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The present invention relates to improvement of a diaphragm used for a speaker. Many speakers
using a flat diaphragm have been proposed. FIG. 3 is a drawing of a regular square flat plate @
moving plate shown as a representative example thereof. In general, N (N: 3 or more positive
integer) rectangular flat plate diaphragms have a drawback that the sound pressure level of peak
and dip is large in the middle pressure range and the high frequency range particularly on the
sound pressure frequency characteristic. Efforts have been made in the past to select vibration
plate materials having physical properties with large mechanical vibration loss in order to
compensate for the defects. Today, a flat plate-shaped diaphragm with a honeycomb structure is
proposed as a material that is light and has a large mechanical vibration loss, but still it is
considered that the sound pressure level of peak and dip on the sound pressure frequency
characteristics has been sufficiently eliminated I can not say. The N-shaped flat diaphragm
according to the present invention is made based on a new technical idea different from the
direction in which the material of the diaphragm is improved so far, and it is possible to add
weight to each town of the N-shaped flat plate It is the thing of the composition characterized by
having added. Hereinafter, the present invention will be described using examples. [Conventional
Example] A flat plate of a honeycomb structure is used as a diaphragm material. This flat plate is
made into the square plate 1 whose side is 10>. Corrugated zinc edges 3 are stuck around the
square plate 1. Furthermore, the voice coil 4 is set up at the center of the square plate l.
[Example] of the diaphragm of the same type as the conventional example, two diagonal lines of
the square plate l and four corners of the point of intersection of the radius 6.2 (-m circle) from
the center of the square plate l An epoxy resin adhesive is added by adhesion as 0 ° 52 r 9
weight 2.2, 2.2. When the diaphragm shown in the conventional example and the square flat
diaphragm in the embodiment are respectively assembled into speakers and the sound pressure
frequency characteristics are measured, the characteristics shown in FIG. 2 are obtained. In the
example, the average sound pressure level (note: the average level value of 300 Hz, 400 Hz, 500
Hz, 600 Hz (IJ) sound pressure) is about 1 dB lower than that of the conventional example. Sound
pressure frequency characteristics of [2] peak characteristics shown in P], P2. Dip characteristics
Dl. D2 does not appear on the sound pressure frequency characteristic of the embodiment, and it
can be said that the sound pressure frequency characteristic is flattened. As described above, the
sound pressure frequency characteristics can be flattened by adding a heavy material to the can
of the N-shaped flat plate in the N-shaped flat diaphragm of the present invention.
Brief description of the drawings
FIG. 1 is a drawing showing an embodiment of the present invention, FIG. 2 is a sound pressure
frequency characteristic chart, and FIG. 3 is a drawing showing a conventional example.
■ · · · Square board, 2 · · · · · · · · · · · · · · · · · · · · · voice coil. Figure 1 Figure 2 Figure 3 same
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