| 摘要 |
A color printer with a single photo sensor for detecting the position of the ink ribbon. A single photo sensor is place so that it can detect transparent and opaque sections of the ink ribbon. The ribbon winds at a constant speed, so the pattern of transparent and opaque sections periodically repeats. The controller can use the periodicity of the transparent and opaque sections to calculate which dye frame the print head is positioned over. Using this information, the printer can advance the ink ribbon to the desired dye frame for printing onto the photo paper.
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