Patent ID: 8654421
Filing Date: 2014-02-18
Classification: G02B

Abstract:
1. An exposure device comprising: a light-emitting element array in which a plurality of light-emitting elements is arranged on a line extending in a predetermined direction; and a hologram element array in which a plurality of hologram elements is multiplex-recorded, each of the plurality of hologram elements corresponding to each of the plurality of light-emitting elements, respectively, at a recording layer that is disposed above the light-emitting element array, wherein each of the plurality of hologram elements diffracts and converges lights that exit due to illumination of lights from each of the plurality of light-emitting elements, respectively, to form a plurality of collected-light points on a surface to be exposed, the plurality of collected-light points is aligned in another substantially straight line extending in the predetermined direction, and intersection points between optical axes of reference lights and optical axes of signal lights that record the plurality of hologram elements respectively are not aligned in the predetermined direction.