JPH08254665A - Deflection scanning device - Google Patents
Deflection scanning deviceInfo
- Publication number
- JPH08254665A JPH08254665A JP7083213A JP8321395A JPH08254665A JP H08254665 A JPH08254665 A JP H08254665A JP 7083213 A JP7083213 A JP 7083213A JP 8321395 A JP8321395 A JP 8321395A JP H08254665 A JPH08254665 A JP H08254665A
- Authority
- JP
- Japan
- Prior art keywords
- polygon mirror
- rotary polygon
- cover member
- scanning device
- optical box
- 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.)
- Granted
Links
Landscapes
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレーザプリンタやレーザ
ファクシミリ等の画像形成装置に用いられる偏向走査装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection scanning device used in an image forming apparatus such as a laser printer or a laser facsimile.
【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
の画像形成装置に用いられる偏向走査装置は、図５およ
び図６に示すように、光源ユニット１０１から発生され
たレーザ光をシリンドリカルレンズ１０２によって線状
の光束に集光し、回転多面鏡１０３によってその回転軸
に沿った方向（以下、「Ｚ軸方向」という。）に垂直な
所定の方向（以下、「Ｙ軸方向」という。）に偏向走査
し、球面レンズ１０４ａとトーリックレンズ１０４ｂか
らなる結像レンズ系１０４を経て回転ドラム１０５上の
感光体に結像させる。感光体に結像する光束は、回転多
面鏡１０３の回転によるＹ軸方向の主走査と、回転ドラ
ム１０５の回転によるＺ軸方向の副走査によって静電潜
像を形成する。2. Description of the Related Art As shown in FIGS. 5 and 6, a deflection scanning apparatus used in an image forming apparatus such as a laser printer or a laser facsimile linearly converts a laser beam generated from a light source unit 101 into a linear lens 102. The light is condensed into a light beam and is deflected and scanned by the rotary polygon mirror 103 in a predetermined direction (hereinafter, referred to as “Y-axis direction”) perpendicular to a direction along the rotation axis (hereinafter, referred to as “Z-axis direction”). An image is formed on the photoconductor on the rotary drum 105 via an image forming lens system 104 including a spherical lens 104a and a toric lens 104b. The light flux imaged on the photoconductor forms an electrostatic latent image by main scanning in the Y-axis direction by rotation of the rotating polygon mirror 103 and sub-scanning in the Z-axis direction by rotation of the rotating drum 105.
【０００３】回転多面鏡１０３の走査光Ｌ0 は、その走
査面（ＸＹ平面）のＹ軸方向の一端においてＢＤミラー
１０６ａによって前記走査面の下方へ分離され、ＢＤセ
ンサ１０６ｂに導入され、走査開始信号に変換されて光
源ユニット１０１の半導体レーザに送信される。半導体
レーザは走査開始信号を受信したうえで書き込み変調を
開始する。The scanning light L 0 of the rotary polygon mirror 103 is separated below the scanning surface by the BD mirror 106a at one end of the scanning surface (XY plane) in the Y-axis direction and is introduced into the BD sensor 106b to start scanning. It is converted into a signal and transmitted to the semiconductor laser of the light source unit 101. The semiconductor laser receives the scan start signal and then starts the write modulation.
【０００４】光源ユニット１０１、シリンドリカルレン
ズ１０２、回転多面鏡１０３、結像レンズ系１０４、Ｂ
Ｄミラー１０６ａおよびＢＤセンサ１０６ｂは光学箱１
０７の側壁や底壁に取り付けられる。回転ドラム１０５
は光学箱１０７の外側に配設されており、光学箱１０７
の側壁には、走査光Ｌ0 を光学箱１０７から回転ドラム
１０５に向かって取り出すための窓１０８が設けられて
いる。また、光学箱１０７の上部開口は図６のみに示す
ふた１０９によって閉塞される。A light source unit 101, a cylindrical lens 102, a rotary polygon mirror 103, an imaging lens system 104, B
The D mirror 106a and the BD sensor 106b are the optical box 1
It is attached to the side wall and bottom wall of 07. Rotating drum 105
Is disposed outside the optical box 107, and the optical box 107
A window 108 for taking out the scanning light L 0 from the optical box 107 toward the rotary drum 105 is provided on the side wall of the. Further, the upper opening of the optical box 107 is closed by a lid 109 shown only in FIG.
【０００５】光学箱１０７およびふた１０９はそれぞ
れ、隔壁１０７ａ（図５参照）や球面レンズ１０４ａに
向かって突出する突出部１０９ａ（図６参照）を有し、
これらによって光学箱１０７の内部空間を回転多面鏡１
０３およびそのモータ１０３ａのまわりの空間部１１０
ａと窓１０８に面した空間部１１０ｂに分割し、回転多
面鏡１０３の回転に伴って発生する吸引力のために窓１
０８から多量の外気が光学箱１０７内に流入するのを防
ぐように工夫されている。The optical box 107 and the lid 109 each have a partition wall 107a (see FIG. 5) and a projecting portion 109a (see FIG. 6) projecting toward the spherical lens 104a.
With these, the inner space of the optical box 107 is rotated by the polygon mirror 1.
03 and the space 110 around the motor 103a
a and a space 110b facing the window 108, and the window 1 is divided by the suction force generated by the rotation of the rotary polygon mirror 103.
It is devised to prevent a large amount of outside air from flowing into the optical box 107 from 08.
【０００６】[0006]
【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、光学箱の隔壁やふたに設けた突出部だ
けでは回転多面鏡のまわりに流入する外気の量を充分に
低減できず、外気とともに侵入した粉塵が回転多面鏡の
モータやそのまわりに堆積する。このような粉塵が、モ
ータが回転するたびに舞い上がって回転多面鏡の反射面
を著しく汚染し、偏向走査装置の光学性能が大きく損わ
れるという未解決の課題がある。However, according to the above-mentioned conventional technique, the amount of the outside air flowing around the rotary polygon mirror cannot be sufficiently reduced only by the protrusion provided on the partition wall or the lid of the optical box. The dust that has entered together accumulates on the motor of the rotating polygon mirror and around it. There is an unsolved problem that such dust rises up every time the motor rotates and contaminates the reflective surface of the rotary polygon mirror significantly, and the optical performance of the deflection scanning device is greatly impaired.
【０００７】回転多面鏡の反射面の汚染等を防ぐために
回転多面鏡やそのモータを覆うカバー部材を設けたもの
も開発されているが、モータのコイルから発生する熱
や、モータの軸受部の摩擦熱あるいはモータの駆動回路
の発熱等によってカバー部材の内部の温度が著しく上昇
するため、回転多面鏡の反射面の熱歪による反射特性の
劣化が新たな問題となる。Although a rotary polygon mirror and a cover member for covering the motor are provided to prevent the reflection surface of the rotary polygon mirror from being contaminated, heat generated from a coil of the motor and a bearing portion of the motor have been developed. Since the internal temperature of the cover member rises remarkably due to frictional heat or heat generation of the drive circuit of the motor, deterioration of the reflection characteristics due to thermal strain of the reflection surface of the rotary polygon mirror becomes a new problem.
【０００８】近年では、特に、印刷速度等の高速化が要
求され、これに伴って回転多面鏡のモータやその軸受部
等の発熱量も著しく増大しており、回転多面鏡のモータ
等駆動部の放熱を妨げることなく回転多面鏡を外気から
効果的に遮断することのできる偏向走査装置の開発が望
まれている。In recent years, in particular, there has been a demand for higher printing speed and the like, and along with this, the amount of heat generated by the motor of the rotary polygon mirror and its bearings has increased significantly. It is desired to develop a deflection scanning device that can effectively shield the rotary polygon mirror from the outside air without hindering the heat radiation of the rotary polygon mirror.
【０００９】本発明は上記従来の技術の有する未解決の
課題に鑑みてなされたものであり、回転多面鏡を覆うカ
バー部材の内部の温度が著しく上昇するおそれのない偏
向走査装置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 unsolved problems of the prior art, and provides a deflection scanning apparatus in which the temperature inside the cover member that covers the rotary polygon mirror does not rise significantly. The purpose is.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、本発明の偏向走査装置は、回転多面鏡と、これを回
転させる駆動部と、前記回転多面鏡を覆うカバー部材
と、少なくとも前記回転多面鏡と前記カバー部材を収容
する収容手段を有し、前記カバー部材の一部分が前記収
容手段の表面に露出していることを特徴とする。In order to achieve the above object, a deflection scanning device of the present invention comprises a rotary polygonal mirror, a drive unit for rotating the rotary polygonal mirror, a cover member for covering the rotary polygonal mirror, and at least the rotary polygon mirror. It is characterized in that it has a housing means for housing the polygon mirror and the cover member, and a part of the cover member is exposed on the surface of the housing means.
【００１１】カバー部材の、少なくとも収容手段の表面
に露出する部分が金属製であるとよい。At least the portion of the cover member exposed on the surface of the accommodating means is preferably made of metal.
【００１２】また、カバー部材の、少なくとも回転多面
鏡の駆動部を囲む部分が樹脂製であるとよい。Further, it is preferable that at least a portion of the cover member surrounding the driving portion of the rotary polygon mirror is made of resin.
【００１３】収容手段が光学箱とこれを閉塞するふたを
有し、該ふたが、カバー部材の一部分を突出させるため
の開口を備えているとよい。It is preferable that the accommodating means has an optical box and a lid for closing the optical box, and the lid has an opening for projecting a part of the cover member.
【００１４】また、ふたの開口とこれから突出するカバ
ー部材の一部分との間から光学箱に流入する外気を清浄
化するためのフィルタが設けられているとよい。Further, it is preferable that a filter is provided for cleaning the outside air flowing into the optical box from between the opening of the lid and a part of the cover member protruding from the opening.
【００１５】収容手段が光学箱とこれを閉塞するふたを
有し、カバー部材が前記ふたによって閉塞される開口を
備えていてもよい。The accommodating means may have an optical box and a lid for closing the optical box, and the cover member may have an opening closed by the lid.
【００１６】[0016]
【作用】回転多面鏡がカバー部材によって覆われている
ため、回転多面鏡の反射面の汚染を防ぎ、偏向走査装置
のメンテナンスのコストを低減できる。また、カバー部
材の一部分が収容手段の表面に露出して外気と接触して
いるため、カバー部材の内部の熱を速やかに放出するこ
とができる。これによって、回転多面鏡の駆動部等から
発生する熱がカバー部材の内部の温度を著しく上昇させ
るのを防ぎ、回転多面鏡の熱歪のためにその反射面の反
射特性が変化するのを回避できる。Since the rotary polygon mirror is covered by the cover member, the reflection surface of the rotary polygon mirror can be prevented from being contaminated and the maintenance cost of the deflection scanning device can be reduced. Further, since a part of the cover member is exposed on the surface of the accommodating means and is in contact with the outside air, the heat inside the cover member can be quickly released. This prevents the heat generated from the driving part of the rotating polygon mirror from significantly increasing the temperature inside the cover member, and prevents the reflection characteristics of the reflecting surface from changing due to thermal distortion of the rotating polygon mirror. it can.
【００１７】カバー部材の、少なくとも収容手段の表面
に露出する部分が金属製であれば、カバー部材の放熱効
果をより一層高めることができる。If at least the portion of the cover member exposed on the surface of the accommodating means is made of metal, the heat radiation effect of the cover member can be further enhanced.
【００１８】また、カバー部材の、少なくとも回転多面
鏡の駆動部を囲む部分が樹脂製であれば、回転多面鏡の
駆動部の磁気特性等を損うおそれがない。If the portion of the cover member surrounding at least the driving portion of the rotary polygon mirror is made of resin, there is no risk of deteriorating the magnetic characteristics of the driving portion of the rotary polygon mirror.
【００１９】また、収容手段が光学箱とこれを閉塞する
ふたを有し、カバー部材が前記ふたによって閉塞される
開口を備えていれば、収容手段とカバー部材の双方の部
品コストを大幅に低減できる。If the accommodating means has an optical box and a lid for closing the optical box and the cover member has an opening that is closed by the lid, the cost of both the accommodating means and the cover member can be greatly reduced. it can.
【００２０】[0020]
【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.
【００２１】図１は第１実施例による偏向走査装置を示
す模式断面図であって、これは、図示しない光源から発
生されたレーザ光をシリンドリカルレンズによって線状
の光束に集光し、回転多面鏡３によってその回転軸に沿
った方向（以下、「Ｚ軸方向」という。）に垂直な所定
の走査方向（以下、「Ｙ軸方向」という。）に偏向走査
し、球面レンズ４ａとトーリックレンズ４ｂからなる結
像レンズ系４を経て回転ドラム５上の感光体に結像させ
る。感光体に結像する光束は、回転多面鏡３の回転によ
るＹ軸方向の主走査と、回転ドラム５の回転によるＺ軸
方向の副走査によって静電潜像を形成する。FIG. 1 is a schematic cross-sectional view showing a deflection scanning device according to the first embodiment, in which a laser beam generated from a light source (not shown) is condensed into a linear light beam by a cylindrical lens to rotate a polygonal surface. The mirror 3 deflects and scans in a predetermined scanning direction (hereinafter, referred to as “Y-axis direction”) perpendicular to the direction along the rotation axis (hereinafter, referred to as “Z-axis direction”), and the spherical lens 4a and the toric lens. An image is formed on the photoconductor on the rotary drum 5 via the imaging lens system 4 composed of 4b. The light flux imaged on the photoconductor forms an electrostatic latent image by main scanning in the Y-axis direction by rotation of the rotary polygon mirror 3 and sub-scanning in the Z-axis direction by rotation of the rotary drum 5.
【００２２】回転多面鏡３の走査光Ｌ1 は、その走査面
（ＸＹ平面）のＹ軸方向の一端に達したものが図示しな
いＢＤセンサに導入され、走査開始信号に変換されて光
源に送信される。光源は走査開始信号を受信したうえで
書き込み変調を開始する。The scanning light L 1 of the rotary polygon mirror 3, which reaches one end of the scanning surface (XY plane) in the Y-axis direction, is introduced into a BD sensor (not shown), converted into a scanning start signal and transmitted to the light source. To be done. The light source receives the scan start signal and then starts the write modulation.
【００２３】光源やシリンドリカルレンズ、回転多面鏡
３、結像レンズ系４、ＢＤセンサ等は偏向走査装置の本
体フレーム６と一体である光学箱７の側壁や底壁に取り
付けられる。回転ドラム５は光学箱７の外側に配設され
ており、光学箱７の側壁には走査光Ｌ1 を光学箱７から
回転ドラム５に向かって取り出すための窓８が設けられ
ている。また、光学箱７の上部開口は、光学箱７ととも
に収容手段を構成するふた９によって閉塞されている。The light source, the cylindrical lens, the rotary polygonal mirror 3, the imaging lens system 4, the BD sensor, etc. are attached to the side wall and bottom wall of an optical box 7 which is integral with the body frame 6 of the deflection scanning device. The rotary drum 5 is arranged outside the optical box 7, and a side wall of the optical box 7 is provided with a window 8 for taking out the scanning light L 1 from the optical box 7 toward the rotary drum 5. Further, the upper opening of the optical box 7 is closed by a lid 9 that constitutes a housing means together with the optical box 7.
【００２４】回転多面鏡３を回転させる駆動部は、光学
箱７の底壁に固定されたモータ基板上のステータとこれ
に対向するロータからなる小型のモータ３ａを有し、回
転多面鏡３とモータ３ａは円筒状のカバー部材１０によ
って覆われている。The drive unit for rotating the rotary polygonal mirror 3 has a small motor 3a composed of a stator on a motor substrate fixed to the bottom wall of the optical box 7 and a rotor facing the stator. The motor 3a is covered with a cylindrical cover member 10.
【００２５】カバー部材１０は、光学箱７の底壁にビス
止めされるフランジ部１０ａと、回転多面鏡３の外周部
の反射面とモータ３ａを包囲する筒状部分１０ｂと、そ
の上端と一体である円板部分１０ｃからなり、筒状部分
１０ｂの上部と円板部分１０ｃはふた９に設けられた開
口９ａから光学箱７の外へ突出して配設される。なお、
カバー部材１０の筒状部分１０ｂには、光源のレーザ光
を回転多面鏡３の反射面に導入し、回転多面鏡３によっ
て走査された走査光Ｌ1 を取り出すための窓１１が設け
られる。The cover member 10 is integrally formed with a flange portion 10a screwed to the bottom wall of the optical box 7, a reflecting surface on the outer peripheral portion of the rotary polygon mirror 3 and a cylindrical portion 10b surrounding the motor 3a, and its upper end. And the upper portion of the cylindrical portion 10b and the disc portion 10c are arranged so as to project to the outside of the optical box 7 through an opening 9a provided in the lid 9. In addition,
The cylindrical portion 10b of the cover member 10 is provided with a window 11 for introducing the laser light of the light source to the reflecting surface of the rotary polygon mirror 3 and taking out the scanning light L 1 scanned by the rotary polygon mirror 3.
【００２６】また、光学箱７は従来例と同様の図示しな
い隔壁を有し、ふた９は球面レンズ４ａに向かって突出
する突出部１２を有し、これらによって光学箱７の内部
空間が２分割されている。Further, the optical box 7 has a partition wall (not shown) similar to the conventional example, and the lid 9 has a projecting portion 12 projecting toward the spherical lens 4a, whereby the inner space of the optical box 7 is divided into two. Has been done.
【００２７】本実施例によれば、回転多面鏡とそのモー
タのまわりがカバー部材によって覆われているため、光
学箱の窓から外気とともに侵入する粉塵等によって回転
多面鏡の反射面が汚染されるのを効果的に防ぎ、偏向走
査装置のメンテナンスのコストを大きく低減できる。ま
た、カバー部材の上部が光学箱のふたから外へ突出して
いるため、回転多面鏡のモータやその軸受部等から発生
する熱がカバー部材の上部から迅速に放出され、モータ
を高速回転させてもカバー部材の内部が著しく昇温する
おそれがない。従って、回転多面鏡を高速回転させたと
きにその反射面の熱歪によって偏向走査装置の光学性能
が劣化するのを回避できる。According to this embodiment, since the rotary polygon mirror and its motor are surrounded by the cover member, the reflecting surface of the rotary polygon mirror is contaminated by dust or the like entering from the window of the optical box together with the outside air. Can be effectively prevented, and the maintenance cost of the deflection scanning device can be greatly reduced. In addition, since the upper part of the cover member projects out from the lid of the optical box, heat generated from the motor of the rotary polygon mirror and its bearings is rapidly released from the upper part of the cover member, and the motor is rotated at high speed. However, there is no possibility that the temperature inside the cover member will rise significantly. Therefore, when the rotary polygon mirror is rotated at a high speed, it is possible to prevent the optical performance of the deflection scanning device from being deteriorated due to the thermal strain of the reflecting surface.
【００２８】カバー部材の材質は、各種合成樹脂あるい
はアルミニウム、亜鉛、黄銅等の金属材料が望ましい。
特に、上記の放熱効果と製造コストの観点からアルミダ
イカストや亜鉛ダイカスト等の金属部材が好適である。The material of the cover member is preferably various synthetic resins or metal materials such as aluminum, zinc and brass.
In particular, a metal member such as aluminum die casting or zinc die casting is preferable from the viewpoint of the above heat radiation effect and manufacturing cost.
【００２９】また、カバー部材の円板部分に放熱性を高
めるためのフィン等を設けたり、光学箱の外側にファン
を設けてふたから突出するカバー部材の上部の外気を強
制流動させれば、放熱効果を促進するのに大きく役立
つ。Further, if fins or the like are provided on the disc portion of the cover member to enhance heat dissipation, or if a fan is provided outside the optical box to force the outside air above the cover member protruding from the lid to flow, Greatly helps in radiating heat.
【００３０】図２は第１実施例の第１変形例を示すもの
で、これは、カバー部材１０の円板部分１０ｃの外周部
に段差部１３を設け、これをふた９の内側に配設すると
ともに、カバー部材１０の段差部１３とふた９の間にリ
ング状のフィルタ１４を充填したものである。フィルタ
１４は、外気中の粉塵がふた９の開口９ａから光学箱７
の内部へ侵入するのを防ぐ役目をする。FIG. 2 shows a first modified example of the first embodiment, in which a step portion 13 is provided on the outer peripheral portion of the disc portion 10c of the cover member 10 and is arranged inside the lid 9. In addition, the ring-shaped filter 14 is filled between the step portion 13 of the cover member 10 and the lid 9. The filter 14 is provided with the optical box 7 through the opening 9a of the lid 9 for dust in the outside air.
Serves to prevent entry into the interior of the.
【００３１】また、ふた９に突出部１２を設ける替わり
に、ふた９と球面レンズ４ａの間にフィルタ１４と同様
のフィルタ１５を配設し、光学箱７の窓８から流入して
回転多面鏡３に向かう外気中の粉塵を除去するように構
成されている。Further, instead of providing the projection 12 on the lid 9, a filter 15 similar to the filter 14 is arranged between the lid 9 and the spherical lens 4a, and the filter 15 flows in through the window 8 of the optical box 7 and rotates. It is configured to remove dust in the outside air that is directed to the air conditioner 3.
【００３２】本変形例によれば、光学箱の窓やカバー部
材とふたの間から光学箱に流入して回転多面鏡の反射面
を汚染する粉塵等を効果的に除去することができるた
め、回転多面鏡が高速度で回転してもその反射面を極め
て長時間クリーンに維持できるという長所が付加され
る。その結果、高速化に適しており、しかも高性能でメ
ンテナンスのコストの低い偏向走査装置を実現できる。According to this modification, it is possible to effectively remove dust or the like that flows into the optical box from between the window of the optical box and the cover member and the lid and contaminates the reflecting surface of the rotary polygon mirror. Even if the rotating polygon mirror rotates at a high speed, the additional advantage is that its reflecting surface can be kept clean for an extremely long time. As a result, it is possible to realize a deflection scanning device which is suitable for high speed operation, has high performance, and has low maintenance cost.
【００３３】図３は第１実施例の第２変形例を示すもの
で、これは、カバー部材１０のフランジ部１０ａと筒状
部分１０ｂの材質が合成樹脂であり、これらを一体成形
するときに、円板部分１０ｃとして放熱性のよい金属部
材１６をインサートして埋め込んだものである。回転多
面鏡３のモータ３ａの周囲に配設されるカバー部材１０
のフランジ部１０ａや筒状部分１０ｂが金属製である場
合にはモータ３ａの磁気回路に悪影響を与えるおそれが
あるが、本変形例はこのようなトラブルを回避し、しか
もカバー部材１０内の昇温を防ぐ効果も充分である。FIG. 3 shows a second modification of the first embodiment, in which the material of the flange portion 10a and the tubular portion 10b of the cover member 10 is synthetic resin, and when these are integrally molded. A metal member 16 having good heat dissipation is inserted and embedded as the disc portion 10c. A cover member 10 arranged around the motor 3a of the rotary polygon mirror 3.
If the flange portion 10a and the cylindrical portion 10b of the motor 3 are made of metal, the magnetic circuit of the motor 3a may be adversely affected. The effect of preventing heat is also sufficient.
【００３４】図４は第２実施例による偏向走査装置を示
す模式断面図であって、これは、第１実施例のカバー部
材１０の替わりに、フランジ部３０ａと筒状部分３０ｂ
のみであって、上端が開口しているカバー部材３０を用
いるもので、カバー部材３０の上端の開口は光学箱２７
のふた２９によって閉塞される。カバー部材３０に円板
部分を設ける必要がないうえに、ふた２９にカバー部材
３０を突出させる開口を設ける必要もないため、カバー
部材３０とふた２９の双方の部品コストを低減できる。FIG. 4 is a schematic cross-sectional view showing a deflection scanning device according to the second embodiment. This is different from the cover member 10 of the first embodiment in that it has a flange portion 30a and a tubular portion 30b.
Only the cover member 30 having an open upper end is used, and the upper end opening of the cover member 30 is the optical box 27.
It is closed by the lid 29. Since it is not necessary to provide the cover member 30 with a disc portion and it is not necessary to provide the lid 29 with an opening through which the cover member 30 projects, the cost of both the cover member 30 and the lid 29 can be reduced.
【００３５】カバー部材３０の上端とふた２９の間に
は、ゴムやスポンジで作られたシール部材３４が配設さ
れ、カバー部材３０内に外気が流入するのを防ぐ。ま
た、球面レンズ４ａとふた２９の間にはフィルタ３５が
配設され、光学箱２７の窓２８から回転多面鏡３に向か
う外気を清浄化する。A seal member 34 made of rubber or sponge is disposed between the upper end of the cover member 30 and the lid 29 to prevent outside air from flowing into the cover member 30. A filter 35 is arranged between the spherical lens 4a and the lid 29 to clean the outside air from the window 28 of the optical box 27 toward the rotary polygon mirror 3.
【００３６】このようにして、回転多面鏡の反射面の汚
染を極めて効果的に防ぐことができる。In this way, the contamination of the reflecting surface of the rotary polygon mirror can be prevented very effectively.
【００３７】その結果、より一層メンテナンスコストが
低く、しかも部品コストを大幅に低減した偏向走査装置
を実現することができる。As a result, it is possible to realize a deflection scanning apparatus which has a much lower maintenance cost and a significantly reduced component cost.
【００３８】また、ふた２９は、カバー部材３０の放熱
効果を高めるために薄い鋼板等によって製作するのが望
ましい。The lid 29 is preferably made of a thin steel plate or the like in order to enhance the heat radiation effect of the cover member 30.
【００３９】その他の点は第１実施例と同様であるので
同じ符号で表わし、説明は省略する。Since the other points are the same as those of the first embodiment, they are represented by the same reference numerals, and the description thereof will be omitted.
【００４０】[0040]
【発明の効果】本発明は上述のとおり構成されているの
で、次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.
【００４１】回転多面鏡をカバー部材によって覆うこと
で回転多面鏡の反射面の汚染を防ぎ、これによって偏向
走査装置のメンテナンスのコストを大幅に低減するとと
もに、回転多面鏡のモータの発熱等のためにカバー部材
の内部の温度が上昇するのを防ぎ、回転多面鏡の反射面
の熱歪等に起因する反射特性の劣化を回避できる。その
結果、メンテナンスのコストが低く、しかも光学性能の
安定した偏向走査装置を実現できる。By covering the rotary polygon mirror with a cover member, the reflection surface of the rotary polygon mirror is prevented from being contaminated, thereby significantly reducing the maintenance cost of the deflection scanning device and heating the motor of the rotary polygon mirror. Further, it is possible to prevent the temperature inside the cover member from rising, and to avoid the deterioration of the reflection characteristics due to the thermal strain of the reflecting surface of the rotary polygon mirror. As a result, it is possible to realize a deflection scanning device with low maintenance cost and stable optical performance.
【００４２】特に、回転多面鏡を高速回転させるとモー
タ等の発熱量が増大するため、回転多面鏡の熱歪による
反射面の反射特性が著しく劣化するおそれがあるが、こ
れを、カバー部材の放熱によって回避し、偏向走査装置
の高速化に大きく貢献できる。Particularly, when the rotating polygon mirror is rotated at a high speed, the amount of heat generated by the motor or the like increases, so that the reflection characteristic of the reflecting surface may be significantly deteriorated due to thermal strain of the rotating polygon mirror. This can be avoided by radiating heat, which can greatly contribute to the speedup of the deflection scanning device.
【図１】第１実施例による偏向走査装置を示す模式断面
図である。FIG. 1 is a schematic sectional view showing a deflection scanning device according to a first embodiment.
【図２】第１実施例の第１変形例を示す模式断面図であ
る。FIG. 2 is a schematic cross-sectional view showing a first modification of the first embodiment.
【図３】第１実施例の第２変形例を示す模式断面図であ
る。FIG. 3 is a schematic cross-sectional view showing a second modification of the first embodiment.
【図４】第２実施例による偏向走査装置を示す模式断面
図である。FIG. 4 is a schematic sectional view showing a deflection scanning device according to a second embodiment.
【図５】一従来例による偏向走査装置を示す模式平面図
である。FIG. 5 is a schematic plan view showing a deflection scanning device according to a conventional example.
【図６】図５の装置を示す模式断面図である。6 is a schematic cross-sectional view showing the device of FIG.
３ 回転多面鏡 ４ 結像レンズ系 ５ 回転ドラム ７，２７ 光学箱 ８，１１，２８ 窓 ９，２９ ふた １０，３０ カバー部材 １２ 突出部 １３ 段差部 １４，１５，３５ フィルタ １６ 金属部材 ３４ シール部材 3 Rotating polygonal mirror 4 Imaging lens system 5 Rotating drum 7,27 Optical box 8,11,28 Window 9,29 Lid 10,30 Cover member 12 Projection part 13 Step part 14,15,35 Filter 16 Metal member 34 Seal member
Claims (6)
と、前記回転多面鏡を覆うカバー部材と、少なくとも前
記回転多面鏡と前記カバー部材を収容する収容手段を有
し、前記カバー部材の一部分が前記収容手段の表面に露
出していることを特徴とする偏向走査装置。1. A rotary polygon mirror, a drive unit for rotating the rotary polygon mirror, a cover member for covering the rotary polygon mirror, and a housing means for housing at least the rotary polygon mirror and the cover member. A deflection scanning device, characterized in that a part thereof is exposed on the surface of the accommodating means.
面に露出する部分が金属製であることを特徴とする請求
項１記載の偏向走査装置。2. The deflection scanning device according to claim 1, wherein at least a portion of the cover member exposed on the surface of the accommodating means is made of metal.
駆動部を囲む部分が樹脂製であることを特徴とする請求
項１または２記載の偏向走査装置。3. The deflection scanning device according to claim 1, wherein at least a portion of the cover member surrounding the driving portion of the rotary polygon mirror is made of resin.
を有し、該ふたが、カバー部材の一部分を突出させるた
めの開口を備えていることを特徴とする請求項１ないし
３いずれか１項記載の偏向走査装置。4. The housing means has an optical box and a lid for closing the optical box, and the lid has an opening for allowing a part of the cover member to protrude. The deflection scanning device according to item 1.
材の一部分との間から光学箱に流入する外気を清浄化す
るためのフィルタが設けられていることを特徴とする請
求項４記載の偏向走査装置。5. The deflection scanning according to claim 4, further comprising a filter for cleaning the outside air flowing into the optical box from between the opening of the lid and a part of the cover member protruding from the opening. apparatus.
を有し、カバー部材が前記ふたによって閉塞される開口
を備えていることを特徴とする請求項１ないし３いずれ
か１項記載の偏向走査装置。6. The container according to claim 1, wherein the housing means has an optical box and a lid for closing the optical box, and the cover member has an opening closed by the lid. Deflection scanning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08321395A JP3294734B2 (en) | 1995-03-15 | 1995-03-15 | Deflection scanning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08321395A JP3294734B2 (en) | 1995-03-15 | 1995-03-15 | Deflection scanning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08254665A true JPH08254665A (en) | 1996-10-01 |
| JP3294734B2 JP3294734B2 (en) | 2002-06-24 |
Family
ID=13796047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08321395A Expired - Fee Related JP3294734B2 (en) | 1995-03-15 | 1995-03-15 | Deflection scanning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3294734B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000002854A (en) * | 1998-06-15 | 2000-01-07 | Canon Inc | Light deflection scanning device and image forming device equipped therewith |
| JP2005115296A (en) * | 2003-09-18 | 2005-04-28 | Ricoh Co Ltd | Optical scanner and image forming apparatus |
| KR100509472B1 (en) * | 1999-01-25 | 2005-08-22 | 삼성전자주식회사 | Liquid electrophotographic imaging system |
| JP2008216761A (en) * | 2007-03-06 | 2008-09-18 | Ricoh Co Ltd | Optical scanner and image forming apparatus |
-
1995
- 1995-03-15 JP JP08321395A patent/JP3294734B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000002854A (en) * | 1998-06-15 | 2000-01-07 | Canon Inc | Light deflection scanning device and image forming device equipped therewith |
| KR100509472B1 (en) * | 1999-01-25 | 2005-08-22 | 삼성전자주식회사 | Liquid electrophotographic imaging system |
| JP2005115296A (en) * | 2003-09-18 | 2005-04-28 | Ricoh Co Ltd | Optical scanner and image forming apparatus |
| JP4500526B2 (en) * | 2003-09-18 | 2010-07-14 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP2008216761A (en) * | 2007-03-06 | 2008-09-18 | Ricoh Co Ltd | Optical scanner and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3294734B2 (en) | 2002-06-24 |
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