Apparatus for deflecting light and scanning line conversion system

Abstract

A method and apparatus for deflecting a light beam having high resolution, good linearity with time and high frequency response. For deflecting a light beam, after a monochromatic light beam is applied to a light deflection unit driven by a sinusoidal AC voltage so as to carry out light deflection, the deflected monochromatic light beam is scanned on a deflection angle correction plate which comprises elemental holograms formed by a multiple-beam hologram production technique. Thereafter, the light beam passing through the deflection angle correction plate is focused on a light receiving surface to perform a uniform scanning thereon. An embodiment includes a scanning conversion system for converting a circular scanning line into a linear scanning line comprising a monochromatic light source, a light deflection member for circular-scanning a monochromatic light beam from the monochromatic light source, a deflection angle correction member for forming a deflection light beam through the circular-scanned light beam with this correction member comprising an arrangement of elemental holograms formed by a two-beam hologram production technique and a light receiving member for the diffracted light beam, in which the diffracted light beam from the deflection angle correction member is applied to the light receiving member to carry out uniform linear scanning.