Patent ID: 6201561
Filing Date: 2001-03-13
Classification: B41J,G02B

Abstract:
An optical scanner having a deflection part that deflects, in a fast scan direction, a light beam incident to incline its optical axis by a predetermined angle in a slow scan direction, which intersects said fast scan direction; and a scanning optical system provided on a deflection side of said deflection part, for focusing, on a surface to be scanned, the light beam incident to scan an optical spot, wherein said scanning optical system being constructed of a scanning lens, which refracts, on a first refractive surface on the side of said deflection part, to reduce a change in an incident angle of the incident light beam in the slow scan direction, said change occurs in response to a deflection angle of said deflection part within a fast scan range in the fast scan direction, and which emits, on a second refractive surface on the side of said surface to be scanned, such that the light beam after emission substantially coincide in the slow-scan direction.