| 摘要 |
PROBLEM TO BE SOLVED: To realize three-dimensional inputting without recourse to angle-of- projection information on a reference light, and to obtain high-precision three- dimensional input data regardless of the precision of angle-of-projection control. SOLUTION: A reference light is projected toward a virtual surface so as to scan it, and the reference light reflected by a substance Q is received simultaneously at a first position A and a second position B separated from each other, and a point of time when the reference light reflected by the substance passes each sampling section being a fractionized virtual surface is detected, and the position of the substance Q is computed in each sampling section, on the basis of an angle of light receptionθA of the reference light at the first position A, an angle of light receptionθB of the reference light at the second position B, and the distance L between the first and second positions A, B.
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