Combination of circular/straight line light beam scan transforming apparatus and optical device and method of fabricating circular/straight line transforming device

摘要

A combination of a circular/straight line light beam scan transforming apparatus and optical device constitutes an optical system. In the optical device, a light beam whose intensity is varied by a modulation signal is produced, and an object is exposed to the scanning beam from the light beam scan apparatus. The light beam scan apparatus includes a circular/straight line transforming optical fiber assemblage having a cylindrical portion and a linear portion. The cylindrical portion has a fore end part bent toward the center thereof so that the extension of the bent part intersects the axis of rotation of a rotary mirror rotatable at high speeds. The light beam produced in the optical device is directed to the rotary mirror and reflected thereby, focussed on the fore end part, transmitted through the optical fiber assemblage and emitted from the linear portion as a linear scanning beam in a sequence in conformity to the sequence of reception of light beam by the cylindrical portion. The object in the optical device is scanned with this linear scanning beam.