Method for forming halftone screen and apparatus therefor

Details Method for forming halftone screen and apparatus therefor Method for forming halftone screen and apparatus therefor

1990-12-24

1992-12-15

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 75, 358296, 358298, 358453, H04N 140, H04N 146

Patent

active

051722488

ABSTRACT:
This invention is a method for forming halftone screen to prepare a multi-color separated halftone gradation image which is printable and reproducible by superposing an image signal obtained by scanning an original comprising continuous-tone color images with a halftone screen signal generated electrically, which comprises the steps of exposing and scanning a light spot of a predetermined size at a predetermined pitch to form halftone dots, and changing the number of said pitch so as to obtain an arbitrary screen line number. Further, this invention relates to a light beam scanning apparatus for forming halftone screen to prepare a multi-color separated halftone gradation image which is printable and reproducible by superposing an image signal obtained by scanning an original comprising continuous-tone color images with a halftone screen signal generated electrically, which comprises a first laser diode for emitting a synchronizing laser beam, a second laser diode for emitting a recording laser beam, a galvanometer for inputting the synchronizing laser beam and the recording laser beam through a collimator and a mirror, a synchronizing signal generator and an image recording section for inputting laser beams reflected and deflected by said galvanometer, a PLL multiplier for outputting a synchronizing signal by inputting an electric signal from said synchronizing signal generator, and an output controlling section for driving the second laser diode in accordance with the image signal and the synchronizing signal.

REFERENCES:
patent: 4547814 (1985-10-01), Hirosawa
patent: 4691241 (1987-09-01), Tomohisa et al.
patent: 4717925 (1988-01-01), Shibata et al.
patent: 4837588 (1989-06-01), Imakawa et al.
patent: 4939590 (1990-07-01), Tada
patent: 5019896 (1991-05-01), Shimazaki

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