| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for reading an identical read object to stabilize a read signal level acquired by each scanner only by daily light source luminous energy adjustment just by using a neutral density filter without attaching a reference film to each scanner. SOLUTION: In adjusting light source luminous energy of a scanner provided with a light source, photoelectric conversion sensor, and neutral density filter, a conversion coefficient between the reference film and the neutral density filter is calculated from influences obtained in advance on a read signal level by the reference film arranged on an optical axis and influences on the read signal level each time by the neutral density film arranged on the optical axis. A target value of the read signal prescribed in making the reference film as an object to be read is converted into a target value of the read signal in making the neutral density filter the object to be read on the basis of the conversion coefficient and, to the converted target value, the level of the read signal in making the neutral density filter as the object to be read is matched. COPYRIGHT: (C)2007,JPO&INPIT
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