Rotor Optics Imaging Method and System with Variable Dose During Sweep
First Claim
1. A method of adjusting exposing doses that vary and accumulate along first axis of a workpiece as a writer sweeps a curved path that is not parallel to the first axis, the method including:
- determining a direction of sweep of a scanning head when writing a particular pixel of a rasterized image onto a workpiece or reading a particular pixel from the workpiece;
looking up in a computer readable storage medium or calculating a correction factor based at least in part on an angle of the direction of sweep relative to a first axis of the workpiece; and
applying the correction factor for the particular pixel to adjust a cumulative intensity at the workpiece of the particular pixel.
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Accused Products
Abstract
The technology disclosed relates to translating between a Cartesian grid and a curved scanning path that produces varying exposure doses as the scanning head traces the curved scanning path. It can be applied to writing to or reading from a workpiece. In particular, we teach use of varying exposure dose that compensates for the time it takes for the curved scan path to transit a straight axis. This simplifies either modulation of a modulator, from which data is projected onto the workpiece, or analysis of data collected by a detector, onto which partial images of the workpiece are projected.
32 Citations
20 Claims
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1. A method of adjusting exposing doses that vary and accumulate along first axis of a workpiece as a writer sweeps a curved path that is not parallel to the first axis, the method including:
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determining a direction of sweep of a scanning head when writing a particular pixel of a rasterized image onto a workpiece or reading a particular pixel from the workpiece; looking up in a computer readable storage medium or calculating a correction factor based at least in part on an angle of the direction of sweep relative to a first axis of the workpiece; and applying the correction factor for the particular pixel to adjust a cumulative intensity at the workpiece of the particular pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cumulative intensity adjusting device including:
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a sweep direction calculator that determines the direction of sweep of the scanning head when a particular pixel of a rasterized image is written onto a workpiece; a lookup memory or program function that determines a correction factor that is based at least in part on an angle of the direction of sweep relative to the axis; and a correction calculator that is coupled to the sweep direction calculator and the lookup memory or program function, wherein the correction calculator uses the least the direction of sweep to determine the correction factor, the correction calculator applies the correction factor to a raw pixel value, and outputs a corrected pixel value to memory. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification