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JP4396503B2 - Rotating polygon mirror drive - Google Patents
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JP4396503B2 - Rotating polygon mirror drive - Google Patents

Rotating polygon mirror drive Download PDF

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JP4396503B2
JP4396503B2 JP2004359431A JP2004359431A JP4396503B2 JP 4396503 B2 JP4396503 B2 JP 4396503B2 JP 2004359431 A JP2004359431 A JP 2004359431A JP 2004359431 A JP2004359431 A JP 2004359431A JP 4396503 B2 JP4396503 B2 JP 4396503B2
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Prior art keywords
polygon mirror
leaf spring
rotary polygon
rotating
rotary
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JP2006171050A (en
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茂樹 藤井
圭吾 松本
昭英 松尾
康雄 佐伯
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

本発明は、レーザプリンタなどでレーザのスキャンに利用される回転多面鏡駆動装置に係るもので、詳しくは、その回転多面鏡の固定構造に関するものである。   The present invention relates to a rotary polygon mirror driving device used for laser scanning in a laser printer or the like, and more particularly to a fixing structure of the rotary polygon mirror.

従来、高速・高精度・低騒音及び長寿命を要求される回転多面鏡駆動装置にあって、その回転多面鏡の固定に図７の構造を採用していた。すなわち、図７において、回転多面鏡２１はモータの回転軸２２に挿入されるとともに、この回転軸２２と一体的なボス部２３に下面が支持されるようにしてある。板ばねなどからなる弾性部材２４は前記回転多面鏡２１をボス部２３に押し付ける作用をもつ。   Conventionally, in a rotary polygon mirror drive device that requires high speed, high accuracy, low noise and long life, the structure shown in FIG. 7 has been adopted for fixing the rotary polygon mirror. That is, in FIG. 7, the rotary polygon mirror 21 is inserted into the rotating shaft 22 of the motor, and the lower surface is supported by the boss portion 23 integral with the rotating shaft 22. The elastic member 24 made of a leaf spring or the like has an action of pressing the rotary polygon mirror 21 against the boss portion 23.

つまり、回転多面鏡２１は、ボス部２３と弾性部材２４とによって挟持される形で回転軸２２と一体的に回転するように設定されている。   That is, the rotary polygon mirror 21 is set so as to rotate integrally with the rotary shaft 22 while being sandwiched between the boss portion 23 and the elastic member 24.

前記弾性部材２４は、その中心孔２４ａを回転軸２２に貫通させ、この回転軸２２の途中に形成した環状溝２５に孔縁より突出形成した複数の舌片２４ｂを係止することで軸方向に固定される。前記弾性部材２４の取付けは、舌片２４ｂの弾性を利用しながらその中心孔２４ａに回転軸２２を貫通させればよい。   The elastic member 24 has its central hole 24a penetrated through the rotary shaft 22 and is locked in an annular groove 25 formed in the middle of the rotary shaft 22 with a plurality of tongue pieces 24b formed protruding from the hole edges in the axial direction. Fixed to. The elastic member 24 may be attached by passing the rotating shaft 22 through the center hole 24a while utilizing the elasticity of the tongue piece 24b.

弾性部材２４が回転軸２２に取付けられる際、放射状にのびる複数の弾性脚２４ｃが弾性変形しながら回転多面鏡２１の上面に弾着することとなる。(例えば、特許文献１参照)。
特開昭６１−１７５６１２号公報（第４頁、図１） When the elastic member 24 is attached to the rotating shaft 22, the plurality of radially extending elastic legs 24 c are elastically deformed to the upper surface of the rotary polygon mirror 21. (For example, refer to Patent Document 1).
JP-A-61-175612 (page 4, FIG. 1)

弾性部材２４は平板状ばね材をプレス加工して形成するのが一般的であり、抜きバリ、カエリの発生は避けられない。   The elastic member 24 is generally formed by pressing a flat spring material, and burrs and burrs are inevitable.

そこで、図８，９のように、抜きバリ、カエリの発生する部位２６が上方に位置するごとく弾性部材２４を回転軸２２に取付けるようにしていた。
しかしながら、抜きバリなどが発生する部位２６とは反対側の角部でも、金型精度により均一に仕上げることは難しく、どうしてもエッジ２７が少なからず残ってしまい、完全になくすることは困難である。 Therefore, as shown in FIGS. 8 and 9, the elastic member 24 is attached to the rotary shaft 22 so that the part 26 where the burr and burrs are generated is located above.
However, it is difficult to finish even the corner opposite to the portion 26 where the burr and the like occur due to the accuracy of the mold.

その結果、弾性部材２４の弾性脚２４ｃを弾性変形しながら回転多面鏡２１の上面に弾着する際に、エッジ２７の外周方向摺動時にカジリが発生し、回転多面鏡２１を傷つけてしまう。   As a result, when the elastic legs 24 of the elastic member 24 are elastically deformed and are elastically deformed on the upper surface of the rotary polygon mirror 21, galling occurs when the edge 27 slides in the outer peripheral direction, and the rotary polygon mirror 21 is damaged.

周知のように回転多面鏡２１は高速回転するもので、上記傷つきにより回転多面鏡２１の重量バランスを崩して、振動発生の要因となり、その基本的性能に致命的なダメージを与えることがあった。   As is well known, the rotary polygon mirror 21 rotates at a high speed, and the weight balance of the rotary polygon mirror 21 is lost due to the above-mentioned damage, causing vibrations, which may cause fatal damage to the basic performance. .

また、エッジ２７の存在は、図１０に示すように押圧分布のバラツキ（斜線部分参照）として現れ、回転多面鏡２１を径方向に偏倚させる力が発生し、これまたその基本的性能に悪影響を及ぼす課題があった。   Further, the presence of the edge 27 appears as a variation in the pressure distribution (see the hatched portion) as shown in FIG. 10, generating a force that biases the rotary polygonal mirror 21 in the radial direction, and this adversely affects its basic performance. There was a problem to affect.

本発明は、このような従来の課題を解決するものであり、回転多面鏡を確実に固定し、印字の高精度化などその基本的性能を充分に発揮し得るようにしたものである。   The present invention solves such a conventional problem, and is intended to sufficiently fix the rotary polygon mirror and to sufficiently exhibit its basic performance such as high-precision printing.

本発明は、上記課題を解決するために、モータのロータと連係して回転する支持部に、板ばねの弾性力を介して回転多面鏡を押圧保持し、前記板ばねの回転多面鏡と接する部位は面取りしたもので、エッジの影響をなくしたものである。   In order to solve the above-mentioned problems, the present invention presses and holds the rotating polygon mirror through the elastic force of the leaf spring on the support portion that rotates in conjunction with the rotor of the motor, and makes contact with the rotating polygon mirror of the leaf spring. The part is chamfered and the influence of the edge is eliminated.

本発明の回転多面鏡駆動装置によれば、押圧部材の押圧腕部が面取りされていることで、回転多面鏡を押圧し固定する際、弾性脚部が回転多面鏡面を円滑に径方向外側へ摺動し、カジリ等を発生しない。したがって、回転多面鏡の傷つきがなくなり、加えて、押圧力が回転多面鏡の上面全体に均一に加圧されるので、その鏡面の回転軸に対する平行度に影響を与えることがなく、回転多面鏡の面倒れが増加せず、印字精度の向上等、その性能を充分に発揮させることができる。   According to the rotating polygon mirror driving device of the present invention, the pressing arm portion of the pressing member is chamfered, so that when the rotating polygon mirror is pressed and fixed, the elastic legs smoothly move the rotating polygon mirror surface radially outward. Slides and does not generate galling. Therefore, the rotating polygon mirror is not damaged, and in addition, the pressing force is uniformly applied to the entire upper surface of the rotating polygon mirror, so that the parallelism with respect to the rotation axis of the mirror surface is not affected, and the rotating polygon mirror is not affected. Therefore, it is possible to sufficiently exhibit the performance such as improvement of printing accuracy.

本発明の実施の形態は、モータのロータと連係して回転する支持部に、板ばねの弾性力を介して回転多面鏡を押圧保持し、前記板ばねの回転多面鏡と接する部位は面取りを施したものである。   In the embodiment of the present invention, the rotating polygon mirror is pressed and held on the support portion that rotates in conjunction with the rotor of the motor via the elastic force of the leaf spring, and the portion of the leaf spring that contacts the rotating polygon mirror is chamfered. It has been applied.

したがって、回転多面鏡上面に接触する部分でカジリなどが発生せず、回転多面鏡に対する押圧力が全体に均一作用することとなる。   Accordingly, galling or the like does not occur at the portion that contacts the upper surface of the rotating polygon mirror, and the pressing force on the rotating polygon mirror acts uniformly on the entire surface.

さらに具体的には、上記支持部はロータと一体的に構成され、中心部がモータの軸に係止された板ばねには回転多面鏡に弾接する複数の放射状弾性脚を形成したもので、複数の放射状弾性脚により回転多面鏡への押圧力がより均等に加わることになる。   More specifically, the support portion is configured integrally with the rotor, and a leaf spring whose center portion is locked to the shaft of the motor is formed with a plurality of radial elastic legs that elastically contact the rotary polygon mirror. The pressing force to the rotating polygon mirror is applied more evenly by the plurality of radial elastic legs.

弾性脚の面取りは、例えば、バレル処理により行うことが考えられる。   For example, the chamfering of the elastic leg may be performed by barrel processing.

そして、実施形態の回転多面鏡駆動装置をレーザプリンタの画像形成部に搭載すれば、高精度な印字精度を実現でき、さらに複写機の画像形成部に搭載すれば高精度な複写精度を実現できる。   If the rotary polygon mirror driving device of the embodiment is mounted on the image forming unit of the laser printer, high-precision printing accuracy can be realized, and if it is mounted on the image forming unit of the copying machine, high-precision copying accuracy can be realized. .

以下本発明の実施例について図面を用いて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

（実施例１）
図１〜図４において、モータ１におけるステータ２の外側に配置されたロータ３は、ボス状の支持部４を介して回転軸５に連係している。そしてアルミニウム製の回転多面鏡６が上記支持部４に板ばね７の弾性力を利用して固定されている。 Example 1
1 to 4, the rotor 3 disposed outside the stator 2 in the motor 1 is linked to the rotary shaft 5 via a boss-like support portion 4. A rotating polygon mirror 6 made of aluminum is fixed to the support portion 4 using the elastic force of the leaf spring 7.

さらに詳述すると、板ばね７は、中心に軸孔８を形成したばね主体部９と、この主体部９から放射状にのびるとともに、それぞれ下方向に湾曲させた複数の弾性脚１０とからなる。そして、軸孔８を回転軸５に通して各弾性脚１０が回転多面鏡６の上面に弾性変形するまで押圧し、その後、ワッシャー１１を回転軸５に係止して主体部９が上方復元変位するのを阻止するようにする。その結果、回転多面鏡６は、支持部４と板ばね７との間に挟持されるものである。   More specifically, the leaf spring 7 includes a spring main body 9 having a shaft hole 8 formed at the center thereof, and a plurality of elastic legs 10 extending radially from the main body 9 and curved downward. Then, the shaft hole 8 is passed through the rotating shaft 5 and pressed until each elastic leg 10 is elastically deformed on the upper surface of the rotating polygonal mirror 6, and then the washer 11 is locked to the rotating shaft 5 so that the main body 9 is restored upward. Try to prevent displacement. As a result, the rotary polygon mirror 6 is sandwiched between the support portion 4 and the leaf spring 7.

もちろん、板バネ７における主体部９の回転軸５に対する保持は、従来と同様に軸孔８から突出形成した舌片を回転軸５の環状溝に係止するものでもよく、特定の構成に限定されるものではない。   Of course, the holding of the main body 9 on the rotating shaft 5 in the leaf spring 7 may be achieved by locking the tongue piece protruding from the shaft hole 8 in the annular groove of the rotating shaft 5 as in the conventional case, and is limited to a specific configuration. Is not to be done.

ところで、板ばね７は金属製板ばね材をプレス加工により形成し、バレル処理にて面取りを施している。図２及び図３に示すように、各弾性脚１０の回転多面鏡６と接触する先端角部は、バレル処理の結果、滑らかな面取り部１２が施され、抜きバリ、カエリも除去される。   By the way, the leaf spring 7 is formed by pressing a metal leaf spring material and chamfered by barrel processing. As shown in FIGS. 2 and 3, the tip corners of the elastic legs 10 that come into contact with the rotating polygonal mirror 6 are subjected to a barrel treatment so that a smooth chamfered portion 12 is applied, and burrs and burrs are also removed.

従って、板ばね７が回転多面鏡６を押圧する際、弾性脚１０が回転多面鏡６の上面に弾接して外側に広がってもカジリ等が生じることがない。   Therefore, when the leaf spring 7 presses the rotary polygon mirror 6, even if the elastic legs 10 elastically contact the upper surface of the rotary polygon mirror 6 and spread outward, no galling or the like occurs.

以上から、板ばね７の押圧力が図４斜線部分で示すように回転多面鏡６全体に均一に加わり、回転軸４に対する回転多面鏡鏡６の傾きを低減することができる。   From the above, the pressing force of the leaf spring 7 is uniformly applied to the entire rotating polygon mirror 6 as shown by the hatched portion in FIG. 4, and the inclination of the rotating polygon mirror 6 with respect to the rotating shaft 4 can be reduced.

因みに、弾性脚１０にバレル処理で面取り部１２を施した場合と、角部が存在する場合との、それぞれの回転多面鏡の面倒れ及び回転変動ジッタ―の特性比較を図５に示しているが、本実施の形態のものでは面倒れ及び回転変動ジッタ―を大幅に改善できる。また弾性脚１０のカジリによる回転多面鏡６の損傷がなく良好なバランスを維持できる。   Incidentally, FIG. 5 shows a comparison of characteristics of the surface tilt and rotational fluctuation jitter of each rotary polygon mirror when the chamfered portion 12 is applied to the elastic leg 10 by barrel processing and when the corner portion is present. However, in the present embodiment, it is possible to significantly improve the troublesome tilt and the rotational fluctuation jitter. Moreover, there is no damage of the rotary polygonal mirror 6 due to galling of the elastic legs 10, and a good balance can be maintained.

なお、回転多面鏡６と支持部４とを多角形状等の非円形嵌合部で嵌合させておけば上記回転多面鏡６の空回りを防止できる。また、支持部４は本実施形態のように別途設けてもよいし、ロータ３のフレーム等をそのまま活用することも考えられる。   In addition, if the rotary polygon mirror 6 and the support part 4 are fitted by a non-circular fitting part such as a polygonal shape, the idle rotation of the rotary polygon mirror 6 can be prevented. Further, the support portion 4 may be provided separately as in the present embodiment, or the frame of the rotor 3 may be used as it is.

図６は本実施例の回転多面鏡駆動装置１３を画像形成部に搭載したレーザプリンタ１４を示し、先にも述べたように回転多面鏡６の面倒れ及び回転変動ジッタ―が大幅に向上できるところから、高精度な印字精度を実現できる。   FIG. 6 shows a laser printer 14 in which the rotary polygon mirror driving device 13 of this embodiment is mounted in an image forming unit, and as described above, the surface tilt and rotation fluctuation jitter of the rotary polygon mirror 6 can be greatly improved. Therefore, high-precision printing accuracy can be realized.

さらに、本実施例の回転多面鏡駆動装置１３を画像形成部に搭載した複写機とすることによって、同様に高精度な複写精度を実現できる。   Further, by using the rotary polygon mirror driving device 13 of the present embodiment as a copying machine in which the image forming unit is mounted, similarly high copying accuracy can be realized.

本発明にかかる回転多面鏡駆動装置は、板ばねの押圧力が回転多面鏡全体に均一に加わり、回転多面鏡の傾きを低減させるもので、プリンタ或いは複写機への利用が可能である。   The rotating polygon mirror driving device according to the present invention applies the pressing force of the leaf spring uniformly to the entire rotating polygon mirror to reduce the inclination of the rotating polygon mirror, and can be used for a printer or a copying machine.

本発明の実施例１における回転多面鏡駆動装置の断面図Sectional drawing of the rotary polygon mirror drive apparatus in Example 1 of this invention 同板ばねの要部拡大側断面図An enlarged side sectional view of the main part of the leaf spring 同板ばねの要部拡大正断面図Main section enlarged front sectional view of the leaf spring 同板ばねの押圧力分布図Pressure distribution diagram of the leaf spring 同回転多面鏡駆動装置の特性比較図Comparison of characteristics of the rotating polygon mirror drive unit 同回転多面鏡駆動装置を画像形成部に搭載したレーザプリンタの概略構成図Schematic configuration diagram of a laser printer equipped with the rotary polygon mirror drive device in the image forming unit 従来の回転多面鏡駆動装置の分解斜視図An exploded perspective view of a conventional rotary polygon mirror drive device 同板ばねの要部拡大側断面図An enlarged side sectional view of the main part of the leaf spring 同板ばねの要部拡大正断面図Main section enlarged front sectional view of the leaf spring 同板ばねの押圧力分布図Pressure distribution diagram of the leaf spring

符号の説明Explanation of symbols

１ モータ
３ ロータ
４ 支持部
５ 回転軸
６ 回転多面鏡
７ 板ばね
１０ 弾性脚
１２ 面取り部
１３ 回転多面鏡駆動装置
１４ レーザプリンタ
DESCRIPTION OF SYMBOLS 1 Motor 3 Rotor 4 Support part 5 Rotating shaft 6 Rotating polygon mirror 7 Leaf spring 10 Elastic leg 12 Chamfering part 13 Rotating polygon mirror drive device 14 Laser printer

Claims (4)

モータのロータと連係して回転する支持部に、金属製板ばね材をプレス加工により形成した板ばねの弾性力を介して回転多面鏡を押圧保持し、前記支持部はロータと一体的に構成され、中心部がモータの軸に係止された前記板ばねには回転多面鏡に弾接する複数の放射状弾性脚を形成し、前記板ばねの弾性脚の回転多面鏡と接する部位は、回転多面鏡を押圧し固定する際、前記弾性脚部が回転多面鏡面を円滑に径方向外側へ摺動するように面取りを形成した回転多面鏡駆動装置。 The rotating polygon mirror is pressed and held by the elastic force of the leaf spring formed by pressing a metal leaf spring material on the supporting portion that rotates in conjunction with the rotor of the motor, and the supporting portion is configured integrally with the rotor. A plurality of radial elastic legs elastically contacting the rotary polygon mirror are formed on the leaf spring whose central portion is locked to the shaft of the motor, and the portion of the elastic leg of the leaf spring contacting the rotary polygon mirror is a rotary polygon A rotating polygon mirror driving device in which chamfering is formed so that the elastic leg portion smoothly slides radially outward on the rotating polygon mirror surface when pressing and fixing the mirror. 面取りはバレル処理により行った請求項１記載の回転多面鏡駆動装置。 2. The rotary polygon mirror driving device according to claim 1, wherein the chamfering is performed by barrel processing. 請求項１〜２のいずれか１項記載の回転多面鏡駆動装置を画像形成部に搭載したレーザプリンタ。 Laser printer mounted to the image forming unit the rotary polygon mirror drive device according to any one of claims 1-2. 請求項１〜２のいずれか１項に記載の回転多面鏡駆動装置を画像形成部に搭載した複写機。 Copier mounted to the image forming unit a rotary polygon mirror driving apparatus according to any one of claims 1-2.
JP2004359431A 2004-12-13 2004-12-13 Rotating polygon mirror drive Expired - Fee Related JP4396503B2 (en)

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JP4396503B2 true JP4396503B2 (en) 2010-01-13

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