JP3165457B2 - Thrust bearing structure of polygon scanner - Google Patents
Thrust bearing structure of polygon scannerInfo
- Publication number
- JP3165457B2 JP3165457B2 JP06363991A JP6363991A JP3165457B2 JP 3165457 B2 JP3165457 B2 JP 3165457B2 JP 06363991 A JP06363991 A JP 06363991A JP 6363991 A JP6363991 A JP 6363991A JP 3165457 B2 JP3165457 B2 JP 3165457B2
- Authority
- JP
- Japan
- Prior art keywords
- fixed shaft
- polygon scanner
- thrust bearing
- bearing structure
- space
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Sliding-Contact Bearings (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ポリゴンスキャナのス
ラスト軸受構造、例えば、レーザプリンタ、デジタル複
写機等レーザ光書込みユニットの非接触の磁気軸受を用
いた高速ポリゴンスキャナのスラスト軸受構造に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust bearing structure of a polygon scanner, for example, a high speed polygon scanner using a non-contact magnetic bearing of a laser beam writing unit such as a laser printer or a digital copying machine.
【０００２】[0002]
【従来の技術】従来のポリゴンスキャナのスラスト軸受
構造としては、例えば、特公昭５３−６８５４号公報に
記載された図５（ａ）に示すようなものがある。このポ
リゴンスキャナ１はスラスト軸受を支持する回転軸２の
上部にミラー３を固定し、下部にスラスト磁気軸受４を
構成する２個のマグネット５を有し、中央部にはインナ
ーロータモーター部６を構成するマグネット７を有して
いる。また、ラジアル軸受８はティルティングパットに
よる動圧軸受を構成した非接触軸受構造である。2. Description of the Related Art As a conventional thrust bearing structure of a polygon scanner, there is, for example, a structure as shown in FIG. 5A described in Japanese Patent Publication No. 53-6854. The polygon scanner 1 has a mirror 3 fixed to an upper part of a rotating shaft 2 supporting a thrust bearing, two magnets 5 constituting a thrust magnetic bearing 4 at a lower part, and an inner rotor motor part 6 at a center part. It has a constituent magnet 7. The radial bearing 8 has a non-contact bearing structure that constitutes a dynamic pressure bearing using a tilting pad.
【０００３】また、高速ポリゴンスキャナのスラスト軸
受構造11として図５（ｂ）に示すようなものも考えられ
ている。このポリゴンスキャナのスラスト軸受構造は、
台座12上に固定された円柱状の固定軸13と、固定軸13の
外周で回転する中空回転体15と、を有している。固定軸
13の外周部には、ヘリングボーン溝が設けられ、ヘリン
グボーン溝は中空回転体15の回転により動圧空気が発生
し、ラジアル方向に非接触で支持する構成である。中空
回転体15は、筒状の回転軸15Ａの上部のフランジ部にポ
リゴンミラー16をミラー押え17でネジ止め固定し、ミラ
ー押え17の中央部の内側にはリング状の永久磁石18ｂを
固定している。また、固定軸13の軸線Ａ上には上蓋19に
固定した永久磁石18ａと固定軸13上部に固定した永久磁
石18ｃが設けられている。これらの上下に配置された３
つの永久磁石18は互いに反発するように配置されアキシ
ャル方向の磁気軸受構造の一部を構成している。[0005] A thrust bearing structure 11 for a high-speed polygon scanner as shown in FIG. The thrust bearing structure of this polygon scanner is
It has a cylindrical fixed shaft 13 fixed on the pedestal 12 and a hollow rotating body 15 that rotates around the outer periphery of the fixed shaft 13. Fixed axis
A herringbone groove is provided on the outer peripheral portion of the thirteen, and the herringbone groove is configured so that dynamic pressure air is generated by rotation of the hollow rotating body 15 and is supported in a non-contact manner in the radial direction. The hollow rotator 15 has a polygonal mirror 16 fixed to the upper flange portion of the cylindrical rotary shaft 15A by a screw 17 with a mirror retainer 17, and a ring-shaped permanent magnet 18b fixed inside the center of the mirror retainer 17. ing. On the axis A of the fixed shaft 13, a permanent magnet 18a fixed to the upper lid 19 and a permanent magnet 18c fixed above the fixed shaft 13 are provided. 3 arranged above and below
The two permanent magnets 18 are arranged so as to repel each other, and constitute a part of an axial magnetic bearing structure.
【０００４】ミラー押え17の中央部には細孔20が設けら
れており、この細孔20は中空回転体15が上下振動したと
き、中空回転体15内の空間内の空気を細孔20を通して出
入させ、中空回転体15の振動を減衰するダンピング効果
を有している。A small hole 20 is provided at the center of the mirror retainer 17. When the hollow rotary body 15 vibrates up and down, air in the space inside the hollow rotary body 15 passes through the small hole 20. It has a damping effect of moving in and out and damping the vibration of the hollow rotating body 15.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の図５（ａ）に示すポリゴンスキャナのスラス
ト軸受構造にあっては、スラスト磁気軸受が回転軸２の
下端部に２個のマグネット５による単純な反発を用いた
ものであるため、反発剛性が低く、さらに、上下振動に
対してダンピング機能を有していないので、耐振動特性
が悪いという問題点がある。However, in such a conventional thrust bearing structure of the polygon scanner shown in FIG. 5A, a thrust magnetic bearing is provided at the lower end of the rotary shaft 2 by two magnets 5. However, there is a problem that the repulsion stiffness is low because the repulsion rigidity is low, and furthermore, since it does not have a damping function against vertical vibration, the vibration resistance is poor.
【０００６】また、図５（ｂ）に示すポリゴンスキャナ
のスラスト軸受構造にあっては、中空回転体15の上部中
央にある細孔20により中空回転体15の振動に対する一応
のダンピング効果を有しているが、磁気軸受構造の振動
の共振点の周波数が、図１（ｂ）に矢印Ｂにて示すよう
に低く、輸送時に多い10〜50Ｈｚの振動の周波数帯にあ
るので、輸送時などの外部の振動が働いたとき、耐振性
が低く、回転体と固定軸が接触し、金属粉を発生する。
この金属粉が作動時に動圧空気軸受のすき間内に浸入
し、逐には焼き付き、回転不能になる。この様な構成で
は耐外乱振動は0.5 Ｇ程度が限界である。Further, in the thrust bearing structure of the polygon scanner shown in FIG. 5B, a small damping effect against the vibration of the hollow rotating body 15 is provided by the small hole 20 at the upper center of the hollow rotating body 15. However, the frequency of the resonance point of the vibration of the magnetic bearing structure is low as shown by an arrow B in FIG. When external vibration is applied, the vibration resistance is low, and the rotating body and the fixed shaft come into contact with each other to generate metal powder.
This metal powder enters the gap of the dynamic pressure air bearing during operation, and is sequentially seized and cannot rotate. In such a configuration, disturbance vibration resistance is limited to about 0.5 G.
【０００７】[0007]
【発明の目的】本発明は、このような従来技術の背景の
もとになされたものであり、アキシャル磁気軸受の空気
剛性を高めて耐振性を向上させ、ダンピング効果を増加
してその耐振性をさらに高め、さらに、部品数の増加を
抑制しながら簡単に耐振性を向上できるポリゴンスキャ
ナのスラスト軸受構造を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of such a background of the prior art, and has been made in consideration of an air bearing for an axial magnetic bearing .
Increased rigidity to improve vibration resistance and increase damping effect
To further increase the vibration resistance and increase the number of parts.
It is an object of the present invention to provide a polygon scanner thrust bearing structure that can easily improve vibration resistance while suppressing the vibration.
【０００８】[0008]
【発明の構成】上記目的達成のため、請求項１記載の発
明は、円柱状の固定軸の上部と該固定軸の外周で回転可
能な中空回転体の上部との間に振動減衰作用をなすよう
空気を 流出入させることができる上部空間を備え、前記
固定軸と同一軸線上に上下に配置されたリング状の永久
磁石のうち少なくとも２つをそれぞれ前記中空回転軸の
上部と前記固定軸の上部に固定し、前記上下の永久磁石
の内周により磁石内空間を形成して、アキシャル方向の
磁気軸受の一部を構成するポリゴンスキャナのスラスト
軸受構造において、非磁性体または磁性体からなり前記
磁石内空間の一部に挿入された少なくとも１つの挿入部
材を前記固定軸側または前記中空回転体側に固定し、前
記磁石内空間の容積を減少させることにより前記上部空
間内の空気剛性を高くしたことを特徴とするものであ
り、 請求項２記載の発明は、請求項１記載のポリゴンス
キャナのスラスト軸受構造において、前記挿入部材は前
記上下の永久磁石の少なくとも片方の内周または外周に
固定されていることを特徴とし、請求項３記載の発明
は、請求項１または２記載のポリゴンスキャナのスラス
ト軸受構造において、前記挿入部材は２つの前記永久磁
石の少なくとも一方の内周に固定され他方の内周内に凸
形状に突出していることを特徴とする。 また、上記目艇
達成のため、請求項４記載の発明は、円柱状の固定軸と
該固定軸の外周で回転可能な中空回転体とを備え、前記
固定軸と同一軸線上に上下に配置されたリング状の永久
磁石のうち少なくとも２つをそれぞれ前記中空回転軸の
上部と前記固定軸の上部に固定し、前記上下の永久磁石
の内周により磁石内空間を形成して、アキシャル方向の
磁気軸受の一部を構成するポリゴンスキャナのスラスト
軸受構造において、非磁性体または磁性体からなり、前
記磁石内空間の一部に挿入された少なくとも１つの挿入
部材を前記固定軸側または前記中空回転体側に固定し、
前記磁石内空間の容積を減少させ該空間内の空気剛性を
高くするとともに、前記挿入部材の軸線方向の端末と該
端末に対向する部材の間隔を、前記中空回転体の下端と
前記固定軸を固定する台座の間隔よりも大きくしたこと
を特徴とするものであり、請求項５記載の発明は、請求
項１、２または３におけるポリゴンスキャナのスラスト
軸受構造において、前記挿入部材は２つの前記永久磁石
の少なくとも一方の内周に固定され外部に連通する軸孔
を有することを特徴とするものである。 さらに、上記目
艇達成のため、請求項６記載の発明は、円柱状の固定軸
と該固 定軸の外周で回転可能な中空回転体とを備え、前
記固定軸と同一軸線上に上下に配置されたリング状の永
久磁石のうち少なくとも２つをそれぞれ前記中空回転軸
の上部と前記固定軸の上部に固定し、前記上下の永久磁
石の内周により磁石内空間を形成して、アキシャル方向
の磁気軸受の一部を構成するポリゴンスキャナのスラス
ト軸受構造において、非磁性体または磁性体からなり、
前記磁石内空間の一部に挿入された複数の挿入部材のう
ち１つは前記固定軸側の永久磁石の内周に一体的に形成
され、全体として円板状をなし、他の１つは前記中空回
転体側の永久磁石の内周に固定され外部に連通する軸孔
を有する環状体とし、前記磁石内空間の容積を減少させ
ることにより該空間内の空気剛性を高くしたことを特徴
とするものであり、請求項７記載の発明は、円柱状の固
定軸と該固定軸の外周で回転可能な中空回転体とを備
え、前記固定軸と同一軸線上に上下に配置されたリング
状の永久磁石のうち少なくとも２つをそれぞれ前記中空
回転軸の上部と前記固定軸の上部に固定し、前記上下の
永久磁石の内周により磁石内空間を形成して、アキシャ
ル方向の磁気軸受の一部を構成するポリゴンスキャナの
スラスト軸受構造において、前記固定軸側の永久磁石の
上面を閉止する円板状体を設け、前記磁石内空間の容積
を減少させることにより該空間内の空気剛性を高くした
ことを特徴とするものであり、請求項８記載の発明は、
円柱状の固定軸と該固定軸の外周で回転可能な中空回転
体とを備え、前記固定軸と同一軸線上に上下に配置され
たリング状の永久磁石のうち少なくとも２つをそれぞれ
前記中空回転軸の上部と前記固定軸の上部に固定し、前
記上下の永久磁石の内周により磁石内空間を形成して、
アキシャル方向の磁気軸受の一部を構成するポリゴンス
キャナのスラスト軸受構造において、前記固定軸側の永
久磁石の内周面側に接着剤を充填し、前記磁石内空間の
容積を減少させることにより該空間内の空気剛性を高く
したことを特徴とするものである。 To achieve the above object, the invention according to claim 1 is provided.
Akira is rotatable around the upper part of the cylindrical fixed shaft and the outer periphery of the fixed shaft.
Between the upper part of the rotating hollow body
An upper space through which air can flow in and out;
Ring-shaped permanent set up and down on the same axis as the fixed shaft
At least two of the magnets are respectively
The upper and lower permanent magnets fixed to the upper part and the upper part of the fixed shaft
A space inside the magnet is formed by the inner circumference of
Thrust of polygon scanner that forms part of magnetic bearing
In the bearing structure, the non-magnetic or magnetic material is used.
At least one insertion part inserted into a part of the space in the magnet
Material is fixed to the fixed shaft side or the hollow rotating body side,
By reducing the volume of the space inside the magnet,
The air stiffness in the space is increased.
According to a second aspect of the present invention, there is provided the polygons according to the first aspect.
4. The invention according to claim 3 , wherein in the thrust bearing structure of the canner, the insertion member is fixed to at least one of the inner and outer peripheries of the upper and lower permanent magnets.
Is a thruster of the polygon scanner according to claim 1 or 2.
In the bearing structure, the insertion member is fixed to the inner periphery of at least one of the two permanent magnets and protrudes into the other inner periphery in a convex shape . In addition,
In order to achieve this, the invention described in claim 4 has a cylindrical fixed shaft and
A hollow rotating body rotatable around the outer periphery of the fixed shaft,
Ring-shaped permanent set up and down on the same axis as the fixed shaft
At least two of the magnets are respectively
The upper and lower permanent magnets fixed to the upper part and the upper part of the fixed shaft
A space inside the magnet is formed by the inner circumference of
Thrust of polygon scanner that forms part of magnetic bearing
The bearing structure is made of non-magnetic or magnetic
At least one insertion inserted into a part of the internal space of the magnet
Fixing a member to the fixed shaft side or the hollow rotating body side,
Reduce the volume of the space in the magnet and increase the air stiffness in the space.
And the end of the insertion member in the axial direction and the
The interval between the members facing the terminal, the lower end of the hollow rotating body and
The distance between the pedestals for fixing the fixed shaft is larger than that of the pedestal.
According to a fifth aspect of the present invention, in the thrust bearing structure of the polygon scanner according to the first, second or third aspect , the insertion member is fixed to an inner periphery of at least one of the two permanent magnets. It has a shaft hole communicating with the outside . In addition, the above eye
In order to achieve the boat, the invention according to claim 6 has a cylindrical fixed shaft.
A rotatable hollow rotating body outer periphery of the solid Teijiku, before
A ring-shaped ring arranged vertically on the same axis as the fixed shaft
At least two of the permanent magnets are each hollow shaft
And fixed to the upper part of the fixed shaft and the upper and lower permanent magnets.
The inner space of the stone forms a magnet inner space,
Of the polygon scanner that forms part of the magnetic bearing
Bearing structure, made of non-magnetic or magnetic material,
A plurality of insertion members inserted into a part of the magnet inner space
One is formed integrally with the inner circumference of the permanent magnet on the fixed shaft side.
Into a disk shape as a whole, and the other one is the hollow circuit.
A shaft hole fixed to the inner circumference of the permanent magnet on the rolling element side and communicating with the outside
To reduce the volume of the inner space of the magnet
The feature is that the rigidity of the air in the space was increased by
Is intended to be, the invention of claim 7, wherein the cylindrical solid
A fixed shaft and a hollow rotating body rotatable around the fixed shaft are provided.
A ring arranged vertically on the same axis as the fixed shaft.
At least two of the permanent magnets are hollow
Fixed to the upper part of the rotating shaft and the upper part of the fixed shaft,
A space inside the magnet is formed by the inner circumference of the permanent magnet,
Of the polygon scanner that forms part of the magnetic bearing in the
In the thrust bearing structure, the permanent magnet on the fixed shaft side
A disk-shaped body for closing the upper surface is provided, and the volume of the space in the magnet is provided.
To increase the air stiffness in the space by reducing
The invention according to claim 8 is characterized in that :
Hollow rotation that can rotate around a cylindrical fixed shaft and the outer periphery of the fixed shaft
Body, and are disposed vertically on the same axis as the fixed shaft.
At least two of the ring-shaped permanent magnets
Fixed to the upper part of the hollow rotating shaft and the upper part of the fixed shaft,
A space inside the magnet is formed by the inner circumference of the upper and lower permanent magnets,
Polygons that form part of the axial magnetic bearing
In the canal thrust bearing structure, the fixed shaft side
The inner surface of the magnet is filled with an adhesive, and the inner space of the magnet is filled.
Higher air stiffness in the space by reducing the volume
It is characterized by having done.
【０００９】[0009]
【作用】請求項１記載の発明では、中空回転体内の上部
空間において、非磁性体または磁性体からなる少なくと
も１つの挿入部材がリング状の永久磁石の内周により形
成される磁石内空間の一部に挿入されているので、磁石
内空間の容積が挿入部材の挿入により減少し、振動減衰
のために空気の流出入がされる上部空間内の空気剛性が
高くなる。According to the first aspect of the present invention , the upper part of the hollow rotary body is provided.
In the space, at least one insertion member made of a non-magnetic material or a magnetic material is inserted into a part of the magnet inner space formed by the inner periphery of the ring-shaped permanent magnet.
The volume of the inner space is reduced by the insertion of the insertion member, the vibration damping
As a result, the rigidity of air in the upper space through which air flows in and out increases.
【００１０】請求項２記載の発明では、請求項１におけ
るポリゴンスキャナのスラスト軸受構造において、前記
挿入部材が永久磁石の内周または外周に固定されている
ので、前記磁石内空間の空気剛性が高くなるとともに、
該挿入部材の脱着が永久磁石と同時にでき、組立脱着作
業が容易になる。請求項３記載の発明では、請求項１ま
たは２におけるポリゴンスキャナのスラスト軸受構造に
おいて、挿入部材が非磁性体からなり他方の永久磁石の
内周内に凸形状に突出しているので、前述と同様に凸形
状の容積分だけ空気剛性がさらに高くなるとともに挿入
部材または永久磁石等の部品の寸法のバラツキがあって
も、前記他方の内周に対する凸形状の挿入部材の径差分
だけ空間があり、互いに接触するのを防止できる。According to the second aspect of the present invention , in the thrust bearing structure of the polygon scanner according to the first aspect, the insertion member is fixed to the inner periphery or the outer periphery of the permanent magnet, so that the air rigidity in the magnet inner space is high. Become
The attachment and detachment of the insertion member can be performed at the same time as the permanent magnet, so that the assembly and detachment work is facilitated. According to the third aspect of the present invention , in the thrust bearing structure of the polygon scanner according to the first or second aspect, the insertion member is made of a non-magnetic material and protrudes into the inner periphery of the other permanent magnet in a convex shape. only volume fraction of convex with air rigidity is further increased even if there is variation in parts dimension of such insertion member or a permanent magnet, there is a space just diameter difference of the insert member of convex shape with respect to the inner periphery of the other, the Contact with each other can be prevented.
【００１１】また、挿入部材が、磁性体からなり、永久
磁石の内周に一体的に固定し前述同様に凸形状に突出す
ることにより、前述の作用効果の外に、永久磁石と一体
的に形成でき、部品数を減少できる。請求項４記載の発
明では、挿入部材の端末と対向部材の間隔を所定の間隔
にすることにより、たとえ、接触しても間隔の小さい中
空回転体の下端と台座との間で起こり、中空回転体内部
での接触は回避される。The insertion member is made of a magnetic material, is fixed integrally to the inner periphery of the permanent magnet, and projects in a convex shape in the same manner as described above. Can be formed and the number of parts can be reduced. Issued according to claim 4, wherein
According to the description, the distance between the terminal of the insertion member and the opposing member is set to a predetermined distance. Is avoided.
【００１２】請求項５記載の発明では、請求項１、２ま
たは３におけるポリゴンスキャナのスラスト軸受構造に
おいて、挿入部材が外部に連通する軸孔を有しているの
で、前述と同様に、空気剛性が高くなるとともに、軸孔
の長さの分だけ空気の流動抵抗が高くなり、ダンピング
効果がさらに向上する。請求項６記載の発明では、前述
と同様に空気剛性が高くなるとともに、挿入部材が磁性
体からなり、固定軸側および回転軸側がともに対向して
円板形状であるので、磁性体がリング状から円板状に面
積の増加分だけ磁気的反発力が大幅に向上する。[0012] According to the fifth aspect of the present invention , the first and second aspects are provided.
In the thrust bearing structure of the polygon scanner according to 3 or 3 , since the insertion member has a shaft hole communicating with the outside, the air rigidity is increased as described above, and the air flow is increased by the length of the shaft hole. The flow resistance is increased, and the damping effect is further improved. According to the sixth aspect of the present invention,
With air stiffness is increased in the same manner as, the insertion member is made of magnetic material, than the fixed shaft side and the rotation shaft side are both opposed to disk-shaped, magnetic material elements of the area in a disc shape from the ring-shaped The magnetic repulsion is greatly improved by the increase.
【００１３】請求項７記載の発明では、前述と同様に空
気剛性が高くなるとともに、挿入部材が、非磁性体から
なり、永久磁石の上面を円板状体で閉止しているので、
前記空間内の容積の減少を簡単にでき、空気剛性を高く
できる。請求項８記載の発明では、前述と同様に空気剛
性が高くなるとともに、挿入部材が永久磁石の内径部に
充填した充填剤のみであり、簡単に空気剛性が高くな
る。According to the seventh aspect of the present invention, an empty space is provided as described above.
As the air stiffness increases and the insertion member is made of a non-magnetic material, the upper surface of the permanent magnet is closed with a disc
The volume in the space can be easily reduced, and the rigidity of the air can be increased. According to the eighth aspect of the present invention, the air stiffness is
As a result, the rigidity of the air is easily increased because only the filler filled in the inner diameter portion of the permanent magnet is used as the insertion member.
【００１４】[0014]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は本発明の第１実施例に係るポリゴンスキャ
ナのスラスト軸受構造を示す図で、本発明をレーザプリ
ンタの超高速ポリゴンスキャナに適用した場合を示す。
まず、構成について説明する。図１において、21は超高
速のポリゴンスキャナであり、ポリゴンスキャナ21は、
台座22に圧入固着または焼きばねなどにより堅固に固定
された筒状の固定軸23と、固定軸23と同一軸線Ａを有
し、固定軸23の外周で回転可能な筒状の回転体25とを備
えている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a thrust bearing structure of a polygon scanner according to a first embodiment of the present invention, in which the present invention is applied to an ultra-high-speed polygon scanner of a laser printer.
First, the configuration will be described. In FIG. 1, reference numeral 21 denotes an ultra-high-speed polygon scanner.
A cylindrical fixed shaft 23 fixedly press-fitted to the pedestal 22 or firmly fixed by a baking spring or the like; a cylindrical rotating body 25 having the same axis A as the fixed shaft 23 and rotatable around the outer periphery of the fixed shaft 23; It has.
【００１５】中空回転体25は、固定軸23の外周に間隙24
を介する管状の回転軸26と、回転軸26の上部フランジ26
ａ上に載置されたポリゴンミラー27と、ポリゴンミラー
27の上側からフランジ26ａ上にポリゴンミラー27をネジ
止めする円板状のミラー押え28と、回転軸26の中央部外
周に固定されたパイプ状のロータマグネット29と、を有
している。ロータマグネット29に対向して外方には、ス
テータ等のモータ部30がポリゴンスキャナ21のハウジン
グ21Ａに固定されている。モータ部30の駆動により回転
軸26を有する中空回転体25は、回転し、固定軸23との間
に固定軸23の外周部に設けられた上下２対のヘリングボ
ーン溝23ａ、23ｂによりラジアル方向の動圧軸受31を構
成している。中空回転体25の回転時のバランスはロータ
マグネット29の下方のバランスリング32と、中空回転体
25上部のミラー押え28の外周部のバランス修正溝28ａに
よりバランス修正がなされる。The hollow rotating body 25 has a gap 24 around the outer periphery of the fixed shaft 23.
A rotary shaft 26 of the tubular via the upper flange 26 of the rotary shaft 26
a, a polygon mirror 27 placed on a
It has a disk-shaped mirror retainer 28 for screwing the polygon mirror 27 onto the flange 26a from above the flange 27, and a pipe-shaped rotor magnet 29 fixed to the outer periphery of the central portion of the rotating shaft 26. A motor unit 30 such as a stator is fixed to the housing 21A of the polygon scanner 21 outwardly facing the rotor magnet 29. The hollow rotating body 25 having the rotating shaft 26 is rotated by the driving of the motor unit 30, and is rotated in the radial direction by two pairs of upper and lower herringbone grooves 23 a and 23 b provided on the outer periphery of the fixed shaft 23 between the rotating shaft 25 and the fixed shaft 23. Of the dynamic pressure bearing 31. The balance of the rotation of the hollow rotator 25 is determined by the balance ring 32 below the rotor magnet 29 and the hollow rotator.
The balance is corrected by the balance correcting groove 28a on the outer periphery of the mirror holder 28 on the upper part 25.
【００１６】ミラー押え28の中央部と固定軸23の上部
で、固定軸23と同一軸線Ａ上には、上下にリング状の２
つの永久磁石35Ｂおよび35Ｃ（代表するときは35とい
う）が配置されており、上側永久磁石35Ｂはミラー押え
28の中央内側に、下側永久磁石35Ｃは固定軸23の上部に
固定されている。永久磁石35は同一内径Ｄ1 を有する内
周を有し、上下の永久磁石35Ｂ、35Ｃの内周により筒状
の空間36（磁石内空間）が形成されている。空間36は動
圧軸受31の間隙24に連通している。また、ポリゴンスキ
ャナ21の上部を覆う上蓋の中央内側には軸線Ａ上にリン
グ状の永久磁石35Ａが設けられている。永久磁石35Ａ、
35Ｂ、35Ｃは互いに対向する面を同極とし、互いに反発
し非接触になるように配置され、アキシャル方向に中空
回転体25を支持している。ミラー押え28の中央には空間
36と中空回転体25の外部とを連通する微細穴38が設けら
れ、微細穴38は中空回転体25の上下方向の振動に対して
中空回転体25内の上部空間である空間36内への空気の流
出入を制御し振動減衰効果を出すようになされている。
永久磁石35および微細穴38は中空回転体25をアキシャル
方向に支持するスラスト軸受構造39を構成している。At the center of the mirror retainer 28 and above the fixed shaft 23, on the same axis A as the fixed shaft 23, two ring-shaped
There are two permanent magnets 35B and 35C (represented by 35), and the upper permanent magnet 35B is a mirror holder.
Inside the center of 28, the lower permanent magnet 35C is fixed to the upper part of the fixed shaft 23. The permanent magnet 35 has an inner circumference having the same inner diameter D1, and a cylindrical space 36 (magnet inner space) is formed by the inner circumferences of the upper and lower permanent magnets 35B and 35C. The space 36 communicates with the gap 24 of the dynamic pressure bearing 31. A ring-shaped permanent magnet 35A is provided on the axis A inside the center of the upper cover that covers the upper part of the polygon scanner 21. 35A permanent magnet,
The surfaces 35B and 35C are arranged so that the surfaces facing each other have the same polarity, repel each other and come into non-contact, and support the hollow rotary body 25 in the axial direction. Space in the center of mirror holder 28
A fine hole 38 is provided for communicating between 36 and the outside of the hollow rotator 25, and the fine hole 38 prevents vertical vibration of the hollow rotator 25.
It controls the inflow and outflow of air into the space 36, which is the upper space in the hollow rotating body 25, and exerts a vibration damping effect.
The permanent magnet 35 and the fine hole 38 constitute a thrust bearing structure 39 that supports the hollow rotary body 25 in the axial direction.
【００１７】41は挿入部材である凸部材であり、凸部材
41は非磁性体からなり空間36の一部に挿入され、円板状
の基部41ａと、基部41ａの上側に一体的に連結し基部41
ａより小径で突出した先端部41ｂを有する凸形状体であ
る。凸部材41の基部41ａは２つの永久磁石35の一方であ
る固定軸23側の永久磁石35Ｃの内周に固定され、先端部
41ｂは中空回転体25の上部の他方の永久磁石35Ｂの内周
内に凸形状に突出している。凸部材41は基部41ａの外径
は永久磁石35Ｃの内径Ｄ1 と一致し、先端部41ｂの外径
は永久磁石35Ｃの内径Ｄ1 より小さく、中空回転体25の
振動時にも永久磁石35Ｂの内周に接触しないようになさ
れている。凸部材41は凸部材41の軸線Ａ方向の先端部41
ｂの端末41ｃと、端末41ｃに対向する部材であるミラー
押え28の中央部の内側との間隙Ｚ3 が中空回転体25の下
端25ａと台座22の間隙Ｚ1 よりも大きくなるようになさ
れている。Reference numeral 41 denotes a convex member which is an insertion member.
41 is made of a non-magnetic material, is inserted into a part of the space 36, and is integrally connected to a disc-shaped base 41a and an upper side of the base 41a.
It is a convex body having a tip portion 41b projecting with a smaller diameter than a. The base 41a of the convex member 41 is fixed to the inner periphery of the permanent magnet 35C on the fixed shaft 23 side, which is one of the two permanent magnets 35,
41b protrudes in a convex shape into the inner periphery of the other permanent magnet 35B on the upper part of the hollow rotating body 25. In the convex member 41, the outer diameter of the base 41a matches the inner diameter D1 of the permanent magnet 35C, the outer diameter of the tip 41b is smaller than the inner diameter D1 of the permanent magnet 35C, and the inner circumference of the permanent magnet 35B even when the hollow rotor 25 vibrates. It is made so that it does not come into contact with. The convex member 41 is a front end portion 41 of the convex member 41 in the direction of the axis A.
The gap Z3 between the terminal 41c of b and the inside of the center of the mirror retainer 28, which is a member facing the terminal 41c, is made larger than the gap Z1 between the lower end 25a of the hollow rotator 25 and the pedestal 22.
【００１８】また、中空回転体25の振動時の共振点を通
常の方法により調べたところ、振動曲線は図２の曲線Ａ
に示すように、従来の曲線Ｂに対し、振幅は約1/2 に減
少し、共振点も実用域外の50Ｈｚ以上へと回避したもの
であった。次に、作用について説明する。本発明では、
凸部材41が非磁性体からなり、空間36の一部に挿入さ
れ、固定軸23側の上部に固定されているので、空間36の
空間の空気の容積は凸部材41の容積分だけ減少してお
り、中空回転体25の振動により膨張、圧縮する空気の容
量は減少し、空気剛性はその分増加する。また、中空回
転体25の振動の共振点は図１（ｂ）に示すように、従来
より大きく、通常の外部振動の周波数より大きく、振幅
も半分以下である。このため、外部振動による中空回転
体25の振動は大幅に抑制され、ポリゴンスキャナ21の耐
振性が大幅に増加する。When the resonance point of the hollow rotary body 25 during vibration was examined by a usual method, the vibration curve was shown by a curve A in FIG.
As shown in FIG. 7, the amplitude is reduced to about 1/2 with respect to the conventional curve B, and the resonance point is avoided to be 50 Hz or more outside the practical range. Next, the operation will be described. In the present invention,
Since the convex member 41 is made of a non-magnetic material, is inserted into a part of the space 36, and is fixed to the upper portion on the fixed shaft 23 side, the volume of air in the space 36 decreases by the volume of the convex member 41. As a result, the volume of air that expands and compresses due to the vibration of the hollow rotating body 25 decreases, and the air rigidity increases accordingly. Further, as shown in FIG. 1B, the resonance point of the vibration of the hollow rotating body 25 is larger than the conventional one, is larger than the frequency of the normal external vibration, and the amplitude is half or less. Therefore, the vibration of the hollow rotating body 25 due to the external vibration is greatly suppressed, and the vibration resistance of the polygon scanner 21 is greatly increased.
【００１９】また、凸部材41が凸形状体で凸部材41の基
部41ａが永久磁石35Ｃの内周に固定されているので、ポ
リゴンスキャナ21への着脱が永久磁石35Ｃと同時にで
き、組立て脱着が容易になる。また、凸部材41は基部41
ａが回転軸26側の永久磁石35Ｃの内周に固定され、先端
部41ｂが中空回転体25側の永久磁石35Ｂの内周内に突出
し、永久磁石35Ｂの内周に接触しないように先端部41ｂ
の外径を小さくしているので、凸部材41の先端部41ｂの
分だけ空間36の内の空気の容積がさらに減少し、空気剛
性がさらに高くなり、ポリゴンスキャナ21の耐振性がさ
らに向上するとともに、凸形状の径差分だけ、これら部
分の工作寸法のバラツキを緩和できる。Also, since the convex member 41 is a convex body and the base 41a of the convex member 41 is fixed to the inner periphery of the permanent magnet 35C, it can be attached to and detached from the polygon scanner 21 at the same time as the permanent magnet 35C. It will be easier. Further, the convex member 41 has a base 41.
a is fixed to the inner periphery of the permanent magnet 35C on the rotating shaft 26 side, and the tip portion 41b projects into the inner periphery of the permanent magnet 35B on the hollow rotating body 25 side so as not to contact the inner periphery of the permanent magnet 35B. 41b
Is reduced, the volume of air in the space 36 is further reduced by the amount of the tip 41b of the convex member 41, the air rigidity is further increased, and the vibration resistance of the polygon scanner 21 is further improved. with, only the diameter difference between the convex, it can alleviate variations in work dimensions of these parts.
【００２０】また、凸部材41は先端部41ｂの端末41ｃと
ミラー押え28の中央の内側の間隙Ｚ3 が中空回転体25の
下端25ａと台座22のＺ1 より大きいので、たとえ、中空
回転体25が振動で接触しても間隙の小さい中空回転体25
の下端25ａと台座22とが接触するのみであり、空間36内
の固定軸23側と中空回転体側との接触は回避できる。こ
のため、スラスト軸受構造39内部での接触による金属粉
の発生および、これによる焼き付き等の発生が防止でき
る。Further, since the gap Z3 inside the center of the end portion 41c of the tip portion 41b and the mirror retainer 28 is larger than the lower end 25a of the hollow rotator 25 and Z1 of the pedestal 22, the convex member 41 has, for example, Hollow rotating body 25 with small gap even if contacted by vibration
Only the lower end 25a of the shaft comes into contact with the pedestal 22, and the contact between the fixed shaft 23 side in the space 36 and the hollow rotating body side can be avoided. For this reason, the generation of metal powder due to contact inside the thrust bearing structure 39 and the occurrence of seizure or the like due to this can be prevented.
【００２１】また、中空回転体25の振動特性が、図１
（ｂ）の曲線Ａに示すように、振幅が従来の約１／２と
なり共振点も実用域の50Ｈｚ以上となり耐振性が大幅に
向上し、輸送時の安全性が大幅に向上する。次に、本発
明の第２実施例を説明する。図２は、本発明の第２実施
例に係るポリゴンスキャナのスラスト軸受構造を示す図
で、第１実施例と同じ構成には同じ符号をつける。The vibration characteristics of the hollow rotating body 25 are shown in FIG.
As shown by the curve A in (b), the amplitude becomes about 1/2 of the conventional one, and the resonance point becomes 50 Hz or more in the practical range, so that the vibration resistance is greatly improved and the safety during transportation is greatly improved. Next, a second embodiment of the present invention will be described. Figure 2 is a second embodiment of the present invention
The figure which shows the thrust bearing structure of the polygon scanner which concerns on an example.
The same components as those in the first embodiment are denoted by the same reference numerals.
【００２２】本実施例において、ポリゴンスキャナ50の
凸部材51は、基部51ａが中空回転体25側のミラー押え28
に固定された永久磁石35Ｂの内周に固定され、先端部51
ｂが固定軸23側の永久磁石35Ｃの内周内に突出し、微細
穴38を通って外部に連通する軸孔51ｃを有する場合であ
る。上記以外は第１実施例と同じである。このポリゴン
スキャナ50では空間36内の空気は軸孔51ｃおよび微細穴
38を通って中空回転体25外に流出入するので、空気の流
動抵抗は軸孔51ｃの長さの分だけさらに大きくなり、空
気の流出入はさらに抑制され、中空回転体25の耐振性は
さらに向上する。In the present embodiment, the convex member 51 of the polygon scanner 50 has a base 51a having a mirror holder 28 on the hollow rotary body 25 side.
Fixed to the inner periphery of the permanent magnet 35B fixed to the
b has a shaft hole 51c protruding into the inner periphery of the permanent magnet 35C on the fixed shaft 23 side and communicating with the outside through the fine hole 38. Other than the above, it is the same as the first embodiment. In the polygon scanner 50, the air in the space 36 is separated from the shaft hole 51c and the minute hole.
Since the air flows into and out of the hollow rotary body 25 through 38, the flow resistance of air is further increased by the length of the shaft hole 51c, and the flow of air is further suppressed, and the vibration resistance of the hollow rotary body 25 is improved. Further improve.
【００２３】次に、本発明の第３、４実施例につき説明
する。図３（ａ）および図３（ｂ）は、本発明の第３実
施例および第４実施例に係るポリゴンスキャナのスラス
ト軸受構造の要部をそれぞれ示す図で、第１実施例と同
じ構成には同じ符号をつける。Next, third and fourth embodiments of the present invention will be described. FIGS. 3A and 3B show a third embodiment of the present invention.
Thrust of polygon scanner according to the embodiment and the fourth embodiment
FIG. 4 is a view showing a main part of a bearing structure, and the same components as those in the first embodiment are denoted by the same reference numerals.
【００２４】第３、４実施例においては、それぞれ第
１、２実施例における凸部材が磁性体からなる場合であ
り、他はそれぞれ第１、２実施例と同じである。第３実
施例を適用したポリゴンスキャナ60は、凸部材61が磁性
体からなり、永久磁石35Ｃの内周に一体的に形成された
場合であり、凸部材61が永久磁石35と一体的に形成でき
るので、第１実施例の作用効果の外に、部品数を減少で
きる。また、第４実施例を適用したポリゴンスキャナ70
は、凸部材71が磁性体からなり、中空回転体25側の永久
磁石35Ｂの内周に一体的に形成された場合であり、前述
同様に、第２実施例の作用効果の外に部品数を減少でき
る。The third and fourth embodiments are the same as the first and second embodiments, except that the convex members in the first and second embodiments are made of a magnetic material. The polygon scanner 60 to which the third embodiment is applied is a case where the convex member 61 is made of a magnetic material and is formed integrally with the inner periphery of the permanent magnet 35C, and the convex member 61 is formed integrally with the permanent magnet 35. Therefore, the number of parts can be reduced in addition to the effects of the first embodiment. Also, a polygon scanner 70 to which the fourth embodiment is applied.
This is the case where the convex member 71 is made of a magnetic material and is integrally formed on the inner periphery of the permanent magnet 35B on the side of the hollow rotary body 25. Can be reduced.
【００２５】次に、本発明の第５実施例につき説明す
る。図３（ｃ）は、本発明の第５実施例に係るポリゴン
スキャナのスラスト軸受構造を示す図で、第１実施例と
同じ構成には同じ符号をつける。本実施例のポリゴンス
キャナ80は、挿入部材が２つの磁石体からなり、固定軸
23側の永久磁石35Ｃの内周に一体的に固定され全体的に
円板状となる円板材81と、円板材81に対向し中空回転体
25側の永久磁石35Ｂの内周に一体的に固定され、外部に
連通する軸孔82ａを有する環状材82とからなる場合であ
る。他は第１実施例と同じである。この場合、空間36に
挿入された円板材81と環状材82の容積分だけ空気容積が
減少し、この分空気剛性が高くなるとともに、円板材81
と環状材82の対向する磁石体の面積の増加分だけ磁気的
な反発力が増加し、微細穴38の軸受剛性を格段に向上で
き、ポリゴンスキャナ80の耐振性を大幅に向上できる。Next, a fifth embodiment of the present invention will be described. FIG. 3 (c), a diagram showing the thrust bearing structure of the polygon scanner according to a fifth embodiment of the present invention, the same components as the first embodiment given the same reference numerals. In the polygon scanner 80 of this embodiment , the insertion member is formed of two magnets,
A disk member 81 integrally fixed to the inner periphery of the permanent magnet 35C on the 23 side and having a disk shape as a whole, and a hollow rotating body opposed to the disk material 81
This is a case where the annular member 82 is integrally fixed to the inner periphery of the 25-side permanent magnet 35B and has a shaft hole 82a communicating with the outside. Others are the same as the first embodiment. In this case, the air volume is reduced by the volume of the disk member 81 and the annular member 82 inserted into the space 36, and the air rigidity is increased by this amount, and the disk member 81
The magnetic repulsive force increases by an amount corresponding to the increase in the area of the magnet body opposed to the annular member 82, the bearing rigidity of the minute hole 38 can be remarkably improved, and the vibration resistance of the polygon scanner 80 can be greatly improved.
【００２６】次に、本発明の第６実施例を説明する。図
４（ａ）は本発明の第６実施例に係るポリゴンスキャナ
のスラスト軸受構造の要部を示す図で、第１実施例と同
じ構成には同じ符号をつける。本実施例のポリゴンスキ
ャナ90は、挿入部材が非磁性体からなり、固定軸23側の
永久磁石35Ｃの永久磁石35Ｂ側の上面を、円板状体91で
閉止した場合である。空間36が円板状体91および円板状
体91で閉止された永久磁石35Ｃの内周内の容積分だけ減
少するので、この分に対応する空気剛性が高くなる。Next, a sixth embodiment of the present invention will be described. FIG. 4A is a view showing a main part of a thrust bearing structure of a polygon scanner according to a sixth embodiment of the present invention. The same reference numerals are given to the same components as those in the first embodiment. Polygon scanner 90 of this embodiment, the insertion member is made of non-magnetic material, a permanent magnet 35B side of the upper surface of the stationary shaft 23 side of the permanent magnet 35C, a case in which closed with a disc-shaped body 91. Since the space 36 is reduced by the volume within the inner periphery of the disk-shaped body 91 and the permanent magnet 35C closed by the disk-shaped body 91, the air rigidity corresponding to this is increased.
【００２７】円板状体91で永久磁石35Ｃの上面を閉止す
るという簡単な構成により、空気剛性を高くできる。ま
た、永久磁石35Ｃの上面を円板状体91で閉止する代わり
に、永久磁石35Ｃの内周内に請求項８に記載のように、
接着剤を充填することによっても同じ作用効果を得るこ
とができる。次に、本発明の第７実施例を説明する。With a simple structure in which the upper surface of the permanent magnet 35C is closed by the disk-shaped body 91, air rigidity can be increased. Further, instead of closing the upper surface of the permanent magnet 35C with the disk-shaped body 91, the inner surface of the permanent magnet 35C may be formed as follows.
The same effect can be obtained by filling with an adhesive. Next, a seventh embodiment of the present invention will be described.
【００２８】図４（ｂ）は、本発明の第７実施例に係る
ポリゴンスキャナのスラスト軸受構造を示す図で、第１
実施例と同じ構成には同じ符号をつける。本実施例のポ
リゴンスキャナ100 は、挿入部材が非磁性体からなり、
固定軸23側の永久磁石35Ｃの内周に固定され内周内を充
填する円板体101 と、永久磁石35Ｃの外周に固定された
リング102 とからなる場合である。これ以外は第１実施
例と同じである。この場合、円板体101 およびリング10
2 を設けることにより、上部の空間36の一部を占めて、
空間36内の空気の容積を減少することにより、前述同様
に空気剛性を高め耐振性を向上させるとともに、永久磁
石35Ｃの内周および外周の露出した磁性体を覆うので、
永久磁石35の露出面積を大幅に減少でき、磁性粉の飛散
を極力防止できる。[0028] FIG. 4 (b), a diagram showing the thrust bearing structure of the polygon scanner according to a seventh embodiment of the present invention, the first
The same components as those of the embodiment are denoted by the same reference numerals. In the polygon scanner 100 of the present embodiment , the insertion member is made of a non-magnetic material,
In this case, a disk 101 is fixed to the inner periphery of the permanent magnet 35C on the fixed shaft 23 side and fills the inner periphery, and a ring 102 is fixed to the outer periphery of the permanent magnet 35C. The rest is the same as the first embodiment. In this case, the disc 101 and the ring 10
2 to occupy a part of the upper space 36,
By reducing the volume of air in the space 36, the air rigidity is improved and the vibration resistance is improved as described above, and the exposed inner and outer magnetic materials of the permanent magnet 35C are covered.
The exposed area of the permanent magnet 35 can be greatly reduced, and scattering of the magnetic powder can be prevented as much as possible.
【００２９】[0029]
【発明の効果】以上説明したように、請求項１、２記載
の発明によれば、アキシャル磁気軸受を構成する固定軸
の上部および中空回転体の上部の間の振動減衰用の上部
空間にリング状の永久磁石を設け、その磁石内空間の一
部に非磁性体、または磁性体からなる挿入部材を挿入し
ているので、上部空間内の空気容積を少なくして空気剛
性を高め、耐振性を向上させることができる。さらに、
請求項３、４記載の発明によれば、それぞれ挿入部材の
形状を特定することにより製造精度がばらついても固定
軸側および中空回転軸側の部材間接触を防止することが
でき、請求項５記載の発明によれば、挿入部材に連通孔
を設けることによりダンピング効果を増加して耐振性を
さらに向上させることができる。また、請求項６記載の
発明によれば、磁性体からなる挿入部材を用いることに
より、部品数の増加を抑制し、さらにまた、円板状にし
て互いに反発させることにより、耐振性をさらに大幅に
向上させることができ、請求項７、８記載の発明によれ
ば、挿入部材の固定場所を特定して、または部材を特定
して簡単に耐振性を向上できる。As described above, claims 1 and 2 are described.
According to the invention , a ring-shaped permanent magnet is provided in an upper space for vibration damping between the upper part of the fixed shaft and the upper part of the hollow rotary body constituting the axial magnetic bearing, and a non-magnetic permanent magnet is provided in a part of the inner space of the magnet. Since the insertion member made of the body or the magnetic body is inserted, the air volume in the upper space can be reduced, the air rigidity can be increased, and the vibration resistance can be improved. further,
According to the third and fourth aspects of the present invention , the shape of the insertion member is specified to fix even if the manufacturing accuracy varies.
It is possible to prevent contact between members on the shaft side and the hollow rotating shaft side.
According to the invention as set forth in claim 5 , by providing a communication hole in the insertion member, the damping effect can be increased and the vibration resistance can be further improved. Further, according to claim 6, wherein
According to the present invention , by using an insertion member made of a magnetic material, the increase in the number of components is suppressed, and furthermore, by repelling each other in a disk shape, vibration resistance can be further greatly improved , according to the invention of claim 7,8, wherein, to identify the fixed location of the insert member, or members can be improved easily vibration resistance to identify the.
【図１】本発明のポリゴンスキャナのスラスト軸受構造
の第１実施例を適用したレーザプリンタの超高速ポリゴ
ンスキャナを示す図で、（ａ）はその全体説明図、
（ｂ）はその振動特性を示すグラフである。FIG. 1 is a view showing an ultra-high-speed polygon scanner of a laser printer to which a first embodiment of a thrust bearing structure of a polygon scanner according to the present invention is applied, wherein FIG.
(B) is a graph showing the vibration characteristics.
【図２】本発明のポリゴンスキャナのスラスト軸受構造
の第２実施例を適用した超高速ポリゴンスキャナの全体
説明図である。FIG. 2 is an overall explanatory view of an ultra-high-speed polygon scanner to which a second embodiment of the thrust bearing structure of the polygon scanner according to the present invention is applied.
【図３】本発明のポリゴンスキャナのスラスト軸受構造
の第３〜５実施例を適用した超高速ポリゴンスキャナを
示す図で、（ａ）〜（ｃ）はそれぞれその要部を示す説
明図である。FIG. 3 is a view showing an ultra-high-speed polygon scanner to which the third to fifth embodiments of the thrust bearing structure of the polygon scanner according to the present invention are applied, and (a) to (c) are explanatory views each showing a main part thereof. .
【図４】本発明のポリゴンスキャナのスラスト軸受構造
の第６、７実施例を適用した超高速ポリゴンスキャナを
示す図で、（ａ）、（ｂ）はそれぞれその要部を示す説
明図である。FIG. 4 is a view showing an ultra-high-speed polygon scanner to which the sixth and seventh embodiments of the thrust bearing structure of the polygon scanner according to the present invention are applied, and FIGS. .
【図５】従来のポリゴンスキャナのスラスト軸受構造を
示す図で、（ａ）、（ｂ）はそれぞれその全体を示す説
明図である。FIGS. 5A and 5B are views showing a thrust bearing structure of a conventional polygon scanner, and FIGS. 5A and 5B are explanatory views showing the entire structure.
21、50、60、70、80、90、100 ポリゴンスキャナ 23 固定軸 25 中空回転体 27 ポリゴンミラー 35、35Ａ、35Ｂ、35Ｃ 永久磁石 36 空間（磁石内空間、上部空間） 39 スラスト軸受構造 41、51、61、71 凸部材（挿入部材） 81 円板材（挿入部材） 82 環状材（挿入部材） 91 円板状体（挿入部材） 101 円板体（挿入部材） 102 リング（挿入部材）21, 50, 60, 70, 80, 90, 100 Polygon scanner 23 Fixed shaft 25 Hollow rotating body 27 Polygon mirror 35, 35A, 35B, 35C Permanent magnet 36 Space (space inside magnet, upper space) 39 Thrust bearing structure 41, 51, 61, 71 Convex member (insert member) 81 Disc member (insert member) 82 Ring member (insert member) 91 Disc member (insert member) 101 Disc member (insert member) 102 Ring (insert member)
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 平２−119216（ＪＰ，Ｕ) 実開 昭50−137453（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16C 32/00 - 32/06 G02B 26/10 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 2-119216 (JP, U) JP-A 50-137453 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F16C 32/00-32/06 G02B 26/10
Claims (8)
で回転可能な中空回転体の上部との間に振動減衰作用を
なすよう空気を流出入させることができる上部空間を備
え、前記固定軸と同一軸線上に上下に配置されたリング
状の永久磁石のうち少なくとも２つをそれぞれ前記中空
回転軸の上部と前記固定軸の上部に固定し、前記上下の
永久磁石の内周により磁石内空間を形成して、アキシャ
ル方向の磁気軸受の一部を構成するポリゴンスキャナの
スラスト軸受構造において、非磁性体または磁性体から
なり、前記磁石内空間の一部に挿入された少なくとも１
つの挿入部材を前記固定軸側または前記中空回転体側に
固定し、前記磁石内空間の容積を減少させることにより
前記上部空間内の空気剛性を高くしたことを特徴とする
ポリゴンスキャナのスラスト軸受構造。1. An upper portion of a cylindrical fixed shaft and an outer periphery of the fixed shaft.
Vibration damping action with the upper part of the hollow rotating body
There is an upper space that allows air to flow in and out
Further, at least two of the ring-shaped permanent magnets arranged vertically on the same axis as the fixed shaft are fixed to the upper part of the hollow rotary shaft and the upper part of the fixed shaft, respectively, and among the upper and lower permanent magnets, In the thrust bearing structure of the polygon scanner that forms a part of the axial direction magnetic bearing by forming a space inside the magnet by the circumference, at least a part that is made of a non-magnetic material or a magnetic material and is inserted into a part of the space inside the magnet 1
By fixing one insertion member to the fixed shaft side or the hollow rotating body side, and reducing the volume of the magnet internal space,
A thrust bearing structure for a polygon scanner, wherein air rigidity in the upper space is increased .
なくとも片方の内周または外周に固定されていることを
特徴とする請求項１記載のポリゴンスキャナのスラスト
軸受構造。2. The thrust bearing structure for a polygon scanner according to claim 1, wherein the insertion member is fixed to at least one of the inner and outer peripheries of the upper and lower permanent magnets.
なくとも一方の内周に固定され他方の内周内に凸形状に
突出していることを特徴とする請求項１または２記載の
ポリゴンスキャナのスラスト軸受構造。3. The polygon scanner according to claim 1, wherein the insertion member is fixed to an inner periphery of at least one of the two permanent magnets and protrudes into the other inner periphery in a convex shape. Thrust bearing structure.
可能な中空回転体とを備え、前記固定軸と同一軸線上に
上下に配置されたリング状の永久磁石のうち少なくとも
２つをそれぞれ前記中空回転軸の上部と前記固定軸の上
部に固定し、前記上下の永久磁石の内周により磁石内空
間を形成して、アキシャル方向の磁気軸受の一部を構成
するポリゴンスキャナのスラスト軸受構造において、非
磁性体または磁性体からなり、前記磁石内空間の一部に
挿入された少なくとも１つの挿入部材を前記固定軸側ま
たは前記中空回転体側に固定し、該空間内の空気剛性を
高くするとともに、前記挿入部材の軸線方向の端末と該
端末に対向する部材の間隔を、前記中空回転体の下端と
前記固定軸を固定する台座の間隔よりも大きくしたこと
を特徴とするポリゴンスキャナのスラスト軸受構造。 4. A cylindrical fixed shaft and a rotation around an outer periphery of the fixed shaft.
Possible hollow rotor, and on the same axis as the fixed shaft.
At least one of the ring-shaped permanent magnets
Two above the hollow rotating shaft and above the fixed shaft, respectively.
And the inner space of the upper and lower permanent magnets
Form a part of an axial magnetic bearing
In the thrust bearing structure of the polygon scanner
It is made of a magnetic material or a magnetic material.
Insert at least one inserted member to the fixed shaft side.
Or fixed to the hollow rotating body side to reduce the air rigidity in the space.
And the end of the insertion member in the axial direction and the
The interval between the members facing the terminal, the lower end of the hollow rotating body and
The distance between the pedestals for fixing the fixed shaft is larger than that of the pedestal.
The thrust bearing structure of the polygon scanner characterized by the above.
なくとも一方の内周に固定され外部に連通する軸孔を有
することを特徴とする請求項１、２または３記載のポリ
ゴンスキャナのスラスト軸受構造。5. The thrust bearing of the insertion member is a polygon scanner according to claim 1, wherein characterized in that it has a shaft hole communicating with the outside is fixed to an inner periphery of at least one of two of said permanent magnets Construction.
可能な中空回転体とを備え、前記固定軸と同一軸線上に
上下に配置されたリング状の永久磁石のうち少なくとも
２つをそれぞれ前記中空回転軸の上部と前記固定軸の上
部に固定し、前記上下の永久磁石の内周により磁石内空
間を形成して、アキシャル方向の磁気軸受の一部を構成
するポリゴンスキャナのスラスト軸受構造において、非
磁性体または磁性体からなり、前記磁石内空間の一部に
挿入された複数の挿入部材のうち１つは前記固定軸側の
永久磁石の内周に一体的に形成され、全体として円板状
をなし、他の１つは前記中空回転体側の永久磁石の内周
に固定され外部に連通する軸孔を有する環状体とし、前
記磁石内空間の容積を減少させることにより該空間内の
空気剛性を高くしたことを特徴とするポリゴンスキャナ
のスラスト軸受構造。 6. A cylindrical fixed shaft and a rotation around the outer periphery of the fixed shaft.
Possible hollow rotor, and on the same axis as the fixed shaft.
At least one of the ring-shaped permanent magnets
Two above the hollow rotating shaft and above the fixed shaft, respectively.
And the inner space of the upper and lower permanent magnets
Form a part of an axial magnetic bearing
In the thrust bearing structure of the polygon scanner
It is made of a magnetic material or a magnetic material.
One of the inserted plurality of inserted members is the fixed shaft side.
It is formed integrally with the inner circumference of the permanent magnet and has a disk shape as a whole.
And the other one is the inner circumference of the permanent magnet on the side of the hollow rotor.
To an annular body with a shaft hole that is fixed to
By reducing the volume of the space inside the magnet,
Polygon scanner characterized by increased air rigidity
Thrust bearing structure.
可能な中空回転体とを備え、前記固定軸と同一軸線上に
上下に配置されたリング状の永久磁石のうち少なくとも
２つをそれぞれ前記中空回転軸の上部と前記固定軸の上
部に固定し、前記上下の永久磁石の内周により磁石内空
間を形成して、アキシャル方向の磁気軸受の一部を構成
するポリゴンスキャナのスラスト軸受構造において、前
記固定軸側の永久磁石の上面を閉止する円板状体を設
け、前記磁石内空間の容積を減少させることにより該空
間内の空気剛性を高くしたことを特徴とするポリゴンス
キャナのスラスト軸受構造。 7. A cylindrical fixed shaft and a rotation around the outer periphery of the fixed shaft.
Possible hollow rotor, and on the same axis as the fixed shaft.
At least one of the ring-shaped permanent magnets
Two above the hollow rotating shaft and above the fixed shaft, respectively.
And the inner space of the upper and lower permanent magnets
Form a part of an axial magnetic bearing
In the thrust bearing structure of a polygon scanner
A disk-shaped body that closes the upper surface of the permanent magnet on the fixed shaft side is provided.
The space inside the magnet by reducing the volume of the space inside the magnet.
Polygons characterized by increased air stiffness in the space
Thrust bearing structure of canna.
可能な中空回転体とを備え、前記固定軸と同一軸線上に
上下に配置されたリング状の永久磁石のうち少なくとも
２つをそれぞれ前記中空回転軸の上部と前記固定軸の上
部に固定し、前記上下の永久磁石の内周により磁石内空
間を形成して、アキシャル方向の磁気軸受の一部を構成
するポリゴンスキャナのスラスト軸受構造において、前
記固定軸側の永久磁石の内周面側に接着剤を充填し、前
記磁石内空間の容積を減少させることにより該空間内の
空気剛性を高くしたことを特徴とするポリゴンスキャナ
のスラスト軸受構造。 8. A cylindrical fixed shaft and a rotation around the outer periphery of the fixed shaft.
Possible hollow rotor, and on the same axis as the fixed shaft.
At least one of the ring-shaped permanent magnets
Two above the hollow rotating shaft and above the fixed shaft, respectively.
And the inner space of the upper and lower permanent magnets
Form a part of an axial magnetic bearing
In the thrust bearing structure of a polygon scanner
Fill the inner peripheral side of the permanent magnet on the fixed shaft side with adhesive
By reducing the volume of the space inside the magnet,
Polygon scanner characterized by increased air rigidity
Thrust bearing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06363991A JP3165457B2 (en) | 1991-03-28 | 1991-03-28 | Thrust bearing structure of polygon scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06363991A JP3165457B2 (en) | 1991-03-28 | 1991-03-28 | Thrust bearing structure of polygon scanner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04300418A JPH04300418A (en) | 1992-10-23 |
| JP3165457B2 true JP3165457B2 (en) | 2001-05-14 |
Family
ID=13235130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06363991A Expired - Fee Related JP3165457B2 (en) | 1991-03-28 | 1991-03-28 | Thrust bearing structure of polygon scanner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3165457B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101764421B1 (en) * | 2013-07-24 | 2017-08-02 | 얀마 가부시키가이샤 | Work Vehicle |
-
1991
- 1991-03-28 JP JP06363991A patent/JP3165457B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101764421B1 (en) * | 2013-07-24 | 2017-08-02 | 얀마 가부시키가이샤 | Work Vehicle |
| US10369921B2 (en) | 2013-07-24 | 2019-08-06 | Yanmar Co., Ltd. | Work vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04300418A (en) | 1992-10-23 |
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