Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JP2011004308 To provide a thin speaker device capable of large input. A diaphragm is a flat plate, and a cylindrical portion positioned outside a magnetic circuit provided inside a frame is integrally formed on the back surface of the diaphragm. The cylindrical portion was connected to the voice coil, and radial ribs were integrally formed on the back surface of the flat plate diaphragm at an outer position of the cylindrical portion to achieve rigidity. The center cap was attached to the front of the flat diaphragm, which also increased the rigidity of the flat diaphragm. The damper was provided outside the cylindrical portion so as not to interfere mechanically with the magnetic circuit. This damper was disposed on substantially the same plane as the substantially central portion of the voice coil winding portion. In addition, a heat dissipation hole was formed in the cylindrical portion and the frame to dissipate heat of the voice coil, and a window was formed to improve heat dissipation. [Selected figure] Figure 1 Speaker device [0001] The present invention relates to a thin speaker device used for, for example, various AV devices and the like. [0002] FIG. 7 shows a speaker device generally used conventionally. 11-05-2019 1 In the figure, reference numeral 100 denotes an inner magnet type magnetic circuit, which comprises a yoke 101, a magnet 102 and a plate 103, and a magnetic gap is formed between the outer peripheral surface of the plate 103 and the yoke inner peripheral wall 101a opposed thereto. [0003] The voice coil winding portion 104 a of the voice coil 104 is located in the magnetic gap. [0004] The inner periphery of the damper 105 is bonded to the upper outer periphery of the voice coil 104, and the outer periphery of the damper 105 is bonded to the step 106a of the frame 106. The lower part of the frame 106 is joined on the top surface 101b of the yoke upper part, and the outer peripheral part of the edge 107 is bonded to the upper part of the frame 106, and the outer peripheral part of the conical diaphragm 108 is bonded to the inner peripheral part of the edge 107 The inner peripheral side of the diaphragm 108 is bonded to the upper outer peripheral portion of the voice coil 104. Reference numeral 109 denotes a center cap provided at the center of the diaphragm 108. [0005] In operation, when an audio signal is input to the voice coil winding portion 104 a in the magnetic gap, the voice coil 104 vibrates and, consequently, the diaphragm 108 vibrates. At this time, the damper 105 also vibrates. [0006] In this case, sufficient between the damper 105 and the yoke upper surface of the magnetic circuit 100 to avoid mechanical interference that the damper 105 may come in contact with the upper surface of the top surface 101b of the yoke 101 or the lower part of the frame at large input. Since it is necessary to provide the clearance a, this has been an obstacle to thinning. [0007] 11-05-2019 2 FIG. 8 shows a conventional example of a speaker of the type in which the magnetic circuit is provided in front of the diaphragm, and such a speaker device is disclosed in JP-A-62-136196. [0008] In this speaker device, a magnetic circuit 201 is disposed in front of a cone-shaped diaphragm 200. The inner periphery of the diaphragm 200 is bonded to the lower portion of the voice coil 202, and the voice coil winding portion 202a located in the magnetic gap is disposed above the voice coil 202, and the voice coil 202 is disposed below the diaphragm 200. It is vibratably supported via the provided damper 203. [0009] In this speaker device, it is necessary to secure a distance b between the diaphragm 200 and the lower portion of the yoke 204 of the magnetic circuit 201. [0010] FIG. 9 shows a conventional speaker device in which the inner diameter of the diaphragm 300 is larger than that of the magnetic circuit 301 and the position of the damper 302 is substantially equal to the position of the upper portion of the yoke 303 of the magnetic circuit 301. Opening 2002-271893 is mentioned. [0011] That is, the magnetic circuit 301 is provided at the center of the bottom of the frame 304, and the damper 302 is positioned at substantially the center of the frame 304. The damper 302 is positioned outside the yoke of the magnetic circuit 301, the inner peripheral portion of the damper 302 and the neck portion of the conical diaphragm 300 are bonded to the lower portion of the outer periphery of the connecting portion 305, and the inner peripheral portion of the connecting portion 305 is a voice. A voice coil winding portion 306 a is provided on the lower outer periphery side of the voice coil 306 and is adhered to the upper portion of the 11-05-2019 3 coil 306. [0012] FIG. 10 also shows another conventional example of the speaker apparatus in which the position of the damper 400 is substantially the same position as the upper portion of the yoke 402 of the magnetic circuit 401. As this speaker apparatus, JP-A-2005-269328 can be mentioned. [0013] The diaphragm 403 of the speaker device has a substantially flat plate shape, but a falling portion 403 a is formed on the inner peripheral portion thereof and is bonded to the upper outer peripheral portion of the voice coil 404. [0014] The connection portion 405 provided between the damper 400 and the voice coil 404 is located below the diaphragm 403, and the inner periphery of the connection portion 405 is bonded to the upper outer periphery of the voice coil 404, and the outer periphery of the connection portion 405 Is located on the upper side of the yoke 402, and the inner peripheral portion of the damper 400 is bonded. [0015] JP-A-62-136196 JP-A-2002-271893 JP-A-2005-269328 [0016] The general speaker device shown in FIG. 7 has a limitation in thinning since it is necessary to take a clearance a between the damper 105 and the upper surface of the yoke inner peripheral wall 101a of the magnetic circuit 100 disposed below and spaced therefrom. There was a problem that there was. [0017] Also in the speaker apparatus of the type in which the magnetic circuit shown in FIG. 8 is provided in front of the diaphragm, the distance b between the damper 203 and the magnetic circuit 201 is large, and the damper 203 serves to maintain the voice coil winding portion 202a at the center. , And rolling defects are likely to occur, and it is necessary to widen the magnetic gap. 11-05-2019 4 [0018] In the speaker apparatus of the type in which the diaphragm 300 having a larger inside diameter than the magnetic circuit 301 shown in FIG. 9 is used and the damper 302 supporting the diaphragm 300 is disposed above the magnetic circuit 301, Since the connection portion 305 is provided between the voice coil 306 and the voice coil 306 inside the connection portion 305, there is a problem that the heat dissipation path can not be secured by the connection portion 305, and the input can not be large. [0019] In the conventional example of FIG. 10, the falling portion 403a is formed on the inner peripheral portion of the diaphragm 403, and the portion is bonded to the upper outer peripheral portion of the voice coil 404, and the connecting portion 405 is also bonded. In the case of the substantially flat diaphragm 403, sufficient shape rigidity can not be obtained, and there is a problem that it is difficult to obtain a large input. [0020] The present invention has been proposed to solve the above problems, and the shape rigidity of the diaphragm is enhanced, and the arrangement of the dampers is at a position not to cause mechanical interference with the magnetic circuit, thereby making it thin while coping with a large input. The present invention is to provide a speaker device capable of achieving a large input and capable of improving the efficiency of the magnetic circuit and having a good heat dissipation because the gap length of the magnetic circuit can be made small. The purpose of [0021] In the first aspect of the present invention, the cylindrical portion 9b is integrally formed on the back surface 9a of the flat plate diaphragm 9 in which the central hole 9c is formed, and the rib 9d radially extends toward the outer peripheral portion on the outside of the cylindrical portion 9b. The magnetic circuit 2 is integrally formed at an inner position of the cylindrical portion 9b at the center of the inner bottom of the frame 1, and above the voice coil 8 where the voice coil winding portion 8a is located in the magnetic gap of the magnetic circuit 2. The inner peripheral portion of the flat plate diaphragm 9 is adhered to the outer peripheral portion, and is fitted into the tip end portion of the voice coil 8 projecting from the central hole 9 c to form a flat center cap 11 on the front surface of the flat plate diaphragm 9. The voice is attached via the cylindrical portion 9b by the damper 12 disposed outside the cylindrical portion 9b of the flat plate diaphragm 9 so that the inner diameter is larger than the magnetic circuit 2 and does not 11-05-2019 5 mechanically interfere with the magnetic circuit 2. The cylindrical portion 9b is provided with a vent hole 9e for radiating heat generated by the voice coil 8 to the outside, and a heat dissipation window for forming a heat dissipation path A together with the vent hole 9e. 7 is formed on the frame 1. According to a second aspect of the present invention, in the speaker device according to the first aspect, a plurality of the ribs 9d are formed on the outer side of the cylindrical portion 9b with an interval, and the vent holes 9e are formed between the ribs 9d. It features. The invention according to claim 3 is characterized in that in the speaker device according to claim 1, a flat plate 15 is provided on the front surface 9 h of the flat diaphragm 9. [0022] In the present invention, since the damper 12 is disposed outside the magnetic circuit 2 so that the damper 12 and the magnetic circuit 2 do not mechanically interfere with each other, there is no need to secure a clearance between the damper 12 and the magnetic circuit 2 Can be Since ribs 9d are formed at appropriate intervals on the back surface 9a of the flat diaphragm 9 and the shape rigidity of the entire surface of the diaphragm can be secured by the center cap 11, large input can be achieved. Further, the cylindrical portion 9b formed on the back surface of the flat diaphragm 9 is disposed outside the magnetic circuit 2, and the cylindrical portion 9b is formed with a vent 9e for dissipating heat from the voice coil 8 placed in the magnetic circuit 2. At the same time, the heat release window 7 corresponding to the vent hole 9e is formed in the frame 1 for supporting the flat diaphragm 9, and the first heat release path A from the vent hole 9e to the heat release window 7 is formed. Also from this point of view, a large input can be achieved. The heat release windows A and B also correspond to the pressure change inside the speaker device due to the change of the amplitude of the flat diaphragm 9. Further, since the damper 12 and the voice coil winding portion 8a are arranged substantially on 11-05-2019 6 the same plane when the damper 12 is at rest, coil touch due to rolling is hard to occur, so the gap length Lg can be shortened. And the magnetic flux density can also be improved. [0023] The longitudinal cross-sectional view of 1st Example of this invention. (A) The perspective view which looked at the diaphragm used by this invention from the front side, (b) The perspective view which looked at the diaphragm same as the same from the back side. Partial-section explanatory drawing of the magnetic circuit of this invention. Assembly explanatory drawing of 1st Example of this invention. Explanatory drawing of the completion state of the assembly same as the above. The longitudinal cross-sectional view of 2nd Example of this invention. The longitudinal crosssectional view of the conventional general speaker apparatus. The longitudinal cross-sectional view of the conventional speaker apparatus of the type in which the magnetic circuit was provided ahead of the diaphragm. The longitudinal cross-sectional view of the speaker apparatus of another prior art example. The longitudinal cross-sectional view of the speaker apparatus of another prior art example is shown. [0024] In the present invention, the damper is provided at a position not mechanically interfering with the magnetic circuit, that is, outside the magnetic circuit, and the damper and the voice coil winding portion placed in the magnetic gap of the magnetic circuit are disposed substantially on the same plane. did. Radial ribs were provided on the back of the flat diaphragm driven by the voice coil, and a center cap was attached to improve the shape rigidity of the flat diaphragm. In addition, a heat dissipation path for heat generation of the voice coil to be dissipated to the 11-05-2019 7 outside was formed quickly, and the position of the damper and the shape rigidity of the flat diaphragm were improved, and the heat dissipation was good, achieving thinning and large input. [0025] FIG. 1 shows a first embodiment of a speaker device according to the present invention. [0026] A magnetic circuit 2 is provided on the lower surface 1 a in the frame 1. A cylindrical first peripheral wall 1b is formed on the outer periphery of the lower surface 1a of the frame 1 and is formed to rise upward, and the upper portion of the first peripheral wall 1b is bent outward and has a stepped shape for mounting a damper A stepped portion 1c is formed, an outer peripheral portion of the stepped portion 1c is raised, and a second peripheral wall 1d is formed, and an upper end thereof is an edge attaching portion 1e bent outward. A first heat radiation window 6 for heat radiation is formed from the outer peripheral portion of the lower surface 1a to the first peripheral wall 1b. Further, the second heat radiation window 7 for heat radiation is also formed from the outer peripheral side of the step portion 1c for mounting the damper to the second peripheral wall 1d. [0027] The magnetic circuit 2 includes a cylindrical yoke 3 with a bottom, a magnet 4 provided inside the yoke 3, and a plate 5 provided on the top of the magnet 4, and the outer peripheral surface of the plate and the yoke peripheral wall 3a opposed thereto A magnetic gap g is formed on the inner circumferential surface of [0028] The voice coil winding portion 8a is disposed in the magnetic gap g. The inner peripheral surface of the flat diaphragm 9 is bonded to the upper outer peripheral surface of the voice coil 8. One end of an edge 10 is bonded to the outer peripheral portion of the 11-05-2019 8 back surface 9 a of the flat diaphragm 9, and the other end of the edge 10 is bonded to an edge attaching portion 1 e of the frame 1. A flat plate-shaped center cap 11 is provided on the central hole 9 c of the flat plate diaphragm 9 and on the outer peripheral portion thereof on the flat plate front surface 9 h. The outer diameter of the center cap 11 is equal to or slightly larger than the inner diameter of the damper 12. When the outer diameter of the center cap 11 is larger than the inner diameter of the damper 12, the drivability can be improved. That is, since the portion of the flat diaphragm 9 inside the inner diameter (≒ diameter of the cylindrical portion 9b) of the damper 12 is not reinforced by the rib 9d, the strength is weak and it is easy to bend particularly in the vicinity of the hole 9f. The strength of the cap 11 compensates. Thus, the drivability is improved. A step is formed on the back of the center cap 11 to be fitted on the outer periphery of the tip of the voice coil 8 protruding upward from the central hole 9c of the flat diaphragm 9, and the voice coil tip protruding from this standing portion The center cap 11 is fitted and positioned and attached to the front surface 9 h of the flat plate diaphragm, and this portion is adhered as described later to secure the adhesive strength and to prevent the neck loss at the time of large input. [0029] On the back surface 9a of the flat diaphragm 9, a cylindrical portion 9b located outside the yoke peripheral wall 3a is formed. The lower portion of the cylindrical portion 9b is divided from the viewpoint of assemblability. This will be explained later. From the outer peripheral surface of the cylindrical portion 9b to the back surface 9a of the flat plate diaphragm 9, the longitudinal cross section has a substantially right-angled triangle shape, and ribs 9d extending radially outward from the inner part of the flat plate diaphragm 9 are formed. The top of the flat plate is located on the outer peripheral side of the flat plate back surface 9a. In the figure, 9f is a hole formed in the portion of the cylindrical portion 9b of the flat diaphragm 9. This hole 9f may not be present. The holes 9f are provided for manufacturing reasons. That is, in the case of injection molding with a mold, if there is no hole 9f, it becomes an undercut and it is necessary to provide a slide in the mold, and the mold structure becomes complicated, so that the cost for forming becomes high and the life becomes short. There are holes 9f for such manufacturing reasons. [0030] Further, the cylindrical portion 9b is formed with a vent hole 9e for releasing the heat generation of the voice coil 8 to the outside. [0031] 11-05-2019 9 FIG. 2A is a perspective view of the front surface side of the flat plate diaphragm 9 having a substantially circular outer shape, and at the upper end portion of the cylindrical portion 9b, the above-mentioned Holes 9f are formed. FIG. 2B is a perspective view of the flat diaphragm 9 as viewed from the back side. Depending on the size of the flat diaphragm 9, 6 to 20, preferably 16 ribs 9d are formed at equal intervals along the circumferential direction. If the number of ribs 9d is 6 or less, the strength is insufficient, and if it is 20 or more, the weight increases. These ribs 9d, together with the center cap 11, improve the shape rigidity of the entire surface of the flat diaphragm 9, and play a role of large input. Further, vent holes 9e are respectively formed between the rib 9d and the rib 9d formed in the cylindrical portion 9b. The hole 9 f is closed by the center cap 11. This is to prevent air noise due to a pressure change on the rear side of the speaker and to suppress a reduction in strength due to the hole 9 f. [0032] Referring again to FIG. 1, a damper mounting portion 9 g is formed on the lower outer peripheral portion of the cylindrical portion 9 b formed on the back surface 9 a of the flat plate diaphragm 9, and the inner peripheral portion of the damper 12 is mounted. The outer peripheral portion of the damper 12 is attached to a damper mounting step 1 c formed on the frame 1. [0033] The damper 12 is positioned approximately at the center of the voice coil winding portion 8a when the voice coil 8 is at rest, ie before vibration. In other words, the substantially central portions of the damper 12 and the voice coil winding portion 8a are disposed on substantially the same plane. That is, the damper mounting portion 9g and the upper surface of the step portion 1c are provided at substantially the same position and at the outer position of the upper outer periphery of the yoke, and the damper 12 is outside the magnetic circuit 2 and the magnetic circuit is vibrated. The first space portion 13 and the second space portion 14 are formed on the front and rear surfaces of the damper 12 to ensure maximum amplitude. [0034] By arranging the damper 12 in this manner, the speaker device can be thinned. 11-05-2019 10 [0035] Further, by arranging the damper 12 and the substantially central portion of the voice coil winding portion 8a on substantially the same plane, it is difficult to generate a coil touch due to rolling, so the gap length Lg shown in FIG. 3 can be reduced. And the magnetic flux density can also be improved. [0036] When the voice coil is driven, the heat generation of the voice coil 8 can be quickly dissipated to the outside air of the back side of the speaker device through the vent hole 9e formed in the cylindrical portion 9b and the second heat release window 7. A is its first heat radiation path. In this case, heat is also dissipated through the first heat dissipation window 6. B is the second heat radiation path. When the first and second heat radiation paths A and B are formed as described above, the heat radiation property is further improved. Further, the heat in the voice coil 8 can be dissipated to the outside through the heat dissipation hole 8b formed in the voice coil 8, the vent hole 9e of the cylindrical portion 9b, the second heat dissipation window 7 and the like. [0037] FIG. 4 shows a second embodiment of the present invention. This embodiment is different from the first embodiment in that a thin flat plate 15 for increasing rigidity is attached to the front surface of the flat plate diaphragm 9 to further improve the shape rigidity. Other configurations and effects are similar. [0038] In assembly, as shown in FIG. 4, the magnetic circuit 2 is attached to the frame 1 via the jig A. 11-05-2019 11 Thereafter, the jig A is removed. [0039] Also, using a jig (not shown), the voice coil 8 is disposed at an appropriate position in the magnetic gap g. [0040] The lower portion 9b 'of the cylindrical portion 9b of the flat plate diaphragm 9 is initially separated in consideration of assemblability. [0041] The inner peripheral portion of the damper 12 is attached to the outer peripheral step portion (damper inner peripheral mounting portion) of the substantially cylindrical lower portion 9 b ′ separated, and the outer peripheral portion of the damper 12 is attached to the damper mounting step portion 1 c of the frame 1 Be glued. [0042] Further, an adhesive (not shown) is applied to the upper surface 9 b ′ ′ of the lower portion 9 b ′ separated, and as shown in FIG. 5, it is adhered to the lower surface of the cylindrical portion 9 b on the flat diaphragm 9 side. [0043] Further, the outer peripheral portion of the voice coil 8 is bonded to the inner peripheral portion of the flat diaphragm 9. [0044] Since the inner peripheral portion of the edge 10 is bonded to the outer peripheral portion of the flat diaphragm 9, the outer peripheral portion of the edge 10 is bonded to the edge mounting portion 1 e of the frame 1. [0045] Next, the center cap 11 is placed on and bonded to the substantially central portion of the front 11-05-2019 12 surface of the flat diaphragm 9. In this case, the upper outer peripheral portion of the voice coil 8 projecting forward from the upper surface of the flat plate diaphragm 9 is bonded to the inner peripheral surface of the step 11 a on the inner surface of the center cap 11. If the rib-like cylindrical portion 9b is provided on the inner side of the inner diameter of the damper on the back surface side of the flat plate diaphragm 9 to interfere with the magnetic circuit 2, the height dimension can not be obtained. Since there is a height dimension which is wasted because of the protrusion of the upper part of the upper part, the step part 11b is formed on the back of the flat plate diaphragm 9 by effectively using that part, and it adheres to the voice coil 8 And, it is considered as a countermeasure against the head loss at the time of large input. [0046] DESCRIPTION OF SYMBOLS 1 frame 1a lower surface 1b first peripheral wall 1c stepped portion 1d second peripheral wall 1e edge mounting portion 2 magnetic circuit 3 yoke 3a yoke peripheral wall 4 magnet 5 plate 6 first heat dissipation window 7 second heat dissipation window 8 voice coil 8a voice Coil winding 9 flat plate diaphragm 9a flat plate diaphragm back 9b cylindrical portion 9c central hole 9d rib 9e air vent 9f hole 9g damper mounting portion 9h flat plate diaphragm front 10 edge 11 center cap 12 damper 13 first space portion 14 Space part of 2 11-05-2019 13
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