Piezoelectric device responsive to optical image for generating

Details Piezoelectric device responsive to optical image for generating Piezoelectric device responsive to optical image for generating

1975-03-21

1978-07-04

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

250211R, 310328, H04N 314, H01J 3912, H01L 4104

Patent

active

040992063

ABSTRACT:
A piezoelectric substrate is subjected to the continuous excitations produced by a high-frequency electric field of fixed radian frequency .alpha. applied between its two opposite faces; high-frequency electrical pulses of radian frequency .alpha..sub.p are applied to the periodic network of conductors illuminated by the image; the electrical conductivity at the surface of the substrate at each point is made a function of the illumination directed towards said point, for example by the application of a photoconducting semi-conductor covering the network or by a substrate whose conductivity is directly modulated by the incident light. The non-linear interaction between the two substrate excitations induces a surface wave whose intensity is modulated by the luminous intensity and which is picked up by the transducers. Application with fixed .alpha..sub.p, to the point by point read-out of a linear optical image and with .alpha..sub.p = .alpha..sub.p (t) to the analysis of its spatial frequencies.

REFERENCES:
patent: 3446975 (1969-05-01), Adler et al.
patent: 3826865 (1974-07-01), Quate et al.
patent: 3826866 (1974-07-01), Quate et al.
patent: 3836712 (1974-09-01), Kornreich et al.
patent: 4041536 (1977-08-01), Melcher et al.

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