Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-05-26
1983-07-12
Orsino, Jr., Joseph A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250233, 250333, H04N 533
Patent
active
043934030
ABSTRACT:
By rotating a diaphragm in front of a pickup device, for example a pyroelectric vidicon, eddy currents are generated in the diaphragm if the diaphragm is made of a metal. These eddy currents are generated as a result of the interaction between the moving diaphragm and the magnetic field of the deflection coils of the vidicon. If the diaphragm is instead made of an insulating material, separation of charges occurs on it as a result electrostatic generation, due to the interaction between the diaphragm and the electrostatic field of the vidicon. Compensation of the charge separation causes interference in the video signal. According to the invention a diaphragm of an insulating material is used which is covered with a pattern of electrically conductive tracks or a very high resistance layer. As a result of this no eddy currents and no noteworthy electrostatic charges can occur, so that an interference-free video signal is obtained.
REFERENCES:
patent: 3352156 (1967-11-01), Beitz
patent: 4227210 (1980-10-01), Nixon
patent: 4322620 (1982-03-01), Steinhage
Geis Hans P.
Helber Holger
Orsino Jr. Joseph A.
Schechter Marc D.
U.S. Philips Corporation
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