| 摘要 |
PURPOSE:To remove the black belts at the boundary of external information and original by removing the residual electrostatic charge occuring in the operation of shutter before or after the optical projection of external information in the method of recording the external information and original as composite images. CONSTITUTION:The opening and closing operations of the shutter which opens and closes the optical path for the opticl images of the original are controlled by the leading- and trailing-end detecting signals S1, S2 of the original, and the times T1, T2 at which the shutter is half open exist in the shutter operations. There is a deviation in the radiating position of the original and external information on the photoreceptor. In order to remove the residual electrostatic charge on the photoreceptor owing to the above two points, the external information luminance signal is corrected like composite luminance signal by the opening and closing time correcting signals V1, V2 and position deviation correcting signals U1, U2 made from the delay change-over signals S1', S2' and T1, T2. As a result of the above, the above- mentioned residual electrostatic charge enables the prevention of the production of any black belt at the boundary between the external information and the original. |
