Abstract: A transparent adapter hinged to a flatbed scanner for the scanning of a transparency or negative, including a hot cathode-ray tube to provide light, a refractor mounted around the hot cathode-ray tube to refract light from the hot cathode-ray tube onto a document, for permitting the image of the document to be picked up by a charge-coupled device in the optical scanner, and to prevent light from being directly projected by the hot cathode-ray tube onto the document.

Abstract: An optical system for a flatbed scanner, including a first optical unit to emit light onto a document and to reflect the image of the document, a second optical unit to receive reflected light from the first optical unit and to reflect it, a third optical unit to receive reflected light from the second optical unit and to send it out, and a fourth optical unit to receive light from the third optical unit and to pick up the image from it, wherein the first optical unit, the second optical unit and the third optical unit can be independently moved relative to the fourth optical unit subject to a predetermined setting made in the optical scanner.