Method for making a piezoelectric stack

Details Method for making a piezoelectric stack Method for making a piezoelectric stack

1992-09-21

1993-12-21

Hall, Carl E.

Metal working

Piezoelectric device making

310328, 310338, 310340, 310342, H01L 4122

Patent

active

052711331

ABSTRACT:
A method for making a piezoelectric stack. The stack includes a plurality of piezoelectric discs interleaved with a plurality of electrodes. Each disc has two opposing surface facets. Each electrode has a thin planar section having two opposing planar surfaces. The planar section is adapted to contact a substantial portion of the surface facets of two adjacent discs. The method includes the steps of cutting a cylindrical piezoelectric ceramic slug into discs. The two opposing surface facets of each disc is formed substantially parallel to one another and have a predetermined surface roughness. The method includes the steps of applying a conductive layer to the surface facets and etching the planar surfaces of the electrodes with an acidic solution. The etching step causes the planar surfaces to achieves a surface roughness similar to that of the predetermined surface roughness of the disc surface facets. Finally, the method includes the step of alternatively interleaving a first and second plurality of electrodes with a plurality of discs to form the piezoelectric stack.

REFERENCES:
patent: 3187242 (1965-06-01), Schick
patent: 3501099 (1970-03-01), Benson
patent: 3589345 (1971-06-01), Benson
patent: 4011474 (1977-03-01), O'Neill
patent: 4078284 (1978-03-01), Capek et al.
patent: 4228482 (1980-10-01), Bouchard et al.
patent: 4514247 (1985-04-01), Zola
patent: 4970182 (1990-11-01), Shirasaki

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