Printing process using lithographic plates made from toned ampli

Details Printing process using lithographic plates made from toned ampli Printing process using lithographic plates made from toned ampli

1979-11-30

1982-04-06

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Recording apparatus

346 742, H04N 128

Patent

active

043239293

ABSTRACT:
A lithographic printing process wherein an illuminated image on a document is scanned in a series of parallel sweeps with a photocell, applying an electric wave signal to a magnetic recording head with the amplitude of said signal determined by the output of the photocell and a function of the optical density of the image being scanned. The magnetic head has a width of from about 0.5 mils to about 5 mils and traverses a magnetic recording medium in a series of aligned parallel paths analogous to those scanned by the photocell to form a latent magnetic image in the magnetic recording medium, which image is a replica of the image being scanned. The horizontal spatial frequency is from about 200 to 1000 cycles/inch. The thus formed latent magnetic image is decorated with an oleophilic magnetic toner. The oleophilic magnetic image is transferred under pressure to a smooth heated lithographic substrate. If necessary, the toner is further heated to effect complete coalescence thereof. The thus formed lithographic printing plate is then used for lithographic printing.

REFERENCES:
patent: 2826634 (1958-03-01), Atkinson
patent: 3108281 (1963-10-01), Uemura
patent: 3185777 (1965-05-01), Rheinfrank
patent: 3554798 (1971-01-01), Nacci
patent: 3555556 (1971-01-01), Nacci
patent: 3627682 (1971-12-01), Hall
patent: 3804511 (1974-04-01), Rait
patent: 3861952 (1975-01-01), Tokumoto
patent: 3911483 (1975-10-01), Kihara
patent: 4090880 (1978-05-01), Chu
patent: 4195303 (1980-03-01), Edwards
"Side Fringing Fields & Write & Read Crosstalk of Narrow-Magnetic Recording Heads" by Herk, IEEE Transactions of Magnetics, Mag-13, 1021 (1977).
Handbook of Thin Film Technology by Missel et al., McGraw-Hill Book Co. pp. 6-13 to 6-17.

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