JPH06313854A - Optical deflecting system - Google Patents
Optical deflecting systemInfo
- Publication number
- JPH06313854A JPH06313854A JP12355193A JP12355193A JPH06313854A JP H06313854 A JPH06313854 A JP H06313854A JP 12355193 A JP12355193 A JP 12355193A JP 12355193 A JP12355193 A JP 12355193A JP H06313854 A JPH06313854 A JP H06313854A
- Authority
- JP
- Japan
- Prior art keywords
- cover
- polygon mirror
- rotary polygon
- window
- mirror
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
- B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
Landscapes
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Dot-Matrix Printers And Others (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、レーザプリンタ等にお
いてレーザ光等を高速度で偏向走査する光偏向器に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical deflector for deflecting and scanning a laser beam or the like at a high speed in a laser printer or the like.
【０００２】[0002]
【従来の技術】レーザプリンタやレーザファクシミリ等
の光偏向器は、近年特に高速化が進み、これに用いられ
る回転多面鏡は毎分１万数千回転以上の高速回転を行
う。回転多面鏡をこのような高速度で回転させると、回
転中の風切音が増大し、大きな騒音を発生するため、回
転多面鏡の周囲は略円筒状のカバーで覆われている。2. Description of the Related Art Optical deflectors for laser printers, laser facsimiles and the like have been particularly accelerated in recent years, and rotary polygon mirrors used for these deflectors rotate at high speeds of 10,000 or more revolutions per minute. When the rotary polygon mirror is rotated at such a high speed, the wind noise during rotation is increased and a large noise is generated. Therefore, the periphery of the rotary polygon mirror is covered with a substantially cylindrical cover.
【０００３】図５は一般的な光偏向器の全体を説明する
もので、光学箱１００に取り付けられたレーザ発振器１
１０から発生されたレーザ光Ｌはシリンドリカルレンズ
１０５によって所定のビーム形状に集光されたのち、回
転多面鏡１０１によって偏向走査され、結像レンズ系１
０６を経て感光ドラム１０７上に結像する。回転多面鏡
１０１によって反射されたレーザ光の一部は反射ミラー
１０８によって光ファイバ１０９に導入され、走査開始
信号に変換される。FIG. 5 illustrates a general optical deflector as a whole. A laser oscillator 1 mounted on an optical box 100 is shown.
The laser light L generated from the laser beam 10 is condensed into a predetermined beam shape by the cylindrical lens 105, and then is deflected and scanned by the rotary polygon mirror 101 to form the imaging lens system 1.
An image is formed on the photosensitive drum 107 via 06. A part of the laser light reflected by the rotary polygon mirror 101 is introduced into the optical fiber 109 by the reflection mirror 108 and converted into a scanning start signal.
【０００４】図４は回転多面鏡１０１とその駆動部を示
すもので、回転多面鏡１０１の駆動部は、回転軸１１１
と、これに一体的に結合されたロータマグネット１１２
と、回転軸１１１を支承する軸受装置１１３と一体であ
るステータコイル１１４と、ステータコイル１１４に駆
動電流を供給する回路基板１１５を有し、回転多面鏡１
０１は、波型ワッシャ１１６ａと平型ワッシャ１１６ｂ
と止め輪１１６ｃからなる押え機構１１６によって、回
転軸１１１と一体であるフランジ部材１１１ａに押圧さ
れ、これによって回転軸１１１と一体化されている。回
転多面鏡１０１は略円筒状のカバー１０２によって覆わ
れており、これによって、回転多面鏡１０１の回転に伴
う空気の流動を制限し、風切音の発生を低減するととも
に、風切音が外部へ洩れるのを防ぐ。なお、カバー１０
２の円筒部分１０２ａにはレーザ光を通過させる窓１０
３が設けられている。FIG. 4 shows the rotary polygon mirror 101 and its drive unit. The drive unit of the rotary polygon mirror 101 is a rotary shaft 111.
And the rotor magnet 112 integrally connected to the
The rotary polygon mirror 1 includes a stator coil 114 that is integral with a bearing device 113 that supports the rotary shaft 111, and a circuit board 115 that supplies a drive current to the stator coil 114.
01 is a corrugated washer 116a and a flat washer 116b
A pressing mechanism 116 including a stopper ring 116c presses the flange member 111a, which is integrated with the rotating shaft 111, and thereby is integrated with the rotating shaft 111. The rotary polygon mirror 101 is covered with a substantially cylindrical cover 102, which limits the flow of air accompanying the rotation of the rotary polygon mirror 101, reduces wind noise, and reduces wind noise. To prevent leakage. The cover 10
The second cylindrical portion 102a has a window 10 through which laser light passes.
3 is provided.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記従来
の技術によれば、カバーの内部で回転多面鏡の高速回転
に伴って流動する空気が、カバーの窓から外へ流出する
ときに大きな風切音を発生し、騒音の一因となる。However, according to the above-mentioned prior art, when the air flowing along with the high speed rotation of the rotary polygon mirror inside the cover flows out from the window of the cover, a large wind noise is generated. And cause noise.
【０００６】本発明は、上記従来の技術の問題点に鑑み
てなされたものであり、カバーの内部で回転多面鏡の高
速回転に伴って流動する空気がカバーの窓から外へ流出
するときの風切音を低減できる光偏向器を提供すること
を目的とするものである。The present invention has been made in view of the above-mentioned problems of the prior art. When the air flowing along with the high speed rotation of the rotary polygon mirror inside the cover flows out from the window of the cover. An object of the present invention is to provide an optical deflector capable of reducing wind noise.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めに本発明の光偏向器は、外周面に照射された照明光を
偏向走査する回転多面鏡と、その外周面を覆う筒状部分
を有するカバーからなり、該カバーの筒状部分に前記照
明光を通過させる開口が設けられており、前記筒状部分
の内面と前記回転多面鏡の径方向の離間距離が、前記開
口に近づくにつれて増大していることを特徴とする。In order to achieve the above object, an optical deflector of the present invention comprises a rotary polygonal mirror for deflecting and scanning illumination light radiated to an outer peripheral surface, and a cylindrical portion covering the outer peripheral surface. An opening that allows the illumination light to pass through is provided in a tubular portion of the cover, and a radial separation distance between the inner surface of the tubular portion and the rotary polygon mirror becomes closer to the opening. It is characterized by increasing.
【０００８】カバーの筒状部分が円形断面をもち、前記
カバーの筒状部分が回転多面鏡に対して開口を遠ざける
方向に偏心しているとよい。It is preferable that the tubular portion of the cover has a circular cross section, and the tubular portion of the cover is eccentric to the rotary polygon mirror in a direction away from the opening.
【０００９】[0009]
【作用】カバー内において回転多面鏡ととも流動する空
気の流速は、回転多面鏡の外周面に近いもの程大きい。
また、開口からカバーの外へ流出する空気およびこれに
よって生じる負圧のために新たにカバー内へ流入する空
気がそれぞれ開口を通るときに発生する風切音による騒
音は、出入する空気の流速が速い程大きい。筒状部分の
内面と回転多面鏡の径方向の離間距離を開口に近づくに
つれて増大し、開口を回転多面鏡の外周面から遠ざけれ
ば、開口から流出する空気の流速は低くなるため、風切
音による騒音が軽減される。偏心カバーを利用すれば、
カバーの寸法を必要以上に大きくする必要がないために
装置の大型化を招くおそれがない。The flow velocity of the air flowing together with the rotary polygon mirror in the cover increases as it approaches the outer peripheral surface of the rotary polygon mirror.
Further, the noise caused by the wind noise generated when the air flowing out of the cover through the opening and the air newly flowing into the cover due to the negative pressure generated by the air flow through the opening respectively have a flow velocity of the air flowing in and out. The faster it is, the bigger it is. The radial separation distance between the inner surface of the tubular part and the rotary polygon mirror increases as it approaches the opening, and if the opening is moved away from the outer peripheral surface of the rotary polygon mirror, the flow velocity of the air flowing out from the opening decreases, so that the wind blow Noise due to sound is reduced. If you use the eccentric cover,
Since it is not necessary to make the size of the cover larger than necessary, there is no risk of increasing the size of the device.
【００１０】[0010]
【実施例】本発明の実施例を図面に基づいて説明する。Embodiments of the present invention will be described with reference to the drawings.
【００１１】図１は一実施例の主要部を示す部分模式断
面図であって、本実施例の回転多面鏡１は、その外周面
に反射面１ａを有し、従来例と同様の駆動部１ｂによっ
て、中心軸Ｃ1 のまわりを回転される。回転多面鏡１は
略筒状のカバー２によって覆われており、カバー２はそ
の筒状部分である円筒部分２ａに開口である窓３を有す
る。図示しない光源から窓３を通って回転多面鏡１の反
射面１ａに照射されたレーザ光は、回転多面鏡１によっ
て偏向走査され、図示しない結像レンズ系を経て感光ド
ラムに結像される。FIG. 1 is a partial schematic cross-sectional view showing a main part of one embodiment. A rotary polygon mirror 1 of this embodiment has a reflecting surface 1a on its outer peripheral surface and is similar to a conventional driving unit. It is rotated about the central axis C 1 by 1b. The rotary polygon mirror 1 is covered with a substantially cylindrical cover 2, and the cover 2 has a window 3 which is an opening in a cylindrical portion 2a which is a cylindrical portion. The laser light emitted from the light source (not shown) through the window 3 to the reflecting surface 1a of the rotary polygon mirror 1 is deflected and scanned by the rotary polygon mirror 1, and is imaged on the photosensitive drum through an image forming lens system (not shown).
【００１２】カバー２の円筒部分２ａは、回転多面鏡１
に対して、窓３が回転多面鏡１の外周面から遠ざかるよ
うにΔＲだけ偏心して配設されている。すなわち、図２
に示すように、カバー２の円筒部分２ａの中心軸Ｃ2 は
回転多面鏡１の中心軸Ｃ1 に対して窓３を遠ざける方向
にΔＲだけずれており、カバー２の円筒部分２ａの内面
と回転多面鏡１の中心軸Ｃ1 の離間距離Ｒは、窓３を有
する部分においてカバー２の円筒部分２ａの半径に前記
偏心量ΔＲを加えた最大値を示す。The cylindrical portion 2a of the cover 2 has a rotary polygon mirror 1
On the other hand, the window 3 is arranged eccentrically by ΔR so as to be away from the outer peripheral surface of the rotary polygon mirror 1. That is, FIG.
As shown in, the center axis C 2 of the cylindrical portion 2a of the cover 2 is displaced from the center axis C 1 of the rotary polygon mirror 1 by ΔR in the direction of moving the window 3 away from the inner surface of the cylindrical portion 2a of the cover 2. The separation distance R of the central axis C 1 of the rotary polygon mirror 1 indicates the maximum value obtained by adding the eccentricity ΔR to the radius of the cylindrical portion 2a of the cover 2 in the portion having the window 3.
【００１３】回転多面鏡１が高速回転すると、これに伴
ってカバー２内の空気が高速度で流動し、一部は窓３か
ら吐出される。窓３から吐出される空気は回転多面鏡１
の回転方向に旋回して窓３の周縁に負圧を発生させ、そ
の結果、新たな空気が窓３からカバー２の内部へ流入す
る。このように窓３を通って出入する空気は、窓３の外
周縁との摩擦やその周辺に発生する渦によって風切音を
発生し、該風切音は、窓３から流出する空気の流速が速
い程大きくなる。When the rotary polygon mirror 1 rotates at a high speed, the air inside the cover 2 flows at a high speed, and a part of the air is discharged from the window 3. The air discharged from the window 3 is the rotary polygon mirror 1.
To generate a negative pressure on the peripheral edge of the window 3, and as a result, new air flows into the cover 2 from the window 3. In this way, the air flowing in and out through the window 3 generates wind noise due to friction with the outer peripheral edge of the window 3 and vortices generated in the periphery thereof, and the wind noise is the flow velocity of the air flowing out from the window 3. Becomes faster the faster.
【００１４】このように、カバー２内で回転多面鏡１と
ともに流動する空気は、回転多面鏡１の外周面に近いも
の程流速が大きいため、窓３を通る空気の流速を小さく
して風切音を低減するには、カバー２の径寸法を大きく
して回転多面鏡１とカバー２の円筒部分２ａの内面の離
間距離Ｒを全体的に大きくすればよいが、カバー２の内
径寸法を大きくすることは、装置の小形化を妨げる結果
となり、好ましくない。本実施例は、カバー２の円筒部
分２ａの径方向の寸法を大きくすることなく、カバー２
の円筒部分２ａを回転多面鏡１に対して偏心させること
で、前記離間距離Ｒを窓３によって開口している部分に
おいて局部的に増大させ、これによって風切音を低減す
るものである。すなわち、窓３は回転多面鏡１の外周面
から径方向に大きく離間しており、窓３から流出する空
気は、回転多面鏡１から遠ざかる間にその流速を失って
減速したものであるため、窓３の外周縁との間で大きな
風切音を発生しない。カバー２は、回転多面鏡１を駆動
するモータ基板４に取り付けられている。As described above, the air flowing along with the rotary polygon mirror 1 in the cover 2 has a larger flow velocity as it approaches the outer peripheral surface of the rotary polygon mirror 1. Therefore, the flow velocity of the air passing through the window 3 is reduced to wind off. In order to reduce the sound, the diameter of the cover 2 may be increased to increase the distance R between the rotary polygon mirror 1 and the inner surface of the cylindrical portion 2a of the cover 2 as a whole, but the inner diameter of the cover 2 may be increased. Doing so is unfavorable because it results in hindering the miniaturization of the device. In the present embodiment, the cover 2 is provided without increasing the radial dimension of the cylindrical portion 2a of the cover 2.
By eccentricizing the cylindrical portion 2a with respect to the rotary polygon mirror 1, the separation distance R is locally increased in the portion opened by the window 3, thereby reducing wind noise. That is, the window 3 is largely separated from the outer peripheral surface of the rotary polygon mirror 1 in the radial direction, and the air flowing out from the window 3 loses its flow velocity while moving away from the rotary polygon mirror 1, and thus is decelerated. A large wind noise is not generated between the outer peripheral edge of the window 3. The cover 2 is attached to a motor substrate 4 that drives the rotary polygon mirror 1.
【００１５】なお、図３に示すように、回転多面鏡１１
とカバー１２の円筒部分１２ａが同心的に配置されてい
るときは、カバー１２の円筒部分１２ａの内面と回転多
面鏡１１間の隙間Ｗの径方向の寸法が回転多面鏡１１の
最大外径の１０％〜２５％程度であれば、風切音による
騒音を大幅に低減できることが実験によって判明してい
る。しかしながら、このためにはカバー１２の径寸法を
著しく大きくしなければならず、省スペースの点から好
ましくない。As shown in FIG. 3, the rotary polygon mirror 11
And the cylindrical portion 12a of the cover 12 are concentrically arranged, the radial dimension of the gap W between the inner surface of the cylindrical portion 12a of the cover 12 and the rotary polygon mirror 11 is equal to the maximum outer diameter of the rotary polygon mirror 11. It has been empirically proved that the noise due to the wind noise can be significantly reduced if it is about 10% to 25%. However, for this purpose, the diameter of the cover 12 must be significantly increased, which is not preferable in terms of space saving.
【００１６】本実施例によれば、大径のカバーを用いる
ことなく、カバーの円筒部分の窓を有する部分を回転多
面鏡の外周面から局部的に遠ざけることにより、風切音
による騒音を３〜４ｄＢ低減できる。According to the present embodiment, the noise due to the wind noise is reduced to 3 by locally separating the portion having the window of the cylindrical portion of the cover from the outer peripheral surface of the rotary polygon mirror without using a large-diameter cover. It can be reduced by ~ 4 dB.
【００１７】以上の実施例では、カバーはモータ基板に
取り付けられているが、カバーを光学箱内部を密閉する
蓋と一体に形成しても、同様の効果が期待できる。In the above embodiments, the cover is attached to the motor substrate, but the same effect can be expected if the cover is formed integrally with the lid that seals the inside of the optical box.
【００１８】[0018]
【発明の効果】本発明は、上述のように構成されている
ので、以下に記載するような効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００１９】回転多面鏡のカバーの窓から出入する空気
による風切音を低減し、騒音の少ない光偏向器を実現す
る。A wind deflector due to air flowing in and out through the window of the cover of the rotary polygon mirror is reduced to realize an optical deflector with less noise.
【図１】一実施例の主要部を示す部分模式断面図であ
る。FIG. 1 is a partial schematic cross-sectional view showing a main part of one embodiment.
【図２】図１のＡ−Ａ線に沿ってとった模式断面図であ
る。FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.
【図３】回転多面鏡とカバーが同心的に配置されている
場合を示す模式断面図である。FIG. 3 is a schematic cross-sectional view showing a case where a rotary polygon mirror and a cover are concentrically arranged.
【図４】従来例の主要部を示す部分模式断面図である。FIG. 4 is a partial schematic cross-sectional view showing a main part of a conventional example.
【図５】一般的な光偏向器を説明する説明図である。FIG. 5 is an explanatory diagram illustrating a general optical deflector.
１ 回転多面鏡 １ａ 反射面 ２ カバー ２ａ 円筒部分 ３ 窓 1 rotating polygon mirror 1a reflecting surface 2 cover 2a cylindrical portion 3 window
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮本 英幸 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 冨田 健一 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 鈴木 康夫 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideyuki Miyamoto 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kenichi Tomita 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Yasuo Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.
Claims (2)
る回転多面鏡と、その外周面を覆う筒状部分を有するカ
バーからなり、該カバーの筒状部分に前記照明光を通過
させる開口が設けられており、前記筒状部分の内面と前
記回転多面鏡の径方向の離間距離が、前記開口に近づく
につれて増大していることを特徴とする光偏向器。1. A rotary polygon mirror that deflects and scans the illumination light applied to the outer peripheral surface, and a cover having a tubular portion that covers the outer peripheral surface. An opening for passing the illumination light through the tubular portion of the cover. Is provided, and the distance between the inner surface of the cylindrical portion and the rotary polygon mirror in the radial direction increases as the distance from the opening increases.
記カバーの筒状部分が回転多面鏡に対して開口を遠ざけ
る方向に偏心していることを特徴とする請求項１記載の
光偏向器。2. The optical deflector according to claim 1, wherein the tubular portion of the cover has a circular cross section, and the tubular portion of the cover is eccentric to the rotary polygon mirror in a direction away from the opening. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12355193A JPH06313854A (en) | 1993-04-27 | 1993-04-27 | Optical deflecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12355193A JPH06313854A (en) | 1993-04-27 | 1993-04-27 | Optical deflecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06313854A true JPH06313854A (en) | 1994-11-08 |
Family
ID=14863406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12355193A Pending JPH06313854A (en) | 1993-04-27 | 1993-04-27 | Optical deflecting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06313854A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020086213A (en) * | 2018-11-28 | 2020-06-04 | 京セラドキュメントソリューションズ株式会社 | Optical deflector, optical scanner including optical deflector, and image forming apparatus including optical scanner |
-
1993
- 1993-04-27 JP JP12355193A patent/JPH06313854A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020086213A (en) * | 2018-11-28 | 2020-06-04 | 京セラドキュメントソリューションズ株式会社 | Optical deflector, optical scanner including optical deflector, and image forming apparatus including optical scanner |
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