Patent ID: 6840453

Claim:
An optical scanning apparatus, comprising: at least one light source for emitting a light beam; a scanner for scanning the light beam emitted from the light source; at least one mirror for reflecting the light beam scanned by the scanner; a first window for emitting a scanning beam reflected by said at least one mirror as a first scanning pattern, said first window being elongated and having a longitudinal axis; and a second window installed vertically relative to said first window, wherein said first scanning pattern emitted from the first window includes a first pattern which is emitted substantially perpendicular to said first window and a second pattern which is emitted in the direction of the second window, wherein the scanning beam reflected by said at least one mirror is emitted from the second window as a second scanning pattern different from the first scanning pattern, and wherein said second scanning pattern emitted from said second window includes a first pattern which is emitted substantially parallel to said first window, and a second pattern which is emitted from an upper portion to a lower portion of the apparatus, at an angle to said first window.