Optical: systems and elements – Deflection using a moving element
Patent
1997-09-26
1999-03-23
Ben, Loha
Optical: systems and elements
Deflection using a moving element
359216, 250236, G02B 2608
Patent
active
058868054
ABSTRACT:
An optical scanning device and synchronizing signal detecting method, in which beams before or after an effective scanning width are identically reflected in an opposite direction of a scanning path upon being incident to a reflection unit to return to a light source unit via a focal unit and a deflection unit and signal change is induced within the light source unit upon the return of the beams, thereby detecting a synchronizing signal according to the signal change to simplifying the construction. The optical device includes the light source unit having a laser diode for radiating the beams and a photodiode for detecting the beams output, the deflection unit for deflecting the beams outgoing from the light source unit by a regular angle of view, and the focal unit for converging the beams outgoing from the deflection unit and scanning them onto a photosensitive drum. Also, a detection unit reflects the beams before or after an effective scanning width among the beams scanning the photosensitive drum in the direction opposite to the scanning path to supply them to the light source unit, and a synchronizing signal generating part detects a synchronizing signal when the photodiode induces the signal change by the beams reflected to the light source unit.
REFERENCES:
patent: 4950888 (1990-08-01), Hamada
patent: 5532866 (1996-07-01), Shibata et al.
patent: 5694236 (1997-12-01), Sekikawa
Ben Loha
Samsung Electro-Mechanics Co. Ltd.
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