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Description 1, title of the invention
Speaker voice coil
3. Detailed Description of the Invention The present invention relates to the improvement of the
material surface of a voice coil for a speaker. The speaker voice coil can be light in weight, can be
driven with high efficiency by reducing direct current resistance, and can prevent noise
generated in the coil, etc. However, when the winding is fixed, the coil can be used. In order to
reduce the weight, the cross-sectional area of the coil may be reduced or the coil may be made of
a material of low density. However, as the cross-sectional area is reduced, the direct current
resistance is increased, and therefore, a material having a small resistivity is required. That is, a
material having a small density 小 さ い of material and a low specific resistance is desirable. By
the way, whether or not it is suitable as a coil material is to compare ρ · K, which is the product
of ρ and K, and it is better to have a smaller value. The following table compares rho · K with
copper, aluminum, silver conventionally used, and ベ リ of beryllium used in the present
invention. Above the table Sibelik! It can be seen that A is the best for EndPage: 1 in conjunction
with the coil material. The present invention has been made in view of a point of view, and an
object of the present invention is to provide a speaker voice coil capable of reducing the mass of
the vibration system and improving the characteristics and obtaining a high driving force. To do.
An embodiment of the present invention will be described below with reference to the drawings.
First, a method of manufacturing a coil by Beri Ium will be described. Beryllium is made into a
thin plate of a certain thickness for rolling, and this beryllium thin plate is made into a sandwich
structure with a stainless steel plate, and all the end faces are welded. The whole is then heated
and rolled with a roller to a predetermined thickness, and the periphery is cut to remove the
stainless steel plate to obtain a thin beryllium sheet (15 to 30 μ). Then, the beryllium thin plate
is applied, and exposure is performed by contacting a mask having a predetermined coil shape
pattern. The exposed thin plate is exposed and etched to produce a coil. In the second
manufacturing method, since it is very difficult to manufacture the above-mentioned beryllium
thin plate by rolling, beryllium is plated on the substrate by physical or chemical plating, and the
substrate is etched. Or peel off the substrate by thermal shock. Then, the thin plate obtained in
this manner is etched in the above-described process to produce a coil. As still another
manufacturing method, a coiled pattern is directly manufactured on a substrate by mask
evaporation, and the substrate is removed to obtain a coil. When attaching a coil to a vibration
system, the substrate is often used to fix the coil to a voice coil bobbin.
Therefore, as another manufacturing method of a coil, a beryllium thin film provided with xsMri
on a plastic substrate having a predetermined shape or its surface is formed, a resist is coated on
the surface of the beryllium thin film, and a coil is formed by etching. The coil thus obtained does
not need to be attached to the substrate again, and the assembly process can be simplified. The
coil obtained by the above-mentioned manufacturing method is very light in weight, can be
increased in number of turns, and DC resistance is low. In order to use the coil 1 of FIG. 1
obtained by the above-mentioned manufacturing method as a voice coil of a speaker, the coil 1
may be hardened with resin or attached to a plastic film. In addition to the plastic film, an
adhesive may be used as an insulator on a metal thin plate or a carbon thin plate, or an insulating
layer may be provided for bonding. The specific example is shown in FIG. That is, coils 1 and 1
'made of the above-mentioned beryllium thin film are attached to both sides of the plastic film 2,
and the notch holes 2a are opened in the portions where the central portions 11L and 1 &' The
central portions 1a and 1a 'of the coils 1 and 1' attached to both sides are connected. The lead
wires 3 and 4 are connected to the outer end portions 1b and 1b 'of the coils 1 and 1'. If the lead
wires 3 and 4 are provided in advance in this way, the lead processing becomes easy. Further, by
pasting the coils 1, 1 'on the both sides of the plastic film 2 with EndPage: 2 and connecting the
central portions 11L, 1 &' to each other, a film having high sensitivity and doubled number of
turns can be obtained. . In addition, although it is difficult to make Ba-IJIJ simple substance into a
generally used coil shape, if beryllium is vapor-deposited on a thin film plate and this is cut into a
linear shape, it has the same shape as a conventional coil material. The coil can be made. Further,
although the above description has been made using beryllium alone, it may be an alloy
containing beryllium as a main component as well. As described above, according to the present
invention, by using beryllium as a voice coil, the mass is small and the number of turns can be
increased, and the direct current resistance is also small. An effect such as a force can be
obtained is obtained, and it is extremely effective as a voice coil of a small hi-fi speaker whose
imaging system is lightweight.
4, a brief description of the drawing. The figure shows a voice coil according to the present
invention, FIG. 1 is a plan view of the coil, FIG. 2 is a plan view of the same coil as the voice coil,
and FIG. 3 is a sectional view taken along the line I-I. is there. 1 ------ °° 01 coils 1a- ° ------center 1b ········· outer end 2 °°°°° s °°°° s ° plastics Film 3.4 · · · · · · · · · · · Lead wire
patent applicant Pioneer Corporation 3