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JPS62194798

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPS62194798
[0001]
[Industrial field of application] The present invention is, for example, mounted on a diaphragm of
a speaker to detect an electrical signal according to the state of the diaphragm, so-called
motional field back frT (hereinafter referred to as MFB signal). This is a piezoelectric sensor
suitable for use. SUMMARY OF THE INVENTION The present invention is used, for example, for
detecting an electrical signal according to the vibration state of a diaphragm, that is, a so-called
MFI 3 fi, attached to a diaphragm of a speaker. A notch is provided in the substrate having the
above Young's modulus, and the piezoelectric element is fixed to the base so as to protrude into
the notch, and the impedance conversion circuit element is 2! By arranging them on a slope, it is
possible to reduce the size and weight and to obtain a good vibration detection signal. [Prior Art]
A piezoelectric sensor as shown in FIGS. 3 and 4 has conventionally been mounted on a
diaphragm of a speaker to detect an electrical signal according to the vibration state of vibration
vibration, a so-called "MI" 14 signal. A neo-like thing is proposed. First, the piezoelectric sensor
shown in FIG. 3 is a so-called double-end supported piezoelectric sensor, and a U-shaped notch
(la) is provided on the glass epoxy substrate + i +, and rubber is formed in the notch (la). Member
+ 21 (Fix both ends of the piezoelectric element (3) with 21 ”(Monthly 2) Support the 1 child (3)
and transform the impedance of this piezoelectric element (3) to lower impedance It is arranged
that a circuit (a 111S product such as 51 (51 etc. is disposed) is made to constitute a required
circuit). In the surface (6), a lead wire connecting the electrode of the piezoelectric element (3)
and the impedance conversion amount 1 洛 is 51 (a), and both ends are soldered respectively.
Also, in FIG. 4, the piezoelectric sensor is a so-called piece [.nu. Is also referred to as a beam
pressure 111 sensor, and copper 1 + 'f (81 is provided on the top surface of the glass table 9). Type element (101 is adhesively fixed by a conductive adhesive so that it partially protrudes, and
impedance conversion is 1/8 (11)) (is formed on another epoxy substrate (12) J knee,几 -type
element (lull and impedance conversion circuit vPt (11) are connected by lead wires (13) and
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(14). This piezoelectric sensor can detect the vibration detection 11 by the piezoelectric element
(In) (7) jQ. (Problems to be Solved by the Invention) However, in the piezoelectric sensor of the
example shown in FIG. 3, since the piezoelectric element (3) is supported at both ends, the size of
the piezoelectric sensor is increased. 1tl of a single port 1 (7) for connecting a lead wire (6) and a
piezoelectric element (3) and a lead wire (6), which are connected to each other The frequency of
the primary common frequency of this piezoelectric element (3) changes depending on the
magnitude of 'H, and for this reason there is a disadvantage that piezoelectric sensors having the
same characteristics have a characteristic of y1F.
In addition, the piezoelectric sensor shown in FIG. 4 requires a member for coupling the glass
pedestal (9) and the substrate (12). In this case, a small increase in the amount of spinning of this
speaker is caused, and the efficiency of the speaker, i.e., the conversion efficiency of the voice 4g
human power to the voice coil to the voice coil is disadvantageously reduced. The present
invention is to provide a pressure sensor that can reduce the size and weight as well as to obtain
a good vibration detection signal according to the vibration state of the diaphragm. Make a 1: 1
and 4 °. [Means for Solving the Problems] As shown in FIG. 1, the piezoelectric sensor according
to the present invention has a notch (16a) in the substrate (16) having a Young's modulus equal
to or higher than that of the piezoelectric element (15). To fix the jE type element (15) to the
base N (lf5) so as to protrude into the notch (16a) and to dispose the impedance conversion
circuit element section (17) on the substrate (16). It is something like that. [Notice J According to
the present invention, a notch (16a) is provided in a substrate (16) having a Young's modulus
equal to or less than that of the piezoelectric element (15), and the piezoelectric element (15) is
notched As it is fixed to the substrate (16) so as to protrude to (16a) and the impedance
conversion circuit element part (17) is disposed on the substrate (16), the size and weight
reduction of the piezoelectric sensor is achieved. be able to. Further, the piezoelectric element
(15) is fixed to the base 1 (16) having a Young's modulus equal to or greater than this
piezoelectric element (15) '(because it is) -1 vibration element (15) vibrates A good vibration can
be performed following the 1 辰 勅 of the plate, and a vibration (a good vibration detection signal
corresponding to the vibration can be obtained. EXAMPLE 1 One real Mi example of the
piezoelectric sensor of the present invention will be described with reference to FIGS. 1 and 2.
FIG. In this example, the case where this piezoelectric sensor is applied to an MFB speaker will be
described. In FIG. 1, (16) reduces the size of the ceramic substrate, and in this example, a copper
layer (18) is provided on the upper surface of the substrate (16) and a notch (16a) is formed in
the substrate (16). And the piezoelectric element (15) is disposed so as to protrude into the notch
(16a). As the piezoelectric element (15), a brass thin plate (19) is sandwiched between ceramic
plates (20) and (21), and silver thin films (22) and (23) are broken on the surface of the ceramic
plates (20) and (21). The so-called bimorph 4k is used, and this pressure 'Iii A child (15) is
brought into contact with the base & (16), and an example silver thin film (23) is brought into
contact with a conductive adhesive. The silver thin film (22) and 141 @ (1B) are fixed to the
substrate (16) and are not in contact with the base & (16) together with the silver thin 113 (23)
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1b 1 (1B) 1 Mj niir I And so on by soldering the both ends via the lead wires (24).
In this way, the base (16) on which the conversion element (15) is mounted is attached to the
speaker vibrator, and a predetermined distance between the book + 灸 (22) (23) and the brass
thin plate (19) When a direct current voltage is applied, the vibration of the speaker moves to the
first class, so that the portion where the piezoelectric element (15) protrudes from the substrate
(16) corresponds to the vibration of one peristaltic movement (1 spring Between the books IQ
(22) and (23) and the brass thin plate (19), an electricity (a cylinder can be obtained according to
the vibration state of the vibrator). However, since this IF element (15) is a capacitive element, its
impedance is high, and when it is made smaller, this impedance becomes even higher, and the
electric signal obtained as described above can be obtained as M F B In the case of feedback to
the amplifier, the signal becomes an MFB signal with a deteriorated S / N ratio due to the
influence of extraneous electrostatic noise. Therefore, in the present embodiment, 5lnt 1f-i of the
impedance conversion circuit element (I7) incorporating the impedance conversion circuit for
converting the impedance of the piezoelectric element (15) based on the terminal provided on
the I 而. (18) and -R are fixed on the substrate (16), and the electric signal obtained on the moon′ ′ Iii element (15) is supplied to the impedance conversion circuit element (17) to obtain 7)
Make it In this case, this impedance conversion circuit is configured, for example, as shown in
FIG. In this second case, (25) indicates a 'di source terminal to which a predetermined DC voltage
is supplied, and each' power terminal (25) can be connected to the resistors R1 and R? And a
common connection point between the resistor R1 and the resistor R2 is connected to the gate
electrode of the n-channel field effect transistor (27) via the resistor R3. To supply a
predetermined bias voltage to the gate electrode of each n-channel field effect transistor (z7).
Also, in this case, one of the terminals (28) and (29) to which the piezoelectric element (15) is
connected (Il'F for 210). The other terminal (29) is connected to the common terminal (26) while
the other terminal (29) is connected to the common terminal between the resistor R3 and the nchannel field effect transistor (27), and a predetermined DC voltage is applied to the piezoelectric
element (15). At the same time, an electric signal corresponding to the vibration of the
diaphragm obtained by the piezoelectric element (15) can be supplied to the gate electrode of the
n-channel field effect transistor (27). Further, the 'd1 source terminal (25) is connected to the
drain electrode 1 of the n-channel field effect transistor (27) through the critical point / AR 4 and
the source electrode of the n-channel field effect transistor (27) Is connected to the ground
terminal (26) through the resistor R5.
Further, the drain electrode of the n-channel field effect transistor (27) is connected to the base
electrode of the PNP transistor (30), the emitter electrode of the PNP transistor (3o) is connected
to the power supply terminal (25), and the collector electrode is It is connected to the source
electrode of the n-channel field effect transistor (27). When the electric circuit of the impedance
conversion circuit element (17) is configured in this way, the output impedance of the impedance
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conversion 11] element (17) can be lowered so as not to be affected by the external electrostatic
noise. And 11) the signal obtained by amplifying the electric signal obtained in the city element
(15) can be obtained at the emitter of the l) N I type transistor (30), so that the M F B (i − The j
number can be fed back to z: (amplified). Therefore, motional feedback (No. 4 can be fed back to
the amplification Z: (1) from the emitter of this 1) N P type transistor (30) through a condenser 9
'(not shown). In addition, in FIG. 1, “ζ (3)” (32) is obtained by an 11-salt sensor (15) while
supplying a predetermined DC voltage to the beam-type element (15) and the impedance
conversion circuit element (17). M FB times signal line 1 N11 supply a lead wire for sniffing, and
one side line (3) is connected to the other terminal of the impedance conversion circuit element
("7") by a half day The other end of the wire (32) is connected to the thin brass piece (19) of the
moonlight element (15). By mounting the piezoelectric sensor on the diaphragm of the speaker,
the moon sensor of the present example, which is constructed in this way, mounts the
piezoelectric sensor on the diaphragm of the speaker. This motional feedback (4 フ ィ ー ド feed
to the amplifier every time, it is possible to improve the frequency characteristics and nonlinear
distortion of the speaker. According to this embodiment, the base & (16) is provided with a notch
(16a), and the piezoelectric element (5) is projected into the notch so as to have a so-called
cantilever shape. In addition to being fixed to a radix (l ξ;), an impedance conversion circuit
element is also disposed to a radix (16) of each other (there is a benefit that the size and weight
of the piezoelectric sensor can be reduced). . Further, according to this embodiment, the
piezoelectric element (15) is integrally formed of a ceramic material and the number (16) of the
piezoelectric element (15) to be attached is also formed of a ceramic material. Since the Young's
modulus is equivalent to that of the piezoelectric element (15), the J-E'dlt element (15) follows
the vibration of the diaphragm of the speaker and performs good I & 2 It has the advantage of
being able to make good M F B (i '+ (-') depending on the plate's vibration condition.
("There is a benefit that the speaker using the 11- sensor of this example can be an M-FB speaker
with good reproduction characteristics." Face, the above real h'il! In the example, the case where
the piezoelectric sensor of the present invention is used as a speaker is described, but it is
needless to say that it may be used for various other settings instead. The present invention is, of
course, limited to the above-described embodiment, and various other configurations can be
taken without departing from the scope of the present invention. According to the present
invention, according to the present invention, a notch is provided in the radix, and the first power
element is fixed to the substrate so as to protrude from the notch, and the impedance conversion
circuit element is also arranged on the substrate. Jl: Because it is designed to be installed, there is
a benefit that it is possible to reduce the size and weight of the salt sensor. Further, since the
Young's modulus of the substrate is equal to or more than that of the piezoelectric element, and
the piezoelectric element can perform good vibration following the swing 1 of the vibrating plate,
the 1 oscillation of the vibrating plate There is a benefit that a good vibration detection signal
can be obtained according to.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of an embodiment of the piezoelectric sensor according to the
present invention, FIG. 2 is a block diagram of an example of the electric circuit of the impedance
conversion circuit element of FIG. 1, and FIG. FIG. 4 is a perspective view showing an example of
a sensor, and FIG. 4 is a perspective view showing another example of a conventional
piezoelectric sensor.
(15) is a piezoelectric element, (16) is a ceramic number base, (16a) is a notch, (17) is an
impedance-transformed ItIJ path element, (19) is a J: thin brass, (20) and (21) Are respectively
ceramic treatment, and (22) and (23) are bookkeeping respectively.
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