JPS62184431A - Light beam scanner - Google Patents
Light beam scannerInfo
- Publication number
- JPS62184431A JPS62184431A JP61027349A JP2734986A JPS62184431A JP S62184431 A JPS62184431 A JP S62184431A JP 61027349 A JP61027349 A JP 61027349A JP 2734986 A JP2734986 A JP 2734986A JP S62184431 A JPS62184431 A JP S62184431A
- Authority
- JP
- Japan
- Prior art keywords
- light beam
- scanning
- curvature
- concave mirror
- mirror
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000011514 reflex Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の分野）
本発明は光ビームを偏向して走査面上を走査さぜる光ビ
ーム走査９ｉｅｔに関するものであり、特に１細には装
置の小型化および低コスト化を図ることのできる光ビー
ム走査装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a light beam scanning device that deflects a light beam to scan a scanning surface. The present invention relates to a light beam scanning device that can be used in various ways.
（発明の技術的背景および先行技術）
従来より、ガルバノメータミラー、回転多面鏡等の反射
型光偏向器によって光ビームを偏向し、走査面上を２次
元的に走査せしめる光ビーム走査装置が、各種走査記録
装置、走査記録装置等にｃ１３いて広く用いられている
。(Technical Background and Prior Art of the Invention) Conventionally, there have been various types of light beam scanning devices that deflect a light beam using a reflective optical deflector such as a galvanometer mirror or a rotating polygon mirror to scan a scanning surface two-dimensionally. C13 is widely used in scanning recording devices, scanning recording devices, etc.
上記光ビーム走査装置は、その用途の多様化に伴ない、
できるだけ装置内の光学素子の点数を減らして装置仝休
の小型化、低コスト化を図るといった要請がなされるこ
とが多い。しかしながら、従来の装置においては、光ビ
ームを反射−向りる反射型光偏向器とともに、反射型光
偏向器と走査面の間に段【プられた走査レンズが必要で
あり、この走査レンズのために上記要請に十分に応えら
れないという問題があった。With the diversification of the uses of the above-mentioned light beam scanning device,
There are often demands to reduce the number of optical elements in a device as much as possible to reduce the size and cost of the device. However, conventional devices require a reflective optical deflector that reflects and directs the light beam, as well as a scanning lens that is stepped between the reflective optical deflector and the scanning surface. Therefore, there was a problem that the above request could not be fully met.
りなわら上記走査レンズは光偏向器により反射−向され
た光ビームを走査面上で集束させるものであり、また走
査面が光ビームの偏向方向において平ｊｆｌである場合
には、走査レンズとして光偏向器ににり等角速度で偏向
される光ビームを上記走査面上において集束させるとと
もに等速で走査させるｒθレンズが用いられる。これら
の走査レンズは偏向された光ビームを漏れなく入射さす
る必要があるため大型のものになり易く、また大型であ
りかつ高精度なレンズは高価であることから、この走査
レンズが設けられていることにより、装置の小型化およ
び低コスト化が思うように図れないという不都合がある
。The above-mentioned scanning lens focuses the light beam reflected and directed by the optical deflector on the scanning surface, and when the scanning surface is flat in the direction of deflection of the light beam, the scanning lens functions as a An rθ lens is used that focuses a light beam deflected by a deflector at a constant angular velocity on the scanning plane and scans it at a constant velocity. These scanning lenses tend to be large because they must allow the deflected light beam to enter without omission, and large, high-precision lenses are expensive, so these scanning lenses are installed. This has the disadvantage that it is not possible to reduce the size and cost of the device as desired.
（発明の目的）
本発明は上記のような問題点に鑑みてなされたものであ
り、走査レンズを排し、装置の小型化および低コスト化
を効果的に図ることのできる光ビーム走査装置を掟供す
ることを目的とするものである。(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and provides a light beam scanning device that eliminates the scanning lens and can effectively reduce the size and cost of the device. The purpose is to provide an offering.
（発明の構成）
本発明の光ビーム走査装置は、光ビームを反射偏向する
反射型光偏向器のすべての反射面が、同一の曲面をイ８
′？Ｉる凹面鏡であることを特徴とするものである。(Structure of the Invention) In the light beam scanning device of the present invention, all the reflective surfaces of the reflective optical deflector that reflect and deflect the light beam have the same curved surface.
′? It is characterized by being a concave mirror.
ずなわら、本発明の装置によれば、光偏向器の反射面が
凹面鏡であることにより、この反射面は光ビームを反射
偏向するとともに光ビームを偏向後の光路上において集
束せしめることができるので、従来光ビームを集束させ
るために設けられていた走査レンズは不要となる。従っ
て装置全体がコンパクトになるとともにその製造コスト
を低減させることができる。According to the device of the present invention, since the reflecting surface of the optical deflector is a concave mirror, this reflecting surface can reflect and deflect the light beam and also focus the light beam on the optical path after the deflection. Therefore, the scanning lens conventionally provided to focus the light beam becomes unnecessary. Therefore, the entire device can be made compact and its manufacturing cost can be reduced.
（実ＩＩＭｒＥ、様）
以下、図面を参照して本発明の実施態様について説明す
る。(Mr. IIMrE) Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１Ａ図および第１Ｂ図はそれぞれ本発明の一実施態様
による光ビーム走査装置の概要を示す平面図おにび側面
図である。1A and 1B are a plan view and a side view, respectively, showing the outline of a light beam scanning device according to an embodiment of the present invention.
ビーム光源１から発せられた光ビーム２は矢印へ方向に
回転する回転多面鏡３に入射して矢印Ｂ方向に反射偏向
され、走査面４上を主走査する。A light beam 2 emitted from a beam source 1 enters a rotating polygon mirror 3 rotating in the direction of the arrow, is reflected and deflected in the direction of the arrow B, and main-scans a scanning surface 4.
走査面４は矢印Ｃ方向に搬送されて副走査が行なわれる
ので、光ビーム２は走査面４上を２次元的に走査する。Since the scanning surface 4 is conveyed in the direction of arrow C and sub-scanning is performed, the light beam 2 scans the scanning surface 4 two-dimensionally.
前記光ビーム２の、回転多面鏡３に入射する前のビーム
形状は一例として略正円となっており・、回転多面鏡の
各反射面３ａは互いに同一の曲面を有する凹面鏡となっ
ている。また各凹面鏡の曲率は主走査方向と副走査方向
において互いに等しくなっている。このような反射面３
ａに入射して反射偏向されることにより、光ビーム２は
走査面４上を主走査せしめられるとともにその光路にお
いて徐々に集束せしめられる。上述のように光ビーム２
はビーム形状が正円であり、反射面３ａを形成する凹面
鏡の曲率は主走査方向と副走査方向で等しくなっている
ことから、光ビーム２は主走査方向および副走査方向共
に同じ位置で集束し、各主走査毎の光ビーム２の集束位
置は円弧状となる。従って走査面４を、図示のように光
ビームの集束位置の軌跡によって形成される円筒面上に
位置させれば、集束した光ビーム２により、走査面４上
を２次元的に走査することができる。従って木実ｍ態様
の装置によれば従来の走査レンズを用いることなく光ビ
ームによる走査を行なうことができる。The beam shape of the light beam 2 before entering the rotating polygon mirror 3 is, for example, a substantially perfect circle, and each reflecting surface 3a of the rotating polygon mirror is a concave mirror having the same curved surface. Further, the curvature of each concave mirror is equal to each other in the main scanning direction and the sub-scanning direction. Such a reflective surface 3
By being reflected and deflected by the light beam 2, the light beam 2 is caused to perform main scanning on the scanning surface 4, and is gradually focused in its optical path. Light beam 2 as described above
Since the beam shape is a perfect circle and the curvature of the concave mirror forming the reflecting surface 3a is equal in the main scanning direction and the sub-scanning direction, the light beam 2 is focused at the same position in both the main scanning direction and the sub-scanning direction. However, the focusing position of the light beam 2 for each main scan is arcuate. Therefore, if the scanning surface 4 is located on a cylindrical surface formed by the locus of the focused position of the light beam as shown in the figure, the scanning surface 4 can be scanned two-dimensionally by the focused light beam 2. can. Therefore, according to the device of the tree m mode, scanning with a light beam can be performed without using a conventional scanning lens.
なＪ３、走査面上において光ビームのビーム形状を常に
均一にするために、各反射面が同一の曲面からなること
は必要不可欠であるが、回転多面鏡に入射する光ビーム
のビーム形状が南回であったり、走査面上においてビー
ム形状が南回の光ビームを得たい場合等も考えられるの
で、各反射面の主走査方向と副走査方向の曲率は必ずし
も等しいものである必要はない。また、各反射面の主走
査方向の曲面を南回状として反射面にｆθ性を持たせる
ようにずれば、走査面を平坦な状態にして移動させるこ
とも可能である。さらに反射型光偏向器としては上述し
た回転多面鏡の他にガルバノメータミラーを用いること
もできる。J3. In order to always make the beam shape of the light beam uniform on the scanning plane, it is essential that each reflecting surface be composed of the same curved surface, but if the beam shape of the light beam incident on the rotating polygon mirror is The curvatures of each reflecting surface in the main scanning direction and the sub-scanning direction do not necessarily have to be equal because it is possible to obtain a light beam with a southerly beam shape on the scanning surface. Further, by making the curved surface of each reflecting surface in the main scanning direction into a southern circuit shape and shifting the reflecting surface so that it has fθ characteristics, it is possible to move the scanning surface in a flat state. Further, as the reflective optical deflector, a galvanometer mirror can also be used in addition to the above-mentioned rotating polygon mirror.
（発明の効果）
以上説明したように、本発明の光ビーム走査装置によれ
ば、反射型光偏向器のすべての反射面を同一の凹面鏡と
したことにより、走査レンズを用いることなく光ビーム
を走査面上において集束させることができ、装置の小型
化、低コスト化を図ることかできる。(Effects of the Invention) As explained above, according to the light beam scanning device of the present invention, all the reflecting surfaces of the reflective optical deflector are made of the same concave mirror, so that the light beam can be scanned without using a scanning lens. It can be focused on the scanning plane, making it possible to reduce the size and cost of the device.
第１Ａ図は本発明の一実施態様による光ビーム走査装置
の概要を示す平面図、
第１Ｂ図は上記装置の側面図である。
２・・・光ビーム ３・・・回転多面鏡３ａ・・・
反射面 ４・・・走査面第１Ａ図
第旧図FIG. 1A is a plan view showing an outline of a light beam scanning device according to an embodiment of the present invention, and FIG. 1B is a side view of the device. 2... Light beam 3... Rotating polygon mirror 3a...
Reflective surface 4...Scanning surface Figure 1A Old figure
Claims (1)
を走査せしめる光ビーム走査装置において、前記反射型
光偏向器のすべての反射面が、互いに同一の曲面を有す
る凹面鏡であることを特徴とする光ビーム走査装置。A light beam scanning device in which a light beam is reflected and deflected by a reflective optical deflector to scan a scanning surface, characterized in that all reflective surfaces of the reflective optical deflector are concave mirrors having the same curved surface. A light beam scanning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027349A JPS62184431A (en) | 1986-02-10 | 1986-02-10 | Light beam scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027349A JPS62184431A (en) | 1986-02-10 | 1986-02-10 | Light beam scanner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62184431A true JPS62184431A (en) | 1987-08-12 |
Family
ID=12218561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61027349A Pending JPS62184431A (en) | 1986-02-10 | 1986-02-10 | Light beam scanner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62184431A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009121527A (en) * | 2007-11-12 | 2009-06-04 | Otics Corp | Hydraulic automatic tensioner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5831301A (en) * | 1981-08-20 | 1983-02-24 | Gensuke Kiyohara | Polygon mirror |
| JPS59216122A (en) * | 1983-05-24 | 1984-12-06 | Fuji Xerox Co Ltd | Light beam scanner |
-
1986
- 1986-02-10 JP JP61027349A patent/JPS62184431A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5831301A (en) * | 1981-08-20 | 1983-02-24 | Gensuke Kiyohara | Polygon mirror |
| JPS59216122A (en) * | 1983-05-24 | 1984-12-06 | Fuji Xerox Co Ltd | Light beam scanner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009121527A (en) * | 2007-11-12 | 2009-06-04 | Otics Corp | Hydraulic automatic tensioner |
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