the frame 33, and extends radially outward from one end of the cylindrical wall portion (35a, 51a, 61a). The outer periphery of the diaphragm 3 is hermetically fixed by being mounted on one end of the frame fixing part 35b and the cylindrical wall parts (35a, 51a, 61a) which are taken out and fixed to the diaphragm support part 33a of the frame 33. A first support portion (35c, 51c, 61c) and a second support portion (35d) which is mounted on the other end side of the cylindrical wall portions (35a, 51a, 61a) and the outer periphery of the drive cone 5 is fixed in an airtight manner. , 51d, 61d), and the space between the diaphragm 3 and the drive cone 5 is sealed between the cylindrical wall portions (35a, 51a, 61a) of the bracket (35, 51, 61). A space 19 is defined, and the diaphragm 3 The outer peripheral portion of the fine drive cone 5 is fixed to the frame 33 via a bracket (35,51,61).
That is, since the space between the diaphragm 3 arranged coaxially and the drive cone 5 is a sealed space 19 and the voice coil 13 is suspended and supported by the spring property of the gas enclosed in the sealed space 19, There is no need to provide a dedicated damper for controlling the vibration of the voice coil bobbin 11, the diaphragm 3 and the drive cone 5.
Therefore, the axial dimension of the speaker device can be shortened by omitting the dedicated damper and its installation space, and in particular, the speaker device that is required in an in-vehicle audio system can be thinned.
In addition, since the drive cone 5 can use the same material as that of the diaphragm 3, the mass is lighter and mechanical fatigue is less likely to occur compared to a conventional bellows structure damper. This can prevent the deterioration of the vibration damping performance and extend the service life of the speaker device. In addition, since there is no significant local deformation, there is no occurrence of singular vibration or rubbing noise that causes the sound quality to become turbid. It is also possible to achieve high-quality sound reproduction without noise.
Further, by assembling the diaphragm 3 and the drive cone 5 to the bracket (35, 51, 61), a diaphragm assembly 37 is formed in which the space sandwiched between the diaphragm 3 and the drive cone 5 is a sealed space 19, and the frame 33 Before being attached, the presence or absence of defects in the sealed space 19 can be inspected. If a defect that can be repaired is detected, the repair work can be performed in a small and light state before being attached to the frame 33, so that the sealed space 19 can be easily repaired.
Even if a defect that cannot be repaired occurs in the sealed space 19, the diaphragm, drive cone, and bracket need only be discarded regardless of many components such as a magnetic circuit incorporated in the frame 33. Economic losses can be reduced by reducing the amount of money.

In addition, in the method for manufacturing the speaker device according to each embodiment of the present invention, the diaphragm 3 and the drive cone 5 are fixed to the bracket, and the sealed space 19 is defined between the diaphragm 3 and the drive cone 5. A plate assembly 37 is formed, and the diaphragm assembly 37 is assembled to the frame 33 in which the assembly of the magnetic circuit or the like has been completed.
In the case of this manufacturing method, the diaphragm support portion 33a provided in the frame 33 is sufficient for fixing the bracket (35, 51, 61) of the diaphragm assembly 37, and is individually provided for each diaphragm. There is no need to equip. That is, by reducing the number of processing portions of the diaphragm support portion on the frame, it is possible to reduce the processing cost of the frame 33, which is a large component, and to reduce the cost of the product.

  The drive cone 5 is not limited to the shape of the above embodiment, and may be any shape as long as it transmits the drive of the voice coil 13 to the diaphragm 3.

It is a longitudinal cross-sectional view which shows the structure of the speaker apparatus which the present applicant previously proposed. 1 is a longitudinal sectional view showing the configuration of a first embodiment of a speaker device according to the present invention. FIG. 4 is an exploded cross-sectional view illustrating a method for manufacturing the speaker device shown in FIG. It is an expanded sectional view of the principal part which shows the connection structure of the tinsel wire in the speaker apparatus shown in FIG. It is a longitudinal cross-sectional view which shows the structure of 2nd Embodiment of the speaker apparatus based on this invention. It is a longitudinal cross-sectional view which shows the structure of 3rd Embodiment of the speaker apparatus based on this invention. It is an expanded sectional view of the principal part which shows the connection structure of the tinsel wire in the other example of the bracket of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing of the bracket shown in FIG. 7, (a) is a front view, (b) is AA sectional drawing of (a). FIG. 9 shows a structure obtained by further improving the bracket shown in FIG. 8, wherein (a) is a front view and (b) is an AA cross-sectional view of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Diaphragm 5 Drive cone 9 Magnetic circuit 9a Magnetic gap 11 Voice coil bobbin 13 Voice coil 15 Edge damper 15a Roll part 17 Edge damper 17a Roll part 19 Sealed space 31, 41, 45 Speaker apparatus 33 Frame 33a Diaphragm support part 33b Rear end wall 33c Openings 35, 51, 61 Brackets 35a, 51a, 61a Cylindrical wall portions 35b, 51b, 61b Frame fixing portions 35c, 51c, 61c First support portions 35d, 51d, 61d Second support portions 35e Holes for tinsel wire insertion 37 Diaphragm assembly 38 Kinshi wire 40 Adhesive 39 Packing 39b Elastic projection 43 Seal member 47 O-ring 53 Terminal fitting 55 Lead wire 63 Inflection point 64 Arc

Claims (6)

A diaphragm, a drive cone disposed coaxially with the diaphragm behind the diaphragm and having an inner peripheral portion joined and integrated with an inner peripheral portion of the diaphragm, and outer peripheries of the diaphragm and the drive cone A frame supporting portion is provided on the front end side and a frame is provided with a magnetic circuit on the central axis of the rear end, and a voice joined and integrated to the inner peripheral portion of the diaphragm and the drive cone. And a voice coil wound around a coil bobbin and inserted through the magnetic gap of the magnetic circuit, and a space sandwiched between the diaphragm and the drive cone is formed in a sealed space, and the gas spring property sealed in the sealed space Is a speaker device that floats and supports a vibration system including a voice coil,
A cylindrical wall portion that is inserted inside the diaphragm support portion on the frame; a frame fixing portion that extends radially outward from one end of the cylindrical wall portion and is fixed to the diaphragm support portion of the frame; A first support part mounted on one end side of the cylindrical wall part and the outer peripheral part of the diaphragm being hermetically fixed, and an outer peripheral part of the drive cone mounted on the other end side of the cylindrical wall part A second support portion that is hermetically fixed, and a bracket including:
The cylindrical wall portion of the bracket defines a space sandwiched between the diaphragm and the drive cone as a sealed space, and the outer peripheral portion of the diaphragm and the drive cone is fixed to the frame via the bracket. A speaker device.   2. The speaker device according to claim 1, wherein an elastically deformable seal member is interposed at a butting portion between the diaphragm support portion on the frame and the frame fixing portion of the bracket.   The speaker device according to claim 1 or 2, wherein a packing for abutting and urging the diaphragm support portion on the frame and the frame fixing portion of the bracket is formed of a vibration absorbing material.   4. The speaker device according to claim 1, wherein the bracket is integrally formed by injection molding of a non-conductive resin material, and a terminal fitting for connecting the tinsel wire is integrally formed by insert molding.   The speaker device according to any one of claims 1 to 4, wherein the cylindrical wall portion of the bracket is formed in a non-circular cross section having inflection points at a plurality of locations in a circumferential direction.   6. The method of manufacturing a speaker device according to claim 1, wherein a diaphragm and a drive cone are fixed to the bracket, and a diaphragm space is defined between the diaphragm and the drive cone. A method of manufacturing a speaker device, comprising: forming and assembling the diaphragm assembly on a frame that has been assembled with a magnetic circuit or the like.

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