Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-02-10
1987-04-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
358293, H01J 314
Patent
active
046616993
ABSTRACT:
Apparatus (10) for controlling a beam (12) of coherent light includes a reference scale (38, 138) provided with indicia forming a plurality of spokes having two sets of properties. The first of the two sets of properties is an evenly spaced first set of edges (41) arranged for generating a data clock exactly referenced to a position of a first of the two separate, perpendicular directions. A second set of edges (44) are each spaced variably from an associated one of the first set of edges (41) as a function of the other of the two separate, perpendicular directions, making the second of the two sets of properties a variable width of each of the spokes.
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Welmers Thomas E.
Whitney Theodore R.
Nelms David C.
Oen William L.
T. R. Whitney Corporation
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