JPH0630201A - Image reader - Google Patents
Image readerInfo
- Publication number
- JPH0630201A JPH0630201A JP4182304A JP18230492A JPH0630201A JP H0630201 A JPH0630201 A JP H0630201A JP 4182304 A JP4182304 A JP 4182304A JP 18230492 A JP18230492 A JP 18230492A JP H0630201 A JPH0630201 A JP H0630201A
- Authority
- JP
- Japan
- Prior art keywords
- carriage
- optical path
- image
- reading
- scanning
- 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
Landscapes
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、縮小光学系を備えた画
像読取り装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus having a reduction optical system.
【０００２】[0002]
【従来の技術】ディジタル複写機、スキャナ等の原稿読
取り装置では、光源と、これによりスリット照明された
原稿を結像レンズによりＣＣＤユニットに結像させて原
稿の画像を読取る縮小光学系を備えている。2. Description of the Related Art A document reading device such as a digital copying machine or a scanner is equipped with a light source and a reduction optical system for reading an image of a document by forming an image of a document slit-illuminated by the image forming lens on a CCD unit. There is.
【０００３】光源を一定の走査速度で原稿面に平行に移
動させて走査し、原稿面からの反射光を結像レンズによ
りＣＣＤユニット上に結像させる読取り光学系として
は、図４に示すように、コンタクトガラス１上に載置さ
れた原稿２を光源３によりスリット照射し、その反射光
を第１ミラー４により原稿面に平行に反射させ、互いに
直交する第２、第３ミラー５，６を経て逆方向に反射さ
せ、結像レンズ７によりＣＣＤ８上に結像させ、その場
合、レンズ７及びＣＣＤ８は装置機枠に固定し、光源３
が移動しても原稿側光路長が変化しないようにする手段
として、光源３と第１ミラー４とを一体的に第１キャリ
ッジ１０に担持し、第２、第３ミラー５，６を第２キャ
リッジ１１に担持し、第１キャリッジを一定の速度ｖで
原稿面に平行に移動させ、第２キャリッジ１１をｖ／２
の速度で同期して同方向に移動させるようにした構成の
ものが一般に採用されている。FIG. 4 shows a reading optical system in which a light source is moved in parallel with the original surface at a constant scanning speed for scanning, and light reflected from the original surface is imaged on a CCD unit by an imaging lens. Then, the document 2 placed on the contact glass 1 is slit-illuminated by the light source 3, and the reflected light is reflected by the first mirror 4 in parallel to the document surface, and the second and third mirrors 5, 6 are orthogonal to each other. And then reflected in the opposite direction and imaged on the CCD 8 by the imaging lens 7, in which case the lens 7 and the CCD 8 are fixed to the device frame and the light source 3
The light source 3 and the first mirror 4 are integrally carried on the first carriage 10, and the second and third mirrors 5 and 6 are used as second means so that the optical path length on the document side does not change even when the document is moved. The carriage 11 is carried, the first carriage is moved in parallel with the document surface at a constant speed v, and the second carriage 11 is moved to v / 2.
Generally, a structure in which they are moved in the same direction in synchronization with each other at a speed is used.
【０００４】この光学系は、例えば、特開平３−２２０
５７４号公報、特開平３−２４５１３５号公報、特開平
３−１４２４２８号公報等にも示されているアナログ複
写機の原稿露光々学系に広く採用されているものと概ね
同じである。第１キャリッジと第２キャリッジとを１：
１／２の速度比で同期して同方向に移動させる機構とし
ては、例えば図５に示す如く、１台のモータ１２で機枠
に固定された複数のプーリ１５に掛け渡された手前側と
奥側の各１本のワイヤロープ１４ａ，１４ｂを駆動し、
第１キャリッジ１０の両端をワイヤロープ１４ａ，１４
ｂに固定し、第２キャリッジ１１の両端に軸支されたプ
ーリ１６に両側からワイヤロープを巻回し、いわゆる動
滑車の原理を利用したものが一般に利用されている。This optical system is disclosed, for example, in Japanese Patent Laid-Open No. 3-220.
This is almost the same as that widely used in the original exposure learning system of an analog copying machine, which is also shown in Japanese Patent Laid-Open No. 574, Japanese Patent Laid-Open No. 3-245135, Japanese Patent Laid-Open No. 3-142428. The first carriage and the second carriage are 1:
As a mechanism for synchronously moving in the same direction at a speed ratio of ½, as shown in FIG. 5, for example, as shown in FIG. 5, one motor 12 and a front side that is wound around a plurality of pulleys 15 fixed to a machine frame are used. Drive each one wire rope 14a, 14b on the back side,
Connect both ends of the first carriage 10 to the wire ropes 14a, 14
It is generally used that the pulley is fixed to b and the wire rope is wound from both sides around the pulley 16 that is rotatably supported at both ends of the second carriage 11, and the principle of so-called dynamic pulley is used.
【０００５】しかし、この構成は駆動ワイヤロープの配
回が複雑で部品の点数も多く、組付け、ワイヤ掛けの手
数も掛る欠点があった。However, this structure has a drawback in that the driving wire rope is laid out in a complicated manner, the number of parts is large, and the number of assembling and wire hanging is also required.
【０００６】[0006]
【本発明が解決しようとする課題】本発明は、従来の画
像読取り装置の光路長を不変に維持して読取り走査を行
なうためのキャリッジ移動機構の上述の欠点にかんが
み、簡単な構成で、光路長を確実に一定に保持して読取
り走査を行なうことのできる画像読取り装置を提供する
ことを課題とする。SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the carriage moving mechanism for performing the reading scan while keeping the optical path length of the conventional image reading apparatus unchanged, the present invention has a simple structure and an optical path. An object of the present invention is to provide an image reading device capable of performing reading scanning while surely holding the length constant.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記の課題を
解決するため、光源と、これによりスリット照明された
原稿の反射光を結像レンズによりＣＣＤユニットに結像
させて原稿の画像を読取る縮小光学系を備えた画像読取
り装置において、上記光源を担持する第１キャリッジ
と、上記の結像レンズとＣＣＤユニットとを担持する第
２キャリッジとを同時に等速で移動させて読取り走査を
行なうことを特徴とする。In order to solve the above-mentioned problems, the present invention forms an image of a document by forming a light source and reflected light of a document slit-illuminated by the image on a CCD unit by an imaging lens. In an image reading apparatus equipped with a reduction optical system for reading, a first carriage carrying the light source and a second carriage carrying the imaging lens and the CCD unit are simultaneously moved at a constant speed to perform reading scanning. It is characterized by
【０００８】[0008]
【作用】上記の構成により、原稿走査のため第１キャリ
ッジと第２キャリッジとを同時に等速で移動させるので
第１キャリッジと第２キャリッジとの間の光路に沿う距
離は常に不変であり、一定の光路長を維持することがで
きる。With the above construction, the first carriage and the second carriage are simultaneously moved at the same speed for scanning the original, so that the distance along the optical path between the first carriage and the second carriage is always constant and constant. The optical path length can be maintained.
【０００９】光学系の光路の原稿読取り走査方向に平行
に逆方向に折り返すミラーを固定して設けた場合は、第
１キャリッジと第２キャリッジとを互いに逆方向に移動
させることができるので、第１，第２キャリッジをエン
ドレスベルトの上走部と下走部に固着する等の簡単な構
成の駆動装置を採用することが可能となる。If a mirror that is folded back in the opposite direction parallel to the original scanning direction of the optical path of the optical system is fixedly provided, the first carriage and the second carriage can be moved in the opposite directions. It is possible to employ a drive device having a simple structure in which the first and second carriages are fixed to the upper running portion and the lower running portion of the endless belt.
【００１０】[0010]
【実施例】以下に、本発明の実施例を、図面に基づいて
詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１１】図１は、本発明による読取光学系の実施例
を示す図である。この実施例では図４の従来の光学系と
同じ機能を有する光学要素には同一の符号が付されてい
る。FIG. 1 is a diagram showing an embodiment of a reading optical system according to the present invention. In this embodiment, optical elements having the same functions as those of the conventional optical system shown in FIG. 4 are designated by the same reference numerals.
【００１２】異る点は第２、第３ミラー５、６が装置機
枠に固定されており、結像レンズ７とＣＣＤ８とが第２
キャリッジ１７に担持されて一体的に移動可能となって
いる点である。第１キャリッジ１０と第２キャリッジ１
７とは同一速度ｖで互いに逆方向に同期して原稿走査方
向に平行に移動する。原稿面からレンズ７に至る光路
は、装置に固定された第２、第３ミラー５，６で入射方
向と逆方向に折返されるので、第１キャリッジ１０と第
２キャリッジ１７とが互いに逆方向に等速で移動するこ
とにより、原稿面からレンズ７迄の光路長は常に一定に
保持される。The difference is that the second and third mirrors 5 and 6 are fixed to the apparatus frame, and the imaging lens 7 and the CCD 8 are second.
The point is that they are carried by the carriage 17 and can move integrally. First carriage 10 and second carriage 1
It moves in parallel with the scanning direction of the document at the same speed v as that of 7 in synchronism with each other. The optical path from the document surface to the lens 7 is folded back in the direction opposite to the incident direction by the second and third mirrors 5 and 6 fixed to the apparatus, so that the first carriage 10 and the second carriage 17 are in opposite directions. By moving at a constant speed, the optical path length from the document surface to the lens 7 is always kept constant.
【００１３】アナログ複写機の露光々学系では、感光体
の周囲には帯電チャージャ、現像装置、転写チャージ
ヤ、クリーニングユニットが感光体周面と正確な間隙を
保って配設されているので、露光走査時感光体を装置に
対して移動させることはできない。しかし、ＣＣＤを使
用するディジタル複写機やスキャナ等の画像読取り装置
ではＣＣＤの出力はリード線でＣＰＵに出力されるの
で、読取り走査時移動させることが可能である。又、画
像読取り装置では、原稿光は縮小してＣＣＤ上に結像さ
れるで結像レンズとＣＣＤユニットとの距離は短かく、
結像レンズとＣＣＤユニットとを一つのキャリッジに搭
載することは容易である。本発明はこの特徴を利用した
ものである。In the exposure science system of an analog copying machine, a charging charger, a developing device, a transfer charger, and a cleaning unit are arranged around the photoconductor with an accurate gap from the peripheral surface of the photoconductor. The photoreceptor cannot be moved relative to the device during scanning. However, in an image reading device such as a digital copying machine or a scanner that uses a CCD, the output of the CCD is output to the CPU through a lead wire, so that it can be moved during reading scanning. In the image reading device, the original light is reduced and focused on the CCD, so that the distance between the imaging lens and the CCD unit is short.
It is easy to mount the imaging lens and the CCD unit on one carriage. The present invention utilizes this feature.
【００１４】上記のように、第１キャリッジと第２キャ
リッジとを互いに逆方向に等速で同期して移動させる機
構の一例を、図２および図３に示す。手前側と奥側との
両方で機枠に位置を固定して設けられた走査方向両側に
設けられたプーリ２５ａと２５ｂ、２５ｄと２５ｃとに
エンドレスワイヤロープ２３ａ、２３ｂが掛け渡されて
いる。プーリ２５ｂと２５ｃとはモータ２４で正逆両方
向に回転駆動される１本の軸２６の両端に固定されてい
る。2 and 3 show an example of a mechanism for moving the first carriage and the second carriage in the opposite directions in synchronism with each other at a constant speed as described above. Endless wire ropes 23a and 23b are stretched around pulleys 25a and 25b, 25d and 25c provided on both sides in the scanning direction, the positions of which are fixed to the machine frame on both the front side and the rear side. The pulleys 25b and 25c are fixed to both ends of one shaft 26 which is rotationally driven by a motor 24 in both forward and reverse directions.
【００１５】手前側と奥側のワイヤロープ２３ａ，２３
ｂの夫々の上走部の相対する位置には第１キャリッジ１
０の長手方向両端部が固定され、ワイヤロープ２３ａ，
２３ｂの夫々の下走部の相対する位置には第２キャリッ
ジ１７の両端部が固定されている。The front and rear wire ropes 23a, 23
The first carriage 1 is provided at a position where the upper running portions of b are opposed to each other.
0 is fixed at both ends in the longitudinal direction, and the wire rope 23a,
Both ends of the second carriage 17 are fixed to the opposite positions of the respective lower running portions of 23b.
【００１６】したがって、モータ２４を回転させれば、
１対のワイヤロープ２３ａ，２３ｂは同期して等速で移
動し、上走部に固定された第１キャリッジ１０と下走部
に固定された第２キャリッジ１７とは同期して等速で互
いに逆方向に移動する。Therefore, if the motor 24 is rotated,
The pair of wire ropes 23a, 23b synchronously move at a constant speed, and the first carriage 10 fixed to the upper running portion and the second carriage 17 fixed to the lower running portion are synchronized with each other at a constant speed. Move in the opposite direction.
【００１７】この実施例のように、第１、第２キャリッ
ジの手前側と奥側との夫々をワイヤロープで駆動するよ
うにした場合は、いずれか一方の側のみを駆動し他方は
ガイドレール上をコロで転動させ、又は摺動させるよう
にした場合よりもスタート、ストップ時の振動を低減さ
せることができる。When the front and rear sides of the first and second carriages are driven by wire ropes as in this embodiment, only one side is driven and the other side is a guide rail. It is possible to reduce the vibration at the time of start and stop as compared with the case where the roller is rolled or slid above.
【００１８】第１、第２キャリッジを同期して等速で互
いに逆方向に移動させる手段としては、上述のエンドレ
スワイヤロープの他ピニオンギヤの上側と下側とに、こ
れに噛合うラックを走査方向に延設し、その夫々に第
１，第２キャリッジを固定するようにした機構や、走査
方向に延設されその中央部から両側に逆方向のねじを切
ったスクリューシャフトの中央部の両側に第１，第２キ
ャリッジに固定された逆方向のねじを切ったナットを螺
合させた機構等を使用することも可能である。As means for synchronously moving the first and second carriages in opposite directions at the same speed, racks meshing with the upper and lower sides of the above-mentioned endless wire rope other than the pinion gear are provided in the scanning direction. On both sides of the central part of the screw shaft extending in the scanning direction and fixing the first and second carriages respectively, and extending in the scanning direction and threading screws in opposite directions from the central part to both sides It is also possible to use a mechanism or the like in which nuts, which are screwed in opposite directions and fixed to the first and second carriages, are screwed together.
【００１９】読取るべき原稿の最大サイズに対して装置
本体の走査方向の長さが十分大きい場合は、図１の読取
り光学系において第２，第３ミラー５，６を省略し、第
１ミラーで反射した光線を直ちに結像レンズ７に入射さ
せ、ＣＣＤユニット８に結像させることも可能である。
その場合は、第１キャリッジ１０と第２キャリッジ１７
とは同期して同方向に等速で移動させればよい。その場
合のキャリッジ駆動機構は、エンドレスワイヤロープの
上走部又は下走部のいずれか一方に両キャリッジを固定
する構成や、スクリューシャフトの一方向のねじに両キ
ャリッジを螺合させる機構等種々の簡単な機構が採用可
能である。When the length of the apparatus main body in the scanning direction is sufficiently larger than the maximum size of the original to be read, the second and third mirrors 5 and 6 are omitted in the reading optical system of FIG. It is also possible to immediately make the reflected light beam enter the imaging lens 7 and form an image on the CCD unit 8.
In that case, the first carriage 10 and the second carriage 17
And may be moved in the same direction at the same speed in synchronization with. The carriage drive mechanism in that case has various structures such as a structure in which both carriages are fixed to either the upper running portion or the lower running portion of the endless wire rope, a mechanism in which both carriages are screwed into a screw in one direction of the screw shaft. A simple mechanism can be adopted.
【００２０】[0020]
【発明の効果】以上の如く、本発明によれば簡単な構成
で、光路長を確実に一定に保持して読取り走査を行なう
ことができる。As described above, according to the present invention, reading scanning can be performed with a simple structure while keeping the optical path length reliably constant.
【図１】本発明の読取り光学系の実施例を示す断面図で
ある。FIG. 1 is a sectional view showing an embodiment of a reading optical system of the present invention.
【図２】その第１，第２キャリッジの走査駆動機構の実
施例を示す斜視図である。FIG. 2 is a perspective view showing an embodiment of a scanning drive mechanism for the first and second carriages.
【図３】その作用を説明する側面図である。FIG. 3 is a side view illustrating the operation.
【図４】従来の読取り光学系の一例の構成を示す断面図
である。FIG. 4 is a cross-sectional view showing a configuration of an example of a conventional reading optical system.
【図５】その第１，第２キャリッジの走査駆動機構の一
例を示す斜視図である。FIG. 5 is a perspective view showing an example of a scanning drive mechanism for the first and second carriages.
１ コンタクトガラス ２ 原稿 ３ 光源 ４ 第１ミラー ５ 第２ミラー ６ 第３ミラー ７ 結像レンズ ８ ＣＣＤユニット １０ 第１キャリッジ １７ 第２キャリッジ ２３ａ，２３ｂ エンドレスワイヤロープ ２４ モータ 1 Contact Glass 2 Original 3 Light Source 4 First Mirror 5 Second Mirror 6 Third Mirror 7 Imaging Lens 8 CCD Unit 10 First Carriage 17 Second Carriage 23a, 23b Endless Wire Rope 24 Motor
Claims (2)
原稿の反射光を結像レンズによりＣＣＤユニットに結像
させて原稿の画像を読取る縮小光学系を備えた画像読取
り装置において、 上記光源を担持する第１キャリッジと、上記の結像レン
ズとＣＣＤユニットとを担持する第２キャリッジとを同
時に等速で移動させて読取り走査を行なうことを特徴と
する画像読取り装置。1. An image reading apparatus comprising a light source and a reduction optical system for reading an image of an original by forming an image of reflected light of the original illuminated by slit illumination on a CCD unit by an imaging lens and carrying the light source. An image reading apparatus characterized in that a first carriage for moving and a second carriage for carrying the image forming lens and the CCD unit are simultaneously moved at a constant speed to perform reading scanning.
平行に逆方向に折り返す固定されたミラーを有し、上記
第１キャリッジと第２キャリッジとを互いに逆方向に移
動することを特徴とする請求項１に記載の画像読取り装
置。2. A mirror which is fixed in such a manner that the optical path of the optical system is folded back in the opposite direction in parallel with the scanning direction for reading, and the first carriage and the second carriage are moved in opposite directions. The image reading device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4182304A JPH0630201A (en) | 1992-07-09 | 1992-07-09 | Image reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4182304A JPH0630201A (en) | 1992-07-09 | 1992-07-09 | Image reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0630201A true JPH0630201A (en) | 1994-02-04 |
Family
ID=16115954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4182304A Pending JPH0630201A (en) | 1992-07-09 | 1992-07-09 | Image reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0630201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001013173A1 (en) * | 1999-08-14 | 2001-02-22 | Cruse Hermann A | Device for optically scanning an essentially flat object |
-
1992
- 1992-07-09 JP JP4182304A patent/JPH0630201A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001013173A1 (en) * | 1999-08-14 | 2001-02-22 | Cruse Hermann A | Device for optically scanning an essentially flat object |
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