JP2001235696A5 - - Google Patents

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JP2001235696A5
JP2001235696A5 JP2000378264A JP2000378264A JP2001235696A5 JP 2001235696 A5 JP2001235696 A5 JP 2001235696A5 JP 2000378264 A JP2000378264 A JP 2000378264A JP 2000378264 A JP2000378264 A JP 2000378264A JP 2001235696 A5 JP2001235696 A5 JP 2001235696A5
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scanning
light emitting
optical system
sub
point
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JP2000378264A
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JP2001235696A (en
JP4090685B2 (en
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Publication of JP2001235696A5 publication Critical patent/JP2001235696A5/ja
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Claims (7)

直線上に複数個の発光点を配列してなる半導体レーザアレイとこの半導体レーザアレイから射出される複数本の光ビームをカップリングする１つのコリメートレンズとを対として複数対配設させたマルチビーム光源装置を用いるマルチビーム走査装置において、
前記半導体レーザアレイの個数をｎ（ｎ≧２）、発光点の副走査方向ピッチをｄｓ、走査線間隔をＰとしたとき、前記発光点から被走査面上の結像点に至る走査光学系全系の副走査方向の幾何学的な横倍率βが
β＝Ｐ・ｎ・ｋ／ｄｓ （ここで、ｋは正の整数）
なる式を満たすことを特徴とするマルチビーム走査装置。A multi-beam in which a plurality of pairs of a semiconductor laser array in which a plurality of light emitting points are arranged on a straight line and a single collimator lens for coupling a plurality of light beams emitted from the semiconductor laser array are arranged as a pair In a multi-beam scanning device using a light source device,
A scanning optical system from the light emitting point to the imaging point on the surface to be scanned, where n is the number of the semiconductor laser arrays (n ≧ 2), the pitch of the light emitting points is ds, and the scanning line interval is P The geometric lateral magnification β in the sub-scanning direction of the entire system is β = P · n · k / ds (where k is a positive integer)
A multi-beam scanning device characterized by satisfying the following formula: 直線上に複数個の発光点を配列してなる半導体レーザアレイとこの半導体レーザアレイから射出される複数本の光ビームをカップリングする１つのコリメートレンズとを対として複数対配設させたマルチビーム光源装置を用いるマルチビーム走査装置において、A multi-beam in which a plurality of pairs of a semiconductor laser array in which a plurality of light emitting points are arranged on a straight line and a single collimator lens for coupling a plurality of light beams emitted from the semiconductor laser array are arranged as a pair In a multi-beam scanning device using a light source device,
前記半導体レーザアレイの個数をｎ（ｎ≧４）、発光点の副走査方向ピッチをｄｓ、走査線間隔をＰとしたとき、前記発光点から被走査面上の結像点に至る走査光学系全系の副走査方向の幾何学的な横倍率βがA scanning optical system from the light emitting point to the imaging point on the scanning surface, where n is the number of the semiconductor laser arrays (n ≧ 4), ds is the pitch in the sub-scanning direction of the light emitting points, and P is the scanning line interval. The geometric lateral magnification β in the sub-scanning direction of the entire system is
β＝Ｐ・ｎ・ｋ／ｄｓ （ここで、ｋは正の整数）β = P · n · k / ds (where k is a positive integer)
なる式を満たすことを特徴とするマルチビーム走査装置。A multi-beam scanning device characterized by satisfying the following formula: 前記走査線間隔Ｐと前記発光点の副走査方向ピッチｄｓとが、ｄｓ≧Ｐなる関係を満たすことを特徴とする請求項１又は２記載のマルチビーム走査装置。 3. The multi-beam scanning device according to claim 1, wherein the scanning line interval P and the sub-scanning direction pitch ds of the light emitting points satisfy a relationship of ds ≧ P. 前記正の整数ｋが、ｋ≧２であることを特徴とする請求項１，２又は３記載のマルチビーム走査装置。The multi-beam scanning device according to claim 1 , wherein the positive integer k is k ≧ 2. 前記正の整数ｋが、ｋ＝１であることを特徴とする請求項１，２又は３記載のマルチビーム走査装置。The multi-beam scanning device according to claim 1 , wherein the positive integer k is k = 1. 前記走査光学系は、前記発光点からポリゴンミラーの偏向点に至るまでの第１の走査光学系と前記偏向点から前記結像点に至るまでの第２の走査光学系とからなり、前記偏向点から前記結像点までの光路長をＬｍ、前記第１の走査光学系全系における副走査倍率をβ１、前記第２の走査光学系全系における主走査倍率をβｍとしたとき、前記第１の走査光学系には、前記ポリゴンミラー近傍に配設され、副走査において前記ポリゴンミラー上に光ビームを集束する光学素子を有し、この光学素子の副走査方向焦点距離ｆｙが、
Ｌｍ／ｆｙ−βｍ／β１≦１
なる関係を満たすことを特徴とする請求項１又は２記載のマルチビーム走査装置。The scanning optical system includes a first scanning optical system from the light emitting point to the deflection point of the polygon mirror and a second scanning optical system from the deflection point to the imaging point. When the optical path length from the point to the imaging point is Lm, the sub-scan magnification in the entire first scanning optical system is β1, and the main scanning magnification in the entire second scanning optical system is βm, the first The scanning optical system 1 includes an optical element that is disposed in the vicinity of the polygon mirror and focuses the light beam on the polygon mirror in the sub-scanning. A focal length fy in the sub-scanning direction of the optical element is
Lm / fy-βm / β1 ≦ 1
Multi-beam scanning apparatus according to claim 1 or 2, wherein satisfies the following relationship. 電子写真方式により静電潜像が形成される像担持体表面を被走査面として光書込みを行なう請求項１ないし６の何れか一記載のマルチビーム走査装置を備えることを特徴とする画像形成装置。Claims 1 performs optical writing surface of the image bearing member on which an electrostatic latent image is formed as a surface to be scanned by the electrophotographic image forming apparatus comprising: a multi-beam scanning apparatus as claimed in 6 .
JP2000378264A 1999-12-17 2000-12-13 Multi-beam scanning apparatus and image forming apparatus Expired - Fee Related JP4090685B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000378264A JP4090685B2 (en) 1999-12-17 2000-12-13 Multi-beam scanning apparatus and image forming apparatus

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP11-358270 1999-12-17
JP35827099 1999-12-17
JP2000378264A JP4090685B2 (en) 1999-12-17 2000-12-13 Multi-beam scanning apparatus and image forming apparatus

Publications (3)

Publication Number Publication Date
JP2001235696A JP2001235696A (en) 2001-08-31
JP2001235696A5 true JP2001235696A5 (en) 2005-06-23
JP4090685B2 JP4090685B2 (en) 2008-05-28

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JP2000378264A Expired - Fee Related JP4090685B2 (en) 1999-12-17 2000-12-13 Multi-beam scanning apparatus and image forming apparatus

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4121285B2 (en) * 2002-02-18 2008-07-23 株式会社リコー Light source module, light source device, optical scanning device, and image forming apparatus
US7333254B2 (en) 2002-03-15 2008-02-19 Ricoh Company, Ltd. Optical scanning apparatus, illuminant apparatus and image forming apparatus
JP4728584B2 (en) * 2004-03-08 2011-07-20 株式会社リコー Optical scanning apparatus, image forming apparatus, and color image forming apparatus

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