Device for the amplitude modulation of an electrical signal

Details Device for the amplitude modulation of an electrical signal Device for the amplitude modulation of an electrical signal

1975-08-26

1977-03-15

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Recording apparatus

310 81, 310 98, 332 3, 332 26, H04N 314

Patent

active

040125866

ABSTRACT:
A device for scanning patterns, e.g. optical patterns, in which on the surface of a piezo-electric material Bleustein-waves are produced, while in the material or in a semi-conductor layer deposited on the surface a drift field is produced. Said drift field pulsates between two levels, a low level at which the gain of the surface wave is independent of the "exposure" pattern and a high level at which the surface wave is locally amplified in accordance with the "exposure" pattern.

REFERENCES:
patent: 3314022 (1967-04-01), Meitzler
patent: 3555180 (1971-01-01), Cook
patent: 3826865 (1974-07-01), Quate
patent: 3836712 (1974-09-01), Kornreich
patent: 3869682 (1975-03-01), Heeks
patent: 3886503 (1975-05-01), Bert
patent: 3970778 (1976-07-01), Adkins
patent: 3972011 (1976-07-01), Coussot
"Bleustein-Wave Amplification in Photoconducting CdS.", Electronic Letters, Feb. 1972, vol. 8, No. 3, pp. 60-62.

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