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JPS63224590

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DESCRIPTION JPS63224590
[0001]
TECHNICAL FIELD The present invention relates to a speaker used in various acoustic products.
Conventional Technology A conventional external-magnet-type electrodynamic speaker has a
configuration as shown in FIG. That is, the doughnut-shaped magnet 2 is joined onto the pole
piece attached plate 1, the top plate 3 is joined to the magnet 2, and the magnetic gap 6 is
constituted by the pole piece 4 and the top plate. In the magnetic gap 5, the wire ring 9 of the
voice coil 8 held by the damper 7 fixed to the frame 6 is disposed so as not to touch the
circumference. The diaphragm 1 o is joined to the voice coil 8, and the outer periphery of the
diaphragm is joined to the frame via the edge 11. Further, in the vicinity of the center of the
diaphragm, a dust cap 12 is joined in order to prevent dust from entering the magnetic gap. The
above is the structure of a general electrodynamic speaker. FIG. 4 shows a speaker made for the
purpose of improving the directivity characteristic of the conventional speaker. This is different
from the conventional loudspeaker in the arrangement of the diaphragm 1o, and the center of
the diaphragm 1o is configured to project from the outer periphery of the diaphragm. In the
speaker configured as described above, since the interference at the listening point of the sound
from each portion of the diaphragm 10 is smaller than that of the general speaker, a speaker
having good sound diffusion can be obtained. Problems to be Solved by the Invention However,
the application of the speaker having such a configuration utilizes listening goodness of sound,
and listens to such as in-vehicle door speaker, sound field reproduction speaker for high / light,
etc. The point where the point is not on the central axis of the speaker is mainly. Therefore, in
these applications, the speaker is required to have a flat sound pressure-frequency characteristic
in one direction in the direction of the listening point, and flat sound power in other directions,
for example, suitable for sound field reproduction. It is a matter of However, conventional
speakers. In a loudspeaker having a circular or elliptical diaphragm shape, the cross-sectional
shape in the radial direction of the diaphragm is the same across a plurality of locations, so it is
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not possible to obtain specific sound pressure-frequency characteristics in only one direction
described above It has a drawback. The present invention is intended to provide a speaker that
can solve this problem. In the present invention, therefore, at least one portion in which the
cross-sectional shape in the radial direction of the diaphragm is completely different from the
other portions is provided. The speaker having such a configuration has a diaphragm shape
different from other portions in a specific direction. The sound pressure-frequency characteristic
in this direction can be differentiated from other parts to be a desired characteristic.
Embodiment FIG. 1 shows an embodiment of the present invention. That is, the magnet 2 is
joined onto the pole piece attached plate 1, and the top plate 3 is joined to the magnet 2. In the
magnetic gap 6, the wire ring 9 of the voice coil 8 held by the damper 7 fixed to the frame e is
arranged so as not to touch the circumference. The diaphragm 10 is bonded to the voice coil 8,
and the outer periphery of the diaphragm is bonded to the frame 6 via the edge 11. A dust cap
12 is bonded to the end of the voice coil 8. Here, the left half of the diaphragm 10 is the basic
diaphragm shape 10 & the other half 10 b of the right half. The respective sound pressurefrequency characteristics are shown in FIG. The main purpose of the basic diaphragm 101 is to
reproduce the sound field, so that the reproduction band is 10 KH 2 or less, and the reproduction
band is set to 16 sec. 2 because it is a portion of the irregular shaped part of the diaphragm 1 ob
Fi listening direction. The characteristics are directivity characteristics in the 46 ? ? direction.
The importance of sound field reproduction has been recognized in recent years, and in order to
ideally reproduce the sound field, coaxial speakers with the central axes of the two speakers
inclined, and the central axes of the speakers are similarly inclined. However, the speaker Fi of
the present invention is an epoch-making one that can replace these multiple speakers with a
single speaker. It is a great invention of industrial value that can have a great effect on
downsizing and cost reduction.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of the speaker according to the present invention, FIG. 2 is a sound
pressure-frequency characteristic diagram in the 46 ░ direction of the speaker according to the
present invention, and FIG. 3 is a cross-sectional view of an electrodynamic loudspeaker of a
general external magnet type FIG. 4 is a cross-sectional view of a speaker with improved
directivity.
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1 и и и и и и и и piece with a flat piece, 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
Damper, 8 ииииии Voice coil, 9 иии Voice coil wire ring, 10 &. 10b ииииии Diaphragm. Name of Agent
Attorney Nakao Toshio 1 other 1- With pole piece 6-Frame 12- Tust cap Fig. 2 IK 5K lax 2! The
role of the Ox peripheral fluid Fig. 3 Fig. 4
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