Method of and apparatus for detecting coordinate position...

Details Method of and apparatus for detecting coordinate position... Method of and apparatus for detecting coordinate position...

2007-04-17

2007-04-17

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S559120

Reexamination Certificate

active

11091579

ABSTRACT:
It is an object of the present invention to perform a coordinate position detection not involving detection miss, even if a drawing process frequently involves detection interruptions on a display surface. A method of the invention comprises: performing a scanning in a first scanning area corresponding to the width of the display surface at the time of an initial detection of a shading object; performing, when continuing the detection of the shading object, a scanning in a second scanning area whose scanning region is an area near the latest detection position; performing, after an interruption in the detection of the shading object, a scanning in a third scanning area which is broader than the second scanning area but narrower than the first scanning area, within a predetermined time period and with the detection position of a continued detection serving as reference.

REFERENCES:
patent: 5789739 (1998-08-01), Schwarz
patent: 2001-306241 (2001-11-01), None

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