Low cost field emission based print head

Details Low cost field emission based print head Low cost field emission based print head

1998-06-01

1999-07-27

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347238, 313494, B41J 2435, H04N 123

Patent

active

059298871

ABSTRACT:
A photoprinter is described, including a print head comprising three parallel substrates, with the space between them being permanently evacuated. The middle substrate is divided into left and right parts with a space left between them. Suitable gettering means is located inside said space. The right side of the middle substrate supports a unilinear or trilinear array (for monochrome and color respectively) of microtips that rest on cathode columns. Gate lines, orthogonally disposed relative to the cathode columns are located at the top level of the microtips and have openings through which the microtips can emit electrons, due to field emission, which bombard nearby conductive phosphor layers, thereby emitting light. Microtips and phosphor layers are placed close together so that proximity focusing of the electrons is adequate. This allows the print head to be placed close to the surface of a rotatable photosensitive drum. A method for manufacturing the print head is described.

REFERENCES:
patent: 4794062 (1988-12-01), Oka et al.
patent: 5012279 (1991-04-01), Nakajima et al.
patent: 5015912 (1991-05-01), Spindt et al.
patent: 5112709 (1992-05-01), Yamazaki et al.
patent: 5153483 (1992-10-01), Kishino et al.
patent: 5229331 (1993-07-01), Doan et al.

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