JPH01274656A - Scanner motor - Google Patents
Scanner motorInfo
- Publication number
- JPH01274656A JPH01274656A JP10294988A JP10294988A JPH01274656A JP H01274656 A JPH01274656 A JP H01274656A JP 10294988 A JP10294988 A JP 10294988A JP 10294988 A JP10294988 A JP 10294988A JP H01274656 A JPH01274656 A JP H01274656A
- Authority
- JP
- Japan
- Prior art keywords
- polygon mirror
- rotating member
- scanner motor
- tripping
- bearing
- 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
- 238000001514 detection method Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 9
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Landscapes
- Brushless Motors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、事務機、映像機器、光学機器等に使用され
るスキャナモータに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scanner motor used in office machines, video equipment, optical equipment, etc.
従来、たとえばレーザプリンタ用のスキャナモータは、
多面鏡が取り付けられたスリーブを固定軸のまわりに動
圧形ラジアル軸受を介して支持し、スリーブに取り付け
たロータマグネットとロータマグネットに対向してハウ
ジングに取り付けたステータコイルとからなるモータを
駆動してスリーブを回転させる構造になっている。Conventionally, for example, scanner motors for laser printers were
A sleeve to which a polygon mirror is attached is supported around a fixed shaft via a hydrodynamic radial bearing, and a motor consisting of a rotor magnet attached to the sleeve and a stator coil attached to a housing opposite to the rotor magnet is driven. The structure is such that the sleeve can be rotated.
このスキャナモータは、第２図に示すように回転する多
面鏡３５にレーザ光ｌを入射して、反射面から反射した
レーザ光２を回転する感光ドラム３に照射することによ
り、多面鏡３５の回転方向（主走査方向）Ｘ−Ｘにおけ
るレーザ光の走査を行うようにしている。As shown in FIG. 2, this scanner motor inputs a laser beam 1 into a rotating polygon mirror 35 and irradiates the rotating photosensitive drum 3 with the laser beam 2 reflected from a reflecting surface. Laser light scanning is performed in the rotational direction (main scanning direction) XX.
上記構造を有するスキャナモータの回転中に、軸受の軸
心０−０に対して多面鏡３５の振れまわりが起こると、
第３図に示すように反射レーザ光２は、多面鏡３５の中
心軸線Ｕ−Ｕの倒れ角θに対応して上下方向に振れるた
め、感光ドラム３上での反射レーザ光２の照射位置が主
走査方向Ｘ−Ｘに対して上下方向に直交する方向（副走
査方向）Ｙ−Ｙに動くことになる。When the polygon mirror 35 swings around with respect to the axis 0-0 of the bearing during rotation of the scanner motor having the above structure,
As shown in FIG. 3, the reflected laser beam 2 swings in the vertical direction corresponding to the inclination angle θ of the central axis U-U of the polygon mirror 35, so that the irradiation position of the reflected laser beam 2 on the photosensitive drum 3 is It moves in a direction (sub-scanning direction) YY perpendicular to the vertical direction with respect to the main scanning direction XX.
しかし、従来のスキャナモータにおいては、上記のよう
な副走査方向Ｙ−Ｙのレーザ光の動きを制御することは
できないという欠点がある。However, the conventional scanner motor has a drawback in that the movement of the laser beam in the sub-scanning direction YY cannot be controlled as described above.
この発明は、上記の欠点を除去したスキャナモータを提
供量ることを目的とする。The object of the present invention is to provide a scanner motor that eliminates the above-mentioned drawbacks.
上記目的を達成するため、この発明においてはスキャナ
モータの回転部材の外面に取り付けられた多面鏡の軸受
軸心に対する倒れ角を検出する検出手段と、この検出手
段からの信号に基づいて軸受軸心に対する多面鏡の倒れ
角を補正するための制御手段とを設けている。In order to achieve the above object, the present invention includes a detection means for detecting an inclination angle with respect to the bearing axis of a polygon mirror attached to the outer surface of a rotating member of a scanner motor, and a detecting means for detecting an inclination angle with respect to the bearing axis of a polygon mirror attached to the outer surface of a rotating member of a scanner motor. A control means for correcting the angle of inclination of the polygon mirror relative to the angle of inclination of the polygon mirror is provided.
以下、この発明の実施例をレーザプリンタ用のスキャナ
モータを示す第１図に基づいて説明する。Embodiments of the present invention will be described below with reference to FIG. 1, which shows a scanner motor for a laser printer.
ハウジング１０は、円筒状の上側部材１１および下側部
材１２と、上側部材１１に取り付けられたカバー１３と
、下側部材１２に取り付けられた基台１４とにより気密
に構成されている。The housing 10 is airtightly constructed of a cylindrical upper member 11 and a lower member 12, a cover 13 attached to the upper member 11, and a base 14 attached to the lower member 12.
固定部材２０として固定軸が配設され、この固定部材２
０の一方の端部（下端部）が基台１４に圧入笠により取
り付けてあり、この固定部材２０には微小の半径方向す
きまを隔てて中空円筒状のスリーブ３１が嵌合している
。スリーブ３１には、空気抜き穴３２を有するスラスト
受部材３３が取り付けてあり、このスラスト受部材３３
とスリーブ３１とにより回転部材３０が構成されている
。A fixed shaft is provided as the fixed member 20, and this fixed member 2
One end (lower end) of the fixing member 20 is attached to the base 14 by a press-fit cap, and a hollow cylindrical sleeve 31 is fitted into the fixing member 20 with a small radial gap therebetween. A thrust receiving member 33 having an air vent hole 32 is attached to the sleeve 31.
and the sleeve 31 constitute a rotating member 30.
固定部材２０の外径面には、動圧発生用みぞ２１を４個
所に設けたラジアル受面が形成され、このラジアル受面
とこれに対向して回転部材３０の内径面に形成されたラ
ジアル軸受面とが動圧形ラジアル軸受を構成し、回転部
材３０の回転により回転部材３０と固定部材２０との間
の半径方向すきまに動圧を発生させて、回転部材３０の
ラジアル荷重を支持するようになっている。A radial receiving surface with dynamic pressure generation grooves 21 provided at four locations is formed on the outer diameter surface of the fixed member 20, and a radial receiving surface is formed on the inner diameter surface of the rotating member 30 opposite to this radial receiving surface. The bearing surface constitutes a dynamic pressure type radial bearing, and the rotation of the rotating member 30 generates dynamic pressure in the radial clearance between the rotating member 30 and the fixed member 20 to support the radial load of the rotating member 30. It looks like this.
また、スラスト受部材３３の下端面に形成されたスラス
ト軸受面と、これに対向する固定部材２０の上端面に形
成された凸球面状のスラスト受面とによりスラスト軸受
が構成され、動圧発生用みぞ２１のポンピング作用によ
って回転部材３０と固定部材２０との間の半径方向すき
まからスラスト軸受面とスラスト受面との間のスラスト
軸受すきまに流入した流体によって回転部材３０のスラ
スト荷重を支持するようになっている。In addition, a thrust bearing is constituted by a thrust bearing surface formed on the lower end surface of the thrust bearing member 33 and a convex spherical thrust bearing surface formed on the upper end surface of the fixed member 20 opposite thereto, and dynamic pressure is generated. The thrust load of the rotating member 30 is supported by the fluid flowing from the radial gap between the rotating member 30 and the fixed member 20 into the thrust bearing gap between the thrust bearing surfaces by the pumping action of the working groove 21. It looks like this.
回転部材３０にはフランジ３４が設けてあり、回転部材
３０の外周面に嵌合した多面鏡３５がフランジ３４の下
面に密着し取り付けられている。The rotating member 30 is provided with a flange 34, and a polygon mirror 35 fitted on the outer circumferential surface of the rotating member 30 is attached in close contact with the lower surface of the flange 34.
多面鏡３５の反射面と水平方向に対向する位置のハウジ
ング１０の下側部材１２には、透明材質の窓１４が設け
てあり、多面鏡３５により反射されたレーザ光がこの窓
１４を通って図示しない感光ドラムに照射されるように
なっている。A window 14 made of a transparent material is provided in the lower member 12 of the housing 10 at a position horizontally opposite to the reflective surface of the polygon mirror 35, and the laser beam reflected by the polygon mirror 35 passes through this window 14. A photosensitive drum (not shown) is irradiated with the light.
回転部材３０のフランジ３４よりも軸方向上方′の段部
には、回転部材３０の外周面に嵌合した円筒状のロータ
マグネット４０が係止され、ロータマグネット４０の上
下面はバランスリング４１と段部とにより挟着しである
。ロータマグネット４０はハウジング１０の上側部材１
１に取り付けた円筒状のズテータコイル４２と所定の半
径方向すきまを隔てて対向し、このロータマグネット４
０とステータコイル４２とにより回転部材３０の駆動用
モータ機構を構成している。A cylindrical rotor magnet 40 fitted to the outer circumferential surface of the rotating member 30 is locked to a stepped portion axially above the flange 34 of the rotating member 30, and the upper and lower surfaces of the rotor magnet 40 are fitted with a balance ring 41. It is sandwiched between the step part and the step part. The rotor magnet 40 is the upper member 1 of the housing 10.
The rotor magnet 4 faces the cylindrical stator coil 42 attached to the rotor magnet 4 with a predetermined radial clearance therebetween.
0 and the stator coil 42 constitute a motor mechanism for driving the rotating member 30.
上記のスキャナモータにおいて、軸受軸心Ｏ−０に対す
る多面鏡３５の倒れ角θを検出する検出手段として非接
触形の変位計５０をハウジングｌＯの下側部材１２に取
り付け、この変位計５０を多面鏡３５の下面の半径方向
外周部に対向させである。この種の変位計５０としては
、たとえば渦電流式変位計を使用することができる。In the above scanner motor, a non-contact type displacement meter 50 is attached to the lower member 12 of the housing IO as a detection means for detecting the inclination angle θ of the polygon mirror 35 with respect to the bearing axis O-0. This is opposed to the radially outer peripheral portion of the lower surface of the mirror 35. As this type of displacement meter 50, for example, an eddy current type displacement meter can be used.
また、多面鏡３５の下面には、バランスリング兼用の被
駆動板５４が取り付けてあり、この被駆動板５４の下面
に一定間隔で対向する一対または二対以上の駆動素子５
２がハウジングｌＯの下側部材１２に取り付けられてい
る。これらの駆動素子５２と被駆動板５４とは多面鏡３
５の倒れ角θを補正するための制御手段を構成し、前記
変位計５０により検出された信号に基づいて両者間に吸
引力が作用するようになっている。駆動素子５２として
は、たとえば磁気力を利用したアクチュエータ（電磁石
）を使用し、被駆動板５４は強磁性体を素材とするもの
を使用するのが好適である。Further, a driven plate 54 which also serves as a balance ring is attached to the lower surface of the polygon mirror 35, and one or more pairs of driving elements 5 are arranged opposite to each other at a constant interval on the lower surface of this driven plate 54.
2 is attached to the lower member 12 of the housing IO. These driving elements 52 and driven plate 54 are connected to the polygon mirror 3.
A control means is configured to correct the inclination angle θ of the displacement meter 50, and an attractive force is applied between the two based on a signal detected by the displacement meter 50. As the drive element 52, it is preferable to use, for example, an actuator (electromagnet) using magnetic force, and for the driven plate 54, one made of a ferromagnetic material is preferably used.
上記のように構成されたスキャナモータにおいて、回転
中の多面鏡３５に振れまわりに起因する上下方向の傾き
が生じたときは、軸受軸心Ｏ−０に対する多面鏡３５の
倒れ角θが変位計５０により検出される。この検出信号
は駆動素子５２に送られ、駆動素子５２に入力された検
出信号に基づいて被駆動板５４と駆動素子５２との間に
は対向間隔の不均等を調整する吸引力が発生し、多面鏡
３５は軸受軸心０−０に対する倒れ角θが補正されて正
常な回転状態に復帰することになる。In the scanner motor configured as described above, when the rotating polygon mirror 35 tilts in the vertical direction due to whirling, the inclination angle θ of the polygon mirror 35 with respect to the bearing axis O-0 is determined by the displacement meter. 50. This detection signal is sent to the drive element 52, and based on the detection signal input to the drive element 52, an attractive force is generated between the driven plate 54 and the drive element 52 to adjust the uneven spacing between them. The inclination angle θ of the polygon mirror 35 with respect to the bearing axis 0-0 is corrected, and the polygon mirror 35 returns to its normal rotational state.
多面鏡３５の倒れ角θを直接検出する非接触形の変位計
５０に代えて、第２図に示す受光器５５を倒れ角θの検
出手段として兼用することもできる。この受光器５５は
感光ドラム３の側面に配設されており、本来主走査方向
Ｘ−Ｘの走査時間を検出するためのものであるが、副走
査方向Ｙ−Ｙのレーザ光の動きについても受光器５５に
より検出して、こ′の検出信号を前記駆動素子５２にフ
ィードバックすればよく、このようにして多面鏡３５の
倒れ角θを間接的に検出することができる。Instead of the non-contact type displacement meter 50 that directly detects the angle of inclination θ of the polygon mirror 35, a light receiver 55 shown in FIG. 2 can also be used as a means for detecting the angle of inclination θ. This light receiver 55 is disposed on the side surface of the photosensitive drum 3, and is originally used to detect the scanning time in the main scanning direction XX, but it also detects the movement of the laser beam in the sub-scanning direction Y-Y. The angle of inclination θ of the polygon mirror 35 can be detected indirectly by detecting it with the light receiver 55 and feeding back this detection signal to the drive element 52.
なお、上記構成とは別に、回転部材３０に回転位相検出
用のエンコーダを取り付け、ハウジング１０には磁気セ
ンサー、光センサー等を取り付けて、このセンサーがエ
ンコーダから検出した回転位相の信号を駆動用モータ機
構に送って回転部材３０の回転速度を′制御するように
することもできる。このような構成を付加すれば、レー
ザ光の動きを主走査方向（Ｘ−Ｘ）と副走査方向（Ｙ−
Ｙ）との双方で制御しながら走査することが可能となる
。In addition to the above configuration, an encoder for detecting the rotational phase is attached to the rotating member 30, and a magnetic sensor, an optical sensor, etc. are attached to the housing 10, and the rotational phase signal detected by this sensor from the encoder is sent to the drive motor. It is also possible to send it to a mechanism to control the rotational speed of the rotating member 30. If such a configuration is added, the movement of the laser beam can be controlled in the main scanning direction (X-X) and the sub-scanning direction (Y-X).
It becomes possible to scan while controlling both Y) and Y).
前記実施例では、回転部材を動圧形軸受によって支持す
る場合について説明したが、回転部材を支持する軸受に
ついては、玉軸受、磁気軸受を用いてもよい。In the embodiment described above, a case has been described in which the rotating member is supported by a hydrodynamic bearing, but a ball bearing or a magnetic bearing may be used as the bearing that supports the rotating member.
なお、図示の実施例ではスラスト受部材３３とスリーブ
３１とを備えた部材を回転部材３０とし、固定軸を固定
部材２０としたが、スリーブ３１を固定部材とし、スリ
ーブ３１に嵌合する軸を回転部材とし、軸に多面鏡３５
を取付けてもよい。In the illustrated embodiment, the rotating member 30 is a member including the thrust receiving member 33 and the sleeve 31, and the fixed shaft is the fixed member 20. However, the sleeve 31 is the fixed member, and the shaft that fits into the sleeve 31 is A rotating member with a polygon mirror 35 on the shaft.
may be installed.
以上説明したように、この発明のスキャナモータは、多
面鏡の倒れ角を検出する手段と、これを補正する制御手
段とを設けているから、多面鏡の回転中に振れまわりが
生じても、多面鏡の回転方向と軸方向に直交する副走査
方向のレーザ光の動きを制御しながら走査することが可
能となる。As explained above, since the scanner motor of the present invention is provided with a means for detecting the angle of inclination of the polygon mirror and a control means for correcting it, even if the polygon mirror swings around during rotation, It becomes possible to scan while controlling the movement of the laser beam in the sub-scanning direction that is perpendicular to the rotation direction and the axial direction of the polygon mirror.
【図面の簡単な説明】
第１図はこの発明の実施例を示す縦断側面図、第２図は
多面鏡により反射されたレーザ光の走査方向を示す斜視
図、第３図は多面鏡の振れまわり時の状態を示す側面図
である。
図中、１４は基台、２０は固定部材、２１は動圧発生用
のみぞ、３０は回転部材、３５は多面鏡、５０は多面鏡
の倒れ角を検出する検出手段、５２゜５４は多面鏡の倒
れ角を補正する制御手段、〇−〇は軸受軸心、θは多面
鏡の倒れ角である。
特許出願人 日本精工株式会社
代理人 弁理士 森 哲 也[Brief Description of the Drawings] Fig. 1 is a longitudinal cross-sectional side view showing an embodiment of the present invention, Fig. 2 is a perspective view showing the scanning direction of laser light reflected by a polygon mirror, and Fig. 3 is a deflection of the polygon mirror. FIG. 3 is a side view showing the state when rotating. In the figure, 14 is a base, 20 is a fixed member, 21 is a groove for generating dynamic pressure, 30 is a rotating member, 35 is a polygon mirror, 50 is a detection means for detecting the angle of inclination of the polygon mirror, 52° and 54 are polygons. Control means for correcting the inclination angle of the mirror, 〇-〇 is the bearing axis, and θ is the inclination angle of the polygon mirror. Patent applicant: NSK Ltd. Representative Patent attorney: Tetsuya Mori
Claims (1)
支持され、前記回転部材の外面に多面鏡が取り付けられ
てなるスキャナモータにおいて、前記多面鏡の軸受軸心
に対する倒れ角を検出する検出手段と、前記検出手段か
らの信号に基づいて軸受軸心に対する多面鏡の倒れ角を
補正する制御手段とを設けたことを特徴とするスキャナ
モータ。(1) In a scanner motor in which a rotating member is rotatably supported by a fixed member via a bearing, and a polygon mirror is attached to the outer surface of the rotating member, the inclination angle of the polygon mirror with respect to the bearing axis is detected. A scanner motor comprising: a detection means; and a control means for correcting an inclination angle of a polygon mirror with respect to a bearing axis based on a signal from the detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10294988A JPH01274656A (en) | 1988-04-26 | 1988-04-26 | Scanner motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10294988A JPH01274656A (en) | 1988-04-26 | 1988-04-26 | Scanner motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01274656A true JPH01274656A (en) | 1989-11-02 |
Family
ID=14341066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10294988A Pending JPH01274656A (en) | 1988-04-26 | 1988-04-26 | Scanner motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01274656A (en) |
-
1988
- 1988-04-26 JP JP10294988A patent/JPH01274656A/en active Pending
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