专利名称：DIFFRACTIVE LENS AND SCANNING LENS
FORMED WITH DIFFRACTIVE LENS
发明人：Shuichi TAKEUCHI,Yutaka TAKAKUBO申请号：US11427521申请日：20060629
公开号：US20070002446A1公开日：20070104
专利附图：
摘要：A scanning lens for an imaging optical system converges a beam emitted by alight source and deflected by a deflector on a target surface to form a beam spotscanning in a main scanning direction thereon. The scanning lens includes a plastic lens
formed by injection molding, which has a diffractive lens structure on at least one surfacethereof. The diffractive Wens structure has a plurality of annular zones arrangedconcentrically about a rotational axis. Each annular zone has a diffracting surface thatdiffracts the light beam passing therethrough. The diffractive lens structure has steppedsurfaces each connecting adjoining diffracting surfaces In a plane including the rotationalaxis and parallel with the main scanning direction, the stepped surfaces are inclined withrespect to the rotational axis so that stress working between a metallic molding for theplastic lens and each of the stepped surfaces in demolding is reduced.
申请人：Shuichi TAKEUCHI,Yutaka TAKAKUBO
地址：Tokyo JP,Tokyo JP
国籍：JP,JP
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