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FIELD OF THE INVENTION [Industrial-]-1 Field of the Invention The present invention relates to
an MF speaker, and more particularly to a sensor structure of an acceleration type MFB speaker.
In the prior art (see FIG. 7), the motion of the vibrating thread of spy and force is detected by a
vibration detector and proportional to the vibration. There are known M.sub.F.sub.B (motional
feedback) speakers that control the motion of a vibrating system by negative feedback to the
input. The response characteristic of the frequency 'Fi' of the amplitude type MF H using the
amplitude sensor which detects the amplitude is shown in FIG. 8 i). The characteristics change as
indicated by the arrows, compared to those without motional feedback. In addition, as a vibration
detector for the MFB speaker 1, 2 as a speed sensor using a speed sensor that detects the
amplitude, the speed type MFB's L-line number F n: 'V, 1 ?) 7 21 5 5 ? 52 Toso + / 1. ,, S I--1; -J
(, ':-> 1' E- ') not! The characteristics or arrows (1: show, 5 !,-da, change) compared to those
without lids. Furthermore, M F) (Scrying force vibration detector y?j ? ? r, acceleration
collapse form MFB ? ? ? frequency 7 ? using an acceleration sensor based on acceleration
detection) pressure 1. ?????? 'The eight characters are shown in Fig. 3 ((?)'. Mo-shi,-+ full
feedback (compared to the one without the arrow GJ "as indicated by the arrow GJ" 5 t: "8
change from 8 in Fig. 8) (2, 'small 1] diameter and small key to ~ и: Subi-force s Te net' low
frequency, 't2 1 favored acceleration type M l "B to play Te, are. Conventionally, the acceleration
type MFB and j, the sound L on the front of the diaphragm (-the microphone L-phone (-detected
from the 1-co-1-73 type, Fig. 9!:, ',:, Ig: ru) (1 :: voice, l-il front curve j: h: = f-element, ?-ci:
installed via in C), bi-chome, voice Z-element Y output signal: t-il front G, -A-10 F E T 1-7 A head
amplifier consisting of a resistor and a resistor A, A, A 1 ? ? taken out 1) What is the problem
to be solved 6) ?Invention or Solution 1? In the prior art, the acceleration of ?; J: ???; J: ?
? ?; J: ? ? ?; J: microphone 7 7) the diaphragm% (1, ?)? ?(t? Therefore, 1 и 10) ? ?
Shibeno 1 (high-pitched n: sop, I (1,1 ? need to bear dust, expensive (, 77) 61, which would be a
problem h)).
Ma / / и и (9 Figure 44. In the case where the 'J-Zo element is attached to the front of the' neovoice coil ', the effect of the' J-J-Z-J-J 'output beam и и и John acts (1 or higher frequency range),One minute acceleration IV [FB is a drawback, there is a drawback that it is difficult to install, and
also, the voice coil portion is attached to the FET or FET which constitutes an actuator or an
actuator J) Quality 1. lx J-li:% of the sensor is difficult to obtain a stable sensor detection output
'JP:' ', 1, this invention is to solve the problem of (1- Two stable ones, and an acceleration sensor
+ j detection output. ииииииииииииииииииииииии 8 The acceleration of the piezoelectric buildup-j '-("и и и и и и и ?? и
и и и) ring-like member 6- via 12r fixed 111, the acceleration sensor-1' 7) 5-7 No. 5 7 ? ?????
~ G: fixed ? / 6 и и и head amplifier (, '', the output of the head ?] и и и и и и ? ? 1 и и и и 1 C и и и ? ?
C и и и C1: configuration 181. 6) 5: The M F n sbi-the force, the acceleration squeezing the river
and the pressure, the ceramic element on the back surface of the speaker diaphragm 6. ', Via the
ring-shaped member 1, fixed 18, voice the C8 No. of the acceleration sensor. j-il, + r L-: C1 ? ?,
G attached to the attached conductive portion and the damper и via the conductive portion and
input to the head amplifier fixed to one frame. Furthermore, a plurality of the above-mentioned
MF13 sensors / forces r: ?Hey r, the above-mentioned accelerators 7] / s are dispersed 1. "C
mounting parallel connection! ???????????? [Operation-1 Piezoelectric element C5,
"-is the ring-shaped member f11 .: the vibration of the diaphragm is transmitted by ?-, but the
vibration Z'-, which transmits the vibration, is determined by the force of the element:? ? 1, 2 1
etc. of acceleration <, The contact surface of the ring-shaped member whose slope is narrow 1. ?
? t t ? t: ? ? ? ? ? ? ? i i2, piezoelectric effect (1 ,: more acceleration ?: (1, ? L) / / :: (1,
? ? ? ? ? ?). 2) Forced snowfall: 2 mass force 1 large, 7-7 M 4 single element f, 4 ?4? ?
? ?)))), 2 ? ?It is cheap. Mp и и и acceleration semi и C7, 7t 7t? ??????????????
ll :: n C, a conductive part attached to this-one damper = -c, "': a head attached 2 through a
conductive part 1, a head ascite c,': an input track, and an antenna The vibration of the second
conductive portion is stable 127, and noise due to unstable mechanical vibration, that is,
microphone 17 bounce noise is prevented. Furthermore, if the head amplifier is mounted on the
speed and force frame, the effects of 2 resonances and vibrations will be leaked, and the
acceleration-(и: multiple sensors will be distributed and removed (-i-G l parallel connection) If the
divided vibration of the diaphragm is 4.1 m, J, the influence or decrease11, the output impedance
becomes smaller and the S / N ratio is improved. In the embodiment of the present invention, the
line side of the invention will be described with reference to the drawings. FIG. 1 shows an
embodiment of the present invention, and is a back surface, FIG. 2 is a sectional view taken along
the line A-A in FIG. 2, FIG. 3 is a sectional view taken along the line B-B in FIG. The drawing is a
schematic perspective view showing the voice coil-bobbin portion in the embodiment, and FIG. 5
is a schematic front view showing the sensor lead wire in the embodiment. As shown in FIG. 2,
the diaphragm 3 is attached to the frame 8 fixed to the magnetic circuit 11 via the edge 10. The
voice coil bobbin 6 is supported by a damper 5 with a conductive portion attached to the frame
8, and its tip is fixed to the diaphragm 3, and is flowed to the voice coil 6 a wound in the
magnetic field of the magnetic circuit 11. The vibration due to the current is transmitted to the
diaphragm 3. As shown in FIGS. 1 and 3, the ring-shaped members 2 and 2 are adhered to the
back surface of the diaphragm 3 and the ring-shaped member 2.2 is further bonded with an
adhesive to a piezoelectric ceramic element 1 of diameter 128. Is glued. The output terminals of
the piezoelectric ceramic element 1, 1 are connected in parallel to the sensor lead wires 12, 1.2,
and the sensor lead wire 1.2. 12 extends from the piezoelectric ceramic element 1 as shown in
FIG. The copper foils 6b and 6b are fixed to the back surface of the plate 3 and pass through the
holes provided in the diaphragm 3 to the front of the diaphragm 3 and are bonded to the voice
coil bobbin 6. After being connected to the sensor lead wires 12.12 or the copper foils 6b and 6b,
the sensor lead wires 12.12 shown on the front surface of the diaphragm 3 are fixed to the dust I
to gap 9 or the diaphragm 3 so as to cover the sensor lead wires 12.12. By doing this, the
piezoelectric ceramic element 1, 1 or the sensor lead wire can not be seen from the surface. The
copper foils 6b and 6b are further connected to the tinsel wires 5a and 5a attached to the
conductive part-attached damper 5, and the tinsel wires 5a and 5a are connected to the input
terminals of the head amplifier 7 fixed to the frame 8.
In the damper 5 with conductive part, two sets of tinsel wires for connecting the speaker
terminals 4 to the voice coil 6a are attached as shown in FIG. 1 and there is a pair of tinsel wires
not used as a wire of the voice coil. It is used as a conductor for transmitting the sensor output.
The output terminal of the head amplifier 7 is further connected to the sensor output terminal 13
fixed to the speaker cabinet, and the acceleration signal of the vibration detected by the
piezoelectric ceramic element 1.1 is amplified by the head amplifier 7 and is output from the
sensor output terminal 13 Negative feedback to the input of the speaker drive amplifier. The
frequency response characteristic of the speaker (aperture 16 cm, internal volume 11 liter) of
this embodiment is shown by a solid line in FIG. In the figure, the frequency response
characteristics in the case where MFB is not applied with the same line and dotted line in the
dotted line are shown, and-in dotted line the high frequency band is removed from the signal of
the piezoelectric ceramic element of the same speaker to make a speed type MFB speaker The
frequency response characteristic is shown. As is apparent from the figure, the acceleration type
MFB speaker of the embodiment has the low frequency gain enhanced. According to the MFB
speaker of the present invention, a ring-shaped member is interposed between the sensor and
the diaphragm to obtain a good acceleration signal. In addition, small and light sensors can be
used, and motion feedback can be performed to high frequencies. In addition, microphonic noise
reduction of the sensor lead is prevented because there is no wiring in the air. In addition, since
the head amplifier is fixed to the speaker frame, the influence of the head amplifier on the
resonance and vibration characteristics can be eliminated.
Brief description of the drawings
1 is a front view showing an embodiment of the present invention, FIG. 2 is an A-Ailj plan view in
FIG. 1, FIG. 3 is a B-B sectional view in FIG. 2, and FIG. 4 is the same embodiment. FIG. 5 is a
schematic perspective view showing a voice coil and a bobbin portion, FIG. 5 is a schematic front
view showing a sensor lead in the embodiment, and FIG. 6 is a comparison of the response
characteristics of the MFB speaker of the embodiment with the response characteristics of other
speakers. Figure 7 is a block diagram showing a general MFB speaker, Figure 8 (a) is a graph
showing the response characteristics of an amplitude type MFB speaker, and Figure 8 (1) is a
response of a speed type MFB speaker FIG. 8 (c) is a graph showing the characteristic, FIG. 8 (c)
is a graph showing the response characteristic of the acceleration type MFB speaker, and FIG. 9
is a cross-sectional view showing an example of a conventional acceleration type MF speaker.
DESCRIPTION OF SYMBOLS 1 ... Piezoelectric ceramic element, 2 ... Ring-shaped member, 3 ...
Diaphragm, 4 ... Speaker terminal, 5 ... Damper with a conductive part, 6 ... Voice coil, bobbin, 7 ...
и и и и и и и Head amplifier, 8 ... frame, 9 ... dust cap, 10 ... edge, 11 ... magnetic circuit, 12 ... sensor
lead wire, 13 ... sensor output terminal.
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