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JPS51151123

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DESCRIPTION JPS51151123
o5♀、6. 長官 98 Patent Office Secretary Saito Hideo 1, the title of the invention speaker
Yo,-6-Yoji Yagi-[Faace] Japan Patent Office ■ Japanese Patent Publication 51-151.1230
published Japanese Patent 51. (1976) 12.25 Agency serial number q 〆 Tatata
4, agent 〒
A detailed description of the invention-this method uses a foamed urethane metal as a material,
and can produce a speaker cone with good reproduction frequency characteristics at a low cost,
that is, a conical portion raised from a flat portion A plurality of annular recessed grooves are
installed on the slope of the surface, and a circle (a convex strip having an arc-like cross section
is formed on the flat surface over the periphery of the only part (7 to form a male mold, another
flat surface The female mold is formed by forming an arc-shaped groove having an inner
diameter slightly larger than the cross-section of the ridge, with the rim of a bowl-shaped fourpart recessed from the part and slightly larger than the cone. The urethane resin plate is pressed
with heated male and female molds, the hardness of the conical part is canine, the hardness of
the annular convex part of the slope is a little small, the cross section of the peripheral
semicircular concave caustic part and its outer 'hardness of wound 1 It is characterized by
obtaining a speaker cone with a rather small haze. Speaker cone at noon is made of paper, made
of synthetic resin such as polyester thin film, made of paper cone with ring-shaped urethane
resin attached, made of cotton and synthetic inverted bottle, aluminum thin film There are
products made of foamed polystyrene thin film, etc., but there are many manufacturing processes
and suitable for mass production, high production price, poor frequency / frequencies, or
characteristic change due to moisture etc. There is a disadvantage of The speaker manufactured
by this method of explanation has the above-mentioned EndPage: 1 without the drawbacks, and
the following explanation will be given with reference to the drawings, in which the male A is flat,
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the fi part 1) 'etc. A plurality of annular grooves 3, 3 ', 3' '... .. are formed, and an annular ridge 4
having a semicircular cross section is formed on the flat portion 1 around the periphery of the
conical portion 20. (FIG. 1) The female die B forms a bowl-like recess 6 which is slightly larger
than the conical portion 2 from the flat portion 5, and is slightly thicker than the cross-sectional
diameter of the ridge 4 across its rim. Forming an arc-shaped groove 7 'of an inner diameter in
the flat portion 5; (Fig. 2) Thickness of 5 to 10? Make a plate q. Heat the male mold A and the
female mold B to about 230 "C, place the plate C on the female mold 13, and press the plate C
with a pressure of 2 to 5 times the male mold A from above. Do. After 10 to 60 seconds, remove
the male mold A and take out the product. The plate C is compressed to obtain a thin-film molded
article 1). (Fig. A. 5) The molded product is large in the hardness of the conical part A, and the
annular ridges 8, 8 'formed by the recessed grooves 3', 3 ". 8 "hardness ...... portion is small, the
hardness of the conical fabric Ia) Sakakiru mouth line sectional arcuate l given 9 and the outer
flat portion 10 of the is small.
The top of the molded product circle 811 b is cut into a circle, and the flat portion 10 is cut into
a circle to give a speaker cone E. The cone part A of the speaker cone E thus split is divided by
the ring-shaped ridges 8, 8 ', 8 "... With small hardness, so it spreads over a wide frequency range
It oscillates, so the frequency response is very good. In addition, since the hardness of the crosssection arc-shaped groove 9 around the rim of the conical part A and the flat part 10 outside
thereof is small, the flat part 10 as the cone attachment part and the conical part A of the sound
generating part Since the large arc-shaped grooves 9K and f are connected, the resistance
received by the cone part 1 at @ 1tII is small, resulting in good sound quality. The hardness of
the conical portion A of the product can be further increased by impregnating the portion where
the plate C is formed conical V-shaped with a thermosetting agent beforehand and then molding.
In this invention and method, since the foam polystyrene plate is compressed with the heated
male and female molds to form the speaker cone, the hardness is set to the partial force by
appropriately taking the shape of the female mold and the size of the gap. Different cones can be
produced, as a result of which the reproduction frequency characteristics are very good. Further,
since the product can be obtained only by molding with the whole plate of the material, it is easy
to manufacture and inexpensive.
4, Brief description of the drawing 1! Fig. 2 is a front view with a part of the female die cut away,
Fig. 2 is a front elevational view of the female die, Fig. 2 is an oblique view of the plate C of the
material, Fig. 4 is a vertical 1 equatorial view of the molded state, o 5 is a vertical front view of a
molded product, and 6 is a vertical front view of a speaker cone of a product. A: Male B: Female
C: Plate D = Molded product 1: Flat part 2: Conical part, 3.3 ', 3 ": Annular groove-4: Annular
ridge 5: Flat part 6: Slider-like Recess 7: Arc-shaped groove 8.8 ', 8 ": Annular ridge 9: Crosssection arc-shaped groove-10: Flat portion, ti view EndPage: 26, Agent other than-ml, 9EndPage:
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