| 摘要 |
A device adapted to recognize a color dye frame from a color ribbon (for use in a thermal printer) comprises a LED (light emitting diode) capable of producing white light, positioned so that the ribbon passes between the LED and a photo-transistor. The photo-transistor collects the light emitted by the LED as it passes through the color dye frame and generate a specific exit voltage associated with the color of the dye frame. An analog to digital converter transforms the voltage into a digital signal which is fed into a micro-computer. The micro-computer processes the digital signal by comparing the digital signal to a stored set of values associated with each color dye frame. |
