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JPS58106998

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DESCRIPTION JPS58106998
[0001]
The present invention relates to an electromagnetic acoustic transducer used for a hearing aid or
the like, and provides an electromagnetic acoustic transducer capable of checking the
performance such as stiffness of only the diaphragm portion before assembly. In the
conventional electromagnetic acoustic transducer used for hearing aids and the like, the
diaphragm itself is a part of the magnetic circuit, or the diaphragm is formed integrally with the
drive unit, so the drive unit and the diaphragm unit are separated It was impossible to
independently check the performance of the drive unit and the diaphragm unit. For this reason,
even if either one of the drive unit and the diaphragm portion is defective, the entire converter is
defective, which is a major obstacle to the stabilization of the quality and the reduction of the T
number. The present invention eliminates the above-mentioned conventional drawbacks, and one
embodiment of the present invention will be described below with reference to the drawings. In
FIGS. 1 to 4, reference numeral 1 denotes a rectangular case whose upper surface is open, and
the case 1 is made of a magnetic material. 2, 2 'are holes formed on one side of the case 1. A lid 4
for covering the top opening of the case 1 is a notch formed on one side of the lid 3. The lid 3
and the case 1 constitute a rectangular container. Reference numeral 6 denotes a plate-like
member formed by bending a metal plate. The plate-like member 5 includes a substrate 6 and
side plates 7 and 7 'extending in parallel from both ends of the substrate 6; It comprises an
armature 8 extending from the central portion of the substrate portion 6 to the side plate portion
7.7 '. 9 is a small hole formed in the armature 8. 1 ° is a coil, and the coil 10 is adhered to the
inner surface of the side plate portions 7, 7 'of the plate-like member 5. The armature 8
penetrates the central hole of the coil 10 without contacting the coil 1 o. Reference numeral 11
denotes a rectangular cylindrical yoke made of a magnetic material. Plate-like magnes 12 and 12
'are fixed to opposing surfaces inside the yoke 11, respectively. The tip inner surfaces of the side
plate portions 7 and 7 'of the plate-like member 5 and both side surfaces of the yoke 11 are fixed
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1
by spot welding or adhesion to form a drive unit A) (FIG. 4). In the state where the plate-like
member 5 and the yoke 11 are fixed, the end of the armature 8 is inserted between the magnets
12.12 'so as not to contact the magnets 12 and 12'. The lower surface of the yoke 11 of the drive
unit A is fixed to the bottom surface of the case 1. Reference numeral 13 denotes a frame, and a
hole 14 is formed on the bottom of the frame 13, and a vibrating film 15 is heat-sealed on the
upper edge of the frame 13.
A diaphragm 16 is fixed to the upper surface of the diaphragm 16 by heat fusion, and the
diaphragm 16 is formed of a light metal plate such as aluminum. Reference numeral 17 denotes
a small hole formed in the diaphragm 16. Said frame 13. Vibrating membrane 15. The diaphragm
16 and the diaphragm 16 constitute a diaphragm unit B (FIG. 4). The diaphragm unit is fixed to
the upper surface of the yoke 11 of the drive unit. The reference numeral 18 denotes a drive pin,
one end of the drive pin 18 is inserted into the small hole 9 of the armature 8, fixed by bonding
or spot welding etc., and the other end of the drive pin 18 is still the diaphragm 16 And inserted
into the small holes 17 of the A sound hole pipe 19 is fixed to the side surfaces of the case 1 and
the lid 3 so as to cover the notch 4 of the lid 3, and a terminal plate 2 o is fixed to the other side
of the case 1. Are connected to the terminal plate 20 through the holes 2.degree. Next, the
operation of the above embodiment will be described. A magnetic circuit is constituted by the
magnets 12 and 12 'and the yoke 11, and a DC magnetic field is generated between the magnets
12.12'. Here, when a signal is applied to the coil 10, an alternating magnetic flux is generated,
and this alternating magnetic flux is transmitted to the armature 8. An AC magnetic field is
generated between the magnet 12.12 'and armature 8 by flowing through a magnetic circuit
consisting of magnet 12.12', side plate portion 7.7 'of yoke 11 ° member 6, and substrate
portion 6 of member 6. As a result of the magnetic field being superimposed on the DC magnetic
field, the armature 8 vibrates. The vibration of the armature 8 is transmitted to the diaphragm 16
via the drive pin 18, and the diaphragm 16 vibrates and a sound wave is emitted. This sound
wave is cut out of the lid 3 4. It reaches the ear through the sound hole pipe 19 and further
through the ear tip (not shown). The present invention is configured as described above, and the
diaphragm unit and the drive plate unit are separated, and each unit is assembled separately, so
that the assembling workability is good and the performance of each unit only. In particular, it is
possible to check the stiffness of the diaphragm unit, and by combining both non-defective units,
there is an advantage that an acoustic transducer with stable performance can be obtained.
[0002]
Brief description of the drawings
[0003]
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1 and 2 are sectional views of an electromagnetic acoustic transducer according to an
embodiment of the present invention, FIG. 3 is an exploded perspective view of the transducer,
and FIG. 4 is a drive unit and a diaphragm of the transducer. It is a perspective view of a unit.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · plate-shaped Member, 6 · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · small hole, 10 · · · · Coils 11,... Yoke,
12.12 '... .. Magnets 13, ........ Frames 14, .. .. Holes, 16 ... Vibration Membranes 16,..., Diaphragms,
17 ... small holes, 18 ..., drive pins, 19 ... sound holes, pipes 2 o .. Terminal board.
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