Optical printing system with discontinuous print medium

Details Optical printing system with discontinuous print medium Optical printing system with discontinuous print medium

H - Electricity

04

N

H04N 1/06 (2006.01) B41J 2/47 (2006.01) B41J 2/52 (2006.01) H04N 1/08 (2006.01) H04N 1/23 (2006.01)

Patent

CA 2062113

7737 ABSTRACT OF THE DISCLOSURE A printing system employs a rotating drum for carrying a photosensitive printing medium in the form of a discontinuous sheet, there being a clamp carried by the drum and rotating therewith for holding ends of the sheet to secure the sheet to the drum. The system includes a print head having a laser beam which is spatially and temporally modulated for gray-scale printing of individual pixels of an image. The head is scanned parallel to an axis of the drum. A servomechanism responsive to angular orientation of the drum produces a linear scan during rotation of the drum. An optical system within the head provides a common path through a common objective lens for both a write laser beam and for a focus laser beam of an automatic focusing apparatus which positions the objective tens rapidly by a dither motion to compensate for undulations in the surface of the print medium. The objective lens is carried at a reference position during passage of the clamp, the reference position being updated periodically by measurements of focus.

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