Title:
座標入力/検出装置、座標検出方法及び記憶媒体
Document Type and Number:
Japanese Patent JP4414075
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect position coordinates in the case of simultaneously indicating plural parts at a low cost. SOLUTION: In the case that a part of light projected to a coordinate input/detection area 3a is interrupted by insertion of the indication members A and B of respectively different diameter sizes in the coordinate input/detection area 3a, an image forming position and an image forming size on respective photodetectors are detected, the two-dimensional position coordinates of the indication members A and B inserted to the coordinate input/detection area 3a are calculated based on the image forming position or the like and further, the diameter sizes of the light shielding parts of the indication members A and B at the respective two-dimensional position coordinates are calculated based on the image forming size or the like. Thereafter, the two-dimensional position coordinates where the diameter sizes of the light shielding parts of the indication members A and B in the respective photodetectors almost match are extracted as the two-dimensional position coordinates actually indicated by the indication members A and B. Thus, since the position coordinates A' and B' where the diameter sizes do not almost match can be eliminated as the ones obtained by erroneous recognition, the position coordinates in the case of simultaneously indicating the plural parts are detected at a low cost.
Inventors:
Mitsuru Sato
Yasuhiko Saka
Kenichi Takekawa
Yasuhiko Saka
Kenichi Takekawa
Application Number:
JP2000241957A
Publication Date:
February 10, 2010
Filing Date:
August 10, 2000
Export Citation:
Assignee:
株式会社リコー
International Classes:
G06F3/042; G06F3/03; G06F3/041
Domestic Patent References:
| JP11327770A | ||||
| JP9319501A | ||||
| JP3273419A | ||||
| JP4018625A | ||||
| JP9091094A | ||||
| JP63269002A | ||||
| JP63223819A | ||||
| JP3244017A |
Attorney, Agent or Firm:
Hiroaki Sakai