G - Physics – 01 – B
Patent
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B
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G01B 11/00 (2006.01) G01B 3/10 (2006.01) G01D 5/347 (2006.01)
Patent
CA 1175222
ABSTRACT OF THE DISCLOSURE An optical sensing system for coilable extensible tape rules and the like comprising a movable elongated tape blade having optical markings forming a grid along the length thereof, photoelectric detector means spaced from said grid, a light source for illuminating a portion of said grid as it moves relative to said detector means, an optical mask between said grid and said detector means, objective lens means intermediate said tape grid and said optical mask, said lens means being effective to focus a sharp clear image of said illuminated grid portion on said optical mask whereby said mask provides a uniform modulation of the light image signal through said mask, and field lens means immediately adjacent and downstream of said mask for concentrating the light signal passing through and modulated by said optical mask and directing the concentrated composite signal onto said detector means.
401812
Betensky Ellis I.
Hildebrandt William J.
Marks & Clerk
The Stanley Works
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