JPH09166758A - Optical scanner - Google Patents

Optical scanner

Info

Publication number
JPH09166758A
JPH09166758A JP32663895A JP32663895A JPH09166758A JP H09166758 A JPH09166758 A JP H09166758A JP 32663895 A JP32663895 A JP 32663895A JP 32663895 A JP32663895 A JP 32663895A JP H09166758 A JPH09166758 A JP H09166758A
Authority
JP
Japan
Prior art keywords
lens
light source
scanned
graded index
point
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
JP32663895A
Other languages
Japanese (ja)
Inventor
Tetsuya Saito
哲哉 斎藤
Yasukazu Sano
安一 佐野
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric 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 Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP32663895A priority Critical patent/JPH09166758A/en
Publication of JPH09166758A publication Critical patent/JPH09166758A/en
Pending legal-status Critical Current

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  • Mechanical Optical Scanning Systems (AREA)

Abstract

PROBLEM TO BE SOLVED: To almost linearly scan an object to e scanned and to miniaturize a scanner by arranging a graded index lens between a light source and the object to be scanned and relatively moving the light source and the graded index lens. SOLUTION: A lens 2B is arranged between a light source 1 and an object 4 to be scanned. A graded index lens 2B whose refractive index is changed according to a distance in the radial direction from the center of the optical axis is used for the lens 2B. The graded index lens 2B has the same image forming action as a convex lens when it has a proper length, the image of the bright point P of the light source 1 is formed at a point Q1 when the lens 2B is located e.g. on the position of a solid line and it is formed at a point Q2 when the lens 2B is located on the position of a dotted line. Namely, bright points P1, P2,... located on a straight line are formed at their images on Q1, Q2,... in a straight line by means of the lens 2B. Consequently, by relatively moving the light source 1 and the graded index lens 2B, the object 4 to be scanned is scanned.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】この発明は、例えばバーコー
ドリーダやレーザビームプリンタ等に用いて好適な光ス
キャナに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical scanner suitable for use in, for example, a bar code reader or a laser beam printer.

【0002】[0002]

【従来の技術】図3にこの種の従来例を示す。これは、
光源1、レンズ2および多面鏡(ポリゴンミラー)3を
配置し、回転駆動されるポリゴンミラー3に光源1から
レンズ2を介して光を照射することにより、被走査体4
上を走査(スキャン)するものである。
2. Description of the Related Art FIG. 3 shows a conventional example of this kind. this is,
The light source 1, the lens 2, and the polygon mirror (polygon mirror) 3 are arranged, and the polygon mirror 3 that is driven to rotate is irradiated with light from the light source 1 through the lens 2 to scan the scanned object 4.
The upper part is scanned.

【0003】図3の方式では、被走査体4上のフォーカ
シングポイントが点線で示すように湾曲する(焦点深度
が浅い)ことから、図4の如くする方式も提案されてい
る。これは、同図からも明らかなように、図3に示すも
のに対しポリゴンミラー3と被走査体4との間に、他の
レンズ2Aを設けることにより、フォーカシングポイン
トをほぼ直線状にするものである。
In the system shown in FIG. 3, the focusing point on the object to be scanned 4 is curved as shown by the dotted line (the depth of focus is shallow). Therefore, the system shown in FIG. 4 is also proposed. This is, as is clear from the figure, in which the focusing point is made substantially linear by providing another lens 2A between the polygon mirror 3 and the scanned body 4 in contrast to the one shown in FIG. Is.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、図4の
ような従来方式では寸法が大きくなり、スペース的な問
題が生じる。したがって、この発明の課題は小形化を図
りスペース上の問題を解消することにある。
However, in the conventional method as shown in FIG. 4, the size becomes large and a space problem occurs. Therefore, an object of the present invention is to reduce the size and solve the problem of space.

【0005】[0005]

【課題を解決するための手段】かかる問題を解決するた
め、光源と被走査体との間に屈折率分布型レンズを配置
し、前記光源と屈折率分布型レンズとを相対的に移動さ
せることにより、被走査体上をほぼ直線的に走査し得る
ようにする。屈折率分布型レンズは数mmオーダであ
り、光源の輝点の僅かな動きを比較的大きな像点の動き
として捉えられるので、全体的に小形化が可能となる。
In order to solve such a problem, a gradient index lens is arranged between a light source and a scanning object, and the light source and the gradient index lens are moved relative to each other. Thus, the object to be scanned can be scanned almost linearly. Since the gradient index lens is of the order of several mm, and a slight movement of the bright spot of the light source can be recognized as a movement of a relatively large image point, it is possible to downsize the lens as a whole.

【0006】[0006]

【発明の実施の形態】図1はこの発明の実施の形態を示
す概要図、図2はその作用を説明するための説明図であ
る。図1に示すように、この例は光源1と被走査体との
間にレンズ2Bを配置した点が特徴である。ここで、レ
ンズ2Bはその光軸中心から半径方向への距離に応じて
屈折率が変化する、いわゆる屈折率分布型レンズを用い
るものとする。
1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram for explaining its operation. As shown in FIG. 1, this example is characterized in that a lens 2B is arranged between the light source 1 and the object to be scanned. Here, it is assumed that the lens 2B uses a so-called gradient index lens in which the refractive index changes according to the distance from the center of the optical axis in the radial direction.

【0007】この屈折率分布型レンズは、適当な長さの
場合は凸レンズと同様な結像作用を有する。したがっ
て、レンズ2Bが例えば実線の位置にあるときは、光源
の輝点Pの像が点Q1に形成され、レンズ2Bが点線の
位置にあるきとは点Q2に形成される。つまり、光源1
の輝点は図2(イ)にも示すように、レンズ2Bにより
一直線上にある輝点P1,P2…は点Q1,Q2…のよ
うに一直線上に結像される。したがって、光源1と屈折
率分布型レンズ2Bとを相対的に動かすことにより、被
走査体4上をスキャンすることが可能であることが分か
る。
This gradient index lens element has an image forming action similar to that of a convex lens when it has an appropriate length. Therefore, when the lens 2B is in the position of the solid line, for example, the image of the bright point P of the light source is formed at the point Q1, and when the lens 2B is in the position of the dotted line, it is formed at the point Q2. That is, the light source 1
2A, the bright points P1, P2, ..., which are on a straight line by the lens 2B, are imaged on a straight line, like points Q1, Q2 ,. Therefore, it can be seen that the object 4 to be scanned can be scanned by relatively moving the light source 1 and the gradient index lens 2B.

【0008】ここで、図2(ロ)を参照して具体的な寸
法例について説明する。いま、例えばピッチPi=0.
25、屈折率分布定数√Aが0.43(波長が0.63
μm)、中央屈折率n0 が1.658の屈折率分布型レ
ンズ2Bを用い、入射輝点位置をr1 (mm)とする
と、出射角度θ(rad)は、 θ=−n0 ・√A・r1 で与えられることが知られている。
Here, a specific example of dimensions will be described with reference to FIG. Now, for example, the pitch Pi = 0.
25, refractive index distribution constant √A is 0.43 (wavelength is 0.63
μm) and the refractive index distribution type lens 2B having a central refractive index n 0 of 1.658 and the incident bright spot position is r 1 (mm), the emission angle θ (rad) is θ = −n 0 · √ It is known to be given by A · r 1 .

【0009】そこで、r1 =0.45mm、s=300
mmとすると、R=100mmとなり、輝点の僅かな動
きを像点の大きな動きとして捉えることが可能となり、
実用的な数値となる。なお、駆動機構5としては電気機
械相互作用を生じさせる圧電素子や、永久磁石と電磁石
を用いるもの、さらにはマイクロマシンなど小形化の可
能な機構を採用することができる。また、図1ではレン
ズ2Bの方を動かすようにしているが光源1の方を動か
しても良く、要は光源1とレンズ2Bとを相対的に移動
させるようにすれば良いわけである。
Therefore, r 1 = 0.45 mm, s = 300
If mm, R = 100 mm, and it becomes possible to capture a slight movement of the bright spot as a large movement of the image point.
It is a practical value. As the drive mechanism 5, a piezoelectric element that causes an electromechanical interaction, a mechanism that uses a permanent magnet and an electromagnet, or a mechanism that can be downsized such as a micromachine can be used. Further, although the lens 2B is moved in FIG. 1, the light source 1 may be moved, and the point is that the light source 1 and the lens 2B are moved relatively.

【0010】以上のことから、光源の輝点の僅かな動き
を比較的大きな動きにし得るミリメートルオーダの屈折
率分布型レンズと、かかるレンズまたは光源の駆動手段
として小形なものを用いることで、フォーカシングポイ
ントをほぼ直線状にしつつ、装置全体の寸法を小さくす
ることが可能となる。
From the above, focusing can be performed by using a millimeter-order graded-index lens that can make a slight movement of a bright spot of a light source a relatively large movement and a small lens or driving means for the light source. It is possible to reduce the size of the entire device while making the points substantially linear.

【0011】[0011]

【発明の効果】この発明によれば、屈折率分布型レンズ
を用い、これを光源に対して相対的に動かすだけの簡単
な機構により、全体の寸法を小さくしフォーカシングポ
イントをほぼ直線状にすることができるという利点が得
られる。
According to the present invention, the entire size is reduced and the focusing point is made substantially linear by using the gradient index lens and moving it relatively to the light source. The advantage is that it can.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明による実施の形態を示す概要図であ
る。
FIG. 1 is a schematic diagram showing an embodiment according to the present invention.

【図2】図1の動作を説明するための説明図である。FIG. 2 is an explanatory diagram for explaining the operation of FIG.

【図3】従来例を示す概要図である。FIG. 3 is a schematic diagram showing a conventional example.

【図4】他の従来例を示す概要図である。FIG. 4 is a schematic diagram showing another conventional example.

【符号の説明】[Explanation of symbols]

1…光源、2,2A,2B…レンズ、3…ポリゴンミラ
ー、4…被走査体、5…駆動機構、P,P1,P2,P
3,P4…輝点、Q1,Q2,Q3,Q4…結像点。
1 ... Light source, 2, 2A, 2B ... Lens, 3 ... Polygon mirror, 4 ... Scan object, 5 ... Driving mechanism, P, P1, P2, P
3, P4 ... Bright spots, Q1, Q2, Q3, Q4 ... Imaging points.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 光源と被走査体との間に屈折率分布型レ
ンズを配置し、前記光源と屈折率分布型レンズとを相対
的に移動させることにより、被走査体上をほぼ直線的に
走査可能にしたことを特徴とする光スキャナ。
1. A gradient index lens is disposed between a light source and a scanned object, and the light source and the gradient index lens are moved relative to each other, so that the scanned object is substantially linear. Optical scanner characterized by being scannable.
JP32663895A 1995-12-15 1995-12-15 Optical scanner Pending JPH09166758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32663895A JPH09166758A (en) 1995-12-15 1995-12-15 Optical scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32663895A JPH09166758A (en) 1995-12-15 1995-12-15 Optical scanner

Publications (1)

Publication Number Publication Date
JPH09166758A true JPH09166758A (en) 1997-06-24

Family

ID=18190027

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32663895A Pending JPH09166758A (en) 1995-12-15 1995-12-15 Optical scanner

Country Status (1)

Country Link
JP (1) JPH09166758A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100495237B1 (en) * 2002-09-30 2005-06-14 김선태 Eye sight correction lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100495237B1 (en) * 2002-09-30 2005-06-14 김선태 Eye sight correction lens

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