| 摘要 |
According to the improve method for use with image inputting apparatus to set the illuminance of reading light, the measurement with the image sensor is performed with the light source stop being adjusted to a specified initial value of degree of opening in the absence of original in an optical path and if an output from the image sensor is not within a specified range, either adjustment of the quantity of the light from the source or readjustment of the light source stop using a light source stop table which represents the relationship between the degree of opening of the light source stop and the output of the image sensor or both the adjustment of the quantity of the light from the source and the readjustment of the light source stop are performed and another measurement with the image sensor is performed in the absence of original in the optical path and these steps are repeated until the output from the image sensor comes to fall within the specified range, and if the output falls within the specified range, the corresponding quantity of the light from the source and the corresponding degree of opening of the light source stop are set as values representing the reference state of the light source for the image reading mode. The setting of the illuminance for setting the basic quantity of image reading light in the image reading apparatus can be accomplished easily and with high efficiency.
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