Coordinate reading apparatus

Details Coordinate reading apparatus Coordinate reading apparatus

1988-08-11

1991-06-18

Fleming, Michael R.

Boots, shoes, and leggings

3642368, 3649271, G02B 714, G08C 2100, G09G 300

Patent

active

050254103

ABSTRACT:
A coordinate reading apparatus for inputting coordinate data to a computer and operable in either a relative coordinate mode or an absolute coordinate mode, the apparatus including a tablet defining a coordinate surface and a coordinate designator movable across the surface so that signals are generated which are inversely proportional to the distance between the designator and the surface. In order to derive an indication of the position of the designator relative to the surface, the generated signals are compared with a reference signal and an output is produced only when the maximum generated signal exceeds the reference signal. The value of the reference signal is varied in dependence on which coordinate mode is to be employed.

REFERENCES:
patent: 3732557 (1973-05-01), Evans et al.
patent: 4617515 (1986-10-01), Taguchi et al.
patent: 4786765 (1988-02-01), Yamanami et al.
patent: 4794209 (1988-12-01), Asada et al.
patent: 4806918 (1989-02-01), Berke et al.
patent: 4810838 (1989-03-01), Ichinokawa et al.
patent: 4910363 (1990-03-01), Kobayashi et al.

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