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JPS5883496

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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
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DESCRIPTION JPS5883496
[0001]
The present invention relates to a speaker diaphragm formed of a thermoplastic resin film and a
method of manufacturing the same. Recently, in place of a speaker diaphragm made of paper
material made of pulp fiber, a speaker diaphragm configured by molding a thermoplastic resin
film has been increasing. This is widely used for small-sized speakers because the physical
properties of the thermoplastic resin film are improved, it can be sufficiently opposed to the
paper diaphragm, and the manufacture is easy. As a speaker diaphragm made of a conventional
thermoplastic resin film, as shown in FIGS. 1 and 2, a lip 2 is provided on the cone 1 and the
cone 1 as shown in FIGS. 3 and 4. The bending portion 3 is provided on the outer circumference
of the case to enhance the strength. The one provided with the lip 2 can increase the strength in
the vibration direction as shown in FIG. 6, and the one provided with the bent portion 3 can
increase the strength in the radial direction as shown in FIG. It had become. However, those with
lip 2 lack strength in the radial direction, those with bend 3 lack strength in the vibration
direction, and they deform in the direction of weak strength when large input is applied, resulting
in many distortions. There was such a drawback. The present invention eliminates the abovementioned conventional drawbacks, and provides a speaker diaphragm having sufficient strength
in both the vibration direction and the radial direction, and provides the most effective
manufacturing method thereof. The purpose is food. In order to achieve the above object, the
present invention relates to a method in which a bent portion is provided on an outer peripheral
portion of a cone portion and a lip is provided from the bent portion to the cone portion, and a
method capable of easily manufacturing the configuration. It is a thing. An embodiment of the
present invention will be described below with reference to FIGS. 7 to 13. A speaker diaphragm 4
is made of a thermoplastic resin film such as polybisphenol phthalate resin. The speaker
diaphragm 4 has a cone portion 6 and a bending portion 6 at the peripheral portion of the cone
portion 5, and further, this bending portion 6 A plurality of ribs 7 are provided radially from the
12-05-2019
1
curved portion 6 to the cone portion 6. According to this configuration, the strength in the radial
direction is enhanced by the bending portion 6, and the strength in the vibration direction is
enhanced by the lip 7. Furthermore, since the lip 7 is provided from the bending portion 6 to the
cone portion 6, The strength of the thermoplastic resin film can be further enhanced, and
sufficient strength can be maintained even if the thermoplastic resin film itself is made thin and
lightweight. Such a speaker diaphragm 4 can be manufactured by the following method.
First, as shown in FIG. 9 as the molding die 8, an inverted truncated cone portion 1o for forming
the cone portion 6 on the flat surface 9 and a bent portion 6 around the inverted truncated cone
portion 10 The ring-shaped protrusion 11 is formed to form a plurality of vacuum suction holes
12 in the inverted truncated cone 10 and the ring-shaped protrusion 11. The clamper 13 is
formed of a star-shaped frame having a diameter larger than that of the ring-shaped protrusion
11 as shown in FIGS. The production of the diaphragm 4 for a speaker using the molding die 8
and the clamper 13 is carried out by using the thermoplastic resin film 14 heated to the
softening point as shown in FIG. The clamper 13 is disposed on the flat surface 9 so as to be
concentric with the inverted truncated conical portion 1o, and the peripheral portion of the
thermoplastic resin film 14 is clamped. When the thermoplastic film 14 is sucked using the
vacuum suction holes 12 in this state, the speaker diaphragm 4 as shown in FIGS. 7 and 8 is
obtained. That is, the cone portion 5 is formed by the inverted truncated conical portion 10, and
the bent portion 6 is formed between the inverted truncated conical portion 1 o and the ringshaped portion 11. As shown in FIG. 13, since the crimper 13 of the lip 7 is a star-shaped frame,
the lip 7 has a portion A far from the inverted truncated conical portion 1 o and the ring-shaped
protrusion 11 and a portion B close to it. The portion B close to the distance is cooled by first
contacting the inverted truncated cone portion 1 o portion / gull portion 11 and the distant
portion A is delayed in contact, and this most delayed portion A becomes the lip 7 0 Thus, the
speaker diaphragm 4 having high strength in any direction can be obtained by a very simple
device. As described above, according to the speaker diaphragm of the present invention and the
method of manufacturing the same, the strength in the vibration direction and the radial
direction can be sufficiently maintained, and no distortion occurs even when a large input is
applied. It is advantageous in that the thickness of the thermoplastic resin film to be used can be
reduced to reduce the mass as the diaphragm and the efficiency can be increased, and further,
the manufacture thereof is easy and the apparatus can be simplified. In addition, it has the effect
of becoming advantageous in terms of manufacturing cost, etc., and is of great industrial value.
[0002]
Brief description of the drawings
[0003]
12-05-2019
2
1 is a top view of a conventional speaker diaphragm, FIG. 2 is a front view of the same half
section, FIG. 3 is a top view of a conventional speaker diaphragm of a pond, and FIG. 4 is a front
view of the same half section FIG. 5 is an explanatory view showing a direction to increase the
strength of the speaker diaphragm shown in FIG. G1, FIG. 6 is an explanatory view showing a
direction to increase the strength of a speaker moving plate shown in FIG. FIG. 8 is a top view
showing one embodiment of the speaker diaphragm of the present invention, FIG. 8 is a front
view of the same half section, FIG. 9 is a sectional view of a molding die for manufacturing the
speaker diaphragm, and FIG. FIG. 11 is a top view of a molding die clamper, FIG. 11 is a front
elevational view of a half section, FIG. 12 is a sectional view at the time of molding, and FIG. 13 is
an explanatory view showing a state at the time of molding.
4 и и и Diaphragm for speaker, 5 и и и Cone portion, 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и molding
Mold, 9 и и и и и и Flat surface 10 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и vacuum suction hole, 13 иииииииииииииииииииииииииииииииииииии Thermoplastic resin film. Name of Agent
Attorney Nakao Toshio and others 1 Figure 1 Figure 2 Figure 5 Figure 6 Figure 10 Figure 589Figure 13
12-05-2019
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