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JPS55147899

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DESCRIPTION JPS55147899
Description 1, title of the invention
Acoustic transducer
3. Detailed Description of the Invention The present invention relates to an acoustic transducer
using a film diaphragm. Heretofore, in a speaker using a film diaphragm made of a photo-etched
finger or the like, as shown in FIGS. 1 and 2, using a sound absorbing phase 16 made of a soft
elastic material KJ: pressing the diaphragm 14 It turned over and browned the ten / yo /,
reduced the resonance (noise), and applied the damping of the low range. In the figure, reference
symbol M denotes a magnet, 12I'i yoke, 13 (佳 pole, j5 a diaphragm fixing frame, and 17 a
moving coil respectively. However, in the method of giving tension to diaphragm 14 by pushing
up with VC sound absorbing material 16 as described above, slight variations in the shape or
material of the sound absorbing material change the resonance, and the resonance (squeal)
frequency or fo (low range cut) Variations in off-frequency) etc. appear jl, which causes variations
in product quality at the time of quantity. Also, although the diaphragm 14 expands due to the
heat generated by the current @ and f'L in the etched moving coil j7, the result is that the sound
absorbing material 16 pushes up the diaphragm by that amount of expansion. , The vertical
position of the moving coil 17 fluctuates to adversely affect the characteristics of the speaker,
and further, the sound absorbing material 16i'j: the diaphragm because the stress characteristic
of the soft elastic body to be its filler is non-linear; 4 can not follow linearly with respect to
thermal expansion and contraction (static displacement) of 4 and large displacement (dynamic
displacement) VC due to large vibration, so that the diaphragm 14 is given a constant tension / EndPage: 1 In addition, it causes deterioration of mantissa characteristics and transient
characteristics. It is an object of the present invention to provide an acoustic transducer having a
structure capable of giving uniform film thickness to a film diaphragm by utilizing linear
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magnetic fields generated by magnetic simultaneous magnets. . Hereinafter, an embodiment of
an acoustic transducer according to the present invention will be described based on FIG. 3 to
FIG. FIG. 3 is a side view of a speaker showing an embodiment of the present invention, and FIG.
4 is a perspective view thereof. In the figure, 1 is a madai soto, 2 is a yoke, 3 is a pole, 4 is a film
diaphragm, 5 is a diaphragm fixing frame, and 7 is a moving coil. A suction member 8 made of a
magnetic material is attached to the film diaphragm 4 along the center line of the pole 3. The
member 8 is attracted downward in the figure by the magnetic flux 9 of the pole 3 and this gives
a proper tension to the film diaphragm 4, but in this case the tenon 7 via the diaphragm support
0 Since it can be seen on the diaphragm, the film diaphragm portion 4d provided with the
conductor pattern as the moving coil 7 has a tension acting horizontally.
In FIG. 5, a part of the center of the film diaphragm 4 is fixed on the pole 3, the suction member
8 is attached on the diaphragm 4 above both ends of the yoke 2, and the diaphragm support 10
is It is located on the top. Further, FIG. 6 shows a demagnetizing field magnetic circuit type, in
which two diaphragm bearings Xl 01] o 'with a predetermined interval are protruded from 4qQ
or one of the direction magnets, and a suction member 8 The diaphragm supports 10 'and 10'
are disposed between the two. The tension acting on the film diaphragm 4 through the
diaphragm support is the same as that shown in FIGS. 3 and 4, and the film diaphragm portion 4
aK has an appropriate tension in the horizontal direction. Given. The configuration and principle
of the present invention are not limited to the speaker, but are fancy. According to the present
invention, since the suction member is an octagonal material, it is very easy to make the material,
weight and shape uniform uniformly as compared with the soft elastic body related to the
conventional sound absorbing phase, and therefore, at the time of mass production In this case, it
is totally easy to make the product quality constant. In addition, since the magnetic field acting
on the suction portion is substantially linear, the position of the moving coil is caused even if the
film diaphragm is expanded and contracted (static displacement due to heat) by current (heat
generation of moving coil due to Ic) Since the suction member can be linearly moved up and
down according to the change of the suction member without fluctuating up and down, and it
becomes possible to give a substantially uniform tone, resonance of fo ) It is possible to reduce
changes in frequency, transient characteristics, etc. In addition, as another effect, the linear
motion of the suction member gives a diaphragm to a diaphragm by a linear movement of the
suction member also against a large displacement (dynamic displacement) of the imaging plate
due to a high level signal current or a large voice human power. In addition, because the width of
the displacement is large compared to the case where a sound absorbing rod by a soft elastic
body is used as a tendon donor, the vibration distortion with respect to the adult power signal is
small, and the guinaminono clearance can be broadened accordingly. It becomes possible.
4. Brief description of the drawings. FIG. 1 is a conventional example of an acoustic transducer
using a film diaphragm, and FIG. 2 is a side view, FIG. 3 and FIG. FIG. 3 shows an embodiment of
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the acoustic transducer according to the present invention, FIG. 3 is a side view, FIG. 4 is a
perspective view, and FIG. 5 and FIG. It is. · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · film diaphragm, 5 · · ·
diaphragm fixed frame, 7 · · · moving coil, 9 · · · .. Magnetic flux. Patent Applicant Trio Co., Ltd.
7P--EndPage: 2 Fig. 1 箪 2 徊 2 Fig. 3 Fig. 4 Fig. 6 End Page: 3
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