JPS62211695

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DESCRIPTION JPS62211695
[0001]
The present invention relates to a sensor for an electronic musical instrument such as an
electronic guitar such as an electronic guitar, an electronic base, an electronic piano, etc. which
electrically extracts vibration of a metal string, and in particular, a piezoelectric element such as a
piezoelectric crystal. The present invention relates to a sensor for a piezoelectric electronic
musical instrument used. (Prior art) As such a sensor for a piezoelectric type electronic musical
instrument, there is one as shown in FIG. 8, and FIG. 9 is a sectional view taken along the line B-B of FIG. The sensor S shown in FIGS. 8 and 9 includes a body member 2 formed of brass, iron or
the like provided with a V groove 1 having an approximately 90 ° opening angle, and inclined
surfaces LA, IB of the V groove 1. And a first piezoelectric element 3 such as a pair of
piezoelectric crystals coated and fixed with a conductive adhesive made of epoxy resin, for
example, and the above-mentioned conductive element on the upper surface of the piezoelectric
element 3.3. Conductive adhesive 4 coated with a conductive adhesive and having a V-shaped
cross section, for example, made of a copper plate, and the V-shaped cross section, and the
above-mentioned conductive adhesive is applied to the outer inclined surfaces 5A and 5B And a
saddle member 5 made of, for example, iron or the like to which a second piezoelectric element
6.6, such as a piezoelectric crystal, is fixed, and the lead wire 7 is formed in a V-shaped groove of
the conductive plate 4 Soldered to the tip of the As shown in FIG. 10, the sensors S configured in
this way are provided on a plurality of mounting seats 9 provided corresponding to the
respective strings 10 formed on the base 8 fixed to the electronic musical instrument main body,
as shown in FIG. Each mounting seat 9 is provided with mounting screws (not shown) which are
inserted from tap holes IC formed in the body member 2 respectively. The string 10 of the
musical instrument is stretched in contact with the inner inclined surfaces 5a and 5b of the
groove portion of the saddle member 5, and the vibration frequency of the string 10 is converted
to an electrical signal by the piezoelectric element 3.6. It is configured to be taken out through
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the line 7. (Problems to be Solved by the Invention) In the sensor S, when assembled, the first and
second piezoelectric elements 3 and 6 and the body member 2 opposed to the piezoelectric
elements 3.6, the conductivity The conductive adhesive is applied to each contact surface of the
member 4 and adhered in a state where an appropriate pressure is applied between the
adhesions, but in addition to the inclination between the adhesions, Since the adhesive is not
quick-drying, there is a disadvantage that the position on each inclined surface of each
piezoelectric element 3.6 etc. is smaller than the desired bonding position. Therefore, there are
problems such as defective products and variations in product accuracy. (Means for Solving the
Problems) In view of the above problems, the present invention provides a body member having
a V-groove having an open angle of approximately 90 ′ ′, and a pair of first members fixed to
each inclined surface of the V-groove. A piezoelectric element, a conductive plate material having
a V-shaped cross section fixed in the V-shaped groove via the first piezoelectric element, and the
first piezoelectric element are respectively opposed to each other and fixed to the other surface
of the conductive plate A pair of second piezoelectric elements, and a saddle member having a
substantially V-shaped cross section fixed in the V groove via the second piezoelectric element,
and disposed in the V-shaped opening groove of the saddle member A sensor for a piezoelectric
type electronic musical instrument that electrically takes out the vibration of a string through a
lead wire connected to the conductive plate material, wherein the body member and the saddle
member are opposed to the first and second piezoelectric elements. Means for positioning each
piezoelectric element on at least one of each inclined surface or the conductive plate It lies in the
fact provided.
(Operation) At the time of assembly, by providing means for positioning the piezoelectric
elements on at least one of the inclined surfaces of the body member facing the first and second
piezoelectric elements, or at least one of the conductive plate members. The positioning means is
used to position each piezoelectric element at a desired bonding position on each inclined
surface. EXAMPLES Examples of the present invention will be described in detail below. FIG. 1 is
an external perspective view of a sensor for a piezoelectric electronic musical instrument
according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of
FIG. In FIG. 1 and FIG. 2, the sensor S has a body member 12 formed of brass, iron or the like
provided with a V-groove 11 having an open angle of about 90 °, and the V-groove 11 of the
body member 12 The first piezoelectric elements 13.13 such as a pair of piezo crystals fixed at
predetermined positions on the surfaces 11A and 11B with a conductive adhesive made of epoxy
resin, for example, and the V groove 11 of the body member 12 A V-shaped conductive plate 14
made of, for example, a copper plate and coated on the first piezoelectric element 13.13 with the
conductive adhesive applied on the surface facing the piezoelectric element 13.13; A pair of
piezoelectric elements 16.18, such as a pair of piezo crystals, coated and fixed with the
conductive adhesive at the other surface of the elastic plate 14 and at a position opposed to the
first piezoelectric element 13.13; Similarly, the cross section is V-shaped, and its outer inclined
surface 1 Includes A, the second piezoelectric element to such a pair of similarly piezo crystal by
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applying the conductive adhesive 15B, to fix the ie, a saddle member 15 which is formed of, for
example, iron or the like. Then, the inclined surfaces 11A and 11B of the body member 12 to
which the first piezoelectric element 13.13 is fixed, and the outer inclined surface 15A of the
saddle member 15 bonded to the second piezoelectric element 16.16. , 15B receive portions of
the piezoelectric elements 13, 13.1B, IE3 at positions where the first piezoelectric element 13.13
and the second piezoelectric element 16.18 are to be disposed, respectively, Recesses 21 and 22
serving as positioning means are provided for preventing 13,13.16.16 from sliding on the
respective inclined surfaces 11A, IIB, 15A and 15B in the inclined direction. The sensor S
configured in this way first applies the conductive adhesive to the bonding surface of the
recessed groove 21 and the first piezoelectric element 13.13 received in the recessed groove 21
in assembling. The conductive adhesive is applied to the bonding surfaces of the body member
12 with the first piezoelectric element 13.13 fixed and the recess 22 and the second piezoelectric
element 18.18 received in the recess 22. The second piezoelectric element is, which is fixed, and
the saddle member 15 with te are individually formed.
Next, a V-shaped conductive plate 14 to which the lead wire 7 is soldered is prepared, and the
conductive adhesive is applied to the bonding surface of the conductive plate 14 and the first
piezoelectric element 13.13, The conductive plate 14 is placed on the first piezoelectric element
13.13, and the conductive adhesive is applied to the bonding surface of the second piezoelectric
elements to, to and the conductive plate 14, respectively. After that, the sensor S of the present
invention is formed by placing the saddle member 15 with the second piezoelectric element
16.18 on the conductive plate 14. Further, when forming the body member 12 constituting one
member of the sensor S, as shown in FIG. 3, first, the V groove portion 1 in which the inclined
surfaces 11A and 11B and the recessed groove g21 are formed, and lead wire extraction A rodlike material 112 having a portion to be the recess 23 is drawn out. Then, after cutting for each
body member shown by a dot-and-dash line in the figure, a tap hole 11C is further formed. Each
body member 12 produced by cutting in this manner is subjected to surface processing as
required. Further, in forming the saddle member 15 constituting one member of the sensor S, as
shown in FIG. 4, first, portions to be the inner inclined surface 15 al 15 b + and the outer inclined
surfaces 15A, 15B and the concave portion 22. The element 115 having the above is drawn out.
Subsequently, it cuts at equal intervals for each saddle member 15 shown with a dashed dotted
line in the figure. In the same manner as the body member 12, the saddle member 15 is also
subjected to surface processing as required after cutting. The sensor S produced as described
above has the lead wire 7 fixed to the bottom of the V-shaped end of the conductive plate 14 by
soldering, and as in the prior art, as shown in FIG. Mounting seats corresponding to each of the
strings 10 via mounting screws (not shown) which are respectively inserted from the tap holes
11C formed in the body member 12 into a plurality of mounting seats 9 provided on the base 8
to be disposed In the sensor S provided on the mounting seat 9 in this manner, the strings 10 of
the electronic musical instrument are in contact with the inclined surfaces 1isa and t5b of the
groove 15C of the saddle member 15, respectively. The vibration frequency of the string 10 is
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converted into an electrical signal and can be taken out through the lead wire 7. In the above
embodiment, although an example of drawing processing is shown as processing means before
forming the body member 12, other than this, sizing processing, sintering processing, forging
processing, lost wax processing or the like is used. It is good. Also in the case of means for
manufacturing the saddle member 15, an example of drawing processing has been shown as in
the case of the body member 12. However, sizing processing, sintering processing, forging
processing, lost wax processing, etc. may be used other than this. It is good.
Furthermore, in the above embodiment, the first and second piezoelectric elements 13.13. As
positioning means for preventing te and te from sliding on the respective inclined surfaces 11A
and IIB of the body member 12 and the respective inclined surfaces 15A and 15B of the saddle
member 15 in the inclined direction, the piezoelectric elements 13 and 13. Recesses 21 and 22
for receiving a part of 18.18 are provided on each of the inclined surfaces 11A, IIB, 15A and 15B
of the body member 12 and the saddle member 16 respectively, for example, as shown in FIG.
Positioning concave portions 114C may be provided on parts of the inclined surfaces 114A and
114B of the plate member 114 respectively. In the assembly in this embodiment, first, the
conductive adhesive is applied in the recess 114C, and then the first piezoelectric element 13.13
and the second piezoelectric elements is and te are adhesively fixed. Then, the conductive
adhesive is applied and fixed in the V groove 11 of the body member 12 and then the saddle
member 15 is made of the same material (the conductive adhesive (the conductive adhesive
described above). Is applied and mounted and fixed. Further, in connection with the lead wire 7,
not only soldering at the end of the V-shaped groove of the conductive plate 14 but also, for
example, as shown in FIG. 6 and FIG. A protruding terminal 114D is provided in advance at the
end of the V-shaped groove, and the end of the lead wire 7 is tangled with the terminal 114D,
and then soldered to enable simple and reliable attachment. (Effects of the Invention) Therefore,
according to the present invention, each member can be assembled to a desired position with
certainty by using positioning means extremely easily at the time of assembly, so that assembly is
easy and costs are reduced. Not only can reduce the variation in product accuracy (and the
product performance will be stable).
[0002]
Brief description of the drawings
[0003]
1 is an external perspective view of a piezoelectric electronic musical instrument sensor
according to the present invention, FIG. 2 is a sectional view taken along the line A-A of FIG. 1,
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and FIG. 3 is a body member shown in FIGS. 4 is a perspective view showing the rod-like material
before forming the saddle member shown in FIG. 1 and FIG. 2, FIG. 5 shows a modification of the
present invention. 6 and 7 show a modification of the conductive plate shown in FIGS. 1 and 2.
FIG. 6 is a plan view thereof, FIG. 7 is a front view thereof, and FIG. The figure is an external
perspective view of a conventional piezoelectric electronic musical instrument sensor, FIG. 9 is a
sectional view taken along the line B-B of FIG. 8, and FIG. 10 is for explaining the state of
attaching the sensor to a base fixed to the electronic musical instrument main body. It is a typical
perspective view of.
S- sensor 7 lead wire 1011 chord 11 V groove 11A, 11B, 15A, 15B. 114A, 114B: inclined surface,
12: body member, 1341: first piezoelectric element, 14.114: conductive plate member, 1511:
saddle member, 16: second piezoelectric element , 21.22, 114C: Recess for forming positioning
means, No. 114D, No., terminal, 112: Material for rod-like body member, 115: Material for rodlike saddle member. Patent applicant Nanacom Inc. 114D Figure 9
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