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l + Patent head '1 number speaker horn manufacturing method name + 027) Onkyo Co., Ltd.
Representative director Takeshiro Onkyo Co., Ltd. stock 5,' s · f 'Jil + Wi inventory [phase] Japan
Patent Office 0 JP 51-842450 Published by Nikkei 51. (1976) 7.23 Office internal reference
number 64-6555 specification or name of invention
Speaker horn manufacturing method
3. A detailed description of the present invention The present invention relates to a method of
manufacturing a speaker horn characterized in that a flexible material is used as a framework
substrate, and its outer shape is solidified with a rigid material to form the same. Conventional
speaker horns are often made of cast metal alone. Therefore, sand molds used for casting were
manufactured at every casting, and after casting they had to be broken at the time of removal,
which was the main cause of the high cost of the horn. In addition, it was difficult to partially
change the state because of its integral structure. The method of manufacturing the speaker horn
according to the present invention is as follows: ### 2 tight. When the raw material of the
synthetic resin material to be treated 4 is injected into the molds 1 and 2 and heated and reacted,
the resin foams and forms open cells. At temperature or normal temperature, the material
becomes a flexible body 3 with a high degree of elasticity, so it can be easily pulled out of the
gold gl 2 as it is without disassembling or destroying the molds 1 2. Further, in the case of a
material such as rubber which completes crosslinking and loses plasticity by heating, it can be
pulled out directly from the molds 1 and 2. In any case, the hardness of the material is desirable
because it is as hard as possible within the range that can be drawn out or the ease of handling in
the subsequent steps. As described above, according to the manufacturing method of the present
invention, since the material substrate 3 is rich in elasticity, a horn of a sectoral type,
multicellular type, or a horn shaped to have a plurality of outwardly convex surfaces 4. However,
the advantage is great that the material substrate 3 can be pulled out with the gold-fi 1 and 2 as
it is. Thus, in the step of curing the foamed EndPage: 1 powder 3 taken out of the molds 1 and 2
as the skeleton, in the case of the foamed urethane, a thermosetting resin such as polyester-still
or epoxy. Mix the nitrifying agent into 5 and impregnate, solidify and shape it. In the case of
rubber, if it is impregnated with a thermosetting resin such as melamine or phenol, the cost can
be reduced and the processing process can be shortened. Therefore, in the case of any of the
above-mentioned foam substrates 3, immediately after the molds 1 and 2 are formed and taken
out, the outer coating is formed on the entire surface in contact with the molds 1 and 2, so The
membrane is broken in several places to expose the foam and post impregnation. Because it is an
open cell, it is extremely easy to impregnate and complete in a short time. The metal fittings 6
etc. necessary for the use of speakers can be easily inserted by attaching them to the foam base
prior to the impregnation process, and by removing the bonding with the driver unit, female
post-impregnation after impregnation becomes unnecessary. Help to reduce costs.
Further, by reducing the degree of impregnation of the vicinity of the opening 8 of the horn and
leaving the bubble portion (9), the acoustic loss is kept when using as a speaker horn, and the
acoustic radiation characteristics by the acoustic reflection from the opening 8 Can be
significantly reduced. Such partial change of the state of the horn can also be realized quite
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a speaker horn
manufactured according to the present invention, and FIG. 2 is a sectional view of a mold.
Reference numeral 2 denotes a molding die, 3 a flexible material substrate, and 45 a hard
material. □, Yuka vm & w 711 City 7 Y also, Y,-7 ′ ′ Onkyo Co., Ltd. Egitarou Name 口
EndPage: 2
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