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1-Specification 1, title of the invention
3. Detailed Description 1 of the Invention The present invention provides a speaker having a
large conversion efficiency and a flat acoustic power characteristic. First, as a conventional
example, a speaker (Japanese Patent Application Laid-Open No. 50-124621) using an accordion
curtain-shaped vibrating film will be described. 11. In FIG. 1, 1, 1 ', 2, 2' are magnets, 3.3 ', 4, 4'
are pole pieces fixed on one side of the magnets 1, 1 ', 2, 2' Magnetic gaps are formed between
the pieces 3, 3 'and between 4.4'. An vibrating membrane double band 6 in the form of an
accordion curtain is formed, and a signal current flows in the conductive band 6. Since the
conductive band 6 is disposed to be orthogonal to the magnetic field, the folds of the vibrating
membrane 5 are opened and closed as shown in FIGS. 3A and 3H depending on the direction of
the signal current to generate an acoustic wave. However, in the above-mentioned conventional
loudspeaker, pole pieces 3, 3 'and 4.4' are obstacles to the sound wave emitted from vibrating
membrane 5, and there is a drawback that disturbance is generated in the frequency
characteristic at a reduced level. . The present invention eliminates the above-mentioned
conventional drawbacks, and the basic configuration of the present invention will first be
described with reference to FIG. In FIG. 4, reference numeral 7 denotes a vibrating membrane
formed in a seven-letter shape, and a conductor 8 is provided on the outer peripheral surface of
the vibrating membrane 7 in the horizontal direction. A magnetic flux 9 is generated in the
magnetic gap of the magnetic circuit. The direction of the magnetic flux is perpendicular, and the
conductor 8 and the magnetic flux 9 are orthogonal to each other. Therefore, for example, when
current flows through the conductor 8 in the direction of arrow a, the V-shaped vibrating films 7
are displaced in the directions of arrows b and b ′ force directions, and EndPage: 1 between V-
shaped vibrating films 7 The pressure in the air gap will increase trn and sound waves will be
emitted. FIG. 5 shows the diaphragm 10 of the speaker in one embodiment of the present
invention, and the conductor 11 is provided in the substantially horizontal direction on the outer
peripheral surface of the star-shaped diaphragm 10. As shown in FIG. A magnetic flux 12 is
generated in the vertical direction, and when a current in the direction of the arrow a is supplied
to the conductor 11, each v-shaped portion of the vibrating membrane 10 is displaced so as to
close as in FIG. As a result, the pressure in the star-shaped vibrating membrane 1 is increased. On
the other hand, when the current flows in reverse, the pressure in the star-shaped vibrating
membrane 1o is negative. The speaker is configured as described above. 6 and 7 show another
embodiment of the present invention. In FIGS. 6 and 7, 13 is a disk-shaped yoke, 14 is an annular
magnet fixed to the upper surface of the yoke 13, and 15 is an annular yoke fixed to the upper
surface of the magnet 14. It is annularly disposed on an annular magnet 13 at the opposing
portion of the yoke 15 and the yoke 13.
Reference numeral 17 denotes a plurality of pins implanted in the yoke 13. The pins 16 are
annularly arranged around the outer periphery of the pins 16. A vibrating film 18 is formed in a
star-like shape by being tensioned alternately on the pins 16 and 17. A conductor 19 is formed
horizontally on the vibrating film 20. 2o is attached to the upper surface of the yoke 16 It is a
horn that has been In FIGS. 6 and 7, when an audio signal is applied to the conductor 19, the
diaphragm 18 vibrates, and a sound wave is emitted from the central portion of the diaphragm
18 through the horn 2o. In FIG. 7, if the room in which the air flow 21 is generated is made not
to resonate at the upper limit of the use band, the conventional equalizer is not necessary. For
example, as a diaphragm equivalent to a diaphragm of 100φ, if the diaphragm 18 has a height 2
exposed and a width of 50 mm and 10 bent portions of one piece of the diaphragm 18, up to 4
KHz without providing an equalizer Flat characteristics are obtained, and the vibration system
mass is 1.8 y, which is 45% of the vibration system mass of the conventional speaker, and the
flatness of the power characteristics is twice that of the conventional example. It extends at
frequency 1. FIG. 8 shows still another embodiment of the present invention. In FIG. 8, the same
parts as in FIG. 7 are assigned the same reference numerals. In FIG. 8, reference numeral 18 'is a
star-shaped vibrating membrane, and one piece of the vibrating membrane 18' is shaped like a
rhombus. 19 'is a conductor horizontally provided on the vibrating film 18', 21 is a conical
equalizer provided at the center of the yoke 13, and 22. 23 is a circle provided at the outer
periphery of the equalizer 21. It is an annular equalizer plate, and by providing the abovementioned equalizer 21 and equalizer plate 22.23, the phase on the throat surface of the horn 20
matches. The speaker according to the present invention has the above-described structure, and
according to the present invention, the following effects can be obtained. (A) Since the diaphragm
is star-shaped, the sound pressure is flat in the magnetic circuit and the like. (C) The vibration
system mass is reduced, the conversion efficiency is improved, and the high frequency limit
frequency is extended. (D) Power characteristics are common.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a conventional speaker, FIG.
2 is a perspective view of a diaphragm of the same speaker, and FIGS. 3A and 3B are operation
explanatory diagrams of the diaphragm of the same speaker, The figure shows the operation type
of the speaker according to the present invention, FIG. 5 is a perspective view of the diaphragm
in one embodiment of the speaker according to the present invention, FIG. 6 is a cutaway
perspective view of the speaker using the diaphragm, FIG. Is a sectional view of the same, and
FIG. 8 is a sectional view of another embodiment of the present invention. 1 o · vibrating
membrane, 11 · · · conductor, 13 · · · · · · · 14-magnet, 16 · · · yoke, 16 ° 17 · · · pin, 18, 18 '·
vibrating membrane, 19.19 '---Conductor. Name of agent Attorney Nakao et al. 1 person
EndPage: 2 Fig.1 Fig.2 Fig.4 Fig.4 Fig.5 Fig.6 EndPage: 3 Fig.7 Fig.8 EndPage: 4
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