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JPS54176329

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DESCRIPTION JPS54176329
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a conventional electromagnetic
electroacoustic transducer, FIG. 2 is a side view thereof, FIG. 3 is a bottom view thereof, and FIG.
4 is an electrical device of the transducer 5 is an explanatory view showing the relationship with
the printed circuit board, FIG. 6 is a top view showing an embodiment of the electromagnetic
electroacoustic transducer of the present invention, and FIG. 7 is a side view thereof. FIG. 8 is a
bottom view of the same. 9 · · · Case, io, ii · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · sound
emission hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an
electromagnetic electroacoustic transducer that can be incorporated easily by improving the case
and can prevent the occurrence of errors such as miswiring i, '; j) l, -', Fz-7, 5-: '32 /. 2 As a
conventional electromagnetic electroacoustic transducer. As shown in FIGS. 1 to 3, the sound
output hole 2 is provided on the upper surface of a cylindrical case 1 incorporating a magnetic
circuit and a diaphragm, and two electrodes 3 and 4 are provided on the bottom surface. The In
such a configuration, when trying to connect the electrodes 3 and 4 to the printed circuit board 6
after mounting on the case 5 of the device as shown in FIG. Because 1 is not fixed in the
rotational direction of the circumference and is positioned properly, as shown in FIG. 6, the
mounting hole 8 of the printed circuit board 6 and the electrodes 3 and 4 are offset and can not
be incorporated into the printed circuit board 6 There was a fault. The present invention
eliminates the above-mentioned conventional drawbacks. Hereinafter, an embodiment of the
present invention will be described with reference to FIGS. 6-8. A cylindrical case 9 is made of a
synthetic resin or the like, and in this case 9 is held a magnetic circuit constituted by a plate
having a center pole, a coil, a magnet 2], and the upper end A tubular frame is fixed in which a
diaphragm having a magnetic body disposed to correspond to the magnetic circuit with a fixed
gap is fixed. Grooves 1o and ii in the height direction of the case 9 are formed at positions 180
degrees different from each other on the side surface of the case 9. It is desirable that the groove
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10.11 be a groove different in shape or size from the one having a semicircular shape and the
other having a V-shape, and be provided on a central line connecting the electrodes 12 ° 13
projecting to the bottom of the case 9 . A sound emission hole 14 for radiating a sound generated
by the vibration of the diaphragm is provided on the upper surface of the case 9. By adopting
such a configuration, if a lip matching the groove 10.11 is provided in the mounting portion of
the case of the electric device into which the electromagnetic electroacoustic transducer is
incorporated, the mounting can be performed with a constant direction, Even when the electrode
12.13 is incorporated into the printed circuit board, the mounting holes of the printed circuit
board completely match, and the assembly can be performed simply and reliably. Therefore, it is
possible to prevent the polarity of the electrode 12.degree. 13 from being mistaken. 0 ') As
described above, the electromagnetic electroacoustic transducer of the present invention is
composed of four elements, so that it is easy to incorporate, and it is possible to prevent wrong
electrode polarity during incorporation, and it is possible to improve the quality etc. It is obtained
and has great practical value.
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