Title:
座標入力装置
Document Type and Number:
Japanese Patent JP4125200
Kind Code:
B2
Abstract:
A coordinate input apparatus includes a light-receiving unit arranged in a coordinate input region, a reflection unit arranged at the peripheral portion of the coordinate input region to reflect incident light, and a light-emitting unit which illuminates the coordinate input region with light. Angle information corresponding to a point which crosses a predetermined level in a light amount distribution obtained from the light-receiving unit is calculated. The coordinates of the pointed position are calculated on the basis of, of a plurality of pieces of calculated angle information, angle information corresponding to direct reflected light from the pointing means, the direct reflected light being generated by the light-emitting unit.
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Inventors:
Hajime Sato
Application Number:
JP2003286158A
Publication Date:
July 30, 2008
Filing Date:
August 04, 2003
Export Citation:
Assignee:
Canon Inc
International Classes:
G06F3/042; G06F3/03; G06F3/041; G09G5/08
Domestic Patent References:
| JP2043613A | ||||
| JP2002032188A |
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
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