Patent ID: 7616296

Claim:
A detecting machine for scanning a sheet-like object fed in a scanning direction and optically detecting compositions of the object, the detecting machine comprising: a first-side light emitting device and a first-side light detecting device disposed close to each other on a first side of the object, wherein the first-side light emitting device includes a plurality of light emitting elements emitting first light beams, the first light beams are wider along a direction perpendicular to the scanning direction than along a direction parallel to the scanning direction, and the first-side light detecting device has a light detecting area that is wider along the direction perpendicular to the scanning direction than along the direction parallel to the scanning direction; and an emission controller for controlling the first-side light emitting device, wherein the first-side light detecting device detects first-side reflected light emitted from the first-side light emitting device and reflected from the first side of the object.