Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1992-01-15
1992-10-27
Grimley, A. T.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
G01D 942
Patent
active
051593521
ABSTRACT:
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 lens 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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Ferla Guillermo S.
Haimberger Walter P.
Hartmann Robert F.
Caufield Francis J.
Grimley A. T.
Polaroid Corporation
Royer William J.
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