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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional full-drive acoustic
transducer, a is a back view of a diaphragm, a mouth is a longitudinal sectional view of the
transducer, and FIG. 2 is an embodiment of the present invention. A is a schematic plan view, a
mouth is a schematic side view, C is a back view of the diaphragm, and 2 is an operation
explanatory view. 7 · · · · · · · Magnet, 8, 9, · · · · · · · · · Yoke, 10, E · · · diaphragm, 14 · · · · shock
absorber. "Back" = 鳳 -69-Japanese Utility Model Application Publication No. 51-312228 (2) Fig.
2 (mouth) (No \) (2)-70-
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a full drive acoustic
transducer in which the yoke is also used as a diffuser. In the conventional full-drive acoustic
transducer, as shown in FIG. 1, a flat diaphragm 121 on which the die coil 10 is printed on the
back surface is the spacing member 13). (3 ′) K, therefore, the magnet support plate (4) · (4) is
an intermediate member and the magnet support plate (4) · (49 is an Alnico etc. magnet (5) · (6
The voice coil illK is provided so that it does not face in history so that one and the same pole
face each other alternately in all strangeness, and the sound wave emitting holes (4 &) (4'a) are
bored. The voice current flows in the same direction as the arrow ta in the coil 111, and the
magnetic flux from the magnet (5) ON to the other magnets (6) crosses at right angles to the
direction in which the voice current flows. Because of this, according to Fleming's left hand
method jlllK, the imaging plate (2) picks up in the direction of arrow taI (c ') which is
perpendicular to the plane, and this vibration causes the acoustic wave to be emitted according
to the voice current. (4m) · (4'a) comes to be emitted し か し However, this conventional acoustic
transducer requires a plurality of magnets, and the directivity is too sharp, and further from the
disposition of the magnets There is a disadvantage that the area of the acoustic radiation hole is
limited, and an acoustic mass is generated in the gap to cause disturbance in the frequency
characteristic. Therefore, this invention arrives at such a point, and extends a fin-like yoke from
both poles of the magnet, making this yoke a diffuser and printing a voice coil on the side of this
yoke. A full-drive acoustic transducer that can improve the conversion vehicle without being
limited by the thick-peninsular magnet by interposing a plate, and the advantage of full-surface
drive can be inserted and inserted and its directivity can be excellent. Is to provide. In the
following, the embodiment will be described with reference to FIG. ) And (7) are magnets made of
ferrite, alnico, etc. From their poles, yokes (8) and (9) made of soft magnetic material with small
magnetic resistance are extended, and the tips of the yokes (8) and (9) A plurality of fins UO-O
made of soft magnetic material for a magnetic pole and a diffuser are extended to the ridge.
Then, the fins α0 · I are arranged radially so as not to be opposite to each other in the positional
relationship of the inner end portions, and a wavy diaphragm in which a voice coil is printed in a
rectangular shape between the fins 鱈 · 00 U is located via a relaxation agent α 4 t − such as
maltobrene. The positional relationship of the waved diaphragm (solar) to the inner end of the fin
ao-an is such that the valley portion is opposite to the fin 4 and the trace, and also the voice coil
and all (lza)!
It is located on the slope and is designed not to face 74's and U's. Incidentally, the end of the
diaphragm 00 is fixed by a flat chamber member (not shown). In the above, when the voice coil
(a positive and negative voice current flows in 12 (in FIG. 2) and in the direction perpendicular to
the paper ii8), this current is perpendicular to the magnetic flux flowing from the fin 4 to the B
pole which becomes the N pole and the Q Q The diaphragm a3 receives an electromagnetic force
according to Fleming's left law in a direction parallel to its inclined portion, but the composite
vector of this electromagnetic force is a vector in a direction perpendicular to the average teeth
of the entire diaphragm 0 Become. Accordingly, the peristaltic plate (K) vibrates in the direction
of the arrow ((turn) · Buddha ') to become K. Because of this, from the front surface and the
surface of the diaphragm, a sound wave corresponding to the I) signal is emitted. At this time,
since the fins U also act as a diff user other than the magnetic flux supply, the sound waves
spread in the hip direction, and the directivity is also broadened. -In the above, the fins α · · · 111
are not limited to the shape shown in the figure, and may be KIIII like a conventional acoustic
lens, and the diaphragm ringing is limited to a wave shape, and as a microphone other than the
speaker Also available. That is, in the present invention, a plurality of fin-shaped yokes are
extended from both poles of the magnet, arranged alternately so that the inner end portions of
the yokes do not face each other, and voice coils are printed between the yokes. -It is also ○ that
the tug board was interposed. According to J961 Near 3, it is possible to use Fin ° as a diffuser
as well, so it is possible to select directivity without using paper material, and since only one
magnet is required, it is not subject to its thick IC limitation. , King of gear two l! It is possible to
obtain a round-off capable of converting a magnetic flux into a cross magnetic flux, and an
electric precursor converter having a good conversion efficiency, and further, the features of the
entire drive system can be exhibited without any sacrifice.
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