JPH03134612A - Light deflecting device - Google Patents

Light deflecting device

Info

Publication number
JPH03134612A
JPH03134612A JP27309889A JP27309889A JPH03134612A JP H03134612 A JPH03134612 A JP H03134612A JP 27309889 A JP27309889 A JP 27309889A JP 27309889 A JP27309889 A JP 27309889A JP H03134612 A JPH03134612 A JP H03134612A
Authority
JP
Japan
Prior art keywords
polygon mirror
rotating polygon
polygonal mirror
light beam
members
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
Application number
JP27309889A
Other languages
Japanese (ja)
Inventor
Toshitaka Agano
俊孝 阿賀野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP27309889A priority Critical patent/JPH03134612A/en
Publication of JPH03134612A publication Critical patent/JPH03134612A/en
Pending legal-status Critical Current

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  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To prevent refraction and distortion of a light beam due to disturbance of an air current by arranging air current straightening members rotating together with a rotating polygonal mirror above and/or under the rotating polygonal mirror. CONSTITUTION:A light deflecting device 10 is provided with a rotating polygonal mirror 12 which reflects and deflects a light beam 11 and air current straightening members 13 and 14 which are arranged above and under the polygonal mirror 12. In this device 10, the polygonal mirror 12 is rotated by a motor 15 and members 13 and 14 are rotated simultaneously with the polygonal mirror 12. Certain air currents are caused around the polygonal mirror 12 and members 13 and 14 by this rotation. Especially, the air current caused in a space 16 surrounded with a reflection face 12a of the polygonal mirror 12 and members 13 and 14 stably flows and is scarcely disturbed. This space 16 corresponds to the optical path. Consequently, refraction and distortion of the light beam do not occur around the polygonal mirror 12.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は光偏向装置に関し、特に回転多面鏡の回転によ
って該回転多面鏡の周囲に生起される空気流が乱される
ことなく、一定の空気流となるため、回転多面鏡に入射
または射出される光ビームが該空気流の乱れによって屈
折されたり、歪むことがない光偏向装置に関する。
DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an optical deflection device, and in particular to a light deflection device, in which the airflow generated around the rotating polygon mirror by rotation of the rotating polygon mirror is not disturbed and is constant. The present invention relates to an optical deflection device in which a light beam incident on or emitted from a rotating polygon mirror is not refracted or distorted due to turbulence in the air flow.

〈従来の技術〉 従来、画像情報が記録された記録媒体から画像情報を読
み取ったり、画像情報を写真感光材料等の記録媒体に記
録するために、これらの記録媒体に光ビームを二次元的
に走査する光ビーム走査装置が用いられている。 この
光ビーム走査装置において、レーザ発振器などの光源か
ら放射された光ビームを、高速で反射偏向させて走査す
る光偏向装置として回転多面鏡を用いたものがある。
<Prior art> Conventionally, in order to read image information from a recording medium on which image information is recorded or to record image information on a recording medium such as a photographic light-sensitive material, a light beam is directed two-dimensionally onto these recording media. A scanning light beam scanning device is used. Some of these light beam scanning devices use a rotating polygon mirror as a light deflection device that scans by reflecting and deflecting a light beam emitted from a light source such as a laser oscillator at high speed.

この回転多面鏡は、光ビームを高速で走査させるために
、高速度(例えば最大20,000r、p。
This rotating polygon mirror is used at high speeds (eg, up to 20,000 r, p) in order to scan the light beam at high speed.

m、)で回転される。 この回転多面鏡の高速回転によ
り、周囲に空気流が生起されるが、この空気流が乱され
ると、空気の疎密部が形成されることがある。 空気の
疎密部が、回転多面鏡に入射する光ビームあるいは回転
多面鏡から出射される光ビームの光路に形成されると、
前記疎密部がレンズ等の光学素子として働き、光ビーム
が屈折されるため、光ビームのビームスポットの径が変
動したり、光ビームが歪み記録媒体上の光ビームの照射
位置がずれてしまうことがあった。 このように光ビー
ムのビームスポットの径が変動したり、光ビームが歪ん
だりすると、ピント位置が狂い、光ビームが記録媒体上
に正確に焦点を結ばなくなり、得られる画像の解像度が
低下する原因となる。
m, ). The high-speed rotation of this rotating polygon mirror generates an air flow around it, but if this air flow is disturbed, air gaps may be formed. When air density areas are formed in the optical path of the light beam incident on the rotating polygon mirror or the light beam emitted from the rotating polygon mirror,
The above-mentioned sparse and dense portions act as optical elements such as lenses and refract the light beam, so the diameter of the beam spot of the light beam changes, the light beam becomes distorted, and the irradiation position of the light beam on the recording medium shifts. was there. If the beam spot diameter of the light beam changes or the light beam is distorted in this way, the focus position will be distorted, the light beam will no longer be accurately focused on the recording medium, and the resolution of the resulting image will decrease. becomes.

従来、回転多面鏡の高速回転によって、生起される空気
流が乱されるのを防止するために、例えば光ビームの入
射用スリットを有する包囲体で回転多面鏡の一部または
全部を包囲してなる装置(実開昭55−157214号
)、あるいは光ビームの入射口および出射口をそれぞれ
レンズで封じた密閉構造とし、内部を排気するようにし
た装置(特開昭58−220117号)が提案されてい
る。
Conventionally, in order to prevent the airflow caused by the high speed rotation of the rotating polygon mirror from being disturbed, a part or all of the rotating polygon mirror is surrounded by an enclosure having a slit for the incidence of the light beam, for example. (Japanese Patent Application Laid-Open No. 58-157214), or a device with a sealed structure in which the entrance and exit ports of the light beam are each sealed with lenses, and the inside is evacuated (Japanese Patent Application Laid-open No. 58-220117) was proposed. has been done.

〈発明が解決しようとする課題〉 しかしながら、前記実開昭55−157214号に記載
の装置では、回転多面鏡の高速回転によって生起される
空気流が入射スリット付近で乱され、空気の疎密部が形
成され、光ビームの屈折や偏向などの原因となる。 ま
た、前記従来の装置は、装置を密閉構造とするために、
装置の構成が複雑となり、また種々の部材を必要とする
ためコスト上昇の原因となる問題があった。
<Problems to be Solved by the Invention> However, in the device described in Utility Model Application No. 55-157214, the airflow generated by the high-speed rotation of the rotating polygon mirror is disturbed near the entrance slit, and the air is divided into dense and dense areas. This causes the refraction and deflection of the light beam. In addition, in the conventional device, in order to make the device a sealed structure,
The structure of the device is complicated and various parts are required, which causes a problem of increased costs.

そこで本発明の目的は、回転多面鏡の回転によって該多
面体鏡の周囲に生起される空気流が乱されることがなく
、簡単な構造であるため低コストで実現できる光偏向装
置を提供することにある。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical deflection device that does not disturb the air flow generated around the polygon mirror due to the rotation of the polygon mirror and can be realized at low cost due to its simple structure. It is in.

く課題を解決するための手段〉 本発明は前記課題を解決するために、回転多面鏡の上部
および/または下部に、該回転多面鏡とともに回転する
空気整流部材を配設してなることを特徴とする光偏向装
置を提供するものである。
Means for Solving the Problems> In order to solve the above problems, the present invention is characterized in that an air rectifying member that rotates together with the rotating polygon mirror is disposed above and/or below the rotating polygon mirror. The present invention provides an optical deflection device.

また、前記空気整流部材は、回転多面鏡の回転軸と同軸
に設けられた、該回転多面鏡の上面または下面をなす多
角形の外接半径よりも大きな半径を有する円板状のもの
であるのが好ましい。
Further, the air rectifying member is a disc-shaped member that is provided coaxially with the rotation axis of the rotating polygon mirror and has a radius larger than the circumscribed radius of a polygon forming the upper or lower surface of the rotating polygon mirror. is preferred.

さらにまた、回転多面鏡の上部と下部に配設される前記
空気整流部材が、回転多面鏡の回転軸と同軸に設けられ
、該回転多面鏡の上面をなす多角形の外接半径よりも大
きな半径を有する笠状のものと、該回転多面鏡の下面を
なす多角形の外接半径よりも大きな半径を有する笠状の
ものであるのが好ましい。
Furthermore, the air rectifying members disposed at the upper and lower parts of the rotating polygon mirror are provided coaxially with the rotation axis of the rotating polygon mirror, and have a radius larger than a circumscribed radius of a polygon forming an upper surface of the rotating polygon mirror. It is preferable that the polygon has a radius larger than the circumscribed radius of the polygon forming the lower surface of the rotating polygon mirror.

また、前記空気整流部材は、回転多面鏡と一体に形成さ
れたものであるのが好ましい。
Further, it is preferable that the air rectifying member is formed integrally with a rotating polygon mirror.

〈発明の作用〉 このような構造を有する本発明の光偏向装置においては
、回転多面鏡の上部および/または下部に配設した空気
整流部材は、回転多面鏡と同時に回転し、回転多面鏡お
よび空気整流部材の周囲に一定の空気流を生起し、特に
、回転多面鏡と空気整流部材とに囲まれた空間において
、生起される空気流が一定の流れとなり、乱されること
がない、 そのため、回転多面鏡の周囲において、空気
流の乱れによる光ビームの屈折や歪みが生じることがな
い。
<Operation of the Invention> In the optical deflection device of the present invention having such a structure, the air rectifying member disposed above and/or below the rotating polygon mirror rotates simultaneously with the rotating polygon mirror, and A constant air flow is generated around the air rectifying member, and especially in a space surrounded by the rotating polygon mirror and the air rectifying member, the air flow generated is a constant flow and is not disturbed. , there is no refraction or distortion of the light beam due to air flow turbulence around the rotating polygon mirror.

〈実施態様〉 以下、本発明の光偏向装置を、添付図面に示す本発明の
一実施例により詳細に説明する。
<Embodiment> Hereinafter, the optical deflection device of the present invention will be explained in detail with reference to an embodiment of the present invention shown in the accompanying drawings.

第1図は、本発明に係る光偏向装置の一実施例を示す斜
視図である。
FIG. 1 is a perspective view showing an embodiment of a light deflection device according to the present invention.

同図において、光偏向装置10は、光源(図示せず)か
ら所定の光学系を通って入射される光ビーム11を反射
偏向する回転多面鏡12と、該回転多面鏡12の上部お
よび下部に配設された空気整流部材13および14とを
有している。
In the figure, an optical deflection device 10 includes a rotating polygon mirror 12 that reflects and deflects a light beam 11 that is incident from a light source (not shown) through a predetermined optical system, and a rotating polygon mirror 12 that reflects and deflects a light beam 11 that is incident from a light source (not shown) through a predetermined optical system. It has air rectifying members 13 and 14 arranged therein.

回転多面鏡12は、光ビーム11を反射偏向するための
平坦な反射面12aを複数有し、モータ15によって一
定速度で回転されるものである。
The rotating polygon mirror 12 has a plurality of flat reflecting surfaces 12a for reflecting and deflecting the light beam 11, and is rotated by a motor 15 at a constant speed.

空気整流部材13および14は、回転多面鏡12の回転
軸と同軸に設けられ、該回転多面鏡12の上面または下
面をなす多角形の外接半径よりも大台な半径の円形断面
を有する円板状のものであり、その外周端131および
141が回転多面[12の外周縁よりも外側にはみ出す
ように構成されている。
The air rectifying members 13 and 14 are disks that are provided coaxially with the rotation axis of the rotating polygon mirror 12 and have a circular cross section with a radius larger than the circumscribed radius of the polygon forming the upper or lower surface of the rotating polygon mirror 12. The outer circumferential ends 131 and 141 are configured to protrude outward from the outer circumferential edge of the rotating polygon [12].

以上の構成を有する光偏向装置10においては、回転多
面鏡12がモータ15によって回転するとともに、空気
整流部材13および14も同時に回転する。 この回転
によって、回転多面鏡12並びに空気整流部材13およ
び14の周囲に一定の空気流が生起される。 こ の 
と籾、特に、回転多面鏡12の反射面12aと空気整流
部材13および14に囲まれた空間6において生起され
る空気流は、一定の流れとなり、乱されることが少い、
 この空間6は光ビームが入射および射出される光路に
あたる。
In the optical deflection device 10 having the above configuration, the rotating polygon mirror 12 is rotated by the motor 15, and the air rectifying members 13 and 14 are also rotated at the same time. This rotation generates a constant air flow around the rotating polygon mirror 12 and the air rectifying members 13 and 14. this
The air flow generated in the space 6 surrounded by the reflecting surface 12a of the rotating polygon mirror 12 and the air rectifying members 13 and 14 is a constant flow and is hardly disturbed.
This space 6 corresponds to an optical path through which a light beam enters and exits.

したがって、回転多面鏡の周囲において光ビームの屈折
や歪みが生じることがない。
Therefore, no refraction or distortion of the light beam occurs around the rotating polygon mirror.

なお、本実施例において、用いられる回転多面鏡として
、相隣る反射面の交線である稜を、一部または全部にわ
たって切除し反射面の角部分を面取りしてなる回転多面
鏡を用いれば、空気流が乱れるのをさらに抑制すること
ができ、しかも回転多面鏡の回転に対する空気抵抗を減
少させることがでミる点で、好ましい。
In this embodiment, as the rotating polygon mirror used, a rotating polygon mirror formed by partially or completely cutting off the ridges, which are the intersection lines of adjacent reflecting surfaces, and chamfering the corners of the reflecting surfaces, is used. This is preferable because it can further suppress airflow turbulence and reduce air resistance to rotation of the rotating polygon mirror.

また、第2a図は本発明の光偏向装置の他の実施例を示
す斜視図であり、第2b図はその1−1断面図である。
Moreover, FIG. 2a is a perspective view showing another embodiment of the optical deflection device of the present invention, and FIG. 2b is a 1-1 sectional view thereof.

 なお、以下の説明および図において、第1図に示す光
偏向装置と同一の構成要素には、同一の符号を付した。
In the following description and figures, the same components as those of the optical deflection device shown in FIG. 1 are given the same reference numerals.

同図に示す、光偏向装置18は、光源(図示せず)から
所定の光学系を通って入射される光ビーム11を反射偏
向する回転多面鏡12と、該回転多面鏡12の上部およ
び下部に配設されたそれぞれ笠状の空気整流部材19お
よび20とを有している。
The optical deflection device 18 shown in the figure includes a rotating polygon mirror 12 that reflects and deflects a light beam 11 incident from a light source (not shown) through a predetermined optical system, and an upper and lower part of the rotating polygon mirror 12. They have shade-shaped air rectifying members 19 and 20, respectively, which are disposed in the air.

この光偏向装置18における空気整流部材19および2
0は、それぞれ回転多面鏡12の上部および下部に回転
多面鏡12の回転軸と同軸に設けられている。 空気整
流部材19は、該回転多面鏡12の上面をなす多角形の
外接半径よりも大きな半径を有する笠状のものであり、
回転多面tj112の反射面12aの角部分が面取りさ
れて回転多面鏡12が覆いかぶせられている。 また、
空気整流部材20も、同様に回転多面鏡12の下面をな
す多角形の外接円よりも大きな半径を有する笠状のもの
であり、反射面12aの角部分が面取りされている回転
多面鏡12に覆いかぶせられている。 これらの空気整
流部材19および20の外周端191および201は、
回転多面11112の外周縁よりも外側にはみ出し、回
転多面鏡12を覆うように構成されている。
Air rectifying members 19 and 2 in this optical deflection device 18
0 are provided coaxially with the rotation axis of the rotating polygon mirror 12 at the upper and lower parts of the rotating polygon mirror 12, respectively. The air rectifying member 19 is a cap-shaped member having a radius larger than the circumscribed radius of the polygon forming the upper surface of the rotating polygon mirror 12,
The corner portion of the reflective surface 12a of the rotating polygon tj112 is chamfered and the rotating polygon mirror 12 is covered with it. Also,
Similarly, the air rectifying member 20 is shaped like a cap and has a radius larger than the circumscribed circle of the polygon forming the lower surface of the rotating polygon mirror 12, and is similar to the rotating polygon mirror 12 where the corner portions of the reflective surface 12a are chamfered. covered. The outer peripheral ends 191 and 201 of these air rectifying members 19 and 20 are
It is configured to protrude outside the outer peripheral edge of the rotating polygon 11112 and cover the rotating polygon mirror 12.

この光偏向装置18においても、第1図に示した光偏向
装置10と同一の作用をなすことができる。
This optical deflection device 18 can also perform the same function as the optical deflection device 10 shown in FIG.

以上の第1図および第2図に示す光偏向装置において、
空気整流部材と回転多面鏡とを、例えば第1図に示すよ
うに回転多面鏡12の反射面12aの高さと、空気整流
部材19の下面のオーバーハング長さと、空気整流部材
2oの上面のオーバーハング長さとが同一となるように
構成すると、空気流が乱れるのを十分に抑制し、モータ
の消費電力を少くすることができる点で好ましい、 ま
た、第2図の光偏向装置においても同様である。
In the optical deflection device shown in FIGS. 1 and 2 above,
The air rectifying member and the rotating polygon mirror are determined by, for example, the height of the reflecting surface 12a of the rotating polygon mirror 12, the overhang length of the lower surface of the air rectifying member 19, and the overhang of the upper surface of the air rectifying member 2o, as shown in FIG. It is preferable to configure the hang lengths to be the same because it can sufficiently suppress airflow turbulence and reduce the power consumption of the motor. be.

本発明の光偏向装置は、第1図および第2図に示したよ
うに構成されるが、本発明はこれらに限定されるもので
はない。
Although the optical deflection device of the present invention is configured as shown in FIGS. 1 and 2, the present invention is not limited thereto.

例えば、第1図および第2図に示した光偏向装置は、空
気整流部材が、回転多面鏡の上部および下部の両方に配
設されたものであるが、上部または下部のいずれか一方
のみに配設されたものでもよい。
For example, in the optical deflection device shown in FIGS. 1 and 2, the air rectifying member is disposed on both the upper and lower parts of the rotating polygon mirror, but the air rectifying member is disposed only on either the upper or lower part. It may be arranged.

また、空気整流部材と回転多面鏡とを一体に形成すれば
軽量にすることができ、また取付性が向上するので好ま
しい。
Furthermore, it is preferable to form the air rectifying member and the rotating polygon mirror in one piece, since this makes it possible to reduce the weight and improve the ease of installation.

〈発明の効果〉 本発明の光偏向装置は、回転多面鏡の回転によって生起
される空気流が乱されることなく、光ビームの屈折や歪
みなどの問題が生じない。
<Effects of the Invention> In the optical deflection device of the present invention, the airflow caused by the rotation of the rotating polygon mirror is not disturbed, and problems such as refraction and distortion of the light beam do not occur.

また、簡単な構造であるため、コスト的に有利である。Moreover, since it has a simple structure, it is advantageous in terms of cost.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の光偏向装置の実施例を示す斜視図、
第2a図は、本発明の別の実施例を示す斜視図、第2b
図は、そのI−I断面図である。 符号の説明 10.18・・・光偏向装置、 11・・・光ビーム、 12・・・回転多面鏡、 13.14.19.20・・・空気整流部材、15・・
・モータ FIG、1 FIG、2a
FIG. 1 is a perspective view showing an embodiment of the optical deflection device of the present invention;
Figure 2a is a perspective view showing another embodiment of the invention; Figure 2b is a perspective view of another embodiment of the invention;
The figure is a sectional view taken along line II. Explanation of symbols 10.18... Light deflection device, 11... Light beam, 12... Rotating polygon mirror, 13.14.19.20... Air rectifying member, 15...
・Motor FIG, 1 FIG, 2a

Claims (1)

【特許請求の範囲】[Claims] 回転多面鏡の上部および/または下部に、該回転多面鏡
とともに回転する空気整流部材を配設してなることを特
徴とする光偏向装置。
An optical deflection device characterized in that an air rectifying member that rotates together with the rotating polygon mirror is disposed above and/or below the rotating polygon mirror.
JP27309889A 1989-10-20 1989-10-20 Light deflecting device Pending JPH03134612A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27309889A JPH03134612A (en) 1989-10-20 1989-10-20 Light deflecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27309889A JPH03134612A (en) 1989-10-20 1989-10-20 Light deflecting device

Publications (1)

Publication Number Publication Date
JPH03134612A true JPH03134612A (en) 1991-06-07

Family

ID=17523112

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27309889A Pending JPH03134612A (en) 1989-10-20 1989-10-20 Light deflecting device

Country Status (1)

Country Link
JP (1) JPH03134612A (en)

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