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TECHNICAL FIELD The present invention relates to a flat diaphragm for a speaker. The prior art
and its problems-Ih17 2 'l' -4> 141, iF, preferably one having high rigidity of o gm hMσ of 1 o
tat + nm-r-, and conventionally has excellent properties in terms of internal friction and specific
gravity Corn paper made of pulp is often used. However, since the pulp material has low rigidity,
it has to be used by forming the pulp material into a substantially truncated cone shape. For this
reason, there is a problem that the accommodation space for accommodating the cone paper is
enlarged, and the cavity resonance occurs in the concave portion of the cone paper, and the
frequency characteristic is disturbed. In order to solve the problems relating to the frequency
characteristics, in recent years, a planar diaphragm having a honeycomb structure has been
adopted. However, a planar diaphragm having a honeycomb structure is likely to cause cell
resonance, and it is conceivable to increase the cell density in order to prevent the occurrence of
this cell resonance, but increasing the cell density complicates the structure and manufactures
There is a problem that the cost is increased and the high frequency distortion is large. On the
other hand, in order to solve the problems of the honeycomb structure, the applicant of the
present invention has dimensionally stability and internal friction. It has been proposed to apply
a wood thin plate having excellent characteristics in terms of rigidity and the like to a flat
diaphragm (Japanese Patent Application No. 60-246908). However, in general, since the lumber
sheet has a thickness of about 1 mm to 3 mm, it is weak to impact force and easily broken. For
this reason, although it is conceivable to increase the thickness, for example, in the case of a
woofer speaker, the flat diaphragm becomes heavy, the sound pressure level decreases, and
subtle sounds can not be reproduced. Requires a large magnet, which causes various problems in
terms of weight, space and economy. Means for Solving the Problem The present invention
solves the above-mentioned problems by forming a plurality of grooves on the bonding surface!
It is set as the structure which bonded the lumber thin board ¦ plates of lk provided so that the
said groove part might cross ¦ intersect mutually. The embodiment according to the present
invention will be described below with reference to the attached drawings of FIG. 1 to FIG. In the
first embodiment, as shown in FIG. 1, a plurality of straight grooves 2 are arranged in parallel
along the grain on each of the clogged surfaces of the wood sheeting 1.1 made of two pieces of
wood of lumber and A gravity wood sheet 1.1 is bonded with an adhesive so that the grooves 2
are orthogonal to each other. In this embodiment, since the grooves 2 are arranged in parallel
along the grid, there is an advantage that the groove 2 can be easily processed and the
dimensional accuracy is high.
In the second embodiment, as shown in FIG. 2, the above-mentioned first embodiment is a case
where the wood sheet 1.1 is directly bonded with an adhesive, whereas the wood sheet 1.1 is a
high tension fiber. It is a case where it is pasted together via cross 3. The high tension fiber cloth
3 is to increase the mechanical strength of the flat diaphragm, in particular, the Young's
modulus, and to prevent deformation and peeling of the flat diaphragm due to vibration, and is
made of, for example, carbon fiber, aramid fiber, boron fiber, etc. A cloth or a cloth impregnated
with a synthetic resin or the like is used. In general, a thermosetting or reactive resin is used for
the rFf synthetic resin. The other parts are the same as those of the above-described
embodiment, so the description will be omitted. According to the present embodiment, for
example, as shown in FIG. 7 and FIG. 8, the attachment of the flat diaphragm to the high tension
fiber cloth 3 from the wood thin plate l side is provided with holes 1a. When the leg 11 of the
speaker unit 10 is positioned within the hole la and the leg 11 and the high tension fiber cloth 3
are fixedly integrated with the adhesive 12 to vibrate the flat diaphragm, the center of vibration
is Since the high-tensile fiber cloth 3 is located between two sheets of wood lamina 1.1, the
deflection of the wood lamina 1.1 is approximately equal. For this reason, while being able to
prevent peeling of the thin wood board 1 grade ¦ etc., Distortion of a sound, there exists an
advantage of being good through sound. In the third embodiment, as shown in FIG. 3, the groove
2 is provided so as to penetrate the thin wood plate 1.1 in the above-described embodiment,
while the end of the groove 2 is left. It is. Others are the same as the above-mentioned
embodiment, therefore, according to this embodiment, since the end of the groove portion 2 is
left according to this embodiment, the rib effect is more exhibited, and the above-mentioned
embodiment It has the advantage of being stiffer than the example. Test Example 1 A plurality of
grooves were juxtaposed along the grain of the laminated surface of two wood thin plates made
of Sitka spruce grated material having a width of 190 mm, a length of 190 mm and a thickness
of 2 mm. The grooves have dimensions of 5 n + m in width, 1.4 mm in depth, and 185 mm in
length, and are arranged in parallel in 23 rows at the center of wood thin plate at intervals of 2
and 5 mm. Groove portions having a length of 169 mm and having the same cross-sectional
shape as the groove portions are arranged side by side at intervals of 2, 5 mm. Then, after
laminating the two wood thin plates (total weight 37 g of the two sheets) with Evoquin adhesive
(2, 2 g) so that the wood grain crosses at right angles, paint varnish (13 g) is applied and dried A
flat diaphragm (total weight 40 ° 5 g) was used as a sample.
Test Example 2 Two wood thin plates having the same material and the same external
dimensions as those of Test Example 1 and having the grooved portions are disposed so that the
wood grain crosses at right angles, and epoxy bonding is performed with the two wood thin
plates. Of 190mm square carbon fiber cloth (6, 8g) to be impregnated with the coating agent,
then paint varnish (1, 3g) is applied and dried, and a flat diaphragm (total weight 45.1g) is used
as a sample did. In addition, the impregnated amount of the epoxy adhesive to the carbon at
cloth is 60% of the weight of the carbon fiber Iff. Comparative Example I An epoxy-based
adhesive (2, 2 g) having the same material and the same external dimensions as those of Test
Example 1 and having two smooth wood thin plates without a groove without sticking to a
carbon fiber cloth. After pasting together, apply paint varnish (+, 3 g). A dried flat diaphragm
(total weight 65 g) was used as a sample. Test Example 1 The samples of Test Example 2 and
Comparative Example 1 were attached to a speaker unit (not shown) having a widely known
structure, and their frequency characteristics were measured. The results are shown in FIGS. 4, 5,
and 6. The measurement results shown in were obtained. Comparison between Test Example 1
(FIG. 4) and Comparative Example 1 (FIG. 6) shows that Test Example 1 is light in comparison
with 273 or less of Comparative Example 1 and that Test Example 1 is stable and smooth up to
about 500 Hz. While having frequency characteristics, the stable smooth frequency
characteristics of Comparative Example 1 were up to about 100 Hz. As a result, according to the
flat diaphragm applied to Test Example 1, it was found that subtle sounds can be accurately
reproduced. Test Example 2 (FIG. 5) and Comparative Example! As compared with (Fig. 6), Test
Example 2 is 30% lighter than Comparative Example 1, and Test Example 2 has stable smooth
frequency characteristics up to about IK Hertz, while Comparative Example I The stable and
smooth frequency characteristics were up to about 100 Hz. In addition, when the timbres of Test
Example 2 and Test Example 1 were compared and heard, Test Example 2 had better sharpness
than the Test Example 1 and sound dropout. As a result, it was found that the flat diaphragm
according to Test Example 2 can reproduce more subtle sounds more accurately than Test
Example 1 and Comparative Example 1. In the embodiment described above, the case of using
the grid material for the wood thin plate is not limited to the force described above, and it is a
matter of course that the wood thin plate may be board grain. In addition, if chemical
modification such as acetylation treatment is applied to the thin wood sheet, there is an
advantage that the moisture absorption is reduced, and the fluctuation of sound accompanying
the weight change of the thin wood sheet can be prevented. Effects of the Invention As is
apparent from the above description, according to the present invention, two wood thin plates in
which a plurality of grooves are arranged in parallel on the bonding surface are bonded so that
the grooves cross each other. The rigidity of the flat diaphragm can be increased without
increasing the weight.
For this reason, the flat diaphragm according to the present invention can be driven by a small
magnet, and its frequency characteristics are multiplied by several times, so that subtle sounds
can be reproduced. Moreover, since the two thin wood sheets are pasted together so that the
grooves cross each other, the directionality of the diaphragm is improved, and the divided
vibration is improved. Furthermore, since the spaces formed by arranging the grooves so as to
cross each other are not independent as in the honeycomb structure but are in communication, it
is difficult for cell resonance to occur. In particular, when compared to a planar diaphragm
having a honeycomb structure made of aluminum, since wood has a large internal loss, the
planar diaphragm according to the present application is less likely to cause cell resonance. Then,
when the high tension fiber cloth is sandwiched and integrated by two thin wood sheets and the
flat diaphragm is vibrated in the thickness direction via the high tension fiber cloth, the center of
the vibration is between the two wood thin sheets. Because of the high tension fiber cloths
located, the deflections of the two wood sheets are approximately equal. For this reason,
according to the flat diaphragm concerning this application, while being able to prevent peeling
of a thin wood board, distortion of a sound, and good sound penetration. Therefore, there is an
effect that it is possible to obtain a light-weight and highly rigid flat diaphragm, in particular, a
flat diaphragm suitable for a woofer speaker.
Brief description of the drawings
1, 2 and 3 show the first embodiment of the present invention.
The exploded perspective view showing the third embodiment, FIG. 4, FIG. 5, FIG. Test Example 2
The graph which shows the measurement result of the comparative example I, FIG. 7 and FIG. 8
are the perspective view and sectional drawing which show the test method of 2nd Example. ! ...
Wood sheet, 2 ... Grooves, 3 ... High tension fiber cloth. Special request applicant Chubu Cone
Manufacturing Co., Ltd. or one person Attorney Attorney Attorney Former: 2 persons Figure 5 M
5rBtx t n + z rm 6 Figure 彼 f f (Hl Ri ˜