JPH0430575Y2 - - Google Patents
Info
- Publication number
- JPH0430575Y2 JPH0430575Y2 JP1986019976U JP1997686U JPH0430575Y2 JP H0430575 Y2 JPH0430575 Y2 JP H0430575Y2 JP 1986019976 U JP1986019976 U JP 1986019976U JP 1997686 U JP1997686 U JP 1997686U JP H0430575 Y2 JPH0430575 Y2 JP H0430575Y2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- scanning
- prism
- optical system
- optical path
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 32
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 239000005357 flat glass Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Combination Of More Than One Step In Electrophotography (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、携帯可能な極めてコンパクトなプリ
ンタ又はポータブルワードプロセツサ等で用いる
レーザビーム走査光学系に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a laser beam scanning optical system used in a portable and extremely compact printer or a portable word processor.
一般の走査光学系は、レーザ光源等の光源より
の光ビームをポリゴンミラー等で反射させた後に
例えばｆ・θレンズにて走査面上に結像する。こ
こでポリゴンミラーを回転させることにより走査
面上を走査する。
In a general scanning optical system, a light beam from a light source such as a laser light source is reflected by a polygon mirror or the like, and then an image is formed on a scanning surface using, for example, an f/theta lens. Here, the scanning surface is scanned by rotating the polygon mirror.
この走査光学系は、数多くの光学素子を必要す
る上にｆ・θレンズは一定の長さの焦点距離を必
要とするため光源から走査面までの光路長が長
く、したがつてこのような走査光学系を備えた装
置は比較的大型にならざるを得ない。そのために
ポータブルワードプロセツサ等のコンパクトな装
置に走査光学系を配置することが困難であつた。 This scanning optical system requires a large number of optical elements, and the f/θ lens requires a fixed focal length, so the optical path length from the light source to the scanning plane is long. A device equipped with an optical system must be relatively large. Therefore, it has been difficult to arrange a scanning optical system in a compact device such as a portable word processor.
〔考案が解決しようとする問題点〕
本考案が解決しようとする問題点はポータブル
ワードプロセツサ等のようなコンパクトな装置の
限られたスペース内に配置し得るようなレーザビ
ーム走査光学系を得ることにある。[Problem to be solved by the invention] The problem to be solved by the invention is to obtain a laser beam scanning optical system that can be placed within a limited space of a compact device such as a portable word processor. There is a particular thing.
本考案は上記の問題点を解決するためにポリゴ
ンミラー等の偏向器から走査面までの光路を反射
面により副走査方向に折り曲げることによつて限
られたスペース内に光学系を配置し得るように構
成したもので、特に結像レンズ系（例えばｆ・θ
レンズ）内にても光路を折り曲げるようにした走
査光学系を提供するものである。
In order to solve the above-mentioned problems, the present invention bends the optical path from a deflector such as a polygon mirror to the scanning surface in the sub-scanning direction by a reflective surface, thereby making it possible to arrange the optical system within a limited space. In particular, the imaging lens system (for example, f/θ
The present invention provides a scanning optical system in which the optical path is bent even within the lens.
本考案の走査光学系は、更に結像レンズ系中で
の光路の折り曲げのために厚さの厚いレンズの一
部をプリズムとしその一面を反射面としたもので
ある。 In the scanning optical system of the present invention, in order to bend the optical path in the imaging lens system, a part of the thick lens is made into a prism, and one surface of the prism is made into a reflective surface.
次に本考案の一実施例を図面をもとに説明す
る。
Next, one embodiment of the present invention will be described based on the drawings.
第１図は本考案の実施例の構成を示す図で、１
はモータ２の駆動で回転させられるポリゴンミラ
ー、３は各レンズ４，５，６およびプリズム７に
より構成されているｆ・θレンズ、８，９は夫々
反射鏡、１０はその表面１１が走査面であるドラ
ムである。これらの光学素子からなる走査光学系
は、ポータブルワードプロセツサ等のコンパクト
な装置の本体20内に配置してある。 FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
1 is a polygon mirror rotated by the drive of a motor 2; 3 is an f/θ lens composed of lenses 4, 5, 6 and a prism 7; 8 and 9 are reflecting mirrors; 10 is a scanning surface whose surface 11 is a scanning surface; It is a drum. A scanning optical system made up of these optical elements is arranged within a main body 20 of a compact device such as a portable word processor.
以上のような本考案の実施例は、図示してない
光源よりのビームがポリゴンミラー２の符号Ａに
て示す部分に入射されここで反射され矢印Ｂの方
向へ進む。このビームは、ｆ・θレンズを通り
ｆ・θレンズ中に配置されたｆ・θプリズム７の
面7aにて反射されてその光路が折り曲げられ、
更に反射鏡８，９にて反射されて光路を折り曲げ
られた後ｆ・θレンズ３により走査面１１上に結
像される。ここでモータ２の駆動によつてポリゴ
ンミラー１を回転させれば、ビームは走査面１１
上を走査することになる。 In the embodiment of the present invention as described above, a beam from a light source (not shown) is incident on a portion of the polygon mirror 2 indicated by the symbol A, is reflected there, and travels in the direction of the arrow B. This beam passes through the f/theta lens and is reflected by the surface 7a of the f/theta prism 7 placed in the f/theta lens, and its optical path is bent.
Further, the light is reflected by the reflecting mirrors 8 and 9 and the optical path is bent, and then an image is formed on the scanning surface 11 by the f/θ lens 3. Here, if the polygon mirror 1 is rotated by driving the motor 2, the beam will be directed to the scanning surface 11.
You will have to scan above.
このようにｆ・θレンズ３中のｆ・θプリズム
７および反射鏡８，９により夫々光路が折り曲げ
られるのでｆ・θレンズの所定の焦点距離の光路
長を確保し得てドラム１０の走査面１１上にビー
ムを結像できしかも狭いスペース内に走査光学系
を配置することができる。特にｆ・θレンズ３中
にｆ・θプリズム７を設けることによつてｆ・θ
レンズの途中で光路を折り曲げるようにしたこと
により一層狭いスペース内に走査光学系を配置し
得た。 In this way, the optical path is bent by the f/theta prism 7 and the reflecting mirrors 8 and 9 in the f/theta lens 3, so that the optical path length corresponding to the predetermined focal length of the f/theta lens can be ensured, and the scanning surface of the drum 10 is The beam can be imaged onto 11 and the scanning optics can be placed within a narrow space. In particular, by providing the f/θ prism 7 in the f/θ lens 3, the f/θ
By bending the optical path in the middle of the lens, the scanning optical system could be placed in a narrower space.
ｆ・θプリズムの配置位置つまりｆ・θレンズ
内での光路の折り曲げ位置は図示する実施例のも
のに限ることなく、走査光学系を設ける装置本体
の形状、大きさ等に応じて適宜定めればよい。 The position of the f·θ prism, that is, the position where the optical path is bent within the f·θ lens, is not limited to that in the illustrated embodiment, but may be determined appropriately depending on the shape, size, etc. of the device body in which the scanning optical system is provided.
このｆ・θプリズムは、ｆ・θレンズの比較的
厚いレンズの一部を利用することによつて形成で
きるので、周知のｆ・θレンズそのものの利用又
はその僅かな設計変更によつて容易に形成でき
る。この実施例ではｆ・θレンズ中の厚いレンズ
を一方の面が平面であるレンズとこれに接合され
た平行平面ガラス板とにて構成し、この平行平面
ガラス板をプリズム状にすることによつてｆ・θ
プリズムにしてある。又厚いレンズを第３図のよ
うに中央に平行平面ガラス板Ｐを配置した３枚接
合レンズとし、平行平面ガラス板Ｐをプリズム状
にしてもよい。 This f/theta prism can be formed by using a part of a relatively thick f/theta lens, so it can be easily formed by using the well-known f/theta lens itself or by slightly changing its design. Can be formed. In this embodiment, the thick lens in the f/θ lens is composed of a lens whose one surface is flat and a parallel flat glass plate bonded to the lens, and this parallel flat glass plate is shaped into a prism. Tute f・θ
It is made into a prism. Alternatively, the thick lens may be a three-piece cemented lens with a parallel plane glass plate P arranged in the center as shown in FIG. 3, and the parallel plane glass plate P may be shaped like a prism.
第２図は本考案で用いられるｆ・θレンズの一
例を示す図で光源およびポリゴンミラーと合わせ
て記載してある。このｆ・θレンズのレンズL1，
L2，L3のうちレンズL3が平行平面ガラス板Ｐと
平凸レンズＬとを接合したレンズで、そのうちの
平行平面ガラス板Ｐをｆ・θプリズムとすればよ
い。 FIG. 2 is a diagram showing an example of an f/theta lens used in the present invention, together with a light source and a polygon mirror. The lens L 1 of this f・θ lens,
Among L 2 and L 3 , the lens L 3 is a lens made by cementing a parallel plane glass plate P and a plano-convex lens L, and the parallel plane glass plate P may be an f·θ prism.
尚実施例では偏向器としてポリゴンミラーを又
結像レンズ系としてｆ・θレンズを用いているが
これに限ることはない。例えば偏向器は定角速度
で振動するガルバノミラーや正弦振動するガルバ
ノミラー等でもよく、又結像レンズ系はアークサ
インレンズでもよい。 In the embodiment, a polygon mirror is used as a deflector and an f/θ lens is used as an imaging lens system, but the present invention is not limited to these. For example, the deflector may be a galvano mirror that vibrates at a constant angular velocity or a galvano mirror that vibrates sinusoidally, and the imaging lens system may be an arcsine lens.
本考案のレーザビーム走査光学系は、偏向器か
ら走査面までの間に複数の反射面を設けることに
より副走査方向に光路を折り曲げて狭いスペース
内に光学系を配置し得るようにした。そのため携
帯可能な極めてコンパクトなプリンタ又はポータ
ブルワードプロセツサ等のコンパクトにする必要
のある装置に本考案のレーザビーム走査光学系を
用いれば装置を極端に小型化し得る利点がある。
In the laser beam scanning optical system of the present invention, a plurality of reflective surfaces are provided between the deflector and the scanning surface, so that the optical path is bent in the sub-scanning direction so that the optical system can be placed in a narrow space. Therefore, if the laser beam scanning optical system of the present invention is used in a device that needs to be made compact, such as a portable extremely compact printer or a portable word processor, there is an advantage that the device can be made extremely compact.
第１図は本考案の一実施例を光学系を示す図、
第２図は上記実施例で用いるｆ・θレンズの一例
を示す図、第３図はｆ・θレンズ中の接合レンズ
の他の例の断面図である。
１……モータ、２……ポリゴンミラー、３……
ｆ・θレンズ、７……ｆ・θプリズム、８，９…
…反射鏡、１１……走査面。
FIG. 1 is a diagram showing an optical system of an embodiment of the present invention.
FIG. 2 is a diagram showing an example of the f/theta lens used in the above embodiment, and FIG. 3 is a sectional view of another example of the cemented lens in the f/theta lens. 1...Motor, 2...Polygon mirror, 3...
f/θ lens, 7... f/θ prism, 8, 9...
...Reflector, 11...Scanning surface.
Claims (1)
ンズにて走査面上に結像、走査する光学系であつ
て、fθレンズ系中の走査面に最も近いレンズを、
凸面を走査面に向けた平凸レンズとし、該平凸レ
ンズにプリズム形状の断面を有する三角柱を接合
し該プリズム面の一面を反射面とすることによつ
て、走査光路を副走査方向に折り曲げるようにし
たことを特徴とするレーザビーム走査光学系。 An optical system that deflects a light beam from a light source with a deflector and then images it on a scanning surface using an fθ lens and scans it.The lens closest to the scanning surface in the fθ lens system is
A plano-convex lens with a convex surface facing the scanning surface is used, a triangular prism having a prism-shaped cross section is bonded to the plano-convex lens, and one surface of the prism surface is used as a reflective surface, so that the scanning optical path is bent in the sub-scanning direction. A laser beam scanning optical system characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986019976U JPH0430575Y2 (en) | 1986-02-17 | 1986-02-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986019976U JPH0430575Y2 (en) | 1986-02-17 | 1986-02-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62132514U JPS62132514U (en) | 1987-08-21 |
| JPH0430575Y2 true JPH0430575Y2 (en) | 1992-07-23 |
Family
ID=30815060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986019976U Expired JPH0430575Y2 (en) | 1986-02-17 | 1986-02-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0430575Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5116938A (en) * | 1974-07-31 | 1976-02-10 | Matsushita Electric Ind Co Ltd |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119423U (en) * | 1983-01-31 | 1984-08-11 | 株式会社リコー | Laser writing optical system |
-
1986
- 1986-02-17 JP JP1986019976U patent/JPH0430575Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5116938A (en) * | 1974-07-31 | 1976-02-10 | Matsushita Electric Ind Co Ltd |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62132514U (en) | 1987-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR900002098A (en) | Optical scanning device and asymmetric aspherical scanning lens | |
| KR100335624B1 (en) | Laser beam scanning apparatus | |
| JPH0430575Y2 (en) | ||
| JPH08248345A (en) | Optical scanner | |
| JPH07209599A (en) | Optical scanning device and polygon mirror | |
| JP2583716B2 (en) | Optical system laser beam scanner | |
| JP2618889B2 (en) | Optical scanning device | |
| JP2626708B2 (en) | Scanning optical system | |
| JP2002258185A (en) | Beam synthesizing method, beam synthesizing prism multibeam scanning light source device and multibeam scanner | |
| JPH07174996A (en) | Raster-output-scanner image system | |
| JPH1020235A (en) | Optical scanner | |
| JPH0248630A (en) | Optical scanner | |
| JPH0157714U (en) | ||
| JPS632396B2 (en) | ||
| JP3069281B2 (en) | Optical scanning optical system | |
| JP2565944B2 (en) | Optical scanning device | |
| JPH1020230A (en) | Optical scanner | |
| JPH01200220A (en) | Light beam scanning optical system | |
| KR100717040B1 (en) | Light scanning system and image forming apparatus employing the same | |
| JPS60200217A (en) | Optical scanner | |
| JPH04170510A (en) | Post objective type scanning optical system and image forming device | |
| JPH10239608A (en) | Optical scanner | |
| JP3092155B2 (en) | Optical scanning optical system | |
| JPH01200219A (en) | Light beam scanning optical system | |
| JP3481724B2 (en) | Scanning imaging mirror for optical scanning |