JPH11183837A5 - - Google Patents
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- Publication number
- JPH11183837A5 JPH11183837A5 JP1997349504A JP34950497A JPH11183837A5 JP H11183837 A5 JPH11183837 A5 JP H11183837A5 JP 1997349504 A JP1997349504 A JP 1997349504A JP 34950497 A JP34950497 A JP 34950497A JP H11183837 A5 JPH11183837 A5 JP H11183837A5
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- Prior art keywords
- mirror
- scanning direction
- light beam
- scanning device
- optical
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Description
また、請求項２記載の光走査装置では、請求項１記載の光走査装置において、前記光ビームは、前記回転多面鏡の反射面に、該反射面の主走査方向に沿った面幅より広い光ビ−ムとして入射することを特徴とする。
また、請求項３記載の光走査装置では、請求項１又は請求項２記載の光走査装置において、前記第１のミラー対は、前記第１の結像光学系からの光ビームが入射し、該第１のミラー対で折り返されて所定の平面ミラーで反射し、反射した光ビームが再度該第一のミラー対に第一回目と逆方向に入射し、該第１のミラー対で折り返されて前記回転多面鏡の反射面に入射するように、配置されることを特徴とする。
In addition, an optical scanning device according to claim 2 is the optical scanning device according to claim 1, characterized in that the light beam is incident on the reflecting surface of the rotating polygon mirror as a light beam wider than the surface width of the reflecting surface in the main scanning direction.
In addition, the optical scanning device described in claim 3 is characterized in that in the optical scanning device described in claim 1 or claim 2, the first mirror pair is arranged so that a light beam from the first imaging optical system is incident, is turned back by the first mirror pair, and is reflected by a predetermined plane mirror, and the reflected light beam is again incident on the first mirror pair in the opposite direction to the first time, is turned back by the first mirror pair, and is incident on the reflective surface of the rotating polygon mirror.
上記第２の目的を達成するために、請求項４記載の光走査装置では、請求項３に記載の光走査装置において、前記平面ミラーは、前記回転多面鏡の回転軸と平行な所定の軸の回りに回転可能であり、且つ前記所定の軸と前記回転多面鏡の反射面の法線とを含む平面内で、前記所定の軸回りの回転と独立に回転可能に設けられていることを特徴とする。 In order to achieve the above-mentioned second object, the optical scanning device of claim 4 is characterized in that , in the optical scanning device of claim 3, the plane mirror is rotatable around a predetermined axis parallel to the rotation axis of the rotating polygon mirror, and is arranged to be rotatable independently of rotation around the predetermined axis within a plane containing the predetermined axis and the normal to the reflecting surface of the rotating polygon mirror.
なお、請求項２に記載したように、光ビームが回転多面鏡の反射面に該反射面の主走査方向に沿った面幅より広い光ビ−ムとして入射するよう構成されたオーバーフィルド方式では、前述したように有効走査率を上げても結像光学系の焦点距離が長くなるが、請求項１記載の発明を適用することにより、結像光学系の光路長が長くなっても実装上の光路長が長くなることを回避し、光走査装置の大型化を回避することができる。
ここで、請求項３記載の発明のように、第一の結像光学系からの光ビームが第１のミラー対に入射し、該第１のミラー対で折り返されて所定の平面ミラーで反射し、そして、反射した光ビームが再度該第１のミラー対に第１回目と逆方向に入射し、該第１のミラー対で折り返されて回転多面鏡の反射面に入射するように、第１のミラー対を配置することが好ましい。
In the overfilled method, as described in claim 2, in which the light beam is incident on the reflecting surface of the rotating polygon mirror as a light beam wider than the surface width of the reflecting surface in the main scanning direction, even if the effective scanning rate is increased, the focal length of the imaging optical system becomes longer as mentioned above.However, by applying the invention described in claim 1, it is possible to avoid the optical path length in the actual implementation becoming longer even if the optical path length of the imaging optical system becomes longer, and it is possible to avoid an increase in the size of the optical scanning device.
Here, as in the invention described in claim 3 , it is preferable to position the first mirror pair so that the light beam from the first imaging optical system enters the first mirror pair, is turned back by the first mirror pair, is reflected by a predetermined plane mirror, and the reflected light beam then enters the first mirror pair again in the opposite direction to the first time, is turned back by the first mirror pair, and is incident on the reflecting surface of the rotating polygon mirror.
よって、請求項３記載の発明によれば、回転多面鏡より前段の光学系の光路と回転多面鏡より後段の光学系の光路の両方において、実装上の光路長が短縮され、光走査装置の小型化をより一層図ることができる。 Therefore, according to the invention described in claim 3 , the optical path length in implementation is shortened in both the optical path of the optical system preceding the rotating polygon mirror and the optical path of the optical system following the rotating polygon mirror, thereby further reducing the size of the optical scanning device.
また、請求項２記載の発明によれば、結像光学系の焦点距離が長くなるオーバーフィルド方式において、結像光学系の光路長が長くなっても実装上の光路長が長くなることを回避できるので、光走査装置の大型化を回避することができる。
また、請求項３記載の発明によれば、第１の結像光学系から回転多面鏡までの光路を、折り曲げ且つ光ビームが第１のミラー対を２回通過するよう構成することで、回転多面鏡より前段の光学系の光路における実装上の光路長を、展開した状態の約半分に縮めることができるので、回転多面鏡より前段の光学系の光路と回転多面鏡より後段の光学系の光路の両方において、実装上の光路長が短縮され、部品点数を増やすことなく比較的簡素な構成で光走査装置の小型化をより一層図ることができる。
Furthermore, according to the invention described in claim 2, in an overfilled system in which the focal length of the imaging optical system is long, even if the optical path length of the imaging optical system is long, it is possible to avoid the optical path length in terms of implementation from being long, thereby avoiding an increase in the size of the optical scanning device.
Furthermore, according to the invention described in claim 3 , by bending the optical path from the first imaging optical system to the rotating polygon mirror and configuring the light beam to pass through the first mirror pair twice, the optical path length in the optical path of the optical system preceding the rotating polygon mirror can be reduced to approximately half of the length in the unfolded state.As a result, the optical path length in the optical path of both the optical system preceding the rotating polygon mirror and the optical path of the optical system following the rotating polygon mirror is reduced, and the optical scanning device can be further miniaturized with a relatively simple configuration without increasing the number of parts.
Claims (8)
所定の回転軸の回りを略等角速度で回転し且つ前記回転軸に平行な複数の反射面が外周に形成され、入射された光ビームを前記反射面により偏向させる回転多面鏡と、
光源から射出された光ビームを、前記回転軸に平行な副走査方向に収束させて前記反射面上に前記副走査方向に垂直な主走査方向に沿った線像として結像させる第１の結像光学系と、
前記副走査方向に沿った断面内で前記反射面と被走査面とを略共役な結像関係とするとともに、前記反射面により偏向された光ビームを、等速度で前記被走査面を走査するスポットとして結像させる第２の結像光学系と、
前記回転多面鏡から前記第２の結像光学系に至る光路上に配置され且つ前記副走査方向に沿った断面で９０°の相対角度を成す第１のミラー対と、
前記第２の結像光学系から前記被走査面に至る光路上に配置され且つ前記副走査方向に沿った断面で９０°の相対角度を成す第２のミラー対と、
を有する光走査装置。 A light source and
a rotating polygonal mirror that rotates around a predetermined rotation axis at a substantially constant angular velocity, has a plurality of reflecting surfaces formed on its outer periphery that are parallel to the rotation axis, and deflects an incident light beam by the reflecting surfaces;
a first imaging optical system that converges a light beam emitted from a light source in a sub-scanning direction parallel to the rotation axis and forms a line image on the reflecting surface along a main scanning direction perpendicular to the sub-scanning direction;
a second imaging optical system that establishes a substantially conjugate imaging relationship between the reflecting surface and the scanned surface in a cross section along the sub-scanning direction, and that images the light beam deflected by the reflecting surface as a spot that scans the scanned surface at a uniform speed;
a first mirror pair that is disposed on an optical path from the rotary polygon mirror to the second imaging optical system and that forms a relative angle of 90° in a cross section along the sub-scanning direction;
a second mirror pair disposed on an optical path from the second imaging optical system to the scanned surface and forming a relative angle of 90° in a cross section along the sub-scanning direction;
An optical scanning device having:
前記第１の結像光学系からの光ビームが入射し、該第１のミラー対で折り返されて所定の平面ミラーで反射し、
反射した光ビームが再度該第一のミラー対に第一回目と逆方向に入射し、該第１のミラー対で折り返されて前記回転多面鏡の反射面に入射するように、
配置されることを特徴とする請求項１又は請求項２記載の光走査装置。 The first mirror pair comprises:
a light beam from the first imaging optical system is incident, is reflected by the first mirror pair, and is reflected by a predetermined plane mirror;
the reflected light beam is incident on the first mirror pair again in the opposite direction to the first time, is reflected by the first mirror pair, and is incident on the reflecting surface of the rotating polygon mirror;
3. The optical scanning device according to claim 1, wherein the optical scanning device is arranged in a position corresponding to the optical axis .
１．５＜β＜３．５
を満足することを特徴とする請求項１乃至請求項７の何れか一項に記載の光走査装置。 The second imaging optical system is configured by a single plastic aspherical lens, and a conjugate magnification β relating to the imaging relationship between the reflecting surface and the scanned surface in a cross section along the sub-scanning direction is:
1.5<β<3.5
8. The optical scanning device according to claim 1, wherein the following is satisfied:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34950497A JP4051741B2 (en) | 1997-12-18 | 1997-12-18 | Optical scanning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34950497A JP4051741B2 (en) | 1997-12-18 | 1997-12-18 | Optical scanning device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPH11183837A JPH11183837A (en) | 1999-07-09 |
| JPH11183837A5 true JPH11183837A5 (en) | 2005-07-14 |
| JP4051741B2 JP4051741B2 (en) | 2008-02-27 |
Family
ID=18404197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34950497A Expired - Fee Related JP4051741B2 (en) | 1997-12-18 | 1997-12-18 | Optical scanning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4051741B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1701198A1 (en) | 2005-03-09 | 2006-09-13 | Canon Kabushiki Kaisha | Optical scanning apparatus and image forming apparatus using the same |
| JP5428514B2 (en) * | 2009-05-14 | 2014-02-26 | コニカミノルタ株式会社 | Scanning optical apparatus and image forming apparatus |
| JP5945894B2 (en) * | 2011-07-11 | 2016-07-05 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP6601626B2 (en) * | 2016-08-30 | 2019-11-06 | 京セラドキュメントソリューションズ株式会社 | Optical scanning device and image forming apparatus including the optical scanning device |
| CN112068297B (en) * | 2020-09-22 | 2025-04-29 | 湖南兵器光电科技有限公司 | Folding fiber laser launch device |
-
1997
- 1997-12-18 JP JP34950497A patent/JP4051741B2/en not_active Expired - Fee Related
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