Title:
COORDINATE INPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/1990/010902
Kind Code:
A1
Abstract:
A coordinate input device consisting of a combination of a tablet that uses electromagnetic waves of a first frequency as coordinate detection signals and an illumination unit driven by the signals of a second frequency, wherein the frequencies are so adjusted as to prevent the malfunction of the coordinate input device due to noises from electric circuits such as an inverter circuit for driving the illumination unit.
Inventors:
MURAKAMI AZUMA (JP)
CHIKAMI TOSHIHIDE (JP)
CHIKAMI TOSHIHIDE (JP)
Application Number:
PCT/JP1990/000332
Publication Date:
September 20, 1990
Filing Date:
March 14, 1990
Export Citation:
Assignee:
WACOM CO LTD (JP)
International Classes:
G06F3/038; G06F3/046; (IPC1-7): G06F3/033; G06K11/20
Foreign References:
| JPS61115240U | 1986-07-21 | |||
| JPS60175136A | 1985-09-09 |
Attorney, Agent or Firm:
Yoshida, Kiyotaka (15-11 Toranomon 1-chom, Minato-ku Tokyo 105, JP)
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