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JPS62278896

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DESCRIPTION JPS62278896
[0001]
The present invention relates to a flat plate speaker, and more particularly to a flat plate speaker
in which the area of a sound wave emitting hole can be varied to change the amount of bass.
[Prior Art] This type of conventional flat panel speaker is called a so-called "gum-gin type
speaker", and the area of the sound wave emitting hole is fixed as described in Japanese Patent
Publication No. 35-10420. ing. An example of a conventional flat loudspeaker will be described
with reference to FIG. In the figure, 1 is a rear yoke plate, 2 is a front yoke plate, 3 is a columnar
magnet, 4 is a vibrating film, 5 is a multi-layered voice coil, 6 is a frame, and 7 is a sound wave
emitting hole. On the right of this flat plate speaker, when an audio signal is applied to the voice
coil 5, the magnetic field generated in the voice coil 5 acts on the columnar magnet 3 to cause
the diaphragm 4 to move. The sound wave generated by the vibration of the imaging film 4 is
propagated to the outside through the sound wave emitting hole 7. [Problems to be Solved by the
Invention] Since the flat speaker is flat in shape, it can be used as a wall hanging type, ceiling
embedded type, screen type or sub-speaker. In this case, it is necessary to adjust the treble and
particularly the bass in order to use them in the best condition suitable for their usage or use
environment. However, the conventional flat-plate speaker is not considered in terms of bass
adjustment, and there is a problem that the bass adjustment can not be performed in the best
state suitable for the usage method and the usage environment. SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the drawbacks of the above-mentioned
conventional devices and to provide a flat-plate speaker which can be tuned to the best condition
according to the method of use and the use environment. [Means for Solving the Problems] The
above object can be achieved by providing a slide shield capable of changing the area of the
sound wave emission hole of the flat speaker. [Operation] In the flat panel speaker, the sound
wave generated by the vibration of the vibrating membrane propagates to the outside through
the sound wave emitting hole. As the area of the sound wave emitting hole increases, the acoustic
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resistance to the vibrating film decreases. As a result, the width of the diaphragm of the vibrating
membrane becomes large and it becomes easy to emit low tones. Conversely, if the area of the
sound wave emitting hole is reduced, the acoustic resistance is increased. As a result, the
amplitude of the moving film becomes small and the bass becomes difficult to come out.
Therefore, by making the area of the sound wave emitting hole variable, the user can select the
best bass volume according to the method of use and the usage environment. An embodiment of
the present invention will be described below with reference to FIGS. 1 and 2. FIG.
FIG. 1 is a cross-sectional view of a flat panel speaker according to an embodiment of the present
invention, and FIG. 2 is an output sound pressure frequency characteristic diagram of the flat
panel speaker according to the present embodiment. The difference is that a slide shield 8 is
attached to the rear yoke plate 1, and the other structure is the same as that in FIG. The same
reference numerals as in FIG. 3 denote the same parts in FIG. Now, in the flat panel speaker of
this embodiment, when the slide shielding plate 8 is slid to make the sound wave emission hole 7
fully open, the bass frequency characteristic of the flat panel speaker becomes as shown by
reference numeral 9 in FIG. When the slide shielding plate 8 was slid and all the sound wave
emission holes 7 were closed, the bass frequency characteristic was changed as shown by a
reference numeral 11. That is, in the former case, the low volume emitted from the speaker was
the largest, and in the latter case the low volume was the smallest. Further, when the slide shield
plate 8 was slid by an appropriate amount, the bass frequency characteristic was as shown by the
reference numeral 10. As described above, according to this embodiment, the user slides the
slide shield plate 8 to an appropriate position according to the method of use and the use
environment to obtain an appropriate low-pitched sound and listen to music and the like. Can
achieve the best condition. In the above embodiment, the rear shield plate 1 is attached to the
slide shield plate, but the present invention is not limited to this, and may be attached to the front
yoke plate 2 or attached to both of the plates 1 and 2. May be According to the present
invention, since the amount of bass can be adjusted by sliding the slide shield, the user can use
the flat panel speaker in the most appropriate state according to the method of use and the use
environment. It has the effect of being able to
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a flat panel speaker according to an embodiment of the present
invention, FIG. 2 is an output sound pressure frequency characteristic chart showing the effect of
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the present invention, and FIG. 3 is a cross-sectional view of a conventional flat panel speaker.
1 ... rear yoke plate 2 ... front yoke plate 3 ... columnar magnet 4 ... vibrating film 5 ... voice coil 6
of multiple layers ... frame 7 ... sound wave emission hole 8 ...・ Slide shield
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