| 摘要 |
The image reading device has a light source, a collimator lens, a cylindrical lens and a line sensor. The light source is provided with light-emitting diodes radiating green, red and blue light beams, respectively. The light-emitting diodes are arranged on a straight line, which is perpendicular to the optical axis of the collimator lens and which intersects a focal point of the collimator lens. Each of the green, red and blue light beams is changed to a parallel beam by the collimator lens, and is then changed to a strip-shaped light beam by the cylindrical lens. The parallel beam passes through a film, and is radiated onto a line sensor. Out-of-register of the red, green and blue components generated on the line sensor are corrected by a calculation applied to pixel signals obtained by the line sensor.
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