Absolute position controller

Details Absolute position controller Absolute position controller

1987-05-22

1989-03-21

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340710, 250237R, G08C 2100

Patent

active

048145530

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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patent: 4411016 (1983-10-01), Wakeland
patent: 4543571 (1985-09-01), Bilbrey et al.
patent: 4564835 (1986-01-01), Dhawan

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