Patent ID: 8184353

Claim:
A barcode scanning device which scans an encoded information such as a barcode in an information reading area, comprising a housing having a read window; a light source for emitting a light beam, the light source being accommodated within the housing; a polygon mirror rotatably accommodated within the housing, the polygon mirror comprising a first reflective surface and more than one second reflective surfaces, the first reflective surface reflecting the light beam in an angle range of θ1 producing a first scanning light, the second reflective surfaces reflecting the light beam in an angle range larger than θ1 producing a second scanning light, the angles defined by the respective first reflective surface and second reflective surfaces with respect to a rotation axis of the polygon mirror each being different from another; and a first fixed mirror accommodated within the housing, the first fixed mirror reflecting both the first scanning light and the second scanning light to exterior of the housing through a read window to form a first scanning pattern for reading the encoded information in the information reading area, the first scanning pattern comprising more than one second scanning lines that are practically parallel with each other and a first scanning line that is practically parallel with the second scanning lines, the first scanning pattern including the first scanning line disposed between two of the second scanning lines, the first scanning line comprising a trajectory depicted by the first scanning light reflected from the first fixed mirror in the information reading area while the second scanning lines comprise trajectories depicted by the second scanning light reflected from the first fixed mirror in the information reading area.