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JPS5518845

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DESCRIPTION JPS5518845
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
electromagnetic electro-acoustic transducer, and FIG. 2 is a cross-sectional view showing an
embodiment of the electromagnetic electro-acoustic transducer of the present invention. 9 ииииии
Frame, 10 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ? 14 ...... inclined portion,
15 ... ... flat portion 16 ...... magnet 17 ...... driving coil, 18 ...... amateur, 20 ..... Drive pin.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an
electromagnetic electroacoustic transducer which has been thinned by applying an improvement
to a base plate. ? I ? ? ?, Ц-?? Hunso-2 As a conventional electromagnetic electroacoustic
transducer, it was configured as shown in FIG. That is, a base plate 2 made of a magnetic metal
plate formed in a U-shape is incorporated into the inside of a frame 1 formed in a container
shape with an open upper surface, and a magnet is provided between the bottom surface of the
frame 1 and the lower surface of the base plate 2 3 and 1 drive coil 4 is assembled, and one end
of an armature 5 made of a magnetic plate is connected to the end of the base plate 2, and the
free end of the armature 6 is placed between the magnet 3 and the drive coil 4 A conical
diaphragm 8 mounted so as to be positioned, the drive pin 7 coupled to the free end of the
armature 5 so as to penetrate the central through hole 6 of the base plate 2, and the peripheral
edge being affixed to the frame 1 etc. One end of the four drive pins 7 is coupled to the center of
the. In such a configuration, the free end of the armature 5 is normally located at the center of
the madai soto 3 and the drive coil 4, but when a signal is applied to the drive coil 4, the suction
balance is lost and the amary is not -) The free end vibrates, and this vibration is propagated to
the B- "3 diaphragm 8 through the drive pin 7 to vibrate the diaphragm 8 and generate a sound
according to the vibration. There is. In the electromagnetic electro-acoustic transducer of the
above configuration, the upper surface of the base plate 2 is flat, so the height of the base plate 2
plus the height of the inverted conical diaphragm 8 is the total height. , Was quite high, ie thick.
In the recent audio equipment, there is a tendency of becoming thinner, and in order to respond
01-05-2019
1
to this tendency, it is necessary to make the electromagnetic type electroacoustic transducer
thinner. However, with the conventional electromagnetic type electroacoustic transducer
described above, thinning is difficult and it has not been possible to meet the demands of the
times. The present invention is intended to eliminate the above-mentioned conventional
drawbacks and to provide an electromagnetic electroacoustic transducer which fully satisfies the
needs of the times. Hereinafter, one embodiment of the present invention will be described with
reference to FIG. 9 is a frame 4.-4.74 formed in the form of a container with an open top by a
metal such as aluminum or a synthetic resin, and in this frame 9, a downward falling piece 1o is
formed at the periphery. A base plate 11 made of a cap-like magnetic metal is incorporated. On
the upper surface of the base plate 11, an upward pushing portion 12 having a predetermined
width is formed, and the pushing portion 12 is provided at both ends with inclined portions 14
along inclined surfaces of a conical diaphragm 13 described later. Is a flat portion 15.
A magnet 16 and a drive coil 17 are attached between the lower surface of the flat portion 15
and the bottom surface of the frame 9. Further, on the lower surface of the base plate 11
corresponding to the extrusion portion 12, an armature carrier 18 made of an elastic magnetic
material such as permalloy is disposed, one end of the armature 18 is coupled to the upper
surface of the base plate 11, and the other end is The free end is located at the center of the
magnet 16 and the drive coil 17. The other end of the armature 18 is coupled to a drive pin 20
which is more rigid than the hard material projecting above the base plate 11 through the central
hole 19 of the flat portion 16 of the extrusion unit 12. At the upper end, the center of the conical
diaphragm 13 with its peripheral edge connected to the frame 9 or the like) is connected. With
such a configuration, the height from the bottom of the frame 9 to the support 15 of the
extrusion 12 of the base plate 11, that is, about half the height of the magnet 16 and the drive
coil 17 is the diaphragm It will be absorbed to a height of 13 and can be made quite low as the
overall height. As described above, since the electromagnetic type electroacoustic transducer of
the present invention is configured, the overall height can be reduced by nearly% just by adding
a little processing to the base plate, and it becomes thinner. Since it is easy to assemble without
being degraded and can be connected to the upper surface of the base plate of one end of an
armature, it is possible to improve the bonding strength and to improve the workability of
assembly, which is of practical value. It is big.
01-05-2019
2
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