Method and apparatus for holding a film transparency in a rotary drum scanner
AssigneeICG Limited
InventorsAlan R. Dresch, Stephen C. Smith, Andrew G. Sokoloff
Life of this patent
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Abstract
A film transparency (7) is held by centrifugal force with its emulsion side in contact with the inside of the transparent drum (1) of a rotary drum scanner (1, 2, 3) used in a graphic reproduction process. A transparency locator is in the form of either an insert (4) or a clip device (20) and serves to hold the film transparency in position until the drum is rotating at a sufficiently high speed.
Claims25
A method of holding a film transparency in a rotary drum scanner comprising:
- providing a rotary drum scanner having a transparent cylindrical drum and means for rotating said drum about its longitudinal axis, said drum having an inside and an outside surface:
- providing a film transparency having an image portion and an emulsion-containing side thereon;
- rotating said drum about its axis while holding the film transparency including the image portion thereof with its emulsion side in contact with the inside surface of said drum solely by the centrifugal force exerted thereon, as said drum is rotated.
A transparency locator for locating a film transparency to a cylindrical drum of a rotary drum scanner, said drum having an inside and an outside surface, said transparency locator comprising:
- means for mounting said transparency locator within said drum;
- and
- means for holding the film transparency in position against the inside surface of said drum until said drum is rotating at a sufficiently high speed for the film transparency, including the image portion thereof, to be forced centrifugally into contact with the inside surface of said drum.
A rotary drum scanner for scanning an image from a film transparency comprising:
- a transparent cylindrical drum to which the film transparency is to be mounted for scanning, said drum having an inside surface and an outside surface:
- means for rotating said drum about its longitudinal axis;
- means for mounting the transparency locator within said drum wherein the transparency locator holds the film transparency until the drum is rotating at a sufficiently high speed for the film transparency to be forced centrifugally into contact with the inside surface of said drum.
Dependencies are inferred from the claim text.