Abstract: A spatial light modulating method performs spatial light modulation of light produced by a light source. The method includes forming an image of a two-dimensional pattern of the light, which has been obtained from the spatial light modulation, on a photosensitive material, using an image-sided telecentric optical system. The method further includes altering an axial air separation, upstream of the photosensitive material, to thereby adjust a focusing point at the time of the formation of the image of the two-dimensional pattern of the light.

Abstract: A light beam modulated with image information has its optical axis moved in a given direction by a light beam moving unit, and reflected successively by a plurality of rotating reflecting mirrors of a spinner to a photosensitive medium. The movement of the light beam which is caused by the light beam moving unit is controlled depending on the speed at which the reflecting mirrors move and the direction in which the reflecting mirrors move, so that the light beam reflected by each of the reflecting mirrors can scan the photosensitive medium. An image represented by the image information can efficiently be recorded on the photosensitive medium.