JPS6194497

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DESCRIPTION JPS6194497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm intended to increase the rigidity of a neck portion. [Technical foreground of
the invention and its problems] The diaphragm for the speaker is, for example, a cone-shaped,
dome-shaped or the like diaphragm. However, the neck portion to which a voice coil as a drive
source is attached, that is, the attachment hole provided at the center of a cone-shaped
diaphragm, or the thickness of the outer peripheral portion of a dome-shaped diaphragm If the
wall thickness is uniform, the compliance is excessively increased, peaks and valleys are
generated in the output sound pressure characteristics, and only a low reproduction band can be
reproduced, and the sensitivity of the speaker is lowered. Therefore, as shown in FIG. 1,
according to the prior art, in the cone-shaped diaphragm a, the thickness of the neck portion
corresponding to the vicinity of the outer periphery of the mounting hole provided at the center
is thicker than the outer periphery. As a dome shaped vibration. In the plate d, the thickness of
the neck portion located on the outer periphery is formed thicker than the center. When forming
a cone-shaped diaphragm or dome-shaped diaphragm of such a metal, for example, it is difficult
to change the thickness when the foil is press-molded, vacuum evaporation using a masking
plate, The thickness is changed by vapor deposition on the diaphragm substrate using a physical
vapor deposition method such as ion plating or sputtering. In the case of a paper diaphragm, the
thickness of the diaphragm is changed by partially changing the size of the mesh of the
papermaking mesh at the time of paper making. However, with the diaphragm made of metal and
the above-mentioned conventional diaphragm made of paper, both of them take time and effort
in manufacturing, which makes it difficult to obtain accuracy as a product and causes variations
in performance as a speaker. Also, there is no growth in the high region, and there is a drawback
that the reproduction band becomes narrow. SUMMARY OF THE INVENTION The present
invention has been made in view of the above-described points, and the object of the present
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invention is to increase the rigidity of the neck portion to flatten the output sound pressure
characteristic to a high region and reproduce the reproduction band To provide a speaker
diaphragm which is easy to manufacture, inexpensive and inexpensive, and has no variation in
manufacturing accuracy and can improve the reliability of the product. DETAILED DESCRIPTION
OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described
below with reference to the drawings. Reference numeral 1 denotes a cone-shaped diaphragm
substrate in which a cone portion 1a and a gear / knob portion 1b are integrally formed by using
a metal mold material, and 2 denotes a highly rigid portion 2a on the neck portion 3 of the
diaphragm substrate 1. In order to form, it is a highly elastic material suitably laminated ¦
stacked by a fixing means, As this highly elastic material 2, metals, such as boron and helilium,
and ceramics, such as an alumina and a titania, are used, for example.
In order to laminate the highly elastic material 2 to the neck portion 3 of the diaphragm
substrate 1, if the high elastic material 2 is a metal such as boron or beryllium, the diaphragm
substrate 1 is placed in the vacuum deposition tank 4 In a state where the masking plate 5 is
polymerized, it is turned upside down and clamped by clamps 6.6; 6, 6. The highly elastic
material 2 such as boron or beryllium is accommodated in the tray 7, and the highly elastic
material 2 is used as an electron beam. The highly elastic material 2 is laminated on the neck
portion 3 of the diaphragm substrate 1 by evaporating with a heat source to form a highly rigid
portion 2a. When the high elastic material 2 is a ceramic such as alumina or titania, the high
elastic material 2 is laminated on the neck portion 3 of the diaphragm substrate 1 by thermal
spraying. An embodiment of the present invention is configured as described above, and the neck
portion 3 of the cone-shaped diaphragm base 1 is made of, for example, a metal such as boron or
beryllium, or a ceramic such as alumina or titania as the high elastic material 2. Since the high
rigidity portion 2a is formed by laminating, the rigidity of the neck portion 3 is increased.
Therefore, comparing the conventional output sound pressure characteristic B in which the high
elastic material 2 is not stacked with the output sound pressure characteristic of the present
embodiment, as shown in the fifth time, the output sound pressure characteristic A can be made
flat in the present embodiment. It can be extended to the high frequency, and the efficiency of
the speaker can be improved. In the above embodiment, although the case where the diaphragm
substrate 1 is molded of metal is described, in addition to the diaphragm substrate 1 being metal,
it is molded of corn paper, synthetic resin fiber, synthetic resin foam or the like. In this case, by
coating the high elastic material 2 by spray or the like using the masking plate 5, the rigidity of
the neck portion 3 can be increased by filling it in the fibers and bubbles of the diaphragm
substrate 1. . Although the cone-shaped diaphragm has been described in the above embodiment,
the high elastic member 2 is also laminated on the neck portion (peripheral side) of the domeshaped diaphragm using the masking plate 5 to form the high rigidity portion 2a. Needless to
say, it may be filled or filled to increase the rigidity. [Effects of the Invention] As described above,
according to the present invention, the rigidity is increased by laminating or filling the high
elastic material in the neck portion of the diaphragm base, and the output sound pressure
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characteristics are flat because the rigidity is increased. And the high frequency band can be
extended to widen the reproduction band. In addition, since it is sufficient to laminate or fill the
high elastic material only on the required neck portion using the masking plate, the manufacture
is simple and the cost is low, and moreover, the manufacturing accuracy is uniform and the
product reliability can be improved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view showing an example of a conventional cone-shaped diaphragm, FIG. 2 is
a sectional view showing an example of a dome-shaped diaphragm in the same manner, and FIG.
3 is a sectional view showing one embodiment of the present invention Fig. 4 is a cross-sectional
view showing an example in the case of manufacturing the diaphragm of the above embodiment,
and Fig. 5 shows the output sound pressure of the diaphragm of this embodiment and the
conventional diaphragm without laminating high elastic material. FIG.
DESCRIPTION OF SYMBOLS 1 ... Diaphragm base ¦ substrate, 1a ... cone part, 1b ... cap part, 2 ...
highly elastic material, 3 ... neck part. Fig. 4 r Fig. 5
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