Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1995-07-10
1997-09-30
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055939, 25055945, 25055904, 356373, 356237, G01N 2189
Patent
active
056728859
ABSTRACT:
A surface displacement detection system including a detector for detecting displacement of a surface in a direction normal to the surface as the surface revolves; an encoder which divides the surface into N sectors; a signal processor responsive to the detector for calculating the amount of displacement of the surface in each sector of the surface as it revolves; a displacement value look-up table; and a routine for writing to the table a displacement value for each sector once per M revolutions, and an adjustment system including a focussing actuating element, a routine to read displacement value look-up table, a routine to for updating the position of the focussing actuating element for every sector, according to the displacement values stored in the look-up table.
REFERENCES:
patent: 4423331 (1983-12-01), Koizumi et al.
patent: 4794265 (1988-12-01), Quackenbos et al.
patent: 4930115 (1990-05-01), Verboom et al.
patent: 4954723 (1990-09-01), Takahashi et al.
Allen Nicholas
Broude Sergey
Broudour Abdu
Chase Eric
Johnson Carl
Allen Stephone
QC Optics, Inc.
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