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, ■ Speaker Speaker door · □, 52. ,. 'II' :, 1: o special, effect, application number 45774715 · Ken,
', □, □ l □,,', ,,,,,, Shi application application 45 (, 1, 970) August 21st, .. :: 0 Inventors Yoshihiko
Kakiuchi. , '::-:: ,,,,, Kadoma City Oji Kadoma 1006 Matsushita Electric Industrial Co., Ltd. ■,
Industrial Co., Ltd. ■ Applicant Matsushita Electric Industrial Co., Ltd. Kadoma City Oji Kadoma
1006 [phase] agent patent attorney Nakao Toshio One other person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a general
loudspeaker, FIGS. 2 and 3 are cross-sectional views of the main parts of a diaphragm in a
conventional loudspeaker, and FIG. 4 shows an embodiment of the loudspeaker of the present
invention It is principal part sectional drawing.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a
free-edge-type diaphragm, and it is an object of the present invention to measure the safety of
bonding of the diaphragm and to improve the safety and reliability as a speaker. In general, the
speaker is configured as shown in FIG. What is shown in FIG. 1 is an internal magnet type
speaker. A magnet 2 is attached to the inside of the yoke 1 and a center pole 3 is attached on the
magnet 2 to form a magnetic field portion. Further, the center pole 3 is configured to be
positioned at the center of the opening 5 of the upper surface of the yoke 1 by the center holder
4. A frame 6 is fixed to the upper surface of the yoke 1, and a free-edge diaphragm 8 is attached
to the peripheral edge of the frame 6 together with an arrowhead 7. A voice coil 9 is suspended
at the center of the diaphragm 8. The speaker 10 thus configured to be properly positioned in
the magnetic gap 11 formed between the damper 10 (the end face of the opening of the center
pole 3 and the yoke 1 in this way, the characteristic that significantly affects the vibration It is a
board 8. Generally, as the diaphragm 8, for high output, a 9-edge type is used. A conventional
free-edge diaphragm is configured as shown in FIG. 2 and p. An edge portion 14 is adhered to the
peripheral edge portion of the cone portion 12 by an adhesive 13 and an edge paint 15 is
applied to the edge portion 14. In the diaphragm configured as described above, the edge portion
14 is formed by impregnating a cotton or silk cloth with a resin solution such as melasin, phenol,
or urea to form a heat-forming corrugation portion 16. Ru. Further, as the adhesive 13, a nitrile
rubber or a chloroprene adhesive is used. Cage, edge paint 15 applied to the edge portion 14 is
used to control the reflection vibration wave from the sealing of the edge portion or the edge
portion, and to improve the frequency characteristic, and use cellulose nitrate, cellulose acetate,
vinyl. A solution of about 50 to 80 solid parts in which a plasticizer is blended in a system,
rubber or methacrylic resin is used. As the above-mentioned plasticizer, dibutyl phthalate, dioctyl
phthalate, tricresyl phosphate, todioctyl phosphate, dioctyl azidate and the like are used. These
plasticizers are transferable to chloroprene, nididyl rubber, vinyl acetate, and vinyl chloride
adhesives, and in particular when used in close proximity to the bonding area as in the edge of a
speaker, the plasticizer is cloth or paper. It penetrates into and gradually migrates.
In particular, the higher the ambient temperature and humidity, the faster the transition speed.
FIG. 3 shows the operating state of the diaphragm, and when the cone 12 is moving downward,
the plasticizer tends to flow and migration is promoted. The migration of the plasticizer causes
the adhesive 13 to deteriorate to cause the debonding (consequence). In this case, the generation
of abnormal sound as a speaker and the occurrence of an end page: 1 or the like occur, and
finally, there is a major drawback that the speaker becomes completely useless. The present
invention eliminates the above-mentioned conventional drawbacks. That is, according to the
present invention, as shown in FIG. 4, the water-soluble paraffin layer ′ ′ ′ is adhered
between the adhesion portion of the cone portion 17 and the edge portion 1B with the adhesive
19 and the edge paint 21 applied to the corrugation 20 of the edge portion 18 The diaphragm
using □□ 22; is used. □ :: '-,' 1 This water-soluble paraffin i is water-repellent, so that the
plasticizer contained in the paint 1 '111-1. L: Tsuji paint 21 prevents the adhesive 19 parts
transfer-□-Takeko I'm off the nature. □ As a method of forming the permanently soluble
paraffin layer 22, at the time of molding the edge portion 18, water-soluble paraffin is applied to
the cloth and the corrugation portion 20 of the edge portion 18 is molded simultaneously with
heating and pressing. Can be formed. It can also be formed by applying water-soluble paraffin
with a brush or the like and drying it. Furthermore, it is necessary to be careful when applying
water-soluble paraffin to form a layer □ 1 1 □ 1 ', that the paraffin flows and adhesive 19 parts
(this film is formed, Since paraffin is a kind of mold release agent, it degrades the adhesion effect.
As described above, the speaker according to the present invention is a vibration coupled to the
frame coupled to the field part, in which the water-soluble paraffin layer is formed between the
adhesion part of the cone part and the edge part and the edge paint applied to the edge. Since
the plate is attached and the voice coil is suspended from this diaphragm, the edge paint (the
plasticizer contained in this moves to the bonded portion between the cone and the edge and the
adhesion is deteriorated, and the edge and the cone are lowered. There is no need to exfoliate at
all, it can be made to have stable characteristics, it can be made to be high quality and reliable,
and it has great industrial value.
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