| 摘要 |
PURPOSE:To output a clear image at an identical time over entire picture elements in a frame, by switching the power source of an illumination light source only for a prescribed time in the invalid section of an image sensor. CONSTITUTION:In the picture signal C of the image sensor 3, a constant invalid section (a) exists between the end and the start of one picture, and a frame synchronizing signal B is always generated in the invalid dection (a). Then, the frame synchronizing signal B is inputted to a discrimination circuit 4, and at the discrimination circuit 4, an illumination ON/OFF signal D with length not exceeding the invalid section (a) is generated based on the frame synchronizing signal B. A switching circuit 5 is driven by the signal D, and the illumination light source 6 is turned ON/OFF. When the illumination light source 6 is turned ON, that is, illumination is lit, information at that time are accumulated simultaneously.
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