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■ Electro-acoustic transducer ■ Japanese Patent Application No. 44-42224 [Phase] Application
No. 44 (1969) May 29 @ inventor Fukuyama Kokubunji City Higashimotomachi 3 of 20 Rion Co.,
Ltd. Kunitoshi Muramura ■ Application Application Rion Co., Ltd. Kokubunji City Higashikucho 3
4 of 20,
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the
electroacoustic transducer according to the present invention, and FIG. 2 is an exploded view of
the same.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement
of an electromagnetic electroacoustic transducer. The transducer according to the invention is
structurally compact, has a U-shaped armature, makes balancing of the armature and the pole
very easy, and provides a novel electroacoustic transducer. DESCRIPTION OF THE PREFERRED
EMBODIMENTS The present invention will be described with reference to the embodiments of
the drawings. Reference numerals 4 and 5 are magnets, and a magnet 4 provided inside the bent
portion has a screw hole 6 at the center and is screwed with a screw 1 made of a magnetic
material. The magnets 4 and 5 adhere to the substrate. A U-shaped armature 8 is welded to one
end of the U-shape on the outside of the bent portions 2 and 3 of the substrate 1. A rod 9 is used
to couple the diaphragm 10 and the armature 8. Reference numeral 11 denotes a coil, in which a
vibrating end 12 of a U-shaped armature 8 is loosely penetrated. Reference numeral 13 denotes
a hole through which the screw 7 passes. 14はケースで15はそのふたである。 The substrate
1 is fixed to the case 14. The numeral 16 is an electrode terminal and the numeral 17 is a blind
canal to make sound (ear on (microphone)). A sound hole pipe 18 connects the diaphragm 10
and its back surface and is fixed to the case [111111] 14. A screen 19 has an angular hole 20 at
its central portion through which the rod 9 freely passes, and this screen 19 is an acoustic
resistance element capable of adjusting the back pressure of the diaphragm 10. The screen 19 is
bonded to the substrate 1. Reference numeral 21 denotes a hole through which the rod 9 passes.
The bent portions 2 and 3 have semicircular cutouts 22.23 through which the screws 7 pass. 24
is adhered to the substrate 1 with a square frame for attaching the diaphragm 10. The coil may
be fixed to the substrate 1 or may be fixed to the case 14. The operation of the electroacoustic
transducer will be briefly described. When used as a microphone, the sound reaching the
diaphragm causes the diaphragm to vibrate, the vibrating end 12 of the armature vibrates, and
thus the magnetic flux inside the armature changes, and the coil It is induced as a current. In the
case of the earphones, the voice current is supplied to the coil in the opposite direction, the
magnetic flux in the armature is changed, the armature is vibrated, and the diaphragm is vibrated
to generate sound. The above is a general operation, but the characteristics of the converter
according to the present invention are as follows: In the gap 25 where the magnets 4 and 5 face
each other, there is the vibrating end 12 which is one end of the U-shaped armature 8 It is
necessary to magnetically balance the 120 faces and the opposing surfaces 26 and 27 of the
magnet at equal intervals, but in the past it has been very difficult to balance this, but the magnet
of the present invention Even if the distance between the opposite surface 26.27 of the above
and the both sides of the vibrating end 120 of the armature 8 is slightly different, after final
assembly, the screw 7 can be adjusted to easily achieve magnetic balance.
When used as an earphone, etc., a direct current may be applied to the coil, and an optimum
balance can be achieved while operating. ■ U-shaped I) The fixed end 28 which is one end of the
armature 8 is welded to the bent portion of the substrate 1, so that the fulcrum portion (welded
portion) [111111] EndPage: 1 of the armature 8 is independent of the case 14 It is very strong
against vibration compared to the conventional one. {Circle over (3)} It is a structure in which the
screen 19 can be simply provided, whereby the characteristics of the converter can be adjusted.
(2) The structure can be made extremely small, and the prototype can be made 4.7 × 8.8 × 5.0-.
As described above, the electro-acoustic transducer according to the present invention is easy to
adjust, is strong against vibration, is isometric (is short in size, and its action and effect are large.