Electrically controllable printing form for a printing machine

Details Electrically controllable printing form for a printing machine Electrically controllable printing form for a printing machine

1989-10-17

1992-04-28

Miller, Jr., George H.

Recorders

Electric recording

Electrochemical

101401, 400119, G01D 1506, B41B 102, B41J 2716

Patent

active

051092409

ABSTRACT:
To permit computer control, for example from a control console in a publisher's office, of the subject matter to be printed from a printing cylinder, the printing cylinder (3) has a layer of semiconductor material thereon, which, by doping, includes capacitative or inductive domains (15, 33), selectively energized in accordance with control from the computer through controllable electronic switches (16, 29), such as transistors formed in the semiconductor layer. Ferrofluidic ink can be attracted by charges onto capacitors formed in the semiconductor layer; the capacitors are charged, selectively, through the transistor electronic switches which are located and connected in a matrix. Packing densities of over 160 domains and switching elements per mm.sup.2 are readily possible and suitable, for example, for newspaper printing. Higher packing densities, for high quality printing, can be obtained by well known microelectronic technology. Further, depolarized regions are hydrophobic, and permit acceptance of printing ink, whereas polarized domains are hydrophilic, attract water, thereby permitting use of well known lithographic-type offset printing.

REFERENCES:
patent: 3678852 (1972-07-01), Feinleib et al.
patent: 4030107 (1977-06-01), Tagawa
patent: 4448867 (1984-05-01), Ohkubo et al.
patent: 4748464 (1988-05-01), Pannekoak et al.
patent: 4833990 (1989-05-01), Hirt et al.
patent: 4897676 (1990-01-01), Sedberry

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