Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1975-09-12
1977-05-17
Habecker, Thomas B.
Facsimile and static presentation processing
Facsimile
Recording apparatus
346163, H04N 100
Patent
active
040243400
ABSTRACT:
Apparatus for electrically burning information from an original document into stencil material comprising a stylus for applying electrical pulses to the material and an electrical circuit comprising an optical sensor for scanning information on the original and providing an output signal, the amplitude of which is proportional to the light reflected by the information, a circuit for providing a pulse train the shape of which conforms to the non-linear characteristics of the stencil material and a comparator for combining the output signal and pulse train to provide the electrical pulses having a width determined by the combination for application to the stylus, includes circuitry interposed between the optical sensor and the comparator for setting the minimum and maximum amplitudes of the output signals from the optical sensor representing tones to be reproduced as black and white, respectively. A first circuit portion for setting the minimum black level includes an operational amplifier having first and second inputs and an output, the output of the optical sensor being coupled to the first input and a variable voltage applying circuit being coupled to the second input. The provision at the output of the amplifier of a predetermined voltage indicates the minimum level of voltage from the optical sensor for the reproduction of black tones. A second operational amplifier having first and second inputs and an output is coupled at the first input to the output of the first operational amplifier with the second input of the operational amplifier being coupled to the output thereof and to a second variable voltage applying circuit. Upon production of a predetermined output voltage at the output of the second operational amplifier, the maximum level of voltage for reproduction of white tones is set. The operational amplifiers are sequentially set by positioning the optical sensor adjacent information representing black and white, respectively, and thereafter adjusting the respective variable voltage applying circuit.
REFERENCES:
patent: 3801738 (1974-04-01), Egerton
patent: 3952144 (1976-04-01), Kolker
Habecker Thomas B.
Lucyshyn Peter S.
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