Patent ID: 7869101
Filing Date: 2011-01-11
Classification: B41J,G03G,H04N

Abstract:
1. An optical scanning unit of an image forming apparatus, the optical scanning unit comprising: an optical housing configured to include at least one optical part and to have a light-beam emitting aperture through which a light beam can emanate from the optical housing; a shutter configured to cover the light-beam emitting aperture; and a driving unit configured to drive the shutter to open and close the light-beam emitting aperture, the driving unit being operable to coordinate at least one of the opening and the closing of the light-beam emitting aperture to occur after activation and before deactivation of a writing operation conducted by the optical scanning unit, respectively, and the shutter from a closed-condition being opened by a first trigger signal including at least one of a light-beam ON signal of the optical scanning unit and a polygon-motor ON signal of the optical scanning unit.