JPH0519201A - Rotary device - Google Patents
Rotary deviceInfo
- Publication number
- JPH0519201A JPH0519201A JP3198752A JP19875291A JPH0519201A JP H0519201 A JPH0519201 A JP H0519201A JP 3198752 A JP3198752 A JP 3198752A JP 19875291 A JP19875291 A JP 19875291A JP H0519201 A JPH0519201 A JP H0519201A
- Authority
- JP
- Japan
- Prior art keywords
- temperature detector
- dynamic pressure
- shaft
- sleeve
- output signal
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 239000004519 grease Substances 0.000 abstract description 5
- 230000001050 lubricating effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、回転駆動装置に動圧流
体軸受を利用する回転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 device using a hydrodynamic bearing as a rotary drive device.
【0002】[0002]
【従来の技術】従来から、レーザービームプリンタ等に
設置される偏向走査装置には、高速かつ高精度な回転を
得るために、非接触で回転可能な動圧流体軸受が利用さ
れている。図3は動圧流体軸受を利用したレーザービー
ムプリンタの偏向走査装置の断面図である。回転軸1と
スリーブ2は回転自在に嵌合され、回転軸1はスラスト
板3を介して固定板4に支持され、固定板4は外筒5に
固定されている。回転軸1にはフランジ6が固定されて
いてフランジ6の上部には回転多面鏡7が載置され、フ
ランジ6の下部には駆動用マグネット8が固定されたヨ
ーク9が設置されている。更に、駆動用マグネット8と
対向する位置に、外筒5に固定された電磁コイル10が
配置されて駆動モータが構成されている。2. Description of the Related Art Conventionally, in a deflection scanning device installed in a laser beam printer or the like, a non-contact rotatable hydrodynamic bearing has been used in order to obtain high speed and high precision rotation. FIG. 3 is a sectional view of a deflection scanning device of a laser beam printer using a hydrodynamic bearing. The rotary shaft 1 and the sleeve 2 are rotatably fitted together, the rotary shaft 1 is supported by a fixed plate 4 via a thrust plate 3, and the fixed plate 4 is fixed to an outer cylinder 5. A flange 6 is fixed to the rotary shaft 1, a rotary polygon mirror 7 is placed on the upper part of the flange 6, and a yoke 9 to which a driving magnet 8 is fixed is installed below the flange 6. Further, an electromagnetic coil 10 fixed to the outer cylinder 5 is arranged at a position facing the drive magnet 8 to form a drive motor.
【0003】ここで、回転軸1の下端と対向するスラス
ト板3の表面には浅溝11が刻設されて動圧スラスト軸
受を形成し、また回転軸1の外周面にはヘリングボーン
状の浅溝14が刻設されて動圧ラジアル軸受を形成し、
更にスパイラル状の浅溝15が刻設されて潤滑流体が動
圧流体軸受に流れるようになっている。スリーブ2に
は、ヘリングボーン状浅溝14とスパイラル状浅溝15
の中間位置に凹部16及び小径孔17が設けられ、潤滑
流体として油やグリース等の液体を使用する動圧流体軸
受の安定性が確保されている。Here, a shallow groove 11 is formed on the surface of the thrust plate 3 facing the lower end of the rotary shaft 1 to form a dynamic thrust bearing, and the outer peripheral surface of the rotary shaft 1 has a herringbone shape. The shallow groove 14 is engraved to form a dynamic pressure radial bearing,
Further, a spiral shallow groove 15 is engraved so that the lubricating fluid can flow to the hydrodynamic bearing. The sleeve 2 has a herringbone-shaped shallow groove 14 and a spiral-shaped shallow groove 15.
The concave portion 16 and the small diameter hole 17 are provided at the intermediate position of the above, and the stability of the dynamic pressure fluid bearing that uses a liquid such as oil or grease as the lubricating fluid is secured.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、潤滑流
体に油やグリース等を使用する場合には、油やグリース
等は温度により粘度が変化するため、動圧流体軸受部の
損失トルクも大きく変化する。従って、所定の回転数に
到達し難いことと、或いは所定の回転数に到達するまで
に長時間を必要とすることになり、レーザービームプリ
ンタ等のプリントを開始するまでに長時間を必要とする
問題点がある。However, when oil or grease is used as the lubricating fluid, the viscosity of the oil or grease changes with temperature, and the loss torque of the hydrodynamic bearing also changes greatly. . Therefore, it is difficult to reach the predetermined number of rotations, or it takes a long time to reach the predetermined number of rotations, and it takes a long time to start printing by a laser beam printer or the like. There is a problem.
【0005】本発明の目的は、上述の問題点を解消し、
駆動モータの所定の回転数に到達する時間を短縮する回
転装置を提供することにある。The object of the present invention is to solve the above problems,
It is an object of the present invention to provide a rotating device that shortens the time required for the drive motor to reach a predetermined rotation speed.
【0006】[0006]
【課題を解決するための手段】上述の目的を達成するた
めの本発明に係る回転装置は、回転駆動する軸と、該軸
を保持するスリーブとを有し、前記軸の外周面又は前記
スリーブの内周面に浅溝を刻設して動圧発生部を設け、
該動圧発生部の近傍に温度検出器を配置し、該温度検出
器からの信号に応じて前記回転鏡を駆動する駆動モータ
の起動電流を制御する手段を備えたことを特徴とするも
のである。A rotating device according to the present invention for achieving the above object has a shaft for rotationally driving and a sleeve for holding the shaft, and the outer peripheral surface of the shaft or the sleeve. A shallow groove is engraved on the inner peripheral surface of the
A temperature detector is arranged in the vicinity of the dynamic pressure generation unit, and means for controlling a starting current of a drive motor for driving the rotary mirror according to a signal from the temperature detector is provided. is there.
【0007】[0007]
【作用】上述の構成を有する回転装置は、温度検出器か
らの出力信号に応じて、駆動モータへの起動電流を制御
して所定の回転数への到達時間を調節する。The rotating device having the above-described structure controls the starting current to the drive motor in accordance with the output signal from the temperature detector to adjust the time required to reach the predetermined rotation speed.
【0008】[0008]
【実施例】本発明を図1、図2に図示の実施例に基づい
て詳細に説明する。なお、図3と同一の符号は同一の部
材を示している。図1は断面図であり、回転軸1〜小径
孔17までの構成は従来例と同様であるので説明を省略
する。そして、回転軸1に対し回転自在に嵌合するスリ
ーブ2の外側の凹部2a内には、サーミスタ等の温度検
出器18が取り付けられ、この温度検出器18からの出
力信号は図示しないリード線を介して検出回路、制御回
路に接続されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. The same reference numerals as those in FIG. 3 indicate the same members. FIG. 1 is a cross-sectional view, and since the configuration from the rotary shaft 1 to the small diameter hole 17 is the same as that of the conventional example, the description will be omitted. A temperature detector 18, such as a thermistor, is mounted in the recess 2a on the outer side of the sleeve 2 which is rotatably fitted to the rotary shaft 1. An output signal from the temperature detector 18 is supplied to a lead wire (not shown). It is connected to the detection circuit and the control circuit via.
【0009】レーザープリンタの電源スイッチを入れる
と、温度検出器18からの出力信号が所定値以下の場合
には、駆動モータの起動電流は温度検出器18の出力信
号に応じて設定される。従って、冬期や寒冷地でレーザ
ープリンタを使用する場合に、電源スイッチを入れた直
後には動圧流体軸受部の油やグリースの粘度が高くなっ
ていても、起動電流が多く流すことにより、所定の回転
数に迅速に到達し、プリントを開始するまでの時間が短
縮される。When the power switch of the laser printer is turned on and the output signal from the temperature detector 18 is below a predetermined value, the starting current of the drive motor is set according to the output signal of the temperature detector 18. Therefore, when using the laser printer in winter or cold regions, even if the viscosity of the oil or grease in the hydrodynamic bearing is high immediately after the power switch is turned on, a large amount of starting current is used to prevent Reaching the number of rotations of, and shortening the time to start printing.
【0010】また、極端に温度が低い場合には、駆動モ
ータの起動電流が多過ぎてモータ駆動回路が損傷するこ
ともあるため、温度検出器18からの信号により装置温
度が所定値になるまで駆動モータへの通電を遮断するよ
うに作動する。また、或る所定温度以上の場合には、駆
動モータ起動電流は一定のままで駆動するようにしても
よい。Further, when the temperature is extremely low, the starting current of the drive motor is too large and the motor drive circuit may be damaged. Therefore, the signal from the temperature detector 18 causes the device temperature to reach a predetermined value. Operates so that the drive motor is de-energized. Further, when the temperature is equal to or higher than a certain predetermined temperature, the drive motor starting current may be kept constant.
【0011】このように、動圧流体軸受部の近傍に温度
検出器18を設置し、この温度検出器18からの信号に
応じて駆動モータに流れる起動電流を制御することによ
り、偏向走査装置を取り付けたレーザービームプリンタ
のプリント開始時間を所定内に収めることができ、また
極端に低温の場合には装置の損傷を防止することができ
る。As described above, the temperature detector 18 is installed in the vicinity of the dynamic pressure fluid bearing portion, and the starting current flowing through the drive motor is controlled according to the signal from the temperature detector 18, so that the deflection scanning device can be operated. The print start time of the installed laser beam printer can be kept within a predetermined time, and the device can be prevented from being damaged when the temperature is extremely low.
【0012】図2は第2の実施例を示す断面図である。
スリーブ2には、ラジアル動圧発生用の回転軸1の2個
所のヘリングボーン状の浅溝14に対向する位置に凹部
2bが設けられ、凹部2b内には温度検出器18が設置
されている。温度検出器18の凹部2bからのリード線
は図示しないシール部材によりシールされ、スリーブ2
内の潤滑流体が漏出しないようになっている。FIG. 2 is a sectional view showing a second embodiment.
The sleeve 2 is provided with recesses 2b at positions opposed to the two herringbone-shaped shallow grooves 14 of the rotary shaft 1 for generating radial dynamic pressure, and a temperature detector 18 is installed in the recess 2b. . The lead wire from the recess 2b of the temperature detector 18 is sealed by a seal member (not shown),
The lubricating fluid inside does not leak out.
【0013】この実施例においても先の実施例と同様の
作用効果を有するが、場合には、温度検出器18は潤滑
流体に直接接しているので、応答性が良く、更に確実な
作動が保証される。This embodiment also has the same operation and effect as the previous embodiment, but in this case, the temperature detector 18 is in direct contact with the lubricating fluid, so that the response is good and a more reliable operation is guaranteed. To be done.
【0014】なお、これらの2つの実施例では回転軸1
が回転する場合について述べたが、軸が固定でスリーブ
2が回転する場合にも、固定軸に温度検出器18を設置
することにより同様な効果が得られる。更に、動圧発生
用の浅溝は軸外周面或いはスリーブ内周面の何れに刻設
してもよい。In these two embodiments, the rotary shaft 1
Although the case where the shaft rotates is described, the same effect can be obtained by installing the temperature detector 18 on the fixed shaft even when the shaft is fixed and the sleeve 2 rotates. Further, the shallow groove for generating dynamic pressure may be formed on either the outer peripheral surface of the shaft or the inner peripheral surface of the sleeve.
【0015】なお、実施例においてはレーザービームプ
リンタ等に取り付けられる偏向走査装置について説明し
たが、磁気録画再生装置(VTR)の回転ヘッドアセン
ブリ等の高精度な回転装置にも適用することができる。Although the deflection scanning device attached to a laser beam printer or the like has been described in the embodiment, it can be applied to a highly accurate rotating device such as a rotating head assembly of a magnetic recording and reproducing device (VTR).
【0016】[0016]
【発明の効果】以上説明したように本発明に係る回転装
置は、動圧流体軸受の動圧発生部近傍に温度検出器を設
置し、温度検出器からの出力信号に応じて駆動モータの
起動電流を制御することにより、低温時における駆動モ
ータの所定回転数に到達する時間を短縮し、また駆動モ
ータへの過剰電流による回路損傷を防ぐことができる。As described above, in the rotating device according to the present invention, the temperature detector is installed near the dynamic pressure generating portion of the hydrodynamic bearing, and the drive motor is started in response to the output signal from the temperature detector. By controlling the current, it is possible to shorten the time required for the drive motor to reach a predetermined rotation speed at low temperatures, and prevent circuit damage due to excess current to the drive motor.
【図1】第1の実施例の断面図である。FIG. 1 is a sectional view of a first embodiment.
【図2】第2の実施例の断面図である。FIG. 2 is a sectional view of a second embodiment.
【図3】従来例の偏向走査装置の断面図である。FIG. 3 is a sectional view of a conventional deflection scanning device.
1 回転軸 2 スリーブ 7 回転多面鏡 2a、2b 凹部 11、14、15 浅溝 18 温度検出器 1 rotation axis 2 sleeve 7 rotating polygon mirror 2a, 2b recess 11, 14, 15 shallow groove 18 Temperature detector
Claims (4)
ーブとを有し、前記軸の外周面又は前記スリーブの内周
面に浅溝を刻設して動圧発生部を設け、該動圧発生部の
近傍に温度検出器を配置し、該温度検出器からの信号に
応じて前記回転鏡を駆動する駆動モータの起動電流を制
御する手段を備えたことを特徴とする回転装置。1. A shaft for rotating and a sleeve for holding the shaft, wherein a shallow groove is formed on the outer peripheral surface of the shaft or the inner peripheral surface of the sleeve to provide a dynamic pressure generating portion. A rotating device comprising a temperature detector arranged in the vicinity of the dynamic pressure generating portion, and means for controlling a starting current of a drive motor for driving the rotating mirror according to a signal from the temperature detector.
ら外れた場合に、前記駆動モータへの通電を遮断するよ
うにした請求項1に記載の回転装置。2. The rotating device according to claim 1, wherein when the signal from the temperature detector deviates from a predetermined temperature, power supply to the drive motor is cut off.
流体に直接接触するようにした請求項1に記載の回転装
置。3. The rotating device according to claim 1, wherein the temperature detector is in direct contact with a fluid interposed in the dynamic pressure generating portion.
た光ビームを偏向走査する回転鏡を取り付けた請求項1
に記載の回転装置。4. The rotating shaft is attached to the axis for deflecting and scanning the light beam emitted from the light beam generating means.
The rotating device according to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3198752A JPH0519201A (en) | 1991-07-12 | 1991-07-12 | Rotary device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3198752A JPH0519201A (en) | 1991-07-12 | 1991-07-12 | Rotary device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0519201A true JPH0519201A (en) | 1993-01-29 |
Family
ID=16396376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3198752A Pending JPH0519201A (en) | 1991-07-12 | 1991-07-12 | Rotary device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0519201A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6741420B2 (en) * | 2000-07-26 | 2004-05-25 | Seagate Technology Llc | Hydrodynamic spindle motor with an internally disposed heating element |
WO2009122784A1 (en) * | 2008-03-31 | 2009-10-08 | 株式会社日立製作所 | Motor controller, air compressor, air conditioner, controller of passenger conveyor and controller of conveyor |
JP2011043737A (en) * | 2009-08-24 | 2011-03-03 | Kyocera Mita Corp | Image forming apparatus |
JP2018034355A (en) * | 2016-08-30 | 2018-03-08 | コニカミノルタ株式会社 | Image formation apparatus, control method and control program |
-
1991
- 1991-07-12 JP JP3198752A patent/JPH0519201A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6741420B2 (en) * | 2000-07-26 | 2004-05-25 | Seagate Technology Llc | Hydrodynamic spindle motor with an internally disposed heating element |
WO2009122784A1 (en) * | 2008-03-31 | 2009-10-08 | 株式会社日立製作所 | Motor controller, air compressor, air conditioner, controller of passenger conveyor and controller of conveyor |
JP2009247082A (en) * | 2008-03-31 | 2009-10-22 | Hitachi Ltd | Motor controller, air compressor, air conditioner, controller for passenger conveyors, and controller for conveyors |
CN101983478A (en) * | 2008-03-31 | 2011-03-02 | 株式会社日立制作所 | Motor controller, air compressor, air conditioner, controller of passenger conveyor and controller of conveyor |
US9136788B2 (en) | 2008-03-31 | 2015-09-15 | Hitachi, Ltd. | Motor controller, air compressor, air conditioner, controller of passenger conveyor and controller of conveyor |
EP2264887A4 (en) * | 2008-03-31 | 2018-03-21 | Hitachi, Ltd. | Motor controller, air compressor, air conditioner, controller of passenger conveyor and controller of conveyor |
JP2011043737A (en) * | 2009-08-24 | 2011-03-03 | Kyocera Mita Corp | Image forming apparatus |
JP2018034355A (en) * | 2016-08-30 | 2018-03-08 | コニカミノルタ株式会社 | Image formation apparatus, control method and control program |
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