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JPS61139184

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DESCRIPTION JPS61139184
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic driver used for a speaker of a system for driving a part of a case of an audio
device and reproducing the sound by its vibration. 2. Related Art In recent years, the shape of
audio equipment such as televisions and cassette tape records has been significantly reduced in
size, and even with built-in speakers necessary for sound reproduction, some improvements have
been made to shapes with good space factor and attachment. It is coming. Here, taking the
television set and describing the prior art, in order to realize a compact set, a speaker having a
rectangular speaker with a good space factor is attached to the side of the cent. However, even if
the shape of the speaker is rectangular, the space for the speaker is required on the front of the
set, which limits the compactness. In addition, since the sound pressure characteristics have
directivity when the speaker is attached to the side of the set, the sound pressure in the high
region is lowered at the position deviated from the front axis of the speaker, that is, in front of
the cent. was there. In order to solve these problems, a reproduction method has been considered
in which an electromagnetic driver for driving is attached to the front panel of the front surface
of the cathode ray tube constituting the set and vibrated, and the front panel is used as a
diaphragm. Hereinafter, the conventional electromagnetic driver described above will be
described with reference to the drawings. FIG. 2 shows an example in which a conventional
electromagnetic driver is attached to the front panel of a television set. In FIG. 2, 1 is a cabinet, 2
is a Braun tube, 3 is a front panel made of a material with high light transmittance such as glass
attached to the front of the Braun tube 2 or transparent acrylic, 4 is the back of the front panel 3
It is an electromagnetic type driver attached. FIG. 3 shows a partially cutaway sectional view of
the electromagnetic driver, wherein 5.6 is a square center pole integrally or mechanically
coupled to the square plate 7.degree. 8. 9.10 is a square center pole 5. , 6 and the angular
excitation coil, 11, 12, 13.14 on the square plate 7.8 on the outer periphery of the excitation coil
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9.1 o on two opposing sides of the square rod plate 15, 16 respectively , 17.18 are arranged in a
square rod-like permanent magnet, and the above-mentioned components constitute an
excitation unit of an electromagnetic type and a driver. A plate-like suspension 19 is fixed
between the square plate 7.8 of the excitation portion and fixed on the upper and lower surfaces
of both ends, and spacers 20, 21.22.23 of a shape are disposed, and a square diaphragm 24. 25
is fixedly held by a screw 28.degree. 29 so as to provide a predetermined same magnetic gap 26.
27 with the excitation portion, and the upper surface of the square diaphragm 24 is fixed to the
back surface of the front panel 3 of the television set.
The operation of the television cent and the electromagnetic driver configured as described
above will be described below. First, the two square diaphragms 24.25 are provided with the
same magnetic gap 26.27 with the excitation unit. Due to the arrangement, the attraction forces
acting on the square diaphragm cancel each other out and become zero, and in the steady state
where there is no electrical signal, the stress acting on the suspension 19 is also completely
eliminated. The exciting coils 9, 1 o are connected in series or in parallel to apply an electrical
signal. -A square diaphragm 24.2 !! supported via a spacer 20, 21.22.23 to a suspension / 1719
in a state of no stress corresponding to the signal current flowing to the exciting coil 9, 1 °. The
magnetic force acting on 5 changes to generate 5 driving forces. FIG. 4 is a characteristic
diagram showing the relationship between the driving force and the magnetic gap generated in
the square diaphragm 24.25. In FIG. 4, A is a driving force generated in the square diaphragm
24, B is a driving force generated in the square diaphragm 26, and a driving force C as a
combination of A and B is obtained in the two square diaphragms 24 and 2s. Works. That is,
although the square diaphragm moves up and down when an electric signal is applied, the whole
of the vertical movement has a symmetrical structure in which the other becomes wider when
the magnetic gap of one diaphragm becomes narrower. A symmetrical driving force is generated.
The upper surface of the square diaphragm 24 vibrating with the above-mentioned symmetrical
driving force is connected to the front panel 3, and is integrally vibrated to realize acoustic
reproduction according to the electric signal to the exciting coil 9.10. Problems to be Solved by
the Invention However, in the configuration as described above, a square rod-like permanent
magnet 11.12. Even if the thickness of j3.14 is small, when the magnetic force is sufficient and a
predetermined driving force can be obtained, in order to secure the magnetic gap 26 ° 27
between the square diaphragm 24.25, the above-mentioned permanent magnet 11.12 ° It is
necessary to arrange a square-rod plate 15, 18 ° 17.18 on the lower surface of 13.14, which
increases the number of parts and increases the number of bonding steps with the permanent
magnet, which lowers productivity. It was The present invention solves the above-mentioned
conventional problems, and provides a low-cost electromagnetic driver by reducing the number
of parts and improving the productivity. In order to achieve this object, the electromagnetic
driver according to the present invention comprises: a square center pole in which an exciting
coil is wound on a square plate; and two opposing sides of the outer periphery of the exciting
coil. A square bar permanent magnet lower than the square center pole is directly fixed to form
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an excitation portion, and a square diaphragm is formed in a stepped shape with steps provided
on the surface facing the square bar permanent magnet. With the spacers provided on the upper
and lower surfaces of both ends of the plate-like suspension protruding from the short side of the
plate, a predetermined magnetic gap and the above-mentioned excitation part are maintained
and fixed.
With this configuration, since the square rod-like plate required to secure a predetermined
magnetic gap with the diaphragm is not required at the lower part of the square rod-like
permanent magnet, the number of parts can be reduced and productivity can be reduced. Can be
improved. Embodiment An embodiment of the present invention will be described with reference
to the drawings. 1 (a) is a partially cutaway top view of an electromagnetic driver according to an
embodiment of the present invention, and FIG. 1 (b) is a partially cutaway sectional view of a
state where it is attached to a front panel. In FIG. 1 (-) and (b), 30.31 is a square center pole,
32.33 is a square grate, 34.degree. 35 is an exciting coil, and these are square center poles 5 and
6 of the prior art, square plate ends. , 8 and the configuration of the exciting coil 9.10. 36.37 °
38.39 is an angular rod-like permanent magnet lower than the height of the center pole and
directly fixed to opposing positions on the square plates 32 and 33 at the outer peripheral
portion of the exciting coil 34.35 The components described above constitute an excitation unit
of an electromagnetic driver. 40 is a plate-like suspension longer than the long side of the square
plate 32, 330, and the lower surface of the plate-like suspension plate 32. 33 is opposed to each
other, and is fixed between the square plates 32. 33 There is. 45.46 is provided with a step on
the surface facing the permanent magnet 36.37.38.degree. 39, and the spacer 41.42, 43. 44 so
as to maintain a magnetic gap 47.48.49.50 equal to the excitation part. The upper surface of the
stepped square diaphragm 45 is fixed, for example, to the back surface of the front panel 3 of the
television set, by means of a stepped square diaphragm fixedly held by screws 51.52. The
operation of the electromagnetic driver configured as described above will be described below.
Since the two stepped square diaphragms 45 and 46 are disposed with the same magnetic gear
knobs 47, 48 and 49 ° 5 o between the excitation portion and the excitation portion, an electric
signal is transmitted to the excitation coil 34. 35 When it is applied, the magnetic force acting on
the square diaphragm 45. 46 is changed to generate a driving force. Since the structure is
completely symmetrical, as in the conventional example, symmetrical driving force is generated
in the square diaphragm 45.46, and sound reproduction according to the electric signal from the
front panel 3 to the exciting coil 34.35 Is realized. As described above, according to this
embodiment, a square rod-like permanent magnet 36.37.38.39 lower than the height of the
square center pole 30.31 is directly fixed to the square plate 32.degree. , A stepped square
diaphragm provided with a step on the opposite surface to the square rod-like permanent magnet
36.degree. 37.38.39 maintains an equal magnetic gap 47, 4B, 49.50 between the excitation part,
and it is completely the same as in the prior art. The same symmetrical driving force can be
obtained. (5) A square bar plate on the lower surface of a square bar permanent magnet, which
has been required in the past, is not required to deteriorate the performance, thus reducing the
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number of parts and improving the productivity of the bonding process. Can be
In the present embodiment, although the drive surface is the front panel of the television set, the
upper surface of the square diaphragm is a part of a housing of an audio device such as a radio
or cassette tape recorder, or a wall, a door, a desk, etc. Similar sound is possible even if it is
attached to furniture, car doors, window glass, etc. Effects of the Invention As described above,
according to the present invention, a square angular permanent magnet is directly fixed to a
square plate, and a stepped angular diaphragm provided with a step on the surface facing the
square permanent magnet is used for both ends of a plate-shaped suspension. The spacer
provided on the upper and lower surfaces holds the magnetic gap and the predetermined
magnetic gap in a fixed manner, so that the square bar plate on the lower surface of the square
bar permanent magnet, which has been required conventionally, is eliminated. By obtaining
exactly the same symmetrical driving force, it is possible to reduce the number of parts and to
improve the productivity of the bonding process and the like without deteriorating the
performance.
[0002]
Brief description of the drawings
[0003]
1 (a) is a partially cutaway top view of an electromagnetic driver according to an embodiment of
the present invention, FIG. 1 (b) is a side cross sectional view of the same part, and FIG. 2 is a
conventional electromagnetic driver. FIG. 3 is a side sectional view of a part of the conventional
electromagnetic type driver, and FIG. 4 is a characteristic view of the driving force of the driver.
3······················································································
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· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 28.39 · · · · · · permanent
magnet, 43, 44 · · · · · · · · · · · · · · · · · · · · · · · square plate moving plate, 47, 48, 49. 50 · · · · · · · · · 0
magnetic gap 0 agent Name of Patent Attorney Nakao Toshio Other 1 person 30.3j-"-cornered
outside 5th base-no (3f-39-1 permanent i repellant 40--W's 19 back 3s 4f ... 44---(b) height 2 l
Fig. 3 Fig. 4
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