Patent ID: 7006197
Filing Date: 2006-02-28
Classification: G02B,G03F

Abstract:
1. An optical projection system irradiating an projection light on a predetermined area of a work, the projection light is obtained by passing an illumination light from a light source through a mask, the optical projection system comprising: a reflector provided with a first reflection surface and a second reflection surface which reflect the projection light and change a traveling direction of the projection light; an entrance lens through which the projection light is passed and guides the projection light to the first reflection surface; a reflective optics which reflects the projection light reflected by the first reflection surface and guides the projection light to the second reflection surface; an exit lens through which the projection light reflected by the second reflection surface is passed and guides the projection light to the work; and a position adjustor which supports coaxially the entrance lens and the exit lens so that the entrance lens is spaced a predetermined distance from the exit lens, and the reflector is positioned between the entrance lens and the exit lens, and the position adjustor slides the entrance lens and the exit lens in a direction along a light axis of the entrance lens and exit lens, wherein the reflective optics includes a concavo-reflection mirror which reflects the projection light reflected by the first reflection surface ( the optical compensation system, through which the projection light is passed, is positioned between the concavo-reflection mirror and the reflector, and corrects the chromatic aberrations of the projection light.