Optical: systems and elements – Light control by opaque element or medium movable in or... – Slit type
Patent
1991-10-28
1994-09-27
Ben, Loha
Optical: systems and elements
Light control by opaque element or medium movable in or...
Slit type
359389, G02B 2602, G02B 2106
Patent
active
053511506
ABSTRACT:
An improved aperture for a scanning microscope as is used to mask either or both of the incident light and reflected light includes a plurality of continuous curvilinear slits spaced evenly about a common origin, each of which approximates an Archimedes' spiral emanating from the origin centered on the aperture. There are two embodiments of the invention disclosed, both of which have a true Archimedes' spiral to define the inner edge of the continuous slit. In a first embodiment, the outer edge is defined as having a constant proportional circumferential aperture distance from the inner spiral. In the second embodiment, the outer edge is defined as another Archimedes' spiral having a constant offset of minimum distance from the inner spiral. However, the outer edges of the two embodiments essentially merge in a physical sense after only several of the inner revolutions of the continuous slit so that the continuous slit of either embodiment provides an image having uniform masking and uniform resolution. An alternate to these embodiments has a slit with an imaginary centerline wherein each edge is a constant minimum distance from the centerline.
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Lichtman Jeffrey W.
Thomas Lew
Ben Loha
Phan James
Washington University
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