OPTICAL SCANNER

• Main Author: KUSUDA SHINYA
• Format: Patent
• Language: English; Japanese
• Published: 08.11.2018
• Subjects: CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

PROBLEM TO BE SOLVED: To suppress vibration due to the rotation of a polygon mirror.SOLUTION: In the optical scanner, a deflector 50 includes a bottom plate 51, a rotor 52 whose axis SX of rotation is orthogonal to the bottom plate 51, and a polygon mirror 55 fixed to the rotor 52, with a plurality of reflection surfaces R of the polygon mirror 55 arranged by being inclined a prescribed angle α to the axis of rotation. A plurality of seating faces 11F, 12F are provided at the tips of a plurality of protrusions 11, 12 projecting from above the bottom face S of a frame 100, respectively, and are in contact with the bottom plate 51. The bottom face S is such that a distance H1 from a plane PL passing through the optical axis of fθ lens 60 in each subscanning cross section of a first area S1 where at least one first protrusion 11 out of the plurality of protrusions 11, 12 is arranged, is different from a distance H2 from plane PL of a second area S2 where a second protrusion 12 other than the first protrusion 11 is arranged.SELECTED DRAWING: Figure 6 【課題】ポリゴンミラーの回転に伴う振動を抑制する【解決手段】光走査装置において、偏向器５０は、底板５１と、回転軸ＳＸが底板５１に直交する回転子５２と、回転子５２に固定されたポリゴンミラー５５とを有し、ポリゴンミラー５５の複数の反射面Ｒが回転軸に対し所定角度αで傾いて配置される。フレーム１００の底面Ｓ上から突出した複数の突出部１１，１２の先端部にそれぞれ複数の座面１１Ｆ，１２Ｆが設けられ、底板５１に接触する。底面Ｓは、複数の突出部１１，１２のうちの少なくとも一つの第１突出部１１が配置された第１領域Ｓ１のｆθレンズ６０の各副走査断面における光軸を通る平面ＰＬからの距離Ｈ１が、第１突出部１１以外の第２突出部１２が配置された第２領域Ｓ２の平面ＰＬからの距離Ｈ２と異なっている。【選択図】図６