Scanning unit suitable for applications with a high-speed scanning requirement

A scanning unit adapted to be disposed under a scanning surface, comprising:

• a lamp-mounting body adapted to be disposed under the scanning surface, and having a top surface adapted to face the scanning surface and formed with a pair of parallel first and second grooves that extend in a longitudinal direction of said lamp-mounting body, said top surface being further formed with an elongate opening disposed between said first and second grooves and extending in the longitudinal direction, each of said first and second grooves being defined by a wall of said lamp-mounting body that has a curved groove-defining surface, each of said curved groove-defining surfaces having a middle line extending in the longitudinal direction, and opposite lateral edges;
• first and second reflective layers attached respectively over said curved groove-defining surfaces of said walls of said lamp-mounting body;
• and
• tubular first and second lamps extending in the longitudinal direction and mounted respectively in said first and second grooves in said lamp-mounting body, said first and second lamps having first and second central axes, respectively;
• both said middle line of each of said curved groove-defining surfaces and a corresponding one of said first and second axes being disposed in a plane, each said curved groove-defining surface being symmetrical about a corresponding one of said planes, an intersecting line of said planes being adapted to be located on the scanning surface and being disposed directly above said opening in said lamp-mounting body.