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JPS5769377

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5769377
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing an
embodiment of the speaker according to the present invention, and FIG. 2 is a schematic crosssectional view showing an enlarged main part of FIG. It is a sound pressure frequencycharacteristics figure for demonstrating the effect of an Example. 12.13 ... diaphragm, 18.19 ...
bobbin, 20.21 ... voice coil, 22 ... permanent magnet, 23 ... yoke, 24 ... pole piece, 25 ... Pole piece
and plate, 26 ... through hole.
DETAILED DESCRIPTION OF THE INVENTION This discussion relates to a speaker, and more
particularly, to an improvement of a magnetic circuit for driving a diaphragm in a space. For
example, in a coaxial speaker in which a plurality of imaging plates are coaxially disposed, a
magnetic circuit capable of efficiently driving a sliding plate with an open structure and an
efficient structure has been strongly demanded. . It is of course intended that this consideration #
can meet the above-mentioned request, but also provides a single speaker capable of illustrating
the flattening of the sound pressure frequency characteristic on a rough basis. An embodiment of
the present invention will be described in detail below with reference to the drawings. FIG. 1 a1
is a schematic cross-sectional view of a so-called two-in-one coaxial type speaker having, for
example, two imaging plates for regenerating 1 stuttering and middle and high-pitched sound
reproduction. In the figure, 11 is a frame, 12 is a bass reproduction diaphragm, 13 is a middle
and high-tone reproduction imaging board, 14.15 is an outer peripheral edge of the imaging
board 12, 1.1, respectively, and 16 is the same as the inside of the diaphragm 12. The support
18.19 of the outer edge 15, the inward edge 16 is connected to the imaging plate 12.13,
respectively, and the 20 ° 21 is the I bin. It is a discoil wound around a bin 111.19. Here, the
magnetic (R) path part will be described. 22 is a permanent magnet, 23 is a yoke, 24 is a pole
piece, and 25 is a pole piece and a gear. The permanent magnet 22 has a through hole 26 at a
substantially central portion of the pole face, and the pole piece 24 is positioned to be inserted
into the through hole 26. Then, the discoil 20 currently provided to the bobbin 18 is disposed in
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the space p) Jz7 between the outer peripheral surface of the pole piece / grate 25 provided on
the upper surface of the permanent magnet 22 in the drawing and the inner peripheral surface
of the upper end in the yoke 230. I am jealous. 2pJl 8 VC between the inner circumferential
direction of the pole piece / great 25 and the outer periphery of the upper part in the figure of
the pole piece 24 in the housing. A discoil 21 wound in a bin 19 VC is used. In the above
configuration, the yoke 23, the pole piece 24 and the pole 25 form a magnetic circuit, and the
yoke 23 and the pole 25 form a second magnetic circuit. Then, assuming that the magnetic poles
of the permanent magnet 22 are set as shown in the drawing, magnetic paths in the directions
indicated by the arrows X, X are formed. Then, the diaphragm 13 is pivoted by the magnetic flux
passing all the magnetic paths in the direction of the arrow Xl, and the diaphragm 12 is driven by
the magnetic flux passing through the magnetic path in the direction of the arrow X2. According
to the groove bottom, the two diaphragms 12.13f can be pivoted by one permanent ball 22.
Therefore, the miniaturization of the speaker and the reduction of the manufacturing cost can be
achieved.
Further, since the through hole 26 is provided in the permanent ball 22 and the air intake circuit
is formed on the outer peripheral side with the through hole 261 rule, the magnetic flux
generated from the permanent magnet can be effectively utilized. The two diaphragms 12.13 can
be driven sufficiently efficiently. Next, the features of the present invention will be described with
reference to FIG. In this invention, the feature M is included in the winding method of the coil
20.21 for n = r bin 18 ° 19. That is, as shown in FIG. 2 (& coil 22.21 is Novin 1 g. It is wound in
the opposite direction to 19. According to the above configuration, the following effects can be
obtained. That is, in the case of the configuration as shown in FIG. 1, the magnetic directions in
the air gap 21. 28 are opposite to each other as described above. Therefore, when the discoils 20
and 21 are made 1-ol in the same direction, the diaphragms J2, 1,. In the case of vibrating in the
opposite phase and dividing the holding band for each diaphragm 12 and 13, as shown by the
actual figure (A) in the sound pressure interval mantissa characteristic diagram of FIG.
Disturbance occurs in the sound pressure frequency characteristics near the frequency. In order
to prevent this, it is sufficient to use a reverse phase when using the outside from the outside, but
this method has the disadvantage that it is likely to cause confusion on the wiring of the circuit.
Therefore, if the winding direction of the discoil 20.21 is set in the opposite direction as in this
embodiment, it is possible to vibrate the diaphragm 12 ° 13t-in-phase without changing the
wiring of the circuit at all. The sound pressure frequency characteristics in the vicinity of the
crossover / stationary wavenumber can be flattened as indicated by broken lines in FIG. Thus,
according to the present invention, it is possible to provide a speaker capable of simplifying the
structure and efficiently (in addition to the ability to move aJ, and further flatten the sound
pressure frequency characteristics).
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