JP5505753B2 - Curvature correction mechanism, optical scanning device, and image forming apparatus - Google Patents

Curvature correction mechanism, optical scanning device, and image forming apparatus Download PDF

Info

Publication number
JP5505753B2
JP5505753B2 JP2007321125A JP2007321125A JP5505753B2 JP 5505753 B2 JP5505753 B2 JP 5505753B2 JP 2007321125 A JP2007321125 A JP 2007321125A JP 2007321125 A JP2007321125 A JP 2007321125A JP 5505753 B2 JP5505753 B2 JP 5505753B2
Authority
JP
Japan
Prior art keywords
reflecting mirror
mirror
leaf spring
reflecting
light beam
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.)
Expired - Fee Related
Application number
JP2007321125A
Other languages
Japanese (ja)
Other versions
JP2009145495A (en
Inventor
敬一 芹沢
進 成田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2007321125A priority Critical patent/JP5505753B2/en
Publication of JP2009145495A publication Critical patent/JP2009145495A/en
Application granted granted Critical
Publication of JP5505753B2 publication Critical patent/JP5505753B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Laser Beam Printer (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Facsimile Scanning Arrangements (AREA)

Description

本発明は、複数の走査対象物をそれぞれ光走査する光走査装置の主走査線の湾曲を補正する湾曲補正機構、並びにこれを用いる光走査装置及び画像形成装置に関するものである。   The present invention relates to a curvature correction mechanism that corrects the curvature of a main scanning line of an optical scanning apparatus that optically scans a plurality of scanning objects, and an optical scanning apparatus and an image forming apparatus using the same.

従来、例えば特許文献1に記載の画像形成装置のように、いわゆるタンデム方式によって多色画像を形成するものが知られている。タンデム方式の画像形成装置は、感光体等の潜像担持体を複数有しており、それぞれの潜像担持体に対して光走査による潜像を形成する。そして、それら潜像を互いに異なる色のトナーで現像するなどして、それぞれの潜像担持体上で互いに異なる色の可視像を得る。次いで、それぞれの潜像担持体上の可視像を転写体に重ね合わせて転写することで、単色の可視像の重ね合わせによる多色画像を得る。   2. Description of the Related Art Conventionally, an apparatus that forms a multicolor image by a so-called tandem method, such as an image forming apparatus described in Patent Document 1, is known. The tandem image forming apparatus has a plurality of latent image carriers such as photoconductors, and forms latent images by optical scanning on each latent image carrier. Then, the latent images are developed with different color toners to obtain visible images of different colors on the respective latent image carriers. Next, a visible image on each latent image carrier is transferred onto the transfer body so as to obtain a multicolor image by superimposing single-color visible images.

かかる構成では、複数の潜像担持体上で可視像がそれぞれ互いに相対的に位置ずれして形成されると、それらが位置ずれした状態で転写体に転写されることで多色画像に色ずれを引き起こす。この色ずれの原因の1つとして、潜像担持体の表面上における主走査方向の走査線(以下、主走査線という)の湾曲が挙げられる。具体的には、潜像担持体を光走査する光走査装置では、それを構成する光学系部品や支持体等に、製造時の加工誤差などによる微妙な歪みがどうしても発生する。また、モータの発熱を伴う光走査動作中には、光学系部品や支持体の微妙な熱変形が生ずる。更には、光学系部品や支持体には組付誤差が少なからず発生する。これら歪み、熱変形、組付誤差などにより、潜像担持体の表面上の主走査線が湾曲してしまうのである。   In such a configuration, when the visible images are formed on the plurality of latent image carriers so as to be displaced relative to each other, they are transferred to the transfer member in a state of being displaced so that a color image is formed on the multicolor image. Cause a gap. One cause of this color misregistration is the curvature of scanning lines in the main scanning direction (hereinafter referred to as main scanning lines) on the surface of the latent image carrier. Specifically, in an optical scanning device that optically scans a latent image carrier, subtle distortions due to processing errors during manufacturing are inevitably generated in the optical system components and supports constituting the latent image carrier. Further, during the optical scanning operation accompanied by the heat generation of the motor, subtle thermal deformation of the optical system parts and the support occurs. Furthermore, there are not a few assembly errors in optical system parts and supports. The main scanning line on the surface of the latent image carrier is curved due to such distortion, thermal deformation, assembly error, and the like.

図15は、潜像担持体たるドラム状の感光体10と、その表面上における主走査線とを示す斜視図である。同図において、Laという符号が付された点線は、理想的な状態の主走査線を示しており、これは主走査方向(感光体軸線方向)に沿って一直線状に延在している。これに対し、Lbという符号が付された実線や、Lcという符号が付された一点鎖線は、それぞれ図示のように湾曲している状態の主走査線を示している。これら2つの主走査線のうち、一方の主走査線Lbは、主走査方向の中央部を両端部よりも副走査方向(感光体表面移動方向)の下流側に突出させる方向に湾曲している。また、他方の主走査線Lcは、主走査方向の中央部を両端部よりも副走査方向の上流側に突出させる方向に湾曲している。何れの方向に湾曲するのかは、個々の製品によって異なってくる。その湾曲は、様々な部品の歪み、熱変形、組付誤差などの交差が積み重なったものだからである。また、タンデム方式では、上述のように複数の感光体を用いるが、それぞれの感光体上における主走査線の湾曲方向も、製品毎に異なってくる。   FIG. 15 is a perspective view showing the drum-shaped photoconductor 10 serving as a latent image carrier and main scanning lines on the surface thereof. In the figure, a dotted line labeled with La indicates a main scanning line in an ideal state, which extends in a straight line along the main scanning direction (photosensitive member axial direction). On the other hand, the solid line with the symbol Lb and the alternate long and short dash line with the symbol Lc indicate the main scanning lines in a curved state as shown in the figure. Of these two main scanning lines, one main scanning line Lb is curved in a direction in which the central portion in the main scanning direction protrudes downstream from the both end portions in the sub-scanning direction (photoconductor surface movement direction). . The other main scanning line Lc is curved in a direction in which the central portion in the main scanning direction protrudes to the upstream side in the sub-scanning direction from both ends. Which direction the curve is made depends on the individual product. This is because the intersections of various parts such as distortion, thermal deformation, and assembly error are accumulated. In the tandem method, a plurality of photoconductors are used as described above, but the bending direction of the main scanning line on each photoconductor also varies from product to product.

複数の感光体の間で、主走査線の湾曲方向が異なると、可視像の相対的な位置ズレ量が大きくなるため、画像を乱すほどの色ずれとなって現れてしまう。このため、多色画像の色ずれを軽減するためには、複数の感光体に対する主走査線がそれぞれどちらの方向に湾曲していても、その湾曲を補正できるようにする必要がある。   If the bending direction of the main scanning line is different among a plurality of photoconductors, the relative positional shift amount of the visible image is increased, so that a color shift that disturbs the image appears. For this reason, in order to reduce the color misregistration of a multicolor image, it is necessary to be able to correct the curvature regardless of which direction the main scanning lines for the plurality of photoconductors are curved.

特開2003−182146号公報JP 2003-182146 A

そこで、本発明者は、走査光学系の反射鏡を湾曲させながらその湾曲量を調整することで、感光体上における主走査線の湾曲を補正する湾曲補正機構を設けた光書込装置を開発中である。
図16は、この開発中の光書込装置における反射鏡46と、その周囲構成とを示す拡大構成図である。図17は、開発中の光書込装置における反射鏡46を長手方向の一端側から示す側面図である。反射鏡46は、図示しない書込用の光ビームを複数回に渡って折返し反射させることで最終的に図示しない感光体に導く複数の反射鏡の1つである。反射鏡46は、その裏面(非鏡面)側に配設されたホルダー52によって保持されている。
ホルダー52の長手方向の両端部には、それぞれ反射鏡46に向けて突出する支持手段たる支持突起52aが設けられており、支持突起52aが反射鏡46の裏面に当接している。ホルダー52の端部の支持突起52aよりも長手方向の中央側には、押圧部材たる板バネ部材54が取り付けられている。板バネ部材54は、ホルダー52の反射鏡46の裏面と対向する面の反対側の面と面接触する固定部たる固定面54aと、この固定面54aの両端からそれぞれ反射鏡面側へ延びるアーム部54と、アーム部54の先端に設けられた押圧部たる板バネ部54とで構成されている。それぞれの板バネ部54は、反射鏡46を鏡面側から裏面側に向けて押圧している。これにより、反射鏡46とホルダー52とが、板バネ部材54の板バネ部54と固定面54aとで狭持され、反射鏡46がホルダー52に保持される。また、ホルダー52の支持突起52aよりも中央側の位置で板バネ部54が反射鏡46を押圧するので、反射鏡46は、長手方向の中央部を鏡面側から裏面側に向けて撓ませるような形状で湾曲する。つまり、反射鏡46は、板バネ部材54によって強制的に湾曲させた状態でホルダー52に保持される。
Therefore, the present inventor has developed an optical writing device provided with a curvature correction mechanism for correcting the curvature of the main scanning line on the photosensitive member by adjusting the amount of curvature while bending the reflecting mirror of the scanning optical system. It is in.
FIG. 16 is an enlarged configuration diagram showing the reflecting mirror 46 and its surrounding configuration in the optical writing device under development. FIG. 17 is a side view showing the reflecting mirror 46 in the optical writing apparatus under development from one end side in the longitudinal direction. The reflecting mirror 46 is one of a plurality of reflecting mirrors that finally guides a writing light beam (not shown) to a photosensitive member (not shown) by reflecting back and forth over a plurality of times. The reflecting mirror 46 is held by a holder 52 disposed on the back surface (non-mirror surface) side thereof.
At both ends in the longitudinal direction of the holder 52, support protrusions 52a as support means protruding toward the reflecting mirror 46 are provided, and the supporting protrusions 52a are in contact with the back surface of the reflecting mirror 46. A leaf spring member 54 serving as a pressing member is attached to the center side in the longitudinal direction from the support protrusion 52 a at the end of the holder 52. The leaf spring member 54 includes a fixed surface 54a that is a fixed portion that is in surface contact with a surface opposite to the surface opposite to the back surface of the reflecting mirror 46 of the holder 52, and an arm portion that extends from both ends of the fixed surface 54a toward the reflecting mirror surface. 54 b and a leaf spring portion 54 c which is a pressing portion provided at the tip of the arm portion 54 b . Each leaf spring portion 54 c is pressed toward the rear side from the mirror side reflector 46. As a result, the reflecting mirror 46 and the holder 52 are held between the leaf spring portion 54 c and the fixing surface 54 a of the leaf spring member 54, and the reflecting mirror 46 is held by the holder 52. Further, since the plate spring portion 54 c at a position on the center side than the support projections 52a of the holder 52 presses the reflecting mirror 46, the reflecting mirror 46 deflects toward the back side from the mirror surface side central portion in the longitudinal direction Curved in such a shape. That is, the reflecting mirror 46 is held by the holder 52 in a state in which the reflecting mirror 46 is forcibly bent by the leaf spring member 54.

このように反射鏡46を強制的に湾曲させた状態から、反射鏡46を押込装置200によって板バネ部材54の押圧方向と逆方向に押し込むと、反射鏡46の湾曲量が減少する。反射鏡46を押込装置200によって更に押し込むと、反射鏡46が初期の状態とは逆方向に湾曲する。このように、反射鏡46を裏面側、鏡面側の何れの方向にも湾曲できるようにすることで、図15で実線で示した主走査線Lb、1点鎖線で示した主走査線Lcの何れの湾曲も補正することができる。   When the reflecting mirror 46 is forcedly bent in this way and is pushed in the direction opposite to the pressing direction of the leaf spring member 54 by the pushing device 200, the bending amount of the reflecting mirror 46 decreases. When the reflecting mirror 46 is further pushed in by the pushing device 200, the reflecting mirror 46 is bent in the direction opposite to the initial state. Thus, by allowing the reflecting mirror 46 to bend in any direction on the back surface side and the mirror surface side, the main scanning line Lb indicated by a solid line in FIG. Any curvature can be corrected.

この開発中の光書込装置において、次のような課題が残っていた。すなわち、押圧部材たる板バネ部材54の寸法公差などにより、アーム部54cの先端である押圧部たる板バネ部54cの支点Qの位置が変動してしまう。板バネ部54cの支点Qの位置が反射鏡46の鏡面に対して離れる方向に変動すると、板バネ部54cの反射鏡46を押圧する力が弱くなり、反射鏡46を十分に強制的に湾曲することができず、図15で実線で示した主走査線Lb、1点鎖線で示した主走査線Lc何れか一方の湾曲が補正できなくなるおそれがあった。また、押圧力が低下する結果、反射鏡46がホルダー52から脱落してしまうおそれもある。このため、板バネ部54cの支点Qの位置が反射鏡46の鏡面に対して離れる方向に公差変動しても、所定の押圧力が得られるように、板バネ部54cの長さを長くしたり、板バネ部54cとアーム部54bとの角度をより鋭角にしたりしていた。しかしながら、板バネ部54cの支点Qの位置が反射鏡46の鏡面に対して近づいた方向に変動すると、板バネ部54cの鏡面を押圧する力が大きくなりすぎてしまう。その結果、湾曲補正後の主走査線の形状が放物線を描かず、図18に示すように、板バネ部54cの押圧位置を中心にして湾曲して、波打ってしまい、湾曲補正後も色ずれが残ってしまうという問題があった。   In the optical writing device under development, the following problems remain. That is, the position of the fulcrum Q of the leaf spring portion 54c, which is the pressing portion, which is the tip of the arm portion 54c, varies due to the dimensional tolerance of the leaf spring member 54, which is the pressing member. If the position of the fulcrum Q of the leaf spring portion 54c changes in a direction away from the mirror surface of the reflecting mirror 46, the force of pressing the reflecting mirror 46 of the leaf spring portion 54c becomes weak, and the reflecting mirror 46 is sufficiently forced to bend. There is a possibility that the curvature of either the main scanning line Lb indicated by the solid line in FIG. 15 or the main scanning line Lc indicated by the one-dot chain line cannot be corrected. Further, as a result of the reduction of the pressing force, the reflecting mirror 46 may fall off the holder 52. For this reason, the length of the leaf spring portion 54c is increased so that a predetermined pressing force can be obtained even when the position of the fulcrum Q of the leaf spring portion 54c fluctuates in the direction away from the mirror surface of the reflecting mirror 46. Or the angle between the leaf spring portion 54c and the arm portion 54b is made more acute. However, if the position of the fulcrum Q of the leaf spring portion 54c fluctuates in the direction approaching the mirror surface of the reflecting mirror 46, the force that presses the mirror surface of the leaf spring portion 54c becomes too large. As a result, the shape of the main scanning line after the curvature correction does not draw a parabola, and as shown in FIG. 18, the main scanning line is curved around the pressing position of the leaf spring portion 54 c and undulates. There was a problem that the gap remained.

本発明は、上記問題に鑑みなされたものであり、その目的とするところは、押圧部材の公差変動による押圧部材の押圧力の変動を抑制することのできる湾曲補正機構、並びにこれを用いる光走査装置及び画像形成装置を提供することである。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a curvature correction mechanism capable of suppressing fluctuations in the pressing force of the pressing member due to fluctuations in the tolerances of the pressing member, and optical scanning using the same. An apparatus and an image forming apparatus are provided.

上記目的を達成するために、請求項1の発明は、光ビーム発射手段と、前記光ビーム発射手段から発射された光ビームを主走査方向に偏向せしめる偏向手段と、前記光ビームを反射させる反射鏡とを有し、前記光ビームによって走査対象物を光走査する光走査装置に用いられ、前記反射鏡の長手方向の両端部でそれぞれ、前記反射鏡の裏面に当接して前記反射鏡を支持する支持手段と、前記反射鏡の長手方向において前記支持手段の支持位置と異なる位置で前記反射鏡の鏡面を前記鏡面と直交する方向に押圧して、前記反射鏡を強制的に湾曲させる押圧部材と、前記反射鏡を鏡面と直交する方向に押し込むことで前記押圧部材による反射鏡の強制湾曲方向とは逆方向への湾曲させる押込手段とを具備し、前記押込手段による押込量の調整によって前記走査対象物表面上での主走査線の湾曲を補正する湾曲補正機構において、前記反射鏡の長手方向の両端部にそれぞれ前記支持手段を備え、前記反射鏡の鏡面と直交するある一方向に切った断面形状がコの字形状であって、前記反射鏡の裏面と前記反射鏡の長手方向および前記鏡面と直交する方向に平行な面とに内面が対向する部分を有し、前記コの字形状の各先端から前記鏡面に対して平行に延在し前記押圧部材が固定される押圧部材固定部を、前記長手方向両端部でかつ前記支持手段よりも中央側にそれぞれ設け、前記支持部材よりも中央側で前記押圧部材によって前記鏡面を押圧することで、前記反射鏡を強制的に湾曲させた状態で保持するホルダを備え、前記押圧部材は、前記押圧部材固定部に当接する固定部と、前記鏡面に当接して前記鏡面を押圧する押圧部とを有する断面V字状の板バネ部材であり、前記板バネ部材は、前記長手方向中央側に向かうに連れて、固定部と押圧部との開きが大きくなるような向きで、前記押圧部材固定部に固定され、前記板バネ部材の固定部に前記押圧部の押圧方向と逆方向の変位を規制する規制部を設けたことを特徴とするものである。
また、請求項2の発明は、光ビーム発射手段と、前記光ビーム発射手段から発射された光ビームを主走査方向に偏向せしめる偏向手段と、前記光ビームを反射させる反射鏡と、走査対象物の表面上における主走査線の湾曲を補正する湾曲補正手段とを備え、前記光ビームによって前記走査対象物を光走査する光走査装置において、前記湾曲補正手段として、請求項1の湾曲補正機構を用いたことを特徴とするものである。
また、請求項3の発明は、請求項2の光走査装置において、前記反射鏡の姿勢を変化させて前記走査対象物の表面上における主走査線の傾きを調整する傾き調整手段を備えたことを特徴とするものである。
また、請求項4の発明は、潜像を担持する潜像担持体と、光走査によって前記潜像担持体の表面に潜像を形成する光走査手段と、前記潜像担持体に担持された潜像を現像する現像手段とを備える画像形成装置において、前記光走査手段として、請求項2または3の光走査装置を用いたことを特徴とするものである。
To achieve the above object, the invention of claim 1 is directed to a light beam emitting means, a deflecting means for deflecting the light beam emitted from the light beam emitting means in a main scanning direction, and a reflection for reflecting the light beam. And is used in an optical scanning device that optically scans an object to be scanned with the light beam, and supports the reflecting mirror by abutting against the back surface of the reflecting mirror at both ends in the longitudinal direction of the reflecting mirror. supporting means for, by pressing the mirror before Symbol reflector in a direction perpendicular to the mirror surface at the support position different from the position of the supporting means in the longitudinal direction of the reflector, pressed forcibly bend the reflection mirror A member and a pushing means for bending the reflecting mirror in a direction opposite to the forcible bending direction of the reflecting mirror by pushing the reflecting mirror in a direction perpendicular to the mirror surface, for adjusting the pushing amount by the pushing means Yo In the curvature correction mechanism for correcting the curvature of the main scanning line on the surface of the scanning object, the support means is provided at both ends in the longitudinal direction of the reflecting mirror, and the direction is perpendicular to the mirror surface of the reflecting mirror. The cross-sectional shape is a U-shaped cross section, and the inner surface is opposed to a back surface of the reflecting mirror and a surface parallel to a longitudinal direction of the reflecting mirror and a direction orthogonal to the mirror surface. A pressing member fixing portion that extends in parallel with the mirror surface from each tip of the U-shape and that fixes the pressing member is provided at both ends in the longitudinal direction and on the center side of the support means, and the support A holder that holds the reflecting mirror in a state of being forcedly curved by pressing the mirror surface with the pressing member at a center side of the member is provided, and the pressing member is fixed in contact with the pressing member fixing portion. And the mirror surface A V-shaped leaf spring member having a pressing portion for pressing the mirror surface in contact, the plate spring member, as the towards the longitudinal center side, a large opening between the fixed portion and the pressing portion In such a direction, a fixing portion is provided that is fixed to the pressing member fixing portion and that restricts displacement in the direction opposite to the pressing direction of the pressing portion in the fixing portion of the leaf spring member. .
According to a second aspect of the present invention, there is provided a light beam emitting means, a deflecting means for deflecting the light beam emitted from the light beam emitting means in a main scanning direction, a reflecting mirror for reflecting the light beam, and a scanning object. And a curvature correcting unit that corrects the curvature of the main scanning line on the surface of the optical scanning device. The optical scanning device that optically scans the scanning object with the light beam includes the curvature correcting mechanism according to claim 1 as the curvature correcting unit. It is characterized by being used.
According to a third aspect of the present invention, there is provided the optical scanning device according to the second aspect, further comprising an inclination adjusting means for adjusting an inclination of a main scanning line on the surface of the scanning object by changing an attitude of the reflecting mirror. It is characterized by.
According to a fourth aspect of the present invention, there is provided a latent image carrier that carries a latent image, optical scanning means that forms a latent image on the surface of the latent image carrier by optical scanning, and the latent image carrier. An image forming apparatus including a developing unit that develops a latent image uses the optical scanning device according to claim 2 or 3 as the optical scanning unit.

本発明によれば、押圧部材が固定される押圧部材固定手段を、反射鏡の鏡面側に設けることによって、押圧部材の反射鏡の鏡面を押圧する押圧部と、押圧部材固定手段に固定される固定部とを直接連結することが可能となる。よって、押圧部材固定手段を、反射鏡の裏面側に設けたもののように、押圧部と固定部とを連結するためのアーム部を不要にすることができる。これにより、押圧部の支点の位置が、押圧部材の寸法公差によって変動することが抑制される。よって、押圧部材の公差変動による押圧力の変動を抑制することができ、押圧部材の押圧力を高めに設定しなくても、反射鏡を強制的に湾曲させることができる。 According to the onset bright, the pressing member fixing means is pressing member is fixed, by providing a mirror surface side of the reflecting mirror, and the pressing part for pressing the mirror surface of the reflector of the pressing member is fixed to the pressing member fixing means It is possible to directly connect the fixed part. Therefore, it is possible to eliminate the need for an arm portion for connecting the pressing portion and the fixing portion, such as the pressing member fixing means provided on the back side of the reflecting mirror. Thereby, it is suppressed that the position of the fulcrum of the pressing portion varies due to the dimensional tolerance of the pressing member. Therefore, the fluctuation of the pressing force due to the tolerance fluctuation of the pressing member can be suppressed, and the reflecting mirror can be forcibly bent without setting the pressing force of the pressing member high.

以下、本発明を、電子写真方式のカラーレーザープリンタ(以下、単にプリンタという)に適用した実施形態について説明する。
図1は、本実施形態に係るプリンタを示す概略構成図である。このプリンタは、筐体1と、この筐体1から引き出し可能な給紙カセット2とを備えている。筐体1の中央部には、イエロー(Y)、シアン(C)、マゼンダ(M)、黒(K)の各色のトナー像(可視像)を形成するための作像ステーション3Y,3C,3M,3Kを備えている。以下、各符号の添字Y、C、M、Kは、それぞれイエロー、シアン、マゼンダ、黒用の部材であることを示す。
Hereinafter, an embodiment in which the present invention is applied to an electrophotographic color laser printer (hereinafter simply referred to as a printer) will be described.
FIG. 1 is a schematic configuration diagram illustrating a printer according to the present embodiment. The printer includes a housing 1 and a paper feed cassette 2 that can be pulled out from the housing 1. Image forming stations 3Y, 3C, and 3C for forming toner images (visible images) of each color of yellow (Y), cyan (C), magenta (M), and black (K) are provided at the center of the housing 1. 3M, 3K. Hereinafter, the subscripts Y, C, M, and K of the respective symbols indicate members for yellow, cyan, magenta, and black, respectively.

図2は、イエロー(Y)用の作像ステーションを示す概略構成図である。なお、他の作像ステーションも同様の構成である。
図1及び図2に示すように、作像ステーション3Y,3C,3M,3Kは、図中矢印A方向に回転する潜像担持体としてのドラム状の感光体10Y,10C,10M,10Kを備えている。感光体10Y,10C,10M,10Kは、直径40[mm]のアルミニウム製の円筒状基体と、その表面を覆う、例えばOPC(有機光半導体)感光層とから構成されている。各作像ステーション3Y,3C,3M,3Kは、それぞれ、感光体10Y,10C,10M,10Kの周囲に、感光体を帯電する帯電装置11Y,11C,11M,11Kを備えている。また、感光体に形成された潜像を現像する現像手段としての現像装置12Y,12C,12M,12K、感光体上の残留トナーをクリーニングするクリーニング装置13Y,13C,13M,13Kも感光体の周囲に備えている。
FIG. 2 is a schematic configuration diagram showing an image forming station for yellow (Y). The other image forming stations have the same configuration.
As shown in FIGS. 1 and 2, the image forming stations 3Y, 3C, 3M, and 3K include drum-shaped photoconductors 10Y, 10C, 10M, and 10K as latent image carriers that rotate in the direction of arrow A in the drawing. ing. Each of the photoreceptors 10Y, 10C, 10M, and 10K includes an aluminum cylindrical substrate having a diameter of 40 [mm] and an OPC (organic photo semiconductor) photosensitive layer that covers the surface of the photoreceptor. Each of the image forming stations 3Y, 3C, 3M, and 3K includes charging devices 11Y, 11C, 11M, and 11K that charge the photoconductors around the photoconductors 10Y, 10C, 10M, and 10K, respectively. Further, developing devices 12Y, 12C, 12M, and 12K as developing means for developing the latent image formed on the photosensitive member, and cleaning devices 13Y, 13C, 13M, and 13K for cleaning residual toner on the photosensitive member are also provided around the photosensitive member. In preparation.

各作像ステーション3Y,3C,3M,3Kの下方には、感光体10Y,10C,10M,10Kに対し、書込光Lによる光走査を行う光走査装置としての光書込ユニット4を備えている。また、各作像ステーション3Y,3C,3M,3Kの上方には、各作像ステーション3Y,3C,3M,3Kによって形成されたトナー像が転写される中間転写ベルト20を具備する中間転写ユニット5を備えている。また、中間転写ベルト20に転写されたトナー像を転写体としての記録紙Pに定着せしめる定着ユニット6を備えている。また、筐体1の上部には、イエロー(Y)、シアン(C)、マゼンタ(M)、黒(K)の各色のトナーを収容するトナーボトル7Y,7C,7M,7Kが装填されている。このトナーボトル7Y,7C,7M,7Kは、筐体1の上部に形成される排紙トレイ8を開くことにより、筐体1から脱着可能になっている。   Below each of the image forming stations 3Y, 3C, 3M, and 3K, there is provided an optical writing unit 4 as an optical scanning device that performs optical scanning with the writing light L on the photoreceptors 10Y, 10C, 10M, and 10K. Yes. Further, an intermediate transfer unit 5 including an intermediate transfer belt 20 to which toner images formed by the image forming stations 3Y, 3C, 3M, and 3K are transferred above the image forming stations 3Y, 3C, 3M, and 3K. It has. Further, a fixing unit 6 is provided for fixing the toner image transferred to the intermediate transfer belt 20 onto a recording paper P as a transfer member. In addition, toner bottles 7Y, 7C, 7M, and 7K that contain toner of each color of yellow (Y), cyan (C), magenta (M), and black (K) are loaded on the top of the casing 1. . The toner bottles 7 </ b> Y, 7 </ b> C, 7 </ b> M, and 7 </ b> K can be detached from the housing 1 by opening a paper discharge tray 8 formed on the top of the housing 1.

光走査装置としての光書込ユニット4は、光ビーム発射手段であるレーザーダイオードを有しており、このレーザーダイオードから、回転駆動される正多角柱構造のポリゴンミラーに向けて光ビームとしての書込光Lを発射する。発射された書込光Lは、回転するポリゴンミラーの鏡面によって主走査方向に偏向せしめられながら反射する。そして、複数の反射鏡によって折り返された後、帯電装置11Y,11C,11M,11Kによって一様帯電せしめられた感光体10Y,10C,10M,10Kの周面を走査する。これにより、潜像担持体としての感光体10Y,10C,10M,10Kの周面に、それぞれY,C,M,K用の静電潜像が形成される。なお、光書込ユニット4の詳しい説明は後述する。   The optical writing unit 4 as an optical scanning device has a laser diode which is a light beam emitting means, and a writing as a light beam is directed from this laser diode toward a polygon mirror having a regular polygonal column structure which is driven to rotate. Fire the incoming light L. The emitted writing light L is reflected while being deflected in the main scanning direction by the mirror surface of the rotating polygon mirror. Then, after being folded by a plurality of reflecting mirrors, the peripheral surfaces of the photoreceptors 10Y, 10C, 10M, and 10K that are uniformly charged by the charging devices 11Y, 11C, 11M, and 11K are scanned. Thereby, electrostatic latent images for Y, C, M, and K are formed on the peripheral surfaces of the photoreceptors 10Y, 10C, 10M, and 10K as latent image carriers. The detailed description of the optical writing unit 4 will be described later.

転写手段たる中間転写ユニット5の中間転写ベルト20は、駆動ローラ21、テンションローラ22及び従動ローラ23に掛け回されながら、所定タイミングで図中反時計回り方向に回転駆動される。また、中間転写ユニット5は、感光体10Y,10C,10M,10Kに形成されたトナー像を中間転写ベルト20に1次転写する1次転写ローラ24Y,24C,24M,24Kを備えている。また、中間転写ベルト20上に1次転写されたトナー像を記録紙Pに転写する2次転写ローラ25、記録紙P上に転写されなかった中間転写ベルト20上の転写残トナーをクリーニングするベルトクリーニング装置26も備えている。   The intermediate transfer belt 20 of the intermediate transfer unit 5 serving as transfer means is driven to rotate counterclockwise in the figure at a predetermined timing while being wound around a drive roller 21, a tension roller 22 and a driven roller 23. In addition, the intermediate transfer unit 5 includes primary transfer rollers 24Y, 24C, 24M, and 24K that primarily transfer the toner images formed on the photoreceptors 10Y, 10C, 10M, and 10K to the intermediate transfer belt 20. Further, a secondary transfer roller 25 that transfers the toner image primarily transferred onto the intermediate transfer belt 20 to the recording paper P, and a belt that cleans residual toner on the intermediate transfer belt 20 that has not been transferred onto the recording paper P. A cleaning device 26 is also provided.

次に、本プリンタにおいて、カラー画像を得る工程について説明する。
まず、作像ステーション3Y,3C,3M,3Kにおいて、感光体10Y,10C,10M,10Kが帯電装置11Y,11C,11M,11Kによって一様に帯電される。その後、画像情報に基づいて生成された書込光Lによって走査露光されて、感光体10Y,10C,10M,10Kの表面に静電潜像が形成される。これらの静電潜像は、現像装置12Y,12C,12M,12Kの現像ローラ15Y,15C,15M,15K上に担持された各色のトナーによって現像されて、Y,C,M,Kトナー像となる。感光体10Y,10C,10M,10K上のY,C,M,Kトナー像は、各1次転写ローラ24Y,24C,24M,24Kの作用によって反時計回りに回転駆動する中間転写ベルト20上に順次重ねて1次転写される。このときの各色の作像動作は、そのトナー像が中間転写ベルト20上の同じ位置に重ねて転写されるように、中間転写ベルト20の移動方向上流側から下流側に向けてタイミングをずらして実行される。
Next, a process for obtaining a color image in this printer will be described.
First, in the image forming stations 3Y, 3C, 3M, and 3K, the photoreceptors 10Y, 10C, 10M, and 10K are uniformly charged by the charging devices 11Y, 11C, 11M, and 11K. Thereafter, scanning exposure is performed with the writing light L generated based on the image information, and electrostatic latent images are formed on the surfaces of the photoreceptors 10Y, 10C, 10M, and 10K. These electrostatic latent images are developed with toners of the respective colors carried on the developing rollers 15Y, 15C, 15M, and 15K of the developing devices 12Y, 12C, 12M, and 12K, and are converted into Y, C, M, and K toner images. Become. The Y, C, M, and K toner images on the photoreceptors 10Y, 10C, 10M, and 10K are formed on the intermediate transfer belt 20 that is rotated counterclockwise by the action of the primary transfer rollers 24Y, 24C, 24M, and 24K. The primary transfer is carried out in order. The image forming operation of each color at this time is shifted in timing from the upstream side in the moving direction of the intermediate transfer belt 20 toward the downstream side so that the toner image is transferred to the same position on the intermediate transfer belt 20. Executed.

1次転写終了後の感光体10Y,10C,10M,10Kは、クリーニング装置13Y,13C,13M,13Kのクリーニングブレード13aによってその表面がクリーニングされて、次の画像形成に備えられる。   The surfaces of the photoconductors 10Y, 10C, 10M, and 10K after the completion of the primary transfer are cleaned by the cleaning blades 13a of the cleaning devices 13Y, 13C, 13M, and 13K to prepare for the next image formation.

トナーボトル7Y,7C,7M,7Kに充填されているトナーは、必要性に応じて図示しない搬送経路によって各作像ステーション3Y,3C,3M,3Kの現像装置12Y,12C,12M,12Kに所定量補給される。   The toner filled in the toner bottles 7Y, 7C, 7M, and 7K is placed in the developing devices 12Y, 12C, 12M, and 12K of the image forming stations 3Y, 3C, 3M, and 3K by a conveyance path (not shown) as necessary. A fixed amount is supplied.

一方、上記給紙カセット2内の記録紙Pは、給紙カセット2の近傍に配設された給紙ローラ27によって、筐体1内に搬送され、レジストローラ対28によって所定のタイミングで2次転写部に搬送される。そして、2次転写部において、中間転写ベルト20上に形成されたトナー像が記録紙Pに転写される。トナー像が転写された記録紙Pは、定着ユニット6を通過することでトナー像が定着せしめられた後、排出ローラ29によって排紙トレイ8に排出される。感光体10と同様に、中間転写ベルト20上に残った転写残のトナーは、中間転写ベルト20に接触するベルトクリーニング装置26によってクリーニングされる。   On the other hand, the recording paper P in the paper feed cassette 2 is transported into the housing 1 by a paper feed roller 27 disposed in the vicinity of the paper feed cassette 2 and is secondary by a registration roller pair 28 at a predetermined timing. It is conveyed to the transfer unit. Then, the toner image formed on the intermediate transfer belt 20 is transferred to the recording paper P in the secondary transfer portion. The recording paper P onto which the toner image has been transferred passes through the fixing unit 6 to fix the toner image, and is then discharged to the paper discharge tray 8 by the discharge roller 29. Similar to the photoconductor 10, the transfer residual toner remaining on the intermediate transfer belt 20 is cleaned by a belt cleaning device 26 that contacts the intermediate transfer belt 20.

次に、光書込ユニット4の構成について説明する。
図3は、本実施形態に係るプリンタおける光書込ユニット4を、4つの感光体とともに示す概略構成図である。この光書込ユニット4は、正多角柱構造の形状からなる2つのポリゴンミラー41a,41bを備えている。これらポリゴンミラー41a,41bは、その6つの側面に反射鏡を有しており、互いに正多角柱の中心を重ねるようにして上下方向に接続されている。そして、図示しないポリゴンモータによって同一回転軸線上で高速回転する。これにより、その側面にレーザーダイオード(光ビーム発射手段)からの書込光(光ビーム)が入射すると、この書込光が偏向・走査される。なお、ポリゴンミラー41aは、それに対して互いに反対方向から進んでくるC,M用の書込光Lc,Lmを主走査方向に偏向せしめるものである。また、ポリゴンミラー41bは、それに対して互いに反対方向から進んでくるY,K用の書込光Ly,Lkを主走査方向に偏向せしめるものである。
Next, the configuration of the optical writing unit 4 will be described.
FIG. 3 is a schematic configuration diagram showing the optical writing unit 4 in the printer according to this embodiment together with four photosensitive members. The optical writing unit 4 includes two polygon mirrors 41a and 41b having a regular polygonal column structure. These polygon mirrors 41a and 41b have reflecting mirrors on their six side surfaces, and are connected in the vertical direction so that the centers of the regular polygonal columns overlap each other. And it rotates at high speed on the same axis of rotation by a polygon motor (not shown). Thus, when the writing light (light beam) from the laser diode (light beam emitting means) is incident on the side surface, the writing light is deflected and scanned. The polygon mirror 41a deflects the C and M writing lights Lc and Lm traveling from opposite directions to the main scanning direction. The polygon mirror 41b deflects Y and K writing lights Ly and Lk traveling in opposite directions to the main scanning direction.

図示の光書込ユニット4においては、ポリゴンミラー41a,41bや図示しないポリゴンモータ等により、光ビームとしての書込光Lを偏向せしめる偏向手段が構成されている。光書込ユニット4は、かかる偏向手段の他、4つの反射光学系、防音ガラス42a,42b、走査レンズ43a,43b、防塵ガラス48a,48b,48c,48dなども有している。   In the illustrated optical writing unit 4, deflecting means for deflecting the writing light L as a light beam is configured by polygon mirrors 41 a and 41 b, a polygon motor (not shown), and the like. The optical writing unit 4 has four deflecting optical systems, soundproof glasses 42a and 42b, scanning lenses 43a and 43b, dustproof glasses 48a, 48b, 48c, and 48d in addition to the deflecting means.

ポリゴンモータやポリゴンミラー41a,41bは、防音のためにポリゴンカバー部材によって覆われている。このポリゴンカバー部材の内外で書込光を通過させる目的から、ポリゴンカバーには、防音ガラス42a,42bが設けられている。光ビームとしての書込光は、この防音ガラス42a,42bを透過することで、ポリゴンカバーの内外を行き来することが可能になっている。なお、防音ガラス42aは、Y,C用の書込光Ly,Lcを透過させるためのものである。また、防音ガラス42bは、M,K用の書込光Lm,Lkを透過させるためのものである。   The polygon motor and the polygon mirrors 41a and 41b are covered with a polygon cover member for soundproofing. For the purpose of allowing the writing light to pass inside and outside the polygon cover member, the polygon cover is provided with soundproof glasses 42a and 42b. Writing light as a light beam passes through the soundproof glasses 42a and 42b, so that it can go back and forth inside the polygon cover. The soundproof glass 42a is for transmitting the Y and C writing lights Ly and Lc. The soundproof glass 42b is for transmitting the M and K writing lights Lm and Lk.

ポリゴンミラーによって主走査方向に偏向せしめられながら、防音ガラス42aを透過したY,C用の書込光Ly,Lcは、それぞれ上下方向に並んだ状態で走査レンズ43aを透過する。この走査レンズ43aは、書込光Ly,Lcを主走査線方向および副走査線方向に集光することでポリゴンミラーによる主走査方向の等角度運動を等速直線運動へと変えるとともに、ポリゴンミラーの面倒れ補正を行う役割を担っている。防音ガラス42bを透過したM,K用の書込光Lm,Lkは、ポリゴンカバーを介して前述の走査レンズ43aとは反対側に位置している走査レンズ43bを透過する。   The Y and C writing lights Ly and Lc transmitted through the soundproof glass 42a while being deflected in the main scanning direction by the polygon mirror pass through the scanning lens 43a while being aligned in the vertical direction. The scanning lens 43a condenses the writing lights Ly and Lc in the main scanning line direction and the sub-scanning line direction, thereby changing the equiangular motion in the main scanning direction by the polygon mirror to constant velocity linear motion, and the polygon mirror It plays a role of correcting the trouble of falling. The M and K writing lights Lm and Lk that have passed through the soundproof glass 42b pass through the scanning lens 43b located on the opposite side of the scanning lens 43a through the polygon cover.

光書込ユニット4における4つの反射光学系は、それぞれ、上述したレーザーダイオード、反射鏡等から構成されている。具体的には、Y,C,M,Kの各色のうち、Y用の反射光学系を例にすると、これは、図示しないY用のレーザーダイオード、第1反射鏡44Y、第2反射鏡45Y、第3反射鏡46Y等を有している。これら反射鏡は、何れもレンズ機能を有さないミラーである。C,M,K用の反射光学系も、同様にして、レーザーダイオード、第1反射鏡(44C〜K)、第2反射鏡(45C〜K)、第3反射鏡46(C〜K)を有している。   The four reflecting optical systems in the optical writing unit 4 are each composed of the above-described laser diode, reflecting mirror, and the like. More specifically, of the colors Y, C, M, and K, taking a Y reflecting optical system as an example, this includes a Y laser diode (not shown), a first reflecting mirror 44Y, and a second reflecting mirror 45Y. And a third reflecting mirror 46Y. None of these reflecting mirrors has a lens function. Similarly, the reflection optical system for C, M, and K includes a laser diode, a first reflecting mirror (44C to K), a second reflecting mirror (45C to K), and a third reflecting mirror 46 (C to K). Have.

走査レンズ43a,43bを透過したY,C,M,K用の書込光Ly,Lc,Lm,Lkは、Y,C,M,K用の反射光学系の各反射鏡に向かう。例えば、走査レンズ43aを透過したY用の書込光Lyは、第1反射鏡44Y、第2反射鏡45Y、第3反射鏡46Yの鏡面を順次反射することで3回折り返されることで、Y用の感光体10Yの表面に導かれていく。C,M,K用のレーザー光Lc,Lm,Lkも同様にしてそれぞれ専用の3つの反射鏡で折り返されることで、C,M,K用の感光体10C,M,Kの表面に導かれていく。なお、第3反射鏡46Y,C,M,Kの鏡面で反射したY,C,M,K用の書込光Ly,Lc,Lm,Lkは、光書込ユニット4の上面に設けられた防塵ガラス48Y,48C,48M,48Kを透過した後、感光体10Y,M,C,Kの表面に到達する。   The Y, C, M, and K writing lights Ly, Lc, Lm, and Lk that have passed through the scanning lenses 43a and 43b travel toward the reflecting mirrors of the Y, C, M, and K reflecting optical systems. For example, the Y writing light Ly that has passed through the scanning lens 43a is reflected three times by sequentially reflecting the mirror surfaces of the first reflecting mirror 44Y, the second reflecting mirror 45Y, and the third reflecting mirror 46Y. Is guided to the surface of the photosensitive member 10Y. Similarly, the laser beams Lc, Lm, and Lk for C, M, and K are folded back by three dedicated reflecting mirrors, respectively, so that they are guided to the surfaces of the C, M, and K photoconductors 10C, M, and K. To go. The Y, C, M, and K writing lights Ly, Lc, Lm, and Lk reflected by the mirror surfaces of the third reflecting mirrors 46 Y, C, M, and K are provided on the upper surface of the optical writing unit 4. After passing through the dustproof glasses 48Y, 48C, 48M, and 48K, the light reaches the surfaces of the photoconductors 10Y, 10M, 10C, and 10K.

次に、本プリンタの特徴的な構成について説明する。
本プリンタの光書込ユニット4は、Y,C,M,K用の反射光学系にそれぞれ、何れか1つの反射鏡の湾曲状態を調整することで主走査線の湾曲方向や湾曲量を調整する湾曲補正機構と、その反射鏡の傾きを調整する傾き補正機構とを設けている。以下、Y用の反射光学系を例にして、湾曲補正機構や傾き補正機構について説明する。
Next, a characteristic configuration of the printer will be described.
The optical writing unit 4 of this printer adjusts the bending direction and the amount of bending of the main scanning line by adjusting the bending state of any one of the reflecting mirrors in the Y, C, M, and K reflecting optical systems. And a tilt correction mechanism for adjusting the tilt of the reflecting mirror. Hereinafter, the curvature correction mechanism and the tilt correction mechanism will be described by taking the Y reflection optical system as an example.

図4は、Y用の第3反射鏡46Yとその周囲構成とを、第3反射鏡46Yの鏡面側から示す斜視図である。また、図5は、Y用の第3反射鏡46Yの縦断面と、その周囲構成とを示す構成図である。これらの同図において、第3反射鏡46Yは、その裏面側に存在するコの字状の断面形状を有するホルダー52Yによって保持されている。そして、長手方向の両端部をそれぞれホルダー52Yの長手方向両端から突出させている。   FIG. 4 is a perspective view showing the third reflecting mirror 46Y for Y and the surrounding configuration from the mirror surface side of the third reflecting mirror 46Y. FIG. 5 is a configuration diagram showing a vertical cross section of the third reflecting mirror 46Y for Y and its surrounding configuration. In these figures, the third reflecting mirror 46Y is held by a holder 52Y having a U-shaped cross-sectional shape existing on the back side thereof. And the both ends of a longitudinal direction are made to protrude from the longitudinal direction both ends of the holder 52Y, respectively.

第3反射鏡46Yの長手方向の一端部裏面には、傾き補正機構が当接している。そして、この傾き補正機構は、図6に示すように、傾き調整パルスモータ56Y、モータホルダ57Y、傾き調整アジャスタ58Y等を有している。   An inclination correction mechanism is in contact with the back surface of one end of the third reflecting mirror 46Y in the longitudinal direction. As shown in FIG. 6, the tilt correction mechanism includes a tilt adjustment pulse motor 56Y, a motor holder 57Y, a tilt adjustment adjuster 58Y, and the like.

また、図5に示すように、第3反射鏡46Yの長手方向の中央部裏面には、湾曲調整機構の押込手段たる調整ネジ68Yが当接している。調整ネジ68Yは、ホルダー52Yの長手方向の中央部に設けられたネジ穴に取り付けられる。   Further, as shown in FIG. 5, an adjustment screw 68Y as a pushing means of the bending adjustment mechanism is in contact with the back surface of the central portion in the longitudinal direction of the third reflecting mirror 46Y. The adjusting screw 68Y is attached to a screw hole provided at the center in the longitudinal direction of the holder 52Y.

8は、傾き補正機構の傾き調整パルスモータ56Y及び傾き調整アジャスタ58Yを側面側から示す側面図である。また、図7は、傾き補正機構のモータホルダ57Y及び傾き調整アジャスタ58Yを示す平面図である。図8に示すように、傾き調整パルスモータ56Yの回転軸56aYには、雄ネジ部56bYが設けられている。傾き調整アジャスタ58は自らに設けられた雌ネジ部が前述の雄ネジ部56bYに螺号せしめられることで、回転軸56aYに固定される。傾き調整アジャスタ58Yは、図7に示すように、断面D形状をしており、モータホルダ57に設けられたD形状のアジャスタ挿入口57aYに挿入されている。傾き調整アジャスタ58Yは、傾き調整パルスモータ56Yの回転軸56aYが回転してもアジャスタ挿入口57aYに係止されるので回転することがない。そして、回転軸56aYの回転に伴うネジ送りによって図8の矢印D方向に昇降する。 FIG. 8 is a side view showing the inclination adjustment pulse motor 56Y and the inclination adjustment adjuster 58Y of the inclination correction mechanism from the side surface side. FIG. 7 is a plan view showing the motor holder 57Y and the tilt adjustment adjuster 58Y of the tilt correction mechanism. As shown in FIG. 8 , a male screw portion 56bY is provided on the rotation shaft 56aY of the inclination adjusting pulse motor 56Y. The inclination adjusting adjuster 58 is fixed to the rotary shaft 56aY by screwing a female screw portion provided on the tilt adjusting adjuster 58 to the male screw portion 56bY. As shown in FIG. 7 , the inclination adjustment adjuster 58 </ b> Y has a D-shaped cross section, and is inserted into a D-shaped adjuster insertion port 57 a </ i> Y provided in the motor holder 57. Even if the rotation shaft 56aY of the tilt adjustment pulse motor 56Y rotates, the tilt adjustment adjuster 58Y does not rotate because it is locked to the adjuster insertion port 57aY. And it raises / lowers in the arrow D direction of FIG. 8 by the screw feed accompanying rotation of the rotating shaft 56aY.

先に示した図5において、傾き調整パルスモータ56Yを保持しているモータホルダ57Yは、図示しない光書込ユニットのハウジングに固定されている。この傾き調整パルスモータ56Yの回転軸のネジ部に螺号せしめられた傾き調整アジャスタ58Yの頂部は、第3反射鏡46Yの端部の裏面に当接している。 In FIG. 5 shown above, the motor holder 57Y holding the tilt adjustment pulse motor 56Y is fixed to a housing of an optical writing unit (not shown). The top of the tilt adjustment adjuster 58Y screwed to the screw portion of the rotation shaft of the tilt adjustment pulse motor 56Y is in contact with the back surface of the end of the third reflecting mirror 46Y.

一方、第3反射鏡46Yにおける傾き調整パルスモータ56Yとは反対側の端部(以下、「支点側端部」という。)は、図示しないプリンタ本体のハウジングに形成された支持部66の上に載せられている。この状態で、図示しないハウジングに固定された板バネ69が裏面に押し当てられることで、支持部と板バネ69との間に挟み込まれている。   On the other hand, the end of the third reflecting mirror 46Y opposite to the tilt adjusting pulse motor 56Y (hereinafter referred to as “fulcrum side end”) is on a support 66 formed on the housing of the printer main body (not shown). It is on. In this state, the leaf spring 69 fixed to the housing (not shown) is pressed against the back surface, so that it is sandwiched between the support portion and the leaf spring 69.

傾き調整パルスモータ56Yの回転軸に螺号せしめられた傾き調整アジャスタ(図7の58Y)が回転軸の回動に伴って昇降すると、第3反射鏡46Yの一端部に対する傾き調整アジャスタの押込量が変化する。これにより、第3反射鏡46Yのモータ側端部が、支持部66と板バネ69との間に挟み込まれている支点側端部を支点にして、図9に示すようにアジャスタ昇降方向に揺動する。そして、この揺動によって第3反射鏡46Yの傾きが変化する。つまり、図示の第3反射鏡46Yは、傾き調整パルスモータ56Yの回動量の調整によって傾きが調整される。   When the tilt adjustment adjuster (58Y in FIG. 7) screwed to the rotation shaft of the tilt adjustment pulse motor 56Y moves up and down with the rotation of the rotation shaft, the pushing amount of the tilt adjustment adjuster with respect to one end of the third reflecting mirror 46Y is increased. Change. As a result, the motor-side end of the third reflecting mirror 46Y swings in the adjuster ascending / descending direction as shown in FIG. 9, with the fulcrum-side end sandwiched between the support 66 and the leaf spring 69 as a fulcrum. Move. Then, the tilt of the third reflecting mirror 46Y changes due to this swing. That is, the tilt of the third reflecting mirror 46Y shown in the drawing is adjusted by adjusting the rotation amount of the tilt adjusting pulse motor 56Y.

先に示した図5において、押込手段たる調整ネジ68Yの頂部を第3反射鏡46Yの長手方向の中央部裏面に当接させている。そして、調整ネジ68Yを締めたり緩めたりすることによって、第3反射鏡46Yの長手方向中央部に対する押込量を変化させる。   In FIG. 5 shown above, the top of the adjusting screw 68Y as the pushing means is brought into contact with the back surface of the central portion in the longitudinal direction of the third reflecting mirror 46Y. Then, by tightening or loosening the adjusting screw 68Y, the amount of pressing with respect to the central portion in the longitudinal direction of the third reflecting mirror 46Y is changed.

図10は、ホルダー52Y及び第3反射鏡46Yを長手方向の一端側から示す側面図である。図11は、ホルダー52Y及び第3反射鏡46Yの長手方向の一端側上方断面図である。ホルダー52Yの長手方向の両端部には、それぞれ第3反射鏡46Yに向けて突出する支持手段たる支持突起52aYが幅方向に並ぶように2個設けられている。
また、第3反射鏡46Yの裏面側に位置しながら第3反射鏡46Yを保持しているホルダー52Yは、長手方向の両端部に第3反射鏡46Yの反射面(鏡面)と対向する押圧部材固定手段たる板バネ部材支持突起52bYが、それぞれ鏡面の幅方向に並ぶように2つづつ設けられている。これら板バネ部材支持突起52bYは、それぞれ、支持手段たる支持突起52aYよりも長手方向中央よりに設けられている。
これら板バネ部材支持突起52bYには、押圧部材たる板バネ部材54Yの固定部54aYが係止されており、板バネ部材の板バネ部54bYが、第3反射鏡46Yの鏡面裏面(非鏡面)側に向けて付勢している。板バネ部54bYが第3反射鏡46Yを押圧する長手方向の押圧位置は、先に図16に示したようにホルダー52Yの支持突起52aYによる支持位置よりも中央側になっている。この位置で押圧される第3反射鏡46Yは、図12に点線で示すように、長手方向の中央部をおもて面側から裏面側に向けて撓ませるような形状で湾曲する。つまり、板バネ部材は、第3反射鏡46Yを強制的に湾曲させた状態で保持体であるホルダーに保持せしめる。
FIG. 10 is a side view showing the holder 52Y and the third reflecting mirror 46Y from one end side in the longitudinal direction. FIG. 11 is an upper cross-sectional view of one end side in the longitudinal direction of the holder 52Y and the third reflecting mirror 46Y. At both ends in the longitudinal direction of the holder 52Y, two support protrusions 52aY as support means projecting toward the third reflecting mirror 46Y are provided so as to be aligned in the width direction.
The holder 52Y holding the third reflecting mirror 46Y while being positioned on the back surface side of the third reflecting mirror 46Y has a pressing member that faces the reflecting surface (mirror surface) of the third reflecting mirror 46Y at both ends in the longitudinal direction. Two plate spring member support protrusions 52bY as fixing means are provided so as to be aligned in the width direction of the mirror surface. Each of the leaf spring member support protrusions 52bY is provided closer to the center in the longitudinal direction than the support protrusion 52aY as a support means.
These plate spring member support protrusion 52BY, the fixing portion 54aY of the pressing member serving as a leaf spring member 54Y and is engaged, the plate spring portion 54bY of the leaf spring member, the mirror surface of the third reflection mirror 46Y backside (non-specular ) Energized towards the side . The longitudinal pressing position at which the leaf spring portion 54bY presses the third reflecting mirror 46Y is closer to the center than the support position by the support protrusion 52aY of the holder 52Y as shown in FIG. As shown by a dotted line in FIG. 12, the third reflecting mirror 46Y pressed at this position is curved in such a shape as to bend the central part in the longitudinal direction from the front side toward the back side. That is, the leaf spring member is held by the holder that is the holding body in a state where the third reflecting mirror 46Y is forcibly bent.

第3反射鏡46Yはホルダー52Yや板バネ部材54Yによる保持で長手方向の中央部が調整ネジに向けて湾曲している。そして、調整ネジ68Yを締めることで、第3反射鏡46Yの中央部をホルダー52Yや板バネ部材による強制的な湾曲の方向とは逆方向に押し込む。これにより、第3反射鏡46Yの湾曲が戻される仕組みになっている。   The third reflecting mirror 46Y is held by the holder 52Y or the leaf spring member 54Y, and the central portion in the longitudinal direction is curved toward the adjusting screw. Then, by tightening the adjusting screw 68Y, the central portion of the third reflecting mirror 46Y is pushed in the direction opposite to the direction of forced bending by the holder 52Y or the leaf spring member. As a result, the third reflecting mirror 46Y is returned to the curved state.

かかる構成の反射光学系では、既に説明したように、第3反射鏡46Yを裏面側、鏡面側の何れの方向にも湾曲できるようにすることで、図示しない感光体の表面上の主走査線における副走査方向の上流側、下流側に向けての湾曲を何れも補正することができる。   In the reflecting optical system having such a configuration, as described above, the third reflecting mirror 46Y can be bent in either the back surface side or the mirror surface side, so that the main scanning line on the surface of the photoreceptor (not shown) is formed. Any of the curves toward the upstream side and the downstream side in the sub-scanning direction can be corrected.

先の図11に示すように、板バネ部材54Yの固定部54aYが係止される板バネ部材支持突起52bYを、反射鏡46Yの鏡面側に設けることで、板バネ部材54Yとして、固定部54aYと板バネ部54bYとが直接連結したものを用いることができる。これにより、板バネ部材54Yの公差変動による、反射鏡46Yへの押圧力の変動を防止することができる。以下に、図13に基づいて、具体的に説明する。   As shown in FIG. 11, the plate spring member support protrusion 52bY to which the fixing portion 54aY of the plate spring member 54Y is locked is provided on the mirror surface side of the reflecting mirror 46Y, so that the plate spring member 54Y is used as the fixing portion 54aY. And the leaf spring portion 54bY can be directly connected. Thereby, the fluctuation of the pressing force to the reflecting mirror 46Y due to the tolerance fluctuation of the leaf spring member 54Y can be prevented. This will be specifically described below with reference to FIG.

固定部54aYと板バネ部54bYとを直接連結することによって、板バネ部材54Yの公差変動によって変動するのは、板バネ部54bYの長さだけとなる。図13(a)は、公差範囲のうち板バネ部54bYの長さが最大の板バネ部材54Yを示す図であり、図13(b)は、公差範囲のうち板バネ部54bYの長さが最小の板バネ部材54Yを示す図である。
図に示すように、板バネ部材54Yは、固定部54aYと板バネ部54bYとが直接連結しているため、反射鏡の鏡面から板バネ部54bYの支点Qまでの距離が板バネ部材54Yの公差変動によって変動することがない。しかし、図に示すように、板バネ部材54Yの公差変動によって、板バネ部54bYの変位量が、長い場合と、短い場合とで大きく異なってしまう。しかしながら、板バネ部54bYの長さが長くなるにつれて、板バネ部54bYのバネ定数が小さくなるので、変位量が多くても、押圧力が大きくなることがない。また、板バネ部54bYの長さが短い場合は、変位量が少なくなるが、板バネ部54bYの長さが短い場合は、バネ定数が大きくなるので、変位量が少なくても、押圧力が小さくなることがない。
よって、板バネ部材54Yの公差変動による、反射鏡46Yへの押圧力の変動を防止することができるのである。
このように、板バネ部材54Yの公差変動によって、反射鏡46Yへの押圧力が変動することがないので、板バネ部材54Yの公差範囲を大きくでき、板バネ部材54Yの歩溜まりを抑制することができ、製造コストを削減することができる。
By directly connecting the fixing portion 54aY and the leaf spring portion 54bY, only the length of the leaf spring portion 54bY changes due to the tolerance variation of the leaf spring member 54Y. FIG. 13A is a view showing the leaf spring member 54Y having the maximum length of the leaf spring portion 54bY in the tolerance range, and FIG. 13B is a view showing the length of the leaf spring portion 54bY in the tolerance range. It is a figure which shows the minimum leaf | plate spring member 54Y.
As shown in the drawing, since the fixed portion 54aY and the leaf spring portion 54bY are directly connected to the leaf spring member 54Y, the distance from the mirror surface of the reflecting mirror to the fulcrum Q of the leaf spring portion 54bY is the same as that of the leaf spring member 54Y. Does not fluctuate due to tolerance fluctuations. However, as shown in the figure, due to the tolerance variation of the leaf spring member 54Y, the displacement amount of the leaf spring portion 54bY is greatly different between a long case and a short case. However, as the length of the leaf spring portion 54bY becomes longer, the spring constant of the leaf spring portion 54bY becomes smaller. Therefore, even if the displacement amount is large, the pressing force does not increase. Further, when the length of the leaf spring portion 54bY is short, the amount of displacement decreases. However, when the length of the leaf spring portion 54bY is short, the spring constant increases, so even if the amount of displacement is small, the pressing force does not increase. It will never become smaller.
Therefore, it is possible to prevent fluctuations in the pressing force to the reflecting mirror 46Y due to fluctuations in the tolerance of the leaf spring member 54Y.
As described above, since the pressing force to the reflecting mirror 46Y does not fluctuate due to the tolerance variation of the leaf spring member 54Y, the tolerance range of the leaf spring member 54Y can be increased, and the yield of the leaf spring member 54Y can be suppressed. Manufacturing costs can be reduced.

また、板バネ部材の固定部から、反射鏡の支持部までの反射鏡の鏡面と直交する方向の距離が変動してしまうと、反射鏡の鏡面から板バネ部54bYの支点Qまでの距離が変動してしまい、板バネ部材の反射鏡46Yへの押圧力が変動してしまう。板バネ部材を固定する部材と、反射鏡を支持する部材とを別々に設けた場合、板バネ部材を固定する部材の寸法公差と、反射鏡を支持する部材の寸法公差とが積みあがって、反射鏡の支持部までの反射鏡の鏡面と直交する方向の距離が大きく変動してしまうおそれがある。よって、それぞれの部材の寸法公差をシビアに設定する必要がある。
しかしながら、本実施形態のように、ホルダーに板バネ部材を固定する部分(板バネ部材支持突起)と、反射鏡を支持する部分(支持突起)をそれぞれ設け、押圧部材固定手段と、支持手段とを一体物とすることで、寸法公差の積みあがりがなくなり、板バネ部材の固定部から、反射鏡の支持部までの反射鏡の鏡面と直交する方向の距離が大きく変動するのを抑制することができる。これにより、板バネ部材を固定する部材と、反射鏡を支持する部材とを別々に設けた場合に比べて、反射鏡の鏡面から板バネ部54bYの支点Qまでの距離の変動を抑えることができ、板バネ部材の反射鏡46Yへの押圧力の変動を抑制することができる。
Further, if the distance in the direction perpendicular to the mirror surface of the reflecting mirror from the fixed portion of the leaf spring member to the support portion of the reflecting mirror varies, the distance from the mirror surface of the reflecting mirror to the fulcrum Q of the leaf spring portion 54bY It fluctuates and the pressing force of the leaf spring member to the reflecting mirror 46Y fluctuates. When the member for fixing the leaf spring member and the member for supporting the reflecting mirror are separately provided, the dimensional tolerance of the member for fixing the leaf spring member and the dimensional tolerance of the member for supporting the reflecting mirror are accumulated, There is a possibility that the distance in the direction orthogonal to the mirror surface of the reflecting mirror to the support portion of the reflecting mirror may vary greatly. Therefore, it is necessary to set the dimensional tolerance of each member severely.
However, as in this embodiment, a portion for fixing the leaf spring member to the holder (plate spring member support protrusion) and a portion for supporting the reflecting mirror (support protrusion) are provided, respectively, and a pressing member fixing means, a support means, As a single unit, there is no increase in dimensional tolerances, and it is possible to suppress a large variation in the distance in the direction perpendicular to the mirror surface of the reflecting mirror from the fixing portion of the leaf spring member to the supporting portion of the reflecting mirror. Can do. Thereby, compared with the case where the member which fixes a leaf | plate spring member and the member which supports a reflecting mirror are provided separately, the fluctuation | variation of the distance from the mirror surface of a reflecting mirror to the fulcrum Q of leaf | plate spring part 54bY can be suppressed. It is possible to suppress fluctuations in the pressing force of the leaf spring member to the reflecting mirror 46Y.

図14は、板バネ部材54Yの変形例を示す概略斜視図である。
先の図11に示すように、反射鏡46Yは、板バネ部材54Yとホルダー52Yとによって挟持されている。装置の輸送時の振動や衝撃などによって、反射鏡46Yが板バネ部材54Yの押圧力に抗って、板バネ部材54Yの押圧方向と反対側へ変位することがある。その変位量が大きいと、反射鏡46Yがホルダー52Yと板バネ部材54Yとによって挟持されなくなる期間が長くなり、ホルダー52Yから脱落してしまう場合があった。
そこで、図14に示す変形例の板バネ部材54Yは、固定部54aYの幅方向両側に板バネ部54bYの変位を規制する規制部たるストッパー部54dYを設けた。これにより、図14(b)に示すように、板バネ部54bYが、固定部側へ変位すると、固定部側へ折れ曲がった板バネ部54bYの先端がストッパー部54dYに当接して、固定部側への変位が規制される。このようなストッパー部54dYを備えた板バネ部材54Yで、反射鏡46Yを押圧することによって、振動や衝撃などによって反射鏡46Yが板バネ部材54Yの押圧方向と反対側へ変位したとき、ストッパー部54dYによってその変位が規制される。これにより、反射鏡46Yが板バネ部材54Yの押圧方向と反対側に大きく変位するのを抑制することができ、反射鏡46Yがホルダー52Yと板バネ部材54Yとによって挟持されなくなる期間を短くすることができる。よって、反射鏡46Yがホルダー52Yから脱落してしまうのを抑制することができる。
FIG. 14 is a schematic perspective view showing a modification of the leaf spring member 54Y.
As shown in FIG. 11, the reflecting mirror 46Y is sandwiched between the leaf spring member 54Y and the holder 52Y. The reflection mirror 46Y may be displaced to the opposite side of the pressing direction of the leaf spring member 54Y against the pressing force of the leaf spring member 54Y due to vibration or impact during transportation of the apparatus. If the amount of displacement is large, the period during which the reflecting mirror 46Y is not sandwiched between the holder 52Y and the leaf spring member 54Y becomes long, and may fall off the holder 52Y.
Accordingly, the leaf spring member 54Y of the modification shown in FIG. 14 is provided with a stopper portion 54dY as a restricting portion for restricting the displacement of the leaf spring portion 54bY on both sides in the width direction of the fixed portion 54aY. As a result, as shown in FIG. 14B, when the leaf spring portion 54bY is displaced to the fixed portion side, the tip of the leaf spring portion 54bY bent to the fixed portion side comes into contact with the stopper portion 54dY, and the fixed portion side. Displacement to is restricted. When the reflecting mirror 46Y is pressed by the leaf spring member 54Y having such a stopper portion 54dY and the reflecting mirror 46Y is displaced to the opposite side of the pressing direction of the leaf spring member 54Y by vibration or impact, the stopper portion The displacement is regulated by 54dY. Thereby, it can suppress that the reflective mirror 46Y largely displaces to the opposite side to the pressing direction of the leaf | plate spring member 54Y, and shorten the period when the reflective mirror 46Y is not clamped by the holder 52Y and the leaf | plate spring member 54Y. Can do. Therefore, it is possible to prevent the reflecting mirror 46Y from dropping from the holder 52Y.

Y用の反射光学系における傾き補正機構や湾曲補正機構(ホルダー及び押込手段)について説明したが、C,M,K用の反射光学系も同様の構成になっている。また、傾き調整機構や湾曲補正機構を第3反射鏡に設けた例について説明したが、第1反射鏡や第2反射鏡に設けてもよい。また、Y,C,M,K用の全ての反射光学系に傾き補正機構や湾曲補正機構を設けた例について説明したが、何れか1つの反射光学系における主走査線の傾きや湾曲に合わせて、他の反射光学系における主走査線の傾きや湾曲を補正する場合には、基準となる反射光学系に傾き補正機構や湾曲補正機構を設ける必要はない。この場合、レーザーダイオードの数よりも1つ少ない数だけ、傾き補正機構や湾曲補正機構を設ければよいのである。   Although the tilt correction mechanism and the curvature correction mechanism (holder and pushing means) in the Y reflection optical system have been described, the C, M, and K reflection optical systems have the same configuration. Moreover, although the example which provided the inclination adjustment mechanism and the curvature correction mechanism in the 3rd reflective mirror was demonstrated, you may provide in a 1st reflective mirror or a 2nd reflective mirror. In addition, the example in which the tilt correction mechanism and the curvature correction mechanism are provided in all the reflection optical systems for Y, C, M, and K has been described. However, according to the tilt or the curvature of the main scanning line in any one of the reflection optical systems. Thus, when correcting the inclination or curvature of the main scanning line in another reflection optical system, it is not necessary to provide an inclination correction mechanism or a curvature correction mechanism in the reference reflection optical system. In this case, it is only necessary to provide the inclination correction mechanism and the curvature correction mechanism by a number one less than the number of laser diodes.

感光体上での主走査線の傾き調整は、本プリンタの出荷時に行われるとともに、本プリンタの稼働時において例えばプリント枚数が所定枚数に達したタイミングやユーザー指示を受けたタイミング等の所定のタイミングでも行われる。傾き調整では、まず、図3に示した各色の感光体10Y,10C,10M,10K上に通常の画像形成動作時と同じ動作で、予め決められた位置ずれ検知用の静電潜像が形成される。そして、通常の画像形成動作時と同じ動作で、各色の位置ずれ検知用の静電潜像が現像されて、各色の位置ずれ検知用のトナー像となる。これらトナー像が中間転写ベルトの互いにずれた位置に1次転写されると、各色のトナー像が所定パターンで並ぶ位置ずれ検知用パターン像となる。その後、中間転写ベルトの無端移動に伴って、ベルト上の位置ずれ検知用パターン像の各トナー像が図示しない光学センサによって検知される。本プリンタの図示しない制御部は、この光学センサによる各トナー像の検知タイミングに基づいて、各トナー像の相対的位置ずれを把握する。そして、把握結果に基づいて、各トナー像の位置ズレ量を最小にし得る黒(K)用の主走査線に対する他色(Y、C、M)用の主走査線の傾き量をそれぞれ算出する。次に、算出結果に基づいて、傾き調整パルスモータ(例えば56Y)を所定の回転角度だけ正回転又は逆回転させる。これによって反射鏡の傾きが変化すると、鏡面に対する書込光Lの入射位置が変わるため、感光体上での主走査線の傾きが変化する。この結果、調整前に生じていた主走査線の傾きを補正することができる。   The inclination of the main scanning line on the photosensitive member is adjusted at the time of shipment of the printer, and at the time of operation of the printer, for example, a predetermined timing such as a timing when the number of prints reaches a predetermined number or a timing when a user instruction is received. But it is done. In the tilt adjustment, first, an electrostatic latent image for detecting a predetermined misregistration is formed on the photoconductors 10Y, 10C, 10M, and 10K of the respective colors shown in FIG. 3 by the same operation as the normal image forming operation. Is done. Then, the electrostatic latent image for detecting the misregistration of each color is developed by the same operation as that in the normal image forming operation, and becomes a toner image for detecting misregistration of each color. When these toner images are primarily transferred at positions shifted from each other on the intermediate transfer belt, the toner images of the respective colors become the position shift detection pattern images arranged in a predetermined pattern. Thereafter, with the endless movement of the intermediate transfer belt, each toner image of the misregistration detection pattern image on the belt is detected by an optical sensor (not shown). A control unit (not shown) of the printer grasps the relative positional deviation of each toner image based on the detection timing of each toner image by the optical sensor. Based on the grasped result, the inclination amount of the main scanning line for other colors (Y, C, M) with respect to the main scanning line for black (K) that can minimize the amount of positional deviation of each toner image is calculated. . Next, based on the calculation result, the tilt adjustment pulse motor (for example, 56Y) is rotated forward or backward by a predetermined rotation angle. When the tilt of the reflecting mirror is changed by this, the incident position of the writing light L with respect to the mirror surface is changed, so that the tilt of the main scanning line on the photosensitive member is changed. As a result, the inclination of the main scanning line that occurred before adjustment can be corrected.

感光体上での主走査線の湾曲調整は、本プリンタの出荷時に行われる。装置組立直後の初期状態では、反射鏡が先に示した図12に示した点線のような姿勢で湾曲している。このような初期状態においては、主走査線も湾曲した形状になる。この初期状態から、調整ネジ68Yを締めて、調整ねじを反射鏡(例えば46Y)の長手方向の他端部裏面に当接させ、主走査線の湾曲を補正することができる。   The curve adjustment of the main scanning line on the photoconductor is performed when the printer is shipped. In the initial state immediately after the assembly of the apparatus, the reflecting mirror is curved in the posture shown by the dotted line shown in FIG. In such an initial state, the main scanning line also has a curved shape. From this initial state, the adjustment screw 68Y is tightened, and the adjustment screw is brought into contact with the back surface of the other end in the longitudinal direction of the reflecting mirror (for example, 46Y) to correct the curvature of the main scanning line.

また、押込手段を、傾き補正機構と同様の構成として、自動的に湾曲を補正できるようにしてもよい。すなわち、調整パルスモータの回転駆動によって、調整アジャスタを昇降させることで、押込量を調整することで、主走査線における副走査方向の湾曲を補正するのである。このように押込手段を自動的に行うるようにした場合は、湾曲調整を、傾き調整と並行して行ってもよい。具体的には、制御部は、上述した位置ずれ検知用パターン像の検知結果に基づいて、各色(K、Y、C、M)の主走査線の湾曲量を把握する。そして、把握した各湾曲量を最小にする各色(K、Y、C、M)用の鏡曲湾曲量を算出した後、算出結果に基づいて、曲がり調整用の調整パルスモータを所定の回転角度だけ正回転又は逆回転させる。これにより、主走査線の湾曲が補正される。 Further, the pushing means may have the same configuration as the tilt correction mechanism so that the curvature can be automatically corrected. That is, by adjusting the push-in amount by moving the adjustment adjuster up and down by the rotational drive of the adjustment pulse motor, the curvature in the sub-scanning direction in the main scanning line is corrected. When the pushing means is automatically performed as described above, the bending adjustment may be performed in parallel with the inclination adjustment. Specifically, the control unit grasps the amount of curvature of the main scanning line of each color (K, Y, C, M) based on the detection result of the above-described misregistration detection pattern image. Then, each color to minimize the curvature amount after grasping (K, Y, C, M ) after calculating the mirror song bending amount for calculation based on the result, bending rotate adjustment Parusumo data for adjustment of a predetermined Rotate forward or backward by an angle. Thereby, the curvature of the main scanning line is corrected.

以上、本実施形態の湾曲補正機構は、光ビーム発射手段たるレーザーダイオードと、レーザーダイオードから発射された光ビームたる書込光を主走査方向に偏向せしめるポリゴンモータやポリゴンミラーなどからなる偏向手段と、書込光を反射させる反射鏡とを有し、書込光によって走査対象物たる感光体を光走査する光走査装置たる光書込ユニットに用いられる。
湾曲補正機構は、反射鏡の長手方向の両端部でそれぞれ、反射鏡の裏面に当接して反射鏡を支持する支持手段たる支持突起と、反射鏡の長手方向において支持突起の支持位置と異なる位置で反射鏡の鏡面を鏡面と直交する方向に押圧する押圧部材たる板バネ部材とで構成され、反射鏡を強制的に湾曲させる強制湾曲手段を有している。また、反射鏡を鏡面と直交する方向に押し込むことで反射鏡の強制湾曲方向とは逆方向への湾曲力を付与する押込手段たる調整ネジも有しており、調整ネジによる押込量の調整によって感光体面上での主走査線の湾曲を補正する。このような構成の湾曲補正機構において、板バネ部材が固定される押圧部材固定手段たる板バネ部材支持突起を、反射鏡の鏡面側に設けている。このような構成を有することで、板バネ部材の反射鏡の鏡面を押圧する押圧部たる板バネ部と、板バネ部材支持突起に固定される固定部とを直接連結することが可能となる。よって、板バネ部材を、反射鏡の裏面側で固定するもののように、板バネ部と固定部とを連結するためのアーム部が不要にすることができる。これにより、板バネ部の支点の位置が、板バネ部材の寸法公差などの公差変動によって変動することが抑制される。よって、板バネ部材の公差変動による押圧力の変動を抑制することができ、板バネ部材の押圧力を高めに設定しなくても、反射鏡を強制的に湾曲させることができる。
As described above, the curvature correction mechanism of the present embodiment includes a laser diode as a light beam emitting means, and a deflecting means including a polygon motor and a polygon mirror that deflect writing light as a light beam emitted from the laser diode in the main scanning direction. And a reflecting mirror that reflects the writing light, and is used in an optical writing unit that is an optical scanning device that optically scans a photosensitive member that is a scanning object with the writing light.
The curvature correction mechanism includes a support protrusion as a support means for supporting the reflecting mirror by contacting the back surface of the reflecting mirror at both ends in the longitudinal direction of the reflecting mirror, and a position different from the supporting position of the supporting protrusion in the longitudinal direction of the reflecting mirror. in the mirror surface of the anti Ikyo it is composed of a pressing member serving plate spring member for pressing in a direction perpendicular to the mirror surface, and a forced bending means for forcibly bending the reflector. It also has an adjustment screw that serves as a pushing means that applies a bending force in the direction opposite to the forced bending direction of the reflecting mirror by pushing the reflecting mirror in a direction perpendicular to the mirror surface. The curvature of the main scanning line on the photoreceptor surface is corrected. In the bending correction mechanism having such a configuration, a leaf spring member supporting protrusion as a pressing member fixing means to which the leaf spring member is fixed is provided on the mirror surface side of the reflecting mirror. By having such a configuration, it is possible to directly connect the leaf spring portion, which is a pressing portion that presses the mirror surface of the reflecting mirror of the leaf spring member, and the fixed portion that is fixed to the leaf spring member support protrusion. Therefore, it is possible to eliminate the need for an arm portion for connecting the leaf spring portion and the fixing portion, as in the case where the leaf spring member is fixed on the back surface side of the reflecting mirror. Thereby, it is suppressed that the position of the fulcrum of the leaf | plate spring part is fluctuate | varied by tolerance fluctuations, such as a dimensional tolerance of a leaf | plate spring member. Therefore, the fluctuation of the pressing force due to the tolerance fluctuation of the leaf spring member can be suppressed, and the reflecting mirror can be forcibly bent without setting the pushing force of the leaf spring member high.

また、ホルダーに板バネ部材を固定する部分(板バネ部材支持突起)と、反射鏡を支持する部分(支持突起)をそれぞれ設け、押圧部材固定手段と、支持手段とを一体物とすることで、寸法公差の積みあがりがなくなり、板バネ部材の固定部から、反射鏡の支持部までの反射鏡の鏡面と直交する方向の距離が大きく変動するのを抑制することができる。これにより、板バネ部材を固定する部材と、反射鏡を支持する部材とを別々に設けた場合に比べて、反射鏡の鏡面から板バネ部54bYの支点Qまでの距離の変動を抑えることができ、板バネ部材の反射鏡46Yへの押圧力の変動を抑制することができる。
また、ホルダー本体に押圧部材固定手段と、支持手段とが一体形成されたものを用いているので、押圧部材を固定するための部材と、反射鏡を支持するための部材とを別々に設けた場合に比べて、低コスト化を図ることができる。
In addition, by providing a portion for fixing the leaf spring member to the holder (plate spring member support protrusion) and a portion for supporting the reflecting mirror (support protrusion), the pressing member fixing means and the support means are integrated. Dimension tolerances are not increased, and it is possible to prevent the distance in the direction perpendicular to the mirror surface of the reflecting mirror from the fixing portion of the leaf spring member to the support portion of the reflecting mirror from being greatly changed. Thereby, compared with the case where the member which fixes a leaf | plate spring member and the member which supports a reflecting mirror are provided separately, the fluctuation | variation of the distance from the mirror surface of a reflecting mirror to the fulcrum Q of leaf | plate spring part 54bY can be suppressed. It is possible to suppress fluctuations in the pressing force of the leaf spring member to the reflecting mirror 46Y.
In addition, since the holder body is integrally formed with the pressing member fixing means and the supporting means, a member for fixing the pressing member and a member for supporting the reflecting mirror are provided separately. Compared to the case, the cost can be reduced.

また、板バネ部材の押圧部たる板バネ部の押圧方向と逆方向の変位を規制する規制部たるストッパー部を板バネ部材に設けた。これにより、振動や衝撃などによって反射鏡が板バネ部とともに、板バネ部の押圧方向と反対側へと変位したとき、ストッパー部54dYによってその変位が規制される。これにより、振動や衝撃が生じたときに反射鏡が板バネ部材の押圧方向と反対側にに大きく変位するのを抑制することができ、反射鏡がホルダーと板バネ部材とによって挟持されなくなる期間を短くすることができる。これにより、反射鏡がホルダーから脱落してしまうのを抑制することができる。   Moreover, the stopper part which is a control part which controls the displacement of the direction opposite to the press direction of the leaf | plate spring part which is a press part of a leaf | plate spring member was provided in the leaf | plate spring member. Thus, when the reflecting mirror is displaced together with the leaf spring portion to the opposite side of the pressing direction of the leaf spring portion due to vibration or impact, the displacement is regulated by the stopper portion 54dY. As a result, it is possible to prevent the reflecting mirror from being greatly displaced to the opposite side of the pressing direction of the leaf spring member when vibration or impact occurs, and the period during which the reflecting mirror is not held between the holder and the leaf spring member Can be shortened. Thereby, it can suppress that a reflective mirror falls off from a holder.

また、光走査装置たる光書込ユニットとして、上述の湾曲補正機構を用いることで、走査線の副走査方向の湾曲を良好に補正することができる。   Further, by using the above-described curvature correction mechanism as an optical writing unit that is an optical scanning device, it is possible to favorably correct the curvature of the scanning line in the sub-scanning direction.

また、光書込ユニットは、反射鏡の姿勢を変化させて感光体の表面上における主走査線の傾きを調整する傾き調整手段たる傾き補正機構を設けることで、走査線の副走査方向の傾きを補正することができる。   Further, the optical writing unit is provided with an inclination correction mechanism that is an inclination adjusting means for adjusting the inclination of the main scanning line on the surface of the photosensitive member by changing the posture of the reflecting mirror, whereby the inclination of the scanning line in the sub-scanning direction is provided. Can be corrected.

また、画像形成装置として、上述の光書込ユニットを用いることで、色ずれのない良好な画像を得ることができる。   Further, by using the above-described optical writing unit as the image forming apparatus, it is possible to obtain a good image without color misregistration.

実施形態に係るプリンタを示す概略構成図。1 is a schematic configuration diagram illustrating a printer according to an embodiment. 同プリンタにおけるY用の作像ステーションを示す概略構成図。FIG. 2 is a schematic configuration diagram illustrating an image forming station for Y in the printer. 同プリンタおける光書込ユニットを、4つの感光体とともに示す概略構成図。FIG. 2 is a schematic configuration diagram showing an optical writing unit in the printer together with four photosensitive members. 同光書込ユニットのY用の第3反射鏡とその周囲構成とを、第3反射鏡の鏡面側から示す斜視図。The perspective view which shows the 3rd reflective mirror for Y of the same optical writing unit, and its surrounding structure from the mirror surface side of a 3rd reflective mirror. 同第3反射鏡の縦断面と、その周囲構成とを示す構成図。The block diagram which shows the longitudinal cross-section of the 3rd reflective mirror, and its surrounding structure. 同光書込ユニットのY用の傾き調整機構を示す拡大斜視図。The expansion perspective view which shows the inclination adjustment mechanism for Y of the same optical writing unit. 同傾き補正機構の傾き調整パルスモータ及び傾き調整アジャスタを側面側から示す側面図。The side view which shows the inclination adjustment pulse motor and inclination adjustment adjuster of the inclination correction mechanism from the side surface side. 同傾き補正機構のモータホルダ及び傾き調整アジャスタを示す平面図。The top view which shows the motor holder and inclination adjustment adjuster of the inclination correction mechanism. 同第3反射鏡の縦断面を、同傾き補正機構及びホルダーとともに示す拡大構成図。The expanded block diagram which shows the longitudinal cross-section of the said 3rd reflective mirror with the same inclination correction mechanism and a holder. 同第3反射鏡と板バネ部材とを反射鏡の長手方向端部側から示す側面図。The side view which shows the 3rd reflective mirror and leaf | plate spring member from the longitudinal direction edge part side of a reflective mirror. 同第3反射鏡と板バネ部材とを反射鏡の幅方向向端部側から示す断面図。Sectional drawing which shows the 3rd reflective mirror and leaf | plate spring member from the width direction direction edge part side of a reflective mirror. 同ホルダーによって保持される同第3反射鏡の強制的な撓みを説明する模式図。The schematic diagram explaining the forced bending of the 3rd reflective mirror hold | maintained by the holder. (a)は、板バネ部の長さが長いときの変位量を模式的に示した図。(b)は、板バネ部の長さが短いときの変位量を模式的に示した図。(A) is the figure which showed typically the amount of displacement when the length of a leaf | plate spring part is long. (B) is the figure which showed typically the displacement amount when the length of a leaf | plate spring part is short. 変形例1の板バネ部材を示す概略構成図。The schematic block diagram which shows the leaf | plate spring member of the modification 1. FIG. 感光体と、その表面上における主走査線とを示す斜視図。FIG. 3 is a perspective view showing a photoreceptor and main scanning lines on the surface thereof. 開発中の光書込装置における反射鏡とその周囲構成とを示す拡大構成図。The enlarged block diagram which shows the reflective mirror in the optical writing apparatus under development, and its surrounding structure. 開発中の光書込装置における反射鏡を長手方向の一端側から示す側面図。The side view which shows the reflective mirror in the optical writing apparatus under development from the one end side of a longitudinal direction. 湾曲補正後の主走査線の形状を、押込装置によって強制的な湾曲を直された状態の反射鏡とともに示す図。The figure which shows the shape of the main scanning line after curvature correction | amendment with the reflective mirror of the state by which forced curve was corrected by the pushing-in apparatus.

符号の説明Explanation of symbols

4:光書込ユニット
5:中間転写ユニット
10Y,C,M,K:感光体
12Y,C,M,K:現像装置
20:中間転写ベルト
41a,b:ポリゴンミラー
44Y,C,M,K:第1反射鏡
45Y,C,M,K:第2反射鏡
46Y,C,M,K:第3反射鏡
52Y:ホルダー
54Y:板バネ部材
56Y:傾き調整パルスモータ
57Y:モータホルダ)
58Y:傾き調整アジャスタ
68Y:調整ねじ
4: Optical writing unit 5: Intermediate transfer unit 10Y, C, M, K: Photoconductor 12Y, C, M, K: Developing device 20: Intermediate transfer belt 41a, b: Polygon mirror 44Y, C, M, K: First reflecting mirror 45Y, C, M, K: Second reflecting mirror 46Y, C, M, K: Third reflecting mirror 52Y: Holder 54Y: Leaf spring member 56Y: Tilt adjustment pulse motor 57Y: Motor holder)
58Y: Tilt adjustment adjuster 68Y: Adjustment screw

Claims (4)

光ビーム発射手段と、前記光ビーム発射手段から発射された光ビームを主走査方向に偏向せしめる偏向手段と、前記光ビームを反射させる反射鏡とを有し、前記光ビームによって走査対象物を光走査する光走査装置に用いられ、
前記反射鏡の長手方向の両端部でそれぞれ、前記反射鏡の裏面に当接して前記反射鏡を支持する支持手段と、
前記反射鏡の長手方向において前記支持手段の支持位置と異なる位置で前記反射鏡の鏡面を前記鏡面と直交する方向に押圧して、前記反射鏡を強制的に湾曲させる押圧部材と、
前記反射鏡を鏡面と直交する方向に押し込むことで前記押圧部材による反射鏡の強制湾曲方向とは逆方向への湾曲させる押込手段とを具備し、
前記押込手段による押込量の調整によって前記走査対象物表面上での主走査線の湾曲を補正する湾曲補正機構において、
前記反射鏡の長手方向の両端部にそれぞれ前記支持手段を備え、前記反射鏡の鏡面と直交するある一方向に切った断面形状がコの字形状であって、前記反射鏡の裏面と前記反射鏡の長手方向および前記鏡面と直交する方向に平行な面とに内面が対向する部分を有し、前記コの字形状の各先端から前記鏡面に対して平行に延在し前記押圧部材が固定される押圧部材固定部を、前記長手方向両端部でかつ前記支持手段よりも中央側にそれぞれ設け、前記支持部材よりも中央側で前記押圧部材によって前記鏡面を押圧することで、前記反射鏡を強制的に湾曲させた状態で保持するホルダを備え、
前記押圧部材は、前記押圧部材固定部に当接する固定部と、前記鏡面に当接して前記鏡面を押圧する押圧部とを有する断面V字状の板バネ部材であり、
前記板バネ部材は、前記長手方向中央側に向かうに連れて、固定部と押圧部との開きが大きくなるような向きで、前記押圧部材固定部に固定され、
前記板バネ部材の固定部に前記押圧部の押圧方向と逆方向の変位を規制する規制部を設けたことを特徴とする湾曲補正機構。
A light beam emitting means; a deflecting means for deflecting the light beam emitted from the light beam emitting means in a main scanning direction; and a reflecting mirror for reflecting the light beam. Used for scanning optical scanning device,
Support means for supporting the reflecting mirror by contacting the back surface of the reflecting mirror at both ends in the longitudinal direction of the reflecting mirror;
To press the mirror before Symbol reflector in a direction perpendicular to the mirror surface at the support position different from the position of the supporting means in the longitudinal direction of the reflector, and a pressing member to forcibly bend the reflection mirror,
A pushing means for bending the reflecting mirror in a direction opposite to the forced bending direction of the reflecting mirror by the pressing member by pushing the reflecting mirror in a direction perpendicular to the mirror surface;
In a curvature correction mechanism that corrects the curvature of the main scanning line on the surface of the scanning object by adjusting the amount of pushing by the pushing means,
The supporting means is provided at both ends in the longitudinal direction of the reflecting mirror, and the cross-sectional shape cut in one direction orthogonal to the mirror surface of the reflecting mirror is a U-shape, and the back surface of the reflecting mirror and the reflecting The inner surface is opposed to a longitudinal direction of the mirror and a surface parallel to the direction orthogonal to the mirror surface, and extends in parallel to the mirror surface from each of the U-shaped tips, and the pressing member is fixed. The pressing member fixing portions are provided at both ends in the longitudinal direction and closer to the center side than the support means, and the mirror surface is pressed by the pressing member at the center side than the support member, whereby the reflecting mirror is It has a holder that holds it in a forced curved state,
The pressing member is a leaf spring member having a V-shaped cross section having a fixing portion that contacts the pressing member fixing portion and a pressing portion that contacts the mirror surface and presses the mirror surface.
The leaf spring member is fixed to the pressing member fixing portion in such a direction that the opening between the fixing portion and the pressing portion becomes larger toward the longitudinal center side .
A bending correction mechanism characterized in that a restricting portion for restricting displacement in a direction opposite to the pressing direction of the pressing portion is provided in a fixing portion of the leaf spring member.
光ビーム発射手段と、前記光ビーム発射手段から発射された光ビームを主走査方向に偏向せしめる偏向手段と、前記光ビームを反射させる反射鏡と、走査対象物の表面上における主走査線の湾曲を補正する湾曲補正手段とを備え、前記光ビームによって前記走査対象物を光走査する光走査装置において、
前記湾曲補正手段として、請求項1の湾曲補正機構を用いたことを特徴とする光走査装置。
A light beam emitting means; a deflecting means for deflecting the light beam emitted from the light beam emitting means in a main scanning direction; a reflecting mirror for reflecting the light beam; and a curve of the main scanning line on the surface of the scanning object. And an optical scanning device that optically scans the scanning object with the light beam.
An optical scanning apparatus using the curvature correction mechanism according to claim 1 as the curvature correction means.
請求項2の光走査装置において、
前記反射鏡の姿勢を変化させて前記走査対象物の表面上における主走査線の傾きを調整する傾き調整手段を備えたことを特徴とする光走査装置。
The optical scanning device according to claim 2.
An optical scanning apparatus comprising: an inclination adjusting unit that adjusts an inclination of a main scanning line on the surface of the scanning object by changing an attitude of the reflecting mirror.
潜像を担持する潜像担持体と、光走査によって前記潜像担持体の表面に潜像を形成する光走査手段と、前記潜像担持体に担持された潜像を現像する現像手段とを備える画像形成装置において、
前記光走査手段として、請求項2または3の光走査装置を用いたことを特徴とする画像形成装置。
A latent image carrier that carries a latent image; an optical scanning unit that forms a latent image on the surface of the latent image carrier by optical scanning; and a developing unit that develops the latent image carried on the latent image carrier. In the image forming apparatus provided,
An image forming apparatus using the optical scanning device according to claim 2 or 3 as the optical scanning unit.
JP2007321125A 2007-12-12 2007-12-12 Curvature correction mechanism, optical scanning device, and image forming apparatus Expired - Fee Related JP5505753B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007321125A JP5505753B2 (en) 2007-12-12 2007-12-12 Curvature correction mechanism, optical scanning device, and image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007321125A JP5505753B2 (en) 2007-12-12 2007-12-12 Curvature correction mechanism, optical scanning device, and image forming apparatus

Publications (2)

Publication Number Publication Date
JP2009145495A JP2009145495A (en) 2009-07-02
JP5505753B2 true JP5505753B2 (en) 2014-05-28

Family

ID=40916181

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007321125A Expired - Fee Related JP5505753B2 (en) 2007-12-12 2007-12-12 Curvature correction mechanism, optical scanning device, and image forming apparatus

Country Status (1)

Country Link
JP (1) JP5505753B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5549194B2 (en) * 2009-11-19 2014-07-16 富士ゼロックス株式会社 Exposure device accommodation mechanism and image forming apparatus
JP5403432B2 (en) 2010-06-22 2014-01-29 株式会社リコー Main scanning line curvature correction mechanism, optical scanning device, and image forming apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3327581B2 (en) * 1992-07-21 2002-09-24 キヤノン株式会社 Scanning optical device
JPH06183056A (en) * 1992-12-17 1994-07-05 Canon Inc Image forming device, two-way scanning optical device and photoscanning device
JP3324302B2 (en) * 1994-11-15 2002-09-17 富士ゼロックス株式会社 Image forming device
JP2000292729A (en) * 1999-04-08 2000-10-20 Ricoh Co Ltd Optical scanner
JP2003182146A (en) * 2001-12-18 2003-07-03 Fuji Xerox Co Ltd Imaging apparatus
JP2005134624A (en) * 2003-10-30 2005-05-26 Canon Inc Optical scanner and image forming apparatus using same
JP4765493B2 (en) * 2005-09-07 2011-09-07 富士ゼロックス株式会社 Image forming apparatus

Also Published As

Publication number Publication date
JP2009145495A (en) 2009-07-02

Similar Documents

Publication Publication Date Title
JP5354323B2 (en) Optical scanning apparatus and image forming apparatus
EP1750156B1 (en) Optical scanning device and image forming apparatus
JP5050262B2 (en) Image forming apparatus
JP2008216438A (en) Optical scanner and image forming apparatus
JP6489410B2 (en) Optical scanning apparatus and image forming apparatus
JP5016997B2 (en) Optical scanning apparatus and image forming apparatus
JP5403432B2 (en) Main scanning line curvature correction mechanism, optical scanning device, and image forming apparatus
US20090168133A1 (en) Optical scanner and image forming apparatus including the same
JP4887268B2 (en) Curvature correction mechanism, optical scanning device, and image forming apparatus
JP5170629B2 (en) Optical scanning apparatus and image forming apparatus
JP5207132B2 (en) Optical scanning apparatus and image forming apparatus
JP5505753B2 (en) Curvature correction mechanism, optical scanning device, and image forming apparatus
JP2007025014A (en) Adjusting apparatus, optical scanner and image forming apparatus
JP5081511B2 (en) Optical scanning apparatus and image forming apparatus
JP2015138226A (en) Optical scanning device and image forming apparatus
JP2009258449A (en) Optical scanner and image forming apparatus
JP2010014976A (en) Optical scanner and image forming apparatus
JP5152641B2 (en) Curvature correction mechanism, optical scanning device, and image forming apparatus
JP5448035B2 (en) Curvature correction mechanism, optical scanning device, and image forming apparatus
JP5455085B2 (en) Optical scanning apparatus and image forming apparatus
JP5488960B2 (en) Curvature correction mechanism, optical scanning apparatus, image forming apparatus, and optical scanning apparatus manufacturing method
JP4994069B2 (en) Scanning line adjustment apparatus, optical scanning apparatus, and image forming apparatus
JP4075365B2 (en) Optical scanning device
JPH1184803A (en) Image forming device
JP2009157154A (en) Optical scanner and image forming device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100412

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20111026

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20111028

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20111226

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120727

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120920

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20130614

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20130805

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20140221

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20140306

LAPS Cancellation because of no payment of annual fees