【発明の詳細な説明】［産業上の利用分野］本発明は、レーザービームプリンタ等の画像形成装置に
内蔵され、光ビームを記録媒体上に走査する走査光学装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scanning optical device that is built into an image forming apparatus such as a laser beam printer and scans a recording medium with a light beam.
［従来の技術］従来、走査光学装置内の回転多面鏡を回転するための偏
向モータの回転は、走査光学装置の外部にある制御部か
らの信号によって制御されてしするために、制御部から
の信号線をノイズが伝わり易い。更に、このノイズの他
に人体や他の機器からの静電気が偏向モータ内に入ると
、偏向モータの回転が誤動作したり電子部品が破壊され
たりする虞れが多分にある。従って、通常では偏向モー
タは金属部材によりシールドされ、この金属部材を接地
し、て、外的な静電気から保護すると共に偏向モータ内
の回転軸と軸受間で発生する静電気がチャージされるこ
とを防止している。[Prior Art] Conventionally, the rotation of a deflection motor for rotating a rotating polygon mirror in a scanning optical device has been controlled by a signal from a control section external to the scanning optical device. Noise is easily transmitted through the signal line. Furthermore, if static electricity from a human body or other equipment enters the deflection motor in addition to this noise, there is a high possibility that the rotation of the deflection motor may malfunction or electronic components may be destroyed. Therefore, the deflection motor is usually shielded by a metal member, and this metal member is grounded to protect it from external static electricity and to prevent static electricity generated between the rotating shaft and bearing inside the deflection motor from being charged. are doing.
［発明が解決しようとする課Ｂ］また、上述の構成を有する従来例においては、近年の画
像記録の高速化、細密化が進み、走査光学装置内の回転
多面鏡の回転が高速化してきたことにより、偏向モータ
内の回転軸と軸受間で発生する静電気のためや、対流の
影響などによって回転多面鏡に塵埃が付着して、反射率
が低下し画像形成装置の画像が劣化し易い、更に、偏向
モータは大きな振動を発生するが、この振動が薄い金属
部材に伝達して、金属のびびり音などの異音を含む騒音
を走査光学装置が発生するという問題点がある。[Problem B to be solved by the invention] In addition, in the conventional example having the above-mentioned configuration, the speed and precision of image recording have progressed in recent years, and the rotation of the rotating polygon mirror in the scanning optical device has become faster. As a result, dust adheres to the rotating polygon mirror due to static electricity generated between the rotating shaft and the bearing in the deflection motor, or due to the influence of convection, reducing the reflectance and easily deteriorating the image on the image forming device. Furthermore, the deflection motor generates large vibrations, and this vibration is transmitted to the thin metal member, causing the scanning optical device to generate noise including abnormal sounds such as metal chatter.
本発明の目的は、上述の従来例の欠点を解消し、偏向モ
ータを高速回転させても、回転によって生じた静電気を
ジスチャージして回転多面鏡に直埃が付着することを防
止し、また金属部材のびびり音などの異音を含む騒音を
１滅することができる走査光学装置を提供することにあ
る。An object of the present invention is to eliminate the drawbacks of the conventional example described above, and to prevent dust from directly adhering to the rotating polygon mirror by discharging static electricity generated by rotation even when the deflection motor rotates at high speed. An object of the present invention is to provide a scanning optical device that can eliminate noise including abnormal sounds such as chatter sounds of metal members.
［課題を解決するための手段］上記の目的を達成するために、本発明に係る走査光学装
置におい又は、光源から出射される光ビームを記録媒体
上に偏向走査する回転多面鏡と、該回転多面鏡を回転す
る偏向モータとを有する走査光学装置において、少なく
とも前記回転多面鏡を防振部材と一体にした導電カバー
部材により覆ったことを特徴とするものである。[Means for Solving the Problems] In order to achieve the above object, the scanning optical device according to the present invention includes a rotating polygon mirror that deflects and scans a light beam emitted from a light source onto a recording medium, and a rotating polygon mirror that deflects and scans a light beam emitted from a light source; A scanning optical device having a deflection motor that rotates a polygon mirror is characterized in that at least the rotating polygon mirror is covered with a conductive cover member integrated with a vibration isolating member.
「作用］上記の構成を有する走査光学装置は、偏向モータで発生
する静電気が回転多面鏡にチャージされることを防止す
ると共に、カバーにより回転多面鏡を防塵し、導通部劇
のびびり音などの異音を含む騒音を軽減する。``Function'' The scanning optical device having the above configuration prevents the static electricity generated by the deflection motor from being charged to the rotating polygon mirror, and also protects the rotating polygon mirror from dust with a cover, thereby eliminating chattering noises caused by conductive parts. Reduce noise including abnormal sounds.
［実施例］本発明を図示の実施、例に基づいて詳細に説明するや第１図は走査光学装置の側方から見た断面図、第２図は
一部を切欠ｌまた平面図である。光学フレーム！内には
回転多面ｍ２が設けられ、光源ンレーム１の側部に設け
られ半導体レーザーメＬ源とコリメータ１／ンズとを内
蔵する光源装置３と、この回転多面鏡２との間の光学フ
レーム１内にはシリンドリカルレンズ４が配置され、図
示し、ない記録奴体である感光体ドラムと回転多面鏡２
との間にはｆ０＃性を有する結像レンズ群５，６が配【
されている、光学フ１／−ム１の下部に設けられ、回転
多面鏡２を軸支している偏向モータ７には。[Example] The present invention will be described in detail based on illustrated embodiments and examples. Fig. 1 is a sectional view of a scanning optical device seen from the side, and Fig. 2 is a partially cutaway and plan view. . Optical frame! A rotating polygon m2 is provided inside the optical frame 1 between the light source device 3, which is provided on the side of the light source frame 1 and includes a semiconductor laser light source and a collimator 1/lens, and this rotating polygon mirror 2. A cylindrical lens 4 is arranged on the cylindrical lens 4, and a photosensitive drum which is a recording body (not shown) and a rotating polygon mirror 2 are arranged.
Imaging lens groups 5 and 6 having f0# properties are arranged between [
The deflection motor 7 is provided at the bottom of the optical frame 1 and supports the rotating polygon mirror 2.
駆動回路８の出力がコネクタ９を介して接続され、走査
光学装置の外部にある制御部１０の出力が光源装置３と
駆動回路８に接続されている、また、導電材料である金
属部材から成り接地をした筐体１２により回転多面鏡２
とシリンドリカルｌ／クズ４が覆われ、更に蓋部ｉ３に
より飲体工２を含む光学フレーム１が覆われている。筐
体１２には、光ビームを光源装Ｗ３からシリンドリカル
レンズ４に通過させる図示しない開口、及び回転多面鏡
２からの走査ビームを結像レンズ群５．６に通過させる
開口１１が設けられている。更に、筐体１２の周囲には
独立気泡を有するスポンジゴムや鉛入りのダンパ材など
から成る防振部材１４が密着されて一体化されている。The output of the drive circuit 8 is connected via a connector 9, and the output of a control unit 10 located outside the scanning optical device is connected to the light source device 3 and the drive circuit 8. The rotating polygon mirror 2 is connected to the grounded casing 12.
and the cylindrical l/waste 4 are covered, and the optical frame 1 including the drinking body 2 is further covered by the lid part i3. The housing 12 is provided with an aperture (not shown) that allows the light beam to pass from the light source unit W3 to the cylindrical lens 4, and an aperture 11 that allows the scanning beam from the rotating polygon mirror 2 to pass to the imaging lens group 5.6. . Further, a vibration isolating member 14 made of sponge rubber having closed cells, a lead-containing damper material, or the like is closely attached and integrated around the casing 12.
なお、１５は光学フレーム１に設けられ走査ビ・−ムを
感光体ドラム方向に通過させる開口である。Note that 15 is an opening provided in the optical frame 1 through which the scanning beam passes toward the photosensitive drum.
光源装Ｒ３内の半導体レーザー光源を出射した光ビー
ムは、光源装置３内のコリメータレンズによって略平行
光とされ、反射面傾斜に伴うばらつきを補正するための
シリンドリカルレンズ４を通過した後に、偏向モータ７
により駆動される回転多面鏡２によって走査ビームとさ
れ、開口１１、結像レンズ群５．６、開口１５を通過１
７て感光体ドラム上を等速で光走査する。この走査ビー
ムは画像信号に対応し、制御部１０かも送られてくる光
源装置！の半導体Ｉ／−ザーへ、のｆ１１信号と偏向モ
ータ７への回転信号によって制御され、走査ビームによ
って感光体ドラム上に形成された潜像は、既知の電子写
真プロセスで現像されて紙等に転写し定着される。Light beam emitted from the semiconductor laser light source in light source unit R3
The beam is made into approximately parallel light by a collimator lens in the light source device 3, and after passing through a cylindrical lens 4 for correcting variations due to the inclination of the reflective surface, it is sent to a deflection motor 7.
The scanning beam is converted into a scanning beam by a rotating polygon mirror 2 driven by
7, the photoreceptor drum is scanned with light at a constant speed. This scanning beam corresponds to an image signal and is also sent to the control unit 10 from the light source device! The latent image formed on the photoreceptor drum by the scanning beam is controlled by the f11 signal and the rotation signal to the deflection motor 7, and is developed by a known electrophotographic process and printed on paper, etc. Transferred and fixed.
一般には、光学フレーム１にはガラス繊維強化ポリエス
テル樹脂（ＦＲＰ）等の合成樹脂材料が使用されている
が、その理由は温度変化等の環境変化があっても、光学
フレーム呈上に設けられている回転多面鏡２、光源装置
３、シリンドリカルレンズ４、結像レンズ群５．６の位
置関係を高精度に保））シなければならず、この種の合
成樹脂材料が金ｍ等と比較して重量も軽く安価なためで
才）る。Generally, a synthetic resin material such as glass fiber reinforced polyester resin (FRP) is used for the optical frame 1, and the reason for this is that even if there are environmental changes such as temperature changes, the optical frame is The positional relationship of the rotating polygon mirror 2, light source device 3, cylindrical lens 4, and imaging lens group 5.6 must be maintained with high precision, and this type of synthetic resin material This is because it is light in weight and inexpensive.
しかし、光学フレーム１にこのような合成樹脂材料が使
用されている場合には、制御部１０から信号線を伝達し
てくるノイズや、人体や他の外部機器で発生ずる静電気
が偏向モータ７の回路内に入り込み、偏向モータ７の回
転が誤動作したり、或いは電子回路の部品が破壊された
り、回転多面鏡２に塵埃が付着して回転多面鏡２の反射
率が低下し易い、そこで、導電材料から成り接地をした
筐体１２によって回転多面鏡２を覆い、更に光学フレー
ム１を蓋部１３で覆うことにより防塵している。また、
偏向モータ７と制御部ｌＯの信号線の接続は、光学フレ
ーム１内に塵埃が入り込丈ないように光学フレーム１の
外部において駆動回路８、コネクタ９を介して接続され
ている。However, when such a synthetic resin material is used for the optical frame 1, noise transmitted through the signal line from the control unit 10 and static electricity generated by the human body or other external equipment can damage the deflection motor 7. If the dust enters the circuit, the rotation of the deflection motor 7 may malfunction, or parts of the electronic circuit may be destroyed, or dust may adhere to the rotating polygon mirror 2, reducing the reflectance of the rotating polygon mirror 2. The rotary polygon mirror 2 is covered by a grounded casing 12 made of material, and the optical frame 1 is further covered by a lid 13 to prevent dust. Also,
The signal lines of the deflection motor 7 and the control unit 1O are connected via a drive circuit 8 and a connector 9 outside the optical frame 1 to prevent dust from entering the optical frame 1.
また、光学フレーム１に固定した偏向モータ７の回転数
が高くなるにつれて、光学フレーム１の振動が大きくな
り、一般に薄い金属板から成る筐体１２、蓋部１３にそ
の振動が伝わってびびり音を発生し、更に筐体１２．光
学フレーム１で共鳴して大きな音になる。そこで、筐体
１２の周囲に設けた防振部材１４により振動を吸収し、
走査光学装置全体の騒音を軽減している。Furthermore, as the rotational speed of the deflection motor 7 fixed to the optical frame 1 increases, the vibration of the optical frame 1 increases, and the vibration is transmitted to the housing 12 and lid part 13, which are generally made of thin metal plates, causing chatter noise. occurs, and further the housing 12. It resonates in the optical frame 1 and becomes a loud sound. Therefore, the vibration is absorbed by the vibration isolating member 14 provided around the casing 12,
The noise of the entire scanning optical device is reduced.
なお、防塵効果を高めるために、必要に応じて第３図に
示すようにガラスや透明合成樹脂材刺から成るカバー１
６により筐体１２の開口１１、或いは光フレーム１の開
口１５を覆うと効果的である。In addition, in order to improve the dustproof effect, if necessary, a cover 1 made of glass or transparent synthetic resin material may be installed as shown in Figure 3.
It is effective to cover the opening 11 of the housing 12 or the opening 15 of the optical frame 1 with the opening 6.
第４図は他の実施例を示し、回転多面鏡２を軸支する偏
向モータ７′はビルトタイプや薄型の偏平モータなどと
され、光学フレーム１内に設けられており、偏向モータ
７°を保持する光学フレーム１は筐体１２、筐体１２に
密着した防振部材１４、蓋部１３により順次に覆われて
いる。制御部ｌＯの出力は信号線を光学フレーム１の内
部に導く中間コネクタ１７を介して偏向モータ７′に接
続されている。このように光学フレーム１の外部に出す
ことができないビルトタイプや偏平型の偏向モータ７゛
を使用する場合でも、偏向モータ７が外部にある先の実
施例と同様に回転多面鏡２を防塵することができる。ま
た、光学フレーム１の外部には中間コネクタ１７が露出
しているだけなので、この走査光学装置を使用するレー
ザービームプリンタ等の組立作業が容易になる。また第
５図に示すように、防振部材１８により光学フレームｌ
の下部をも覆えば、更に騒音の発生を防止することがで
きる。FIG. 4 shows another embodiment, in which the deflection motor 7' that pivotally supports the rotating polygon mirror 2 is a built-in type or a thin flat motor, and is installed inside the optical frame 1. The optical frame 1 to be held is sequentially covered by a housing 12, a vibration isolating member 14 in close contact with the housing 12, and a lid 13. The output of the control unit 10 is connected to the deflection motor 7' via an intermediate connector 17 that leads a signal line into the optical frame 1. In this way, even when using a built-in type or flat type deflection motor 7' that cannot be exposed outside the optical frame 1, the rotating polygon mirror 2 can be dust-proofed in the same manner as in the previous embodiment in which the deflection motor 7 is located outside. be able to. Further, since only the intermediate connector 17 is exposed outside the optical frame 1, assembly work of a laser beam printer or the like using this scanning optical device is facilitated. Further, as shown in FIG. 5, the optical frame l is
If the lower part of the pipe is also covered, the generation of noise can be further prevented.
なお、防振部材１４に導電性スポンジ等の導電効果を有
するものを使用すれば、筐体１２は省略することができ
る。Note that if the vibration isolating member 14 is made of a material having a conductive effect such as a conductive sponge, the housing 12 can be omitted.
［発明の効果］以上説明したように本発明に係る走査光学装置は、導電
カバー部材により回転多面鏡をシールドして制御部から
信号線を伝わってくるノイズや、人体や偏向モータの回
転で生じた静電気などがチャージすることを防止して回
転多面鏡を防塵することができるので１回転多面鏡の反
射率を一定に保持し走査画像を鮮明に保持することがで
きる。また、導電カバー部材には防振部材が一体とされ
ているので、偏向モータの回転によって生ずるびびり音
を含む騒音を軽減することができる。[Effects of the Invention] As explained above, the scanning optical device according to the present invention shields the rotating polygon mirror with the conductive cover member and prevents noise transmitted from the control unit through the signal line and caused by the rotation of the human body or the deflection motor. Since the rotary polygon mirror can be dust-proofed by preventing static electricity from being charged, the reflectance of the single-rotation polygon mirror can be kept constant and the scanned image can be maintained clearly. Further, since the vibration isolating member is integrated with the conductive cover member, it is possible to reduce noise including chatter noise caused by rotation of the deflection motor.
図面は本発明に係る走査光学装置の実施例を示し、第１
図は断面図、第２図は一部を切欠した平面図、第３図は
斜視図、第４図、第５図は他の実施例の断面図である。符号１は光学フレーム、２は回転多面鏡、３は光源装置
、７．７゛は偏向モータ、１０は制御部、１２は筐体、
１３は蓋部、１４．１８は防振部材である。The drawings show an embodiment of the scanning optical device according to the present invention, and the first
2 is a partially cutaway plan view, FIG. 3 is a perspective view, and FIGS. 4 and 5 are sectional views of other embodiments. 1 is an optical frame, 2 is a rotating polygon mirror, 3 is a light source device, 7.7゛ is a deflection motor, 10 is a control unit, 12 is a housing,
13 is a lid portion, and 14.18 is a vibration isolating member.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14440789AJPH039318A (en) | 1989-06-06 | 1989-06-06 | Scanning optical device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14440789AJPH039318A (en) | 1989-06-06 | 1989-06-06 | Scanning optical device |
| Publication Number | Publication Date |
|---|---|
| JPH039318Atrue JPH039318A (en) | 1991-01-17 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14440789APendingJPH039318A (en) | 1989-06-06 | 1989-06-06 | Scanning optical device |
| Country | Link |
|---|---|
| JP (1) | JPH039318A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4961707A (en)* | 1987-12-22 | 1990-10-09 | University Of Florida | Guided periodontal tissue regeneration |
| US5299051A (en)* | 1991-07-23 | 1994-03-29 | Asahi Kogaku Kogyo Kabushiki Kaisha | Housing structure for optical scanning system |
| JPH117180A (en)* | 1997-06-17 | 1999-01-12 | Fuji Xerox Co Ltd | Damping structural body and image forming device |
| US7599105B2 (en) | 2005-12-26 | 2009-10-06 | Ricoh Company, Ltd. | Optical scanning device and image forming apparatus wherein the position of the rotational axis of the oscillating mirror is fixed in the plane orthogonal to the torsion beam such that the rotational axis of the oscillating mirror meets the intersection point of a light beam from a light source unit and a light axis of the focusing optical system |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4961707A (en)* | 1987-12-22 | 1990-10-09 | University Of Florida | Guided periodontal tissue regeneration |
| US5299051A (en)* | 1991-07-23 | 1994-03-29 | Asahi Kogaku Kogyo Kabushiki Kaisha | Housing structure for optical scanning system |
| JPH117180A (en)* | 1997-06-17 | 1999-01-12 | Fuji Xerox Co Ltd | Damping structural body and image forming device |
| US7599105B2 (en) | 2005-12-26 | 2009-10-06 | Ricoh Company, Ltd. | Optical scanning device and image forming apparatus wherein the position of the rotational axis of the oscillating mirror is fixed in the plane orthogonal to the torsion beam such that the rotational axis of the oscillating mirror meets the intersection point of a light beam from a light source unit and a light axis of the focusing optical system |
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