公开(公告)号：US06639698B2

公开(公告)日：2003-10-28

申请号：US09957033

申请日：2001-09-21

申请人： Hwan-young Choi ,  Moon-gyu Lee ,  Sung-min Cho ,  Jae-Youn Eum ,  Jin-seung Choi ,  Young-il Kim ,  Jee-hong Min

发明人： Hwan-young Choi ,  Moon-gyu Lee ,  Sung-min Cho ,  Jae-Youn Eum ,  Jin-seung Choi ,  Young-il Kim ,  Jee-hong Min

IPC分类号： G02B532

CPC分类号： G02B26/106

摘要： An optical scanning unit with a rotatable hologram disc, including a light source, a rotatable hologram disc provided with a plurality of holograms, the holograms being formed concentrically along a radial direction to diffract a beam emitted from the light source by multiple steps, a reflecting member that reflects the beam emitted from the light source and diffracted by one of the holograms into another hologram, and a fixed hologram correcting the diffracted beam incident through the rotatable hologram disc to focus it on a scanning object. In the optical scanning unit, the light passes through the plurality of holograms formed along a radial direction of the rotatable hologram disc so that a scan width can be extended without reducing a scan speed of the optical scanning unit.