Method and apparatus for ultra-fast aperture exposure
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United States of America Patent
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Feb 1, 2005
Grant Date -
N/A
app pub date -
Feb 20, 2003
filing date -
Feb 20, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for extremely fast opening and closing of an exposure path or optical axis. Two disk-shaped shutters are coaxially rotated in opposite directions at an initial synchronous speed so as to dynamically align openings in the discs at an angular position offset from the exposure path. The angular speeds of two of the disks are selectively increased and decreased to dynamically align the openings with the exposure path. A third masking disk may be provided, which rotates coaxially with the other two at a constant angular speed less than the angular speeds of the other two disks, to permit the invention to rapidly open and close two or more separate optical paths.
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