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JPH01144897

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DESCRIPTION JPH01144897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method for producing a printed ceramic beaker or microphone used in an electronic device such
as a sensor of a switch for manual operation of a key and a speaker of a thin acoustic product.
[Prior Art] Conventionally, a ceramic beaker thinly slices PZT and bonds it to an acoustic plate
(reinforcement plate). [Problems to be Solved by the Invention] The conventional manufacturing
method requires advanced technology and machinery in manufacturing. In addition, since the
mold must be manufactured according to the product shape, the cost is high, and it is not
suitable for high-mix low-volume production. [Means for Solving the Problems] Therefore, the
present invention relates to PZT (lead zirconium titanate) on a fine pitch comb-like circuit formed
by etching or conductive ink on a film such as a thin polyester sheet. The ink prepared by mixing
the binder with the powder of the above is printed or coated, and a DC voltage is applied to the
circuit to thermally cure the PZT ink. As described above, since the present invention uses PZT as
an ink, it can be easily screen-printed on a polyester film or the like, and can cope with high-mix
low-volume production. Therefore, low-cost product manufacture becomes possible, and by
thermally curing the PZT ink from application of a DC voltage, fluid PZT particles are efficiently
polarized. Next, the embodiment will be described according to the embodiment shown in the
drawings. First, a comb-like circuit of fine pitch is formed on the thin film 1 such as polyester by
etching or conductive ink, and then electric current at both ends! Except for 2.3, the PZT powder
is mixed with a binder material, for example, a polyester resin, to form a PZT ink 4 by printing or
coating, and the PZT ink 4 is heated while applying a DC voltage between the electrodes 2 and 3
It hardens and polarizes the fluid PZT particles efficiently to make a speaker. And when an
electrical signal is given to this speaker, it will make a sound. As shown in FIG. 3, the speaker
manufactured in this manner is further increased in sound pressure level by multiple printing
with a layer 5 of UV (ultra violet) insulating ink or the like interposed therebetween. Can. Of
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course, this speaker can be used as a microphone by giving an audio signal in reverse. [Effects of
the Invention] According to the manufacturing method of the present invention, since it can be
manufactured by printing, it is simple, and it is most suitable for small-lot production of many
varieties, and it can be manufactured at low cost. The sound pressure level can be increased by
printing.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows a comb-like electrode.
FIG. 2 is a view showing a state covered with PZT ink. FIG. 3 is a view in the case of stacking. 1
polyester film 2 electrode 3 electrode 4 PZT ink 5 UV insulating ink, etc.
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