Back to results
US 4,288,701 AGranted
Mark sensing detector
AssigneeSperry Corporation
InventorRoy K. Hill
Life of this patent
Estimating the term…
Abstract
Apparatus for sensing marks on a moving paper object includes light source means for transmitting light through a portion of a partially opaque mark and into the translucent fibers of a paper object. Light detecting means are provided for sensing the relative amount of light transmitted into said fibers by detecting the light in said fibers under said mark at an area transversely disposed from the portion of the mark where the light was applied.
Claims11
Apparatus for sensing partially opaque marks on a fiber paper object comprising,
- light source means adapted to be directed through a portion of a mark to be sensed and into the fibers of the paper object,
- means for concentrating the light rays from said light source means,
- said means for concentrating the light rays, terminating in an open throat portion having an outlet for the light rays smaller than the mark to be sensed,
- light detecting means comprising a detector and logic sensing means,
- light separation means forming a baffle between said light source means and said light detecting means for inhibiting the passage of reflected light from said light source means,
- light directing means for directing light from the fibers at a point adjacent said throat portion to said detector, and
- said logic sensing means being coupled to said detector for indicating when a mark first blocks said throat portion and when said mark is both opposite said throat portion and said point adjacent said throat portion being detected by said light detecting means.
4 more elements
A method for sensing partially opaque marks on a fiber paper object comprising the steps of:
- placing a mark to be sensed at a sensing station,
- directing a source of high-intensity light through a portion of said mark and into the fibers of said paper object below said mark, and
- detecting the relative amount of light being transmitted transversely through said fibers of said paper object by detecting the light in a portion of said fibers at a point adjacent the portion of the mark being exposed to said high-intensity light.
Dependencies are inferred from the claim text.