JP2013029651A - Optical scanning device and image forming apparatus including the same - Google Patents

Optical scanning device and image forming apparatus including the same Download PDF

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JP2013029651A
JP2013029651A JP2011165338A JP2011165338A JP2013029651A JP 2013029651 A JP2013029651 A JP 2013029651A JP 2011165338 A JP2011165338 A JP 2011165338A JP 2011165338 A JP2011165338 A JP 2011165338A JP 2013029651 A JP2013029651 A JP 2013029651A
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polygon
optical scanning
scanning device
image forming
screw
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JP5593282B2 (en
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Hideki Okamura
秀樹 岡村
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Kyocera Document Solutions Inc
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Abstract

PROBLEM TO BE SOLVED: To provide an optical scanning device that enables the resonance of a housing and a folding mirror to be suppressed even if a polygon motor is utilized in common at multiple frequencies.SOLUTION: In an optical scanning device, light emitted from a light source is made incident through an optical element on a polygon mirror 25, and the light deflected by the polygon mirror 25 is imaged using a scanning lens to expose and scan an image carrier. Also, a polygon substrate 32 including a rotation axis 31 of the polygon mirror 25 is mounted on a housing 21 at multiple fastening points a to g, and a vibration damping screw fastening point P is provided on the outside of a triangle area which is formed by connecting three fastening points e, f, g among the multiple fastening points a to g. The vibration damping screw fastening point P of the polygon substrate 32 is mounted to the housing by a screw-inserted screw at the vibration damping screw fastening point P.

Description

本発明は、感光ドラム等の像担持体上を露光走査する光走査装置とこれを備えた複写機やプリンター等の画像形成装置に関するものである。   The present invention relates to an optical scanning device that exposes and scans an image carrier such as a photosensitive drum, and an image forming apparatus such as a copying machine and a printer including the optical scanning device.

電子写真方式によって用紙等の記録材に画像を形成する複写機やプリンター等の画像形成装置においては、帯電器によって表面が一様に帯電された感光ドラム等の像担持体が光走査装置によって露光走査され、その表面に画像情報に応じた静電潜像が形成される。そして、像担持体上に形成された静電潜像は、現像装置によって現像剤であるトナーを用いて現像されてトナー像として顕像化され、このトナー像が記録材上に転写される。このようにトナー像が転写された記録材は、定着装置へと搬送され、該定着装置によって加熱及び加圧されてトナー像の定着を受け後に機外に排出され、これによって一連の画像形成動作が完了する。   In an image forming apparatus such as a copying machine or a printer that forms an image on a recording material such as paper by an electrophotographic method, an image carrier such as a photosensitive drum whose surface is uniformly charged by a charger is exposed by an optical scanning device. Scanning is performed, and an electrostatic latent image corresponding to image information is formed on the surface. The electrostatic latent image formed on the image carrier is developed by a developing device using toner as a developer to be visualized as a toner image, and the toner image is transferred onto a recording material. The recording material onto which the toner image has been transferred in this way is conveyed to a fixing device, heated and pressurized by the fixing device, and after being fixed on the toner image, is discharged out of the apparatus, thereby performing a series of image forming operations. Is completed.

ところで、光走査装置は、レーザーダイオード（ＬＤ）等の光源から出射される光をコリメータレンズやシリンドリカルレンズ等の光学素子を経て変更手段であるポリゴンミラーに入射させ、該ポリゴンミラーによって偏向された光を走査レンズによって結像させて感光ドラム等の像担持体を露光走査するものである。   By the way, an optical scanning device makes light emitted from a light source such as a laser diode (LD) incident on a polygon mirror which is a changing means via an optical element such as a collimator lens or a cylindrical lens, and is deflected by the polygon mirror. Is imaged by a scanning lens, and an image carrier such as a photosensitive drum is exposed and scanned.

斯かる光走査装置においては、高速で回転するポリゴンミラノ振動によって筐体や折り返しミラー等が共振し、画像にジッターが発生する等の問題が起こり易い。   In such an optical scanning device, problems such as occurrence of jitter in the image easily occur due to resonance of the casing, the folding mirror, and the like due to polygonal Milan vibration rotating at high speed.

そこで、特許文献１には、長尺であるために振動し易い折り返しミラーの中央部分に重りを接着し、該折り返しミラーの共振周波数をポリゴンミラーの回転による振動の周波数から遠ざけることによって折り返しミラーの振動を防ぐようにした構成が提案されている。   Therefore, in Patent Document 1, a weight is attached to the central portion of the folding mirror that is long and easily vibrates, and the resonance frequency of the folding mirror is kept away from the vibration frequency due to rotation of the polygon mirror. A configuration for preventing vibration has been proposed.

特開平９−１２００３９号公報Japanese Patent Laid-Open No. 9-120039

しかしながら、特許文献１において提案された構成によれば、重りの追加によるコストアップを招く他、線速が異なる複数の光走査装置にポリゴンモーターを複数の周波数（回転数）で共通に使用した場合には、筐体や折り返しミラーの共振が避けられないという問題がある。   However, according to the configuration proposed in Patent Document 1, in addition to incurring costs due to the addition of weights, a polygon motor is commonly used at a plurality of frequencies (number of rotations) for a plurality of optical scanning devices having different linear velocities. However, there is a problem that resonance of the casing and the folding mirror is unavoidable.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、ポリゴンモーターを複数の周波数で共通に使用しても、筐体や折り返しミラー等の共振を抑制することができる光走査装置とジッター等の画像欠陥の発生を防いで高質画像を安定的に得ることができる画像形成装置を提供することにある。   The present invention has been made in view of the above problems, and an object of the present invention is to perform optical scanning that can suppress resonance of a casing, a folding mirror, and the like even when a polygon motor is commonly used at a plurality of frequencies. An object of the present invention is to provide an image forming apparatus capable of stably obtaining a high-quality image by preventing occurrence of image defects such as the apparatus and jitter.

上記目的を達成するため、請求項１記載の発明は、光源から出射される光を光学素子を経てポリゴンミラーに入射させ、該ポリゴンミラーによって偏向された光を走査レンズによって結像させて像担持体を露光走査する光走査装置において、前記ポリゴンミラーの回転軸を内包するポリゴン基板を複数の締結点において筐体に取り付け、前記複数の締結点のうちの３つの締結点を結んで形成される三角形の領域の外側に制振ビス締結点を設け、該制振ビス締結点に螺合挿通するビスによってポリゴン基板の制振ビス締結点を前記筐体に取り付けたことを特徴とする。   In order to achieve the above object, according to the first aspect of the present invention, the light emitted from the light source is incident on the polygon mirror through the optical element, and the light deflected by the polygon mirror is imaged by the scanning lens to carry the image. In an optical scanning apparatus for exposing and scanning a body, a polygon substrate containing a rotation axis of the polygon mirror is attached to a housing at a plurality of fastening points, and is formed by connecting three fastening points among the plurality of fastening points. A damping screw fastening point is provided outside the triangular area, and the damping screw fastening point of the polygon substrate is attached to the casing by a screw threadedly inserted into the damping screw fastening point.

請求項２記載の発明は、請求項１記載の発明において、前記ビスの頭部と前記ポリゴン基板との間にバネを縮装したことを特徴とする。   The invention according to claim 2 is characterized in that, in the invention according to claim 1, a spring is mounted between the head of the screw and the polygon substrate.

請求項３記載の画像形成装置は、請求項１又は２記載の光走査装置を備えることを特徴とする。   An image forming apparatus according to a third aspect includes the optical scanning device according to the first or second aspect.

請求項１記載の発明によれば、ポリゴン基板の３つの締結点を結んで形成される三角形の領域の外側に設けられた制振ビス締結点をこれに螺合挿通するビスで筐体に取り付けることによって、ポリゴン基板や筐体の固有振動数を共振周波数から遠ざけることができるため、部品の追加を要することなく筐体や折り返しミラー等の共振を抑制することができる。又、ビスの締付力を調整することによってポリゴン基板や筐体の固有振動数を調整することができるため、ポリゴンモーターを異なる機種の光走査装置において複数の周波数で共通に使用しても、筐体や折り返しミラー等の共振を抑制することができる。   According to the first aspect of the present invention, the damping screw fastening point provided outside the triangular region formed by connecting the three fastening points of the polygon substrate is attached to the housing with the screw that is screwed into this. As a result, the natural frequency of the polygon substrate and the housing can be kept away from the resonance frequency, and therefore the resonance of the housing, the folding mirror, and the like can be suppressed without requiring the addition of parts. In addition, since the natural frequency of the polygon substrate and the case can be adjusted by adjusting the screw tightening force, even if the polygon motor is used in common at multiple frequencies in different types of optical scanning devices, Resonance of the casing and the folding mirror can be suppressed.

請求項２記載の発明によれば、ビスを回転させてその移動量を調整することによってバネによるポリゴン基板への押圧力が変化し、該ポリゴン基板の固有振動数が任意に調整されるため、ポリゴンモーターを異なる機種の光走査装置において複数の周波数で共通に使用することができる。   According to the second aspect of the present invention, the pressing force to the polygon substrate by the spring is changed by rotating the screw and adjusting the movement amount, and the natural frequency of the polygon substrate is arbitrarily adjusted. The polygon motor can be commonly used at a plurality of frequencies in different types of optical scanning devices.

請求項３記載の発明によれば、光走査装置の筐体や折り返しミラー等の共振が抑制されるため、ジッター等の画像欠陥の無い高質画像を安定的に得ることができる。   According to the third aspect of the invention, since the resonance of the casing of the optical scanning device, the folding mirror, and the like is suppressed, a high-quality image free from image defects such as jitter can be stably obtained.

本発明に係る画像形成装置の断面図である。1 is a cross-sectional view of an image forming apparatus according to the present invention. 本発明に係る光走査装置の斜視図である。1 is a perspective view of an optical scanning device according to the present invention. 本発明に係る光走査装置のポリゴンミラーとポリゴン基板の平面図である。It is a top view of the polygon mirror and polygon substrate of the optical scanning device concerning the present invention. 図３のＡ−Ａ線断面図である。FIG. 4 is a sectional view taken along line AA in FIG. 3.

以下に本発明の実施の形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

［画像形成装置］
図１は本発明に係る画像形成装置の縦断面図であり、図示の画像形成装置１はレーザープリンターであって、装置本体１Ａの内部上方には、画像形成部２が配され、装置本体１Ａ内の下半部には用紙収納部３が配されている。 [Image forming apparatus]
FIG. 1 is a longitudinal sectional view of an image forming apparatus according to the present invention. The illustrated image forming apparatus 1 is a laser printer, and an image forming unit 2 is disposed above the inside of the apparatus main body 1A. A sheet storage unit 3 is disposed in the lower half of the inside.

上記画像形成部２は、電子写真方式によって画像を形成するものであって、回転可能に配された像担持体としての感光ドラム４と、その周囲に配された帯電器５、現像装置６、転写ローラー７及びクリーニング装置８の他、現像装置６に現像剤であるトナーを補給するためのトナーホッパー９を備えている。そして、画像形成部２の横には、本発明に係る光走査装置（レーザースキャナーユニット（ＬＳＵ））１０が配置されている。   The image forming unit 2 forms an image by an electrophotographic method. The image forming unit 2 is a photosensitive drum 4 as a rotatable image carrier, a charger 5 disposed around the photosensitive drum 4, a developing device 6, and the like. In addition to the transfer roller 7 and the cleaning device 8, the developing device 6 is provided with a toner hopper 9 for supplying toner as a developer. Next to the image forming unit 2, an optical scanning device (laser scanner unit (LSU)) 10 according to the present invention is arranged.

前記用紙収納部３は、複数枚の用紙が積層収容された着脱可能な上下２段の給紙カセット１１，１２を備えており、各給紙カセット１１，１２の近傍には、各給紙カセット１１，１２内の用紙を上位のものから順次取り出すピックローラー１３と、取り出された用紙を１枚ずつ分離して送り出すフィードローラー１４及びリタードローラー１５がそれぞれ配設されている。   The paper storage unit 3 includes detachable upper and lower two-stage paper feed cassettes 11 and 12 in which a plurality of paper sheets are stacked and accommodated. A pick roller 13 for sequentially taking out the sheets in the upper and lower layers, and a feed roller 14 and a retard roller 15 for separating and feeding out the taken sheets one by one are provided.

又、装置本体１Ａ内には、用紙収納部３から画像形成部２に至る第１搬送経路Ｓ１と、画像形成部２から排紙トレイ１６に至る第２搬送路Ｓ２が配置されており、第１搬送路Ｓ１にはレジストローラー１７と前記転写ローラー７が設けられ、第２搬送路Ｓ２には定着装置１８と搬送ローラー１９及び排紙ローラー２０が設けられている。ここて、定着装置１８は、圧接状態で互いに回転する定着ローラー１８ａと加圧ローラー１８ｂを備えている。   Further, in the apparatus main body 1A, a first transport path S1 from the paper storage unit 3 to the image forming unit 2 and a second transport path S2 from the image forming unit 2 to the paper discharge tray 16 are arranged. A registration roller 17 and the transfer roller 7 are provided in the first conveyance path S1, and a fixing device 18, a conveyance roller 19, and a paper discharge roller 20 are provided in the second conveyance path S2. The fixing device 18 includes a fixing roller 18a and a pressure roller 18b that rotate in a pressure contact state.

次に、以上のように構成された画像形成装置１の画像形成動作について説明する。   Next, an image forming operation of the image forming apparatus 1 configured as described above will be described.

画像形成動作が開始されると、画像形成部２においては感光ドラム４が不図示の駆動手段によって図１の矢印方向（時計方向）に回転駆動され、その表面が帯電器５によって所定の電位に一様に帯電される。そして、パソコン等から送信される電気信号に基づくレーザービームが光走査装置１０から出力されて感光ドラム４の表面が露光走査されると、該感光ドラム４上に画像情報に応じた静電潜像が形成される。そして、この感光ドラム４上に形成された静電潜像は、現像装置６によって現像剤であるトナーを用いて現像されてトナー像として可視像化される。   When the image forming operation is started, in the image forming unit 2, the photosensitive drum 4 is rotationally driven in a direction indicated by an arrow (clockwise) in FIG. Uniformly charged. When a laser beam based on an electrical signal transmitted from a personal computer or the like is output from the optical scanning device 10 and the surface of the photosensitive drum 4 is exposed and scanned, an electrostatic latent image corresponding to image information is formed on the photosensitive drum 4. Is formed. The electrostatic latent image formed on the photosensitive drum 4 is developed by the developing device 6 using toner as a developer to be visualized as a toner image.

ところで、カセット給紙を行う場合、用紙収納部３の例えば上段の給紙カセット１１内に収容された用紙は、ピックローラー１３によって最上位のものからピックアップされ、フィードローラー１４とリタードローラー１５によって１枚ずつ分離されて第１搬送経路路Ｓ１をレジストローラー１７へと搬送される。そして、レジストローラー１７においては、用紙は、一時待機状態とされた後、感光ドラム４上のトナー像に同期する所定のタイミングで画像形成部２へと供給される。   By the way, when cassette feeding is performed, the paper stored in, for example, the upper paper feeding cassette 11 of the paper storage unit 3 is picked up from the uppermost one by the pick roller 13, and 1 by the feed roller 14 and the retard roller 15. Each sheet is separated and conveyed to the registration roller 17 through the first conveyance path S1. In the registration roller 17, after the paper is temporarily in a standby state, the paper is supplied to the image forming unit 2 at a predetermined timing synchronized with the toner image on the photosensitive drum 4.

画像形成部２においては、感光ドラム４と転写ローラー７との間の転写ニップへと供給された用紙は、転写ローラー７によって感光ドラム４に押し付けられながら搬送されることによって、その表面に感光ドラム４上のトナー像が転写される。そして、トナー像が転写された用紙は、定着装置１８へと搬送され、この定着装置１８の定着ローラー１８ａと加圧ローラー１８ｂ間の定着ニップを通過する過程で加熱及び加圧されてトナー像の定着を受ける。尚、用紙へのトナー像の転写後に感光ドラム４の表面に残留するトナー（転写残トナー）はクリーニング装置８によって除去され、表面が清掃された感光ドラム４は次の画像形成動作に備えられる。   In the image forming unit 2, the sheet supplied to the transfer nip between the photosensitive drum 4 and the transfer roller 7 is conveyed while being pressed against the photosensitive drum 4 by the transfer roller 7, so that the surface of the sheet is exposed to the photosensitive drum. The toner image on 4 is transferred. Then, the sheet on which the toner image is transferred is conveyed to the fixing device 18 and heated and pressed in the process of passing through the fixing nip between the fixing roller 18a and the pressure roller 18b of the fixing device 18 to form the toner image. Get fixed. The toner remaining on the surface of the photosensitive drum 4 (transfer residual toner) after the transfer of the toner image onto the paper is removed by the cleaning device 8, and the photosensitive drum 4 whose surface has been cleaned is prepared for the next image forming operation.

而して、定着装置１８にて表面にトナー像が定着された用紙は、第２搬送経路Ｓ２を搬送ローラー１９によって排紙ローラー２０に向かって搬送され、排紙ローラー２０によって排紙トレイ１６へと排出され、これによって一連の画像形成動作が終了する。   Thus, the sheet having the toner image fixed on the surface thereof by the fixing device 18 is transported toward the paper discharge roller 20 by the transport roller 19 through the second transport path S2, and is transported to the paper discharge tray 16 by the paper discharge roller 20. This completes a series of image forming operations.

［光走査装置］
次に、本発明に係る前記光走査装置１０の詳細を図２〜図４に基づいて説明する。 [Optical scanning device]
Next, details of the optical scanning device 10 according to the present invention will be described with reference to FIGS.

図２は本発明に係る光走査装置の斜視図、図３は同光走査装置のポリゴンミラーとポリゴン基板の平面図、図４は図３のＡ−Ａ線断面図であり、図２に示すように、光走査装置１０の筐体２１には光源であるレーザーダイオード（ＬＤ）２２が備えられており、筐体２１内には、レーザーダイオード２２からの光ビームＬの出射方向に沿ってコリメータレンズ２３とシリンドリカルレンズ２４及び偏向手段としてのポリゴンミラー２５が一直線上に配置されている。   2 is a perspective view of the optical scanning device according to the present invention, FIG. 3 is a plan view of a polygon mirror and a polygon substrate of the optical scanning device, and FIG. 4 is a sectional view taken along line AA of FIG. As described above, the housing 21 of the optical scanning device 10 is provided with a laser diode (LD) 22 that is a light source, and a collimator is provided in the housing 21 along the emission direction of the light beam L from the laser diode 22. A lens 23, a cylindrical lens 24, and a polygon mirror 25 as a deflecting means are arranged on a straight line.

又、筐体２１内には、ポリゴンミラー２５によって偏向される光ビームＬの進行方向に沿って２つのｆθレンズ２６，２７と折り返しミラー２８が配設されている。又、光ビームＬの有効走査範囲（実際にプリント幅として使用する走査範囲）Ｒを外れた位置の左右には光検知素子であるＢＤセンサー２９と、ポリゴンミラー２５によって偏向されて有効走査範囲Ｒを外れた光路を進む光ビームＬ１を折り返して前記ＢＤセンサー２９へと導くＢＤミラー３０が配置されている。   In the casing 21, two fθ lenses 26 and 27 and a folding mirror 28 are disposed along the traveling direction of the light beam L deflected by the polygon mirror 25. Further, the effective scanning range R is deflected by the BD sensor 29 as a light detection element and the polygon mirror 25 on the left and right of the position outside the effective scanning range (scanning range actually used as the print width) R of the light beam L. A BD mirror 30 is disposed to return the light beam L1 traveling along the optical path deviating from the light path and guide it to the BD sensor 29.

而して、図２に示す光走査装置１０において、レーザーダイオード２２が画像信号に応じてＯＮ／ＯＦＦ制御されると、該レーザーダイオード２２から画像データに対応して変調された光ビームＬが出射され、この光ビームＬは、コリメータレンズ２３によって平行光束とされ、この平行光束Ｌは、副走査方向にのみパワーを有するシリンドリカルレンズ２４によってポリゴンミラー２５の反射面に結像され、高速で回転するポリゴンミラー２５によって偏向される。そして、偏向された光ビームＬは、ｆθレンズ２６，２７によって等速度で集光され、折り返しミラー２８によって折り返されて被走査面である感光ドラム４上に集光スポットを形成し、これによって感光ドラム４上が主走査方向に露光走査され、各感光ドラム４上には各色のカラー画像信号に応じた静電潜像が形成される。   Thus, in the optical scanning device 10 shown in FIG. 2, when the laser diode 22 is ON / OFF controlled according to the image signal, the light beam L modulated in accordance with the image data is emitted from the laser diode 22. The light beam L is converted into a parallel light beam by the collimator lens 23, and this parallel light beam L is imaged on the reflection surface of the polygon mirror 25 by the cylindrical lens 24 having power only in the sub-scanning direction, and rotates at high speed. It is deflected by the polygon mirror 25. The deflected light beam L is condensed at the same speed by the fθ lenses 26 and 27 and is folded by the folding mirror 28 to form a condensed spot on the photosensitive drum 4 which is the surface to be scanned. The drum 4 is exposed and scanned in the main scanning direction, and an electrostatic latent image corresponding to a color image signal of each color is formed on each photosensitive drum 4.

ここで、有効走査範囲Ｒ外に配置されたＢＤセンサー２９には光ビームＬ１がＢＤミラー３０によって折り返されて入射し、この光ビームＬ１がＢＤセンサー２９によって検知されることによって光ビームＬによる感光ドラム４上への露光走査（書き出し）開始タイミングが決定される。   Here, the light beam L1 is reflected by the BD mirror 30 and is incident on the BD sensor 29 arranged outside the effective scanning range R, and the light beam L1 is detected by the BD sensor 29, so that the light beam L1 is photosensitive. The timing for starting exposure scanning (writing) on the drum 4 is determined.

ところで、図３及び図４に示すように、ポリゴンミラー２５の垂直に起立する回転軸３１は、水平に配置された矩形平板状のポリゴン基板３２に内包されており、該ポリゴン基板３２は、図３に示す７つの締結点ａ〜ｇでピス３３によって筐体２１に取り付けられている。具体的には、ポリゴン基板３２の７つの締結点ａ〜ｇのうち、１つの締結点ｇはポリゴン基板３２の略中央に配置され、２つの締結点ｅ，ｆはポリゴンミラー２５を挟んで締結点ｇとは反対側のポリゴン基板３２の一方のコーナー部に配置されている。   As shown in FIGS. 3 and 4, the rotating shaft 31 that stands vertically of the polygon mirror 25 is included in a rectangular plate-shaped polygon substrate 32 that is horizontally arranged. 7 is attached to the housing 21 by a piss 33 at seven fastening points a to g. Specifically, among the seven fastening points a to g of the polygon substrate 32, one fastening point g is arranged at the approximate center of the polygon substrate 32, and the two fastening points e and f are fastened with the polygon mirror 25 interposed therebetween. It is arranged at one corner of the polygon substrate 32 on the side opposite to the point g.

他方、図４に示すように、筐体２１の締結点ａ〜ｇに対応する箇所には取付ボス２１ａ（図４には一部のみ図示）が一体に立設されており、これらの取付ボス２１ａの上にポリゴン基板３２がポリゴンミラー２５と共に載置され、該ポリゴン基板３２は、前述のように７つの締結点ａ〜ｇでビス３３によって筐体２１の取付ボス２１ａに取り付けられている。尚、図３において、３４はポリゴン基板３２上に設けられたコネクタである。   On the other hand, as shown in FIG. 4, mounting bosses 21 a (only a part of which is shown in FIG. 4) are erected integrally at locations corresponding to the fastening points a to g of the housing 21. A polygon substrate 32 is placed together with the polygon mirror 25 on 21a, and the polygon substrate 32 is attached to the attachment boss 21a of the housing 21 by the screws 33 at the seven fastening points a to g as described above. In FIG. 3, reference numeral 34 denotes a connector provided on the polygon substrate 32.

而して、本実施の形態では、図３に示すようにポリゴン基板３２の７つの締結点ａ〜ｇのうちの３つの締結点ｅ，ｆ，ｇを結んで形成される三角形の領域（図３に斜線を付した領域）の外側に制振ビス締結点Ｐが設けられており、筐体２１側の制振ビス締結点Ｐに対応する箇所には図４に示すように取付ボス２１ｂが一体に立設されている。そして、ポリゴン基板３２の制振ボス締結点Ｐにおいては、ビス３５が筐体２１側の取付ボス２１ｂに下方からねじ込まれ、該ビス３５の先端はポリゴン基板３２の下面に当接している。そして、ポリゴン基板３２の制振ビス締結点Ｐに下方から螺合挿通するビス３５の外周にはバネ３６が通され、このバネ３６はビス３５の頭部３５ａとポリゴン基板３２との間に縮装されている。   Thus, in the present embodiment, as shown in FIG. 3, a triangular region formed by connecting three fastening points e, f, and g among the seven fastening points a to g of the polygon substrate 32 (see FIG. 3 is provided with a damping screw fastening point P on the outside of the hatched area 3), and a mounting boss 21b is provided at a location corresponding to the damping screw fastening point P on the housing 21 side as shown in FIG. It is erected integrally. At the damping boss fastening point P of the polygon substrate 32, the screw 35 is screwed into the mounting boss 21 b on the housing 21 side from below, and the tip of the screw 35 is in contact with the lower surface of the polygon substrate 32. A spring 36 is passed through the outer periphery of a screw 35 that is screwed into the damping board fastening point P of the polygon board 32 from below, and the spring 36 is compressed between the head 35 a of the screw 35 and the polygon board 32. It is disguised.

以上のように、本発明に係る光走査装置１０においては、ポリゴン基板３２の３つの締結点ｅ，ｆ，ｇを結ンで形成される三角形の領域の外側に設けられた制振ビス締結点Ｐをこれに螺合挿通するビス３５の先端をポリゴン基板３２に押圧することによって、ポリゴン基板３２や筐体２１の固有振動数を共振周波数から遠ざけることができるため、部品の追加を要することなく筐体２１や折り返しミラー２８（図２参照）等の共振を抑制することができる。   As described above, in the optical scanning device 10 according to the present invention, the damping screw fastening point provided outside the triangular region formed by joining the three fastening points e, f, and g of the polygon substrate 32. The natural frequency of the polygon substrate 32 and the casing 21 can be kept away from the resonance frequency by pressing the tip of the screw 35 through which P is screwed into the polygon substrate 32, so that no additional parts are required. Resonance of the casing 21 and the folding mirror 28 (see FIG. 2) can be suppressed.

又、ビス３５の締付力を調整することによってポリゴン基板３２や筐体２１の固有振動数を調整することができるため、ポリゴンミラー２５を回転駆動する不図示のポリゴンモーターを異なる機種の光走査装置１０において複数の周波数で共通に使用しても、筐体２１や折り返しミラー２８等の共振を抑制することができる。特に、本実施の形態では、ビス３５を回転させてその移動量を調整することによってバネ３６によるポリゴン基板３２への押圧力が変化し、該ポリゴン基板３２の固有振動数が任意に調整されるため、ポリゴンモーターを異なる機種の光走査装置１０において複数の周波数で共通に使用することができる。   Further, since the natural frequency of the polygon substrate 32 and the casing 21 can be adjusted by adjusting the tightening force of the screw 35, a polygon motor (not shown) that rotates the polygon mirror 25 is used for optical scanning of different models. Even if the apparatus 10 is used in common at a plurality of frequencies, resonance of the casing 21 and the folding mirror 28 can be suppressed. In particular, in this embodiment, by adjusting the amount of movement by rotating the screw 35, the pressing force applied to the polygon substrate 32 by the spring 36 changes, and the natural frequency of the polygon substrate 32 is arbitrarily adjusted. Therefore, the polygon motor can be commonly used at a plurality of frequencies in different types of optical scanning devices 10.

そして、以上のように光走査装置１０の筐体２１や折り返しミラー等の共振が抑制されるため、図１に示す画像形成装置１においてジッター等の画像欠陥の無い高質画像を安定的に得ることができる。   Since the resonance of the casing 21 and the folding mirror of the optical scanning device 10 is suppressed as described above, a high-quality image free from image defects such as jitter can be stably obtained in the image forming apparatus 1 shown in FIG. be able to.

尚、以上は本発明をモノクロのレーザープリンターとこれに備えられた光走査装置に対して適用した形態について説明したが、本発明は、モノクロ、カラーを問わず、プリンター以外の他の任意の画像形成装置及びこれに備えられた光走査装置に対しても同様に適用可能であることは勿論である。   Although the present invention has been described with respect to a mode in which the present invention is applied to a monochromatic laser printer and an optical scanning device provided in the monochromatic laser printer, the present invention may be any image other than a printer, whether monochromatic or color. Of course, the present invention can be similarly applied to the forming apparatus and the optical scanning device provided therein.

１ 画像形成装置
１Ａ 画像形成装置本体
２ 画像形成部
３ 用紙収納部
４ 感光ドラム
５ 帯電器
６ 現像装置
７ 転写ローラー
８ クリーニング装置
９ トナーホッパー
１０ 光走査装置
１１，１２ 給紙カセット
１３ ピックローラー
１４ フィードローラー
１５ リタードローラー
１６ 排紙トレイ
１７ レジストローラー
１８ 定着装置
１８ａ 定着ローラー
１８ｂ 加圧ローラー
１９ 搬送ローラー
２０ 排紙ローラー
２１ 光走査装置の筐体
２１ａ 筐体の取付ボス
２１ｂ 筐体の取付ボス
２２ レーザーダイオード（光源）
２３ コリメータレンズ（光学素子）
２４ シリンドリカルレンズ（光学素子）
２５ ポリゴンミラー
２６，２７ ｆθレンズ
２８ 折り返しミラー
２９ ＢＤセンサー
３０ ＢＤミラー
３１ ポリゴンミラーの回転軸
３２ ポリゴン基板
３３ ビス
３４ コネクタ
３５ ビス
３５ａ ビスの頭部
３６ バネ
ａ〜ｇ ポリゴン基板の締結点
Ｐ ポリゴン基板の制振ビス締結点
Ｌ 光ビーム
Ｓ１ 第１搬送路
Ｓ２ 第２搬送路
DESCRIPTION OF SYMBOLS 1 Image forming apparatus 1A Image forming apparatus main body 2 Image forming part 3 Paper storage part 4 Photosensitive drum 5 Charging device 6 Developing device 7 Transfer roller 8 Cleaning device 9 Toner hopper 10 Optical scanning device 11, 12 Paper feed cassette 13 Pick roller 14 Feed Roller 15 Retard roller 16 Paper discharge tray 17 Registration roller 18 Fixing device 18a Fixing roller 18b Pressure roller 19 Transport roller 20 Paper discharge roller 21 Optical scanning device housing 21a Housing mounting boss 21b Housing mounting boss 22 Laser diode (light source)
23 Collimator lens (optical element)
24 Cylindrical lens (optical element)
25 polygon mirror 26, 27 fθ lens 28 folding mirror 29 BD sensor 30 BD mirror 31 rotation axis of polygon mirror 32 polygon substrate 33 screw 34 connector 35 screw 35a screw head 36 spring ag fastening point of polygon substrate P polygon substrate Damping screw fastening point L Light beam S1 First transport path S2 Second transport path

Claims (3)

光源から出射される光を光学素子を経てポリゴンミラーに入射させ、該ポリゴンミラーによって偏向された光を走査レンズによって結像させて像担持体を露光走査する光走査装置において、
前記ポリゴンミラーの回転軸を内包するポリゴン基板を複数の締結点において筐体に取り付け、前記複数の締結点のうちの３つの締結点を結んで形成される三角形の領域の外側に制振ビス締結点を設け、該制振ビス締結点に螺合挿通するビスによってポリゴン基板の制振ビス締結点を前記筐体に取り付けたことを特徴とする光走査装置。 In an optical scanning device that causes light emitted from a light source to enter a polygon mirror through an optical element, and that the light deflected by the polygon mirror is imaged by a scanning lens to expose and scan the image carrier.
A polygon substrate containing the rotation axis of the polygon mirror is attached to the housing at a plurality of fastening points, and a damping screw is fastened outside a triangular region formed by connecting three fastening points of the plurality of fastening points. An optical scanning device characterized in that a point is provided and a damping screw fastening point of a polygon substrate is attached to the housing by a screw threadably inserted into the damping screw fastening point. 前記ビスの頭部と前記ポリゴン基板との間にバネを縮装したことを特徴とする請求項１記載の光走査装置。   2. The optical scanning device according to claim 1, wherein a spring is mounted between the screw head and the polygon substrate. 請求項１又は２記載の光走査装置を備えることを特徴とする画像形成装置。
An image forming apparatus comprising the optical scanning device according to claim 1.
JP2011165338A 2011-07-28 2011-07-28 Optical scanning device and image forming apparatus having the same Expired - Fee Related JP5593282B2 (en)

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