| 摘要 |
PROBLEM TO BE SOLVED: To make unevenness in an image display such as a flicker or the like not occur in an output image even when an alternate current lighting light source is used in an illumination equipment used with an optical sensor. SOLUTION: The alternate current lighting light source 9 is used in the illumination equipment, such as image input equipment, which has an optical sensor or the like. The above illumination equipment 3a has a signal generator 3a, which generates a clock signal for lamp switching for carrying out the alternate current driving of the above light source, so that an integration value of the illumination quantity of the above light source in the optical accumulation time of the above optical sensor can be constant, and drive lighting circuit 5, 7, which perform the alternate current lighting of the above light source 9 based on the above clock signal for lamp switching. |
