Absolute position controller
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United States of America Patent
Stats
-
Mar 21, 1989
Issued Date -
N/A
app pub date -
May 22, 1987
filing date -
Jun 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for determining the absolute position of a point on a surface or along a path including a tablet, scale, or overlay and a moveable mouse-type cursor. The tablet includes a unique pattern of lines or regions along rectilinear or other axes. A series of adjacent spaces formed by the lines define unique cells on the tablet. The mouse includes one or more linear imaging arrays adapted to detect the presence of tablet lines adjacent thereto. An integrated processor identifies the line types, computes line spacings and ratios, and identifies subtending cells by comparison to the known tablet topography. The processor further computes the precise location of a point defined on the mouse.
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