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US 5,818,498 AGranted
Method of multi-channel thermal recording
AssigneeCreo Products Inc.
InventorsDouglas Richardson, Michel Laberge
Life of this patent
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Abstract
When exposing thermally imageable materials using a multi-channel exposure head, an overlap of at least one channel is used to avoid a visible border at the point where one group of channels, written at the same time, meets a second group of channels. The overlapped area is written twice with identical data.
Claims4
A method for reducing visible exposure differences between adjacent sets of pixels recorded on a thermally sensitive recording medium using a multi-channel laser imaging system having K lasers, the method comprising the steps of:
- (a) transporting the thermally sensitive recording medium in a first direction;
- (b) writing a first set of K pixels on the thermally sensitive recording medium based upon a first group of data;
- (c) transporting said laser imaging system in a second direction perpendicular to said first direction to a position in which N of said K lasers overlaps and registers with at least N pixels of said first set of pixels, where N is less than K;
- and
- (d) writing a second set of K pixels based upon a second group of data in which information used to control the N overlapping lasers is identical to information used to write the N pixels of said first set of pixels in step (b).
2 more elements
Dependencies are inferred from the claim text.