| 摘要 |
PROBLEM TO BE SOLVED: To separately detect two lines of luminous flux to a scanning area in a 2-beam scanner. SOLUTION: In the 2-beam scanner, luminous fluxes from two independent semiconductor lasers are turned into circularly polarized light having reverse directions to each other with a common 1/4 wavelength plate, and deflected by reflecting on the deflection and reflection face of a common optical deflector, the respective deflected luminous fluxes are converged as two light spots on a face to be scanned with a scanning and image-forming optical system, and two scanning lines are simultaneously scanned. The 2-beam detecting method is characterized in that two luminous fluxes directed to the scanning area are separated and detected, two luminous fluxes directed to the scanning area are made incident on a polarized light beam splitter via a common 1/4 wavelength plate, the respective luminous fluxes are spatially separated from each other and the respective separated luminous fluxes are made incident on light receiving elements corresponding to each of them and detected. COPYRIGHT: (C)2006,JPO&NCIPI
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