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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric buzzer and a conductive paint for forming an electrode thereof. [Prior Art] As shown
in FIG. 1, in a piezoelectric buzzer, an electrode 2 is formed on the surface of a piezoelectric
vibrator 1 and a lead wire 4 is connected to the electrode 2 directly or through a metal elastic
body 3. It is Silver paste is conventionally used as the electrode 2 in this piezoelectric buzzer, and
as shown in FIG. 8, the silver paste is applied to the surface of the piezoelectric vibrator 1 by
printing to form the electrode 2, and thereafter the electrode 2 is formed. Drying and baking are
performed according to the flow shown in the figure, and a piezoelectric buzzer is manufactured.
[Problems to be Solved by the Invention] The piezoelectric vibrator 1 of the piezoelectric buzzer
is desired to be as thin as possible from the viewpoint of vibration characteristics. However, if it
is made thinner, silver migration may occur in the electrode 2 when a DC voltage is applied in the
wet atmosphere after the baking (about 800 ° C.) in the conventional manufacturing method by
drying and baking etc. There is a problem that the thinning of the vibrator 1 can not be achieved.
As a method of achieving the above-mentioned thin film formation, there is known a method of
heat curing a coating of a conductive paste consisting of metallic silver powder and a
thermosetting resin, but in this case, the conductivity is lowered and it is formed on the
insulating substrate. There is a problem that the adhesion of the coating is poor. In addition, the
capacity (capacitance, resonance characteristics) of the piezoelectric vibrator according to this
method is lower than in the case of the method using the drying and baking, and thus there is a
problem that sufficient sound pressure can not be obtained. Therefore U of this invention! The
problem is to solve the problems of the above-mentioned conventional silver paste, ■ has good
conductivity, ■ is easy to screen printing, intaglio printing, ■ has good adhesion of the coating
on the insulating substrate Thin line circuit can be formed, Solderability and strength on soldered
film are excellent, Conductivity of conductive circuit of solder coat can be maintained over a long
period, Electrode capacity can be improved To provide a silver paste that can be [Means for
Solving the Problems] As means for solving the above problems, in the present invention, a total
of 100 M 1 j 1 of 85 to 96% by weight of metallic silver powder A, 15 to 4% by weight of resol
type phenolic resin B, and both A and B Part consists of 0.1 to 8 parts by weight of saturated
fatty acid or unsaturated fatty acid or metal salt thereof and carbon black required parts by
weight, and said resol type phenolic resin B is a 2-1 substituted compound which it has When the
infrared ray transmittance of the 2.4-2 substituted body, the 2.4.63 substituted body, the
methylol group, the dimethylene ether, and the phenyl group by infrared spectroscopy is l, m, H,
a, b, c (1) 1 / n = 0.8 to 1.2 (1) 1 / n = 0.8 to 1.2 (3) 1 / n = 0.8 to 1.2 2 ')--= 1.2-1.5 It had
adopted a piezoelectric buzzer electrode-forming coating material comprising a hold paste.
The weight part of carbon blank mixed in the silver paste and the particle size may be
determined appropriately by experiments etc. For example, 0.5 to 20! The amount is preferably 1
to 10 parts by weight, and the particle size is, for example, 15 (10 '') nm-l nm, preferably 15 n- to
50 n-. Further, the silver powder particles of the above-mentioned silver paste may be formed to
have an electrode size of 0.1 to 20%, preferably 1 to not more. Carbon black may be further
added as the silver powder particle size in this range. Then, an electrode made of the paste
having the above-described configuration is formed on the surface of the piezoelectric vibrator,
and a lead wire is connected to the electrode directly or through an elastic body to constitute a
piezoelectric buzzer. [Function] With the silver paste according to the present invention
configured as described above, the solderability deteriorates if the blending amount of metal
silver powder is less than 85% by weight, and conversely, if it exceeds 96% by weight, the metal
silver powder is sufficiently It is not bound, the resulting electrode is also brittle, the desired
soldering strength can not be obtained, the conductivity is lowered and the screen printability is
also deteriorated. Preferably, it is 88% by weight or more, more preferably 90 to 93% by weight
in the composition with the resin. With respect to the resol type phenol resin to be used, its
stoichiometry, the amount of 2-1 substitution is λ, the amount of 2.4-2 substitution is μ, the
amount of 2.4.6-3 substitution is ν, the amount of methylol group is α When the amount of
dimethylene ether ヲ β, and the amount of phenyl group is T, it means that -β of the above
constitution is smaller. That is, it means that ν is larger in the 2.4.6-3 substitution amount than
the 2-1 substitution amount λ and the 2.4-2 substitution amount μ. If the value is smaller, the
solderability of the electrode will be poor, and if the value is-, the conductivity of the electrode
will be poor. α Therefore, as a resol-type phenolic resin which makes the hardness of the
obtained electrode appropriate and combines good conductivity and solderability, it becomes α
α shown in the above-mentioned constitution. That is, it means that the amount of methylol
group α is larger than the amount of dimethylene ether β and the amount of phenyl group T. In
general, when the 2.4.6-3 substitution amount 大 き く is increased, the crosslink density of the
resol-type phenol resin is thick and the electroconductivity is improved. However, conversely, the
electrode tends to be hard and brittle, and the physical properties become worse (they become
worse). It is suitable for n n a □ to be 1.2 to 1.5. When the amount of the resol-type phenolic
resin is less than 4% by weight, the metal silver powder is not sufficiently bound, the obtained
electrode is also brittle, the conductivity is lowered and the screen printability is deteriorated.
On the other hand, when it exceeds 15% by weight, solderability is not preferable. With saturated
fatty acids or unsaturated fatty acids or metal salts thereof, in the case of saturated fatty acids,
C16-C20 palmitic acid, stearic acid, arachic acid and the like, in unsaturated fatty acids, such as
C16-18 carbon seamarins Acids, oleic acid, rylic acid and the like, and in the case of their metal
salts, salts with metals such as potassium, copper, aluminum, sodium, zinc and the like. The use
of these dispersants is preferable because it promotes the fine dispersion of the metal silver
powder in the resin in the combination of the metal silver powder and the resol-type phenol
resin, and forms an electrode having good conductivity. The blending amount of the saturated
fatty acid or the unsaturated fatty acid or the metal salt thereof is in the range of 0.1 to 8 parts
by weight, preferably 1 to 3 with respect to 100 parts by weight of the total amount of metal
silver powder and resol type phenolic resin It is a weight part. When the compounding amount of
the dispersant is less than 0.1 part by weight, fine dispersibility of the metal silver powder can
not be expected, and conversely, when it exceeds 8 parts by weight, the conductivity of the
electrode is lowered, and the electrode and piezoelectric vibration It is not preferable because it
leads to a decrease in adhesion with the child. In the silver paste according to the present
invention, an ordinary organic solvent can be appropriately used to adjust the degree of
transformation. 0 For example, butyl carpitol, butyl carpitol acetate, butyl cellosolve, methyl
isobutyl ketone, toluene, xylene, etc. Are known solvents. [Examples] With the compounding ratio
shown in Table 1, Example 1 has a silver powder particle size of 0.8 m, l, 04.1, 3μ, 3.0μ, 5.0ay.
Seven types of 15μ and 20u were respectively kneaded with a three-wheeled roll for 20 minutes
to prepare a silver paste. In Example 2, the silver powder diameter: 5. On, carbon black particle
size: 40 μm, 25 μm, 16 μm, weight ratio to silver powder: 1%, 2.5%, 4%, 5%, 5%, 6%, 7.5%, 9%
appropriately selected Then, the silver paste was prepared by kneading with a triaxial roll for 20
minutes each as well. As the resol type phenol resin, one having an infrared transmittance ratio
of-= 1.31 was used. Table (Weight ratio) As shown in FIG. 2, the silver paste of Example 1.2 thus
adjusted is applied to the pseudo substrate surface of the piezoelectric vibrator 1 by screen
printing to form the electrode 2 , Measured its own cabality. The results of Example 1 are shown
in FIG. 3, and the results of Example 2 are shown in FIG. From this result, it can be seen that as
the metal silver powder diameter decreases, the coverage increases, and as the carbon black
content (addition amount) increases, the capacity also increases.
In addition, when conductivity, adhesiveness, solderability, solderability, and printability were
examined, sufficient St property could not be obtained with silver powder diameter 2 0.5-or less,
and same l. In the case of-or less, the solderability worsened, but was satisfactory in other points.
As described above, when the particle size of the metallic silver powder is reduced, the capacity is
improved, but on the other hand, problems occur in the conductivity and the solderability. This is
considered to be because the smaller the particle diameter, the easier it is to enter the surface of
the pseudo substrate (plate voltage vibrator 1), and the bonding degree is improved. For this
reason, it is understood that it is preferable to apply a plurality of pastes and form the electrodes
2 in a plurality of layers so that the piezoelectric vibrator 1 side has small diameter grains and
the lead g4 side has large diameter grains. Moreover, metal silver powder diameter = 5. Ol!
m, carbon blank diameter: 37 nm, compounding ratio (weight ratio) of metallic silver (Ag) and
resol type phenolic resin (Re) 86: 14.88: 12.90: 10.92: 08.93: 07 A silver paste of .94: 06 was
formed, whereby the electrode 2 was formed in the same manner as described above, the filling
amount of the carbon black was changed, and the relationship between the filling amount and
the coverage is shown in FIG. FIG. 6 shows the coverage of silver silver powder (particle size: 5 p)
(the weight ratio to the resin, for example, 88 in the figure: silver powder: # I4 fat-88: 12). The
relationship with the filling amount is shown. In FIG. 7, metallic silver powder (diameter 51! m)
and the carbon black (diameter, 40 nm, 25 nm, 16 nm) showing the degree of change in specific
resistance due to the change in the proportion of silver paste electrode. In this case, metallic
silver powder: resin is 92: 8 (% by weight) Met. [Effects of the Invention] Since the present
invention is configured as described above, a capacity electrode close to that of a conventional
silver paste in a state where various performances such as conductivity, screen printability,
adhesion and solderability are well maintained. It can be done. As a result, the sound pressure is
not reduced and the productivity is improved because the baking is not required, and the baking
of the grit does not have the fear of the migley silane in the post-wetting atmosphere, so that the
thickness of the piezoelectric vibrator is reduced. It can be planned.
Brief description of the drawings
1 is a schematic view of an example of the piezoelectric buzzer according to the present
invention, FIG. 2 is a production explanatory view of thinning, FIG. 3 is a relation diagram of
metal silver powder diameter and capacity, and FIG. Fig. 5 shows the relationship between
carbon black content and capacity, Fig. 6 shows the relationship between metal silver powder
loading and capacity, Fig. 7 shows carbon black content and specific resistance FIG. 8 is a
production explanatory view of a conventional example.
1 · · · Piezoelectric vibrator, 2 · · · · · · · · · · · · · · · · · · · · · metal elastic body, 4 · · · · · · lead wire.
Patent Assignee Tack Electric Wire Co., Ltd. Same agent Atsushi Shibata Fig. 2 Silver powder
loading amount (Weight @%) Fig. 5 Ag / Re 6J1101214 carbon black addition ff 1 (weight%) Fig.
7 + o -113 nm-o -25 nm Fig. 4 Fig. 8
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