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JPS56136097

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DESCRIPTION JPS56136097
Description ■, the name of the invention
Method of manufacturing speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a speaker diaphragm by subjecting a metal base integrally formed with a
vibrating surface portion and a cylindrical bobbin portion to surface hardening treatment
including heating. In the past, it has been considered that a metal foil is formed in advance into a
desired diaphragm shape in one of the speaker diaphragms, which is diffused to diffuse foreign
atoms from the surface of the substrate by heating and then cured (see FIG. For example,
Japanese Patent Application Laid-Open No. 53-77220, etc.), such a speaker diaphragm is
considered to be one of the superior in terms of both the performance and the cost of the
application. Among the conventional speaker diaphragms of this type, a method of
manufacturing a speaker diaphragm in which a vibrating surface portion and a bobbin portion
are integrally formed will be described based on FIG. In FIG. 1, 1 is a metal base made of a metal
foil in which a vibrating surface portion 1a and a cylindrical portion are integrally formed with a
bottle portion 1b, 2 is a jig fitted to the inner surface of a bobbin portion tb of the metal base 1, 3
is a metal A powdery diffusion treatment agent for supplying foreign atoms to be diffused from
the surface of the substrate 10, 4 contains the diffusion treatment agent 3 in which the metal
substrate 1 in a state in which the jig 2 is fitted on the inner surface of the + N bin portion 1b is
embedded. A heat-resistant cover made of a heat-resistant material, a heat-resistant cover for
sealing the five-burning furnace 4, and a heating heater 6 wound around the outer circumference
of the furnace 4. EndPage: 1, that is, in the state shown in FIG. 1, the inside of the furnace 4 is
first evacuated to a vacuum atmosphere, and then the heater 6 is energized to heat the furnace 4.
When the furnace 4 is heated, the temperatures of the metal base 1, the jig 2 and the diffusion
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treatment agent 3 inside the furnace 4 rise. This heating is in the metal substrate 1. The metal
base 1 (and the jig 2) taken out of the furnace 4 is held until the temperature required to diffuse
the hetero atoms in the diffusion processing agent 3 is reached and kept at the diffusion
temperature for a fixed time. As a result, a speaker diaphragm having a surface-hardened layer
can be obtained by diffusing foreign matter expanders from the surface to the portion of the
entire area substrate 1 in contact with the jig 2, that is, the portion excluding the inner surface
portion of the bobbin portion 1b. It is. However, in the conventional speaker diaphragm
manufactured using the jig 2 shown in FIG. 1, most of the bobbin portion 11) of the metal base 1
is prevented from being deformed by the jig 2. It is impossible to prevent the deformation of the
lower end portion of the bottle portion 1b, and there is a disadvantage that the lower end portion
is warped outward. The present invention was made to eliminate the above-mentioned
drawbacks, and γ1? An object of the present invention is to provide a method of manufacturing
a speaker diaphragm which can prevent deformation of the lower end portion of the bin portion
and does not cause deformation over the entire bobbin portion.
Method of manufacturing speaker diaphragm
The present invention will be described in detail with reference to FIGS. 2 to 4 below. FIG. 2 is a
schematic view for explaining one embodiment of a method of manufacturing a speaker
diaphragm according to the present invention. In FIG. 2, reference numeral 1 denotes a metal
base made of metal foil integrally formed with a vibrating surface portion 1a and a cylindrical
bobbin portion 1b. , 1c is the lower portion of the outer surface of the bobbin portion 1b of the
metal base 1, ld is the lower end face portion in the same manner, 7 is fitted on the inner surface
of the bobbin of the metal base 1) b to cover the inner surface. It is a jig in which a lower end
surface covering portion 7a covering the lower end surface portion 1d of the bottle portion 1b is
integrally formed. That is, according to the present invention, it is presumed that the surface
hardened layer by the diffusion of different atoms is also formed on the inner lower portion of
the bottle portion 1b as the reason why the lower end portion of the bobbin portion 1b is
deformed in the conventional method. It is made from That is, in the conventional method, the
lower end portion of the bobbin portion 1b is deformed because the lower end portion of the
bobbin portion 1b is softened faster than the other portions of the bobbin portion 1b due to heat
conduction by the jig 2 (see FIG. 1). Since the surface hardening layer is formed also on the lower
surface of the inner surface of the bobbin portion 1b because it is deformed or expanded, it is
presumed that the surface hardening layer does not shrink as in the original in the cooling
process of the surface hardening treatment. Focusing on such a point, in the present invention,
the lower end surface covering portion 7afd is illustrated to support not only the inner surface of
the bobbin portion 11) but also the lower end surface portion 1d. If the surface hardening
process is performed in the same manner as in the conventional method, the lower end surface
portion contact portion 7a extends to the lower end surface portion 1d of the bobbin portion 1b.
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The formation of the surface hardened layer at the lower part of the inner surface is prevented,
and a loudspeaker diaphragm without deformation of the lower end of the bobbin portion 11) is
obtained. In the above-described embodiment, an example in which the lower end surface
covering portion 7a is integrally formed as the jig 7 is exemplified]-but in addition, as shown in
FIG. The outer surface lower coating 7b covering the lower outer surface IC of the bottle portion
1b may be integrally formed, or the outer surface lower coating 7b may be separately formed as
shown in FIG. 4 VC. Even if it is, the same effect as the above-mentioned example is acquired.
Further, in the above embodiment, the case of performing surface hardening processing by
heating and diffusing foreign matter atoms has been described, but in the case of performing
surface hardening processing including other heating such as chemical vapor deposition, the
same as in the above embodiment It is not a pity that the effect of can be obtained. As described
above, according to the present invention, the surface hardening treatment including heating is
performed using the jig 7 formed so as to cover not only the inner surface of the bobbin portion
1b but also the lower end surface portion 1d or the outer surface lower portion ICff1 of the
bobbin portion 1b. As a result, the surface hardening layer is not formed on the lower surface of
the inner surface of the bottle portion 1b at γ, so that the deformation of the lower end portion
of the bobbin portion 1b is prevented.
There is an effect that it is possible to manufacture a speaker diaphragm in which deformation
does not occur over the entire bin 1 part 1b.
4. Brief description of the drawings. FIG. 1 is a diagram for explaining the conventional method,
FIG. 2 EndPage: 2 is a diagram for explaining an embodiment of a method for manufacturing a
speaker diaphragm according to the present invention, FIG. And FIG. 4 is a side sectional view
showing a modification of the jig used in the method of the present invention. {Circle over (2)}
Metal base, Ia: Vibration surface portion, lb: Bobbin portion, Ic: Outer surface lower portion, ld:
Lower end surface portion, 7: Jig, 7a: Lower end surface portion coating portion , 7b ... outer
surface lower covering portion. In the figures, the same reference numerals indicate the same
parts of the same neck. Agent Shinno-Fig. 2 EndPage: 3
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