G - Physics
06
K
340/135.1
G06K 11/06 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1118072
Abstract The invention relates generally to apparatus for translating the position of a writing instrument into electrical signals for transmission to a remote location such that the position and corresponding movements of the writing instrument may be recreated. Thus, the apparatus includes a grid drive multiplexer coupled between a clock and X and Y grid lines upon a surface. A system control is coupled between the clock and the grid drive multiplexer for controlling the energization of the grid lines by the grid drive multiplexer means. Sample and filter detector circuits are coupled between a cursor including a coil movable on the grid and system control for relating cursor position to time in a linear mode. Means are provided for coupling X and Y counters to the system control whereby gated clock pulses are accumulated in the X and Y counters to measure the position of the cursor on the grid. By comparison with prior art devices, the apparatus has a number of desirable features and advantages, including the facility for determining the position of the cursor in a continuous linear fashion by using accurate electrical interpolation techniques to determine position between grids.
332879
Fadden Brownlow J.
Prugh Richard W.
Borden Ladner Gervais Llp
Fadden Brownlow J.
Prugh Richard W.
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