JPH07128605A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH07128605A JPH07128605A JP5294404A JP29440493A JPH07128605A JP H07128605 A JPH07128605 A JP H07128605A JP 5294404 A JP5294404 A JP 5294404A JP 29440493 A JP29440493 A JP 29440493A JP H07128605 A JPH07128605 A JP H07128605A
- Authority
- JP
- Japan
- Prior art keywords
- regulating
- restriction
- shafts
- image forming
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、感光体ドラム上に潜像
を結像させるための露光手段にレーザスキャナユニット
その他の光学ユニットを用いた画像形成装置に関し、特
に前記ユニットを精度よく装置本体側に固定可能に構成
した画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using a laser scanner unit or other optical unit as an exposing means for forming a latent image on a photosensitive drum, and particularly, the above-mentioned unit is an accurate apparatus main body. The present invention relates to an image forming apparatus that can be fixed to the side.
【０００２】[0002]
【従来の技術】従来より半導体レーザ発振器により画像
情報に対応して変調させたレーザビームをポリゴンミラ
ーにより光走査しながらレンズ系を介して、感光体ドラ
ム上に結像可能に構成したレーザビームプリンタその他
の画像形成装置は公知である。2. Description of the Related Art Conventionally, a laser beam printer constructed so that a laser beam modulated in accordance with image information by a semiconductor laser oscillator can be focused on a photosensitive drum through a lens system while optically scanning with a polygon mirror. Other image forming apparatuses are known.
【０００３】この種の画像形成装置は、小形化と精度よ
い焦点精度を確保する為に前記半導体レーザ発振器、ポ
リゴンミラー、Ｆθレンズその他の光学系を一体的にユ
ニット化し、該ユニットを、感光体ドラムを装着した装
置本体側に脱着可能に装着している。In this type of image forming apparatus, the semiconductor laser oscillator, the polygon mirror, the Fθ lens and other optical systems are integrated into a unit in order to reduce the size and ensure the precise focus accuracy, and the unit is used as a photoconductor. It is detachably attached to the main body of the device on which the drum is attached.
【０００４】一般的に比較的大きな部材を保持する場合
は３箇所の保持部を基準とし保持することが最も安定す
るとするということは広く知られている。特に前記光学
ユニットの場合レーザビームがポリゴンミラーより扇状
に広がる構成を取るために、該光学ユニットを装置本体
に実装する場合、ユニットのバランス上、例えば特開平
１−２７７２５９に示すように、ポリゴンモータの後方
のユニット枠の外側に一の支持部を、又レーザビームを
感光体ドラム側に照射する照射口の左右両側のユニット
枠の外側に夫々各１箇所の支持部の計三点の支持部が配
置される。しかしながら前記の位置決め方法ではポリゴ
ンモータの後方のユニット枠の外側に支持部がある為ユ
ニットの前後方向の大きさが必要以上に大きくなり、装
置本体の小形化が阻害される。そこで例えば特開平０４
−２９１２７３において、前記光学系ユニットを直接装
置本体側に固定することなく、上面側に前記光学系ユニ
ットを装着する装着面を設けると共に、その感光体ドラ
ム軸方向両側を垂直に下方に折曲した固定台を設け、該
固定台の折曲部の両側の感光体ドラム取付け位置近傍
に、位置決め部を形成し、該位置決め部を介して前記固
定台を感光体ドラム近傍で位置決め支承した画像形成装
置を提案している。It is widely known that, in general, when holding a relatively large member, it is the most stable to hold it with three holding portions as references. In particular, in the case of the optical unit, since the laser beam spreads in a fan shape from the polygon mirror, when the optical unit is mounted on the main body of the apparatus, a polygon motor as shown in, for example, Japanese Patent Laid-Open No. 1-277259 is used in view of balance of the unit. One support part outside the unit frame at the rear of the unit, and one support part outside the unit frame on the left and right sides of the irradiation port for irradiating the laser beam to the photosensitive drum side, respectively, a total of three support parts. Are placed. However, in the above-described positioning method, since the supporting portion is provided outside the unit frame behind the polygon motor, the size of the unit in the front-rear direction becomes unnecessarily large, which hinders downsizing of the apparatus body. Therefore, for example, Japanese Patent Laid-Open No. 04-04
-291273, a mounting surface for mounting the optical system unit is provided on the upper surface side without directly fixing the optical system unit to the apparatus main body side, and both sides in the axial direction of the photosensitive drum are vertically bent downward. An image forming apparatus in which a fixing base is provided, and positioning portions are formed in the vicinity of the photosensitive drum attachment positions on both sides of the bent portion of the fixing base, and the fixing base is positioned and supported near the photosensitive drum via the positioning portions. Is proposed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながらかかる従
来技術においては、固定台を介して光学ユニットを装置
本体側に固定する構成を取るために、従来の光学ユニッ
トを直接装置本体側に固設する構成に比べ小形化の阻害
となるとともに固定台を余分に設けねばならないため
に、コストアップにつながる。However, in such a conventional technique, in order to fix the optical unit to the main body of the apparatus via the fixing base, the conventional optical unit is directly fixed to the main body of the apparatus. Compared with the above, it is difficult to reduce the size and an additional fixing base is required, which leads to an increase in cost.
【０００６】本発明はかかる従来技術の欠点に鑑み、小
形化の要請を阻害することなく、光学ユニットを直接装
置本体側に固設可能にした画像形成装置を提供すること
を目的とする。In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an image forming apparatus in which an optical unit can be directly fixed to the apparatus body side without hindering the demand for downsizing.
【０００７】[0007]
【課題を解決する為の手段】本発明は装置本体側に装着
された感光体ドラムに対し、所定距離隔てて該ドラム母
線上に潜像を書込むための光学ユニットを配設してなる
画像形成装置において、前記装置本体側の光学ユニット
底面と対峙する位置に、感光体ドラム軸と平行に夫々適
宜位置にスリット溝を設けて２本の規制軸を平行に延設
すると共に、該規制軸と対面するユニット底面側に、前
記規制軸の外径と接触して規制軸軸線方向を除く選択さ
れた一座標軸若しくは二座標軸方向（垂直方向及び規制
軸軸線と直交する軸間方向）の位置規制を行う規制手段
と、前記スリット溝の芯体部と接触することなく該スリ
ット溝に嵌合させ軸線方向のみの位置規制を行う規制手
段を設けた事を特徴とするものである。According to the present invention, an image is formed by arranging an optical unit for writing a latent image on a photoconductor drum mounted on the apparatus main body side at a predetermined distance from the drum bus line. In the forming device, slit grooves are respectively provided at appropriate positions in parallel with the photosensitive drum shaft at positions facing the bottom surface of the optical unit on the main body side of the device, and the two restricting shafts extend in parallel with each other. Position regulation of the selected one coordinate axis or two coordinate axis directions (vertical direction and axial direction orthogonal to the regulation axis line) except the regulation axis line direction by contacting with the outer diameter of the regulation shaft on the unit bottom surface facing It is characterized in that it is provided with a regulating means for carrying out the above, and a regulating means for fitting in the slit groove without contacting the core body portion of the slit groove to regulate the position only in the axial direction.
【０００８】尚、前記光学ユニットがレーザビームを偏
向器により走査可能なレーザビームユニットである画像
形成装置の場合に、一の規制軸を前記偏向器の下面側
に、他の規制軸を該偏向器の走査方向下流側に位置する
感光体ドラムと近接する側に夫々設けるのがよい。In the case of an image forming apparatus in which the optical unit is a laser beam unit capable of scanning a laser beam with a deflector, one regulating axis is directed to the lower surface side of the deflector and another regulating axis is deflected. It is advisable to provide them on the side close to the photoconductor drum located on the downstream side in the scanning direction of the container.
【０００９】[0009]
【作用】かかる技術手段によれば、例えば前記規制軸を
感光ドラムとともに精度良くドラムユニットや装置本体
に組込み、例えば光学ユニットの底面に設けたリブを利
用して規制軸外径と三点接触させる事により、点接触に
て容易に精度よく垂直方向の安定姿勢を得ることが出来
る。又前記規制軸に設けたスリット溝に嵌合する嵌合部
を光学ユニット側に設けることにより規制軸軸線方向
（χ軸）の位置規制が、さらに前記規制軸と接触するユ
ニット底面側のリブに軸間方向の規制を行う側壁を有す
る溝部を凹設することにより、垂直方向（Ｚ軸）の位置
規制が夫々行うことが出来る。そして前記規制部の内、
軸線方向の規制手段はスリット溝に嵌合するが前記スリ
ット溝の芯体部と接触することなく該スリット溝に嵌合
させるものであるから、夫々他のＹ、Ｚ軸方向、即ち軸
間方向と垂直方向の規制手段に干渉されることなく独立
して精度よく位置規制を行なう事が出来る。又前記規制
軸の外径と接触して軸線方向（χ軸）を除く選択された
垂直方向若しくは軸間方向の位置規制を行う規制手段が
規制軸の外径に接触する規制手段であるために軸線方向
に自由度を有し、前記軸線方向の規制手段の規制手段に
干渉されることなく独立して精度よく位置規制を行なう
事が出来る。尚、この規制手段は本実施例のように二元
方向を一の規制手段で規制してもよく、又垂直方向と軸
間方向を夫々個別に規制するように構成してもよい。又
前記規制軸を偏向器の下面側とその走査方向下流側に位
置する感光体ドラムと近接する側に夫々配設する事によ
り、偏向器の後方のユニット枠の外側に支持部を設ける
ことなく、光学ユニットの前後方向に支持部を設ける必
要がなく、装置本体の小形化が容易に達成される。According to such a technical means, for example, the regulating shaft together with the photosensitive drum can be accurately incorporated in the drum unit or the main body of the apparatus and, for example, the rib provided on the bottom surface of the optical unit can be used to make three-point contact with the outer diameter of the regulating shaft. Thus, it is possible to easily and accurately obtain a stable posture in the vertical direction by point contact. Further, by providing a fitting portion that fits into the slit groove provided on the regulation shaft on the optical unit side, the position regulation in the regulation axis direction (χ axis) is further performed on the rib on the unit bottom surface side that comes into contact with the regulation shaft. By recessing the groove portion having the side wall for regulating in the inter-axis direction, it is possible to respectively regulate the position in the vertical direction (Z axis). And in the regulation section,
The axial restricting means is fitted in the slit groove but fitted in the slit groove without coming into contact with the core body portion of the slit groove. The position can be regulated independently and accurately without being interfered by the vertical regulating means. Further, since the restricting means for contacting with the outer diameter of the restricting shaft and restricting the position in the selected vertical direction or the axial direction except the axial direction (χ axis) is the restricting means contacting with the outer diameter of the restricting shaft. It has a degree of freedom in the axial direction, and can independently and accurately regulate the position without being interfered by the regulating means of the regulating means in the axial direction. The restricting means may restrict the dual direction by one restricting means as in the present embodiment, or may restrict the vertical direction and the axial direction individually. Further, by disposing the restricting shafts on the lower surface side of the deflector and on the side close to the photosensitive drum located on the downstream side in the scanning direction, respectively, without providing a supporting portion outside the unit frame behind the deflector. Since it is not necessary to provide a support portion in the front-rear direction of the optical unit, downsizing of the device body can be easily achieved.
【００１０】更に前記両規制軸の軸線と直交する軸間方
向の規制位置の位置保持を行うために、前記夫々の規制
軸が位置する光学ユニットの左右両側に、前記規制軸の
外径を一方向に押圧しながらテーパ状に把持する保持手
段を設けて固定する事により前記位置規制部が夫々精度
よく固定することが出来る。この場合、前記保持手段は
規制軸に対応させて光学ユニットの左右両側に設ける事
が出来るために、ユニットの前後方向の寸法を必要最小
限にできるという前記効果を得ることが出来ると共に、
偏向器の左右の保持にはテーパ部で保持する保持具を用
いるので、保持部分の精度はさほど必要せず且つ余分な
負荷がかからず、光学ユニットにゆがみが出にくい。Further, in order to maintain the position of the restriction position in the inter-axis direction orthogonal to the axes of the both restriction shafts, the outer diameters of the restriction shafts are set to the left and right sides of the optical unit where the respective restriction shafts are located. By providing and fixing the holding means for grasping in a tapered shape while pressing in the direction, each of the position restricting portions can be fixed with high accuracy. In this case, since the holding means can be provided on both the left and right sides of the optical unit corresponding to the regulation axis, it is possible to obtain the above effect that the size of the unit in the front-rear direction can be minimized.
Since a holder for holding the deflector on the left and right is used with a tapered portion, the accuracy of the holding portion is not required so much, an extra load is not applied, and the optical unit is less likely to be distorted.
【００１１】[0011]
【実施例】以下、図面に基づいて本発明の実施例を例示
的に詳しく説明する。但しこの実施例に記載されている
構成部品の寸法、材質、形状、その相対配置などは特に
特定的な記載がない限りは、この発明の範囲をそれのみ
に限定する趣旨ではなく単なる説明例に過ぎない。Embodiments of the present invention will now be illustratively described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely examples, unless otherwise specified. Not too much.
【００１２】図１乃至図５は本発明の実施例に係るレー
ザプリンタ本体に組込まれるレーザスキャナユニットを
示し、図１及び図２に示すように、前記スキャナユニッ
ト１はポリゴンミラー取り付け部より扇状に形成された
ユニットハウジング１０の平面部に、半導体レーザ発振
器１１、コリメートレンズ１２、ポリゴンミラー１３、
第１及び第２のＦθレンズ１４、１５、第１及び第２の
変向ミラー１６、１７が取り付けられており、半導体レ
ーザ発振器１１より発振された変調レーザは、コリメー
トレンズ１２を介して平行ビームをポリゴンミラー１３
により主走査方向に光走査した後、第１及び第２のＦθ
レンズ１４、１５及び第１及び第２の偏向ミラー１６、
１７を介してドラムユニット２に組込まれた感光体ドラ
ム２１の母線上に露光像を書込むように構成されてい
る。前記ドラムユニット２内のフレーム２０には感光ド
ラム２１と位置精度が管理されているシャフト取付け孔
２２にインローで取付られた規制軸４が、又不図示の本
体フレームには前記規制軸と平行に規制軸５が夫々光学
ユニット１の下面に精度よく延設されており、又前記規
制軸５、４はポリゴンミラー１３の下面と第２のＦθレ
ンズ１５の下面側に位置するように延設するとともに規
制軸４についてはその中央位置にスリット溝４ｂを削成
する。1 to 5 show a laser scanner unit incorporated in a laser printer body according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the scanner unit 1 is fan-shaped from a polygon mirror mounting portion. A semiconductor laser oscillator 11, a collimator lens 12, a polygon mirror 13,
The first and second Fθ lenses 14 and 15 and the first and second deflection mirrors 16 and 17 are attached, and the modulated laser oscillated by the semiconductor laser oscillator 11 is collimated through the collimator lens 12. The polygon mirror 13
After the optical scanning in the main scanning direction by the first and second Fθ
Lenses 14, 15 and first and second deflection mirrors 16,
An exposure image is written on the generatrix of the photoconductor drum 21 incorporated in the drum unit 2 via 17. The frame 20 in the drum unit 2 has a photosensitive drum 21 and a regulating shaft 4 attached by a spigot to a shaft mounting hole 22 whose position accuracy is controlled, and a body frame (not shown) is regulated in parallel with the regulating shaft. The shafts 5 are accurately extended to the lower surface of the optical unit 1, and the restriction shafts 5 and 4 are extended so as to be located on the lower surface of the polygon mirror 13 and the lower surface of the second Fθ lens 15. A slit groove 4b is formed at the central position of the regulation shaft 4.
【００１３】一方前記スキャナユニット１の底面には補
強のための各種リブが形成されており、図１及び図３に
示すように規制軸４と対応する、第２のＦθレンズ１５
の左右両側の左端部及び右端部に位置するリブ３１Ａ及
び３１Ｂにはユニット１の前後方向（Ｙ軸）と垂直方向
（Ｚ軸）の位置決めをする為に、図５（Ｂ）に示すよう
に下側が開口された門型状凹部３１１が、又中央部のリ
ブ３２には左右方向の位置決めをする下向きＵ字状の凹
部３２１が夫々設けられ、規制軸４の中央スリット溝４
ｂに前記凹部３２１が嵌合するように構成する。この
際、図５（Ａ）に示すように、Ｕ字状の凹部３２１径
は、規制軸４の外径より小さく且つスリット溝４ｂの芯
体４ａ外径より大きくし、該Ｕ字状の凹部３２１が芯体
４ａ外径に直接接触しないように設定する。この結果、
Ｕ字状の凹部３２１ではスリット溝芯体４ａに対し、垂
直方向と軸間方向に対し遊びを以て嵌合される事になる
ために規制軸方向（χ軸方向）に対してのみ位置規制さ
れる。又左右端に設けた凹部３１１は規制軸４外径と嵌
合しているために、規制軸方向（χ軸方向）に対しては
自由度があり、軸間方向（Ｙ軸）及び垂直方向（Ｚ軸）
方向の位置規制が行われる。一方、規制軸５と対応す
る、ポリゴンミラー１３取り付け位置と対応するスキャ
ナユニット１の底面付近には、規制軸５に突き当てて上
下方向のみの位置決めをするリブ３３が設けてある。On the other hand, various ribs for reinforcement are formed on the bottom surface of the scanner unit 1, and as shown in FIGS. 1 and 3, the second Fθ lens 15 corresponding to the regulation shaft 4 is formed.
As shown in FIG. 5 (B), the ribs 31A and 31B located on the left and right ends on both the left and right sides of the unit 1 are positioned to position the unit 1 in the front-rear direction (Y axis) and in the vertical direction (Z axis). A gate-shaped recess 311 having an opening on the lower side and a downward U-shaped recess 321 for positioning in the left-right direction are provided in the central rib 32, respectively.
The concave portion 321 is configured to be fitted in b. At this time, as shown in FIG. 5A, the diameter of the U-shaped recess 321 is smaller than the outer diameter of the regulation shaft 4 and larger than the outer diameter of the core body 4a of the slit groove 4b, and the U-shaped recess 321 is formed. It is set so that 321 does not directly contact the outer diameter of the core body 4a. As a result,
In the U-shaped recess 321, the slit groove core body 4a is fitted with play in the vertical direction and the axial direction, so that the position is restricted only in the restriction axis direction (χ axis direction). . Further, since the recesses 311 provided on the left and right ends are fitted with the outer diameter of the regulation shaft 4, there is a degree of freedom in the regulation axis direction (χ axis direction), and the inter-axis direction (Y axis) and the vertical direction. (Z axis)
Directional position regulation is performed. On the other hand, near the bottom surface of the scanner unit 1 corresponding to the mounting position of the polygon mirror 13 corresponding to the regulation shaft 5, there is provided a rib 33 that abuts on the regulation shaft 5 and positions only in the vertical direction.
【００１４】一方スキャナユニット１と規制軸間を固定
する保持具８は、前記ユニット１の前記凹部３１１とポ
リゴンミラー１３取り付け部位の夫々左右端側に設けた
平面部１８、１９に夫々ネジ９を介して取り付けられて
おり、そして該保持具８は略断面横Ｊ字状をなし、前記
規制軸と嵌合するテーパ部８２とネジ９に対して取り付
け位置調整用の長穴８１とが設けられている。そしてテ
ーパ部８２を各規制軸４及び５に軸間の前方向に向けて
突き当ててネジ９にてスキャナユニット１を固定保持す
る。尚この保持治具８のテーパ部８２の狭角は直角に近
い設定をすると、保持力が低下し、逆に０度に近い設定
をすると、調整代が多く必要になる。よってこのテーパ
部fの角度は４５°±２０°が好ましい。On the other hand, the holder 8 for fixing between the scanner unit 1 and the regulating shaft is provided with screws 9 on flat portions 18 and 19 provided on the left and right ends of the concave portion 311 of the unit 1 and the polygon mirror 13 attachment portion, respectively. The holder 8 has a substantially horizontal J-shape in cross section, and is provided with a taper portion 82 that fits with the regulation shaft and an elongated hole 81 for adjusting a mounting position with respect to the screw 9. ing. Then, the tapered portion 82 is abutted against each of the restriction shafts 4 and 5 in the forward direction between the shafts, and the scanner unit 1 is fixedly held by the screw 9. Note that if the narrow angle of the taper portion 82 of the holding jig 8 is set to be close to a right angle, the holding force will be reduced, and conversely, if it is set to be close to 0 degree, a large adjustment allowance will be required. Therefore, the angle of the tapered portion f is preferably 45 ° ± 20 °.
【００１５】この結果、レーザビームスキャナユニット
１は垂直方向に対しては前記凹部３１１とリブ３３によ
り垂直方向に対して３点支持により安定した姿勢を得る
事が出来る。又規制軸４、５の軸線方向についてはＵ字
状の凹部３２１とスリット溝４ｂとの嵌合により、更に
軸間方向に対しては保持治具８により１方向に規制軸４
を押し当てながら凹部３１１の一側面により夫々位置規
制されているために、精度よい位置固定が可能となる。
従ってかかる実施例によればポリゴンモータ１３の後方
でユニット１の外側に保持治具がないため、ユニット１
の前後方向の寸法を必要最小限にできる。又ポリゴンモ
ータ１３の左右の保持には保持治具８のテーパ部８２で
規制軸４を一方向に押し当てながら保持する保持治具８
を用いているので、保持部分の精度はさほど必要しない
のみならず規制軸４による点接触の為に、余分な負荷が
かからず、ユニット１にゆがみが出にくい。As a result, the laser beam scanner unit 1 can obtain a stable attitude in the vertical direction by supporting the three points in the vertical direction by the recess 311 and the rib 33. Further, with respect to the axial direction of the restriction shafts 4 and 5, the U-shaped concave portion 321 and the slit groove 4b are fitted to each other.
Since the positions are regulated by the one side surface of the concave portion 311 while pressing against, it is possible to fix the position accurately.
Therefore, according to such an embodiment, since there is no holding jig outside the unit 1 behind the polygon motor 13, the unit 1
The dimension in the front-back direction can be minimized. Further, for holding the polygon motor 13 to the left and right, the holding jig 8 holds the regulating shaft 4 while pressing it in one direction with the tapered portion 82 of the holding jig 8.
Therefore, the accuracy of the holding portion is not so much required, and since the point contact by the regulating shaft 4 does not apply an extra load, the unit 1 is less likely to be distorted.
【００１６】[0016]
【効果】以上記載したごとく本発明は感光ドラムととも
に精度良くドラムユニットや装置本体に組込んだ規制軸
を利用して、点接触にて三点接触させる事により、容易
に精度よく垂直方向の安定姿勢を得ることが出来る。又
本発明は規制軸外径や規制軸に設けたスリット溝を利用
して軸軸線方向とともに軸間方向の位置規制も容易に行
うことが出来、これにより本発明によれば、小形化の要
請を阻害することなく、光学ユニットを直接装置本体側
に精度よく固設する事が出来る。等の種々の著効を有
す。[Effects] As described above, the present invention makes it possible to easily and accurately make a stable posture in the vertical direction by accurately contacting the photosensitive drum with the regulating shaft incorporated in the drum unit or the main body of the apparatus to make three point contact. Can be obtained. Further, according to the present invention, it is possible to easily perform position regulation not only in the axial direction but also in the axial direction by utilizing the outer diameter of the regulation shaft and the slit groove provided in the regulation shaft. The optical unit can be directly and accurately fixed to the main body of the apparatus without disturbing the above. It has various remarkable effects.
【図１】本発明の実施例に係る光学ユニットの平面図で
ある。FIG. 1 is a plan view of an optical unit according to an embodiment of the present invention.
【図２】図１の中央断面正面図である。FIG. 2 is a front view of the center cross section of FIG.
【図３】図１の正面図である。FIG. 3 is a front view of FIG.
【図４】ポリゴンミラー側の規制軸との関係を示す側面
図である。FIG. 4 is a side view showing a relationship with a regulation axis on a polygon mirror side.
【図５】ドラムユニット側の規制軸との関係を示す側面
図である。FIG. 5 is a side view showing a relationship with a restriction shaft on the drum unit side.
１４、１５ 第２のＦθレンズ ２ ドラムユニット １ 光学ユニット ５、４ 規制軸 １３ ポリゴンミラー １５ 第２のＦθレンズ ４ｂ スリット溝 ３２１ Ｕ字状の凹部 14, 15 Second Fθ lens 2 Drum unit 1 Optical unit 5, 4 Restriction axis 13 Polygon mirror 15 Second Fθ lens 4b Slit groove 321 U-shaped concave portion
Claims (3)
対し、所定距離隔てて該ドラム母線上に潜像を書込むた
めの光学ユニットを配設してなる画像形成装置におい
て、 前記装置本体側の光学ユニット底面と対峙する位置に、
感光体ドラム軸と平行に夫々適宜位置にスリット溝を設
けて２本の規制軸を平行に延設すると共に、該規制軸と
対面するユニット底面側に、前記規制軸の外径と接触し
て規制軸軸線方向を除く選択された一座標軸若しくは二
座標軸方向の位置規制を行う規制手段と、前記スリット
溝の芯体部と接触することなく該スリット溝に嵌合させ
軸線方向のみの位置規制を行う規制手段を設けた事を特
徴とする画像形成装置1. An image forming apparatus in which an optical unit for writing a latent image on a drum bus is arranged at a predetermined distance from a photosensitive drum mounted on the apparatus main body, wherein the apparatus main body is provided. At the position facing the bottom of the side optical unit,
Slit grooves are provided at appropriate positions in parallel with the photosensitive drum axis to extend the two regulating shafts in parallel with each other, and the unit bottom surface facing the regulating shaft is in contact with the outer diameter of the regulating shaft. Restriction axis A restriction means for restricting the position of the selected one coordinate axis or two coordinate axes except the axial direction, and a position restriction in the axial direction only by fitting the slit groove into the slit groove without contacting the core body portion. An image forming apparatus characterized in that a regulation means for performing the same is provided.
器により走査可能なレーザビームユニットである画像形
成装置において、一の規制軸を前記偏向器の下面側に、
他の規制軸を該偏向器の走査方向下流側に位置する感光
体ドラムと近接する側に夫々設けた事を特徴とする請求
項１記載の画像形成装置2. An image forming apparatus in which the optical unit is a laser beam unit capable of scanning a laser beam with a deflector, and one regulating axis is provided on a lower surface side of the deflector.
2. The image forming apparatus according to claim 1, wherein the other regulating shafts are provided on the respective sides adjacent to the photoconductor drums located on the downstream side of the deflector in the scanning direction.
の規制位置の位置保持を行うために、前記夫々の規制軸
が位置する光学ユニットの左右両側に、前記規制軸の外
径を一方向に押圧しながらテーパ状に把持する保持手段
を設けた事を特徴とする請求項２記載の画像形成装置3. The outer diameter of the restriction shaft is provided on both left and right sides of an optical unit in which the respective restriction shafts are located in order to maintain the position of the restriction position in the inter-axis direction orthogonal to the axes of the both restriction shafts. 3. The image forming apparatus according to claim 2, further comprising a holding means for holding the tape in a tapered shape while pressing it in one direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5294404A JPH07128605A (en) | 1993-10-29 | 1993-10-29 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5294404A JPH07128605A (en) | 1993-10-29 | 1993-10-29 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07128605A true JPH07128605A (en) | 1995-05-19 |
Family
ID=17807306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5294404A Pending JPH07128605A (en) | 1993-10-29 | 1993-10-29 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07128605A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006323157A (en) * | 2005-05-19 | 2006-11-30 | Sharp Corp | Optical scanner and image forming apparatus |
-
1993
- 1993-10-29 JP JP5294404A patent/JPH07128605A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006323157A (en) * | 2005-05-19 | 2006-11-30 | Sharp Corp | Optical scanner and image forming apparatus |
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