JP2922083B2 - Rotating polygon mirror drive - Google Patents
Rotating polygon mirror driveInfo
- Publication number
- JP2922083B2 JP2922083B2 JP8299193A JP8299193A JP2922083B2 JP 2922083 B2 JP2922083 B2 JP 2922083B2 JP 8299193 A JP8299193 A JP 8299193A JP 8299193 A JP8299193 A JP 8299193A JP 2922083 B2 JP2922083 B2 JP 2922083B2
- Authority
- JP
- Japan
- Prior art keywords
- polygon mirror
- rotary polygon
- wall
- rotor
- driving device
- 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
Links
Landscapes
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Motor Or Generator Frames (AREA)
- Dot-Matrix Printers And Others (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はＯＡ分野等に使用される
回転多面鏡駆動装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary polygon mirror driving device used in the OA field and the like.
【０００２】[0002]
【従来の技術】近年、複写機やレーザービームプリンタ
はデジタル化，高速化が進んでおり、それに使用される
レーザースキャナーユニット（以下、Ｌ．Ｓ．Ｕと略
す。）も高精度が要求されているが、反面、低コスト化
の要求もきびしくなってきており、特に回転多面鏡を駆
動する回転多面鏡駆動装置に低コスト化の比重が大きく
かかっている。2. Description of the Related Art In recent years, digital copying machines and laser beam printers have been digitized and speeded up, and a laser scanner unit (hereinafter abbreviated as LSU) used therein has been required to have high accuracy. However, on the other hand, the demand for cost reduction has also become severe, and in particular, the cost of the cost reduction has been particularly high for a rotary polygon mirror driving device that drives a rotary polygon mirror.
【０００３】通常、ロータの回転多面鏡取り付け部を自
駆動もしくは外部駆動等で切削や研磨を行い、動的面倒
れの精度向上を行うとともにＬ．Ｓ．Ｕ内部に面倒れ補
正レンズを設けることが多く、動的面倒れの加工精度が
向上するほど面倒れ補正レンズが省略できることにな
る。[0003] Usually, the rotary polygon mirror mounting portion of the rotor is cut or polished by self-drive or external drive, etc., to improve the accuracy of dynamic surface tilt and to improve the L.R. S. In many cases, a surface tilt correction lens is provided inside U, and the surface tilt correction lens can be omitted as the processing accuracy of dynamic surface tilt is improved.
【０００４】しかしながら、実際はロータの軸受のクリ
アランス等によりロータは必ずしも同じ回転の軌跡を通
らず、いわゆる非繰り返し振れ誤差のため動的面倒れの
加工精度が向上しても面倒れ補正レンズが省略できない
場合が多い。However, in practice, the rotor does not always follow the same locus of rotation due to the clearance of the bearing of the rotor, etc., and the so-called non-repetitive run-out error does not eliminate the face-fall correction lens even if the processing accuracy of the dynamic face-fall is improved. Often.
【０００５】このような非繰り返し振れ誤差をおさえる
ため、軸受部に側圧を加える等の方法がとられている。[0005] In order to suppress such non-repetitive runout errors, a method of applying a lateral pressure to a bearing portion or the like has been adopted.
【０００６】以下に、従来の回転多面鏡駆動装置につい
て説明する。図３は従来の回転多面鏡駆動装置の一例を
示すものである。図３において、ロータボス２にシャフ
ト１が嵌合固定されており、回転多面鏡３が押え板４を
用いてネジ等（図示しない）で固定されている。また、
ロータボス２にはマグネット５が取り付けられ、ブラケ
ット６のマグネット５と対向した位置にステータ７が取
り付けられている。さらに、ブラケット６およびブラケ
ットカバー８にはそれぞれ玉軸受９および玉軸受１０が
装着されており、ジャフト１を回転自在に軸支してい
る。またバネ１１にて玉軸受９および玉軸受１０に予圧
を与え、さらにゴム１２で側圧を与えている。A conventional rotary polygon mirror driving device will be described below. FIG. 3 shows an example of a conventional rotary polygon mirror driving device. In FIG. 3, a shaft 1 is fitted and fixed to a rotor boss 2, and a rotary polygon mirror 3 is fixed with screws (not shown) using a holding plate 4. Also,
A magnet 5 is mounted on the rotor boss 2, and a stator 7 is mounted on the bracket 6 at a position facing the magnet 5. Further, a ball bearing 9 and a ball bearing 10 are mounted on the bracket 6 and the bracket cover 8, respectively, and rotatably support the jaft 1. A spring 11 applies a preload to the ball bearings 9 and 10, and a rubber 12 applies a side pressure.
【０００７】以上のように構成された回転多面鏡駆動装
置について、以下その動作について説明する。まず、ス
テータ７の駆動巻線に電流が流れ、マグネット５との間
で駆動力が発生し、シャフト１とともに回転多面鏡３が
回転を始めスキャニングを行う。このとき、ゴム１２に
よる側圧により非繰り返し振れ誤差をおさえて回転多面
鏡３の回転時の光軸ズレをおさえている。[0007] The operation of the rotary polygon mirror driving device constructed as described above will be described below. First, a current flows through the drive winding of the stator 7 to generate a driving force between the magnet 5 and the rotating polygon mirror 3 starts rotating together with the shaft 1 to perform scanning. At this time, the non-repetitive shake error is suppressed by the lateral pressure by the rubber 12, and the optical axis shift during rotation of the rotary polygon mirror 3 is suppressed.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら上記従来
の構成では、上下軸受がこじれた状態で組立なければな
らないので組立が複雑でむずかしく、軸受寿命を縮め、
特に軸受の音響寿命を悪化させるとともに工程不良を増
大させる。また、組み立てた後に側圧を加えるという方
式をとると側圧の調整に膨大なコストがかかるという問
題点を有していた。However, in the above-mentioned conventional construction, since the upper and lower bearings must be assembled in a twisted state, the assembly is complicated and difficult, and the life of the bearing is shortened.
In particular, it degrades the acoustic life of the bearing and increases process defects. In addition, if a method of applying a lateral pressure after assembling is adopted, there is a problem in that a huge cost is required for adjusting the lateral pressure.
【０００９】本発明は上記従来の問題点を解決するもの
で、組み立てが容易で工程不良を減少させ軸受寿命を伸
ばし、低コストで回転時の非繰り返し振れ誤差をおさえ
た回転精度の高い優れた回転多面鏡駆動装置を提供する
ことを目的とする。The present invention solves the above-mentioned conventional problems. It is easy to assemble, reduces the number of process defects, extends the life of the bearing, and is low cost and suppresses non-repetitive run-out errors during rotation. It is an object to provide a rotary polygon mirror driving device.
【００１０】[0010]
【課題を解決するための手段】この目的を達成するため
に本発明の回転多面鏡駆動装置は、ロータ組立と、前記
ロータ組立の回転部材のラジアル方向外周に対向した位
置に外壁を設け、前記外壁内周面を構成する中心軸をロ
ータ組立の回転中心軸に対して偏心させ、回転部材と外
壁内周間に圧力差を生じるような部分的な空隙差を設
け、前記回転部材上のラジアル方向外周上に歯車状もし
くは、角柱状の少なくとも１個以上の凹凸部を備えた構
成であるか、または、凹凸部を回転多面鏡で構成する
か、または、前記空隙差を外壁内周面の一部に少なくと
も１個以上の凹部または、凸部で構成するか、または、
前記回転多面鏡の鏡面に対向した光走査窓部を空隙の広
い部分と兼用させた構成を有する者である。 In order to achieve this object, a rotary polygon mirror driving device according to the present invention comprises a rotor assembly ,
An outer wall is provided at a position facing the radially outer periphery of the rotating member of the rotor assembly, and a central axis constituting the inner peripheral surface of the outer wall is rotatable.
Eccentric to the rotation center axis of the motor assembly, and
A partial gap difference is created to create a pressure difference between the inner circumference of the wall.
Gears on the radially outer periphery of the rotating member.
In other words, a structure provided with at least one
Or the uneven part is composed of a rotating polygon mirror
Or, the gap difference is at least part of the inner peripheral surface of the outer wall.
Is also composed of one or more concave or convex, or
The optical scanning window opposing the mirror surface of the rotating polygon mirror has a wide gap.
Person who has a configuration that is also used as a part.
【００１１】[0011]
【作用】この構成によれば、ロータの回転部材と外壁間
に部分的な空隙差を設けることによりロータの回転時に
発生する風圧を用い、空隙差による圧力差をおこさせロ
ータに側圧を加え、回転時の非繰り返し振れ誤差をおさ
えることができる。According to this structure, by providing a partial gap difference between the rotating member of the rotor and the outer wall, a wind pressure generated at the time of rotation of the rotor is used to cause a pressure difference due to the gap difference to apply a side pressure to the rotor. Non-repetitive run-out errors during rotation can be suppressed.
【００１２】[0012]
（実施例１）以下本発明の一実施例について、図面を参
照しながら説明する。なお、従来の回転多面鏡駆動装置
と同一の構成，構造のものについては説明を省略する。(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. The description of the same configuration and structure as those of the conventional rotary polygon mirror driving device is omitted.
【００１３】図１において、回転多面鏡３に対向するブ
ラケット６の内周面の中心軸と回転多面鏡３の回転中心
軸に対して偏心量εを与え、回転多面鏡３の外周とブラ
ケット６の内周間の空隙δ１および、δ２（δ１＞δ
２）を与えている。In FIG. 1, an eccentricity ε is given to the center axis of the inner peripheral surface of the bracket 6 facing the rotary polygon mirror 3 and the center axis of rotation of the rotary polygon mirror 3, and the outer circumference of the rotary polygon mirror 3 and the bracket 6 Δ1 and δ2 (δ1> δ) between the inner circumferences of
2) is given.
【００１４】以上のように構成された回転多面鏡駆動装
置について、その動作を説明する。まず、ロータが回転
を始めると回転多面鏡３の外周に沿って空気の流れが発
生し、空隙δ１およびδ２に圧力が発生する。この時、
空隙δ２が空隙δ１より狭いため空隙δ２に発生する圧
力は空隙δ１に発生する圧力より大きくなり、ロータを
一定方向（矢印Ｃの方向）に押して側圧を加えている。
通常、このような圧力は空隙の大きさの３乗に反比例す
ることが知られており、空隙が小さいほど膨大な圧力が
発生する。また回転数にも比例するので回転数が速いほ
ど圧力は大きくなる。The operation of the rotary polygon mirror driving device configured as described above will be described. First, when the rotor starts rotating, an air flow is generated along the outer periphery of the rotary polygon mirror 3, and pressure is generated in the gaps δ1 and δ2. At this time,
Since the gap δ2 is smaller than the gap δ1, the pressure generated in the gap δ2 is larger than the pressure generated in the gap δ1, and the rotor is pushed in a certain direction (the direction of arrow C) to apply the side pressure.
It is generally known that such pressure is inversely proportional to the cube of the size of the gap, and the smaller the gap, the more pressure is generated. Since the pressure is proportional to the rotation speed, the pressure increases as the rotation speed increases.
【００１５】以上のように、本実施例によれば回転多面
鏡３の回転中心軸とブラケット６の内周面の中心軸とを
偏心させ、部分的な空隙差を設けることにより回転時の
圧力差によるロータへの側圧を加えることができる。As described above, according to the present embodiment, the rotation center axis of the rotary polygon mirror 3 and the center axis of the inner peripheral surface of the bracket 6 are decentered, and a partial gap difference is provided to thereby increase the pressure during rotation. Side pressure on the rotor due to the difference can be applied.
【００１６】（実施例２）以下本発明の第２の実施例に
ついて、図面を参照しながら説明する。(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
【００１７】図２において、図１の構成と異なるのは回
転多面鏡３の回転中心軸とブラケット６の内周面の中心
軸とを偏心させ、部分的な空隙差を設けるということを
ブラケット６の内周面に凸部６ａおよび凹部６ｂを設
け、同様の空隙差を実現させた点である。当然、第１の
実施例と同様の機能を果たすということはいうまでもな
い。In FIG. 2, the difference from the configuration of FIG. 1 is that the center axis of rotation of the rotary polygon mirror 3 and the center axis of the inner peripheral surface of the bracket 6 are decentered to provide a partial gap difference. Are provided with a convex portion 6a and a concave portion 6b on the inner peripheral surface thereof, thereby realizing a similar gap difference. It goes without saying that the same function as in the first embodiment is performed.
【００１８】なお第１の実施例および第２の実施例にお
いて、空隙差は回転多面鏡３とブラケット６間に設けた
が、ロータボス２とブラケット６間や押え板４とブラケ
ットカバー８間に設けてもよく、さらにロータボス２や
押え板４の外周を回転多面鏡と同様の角柱状にしたり歯
車状にしたりすると、風量が増えてさらに大きな風圧を
得ることができる。また、たとえロータボス２や押え板
４の外周が円柱状であっても空隙を十分に小さくした
り、回転数を速くしたりすると十分に機能させることが
できる。In the first embodiment and the second embodiment, the gap is provided between the rotary polygon mirror 3 and the bracket 6, but is provided between the rotor boss 2 and the bracket 6 or between the holding plate 4 and the bracket cover 8. If the outer periphery of the rotor boss 2 or the holding plate 4 is formed in a prismatic shape or a gear shape similar to that of the rotary polygon mirror, the air volume is increased and a larger wind pressure can be obtained. Further, even if the outer periphery of the rotor boss 2 or the holding plate 4 is cylindrical, it can function sufficiently if the gap is made sufficiently small or the rotation speed is increased.
【００１９】また玉軸受の例を示したが、焼結含油軸受
やヘリングボーン溝やスパイラル溝等で構成された動圧
軸受でもよい。Although an example of a ball bearing has been described, a sintered oil-impregnated bearing or a hydrodynamic bearing constituted by a herringbone groove, a spiral groove or the like may be used.
【００２０】また、回転多面鏡とブラケット間の空隙の
広い部分にブラケットの光走査窓を兼用させた例を示し
たが、特に兼用しなくても十分に機能させることは空隙
の調整等を行うことにより可能である。Also, an example has been shown in which the optical scanning window of the bracket is also used for a wide portion of the gap between the rotating polygon mirror and the bracket. However, even if the optical scanning window is not shared, it is necessary to adjust the gap. This is possible.
【００２１】また、ロータの両端に軸受を設けた両持ち
支持型の構造例を示したが、回転多面鏡やマグネットが
軸受の外側に位置したような片持ち支持型でもよい。ま
た、インナーロータ型の構造例を示したが、アウターロ
ータ型や平面対向型でも同様の効果を得ることができる
のはいうまでもない。In addition, although the example of the structure of the two-sided support type in which bearings are provided at both ends of the rotor has been described, a cantilevered type in which a rotating polygon mirror or a magnet is located outside the bearing may be used. In addition, although the example of the structure of the inner rotor type has been described, it is needless to say that the same effect can be obtained with the outer rotor type or the flat facing type.
【００２２】なお第２の実施例において、凸部および凹
部はそれぞれ１カ所ずつ設けたが、２カ所以上設けてベ
クトル合成してもよく、また凸部および凹部のどちらか
一方だけでも空隙を十分に小さくしたり、回転数が速い
場合などには十分に機能させることができる。In the second embodiment, one convex portion and one concave portion are provided, respectively, but two or more convex portions and concave portions may be provided for vector synthesis. In other words, when the rotation speed is high, it can function sufficiently.
【００２３】[0023]
【発明の効果】以上のように本発明は、ロータ組立の回
転部材のラジアル方向外周に対向した位置に外壁を有し
た構成であり、外壁内周面とロータ組立の中心軸を偏心
させるか、または外壁内周面の一部に少なくとも１個以
上の凹部または凸部を設けるかして、回転部材と外壁内
周間に部分的な空隙差を設けることにより、ロータの回
転時に発生する風圧で空隙差による圧力差をおこさせ、
ロータに側圧を加え回転時の非繰り返し振れ誤差をおさ
えることができる。As described above, the present invention has a structure in which an outer wall is provided at a position opposed to a radially outer periphery of a rotating member of a rotor assembly. Alternatively, by providing at least one or more concave portions or convex portions on a part of the inner peripheral surface of the outer wall, or by providing a partial gap difference between the rotating member and the inner peripheral surface of the outer wall, the wind pressure generated when the rotor rotates can be reduced. Causing a pressure difference due to the air gap,
By applying lateral pressure to the rotor, non-repetitive runout errors during rotation can be suppressed.
【００２４】また、Ｌ．Ｓ．Ｕに至っては内部に設ける
面倒れ補正レンズが省略でき、Ｌ．Ｓ．Ｕの低コスト化
が実現できる。さらに従来の側圧を加える構造に比べ、
構造が簡単で軸受をこじるようなことがなく、信頼性に
優れた回転多面鏡駆動装置を実現できるものである。Further, L. S. In the case of U.U., the surface tilt correction lens provided inside can be omitted. S. Cost reduction of U can be realized. Furthermore, compared to the conventional structure that applies lateral pressure,
It is possible to realize a highly reliable rotary polygon mirror driving device having a simple structure and no squeezing of a bearing.
【図１】（ａ）本発明の第１の実施例における回転多面
鏡駆動装置の縦断面図 （ｂ）図１（ａ）におけるＡ−Ｂ線での切断断面図FIG. 1A is a longitudinal sectional view of a rotary polygon mirror driving device according to a first embodiment of the present invention. FIG. 1B is a sectional view taken along line AB in FIG. 1A.
【図２】（ａ）本発明の第２の実施例における回転多面
鏡駆動装置の縦断面図 （ｂ）図２（ａ）におけるＡ−Ｂ線での切断断面図2A is a longitudinal sectional view of a rotary polygon mirror driving device according to a second embodiment of the present invention. FIG. 2B is a sectional view taken along line AB in FIG. 2A.
【図３】従来の回転多面鏡駆動装置の縦断面図FIG. 3 is a longitudinal sectional view of a conventional rotary polygon mirror driving device.
１ シャフト ２ ロータボス ３ 回転多面鏡 ４ 押え板 ５ マグネット ６ ブラケット ６ａ 凸部 ６ｂ 凹部 ７ ステータ ８ ブラケットカバー ９，１０ 玉軸受 １１ バネ １２ ゴム DESCRIPTION OF SYMBOLS 1 Shaft 2 Rotor boss 3 Rotating polygon mirror 4 Holding plate 5 Magnet 6 Bracket 6a Convex part 6b Concave part 7 Stator 8 Bracket cover 9,10 Ball bearing 11 Spring 12 Rubber
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G02B 26/10 102 B41J 2/44 H02K 5/167 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G02B 26/10 102 B41J 2/44 H02K 5/167
Claims (4)
材のラジアル方向外周に対向した位置に外壁を設け、前
記外壁内周面を構成する中心軸をロータ組立の回転中心
軸に対して偏心させ、回転部材と外壁内周間に圧力差を
生じるような部分的な空隙差を設け、前記回転部材上の
ラジアル方向外周上に歯車状もしくは、角柱状の少なく
とも１個以上の凹凸部を備えた回転多面鏡駆動装置。 An outer wall is provided at a position facing a radially outer periphery of a rotor assembly and a rotating member of the rotor assembly, and a center axis constituting an inner peripheral surface of the outer wall is eccentric with respect to a rotation center axis of the rotor assembly. , The pressure difference between the rotating member and the inner circumference of the outer wall
Providing a partial gap difference as occurs ,
Gear-shaped or prism-shaped on the outer circumference in the radial direction
A rotary polygon mirror drive device having at least one uneven portion.
記載の回転多面鏡駆動装置。 2. The method according to claim 1, wherein the concave and convex portions are constituted by a rotating polygon mirror.
The rotating polygon mirror driving device as described in the above.
１個以上の凹部または、凸部で構成した請求項１または
請求項２記載の回転多面鏡駆動装置。 3. The method according to claim 1, wherein the gap difference is at least part of the inner peripheral surface of the outer wall.
Claim 1 or comprising at least one concave or convex part
The rotary polygon mirror driving device according to claim 2.
の広い部分と兼用させた請求項１または請求項２記載の
回転多面鏡駆動装置。 4. An optical scanning window portion facing a mirror surface of a rotary polygon mirror.
3. The method according to claim 1 or 2, wherein the portion is also used as a wide portion.
Rotating polygon mirror drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8299193A JP2922083B2 (en) | 1993-04-09 | 1993-04-09 | Rotating polygon mirror drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8299193A JP2922083B2 (en) | 1993-04-09 | 1993-04-09 | Rotating polygon mirror drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06294937A JPH06294937A (en) | 1994-10-21 |
| JP2922083B2 true JP2922083B2 (en) | 1999-07-19 |
Family
ID=13789694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8299193A Expired - Fee Related JP2922083B2 (en) | 1993-04-09 | 1993-04-09 | Rotating polygon mirror drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2922083B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3641564B2 (en) | 1999-09-08 | 2005-04-20 | 日本電産株式会社 | Rotating device and recording device provided with radial dynamic pressure bearing |
-
1993
- 1993-04-09 JP JP8299193A patent/JP2922083B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06294937A (en) | 1994-10-21 |
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