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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric buzzer and a paint for forming an electrode thereof. [Prior Art] As shown in FIG. 1,
in a piezoelectric buzzer, electrodes 2 are formed on both sides of a piezoelectric vibrator 1 and
lead wires 4 are connected to the electrodes 2 directly or through a metal elastic body 3. It is.
Silver paste is conventionally used for the electrodes 2 in this piezoelectric buzzer, and as shown
in FIG. 3, the silver paste is applied to both surfaces of the piezoelectric vibrator 1 by printing to
form the electrodes 2, and thereafter, Drying and baking are performed according to the flow
shown in FIG. [The invention is going to solve tlII! ! 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 if a
direct current voltage is applied in a wet atmosphere after the baking (about 800 ° C.) in the
conventional manufacturing method by drying and baking etc. There is a problem that the film
formation 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 were problems such as poor adhesion
of the coating. Therefore, the object of the present invention is to solve the problems of the
above-mentioned conventional silver paste, (1) having good conductivity, (2) screen printing,
intaglio printing, being a good item, (2) coating on insulating substrate Good adhesion, ■ can
form fine line circuits, ■ has excellent solderability and strength with solder on films, and ■
proposes silver pastes that can maintain the conductivity of conductive circuits of solder coats
over a long period of time It is in. [Means for Solving the Problems] In order to solve the above
problems, in the present invention, 85 to 96% by weight of metallic silver powder A, 815 to 4%
by weight of resol-type phenolic resin, and both of A and B 2.4 parts by weight of saturated fatty
acid or unsaturated fatty acid or metal salt thereof with respect to 100 parts by weight in total,
and said resol type phenolic resin B is a 2-substituted compound which it has, 2.4 Infrared
transmittance by infrared spectroscopy of 2-substituted, 2.4.6-3 substituted, methylol group,
dimethylene ether, and phenyl group! , M, n, a, b, c, between each transmittance (i)-! ! -= O, e to
1.2 (b)-= 0.8 to 1.2 (c)-0 to 8 to 1 to 2 (d)-1 to 2 to 1.5 paste The coating material for forming a
piezoelectric buzzer electrode is used.
The metal silver powder A has an average particle size of 0.1 to 20 μ, preferably 1 p or less.
Then, on both surfaces of the piezoelectric vibrator, electrodes made of the paste having the
above-described configuration are formed, and a piezoelectric buzzer formed by connecting a
lead wire directly or via an elastic body to this electrode is configured. [Operation] The silver
base according to the present invention as described above has poor solderability when the
blending amount of metallic silver powder is less than 85% by weight, and conversely, metallic
silver powder is sufficient when it exceeds 96% by weight. In addition, the resulting electrode
becomes too strong, the desired soldering strength can not be obtained, the conductivity
decreases and the screen printability also deteriorates. 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 product is λ, the
amount of 2.4-2 substitution product is μ, the conversion amount of 2.4.6-31f is ν, methylol tSt
is α, Assuming that the amount of methylene ether ヲ β and the amount of phenyl group are T,
that "L one of the above constitution is large" means that the soil has a small n n ν. 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. Also, if "a" is large in the above-mentioned configuration, it
becomes α α α in that 8 r is small. 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. Generally, the
crosslink density of the resol-type phenolic resin increases as the 2.4.6-3 W conversion amount
大 き く increases, so 方 ν !! That is, the conductivity n n of the electrode is better as the squares
□ and □ are larger. However, conversely, the electrode tends to be hard and brittle, and the
physical properties deteriorate. Also, if l is small, the solderability of the electrode is poor, and ifis large, the conductivity of the electrode is poor. α Therefore, as a resol-type phenol resin which
makes the hardness of the obtained electrode appropriate and combines good conductivity and
solderability, z b □□□ shown in the above-mentioned constitution is 0.8 to 1.2, respectively.
And n n a □ are suitably 1 to 2 and 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 saturated fatty acids, C16-C20
palmitic acid, stearic acid, arachic acid and the like, in unsaturated fatty acids, C-C18 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 dispersing agent is less
than 0.1 parts by weight, the 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 the piezoelectric vibrator It is not preferable because it causes a decrease
in adhesion with the A conventional organic solvent can be suitably used in the silver paste
according to the present invention in order to adjust the viscosity. For example, known solvents
such as butyl carpitol, butyl carpitol acetate, butyl cellosolve, methyl isobutyl ketone, toluene,
xylene and the like. [Example] Metallic silver powder of particle size l-, resol type phenol resin of
infrared transmittance ratio shown in Table 1, and oleic resin potassium are compounded (parts
by weight) in the ratio shown in Table 2 respectively, and some butyl carp Toll was added and
the mixture was kneaded with a three-wheel roll for 20 minutes to prepare a silver paste. In
particular, in Example 3, the metal silver powder average particle diameter was: ln, and 2 was the
same average particle diameter: 0.5 n. In order to form the electrodes 2 by applying the
respective embodiments to the both surfaces of the pseudo image substrate of the piezoelectric
vibrator 1 by screen printing as shown in the flow of FIG. Each piezoelectric vibrator 1 with the
electrode 2 is immersed for 4 seconds in an organic acid flux bath, and then immersed for 5
seconds in a molten solder bath (Pb / 5n = 40/60) at 250 ° C. for pulling up. At the same time,
hot air at a pressure of 2 to 6.0 atm and 220 to 230 ° C. was blown and then washed. At this
time, the average thickness of the solder coat soldered to the electrode 2 was 10 n. Table 2
shows the results of examining the characteristics of the electrode 2 obtained in this process.
Here, the conductivity of the electrode is a value obtained by measuring the volume resistivity of
the heat-cured electrode 2.
With the adhesion of the electrode, in accordance with the foundation test method of JIS K5400
(1979), 11 parallel lines perpendicular to each other are drawn at intervals of 1- on the coating
film to be an electrode, The number of base layers of the coating film left on the insulating
substrate was determined when the base was cut to form 100 grids and the coating was peeled
off with cellophane tape from above. . The solderability was evaluated by observing the state of
being soldered on the electrode 2 with a low magnification stereomicroscope and by the
following criteria. ○: Smooth on the surface with solder adhering to the whole surface Δ:
Partially exposed electrode × Mark 2 Two parts with solder only Printability is adjusted with
viscosity When forming the electrode 2 by the screen printing method using the silver paste
obtained, the easiness of the printing was observed and evaluated by the following criteria. O
mark: good formation of the electrode 2 Δ mark: something difficult to form the electrode 2 ×
mark: difficult to form the electrode 2 Next, the soldering strength is the glass epoxy resin
substrate ( For example, after forming a coating film with a thickness of 25 to 30μ with a land of
diameter 3 tumor on G10) and heating it for 130 to b × 10 to 60 minutes to cure the coating
film, on that land Solder the lead M (Tin metal soft copper wire of 0,8 square φ) vertically (using
63 Sn eutectic solder), fix the substrate and verticalize the lead wire at a tension rate of 50
square / minute And its strength was determined. As is apparent from this result, in each
example, the specific compounding materials are appropriately combined, so the conductivity of
the electrode (coating film), the adhesion of the electrode, the solderability, the solderability, the
printability And other characteristics are good. Further, direct soldering can be performed on the
obtained cured electrode using a conventional IIM-based FLAUX II. Next, regarding the
comparative example, since the infrared transmittance ratio of the resol type phenol resin to be
used is not appropriate in Comparative example No. 2.3, the electrode 2 having preferable
solderability can not be obtained. The comparative example 4 is not preferable because the
solder adheres only to the portion of the piezoelectric vibrator 10 in soldering because the
amount of metal silver powder is small. In Comparative Example 5, the amount of metallic silver
powder is large and the metallic silver powder is not sufficiently bound, so the conductivity of the
electrode is unstable, the obtained electrode 2 is also brittle, and the screen printability is often
difficult and not preferable. [Effects of the Invention] As described above in detail, the
piezoelectric buzzer in which the electrode is formed using the coating material for electrode
formation according to the present invention is improved in productivity because it does not
require baking at the time of electrode formation, and Since there is no risk of migration in a wet
atmosphere, which will be described later, there is an effect that the thinning of the piezoelectric
vibrator can be achieved.
Brief description of the drawings
FIG. 1 is a schematic view of an embodiment of a piezoelectric buzzer according to the present
invention, FIG. 2 is a view for explaining the production of the embodiment, and FIG. 3 is a
conventional production theory FIA.
1 ··· Piezoelectric vibrator, 2 · · · · · · · · · · · · · · · · · · · · · · · metal elastic body, 4 · · · · · · lead wire.
Below margin table 1 Below margin FIG. 1 FIG. 2 FIG. 3
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