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Description 1; Title of the Invention Planar Drive Type Loudspeaker (1) A plurality of flat
diaphragms and a joined body having a smaller stiffness compared to the above-mentioned
diaphragm which mutually connects a diaphragm and the diaphragm, and the diaphragm And a
driving device for driving each of the plurality of flat-type speakers.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a flat drive type speaker,
and more particularly to a speaker for reproducing a low frequency sound which drives a
diaphragm of 4 IJC large box by a plurality of drive devices. A speaker constituting the final stage
of the sound reproduction system is required to reproduce a sound pressure of about 110 dB 8
PL at maximum sound pressure. In the case of a loudspeaker having a commonly used
diaphragm, its vibration amplitude is inversely proportional to the area of the diaphragm and
inversely proportional to the square of the frequency. For this reason, in a speaker intended for
bass reproduction, a large-area diaphragm with small vibration amplitude is used to reduce nonlinear distortion due to increased amplitude, and this is driven by a plurality of driving devices (,
+: chair coil and magnet) It is effective. However, in the case where a diaphragm having a large
area is integrally formed in this type of speaker, there are the following major problems in
addition to the problem 4c. That is, a large-area diaphragm is uniformly driven as a whole and
there is no problem as long as it completely carries out a bistono (translational) movement, but in
reality there is a small amount because ■ the diaphragm is integrated. Mechanical strain). □ ■
Since the diaphragm is also integrally formed, the displacement during vibration is concentrated
on a specific part (lIh mechanical stress concentration). (5) EndPage: 1 Due to so-called local
vibration or the like generated in a local portion of the diaphragm, the large-area diaphragm
bears a substantially high harmonic and subharmonic signal distortion with respect to the input
signal in practice. Also, as a matter of course, these phenomena become more pronounced as the
input signal becomes larger, making hi-fi reproduction difficult and often generating a piling
noise, so this type of speaker has not been put to practical use. Therefore, in order to improve
this point, a plurality of moving plate units q11 are supported by the frame (2) as shown in FIG. 1
and (B) IC in the prior art, and a speaker with a large area is equivalently constructed. Was
considered. However, as shown in FIG. 2, although such a speaker can reduce harmonic
distortion, since the diaphragm unit and the moving plate unit are supported and fixed by the
frame, the efficiency as the speaker is slightly deteriorated. In addition, interference occurs
between the diaphragm units at the time of high-pitched sound reproduction, resulting in
deterioration of sound pressure frequency characteristics, and of course there is a drawback that
directivity is deteriorated. The present invention has been made in view of such a point, and
reduces harmonic distortion and flicker without degrading the efficiency of the speaker and
without degrading the sound pressure frequency characteristic due to interference between the
diaphragms. It is an object of the present invention to provide a flat drive type speaker for
reproducing low-pitched sounds.
That is, according to the present invention, a large-area diaphragm formed by connecting a
plurality of relatively large rigid diaphragms by a relatively low-rigidity joint is configured to be
driven by a plurality of driving devices. The invention will now be described in detail with
reference to the drawings. 3) is a plan view showing an embodiment of the present invention and
the same drawing) is a cross-sectional view thereof. In the figure, the diaphragm unit 0 は is
constructed using, for example, pulp or various foam molded products, various composite
materials using paper or cloth, and a plate having a sandwich structure of a rigid material such as
a metal plate and a viscoelastic material. Is a relatively rigid diaphragm. The plurality of
diaphragm units (b) are connected by a relatively low-stiffness joined body (2) such as urethane
foam cloth, non-woven fabric, felt 1, rubber-based polymer material, etc. Each of the diaphragms
has a large area. The diaphragm is supported and fixed by the frame. On the other hand, the
drive device for driving this diaphragm (the highest) gives a magnetic field crossing the voice coil
and the second voice coil that are attached to the diaphragm in the same way as the drive of a
normal dynamic speaker. It consists of a magnet (2) and a yoke (至) and a damper (至) that
vibrates the diaphragm completely stably, and it is provided corresponding to each drive unit c
and each diaphragm unit (2) (・) As shown in tX 4, the speaker thus configured can absorb static
and dynamic mechanical distortions generated in the diaphragm by the relatively low stiffness
joint (2). The harmonic distortion can be further reduced as compared with the conventional
speaker. However, this characteristic is obtained when pulp is used for the diaphragm unit (2)
and urethane foam is used for the bonded body (2). Further, according to the configuration of the
present invention, each diaphragm unit (2) is connected to each other by a joined body, so that
each diaphragm unit is isolated as in the conventional speaker shown in FIG. There is no such
thing as having an immobile part in E between units (support f16). Therefore, the efficiency of
the speaker is not deteriorated, and the interference between the diaphragm units (ii) makes I!
The sound pressure frequency does not deteriorate in #. Therefore, it is possible to provide a flat
drive speaker for excellent bass reproduction. FIG. 5 shows another practical example of the
present invention. The parts corresponding to those in FIG. 3 will be described with the same
reference numerals as in FIG. 3. The feature of this embodiment is that each of the sliding plate
units Ql is irregular.
That is, in general, a spike wave driven by a voice coil propagates through the diaphragm (b) and
is reflected at the peripheral portion to produce a so-called resonance mode. In the present
invention, as described above, the use of a material having a large imaging loss with small
stiffness for the joined body (2) can suppress the resonance mode (particularly, the mode that
causes peaks and valleys in the sound pressure frequency response). ? By making the diaphragm
unit (good) itself irregular as in the second embodiment, it is possible to make the resonance
mode less likely to occur more effectively, and the high-frequency characteristic is flattened as a
speaker. can do. A requirement for irregular shape EndPage: 2 is desirably as asymmetric as
possible, but it is desirable that opposite sides of the lowest diaphragm unit C1) are not parallel.
FIG. 6 shows still another embodiment of the present invention. In the same manner, in the
second embodiment of the E * 3 shown in FIG. 2 and the corresponding parts of the
configuration are described with the same reference numerals, the diaphragm unit (b) itself is
rectangular #CII shaped in this embodiment. The driving position is set so that each side of the)
is not parallel to each side of the diaphragm unit 0, that is, according to such a configuration, the
picture excited by the voice coil unit When the transverse wave on the moving plate is reflected
by the peripheral joint portion (2), the force is weakened even if it is superimposed on the wave
driven by the voice coil (d) to change the angle. Therefore, the resonance mode generated on the
diaphragm can be suppressed and the sound pressure frequency characteristics can be flattened.
4. Brief description of the drawings Fig. 1 shows a conventional flat-drive speaker, Fig. 2 shows
its sound pressure frequency characteristics, and Fig. 3 shows one embodiment of the flat-drive
speaker of the present invention. FIG. 4 is a sound pressure frequency characteristic diagram
thereof, and FIGS. 5 and 6 are diagrams showing another embodiment of the present invention.
31 diaphragm unit 32 bonded body 34 frame 35-IX moving device 36 voice coil 37 · magnet 38
yoke 39 damper (6628) agent patent attorney Akira Tomioka (1 winter other) EndPage: 3
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