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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
The present invention relates to a diaphragm for a speaker in which a spiral voice coil continuous
to a diaphragm is inserted into a magnetic gap of a magnetic circuit, and the diaphragm is
vibrated by an audio current flowing in the voice coil. In a conventional speaker of this type, as
shown in FIG. 1, one end of a voice coil bobbin 3 covering a voice coil 2 wound with a conductive
wire is adhered to a diaphragm 1 of a sheet of paper or metal thin layer. Bond the edge 4 to
dump the vibration of the diaphragm 1, insert the voice coil 2 into the magnetic gap formed by
the pole yoke 5 and the plate 6, and drive the voice coil 2 by the current flowing in the voice coil
2. And the diaphragm 1 vibrates to produce sound. Then, the voice coil bobbin 3 is bonded to the
diaphragm 1 after the voice coil 2 is mounted. Therefore, as shown in FIG. 2, the bonding portion
between the voice coil bobbin 3 and the diaphragm 1 has a large weight due to the weight by the
diaphragm 1, the voice coil bobbin 3 and the adhesive 7, and requires a force to drive. The
weight of this part causes losses in the high range. In addition to bonding the voice coil bobbin 3
with the adhesive 7, the vibration of the voice coil 2 is not transmitted until it is transmitted
while the vibration of the voice coil 2 is transmitted to the diaphragm. Transmission loss occurs.
Moreover, since the voice coil 2 is agitated on the voice coil bobbin 3, the thickness is the
diameter of the voice coil bobbin + voice coil, and the magnetic gap formed by the speaker ball
yoke 5 and the plate 6 must be large by the thickness of the voice coil bobbin. Since the magnetic
gear knob is increased and the efficiency is reduced because it has to be made, it has the
disadvantage that the magnet must be enlarged. In the present invention, the conventional defect
is eliminated by forming a diaphragm and a cylindrical portion to be a voice coil integrally with
deep drawing and forming a voice coil portion in which an alumina layer and an aluminum layer
are alternately formed on the cylindrical portion. There is no need for a coil bobbin, thus
reducing the loss of vibration transmission due to bonding between the diaphragm and voice coil
bobbin and the bonding portion, and narrowing the magnetic gap by the thickness of the voice
coil bobbin to provide a high efficiency, high sound quality speaker diaphragm The purpose is to
An embodiment of the present invention will be described below with reference to FIGS. In FIG. 3,
a is a flat plate of an aluminum thin film, which is drawn into a shape having a dome-shaped
diaphragm portion a1 and a cylindrical portion a2. Next, the shape of the voice coil is extracted
on the cylindrical portion a2 of the aluminum thin film a with a coating agent a3 such as a resist
ink as shown in FIG.
Then, in the next step, on the other hand, it is dipped in a treatment solution such as dilute
sulfuric acid to carry out alumite treatment, the portion other than that extracted by the coating
agent a3 is an alumina layer, and the portion extracted by the coating agent a3 is the aluminum
layer As C, the aluminum layer C in the shape of the voice coil as extracted by the coating agent
a3 is formed. In this process, the dome-shaped diaphragm portion a1 may or may not be
subjected to an alumite treatment. Finally, the coating a3 such as a resist ink is removed to
complete the process, and the insulation of the alumina layer makes the aluminum layer C a
conductive coil, forming a voice coil, serving as a conventional voice coil and voice coil bobbin
The diaphragm portion a1 is also integrated. In this embodiment, although the diaphragm
portion al having a dome shape has been described, as shown in FIG. 7, the diaphragm portion al
may be used as a cone-shaped speaker by having a cone shape. As mentioned above, the
diaphragm for the speaker according to the present invention is bonded because the diaphragm
and the voice coil portion are not coupled by a secondary material such as an adhesive as in the
prior art, but are integrated as one. Since the reduction of the rigidity due to is prevented and the
mass corresponding to the mass of the bonded portion can be reduced, the high frequency band
can be extended to a higher frequency band. Furthermore, since there is no energy transfer loss
at the bonded portion and the drive force generated in the voice coil can be transferred to the
diaphragm without loss, efficiency is enhanced, high frequency range attenuation is reduced, and
response to the input signal is achieved. A good speaker can be obtained. Moreover, since the
thermal conductivity of both the alumina layer and the aluminum layer is higher than that of the
conventional voice coil bobbin, the heat generated in the aluminum layer serving as the voice coil
is directly transmitted to the diaphragm and dissipated from the diaphragm, so the temperature
rise is reduced. Thus, the speaker can be excellent in heat resistance, excellent in linearity with
respect to an input signal, and excellent in input resistance. Moreover, since there is no voice coil
bobbin, the magnetic gap can be narrowed by that thickness, and the air gap flux generation
efficiency can be greatly enhanced compared with the same magnetic circuit material, shape, and
size. It can be an excellent speaker.
Brief description of the drawings
FIG. 1 is a longitudinal sectional view of a conventional dome-shaped speaker, FIG. 2 is an
enlarged sectional view of a bonding portion of the diaphragm and a voice coil bobbin, and FIGS.
3 to 6 show an embodiment of the present invention, 3 shows the molding process, FIG. 4 shows
the voice coil extraction state, FIG. 5 is a cross-sectional view of this incorporated in a speaker,
FIG. 6 is an enlarged cross-sectional view of the main part, and FIG. Another embodiment of the
present invention is shown.
a: aluminum thin film, al: diaphragm portion, a2: cylindrical portion, a3: coating agent, b: alumina
layer, C: aluminum layer. Patent applicant Pioneer Corporation Figure 1 Figure 4 Figure 5 Figure
5 a Figure 6 Figure 7 CI +
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description, jps60160297
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