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JPS5568798

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DESCRIPTION JPS5568798
Description 1, title of the invention
Fully driven electroacoustic transducer
3. Detailed Description of the Invention The present invention relates to a full drive electroacoustic transducer mainly adopted for a speaker, a microphone, a pickup and the like.
Conventionally, a full-surface drive type electroacoustic transducer (that converts an electric
signal into sound by vibrating the entire surface of the diaphragm, or converts sound into an
electrical signal to electromagnetic induction by vibrating the entire surface of the diaphragm I
say something. For example, in the case of a speaker as shown in FIG. That is, vibrations # and B
formed flat in a material such as copper, aluminum or the like are disposed in the magnetic air
gap of the magnetic circuit, and the vibration is generated by the magnetic flux from the
magnetic circuit and the 'α flow flowing through the diaphragm B A driving force C
perpendicular to the plate B is applied. However, in this conventional product, the magnetic flux
from the magnetic circuit is applied in the horizontal direction to the moving plate B, but the gap
as the magnetic gap is large, so that the desired magnetic flux density can not be obtained.
Vibration sensitivity and efficiency were poor. Also, in order to obtain a desired magnetic flux
density, a considerably large apparatus is required, which increases the cost. In addition, since
the diaphragm B is flat and thin, structurally weak EndPage: 1 or the like has to be reinforced.
The present invention has been made in view of the above-mentioned points, and the object of
the present invention is to make the diaphragm in which the current flows V-shaped or inverted
V-shaped. It is an object of the present invention to provide a full drive electric sound 4 illi
converter which aims to increase the magnetic flux density by supplying magnetic flux at right
angles to a piece and to improve summer conversion efficiency. Hereinafter, a case where the
present invention is applied to a speaker will be described as one embodiment according to FIGS.
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2 and 3. FIG. 1 is a magnetic circuit, 2 is a yoke constituting the magnetic circuit 1, 3 is a magnet
4y, 4 is a ball fixed to the upper surface of the magnet 3, 5 is made of copper, aluminum etc.
Insulating plate 5C? The diaphragm 5 is formed in a substantially V-shaped cross section by
abutting the left and right component pieces 5a and sk +, and the diaphragm 5 is formed along
the V-tip 4a formed on the upper surface of the ball 4 It is placed as a vent with a slight gap of °
C. Further, the component pieces 5a and 5b form an outward path and a return path through
which current flows. Reference numeral 6 denotes a spacer for supporting the diaphragm 5, and
this spacer 6 is attached to the yoke 2. T is a substantially V-shaped plate formed of a magnetic
material and disposed on the upper surface of the diaphragm 5, and a number of plates for
passing sound through the plate 7. A door 2L is drilled. As described above, the end faces of the
ball 4 and the plate 7 constituting the magnetic circuit are brought close to both sides (upper and
lower in the drawing) of the valley projecting pieces 5a and 5b of the diaphragm 5 in the
thickness direction.
Since one embodiment of the present invention is constructed as described above, the magnetic
flux of the magnet 3 passes from the pin 5 to the ball 4 in the direction perpendicular to the
diaphragm 7. Then, when a current flows in the direction shown in FIG. 3 in each of the
component pieces 5a and 5b of the moving plate 5, the component pieces of V-shaped vibration
# and 5 according to Fleming's law by the current and magnetic flux. A driving force acts on the
5a and 5b in the direction parallel to and in the opposite direction of the temperature. Therefore,
the combined force acts on the diaphragm 5, and it vibrates in the combined direction to radiate
a sound wave to the front of the diaphragm 5 from the large number of slits 7a. In addition, since
the diaphragm 5 is formed to have a substantially V-shaped cross section, the magnetic gap can
be narrowed as compared with the conventional flat diaphragm, and the m-shaped structure is
obtained. FIG. 4 shows another embodiment in the case of application to the speaker of the
present invention. In this embodiment, the diaphragm 5 'itself is formed in a V shape and the
temperature is the same. A different point is that the insulating plate is interposed at the center
of the diaphragm and there is no temperature. The magnetic circuit 1 'has the same
configuration as that of the example of the NU syllabary image except that the magnetic circuit 1'
is formed by the yoke 2 and the magnet 3, and the same parts are indicated by the same
reference numerals. Also in the present embodiment, the magnetic flux flowing to the yoke 3
from the magnet 3 passes through both the components 5'a and 5'b of the diaphragm 5 'in a
direction perpendicular to the temperature of the two plates. When a current flows in the
direction shown in FIG. 4 in each of the constituent pieces 5'a and 5'b of 5, the constituent pieces
s'a * 5 of the V-shaped diaphragm 5 are formed according to Fleming's left law by the current
and magnetic flux. The driving force acts in a direction parallel to 'b and in the opposite direction.
Accordingly, the combined force of the diaphragm 5 'acts on the diaphragm 5', and it vibrates in
the combined direction to emit a sound wave from the multiple sheets 1-7a to the front of the
diaphragm T. EndPage: Two faces, and in the first and second examples of tiiJ, the shape of 蚕 kjJ
寂 5, 5 'is V-shaped, but conversely, the shape of the diaphragm is inverted and the magnetic gap
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is narrowed by ° C. Therefore, the magnetic flux from the magnet of the magnetic circuit passes
perpendicularly to both the left and right component pieces of the diaphragm, and the magnetic
flux density can be increased. In particular, it is advantageous in terms of directivity
characteristics and radiation characteristics in the case where the diaphragm is inverted Vshaped for the speaker. Moreover, although the above embodiments have been described in the
case of application to a speaker, by moving the diaphragm disposed at right angles to the
magnetic flux in the magnetic field in the direction perpendicular to the magnetic flux, the
current is The present invention can also be applied to a pickup having a principle structure of
flowing a current, and in this case, the diaphragm 1a... Increases the magnetic flux density
passing through the slit by making the diaphragm V-shaped or inverted V-shaped. You will be
taken away.
As described above, according to the present invention, the imaging plate through which current
flows is V-shaped or inverted V-shaped, and magnetic flux is given at right angles to each month
of the diaphragm by narrowing the magnetic gap. Thus, the magnetic flux density can be
increased, and the conversion efficiency is improved.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view for explaining the drive
principle of a conventional full drive electro-acoustic transducer, and FIG. 2 shows an example M
of the full drive electro-acoustic transducer of the present invention. FIG. 3 is a cross-sectional
view for explaining the driving principle of the diaphragm, and FIG. 4 is a cross-sectional view for
explanation in another embodiment. 1.1 '... magnetic circuit, 5, 5' ... diaphragm, 5a, 5b: 5'a, 5'b ...
component piece, 7 ... plate, patent applicant Pioneer Corporation 477EndPage : 3 Figure 1
Figure 4 EndPage: 4
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