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Patent Secretary, Hideo Saito, Meguro-ku, Tokyo-Miguro 1-chome, No. 4-1, (501)-Pioneer
Corporation [Fa] Japan Patent Office ■ Japanese Patent Application No. Method of
manufacturing horn speaker Prepare a core assembly in which fins are embedded so that upper
and lower ridges project by a predetermined length, and using this core assembly, the projection
of the above-mentioned fins is embedded in the thickness A method of manufacturing a horn
speaker, comprising casting the main body to
2 Claims
3 Detailed Description of the Invention The invention 'relates to a method of manufacturing a
horn-type speaker in combination with a driver unit. Among horns, those mainly used for middle
or high / high pitch speakers are constituted by a main body which is gradually expanded toward
the front opening and fins for dividing the inside of the main body into a plurality of passages. Be
done. In general, such horns are manufactured by casting a metal material mainly made of light
metal such as aluminum or zinc, but can not be integrally molded due to the structure as
described above. A troublesome method is employed such as separately casting and joining in a
single house such as welding, or separately casting and assembling a main body and a fin. In
such a method, the material and shape, size, and the like used are limited, and not only the
desired dimensional accuracy can not be obtained, but also the defect such as peeling of the joint
due to mechanical or thermal attack It occurs. The present invention seeks to provide a method
for obtaining a horn speaker having a desired structure without the need for welding or adhesive
bonding. According to the method of the present invention, the fins are formed by any means
such as forging, die casting, cutting or pressing, and the fins are combined with the core in such
a state that a part thereof protrudes. The casting of the body takes place using Because of this,
the fins are fixed to the body with a part thereof intruding into the thickness of the body, and a
horn with very high strength is obtained. Hereinafter, an example of the steps of the present
invention will be described as EndPage: 1 in the drawings. FIG. 1 shows a core assembly used in
this case. The core assembly comprises a plurality of (three sheets in this example) fins l which
are formed into a predetermined bowl shape by any means such as forging, gui cast, cutting or
press, and the fins l to a predetermined positional relationship. Since the core and the lower end
of each of the fins l project from the upper and lower surfaces of the core by an appropriate
length, one core and one lower end of the fins l are removed. The whole has the same shape as
the inside of a given horn. This core assembly is used to cast the main body of the horn in the
same manner as a core used for general casting. The "details" of the castings will be omitted as
they are obvious to those skilled in the art. Further, by using a material having a melting point
higher than that of the material of the main body 3 as the material of the fin /, it is possible to
correctly maintain the shape of twin / even after casting.
Furthermore, as shown in FIG. 5, there is also an advantage that it can be manufactured without
any problem even in the case where the throat portion has an outwardly bulging portion. The
horns obtained in this way are shown in FIGS. As is apparent from these figures, the shape of the
passage da divided by the fins / inside the body 3 of one bone is located in the passage da, since
it spreads outward gradually towards the tip opening. There is no hindrance to the operation of
pulling out the core 2 which had been. Also, at the time of casting, the upper and lower ends of
the fins 1 are embedded in the thickness of the main body 3 so that the fins / are firmly and
securely fixed in place in the main body 3. Further, according to the method of the present
invention, since the fins 1 are individually processed into a predetermined shape, the shape of
the particularly important inner end can be strictly controlled, and a horn having excellent
acoustic characteristics can be obtained. can get.
4. Brief description of the drawings Fig. 1 is a perspective view showing an example of a core 7
'used in the method of the present invention, Fig. 2 is a perspective view of the obtained horn,
and Fig. 3 is a longitudinal sectional view thereof. 4 is a cross-sectional view taken along 5-All of
FIG. 3, and FIG. 5 is a cross-sectional view taken along B-B11 of FIG. Half weight y% co ... core, 3body, 4I-passage. Patent applicant / Pioneer stock-Company's 1st mEndPage: 26 other than the
above 1st, 9th and 12th Nishishinjuku, Shinjuku-ku, Tokyo End Page: 3