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JPH02170798

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DESCRIPTION JPH02170798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrical-to-vibration transducer of a speaker used in audio equipment. (Prior Art) Currently
widely used speakers are roughly classified into three types: electrodynamic type,
electromagnetic type, and piezoelectric type, and any of these speakers is a diaphragm and a
driver (so-called conversion mechanism) And an electric-sound IP converter that converts an
electric signal into an acoustic signal, and the electric-sound converter is used by being fixed in a
predetermined housing. The acoustic output is also influenced by the type of driving body, but it
is also greatly influenced by the diaphragm which is a medium for converting the vibration into
an acoustic signal. (Problems to be Solved by the Invention) However, the conventional electroacoustic transducer converts the electric signal into the vibration signal as described above
(electric-vibration transducer), and further converts the drive output into an acoustic signal. Since
the basic acoustical characteristics are roughly determined by the electro-acoustic transducer
since the vibrator (the diaphragm) to be converted is integrally provided, the electro-acoustic
transducer as the sound producing medium is assumed to be already installed. The current
situation is that there is no option. The present invention has been made in view of the above
circumstances, and an object of the present invention is to separate an electro-acoustic
transducer into a driver (electric-vibration transducer) and a vibrator (diaphragm). An object of
the present invention is to provide an electric-vibration converter which can be used by
arbitrarily selecting a vibrator. (Means for Solving the Problems) In order to achieve the above
object, the present invention provides (1) a vibration having a magnetic circuit fixed to a frame
and a voice coil disposed in a predetermined gap in the magnetic circuit. A radiation contact
piece is provided, the vibration radiation contact piece is supported by a frame via a suspension,
and an electric signal is input to the voice coil to vibrate the vibration radiation contact piece in
one axial direction, with respect to the vibration direction. An electric-vibration converter in
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which a vibration plate is provided in the vertical direction so as to be fixedly attached to or
detached from the vibrating radiation contact piece, and (2) a magnetic circuit fixed to a frame
and the center of the magnetic circuit. A through hole is provided in the shaft, and a cylindrical
amateur inserted into the through hole is provided, and the upper and lower portions of the
amateur are supported by the frame by the suspension. The vibrating radiation contact piece is
attached to the upper end surface of the armature, a voice coil is provided below the periphery of
the vibrating radiation contact piece, and the voice coil is disposed in a predetermined gap in the
magnetic circuit. The vibration radiation contact piece is supported by an armature and vibrated
in one axial direction, and a vibrator is provided in a direction perpendicular to the vibration
direction so as to be fixedly or detachably attached to the vibration radiation contact piece. It is a
converter.
(Operation) The electric-vibration converter configured as described above is provided with a
magnetic circuit fixed to the frame and having a predetermined gap, and provided with a
vibrating radiation contact piece supported by the frame via a suspension. A voice coil fixed to a
piece is disposed in a predetermined gap of the magnetic circuit, and an electric signal is input to
the voice coil to vibrate the vibration radiation contact piece in one axial direction and vibrate in
the one axial direction. The diaphragm can be detachably attached to the vibrating radiation
contact piece, so that the diaphragm and the electric-vibration converter can be separated, and it
becomes possible to attach the diaphragm without any restriction as the diaphragm. In addition
to the diaphragms conventionally determined, any one can be selected and used. (First
Embodiment) The first embodiment of the present invention will be described with reference to
FIGS. 1 and 2. As shown in FIG. 1, the electric-vibration converter A includes a yoke 1 having a
disc-shaped bottom portion 1a and a ring-shaped projecting portion 1b provided around the
bottom portion 1a, and the yoke 1 A columnar magnet 2 provided at the center of the housing
and smaller than the diameter of the projection 1b, a disc-shaped pole piece 3 provided on the
magnet 2, the pole piece 3 and the projection 1b of the yoke 1 And a plurality of suspensions 7
provided in a direction inward of the upper side flange 5a of the frame 5 and supported by the
suspensions 7. A vibrating radiation contact piece 6 provided in parallel on the pole piece 3, a
voice coil 8 disposed in the predetermined gap 4 on the lower surface side of the vibration
radiation contact piece 6, and a lower surface side of the frame 5 Provided in It is constituted by
a PC board 9. When the electric-vibration converter A having this configuration inputs an electric
signal to the voice coil 8 through the printed circuit board 9, the vibration radiation contact piece
6 is in proportion to the magnitude of the electric signal manually input to the voice coil 8. It
vibrates up and down. Since this vibration is supported by the suspension 7, it appears as
vibration in the direction of one axis, and the magnitude of its amplitude changes in proportion
to the magnitude of the input electrical signal. The vibration signal of the vibrating radiation
contact piece 6 is converted into an acoustic signal by attaching the diaphragm to the vibrating
radiation contact piece 6 performing such vibration. As shown in FIG. 2, it is sufficient that the
diaphragm 23 of a flat disk, for example, be fixed to the vibration radiation contact piece 6 by a
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mounting screw 22 as shown in FIG. The diaphragm 23 may be a flat square or any of a cone
shape, and the shape and size can be freely selected.
(Second Embodiment) The second embodiment of the present invention relates to the structure
of the electric-vibration converter B and will be described with reference to FIGS. As shown in
FIG. 3, the electric-vibration converter B is composed of a disc-like bottom portion 10b having a
through hole 10a at its center, and a ring-like projecting portion 10c provided around the bottom
portion 10b. A cylindrical magnet 11 having a yoke lO and a through hole 11a larger than the
through hole 10a at the center of the yoke lO and smaller than the diameter of the protrusion
10c, and a through hole provided on the magnet ll A ring-shaped pole piece 12 provided with
12a, and a magnetic circuit portion provided with a predetermined gap 13 between the pole
piece 12 and the projecting portion 10c of the yoke 10 are accommodated and fixed, and the
through hole is formed in the bottom portion A frame 17 having a communication hole 17a
communicating with 10a, 11a and 12a, an armature 15 inserted into the through holes 10a, 11a
and 12a and the communication hole 17a, and The front suspension 16 provided on the upper
part of the amateur 15, the rear suspension 18 provided on the lower part of the amateur 15,
and the projection 10c of the yoke IO of the pole piece 12 suspended at the periphery of the
amateur 15 A voice coil 14 disposed in a predetermined gap 13 formed therebetween, a
vibrating radiation contact piece 19 mounted on the upper portion of the armature 15, and a
magnetic circuit provided on the upper surface of the frame 17 abutting on the armature 15 And
a printed circuit board 21 attached to the bottom side of the frame 17. The armature 15 has a
substantially T-shaped cross section, and the armature upper portion 15a is provided with an
inner concave disc portion and an outer ring portion on the outer side thereof, and the outer
peripheral surface of the outer ring portion is the front suspension 16 , And a thin-walled
cylindrical portion for mounting the voice coil 14 is formed on the lower side of the outer ring
portion. The lower portion 15b of the armature is a cylinder provided penetrating the through
holes 12a, 11a and 10a, and a central projection is formed at the lowermost end, and the central
projection can be the rear suspension 1 day The armature 15 is supported by the rear
suspension 18 and the front suspension 16, and the vibration generated when an electric signal
is input to the voice coil 14 is excited as the vibration in one axial direction. Further, the vibrating
radiation contact piece 19 is fixed in the concave concave disk portion at the upper part of the
armature, and the vibration in the direction of one axis of the armature 15 vibrates the vibrating
radiation contact piece 19 only in the X direction in the figure. .
The diaphragm 23 mounted on the vibration radiation contact piece 19 of the electric-vibration
converter B configured as described above is the same as that shown in FIG. 2 of the first
embodiment, and the diaphragm 23 is fixed by the mounting screw 22. An example is shown in
FIG. The present invention is not limited to the first embodiment and the second embodiment
described above (if it is an electro-vibration transducer that radiates vibration in a uniaxial
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direction in the vibration radiation contact piece, it has the same effect as the present invention)
is there. In addition to this, the speaker of the present invention, in which the electric-vibration
transducer and the diaphragm are configured to be separable and the diaphragm is arbitrarily
selected and attached, is applicable to various applications and is possible Although the gender is
infinite, it is added that the panel type speaker etc. can be considered as the example. (Effects of
the Invention) As described above, the electric-vibration converter of the present invention
comprises: (1) a magnetic circuit fixed to a frame, and a voice coil disposed in the magnetic
circuit for a predetermined period of time And an oscillating radiation contact piece supported by
a suspension at its upper surface on the upper surface of the voice coil, and in parallel with the
oscillation radiation contact piece and in a direction perpendicular to the vibration direction. It is
characterized in that it can be fixedly or detachably attached, and this configuration can be
expected to be particularly thin. (2) A magnetic circuit fixed to the frame and a through hole are
provided on the central axis of the magnetic circuit, and the through hole is inserted into the
through hole and the upper and lower portions thereof are supported by the suspension attached
to the frame. An amateur, a voice coil provided vertically at the periphery of the amateur and
disposed in a predetermined gap in a magnetic circuit, and a vibration provided on the upper
surface of the amateur and extending in a direction perpendicular to the central axis of the
amateur And a radiation contact piece, wherein the diaphragm is fixedly or detachably attached
in a direction parallel to the vibration radiation contact piece and perpendicular to the vibration
direction. Thus, the vibration in the axial direction of the vibrating radiation contact piece is
accurately supported by the armature. These electric-vibration converters have the following
comprehensive effects. (A) The function as an electro-acoustic transducer can be formed simply
by attaching to any diaphragm, and (0) no special treatment (shape etc.) is required for selection
of a diaphragm and there is no restriction. (C) In forming the electro-acoustic transducer, the
electro-vibration transducer can shut off the outside air with an arbitrary diaphragm, and is easy
to be waterproofed (for outdoor electro-vibration transducer Is suitable).
(D) Planarization and thinning are easy. Etc, there are many advantages.
[0002]
Brief description of the drawings
[0003]
1 and 2 are the first embodiment of the present invention, FIG. 1 is a cross-sectional view of the
electric-vibration converter A, and FIG. 2 is a perspective view of the diaphragm attached to the
same A. FIG. A circular diaphragm, Q)) is a square diaphragm, FIGS. 3 and 4 show a second
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embodiment of the present invention, FIG. 3 is a sectional view of the electric-vibration converter
B, and FIG. It is sectional drawing which attached electricity-vibration converter B. FIG.
A, B иии Electric-to-vibration converter 1.10 и и и и и и и и и и и и и и и и и 14 и и и и и и и и и и и и 14 и и и и 18 - - - 22 - - 23 - - - magnet pole piece predetermined gap frame vibration exit armature suspension Poisu
coil armature front suspension Ben sucrose rear suspension mounting screws diaphragm
emissions Figure 1 Figure 2 (a) (b)
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