Method for producing a halftone plate

Details Method for producing a halftone plate Method for producing a halftone plate

1981-12-31

1984-05-08

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, H04N 122

Patent

active

044478330

ABSTRACT:
A method for producing a halftone plate from an original picture having a continuous tone. A record film is exposed at least one exposure light beam of a smaller size than a halftone dot area by independently controlling it to turn on or off according to a picture signal. The luminous energy of the exposure light beam is controlled depending on a reference value corresponding to the picture signal and a position signal value varied depending on an exposing position in the halftone dot area to be exposed by the exposure light beam. The control of the luminous energy is performed by the sum, the difference, the product or the quotient of the two signal values. A plurality of reference values or position signal values may be used.

REFERENCES:
patent: 4196453 (1980-04-01), Warren

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