公开(公告)号：US20190064693A1

公开(公告)日：2019-02-28

申请号：US15981422

申请日：2018-05-16

Applicant: S-PRINTING SOLUTION CO., LTD.

Inventor： Wan Chin KIM ,  Wan Ho LEE ,  Kyoung Man KIM ,  Su Hwan KIM ,  Yong Shik PARK ,  Sang Koo HAN

IPC: G03G15/04

Abstract: An image forming device comprises: an exposer having a plurality of light emitting devices, a light emitting device among the plurality of light emitting devices to transmit light toward a photosensitive drum; and a developer to develop an electrostatic latent image formed on a surface of the photosensitive drum by the light, wherein the light emitting device among the plurality of light emitting devices includes: a light emitting layer to generate the light; and a reflective layer to reflect at least a portion of the generated light. The reflective layer can include a plurality of sub-reflective layers, in which a thickness of a sub-reflective layer among the plurality of sub-reflective layers is different from a thickness of another sub-reflective layer among the plurality of sub-reflective layers, and/or a refractive index of a sub-reflective layer among the plurality of sub-reflective layers is different from a refractive index of another sub-reflective layer among the plurality of sub-reflective layers.