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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a rear view showing a conventional speaker,
FIG. 2 is a sectional view of the same, FIG. 3 is a rear view showing an embodiment of the
speaker of the present invention, and FIG. FIG. 5, FIG. 5, and FIG. 6 are cross-sectional views of
cylindrical windows in another embodiment. 13 ······ Magnetic circuit, 18 · · · · · · · · · · · · · · · · · · · · · ·
· · · · · cylindrical frame portion, 21 · · · · diaphragm, 22 · · · · · · voice coil, 25 ······· Bend part
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker for use
in vehicles, etc., and improves the frame to prevent the inflow of water from the direction
orthogonal to the central axis of the speaker, and the sound pressure frequency. It is intended to
provide stable characteristics. A conventional speaker embedded in a car door or the like is
configured as shown in FIG. 1 and FIG. That is, a plate having a center pole 1! The frame 7
provided with the window hole 6 in about half space is coupled to the magnetic circuit 6
constituted by the ring magnet 3 and the ring top plate 4 as well. The gasket 8 and the
peripheral portion of the diaphragm 90 are bonded to the peripheral portion by bonding or the
like, the voice coil 10 is connected to the central portion of the diaphragm 9, the middle portion
of the voice coil 1o is held by the damper 11, and the voice coil The lower part of 10 is inserted
into the magnetic cap of the magnetic circuit 6 without eccentricity, and the dust camp 12 is
pasted on the central upper surface of the diaphragm 9. And this speaker is used by
incorporating it in a car door etc. with the part without window hole 6 upwards, but since the
window hole 6 is not uniformly formed in the frame 7 as a speaker, the sound pressure
frequency characteristic is Peaks and dips, and there was a drawback that faithful reproduction
was impossible. The present invention eliminates the above-mentioned conventional drawbacks.
An embodiment of the present invention will be described below with reference to FIGS. 3 to 6 of
the drawings. First, in FIGS. 3 and 4, reference numeral 13 denotes a magnetic circuit, and the
magnetic circuit 13 is a plate having a center ball 14 and a plate 15. A ring-shaped magnet 16 °
is also constituted by a ring-shaped upper plate 17. A frame 18 is coupled to such a magnetic
circuit 13. The frame 18 is provided with a plurality of cylindrical window portions 19 by
extrusion which project outward over the entire area of the frame 18 and which project in the
central axis direction r of the speaker at equal intervals. A gasket 20 and a peripheral portion of
a diaphragm 21 are bonded to the peripheral portion of the frame 18 by bonding or the like, and
a voice coil 22 is coupled to the center of the diaphragm 21. The middle portion of the voice coil
22 is a damper The lower part is held in the magnetic gap of the magnetic circuit 13 without
eccentricity. --- In addition, a dust character 24 is attached to the central upper surface of the
diaphragm 21. Also, as the configuration of the cylindrical window portion 19, as shown in FIG.
Providing a bent portion 25 bent or providing a bent portion 26 bent outward at a right angle to
the tip as shown in FIG. 6 to prevent rain and water from entering more reliably You can also.
As described above, the speaker according to the present invention is configured, and therefore,
when it is used by being embedded in a car door or the like, the cylindrical through-hole 19 of
the frame is parallel to the central axis of the speaker even if rain or water drops in Because it
projects in the direction, it can be prevented from flowing into the speaker, and moreover, in
operation, the window on the back of the diaphragm is equally provided with the window holes,
so the pressure on the back of the diaphragm becomes uniform, The sound pressure frequency
characteristics do not have peaks or dips, and can be extremely flat characteristics, and faithful
reproduction is possible.
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