Digitizer with floating scan

Details Digitizer with floating scan Digitizer with floating scan

1981-02-12

1983-01-11

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

H04N 100, G08C 2100

Patent

active

043683525

ABSTRACT:
A digitizer having a pointer or cursor driven by an alternating carrier signal and a grid of sequentially enabled parallel spaced conductors inductively coupled to the cursor in which enabling of the conductors is initiated at an origin conductor and continues with a serial scan of the conductors until a phase change is detected when the cursor is between the origin conductor and an enabled conductor. The grid is sub-divided into overlapping sections which are scanned in sequence until the pointer is located. After the pointer is located, the conductor enabling scans begin at a conductor enabling device a predetermined distance from the enabling device actuated when pointer position was detected. Means are provided for re-initiating conductor enabling scans at the origin conductor in the absence of detection of the pointer.

REFERENCES:
patent: 3904822 (1975-09-01), Kamm et al.
patent: 4080514 (1978-03-01), Pobgee
patent: 4080515 (1978-03-01), Anderson
patent: 4088842 (1978-05-01), Ikedo
patent: 4243843 (1981-01-01), Rocheleau
patent: 4260852 (1981-04-01), Fencl

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