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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views showing
each side of a conventional motional feedback speaker, FIG. 3 is the same cross-sectional view
showing one example of a conventional cone-type speaker, FIG. FIG. 4 is a sectional view showing
an embodiment of the motional feedback speaker of the present invention. 2 · · Diaphragm, 5 · · ·
Magnetic circuit, I · · · Center cap, 10 · · · · · · · · · · · · · 11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 13 Piezoelectric element 13b: metal mesh.
[Detailed description of the invention] This invention relates to a mossy false feedback speaker: 1
or 2 swords Y1). I. Conventionally, morphal feedback speakers (generally referred to as KM, F, B
speakers). ) K is, for example, as shown in FIG. That is, the same voice coil 6 as the drive voice
coil 6 is subjected to #A ± ± Feedback from the pickup coil 20 to improve distortion and reduce
internal resistance. 0 However, this conventional product is for driving The weight of the
diaphragm 2 is increased because the voice coil 6 and the pickup coil 20 are wound around the
voice coil bobbin 4 all the time, and the efficiency of the speaker is deteriorated, and the coil of
the pickup coil 20 and the voice coil 6 is wound. In this case, the width of the ri magnetic gap 5m
is required to be wide 9 and the length of the voice coil bump 74 becomes long. It is made to try
to solve the above-mentioned conventional product's shortcoming! )! As shown in FIG. 2 as
another type, the voice coil bobbin 4 is wound only on the voice coil bobbin 4 to prevent the
voice coil bobbin 4 from being elongated, and the Hall element 21 is fixed to the center cap 1. By
doing this, there was a thing that performs moral feedback by the Hall voltage generated as the
diaphragm 1 moves. 0 Furthermore, the compliance of the diaphragm is increased to improve the
reproduction. What is shown in That is, the air flow holes 12 are formed by drilling holes in the
pole 11 located on the back of the center cap T which is hermetically sealed, thereby improving
the flow of air on the back of the center cap T and making the compliance of the diaphragm 1
large. I'm sorry. Moreover, in order to prevent foreign matter from entering the air circulation
hole 12), a dustproof net 22 such as a metal mesh is attached to the air circulation hole 12 and it
is fragrant. In view of the above-mentioned points, the purpose of the invention is to provide a
dustproof net substitute sensor fixed to at least one upper and lower ends of an air flow hole
formed in a pole of a speaker's magnetic port 1I11'gtflI. It is an object of the present invention to
detect a signal from a diaphragm and to provide a mos- sional feedback speaker that can perform
morale feed pack with this detection signal. In the following, the first embodiment shown in FIG.
4 will be described. 1 frame, 2 motion m & 2 & u "y di, 3 damper, 4 voice coil bobbin, 5 magnetic
circuit, 5 turtle magnetic gap, 6 voice coil at the periphery of voice coil bobbin 4 / @ voice coil,
Reference numeral 1 denotes a center cap fixed to the opening 2btN of the front surface of the
diaphragm 2 at rounding.
The magnetic circuit 5 has a plate AM-II and a magnet 1 o 4! It shows an outer a-type composed
of J and a pole 11. An air flow hole 12 is bored in the ball 11. The air flow hole 12 communicates
with the back of the center caragu, for example. Reference numeral 13 denotes a sensor attached
to at least one upper and lower ends of the air flow hole 12. This sensor 13 is, for example,
affixing the EE electric element 13t) to a metal mesh 131L or a large number of small holes in a
film having a piezoelectric element. Permeating through K, it has air permeability and has a
structure that can be substituted for a dustproof net ◎ An embodiment of the present invention
is configured as described above, is voice coil @ KAI, and the magnetic flux in the magnetic
circuit 5 In the diaphragm 2tf diagram [in the vertical direction, 1 vibration occurs, and the voice
coil 6t-1 vibrates in the magnetic gap 5 &. Therefore, the back VC of the center camp 7 generates
air pressure because it vibrates together with the opening 2t of the diaphragm 2 and the center
cap T 2 diaphragm 2 which is closed. However, since the air flow hole 12 is bored in the ball 11
which forms the air flow circuit 5, the air on the back of the center cap T flows through this full
air flow hole 12, and vibration [Sty 7 Ness improves. On the other hand, the sensor 13 formed by
attaching the piezoelectric element 13b to the metal mask 13 is attached to at least one of the
upper and lower ends of the air flow hole 12 so that the sensor 13 has the center cap as
described above. 1 vibrates by receiving air pressure on the back surface of the center cap 1.
Therefore, the signal is detected by the re-sensor 13 and this detection signal =)! : Calendar! Since
moral feedback can be performed at the same time, it is possible to achieve the improvement of
distortion and the reduction of internal resistance. Further, the sensor 13 is formed by attaching
a piezoelectric element 13b to a metal mesh 7 or 131 9 and forming a large number of small
holes in a film including the piezoelectric element, thereby preventing intrusion of an object such
as dust etc. Have a dustproof effect. Also, although not shown in the drawing K, as another
embodiment, a metal mesh 7 as an electrode is fixed to the back surface of the center cap T, and
an air flow is formed on the other surface by interposing with the metal mesh. By forming a
capacitor filled with metal mesh 7 as an iE pole in one pain of the hole 12, vibration occurs as #i
movement of the fixed metal mesh and the diaphragm provided at the upper end of the air
circulation hole 12 Center cap 1 to! It is also conceivable to carry out a charge-free pack by
charge storage with the mounted movable metal mesh and converting the change in capacitance
As described above, the vibration from the diaphragm is detected by the sensor of the dustproof
net substitute fixed to at least one end of the upper and lower air flow holes formed in the ball
that constitutes the anaerobic channel of the leather-made speaker. You can perform moral
feedback at. The same parts in the drawings are denoted by the same reference numerals.
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description, jps55152786
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