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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker moving plate used for various audio devices. Prior Art Conventionally, as shown in FIG.
6, in the electrodynamic speaker, the lead wire 15 of the voice coil 14 is soldered to the end of
the gold wire 13 on which the eyelet 16 has been soldered in advance on the diaphragm 12. ,
And electrical coupling between the voice coil 14 and the terminal 17 has been performed.
According to this invention, there are problems as shown in FIGS. 7 and 8 according to the
present invention. First, in FIG. 7, lead wire 16 of voice coil 14 to the surface of diaphragm 12,
extend it to the position of eyelet 16 and press lightly on diaphragm 12 so that lead wire 15 does
not become a bridge. Solder the wire 13 and the lead wire 15 together. Next, a reinforcing agent
18 is applied to fix the lead wires 16 to the diaphragm 12, and further, a dust cap 20 is applied
using an applicator 22 so that the adhesive 19 is applied over the reinforcing agent 18. Apply At
this time, if the lead wire 16 is in a bridge state, the lead wire 15 is cut at the tip of the applicator
22. Next, as shown in FIG. 8, in order to completely cover the lead wire 15, the surface of the
diaphragm 12 is raised and swelled by the application of the reinforcing agent 18, and the dust
cap 20 is deteriorated. If it is pasted, it inclines, instability of pasted joining and appearance
defect, and furthermore caulking eyelet 16, surface thickness of diaphragm 21 of eyelet 16
circumference becomes thin, rigidity strength is lower, This lowers the high frequency band limit
frequency, and the variation of the dust cap 2o causes a variation in high voltage frequency
characteristics. The present invention is intended to provide a speaker diaphragm that can solve
the above-mentioned problems. Means for Solving the Problems In order to solve the abovementioned problems, the present invention is such that concave portions are provided in the
radial direction on the surface of the diaphragm, and an eyelet is applied to the bottom of the
concave portions. In the present invention, by providing the concave portion on the surface of
the diaphragm, the cutting of the lead wire and the rise of the reinforcing agent are eliminated,
and at the same time, the bending rigidity of the neck portion of the diaphragm is improved, and
the quality, appearance and characteristics are further improved. The speaker diaphragm is
provided. EXAMPLE Hereinafter, a speaker diaphragm in an example of the present invention
will be described. FIG. 1 is an enlarged sectional view of a main part, and FIG. 2 is a front view of
the entire diaphragm. 3 and 4 are cross-sectional views of the speaker to which the present
embodiment is applied, and FIG. 6 is a characteristic diagram showing comparison of sound
pressure frequency characteristics of the conventional example and the present embodiment.
First, as shown in FIG. 1, the groove of the recess 1 is provided from the neck portion of the
diaphragm 2 to the position of the eyelet 4. FIG. 2 is a front view of the diaphragm 2, in which six
recesses 1 are provided. As shown in FIG. 3, with the lead wire 6 from the voice coil 6 inserted in
the groove of the recess 1 of the diaphragm 2, soldering 7 to the end of the gold wire 3 soldered
to the eyelet 4 in advance. As a result, there is no bridge phenomenon of the lead wire 6 and no
swelling of the reinforcing agent 9, and the lead wire 6 will not be cut at the tip of the coating
machine 10. Furthermore, as shown in FIG. 4, no inclination of the dust cap 11 is observed. Next,
as shown in FIG. 6, by providing the groove of the recess in the neck portion of the diaphragm of
this embodiment, the bending rigidity is improved in structure, and as a result, the high
frequency limit is compared with the conventional example. The frequency will be extended.
Effect of the Invention As described above, since the diaphragm of the present invention has no
lead wire bridge, the workability is good and the appearance is also good. Also, since there is no
inclination of the dust cap, stable sound pressure frequency characteristics can be obtained.
Furthermore, by forming the recess, the bending rigidity of the neck portion is improved, and the
high frequency limit frequency is further extended.
Brief description of the drawings
1 is a main enlarged cross-sectional view of this embodiment, FIG. 2 is a front view of this
embodiment, FIG. 3 and FIG. 4 are cross-sectional views of this embodiment applied to a speaker,
and FIG. FIG. 6 is a cross-sectional view of a conventional speaker.
1............ Name of Agent Attorney Nakao Toshio Other 1 person 3-gold thread line Fig. 4 Fig. 5
Frequency & (#! :) Fig. 6 wc 7
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