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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.

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First Claim