gr8npwrfl kindly explained the difference to me and I would like to include his message here, so that other people can benefit too. [I edited the spelling mistakes.]
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Originally Posted by gr8npwrfl
I can answer that for you.
Ricoh is a digital imaging company. All their technology is based on photographic sensors.
Basically there is a high resolution camera in the Ricoh that takes an image of the entire document and the digitizes it to a format you see. The fast scan is a single image being taken and the conversion time is converting it to a format you can use.
That is part of why the image area of a copy machine like the Ricoh is so thick. There has to be room for the lens and image sensor to see the entire document.
A flat bed scanner has a special image sensor that is one to three pixels wide and the length of the light source. It moves the sensor, takes an image of the entire width of the page, processes it, then moves the head to the next location, photographs it, and then processes it.
In order for a flat bed scanner to move, stabilize, photo, and process, it takes longer mechanically to operate.
In the single image process, once the mechanical, lighting, and photo exposure process is done, there is only processing time left.
Down to one sentence, the Ricoh photographs once and processes, where the flatbed photo, processes, and moves on a 1,000 times.
Hope this helps you.
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