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JPS61242197

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DESCRIPTION JPS61242197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a flat diaphragm of a flat speaker used for various acoustic devices.
(Prior Art) In general, a flat loudspeaker is configured as shown in FIG. That is, in the flat panel
speaker, the single ring magnet 2 and the ring top plate 3 are stacked on the bottom plate 1
having the center pole 1 a, and the frame 5 is fixed on the magnetic circuit 4 configured by
combining these. An edge 10 such as a free edge fixed to the peripheral edge of the flat
diaphragm 9 to which the drive cone 8 coupled to the voice coil 7 inserted into the magnetic gap
6 of the magnetic circuit 4 is attached is a peripheral edge of the frame 5 The voice coil 7 is held
by a damper 12 fixed to the inner wall of the frame 5 with the gasket 11. Conventionally, as a
diaphragm of this type of flat-plate speaker, a flat-plate diaphragm in which an aluminum skin
material is adhered to both surfaces of a core material of a honeycomb structure is used. A
method of manufacturing such a flat diaphragm will be described with reference to FIG. In the
figure, skin materials 14 and 15 formed by laminating thermoplastic films are laminated on the
upper and lower surfaces of the core material 13 of the diaphragm, and aluminum or the like is
used to obtain the core and skin mutual positioning and the flatness of the diaphragm. After
holding it between bonding jigs 16 and 17 consisting of metal plates, place it between upper and
lower press dies 18 and 19 heated to a predetermined temperature by force 1, and place upper
press die 18 in the direction of movement shown by arrow A. Press down and press for a
predetermined time ・ At this time, the upper and lower press dies 18 and 19 melt the film by
making its temperature above the melting point of the thermoplastic film, and the skin materials
14 and 15 on which it is laminated are It adheres to the upper and lower sides of core material
13, respectively. (Problems to be Solved by the Invention) However, in the method of
manufacturing the flat diaphragm as described above, when bonding the core material 13 and
the skin materials 14 and 15, the bonding jigs 16 and 17 may be thermally expanded or
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pressurized. The adhesion strength between the core material 13 and the skin materials 14 and
15 was not constant and weak because of the deformation or warpage caused by the above. For
this reason, there is a problem that the sound pressure frequency characteristic is not flat when
incorporated in the speaker, and the high frequency reproduction frequency is also lowered.
(Means for Solving the Problems) In order to solve the problems, the present invention is a
pressing step of bonding the skin materials 14 and 15 on both sides of the core material 13, and
the skin materials 14 and 15 and the bonding jig 16 And 17 sandwich a fluorocarbon resin
sheet.
A fluorine resin-based sheet with an adhesive is inserted between the lower bonding jig 17 and
the skin material 15. (Operation) The slight warpage and deformation of the bonding jig caused
by heating and pressure are absorbed by the fluorocarbon resin sheet inserted between the
bonding jig and the skin material, and the bonding strength between the core material and the
skin material is It is uniformed over the entire surface. Furthermore, since the lower adhesive jig
uses a thick adhesive-coated fluororesin sheet, a large pressing pressure is applied between the
core material and the lower skin material at the time of pressing, and the adhesive strength is
enhanced. Thus, the adhesive strength of the diaphragm is increased, and the high frequency
reproduction frequency can be extended without losing the appearance quality. One embodiment
of the present invention will be described with reference to FIG. A 20 μm thick aluminum skins
14 and 15 having a thermoplastic film adhered with a urethane adhesive are laminated on both
sides of the honeycomb core 13 made of aluminum, with the film surfaces facing the above core
13. The adhesive sheet 17 is attached on the lower adhesive jig 17 to which a pressure-sensitive
adhesive-containing fluororesin sheet 20 having a thickness of about 40 μm is adhered
beforehand, and a 20 μm-thick fluororesin sheet 21 is placed on the aluminum skin material 14
above. Then place the upper bonding jig 16 on it and place it between the upper and lower press
dies 18 and 19 heated to a temperature of about 200 ° C. 1 Next, push the upper press die 18
in the direction of arrow A to Press for 20 seconds. The heat of the upper and lower press dies
18 and 19 respectively adheres to the upper and lower bonding jigs 16 and 17. Since the heat is
transmitted to the skins 14 and 15 through the fluororesin sheets 21 and 20 and the
temperature exceeds the melting point of the above-mentioned thermoplastic film, the core 13
and the skins 14 and 15 are bonded. By making the height of the guide portion of the bonding jig
16 equal to the thickness of the core material 13, the thickness of the skin materials 14 and 15
bite into the fluororesin sheets 21 and 20, respectively, and the bonding jig and the skin material
The gap between the skin material and the core material can be filled due to the slight gap
between it and the warp due to heating and adhesion of the bonding jig, and the gap due to
deformation, etc., and the biting into the fluororesin sheet. In particular, since the pressuresensitive adhesive-coated fluorine resin-based sheet 20 is used for the lower skin material 15, the
sheet is thick and accordingly the amount of biting is large, and the adhesive strength of the
diaphragm is not deteriorated Can raise (Effects of the Invention) As described above, according
to the method of manufacturing a flat plate diaphragm of the present invention, the bonding
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strength of the diaphragm can be easily improved and made uniform without lowering the
appearance quality, and the flat surface is flat. Thus, it is possible to obtain a flat diaphragm for a
speaker having good sound pressure frequency characteristics and a wide high frequency
reproduction frequency.
Although the voice coil 7 and the flat diaphragm 9 are coupled via the drive cone 8 shown in FIG.
2 as an example of the flat loudspeaker, the voice coil may be directly coupled to the flat
diaphragm. The present invention can achieve the same effect.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a material and a tool showing a method of manufacturing a flat
plate diaphragm according to the present invention, FIG. 2 is a cross-sectional view of a flat plate
speaker, and FIG. 3 is a material and a tool showing a method of manufacturing a conventional
flat plate diaphragm. FIG.
DESCRIPTION OF SYMBOLS 1 ... Bottom plate, 1a ... Center pole, 2 ... Annular magnet, 3 ... Top
plate, 4 ... Magnetic circuit, 5 ... Frame, 6 ... Magnetic gap, 7 · · Voice coil. DESCRIPTION OF
SYMBOLS 8 ... Drive cone, 9 ... Flat-plate diaphragm, 10 ... Edge, 11 ... Gasket, 12 ... Damper, 13 ...
Core material, 14.15 ... Skin material, 16 , 17: bonding jig, 18.19: press die, 20: fluorocarbon
resin sheet, 21: fluorocarbon resin sheet with adhesive. Patent Applicant Matsushita Electric
Industrial Co., Ltd. Figure 1 Figure 2
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