Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1994-12-27
1997-06-10
Reinhart, Mark J.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
347153, 347264, B41J 239, B41J 2395, B41J 240
Patent
active
056381026
ABSTRACT:
In a page or a line printer, a printer head comprises a resilient substrate, as of borosilicate glass, a strain responsive film of a first ferroelectric material, such as lead zirconate titanate, on the substrate, and a voltage responsive film of a second ferroelectric material, such as lead lanthanum zirconate titanate, on the strain responsive film to form a stack. Responsive to a driving signal representative of a pattern, a piezoelectric driving member inverts, into an inverted residual polarization representative of the pattern as a latent image, an initial residual polarization which is preliminarily produced in the voltage responsive film in its thickness direction by application of a driving voltage to the piezoelectric driving electrode member. The signal or the voltage produces in the substrate a travelling elastic wave which gives a strain and an electric voltage in compliance with the strain. The electric voltage gives rise to the residual polarization. Preliminary charged to a polarity opposite to that of the latent image, an electrostatic toner is supplied to a first end of the voltage responsive film and moved towards a second end by a travelling elastic wave produced in the substrate concurrently with supply of the toner to the first end by supplying a signal to the piezoelectric driving electrode member for production of a toner moving travelling elastic wave.
Anderson L.
NEC Corporation
Reinhart Mark J.
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