Video clock signal generator in an optical scanner in which a mask including a linear scale provides timing for controlling the amplitude of a vibrating mirror

An optical scanning image input device comprising:

• a linear scale having a plurality of gratings arranged at a predetermined pitch;
• beam supply means for supplying a first beam having a first optical characteristic for forming a first light spot on the linear scale and a second beam having a second optical characteristic for forming a second light spot on the linear scale;
• a center of the first light spot and a center of the second light spot being spaced from each other by a predetermined distance in a direction of array of the gratings;
• a scanner for scanning the first light spot and the second light spot on the linear scale in the direction of array of the gratings;
• processing means for generating the video clock signal in accordance with optical information on the first beam from the linear scale and optical information on the second beam from the linear scale;
• means for generating an image signal synchronized with the vibration scanner mirror;
• and
• means for forming an image from the image signal and the video clock signal.