JP3460360B2 - Image reading device - Google Patents
Image reading deviceInfo
- Publication number
- JP3460360B2 JP3460360B2 JP03113995A JP3113995A JP3460360B2 JP 3460360 B2 JP3460360 B2 JP 3460360B2 JP 03113995 A JP03113995 A JP 03113995A JP 3113995 A JP3113995 A JP 3113995A JP 3460360 B2 JP3460360 B2 JP 3460360B2
- Authority
- JP
- Japan
- Prior art keywords
- transparent body
- original
- holding member
- image reading
- document
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、画像読み取り装置に関
し、特に主査方向の読み取り画像幅に対応して配列され
たラインセンサ上に光画像を結像して一次元の画像デー
タに変換し、順次原稿面を副走査方向に走査し、原稿全
体を読み取る密着型画像読み取り装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and in particular, an optical image is formed on a line sensor arranged corresponding to the read image width in the main scanning direction and converted into one-dimensional image data. The present invention relates to a contact-type image reading device that sequentially scans the surface of a document in the sub-scanning direction to read the entire document.
【０００２】[0002]
【従来の技術】近年、画像読み取り装置としては、縮小
レンズを用いて、原稿を読み取る縮小レンズ方式と、原
稿幅に対応して等倍で結像させ画像を読み取る等倍光学
方式がある。先ず、縮小レンズ方式においては、原稿載
置透明体上に原稿を載置し、ミラースキャンや原稿台移
動により原稿面を走査し、縮小レンズである光学系を用
いて固体撮像素子上に結像しているため、光学系全体の
光路長が長大となり、装置が大型化するとともに、その
調整が複雑であるといった不具合を生じる。2. Description of the Related Art In recent years, as an image reading apparatus, there are a reduction lens system for reading an original by using a reduction lens and an equal-magnification optical system for forming an image at an equal magnification corresponding to the width of the original to read an image. First, in the reduction lens system, the original is placed on the original placing transparent body, the original surface is scanned by mirror scanning or movement of the original table, and an image is formed on the solid-state image sensor using the optical system which is the reduction lens. Therefore, the optical path length of the entire optical system becomes long, the apparatus becomes large, and the adjustment thereof is complicated.
【０００３】そのため、最近、等倍光学方式であるセル
ホックレンズアレイに代表されるロッドレンズアレイや
球面レンズアレイ（以下レンズアレイと称す）等を用い
て、主走査方向である原稿読み取り幅に対応して配列さ
れた一次元の固体撮像素子であるラインセンサ上に原稿
の光画像を１対１の等倍で結像し、光路長を極めて短く
した、いわゆる密着型画像読み取り装置が開発されてい
る。Therefore, recently, a rod lens array represented by a self-hoc lens array which is an equal-magnification optical system, a spherical lens array (hereinafter referred to as a lens array), or the like is used to cope with an original reading width in the main scanning direction. A so-called contact-type image reading device has been developed in which an optical image of a document is formed on a line sensor, which is a one-dimensional solid-state image pickup device arranged in parallel with each other, at an equal magnification of 1: 1 and the optical path length is extremely short. There is.
【０００４】しかし、このような密着型画像読み取り装
置では、等倍光学系として使用するレンズアレイの焦点
深度が短いため、原稿荷重により原稿載置透明体のたわ
みにより、焦点距離がずれてしまい、ＭＴＦ（Modurati
on Transfer Function）が大幅に低下するといった不具
合が生じてしまう。However, in such a contact type image reading apparatus, since the lens array used as a unit magnification optical system has a short depth of focus, the focal length is displaced due to the bending of the original placing transparent member due to the original load. MTF (Modurati
on Transfer Function) will be greatly reduced.
【０００５】図８に、このような焦点距離のずれ量によ
るＭＴＦの劣化を示す変化図を示す。この様なＭＴＦの
劣化による不具合を防止するために、特開昭６１−１４
９９２０号公報で開示されているように副走査方向の原
稿のたわみに対して、レンズアレイ及びラインセンサと
原稿載置透明体との光学的位置関係を保持するための位
置決め機構を設けたものがある。FIG. 8 is a change diagram showing the deterioration of the MTF due to such a shift amount of the focal length. In order to prevent such a problem due to the deterioration of MTF, Japanese Patent Laid-Open No. 61-14
As disclosed in Japanese Patent Publication No. 9920, there is one provided with a positioning mechanism for maintaining the optical positional relationship between the lens array and the line sensor and the original placing transparent body against the deflection of the original in the sub-scanning direction. is there.
【０００６】以下に従来の画像読み取り装置の光学系ユ
ニットについて説明する。図６は光学系ユニットの要部
側断面図である。１は光学系ユニット、２は原稿、３は
光学系ユニット１を形成するための保持部材、４は原稿
２に光を照射するＬＥＤアレー、５は原稿２を載せて原
稿２の光学的位置決めを可能にする原稿載置透明体、６
は光量等の大きさに応じた電気信号に変換する固体撮像
素子を用いたラインセンサ、７は原稿２から反射し原稿
載置透明体５を透過した光画像をラインセンサ６に１対
１の等倍で結像させるレンズアレイである。The optical system unit of the conventional image reading apparatus will be described below. FIG. 6 is a side sectional view of the main part of the optical system unit. Reference numeral 1 is an optical system unit, 2 is an original document, 3 is a holding member for forming the optical system unit 1, 4 is an LED array for irradiating the original document 2 with light, 5 is the original document 2, and the optical positioning of the original document 2 is performed. Document placing transparent body to enable 6
Is a line sensor using a solid-state image sensor that converts into an electric signal according to the magnitude of light amount, etc. 7 is a one-to-one line sensor 6 for an optical image reflected from the original 2 and transmitted through the original placing transparent body 5. It is a lens array that forms an image at a unity magnification.
【０００７】ここで、光学系ユニット１は、保持部材３
の型枠により、ラインセンサ６とレンズアレイ７の光学
的位置決めを行う。このように密着型の光学系ユニット
１は光路長を非常に短くでき、画像読み取り装置の小型
化ができるという特徴を有するが、上述のように原稿２
とラインセンサ６との焦点深度のずれ量に対して画像特
性のＭＴＦが大幅に低下するため、画像特性を劣化させ
る。このため、原稿２を原稿載置透明体５に載せて、光
学系ユニット１のラインセンサ６への焦点深度を確保す
るようにしている設定している。Here, the optical system unit 1 includes a holding member 3
The line sensor 6 and the lens array 7 are optically positioned by the mold of (1). As described above, the contact-type optical system unit 1 has a feature that the optical path length can be extremely shortened and the image reading apparatus can be downsized.
Since the MTF of the image characteristic significantly decreases with respect to the amount of shift in the depth of focus between the line sensor 6 and the line sensor 6, the image characteristic is deteriorated. For this reason, the original 2 is placed on the original placing transparent body 5 so as to secure the depth of focus of the optical system unit 1 to the line sensor 6.
【０００８】以上のように構成された光学系ユニットを
組み込んだ従来の画像読み取り装置について説明する。
図７は画像読み取り装置本体の主走査方向の光学系ユニ
ットの取り付け状態を示す要部断面図である。１は光学
系ユニット、５は原稿載置透明体、８はカバーケースで
ある。２１は光学系ユニット１の両端部に取り付けられ
た支持アーム、２２は支持アーム２１の端部に軸着され
た両端部位置決め用コロであり、両端部位置決め用コロ
２２が原稿載置透明体５に付勢されていることにより、
光学系ユニット１と原稿載置透明体５との光学的距離を
保持する。また、２３は付勢用支持部材、２４は光学系
ユニット１をカバーケース８に沿って副走査方向に滑ら
かに移動させるために付勢用支持部材２３の両端部に軸
着された付勢用コロ、２５は光学系ユニット１と付勢用
支持部材２３の間に介在し位置決め用コロ２２を原稿載
置透明体５に当接付勢する付勢用スプリングである。こ
こで、付勢部材は、付勢用支持部材２３，付勢用コロ２
４及び付勢用スプリング２５から構成される。これによ
り、原稿載置透明体５上の原稿２と光学系ユニット１の
ラインセンサ６との焦点深度が保持されるようになって
いる。A conventional image reading apparatus incorporating the optical system unit configured as described above will be described.
FIG. 7 is a cross-sectional view of essential parts showing a mounting state of the optical system unit in the main scanning direction of the image reading apparatus main body. Reference numeral 1 is an optical system unit, 5 is an original placing transparent body, and 8 is a cover case. Reference numeral 21 is a support arm attached to both ends of the optical system unit, 22 is a both end positioning roller pivotally attached to the end of the support arm 21, and both end positioning rollers 22 are the original placement transparent body 5 By being urged by
The optical distance between the optical system unit 1 and the original placing transparent body 5 is maintained. Further, 23 is a biasing support member, and 24 is a biasing member axially attached to both ends of the biasing support member 23 in order to smoothly move the optical system unit 1 along the cover case 8 in the sub-scanning direction. Rollers 25 are biasing springs interposed between the optical system unit 1 and the biasing support member 23 to bias the positioning roller 22 against the original placing transparent body 5. Here, the urging member includes the urging support member 23 and the urging roller 2
4 and a biasing spring 25. As a result, the depth of focus between the document 2 on the document mounting transparent body 5 and the line sensor 6 of the optical system unit 1 is maintained.
【０００９】以上のように構成された従来の画像読み取
り装置について、以下その動作を説明する。まず、最大
読み込み原稿幅に形成されている光学系ユニット１のラ
インセンサ６上に光画像を結像して、原稿２の主走査方
向の１ラインの画像を読み取る。次に、原稿面を副走査
方向に順次走査し、１ラインの画像を繰り返し読み取る
ことにより、原稿全体を読み取る。ここで、光学系ユニ
ット１及び付勢部材等はステッピングモーター等の駆動
モーター（図示せず）により副走査方向に移動する。The operation of the conventional image reading apparatus configured as described above will be described below. First, an optical image is formed on the line sensor 6 of the optical system unit 1 formed to have the maximum reading document width, and one line image of the document 2 in the main scanning direction is read. Next, the document surface is sequentially scanned in the sub-scanning direction, and the image of one line is repeatedly read to read the entire document. Here, the optical system unit 1, the biasing member, and the like are moved in the sub-scanning direction by a drive motor (not shown) such as a stepping motor.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら上記従来
の構成では、主走査方向の読み取り画像幅に対応して配
列されたラインセンサ６に像を投影し、原稿面を副走査
方向に走査して原稿画像を読み取る際、図９（ａ）に示
すように、原稿荷重によって原稿載置透明体５及びカバ
ーケース８が副走査方向へたわむ場合にはレンズアレイ
７と原稿載置透明体５上の原稿２との距離が保持できる
が、図９（ｂ）に示すように主走査方向に原稿載置透明
体５がたわんでしまった場合、レンズアレイ７の焦点深
度から離れて図８に示すように焦点距離のずれ量により
ＭＴＦが大幅に低下するといった問題点を有していた。However, in the above conventional configuration, an image is projected on the line sensor 6 arranged corresponding to the read image width in the main scanning direction, and the document surface is scanned in the sub scanning direction to scan the document. When the image is read, as shown in FIG. 9A, when the original placing transparent body 5 and the cover case 8 bend in the sub-scanning direction due to the original load, the lens array 7 and the original placing on the original placing transparent body 5 are read. 2 can be maintained, but when the original placing transparent body 5 is bent in the main scanning direction as shown in FIG. 9B, the distance from the focal depth of the lens array 7 is increased, as shown in FIG. There is a problem that the MTF is significantly reduced due to the shift amount of the focal length.
【００１１】また、原稿等から非常に大きな荷重をうけ
た場合、原稿載置透明体５が主走査方向に大きくたわん
で図９（ｂ）のごとく原稿載置透明体５が光学系ユニッ
ト１の保持部材３に接触して、駆動モーターの異常負荷
発生等が起き読み込みエラー、駆動モーター等の故障、
又は原稿載置透明体の割れの発生する要因となる。さら
に、原稿載置透明体５の表面に傷が入り、常に画像に縦
筋が入る等の画像の悪化をきたすという致命的な問題点
を有していた。Further, when a very large load is applied from a document or the like, the document placing transparent body 5 is largely deflected in the main scanning direction, and the document placing transparent body 5 becomes the optical system unit 1 as shown in FIG. 9B. Contact with the holding member 3 causes abnormal load on the drive motor, which causes reading error, failure of drive motor, etc.
Alternatively, it may cause cracking of the original placing transparent body. Further, there is a fatal problem that the surface of the original placing transparent body 5 is scratched and vertical streaks always appear in the image, which causes deterioration of the image.
【００１２】本発明は上記従来の問題点を解決するもの
で、原稿の荷重による原稿載置透明体のたわみを防止
し、解像度の高い画像品質及び信頼性に優れた画像読み
取り装置を提供することを目的とする。The present invention solves the above-mentioned conventional problems, and provides an image reading apparatus which prevents the deflection of the original placing transparent body due to the load of the original document and has a high resolution image quality and excellent reliability. With the goal.
【００１３】[0013]
【課題を解決するための手段】この目的を達成するため
に本発明の請求項１に記載の画像読み取り装置は、原稿
を搭載し原稿の位置合わせ基準面となる原稿載置透明体
と、主走査方向の最大読み取り画像幅に対応して配列さ
れたラインセンサと、原稿に光を斜めから照射する光源
アレイと、原稿から反射して原稿載置透明体を透過した
光画像をラインセンサに結像するレンズアレイと、ライ
ンセンサと光源アレイとレンズアレイとが配置されてい
る保持部材と、原稿載置透明体の方向に対して保持部材
の所定間隔を持つために保持部材の両端部又は端部に近
接した側面に固着された複数の両端部位置決め部材と、
複数の両端部位置決め部材が原稿載置透明体に対して付
勢するように保持部材を付勢する付勢部材と、を備えた
原稿を順次副走査方向に走査して原稿全体を読み取る画
像読み取り装置であって、保持部材が略中央部の両側面
の少なくとも１側面に固着された中央部位置決め部材
を、備えた構成を有している。In order to achieve this object, an image reading apparatus according to a first aspect of the present invention comprises an original placing transparent body on which an original is mounted and which serves as a reference plane for aligning the original. A line sensor arranged corresponding to the maximum read image width in the scanning direction, a light source array that irradiates the original with light obliquely, and an optical image reflected from the original and transmitted through the original placing transparent body are connected to the line sensor. A lens array for imaging, a holding member on which the line sensor, the light source array, and the lens array are arranged, and both ends or ends of the holding member so that the holding member has a predetermined space in the direction of the original placing transparent body. A plurality of both-ends positioning members fixed to the side surface close to the part,
Image reading in which the entire document is read by sequentially scanning the document in the sub-scanning direction, which includes a biasing member that biases the holding member so that the plurality of both-ends positioning members bias the document mounting transparent body. In the device, the holding member includes a central portion positioning member fixed to at least one side surface of both side surfaces of the substantially central portion.
【００１４】本発明の請求項２に記載の画像読み取り装
置は、請求項１において、中央部位置決め部材が、原稿
載置透明体に対して原稿載置透明体の面部に対し所定間
隙を空けて配設されている構成を有している。An image reading apparatus according to a second aspect of the present invention is the image reading apparatus according to the first aspect, wherein the central portion positioning member is spaced from the original placing transparent body by a predetermined gap with respect to the surface portion of the original placing transparent body. It has the structure arrange | positioned.
【００１５】本発明の請求項３に記載の画像読み取り装
置は、請求項１又は２において、中央部位置決め部材及
び／又は両端部位置決め部材が、保持部材又は保持部材
に固着している支持アーム固定部材に固着されるための
長孔状の位置調整孔部と、位置調整孔部に貫通して、中
央部位置決め部材及び／又は両端部位置決め部材を、保
持部材又は支持アーム固定部材に、固着させ位置調整固
定部材と、を備えた構成を有している。According to a third aspect of the present invention, in the image reading apparatus according to the first or second aspect, the central positioning member and / or the both-end positioning members are fixed to the holding member or the supporting arm fixed to the holding member. An elongated hole-shaped position adjusting hole for fixing to a member, and a central positioning member and / or both end positioning members are fixed to a holding member or a support arm fixing member by penetrating the position adjusting hole. And a position adjustment fixing member.
【００１６】本発明の請求項４に記載の画像読み取り装
置は、請求項１乃至３のいずれか１において、中央部位
置決め部材が、保持部材に固着されている中央部支持ア
ームと、中央部支持アームの端部に軸着されている回転
部材と、を備えた構成を有している。An image reading apparatus according to a fourth aspect of the present invention is the image reading apparatus according to any one of the first to third aspects, wherein the central portion positioning member has a central portion supporting arm fixed to the holding member, and the central portion supporting member. And a rotating member pivotally attached to the end of the arm.
【００１７】ここで、中央部支持アームの端部に軸着さ
れている回転部材としてコロ，ベアリング等を用いた回
転方式，レール方式，ラックとピニオン方式等が用いら
れる。また、回転部材の材質として、ポリアセタール，
ナイロン等が用いられる。Here, a rotating system using rollers, bearings, etc., a rail system, a rack and pinion system, etc. are used as a rotating member axially attached to the end of the central supporting arm. Also, as the material of the rotating member, polyacetal,
Nylon or the like is used.
【００１８】[0018]
【作用】この構成によって、主走査方向の原稿載置透明
体のたわみを、上記複数の位置決め部材によって防止で
き、焦点ぼけのない鮮明な画像を得ることができる。ま
た、原稿の荷重によって生じる原稿載置透明体の主走査
方向のたわみに対して、中央部位置決め用コロが原稿載
置透明体に対して所定の間隙を持って配置されることに
より、原稿載置透明体にある程度の過負荷が生じたとき
のみ、原稿載置透明体を支持する。With this configuration, the deflection of the original placing transparent body in the main scanning direction can be prevented by the plurality of positioning members, and a clear image without defocus can be obtained. Further, since the central positioning roller is arranged with a predetermined gap with respect to the original placing transparent body against the deflection of the original placing transparent body in the main scanning direction caused by the load of the original, the original placing transparent body is placed. The original placing transparent body is supported only when the placing transparent body is overloaded to some extent.
【００１９】このため、常時、中央部位置決め用コロが
原稿載置透明体に接することがないため、原稿載置透明
体を汚すことが非常に少なく、また、常時設定した間隙
より焦点深度のズレ量が小さく、画質悪化を最小限に抑
えることができ安定した画像品質を得ることができる。For this reason, since the central part positioning roller does not always contact the original placing transparent body, the original placing transparent body is hardly polluted, and the depth of focus deviates from the constantly set gap. The amount is small, deterioration of image quality can be suppressed to a minimum, and stable image quality can be obtained.
【００２０】また、中央部位置決め用コロと原稿載置透
明体が接触した場合において、中央部位置決め用コロが
原稿載置透明体上を回動するため、光学系ユニットの保
持部材に接触することがなく、原稿載置透明体の表面に
傷をつけることを防止できるとともに、副走査方向に移
動させる駆動モーターの過負荷を防止でき、画像の歪み
及び駆動モーターの故障等を防止することができる。Further, when the central portion positioning roller and the original placing transparent body come into contact with each other, the central portion positioning roller rotates on the original placing transparent body, so that the central portion positioning roller comes into contact with the holding member of the optical system unit. It is possible to prevent scratches on the surface of the document placing transparent body, prevent overload of the drive motor moving in the sub-scanning direction, and prevent image distortion and drive motor failure. .
【００２１】また、光学系ユニットの保持部材を付勢部
材により付勢しているため、原稿のより大きな荷重に対
してより柔軟に対応でき、さらに駆動モーターの過負荷
及び原稿載置透明体の割れ等を防止することができる。Further, since the holding member of the optical system unit is urged by the urging member, it is possible to more flexibly cope with a larger load of the document, and further, the overload of the drive motor and the transparency of the document placing transparent body. It is possible to prevent cracks and the like.
【００２２】[0022]
【実施例】以下本発明の一実施例における画像読み取り
装置について、図面を参照しながら説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An image reading apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
【００２３】図１は本発明の一実施例における画像読み
取り装置の走査機構系の主走査方向要部側断面図であ
り、図２は本発明の一実施例における画像読み取り装置
の光学系ユニットの保持部材の上面図であり、図６は従
来例と同様、画像読み取り装置の光学系ユニットの断面
図である。１は光学系ユニット、２は原稿、３は保持部
材、４はＬＥＤアレー、５は原稿載置透明体、６はライ
ンセンサ、７はレンズアレイ、８はカバーケース、２３
は付勢用支持部材、２４は付勢用コロ、２５は付勢用ス
プリングである。ここで、付勢部材は付勢用支持部材２
３，付勢用コロ２４，付勢用スプリング２５から構成さ
れる。これらは、従来例と同様なものなので、同一の符
号を付して説明を省略する。従来例と異なるのは、中央
部位置決め部材として、光学系ユニット１の保持部材３
の略中央部に設けた中央部支持アーム１０ａ，１０ｂと
回転部材としての中央部位置決め用コロ１２ａ，１２ｂ
を設けた点である。さらに中央部位置決め用コロ１２
ａ、１２ｂと原稿載置透明体５とは所定の距離ｂをなす
間隙が設けられている。FIG. 1 is a sectional side view of a main portion of a scanning mechanism system of an image reading apparatus according to an embodiment of the present invention in the main scanning direction, and FIG. 2 is an optical system unit of the image reading apparatus according to an embodiment of the present invention. FIG. 7 is a top view of the holding member, and FIG. 6 is a cross-sectional view of an optical system unit of the image reading device as in the conventional example. 1 is an optical system unit, 2 is a document, 3 is a holding member, 4 is an LED array, 5 is a document mounting transparent body, 6 is a line sensor, 7 is a lens array, 8 is a cover case, and 23.
Is a support member for biasing, 24 is a roller for biasing, and 25 is a spring for biasing. Here, the urging member is the urging support member 2
3, it comprises an urging roller 24 and an urging spring 25. Since these are the same as those in the conventional example, the same reference numerals are given and description thereof is omitted. The difference from the conventional example is that the holding member 3 of the optical system unit 1 is used as the central positioning member.
Center support arms 10a, 10b provided at substantially the center of the center and center part positioning rollers 12a, 12b as rotating members
That is the point. Furthermore, the central positioning roller 12
A space is provided between a and 12b and the original placing transparent body 5 to form a predetermined distance b.
【００２４】以上のように構成された本実施例の画像読
み取り装置における光学ユニットの位置決め調整方法に
ついて説明する。図３は、本実施例における画像読み取
り装置の保持部材の中央部付近の要部断面図である。１
は光学系ユニット、３は保持部材、３′は保持部材３の
側面に固着される中央部支持アーム固定部材である。５
はガラスを用いた原稿載置透明体、１２ａ，１２ｂは中
央部位置決め用コロ、１３ａ，１３ｂは中央部支持アー
ム、１４ａ．１４ｂは中央部支持アーム１３ａ，１３ｂ
を固定する固定ネジである。１５ａ，１５ｂは中央部支
持アーム１３ａ，１３ｂに設けられた上下移動設定が可
能な長孔状の位置調整用孔部であり、原稿載置透明体５
に対する中央部位置決め用コロ１２ａ，１２ｂとの間隙
幅が設定可能な位置決め調整機構を備えている。また、
中央部支持アーム１３ａ，１３ｂは、固定ネジ１４ａ，
１４ｂによって中央部支持アーム固定部材３′等に固定
することができる。この間隙幅ｂの設定は、精度よく作
成された治具、又は実際のラインセンサ６の画像出力を
モニタリングしながら中央部支持アーム１３ａ，１３ｂ
と両端部支持アーム９ａ，９ｂの位置を調整して、固定
ネジ１４ａ，１４ｂで固定する。また、付勢用支持部材
２４に付勢用コロ２５が設けられており、付勢用スプリ
ング２５によって、両端部位置決め用コロ１１ａ，１１
ｂ，１１ｃが原稿載置透明体５に当接付勢され、保持部
材３内との距離が一定に保たれ、光学系ユニット１と原
稿載置透明体５との焦点距離が確保されるようになって
いる。ここで、中央部支持アーム１３ａ，１３ｂを取り
付ける中央部支持アーム固定部材３′は、保持部材３の
側面に固着されているが、中央部支持アーム１３ａ，１
３ｂを直接保持部材３に固着してもよい。また、この位
置調整機構は、両端部位置決め部材にも用いて、光学系
ユニット１と原稿載置透明体５との光学的距離の調整に
用いることもできる。A method for adjusting the positioning of the optical unit in the image reading apparatus of this embodiment having the above-described structure will be described. FIG. 3 is a cross-sectional view of essential parts near the central portion of the holding member of the image reading apparatus in this embodiment. 1
Is an optical system unit, 3 is a holding member, and 3'is a central support arm fixing member fixed to the side surface of the holding member 3. 5
Is an original placing transparent member using glass, 12a and 12b are central positioning rollers, 13a and 13b are central supporting arms, and 14a. 14b is a central support arm 13a, 13b
It is a fixing screw for fixing. Reference numerals 15a and 15b are elongated hole-shaped position adjusting holes which are provided in the central support arms 13a and 13b and which can be set to move up and down.
There is provided a positioning adjustment mechanism capable of setting a gap width between the central portion positioning rollers 12a and 12b. Also,
The central support arms 13a and 13b are fixed screws 14a,
It can be fixed to the central support arm fixing member 3'and the like by 14b. The gap width b is set by adjusting the jigs accurately prepared or the center support arms 13a and 13b while monitoring the actual image output of the line sensor 6.
Then, the positions of both end support arms 9a and 9b are adjusted and fixed with fixing screws 14a and 14b. Further, the biasing support member 24 is provided with a biasing roller 25, and the biasing spring 25 causes the both end portion positioning rollers 11 a, 11 to be positioned.
b and 11c are urged to abut the original placing transparent body 5 so that the distance to the inside of the holding member 3 is kept constant and the focal length between the optical system unit 1 and the original placing transparent body 5 is secured. It has become. Here, the central support arm fixing member 3 ′ to which the central support arms 13 a and 13 b are attached is fixed to the side surface of the holding member 3, but the central support arms 13 a and 1
3b may be directly fixed to the holding member 3. This position adjusting mechanism can also be used for both end positioning members to adjust the optical distance between the optical system unit 1 and the original placing transparent body 5.
【００２５】一般に、原稿載置透明体５と光学系ユニッ
ト１内のラインセンサ６の距離は±０．１ｍｍの精度が
要求されるのに対し、画像読み取り装置で一般に使用さ
れている縦３００ｍｍ、横３６０ｍｍ、厚さ３ｍｍの強
化ガラス（ヤング率７．５×１０5ｋｇ／ｃｍ3）を使用
し、このガラス板に集中荷重３ｋｇをかけると、最大た
わみを生じる中央部で、変位量ａ＝０．２５ｍｍとな
り、レンズアレイ７の焦点深度からはずれＭＴＦが低下
する。Generally, the distance between the original placing transparent body 5 and the line sensor 6 in the optical system unit 1 is required to have an accuracy of ± 0.1 mm, while the vertical length of 300 mm which is generally used in an image reading apparatus, When tempered glass (Young's modulus 7.5 × 10 5 kg / cm 3 ) having a width of 360 mm and a thickness of 3 mm is used and a concentrated load of 3 kg is applied to this glass plate, the displacement amount a = It becomes 0.25 mm, which is out of the depth of focus of the lens array 7, and the MTF is reduced.
【００２６】以上のように本実施例の構成によれば、中
央部位置決め用コロ１２ａ、１２ｂが原稿の荷重によっ
て生じる原稿載置透明体５のたわみを防止し、原稿載置
透明体５との間隙の設定幅ｂより焦点深度のズレ量が大
きくなることがなくなる。具体的には、焦点深度のずれ
量が０である合焦点に対して、焦点深度のずれが０．１
ｍｍである時、図８に示すレンズアレイ３のＭＴＦ特性
でみると約５％のＭＴＦの劣化があるだけである。光学
ユニット１の両端部位置決め用コロ１１ａ，１１ｂ，１
１ｃは常に原稿載置透明体５と当接しているため主走査
方向の両端部は常に焦点深度の合った画像を得ることが
できる。また、図８に示すように、ＭＴＦは合焦点を境
にして、距離が離れる又は近づくにつれＭＴＦが急激に
劣化していくが、合焦点からのずれ量が小さい場合、Ｍ
ＴＦの低下も極めて少ない。このＭＴＦの特性を利用し
て、図５に示すように、原稿の荷重等を予め考慮して、
両端部位置決め用コロ１１ａ，１１ｂ，１１ｃと両端部
支持アーム９ａ，９ｂを用いて、原稿載置透明体５と光
学系ユニット１との距離を予め大きく設定しておくこと
により、両端部の画像は常に焦点深度が僅かにずれてい
るが、実用上全く問題のない画像特性が得られるととも
に、中央部のずれ量の許容値を大きくすることができ、
全体としてバランスのとれた画像特性を得ることができ
る。ここで、原稿載置透明体５と中央部位置決め用コロ
１２ａ，１２ｂとの設定する間隙幅は、使用するレンズ
アレイ７の焦点深度や保持部材３のセンサアレイ６，レ
ンズアレイ７の位置決め精度等によって適切に決定され
る。As described above, according to the structure of the present embodiment, the central portion positioning rollers 12a and 12b prevent the original placing transparent body 5 from being bent due to the load of the original, and the central portion positioning transparent bodies 5 and the original placing transparent body 5 are prevented from bending. The deviation amount of the depth of focus does not become larger than the set width b of the gap. Specifically, with respect to the in-focus point where the shift amount of the depth of focus is 0, the shift of the depth of focus is 0.1.
When it is mm, the MTF characteristic of the lens array 3 shown in FIG. 8 shows only about 5% MTF deterioration. Rollers 11a, 11b, 1 for positioning both ends of the optical unit 1
Since 1c is always in contact with the original placing transparent body 5, both ends in the main scanning direction can always obtain an image with a focused depth. Further, as shown in FIG. 8, the MTF sharply deteriorates as the distance increases or decreases at the in-focus point as a boundary, but when the amount of deviation from the in-focus point is small, M
The decrease in TF is also extremely small. Utilizing the characteristics of this MTF, as shown in FIG.
By using the both end positioning rollers 11a, 11b, 11c and the both end support arms 9a, 9b to set a large distance between the original placing transparent body 5 and the optical system unit 1 in advance, the images of both ends can be obtained. , The depth of focus is always slightly shifted, but it is possible to obtain image characteristics with no problems in practical use, and it is possible to increase the allowable value of the amount of shift in the center.
It is possible to obtain balanced image characteristics as a whole. Here, the gap width set between the original placing transparent body 5 and the central portion positioning rollers 12a and 12b is the depth of focus of the lens array 7 to be used, the sensor array 6 of the holding member 3, the positioning accuracy of the lens array 7, etc. Appropriately determined by
【００２７】以上のように本実施例によれば、中央部位
置決め用コロ１２ａ、１２ｂを原稿載置透明体５の下部
に設定幅ｂだけの所定間隙を設けて調整固定し、保持部
材３と原稿載置透明体５の下部との距離をレンズアレイ
７の焦点深度内に保ちつつ原稿が走査されることによっ
て主副両方向への原稿載置透明体５のたわみに対して、
図４（ａ），図４（ｂ）に示すようにレンズアレイ７の
位置が常に補正され許容焦点深度内に保つことができ
る。また、原稿荷重によって発生する原稿載置透明体５
と保持部材３の接触を回避することが可能になる。ま
た、原稿載置透明体５にある程度以上のたわみが発生し
た時のみ、中央部位置決め用コロ１２ａ、１２ｂが当接
することから摩耗粉及び縦筋等の不具合も生じにくい。
さらに図４（ｂ）に示すように、過度の原稿荷重をうけ
て原稿載置透明体５が主走査方向に大きくたわんでも、
中央部位置決め用コロ１２ａ，１２ｂにより原稿載置透
明体５と光学系ユニット１の保持部材３が接触すること
を確実に防止でき、かつ、副走査方向の移動がコロに滑
らかに行われるため、駆動モータ−の異常負荷発生及び
故障等を防止することができ、信頼性のある画像読み取
り装置を得ることができる。As described above, according to this embodiment, the central portion positioning rollers 12a and 12b are adjusted and fixed to the lower portion of the original placing transparent body 5 with a predetermined gap of the set width b between them and the holding member 3. As the original is scanned while keeping the distance from the lower portion of the original placing transparent body 5 within the focal depth of the lens array 7, the bending of the original placing transparent body 5 in both the main and sub directions is
As shown in FIGS. 4A and 4B, the position of the lens array 7 is always corrected and can be kept within the allowable depth of focus. Also, the original placing transparent body 5 generated by the original load
It is possible to avoid contact between the holding member 3 and the holding member 3. Further, only when the original placing transparent body 5 is bent to a certain extent or more, the central positioning rollers 12a and 12b come into contact with each other, so that defects such as abrasion powder and vertical stripes are unlikely to occur.
Further, as shown in FIG. 4B, even if the original placing transparent body 5 is largely deflected in the main scanning direction due to an excessive original load,
Since the central part positioning rollers 12a, 12b can reliably prevent the original placing transparent body 5 and the holding member 3 of the optical system unit 1 from contacting each other, and the movement in the sub-scanning direction is smoothly performed on the rollers. It is possible to prevent the occurrence of abnormal load and failure of the drive motor, and to obtain a reliable image reading device.
【００２８】ここで、本実施例では、原稿載置透明体５
はガラスを用いたが、アクリル等の樹脂材料を用いても
同様の効果を得ることができる。特に、パーソナル分野
におけるユーザの安全上の確保のために、たわみの大き
い樹脂等の使用に対しても、このたわみに対する補正や
支持機構は極めて有効になる。Here, in the present embodiment, the original placing transparent body 5
Although glass is used, the same effect can be obtained by using a resin material such as acrylic. In particular, in order to ensure the safety of the user in the personal field, even when a resin or the like having a large deflection is used, the correction and the support mechanism for this deflection are extremely effective.
【００２９】また、本実施例では、中央部の位置決め用
部材は光学系ユニット１の保持部材３の両側に設けた
が、原稿載置透明体５の強度等により、片側のみ又は複
数個用いて構成してもよい。また、光学系ユニット１の
保持部材３に取り付けた位置決め部材の両端部位置決め
用コロ１１ａ，１１ｂ，１２ｂは、原稿載置透明体５に
当接付勢させているが、原稿載置透明体５を固定するカ
バーケース８に当接付勢させることにより、光学系ユニ
ット１と原稿載置透明体５との光学的距離を保持させて
もよい。Further, in this embodiment, the central positioning member is provided on both sides of the holding member 3 of the optical system unit 1. However, depending on the strength of the original placing transparent body 5 or the like, only one side or a plurality thereof may be used. You may comprise. Further, the both end positioning rollers 11a, 11b, 12b of the positioning member attached to the holding member 3 of the optical system unit 1 are urged to abut against the original placing transparent body 5, but the original placing transparent body 5 The optical distance between the optical system unit 1 and the document placing transparent body 5 may be maintained by urging the cover case 8 that fixes the sheet to abut.
【００３０】[0030]
【発明の効果】以上のように本発明は、原稿載置透明体
に対して両端部の位置決め部材と、中央部の位置決め部
材を設けることによって、光学系ユニットと原稿載置透
明体の焦点深度の確保ができ、原稿載置透明体の主副両
走査方向のたわみを防止し、原稿画像を読み取り走査で
きるようにしたため、解像度の低下の少ない安定した均
一な画像特性を有する実用性に優れた画像読み取り装置
を実現することができる。As described above, according to the present invention, by providing the positioning members at both ends and the central positioning member with respect to the original placing transparent body, the focal depths of the optical system unit and the original placing transparent body are provided. It is possible to secure the image quality and prevent the original placing transparent body from being deflected in both the main and sub scanning directions so that the original image can be read and scanned. An image reading device can be realized.
【００３１】また、中央部位置決め用コロを原稿載置透
明体の下部に距離ｂだけ間隙を設けて調整固定すること
により、光学系ユニットの保持部材と原稿載置透明体の
下部との距離をレンズアレイの焦点深度内に保ちつつ原
稿を走査することができ、原稿載置透明体の主走査方向
のひずみに対しても、レンズアレイの位置が常に許容焦
点深度内に保つことができる。Further, the central positioning roller is adjusted and fixed to the lower portion of the original placing transparent body with a gap of a distance b, whereby the distance between the holding member of the optical system unit and the lower portion of the original placing transparent body is adjusted. The original can be scanned while being kept within the depth of focus of the lens array, and the position of the lens array can always be kept within the allowable depth of focus even with respect to distortion of the transparent plate on which the original is placed in the main scanning direction.
【００３２】また、原稿荷重によって発生する原稿載置
透明体と光学系ユニットの保持部材との接触を最小限に
回避することが可能になる。すなわち、原稿載置透明体
のたわみが設定した距離以上に発生した時のみ、中央部
の位置決め用コロが当接回動することから摩耗粉及び縦
筋等の不具合も最小限に押さえることができる。Further, it becomes possible to minimize the contact between the original placing transparent body and the holding member of the optical system unit, which is caused by the original load. That is, since the positioning roller in the central portion abuts and rotates only when the deflection of the original placing transparent body occurs over a set distance, it is possible to minimize defects such as abrasion powder and vertical stripes. .
【００３３】さらに、原稿等の過度の荷重をうけて原稿
載置透明体が主走査方向に大きくたわんで原稿載置透明
体と保持部材が接触することがなく、駆動モーターの異
常負荷発生等を防止することができる画像特性，信頼性
に優れた画像読み取り装置を実現することができる。Further, the original placing transparent body is not largely bent in the main scanning direction due to the excessive load of the original or the like, and the original placing transparent body and the holding member do not come into contact with each other. It is possible to realize an image reading device having excellent image characteristics and reliability that can be prevented.
【図１】本発明の一実施例における画像読み取り装置本
体の主走査方向の光学系ユニットの取り付け状態を示す
要部側断面図FIG. 1 is a side sectional view of an essential part showing an attached state of an optical system unit in a main scanning direction of an image reading apparatus main body according to an embodiment of the present invention.
【図２】本発明の一実施例における画像読み取り装置の
光学系ユニットの上面図FIG. 2 is a top view of an optical system unit of the image reading apparatus according to the embodiment of the present invention.
【図３】本発明の一実施例における画像読み取り装置の
保持部材の中央部付近の要部断面図FIG. 3 is a cross-sectional view of a main portion near a central portion of a holding member of an image reading apparatus according to an embodiment of the present invention.
【図４】（ａ）本発明の一実施例における画像読み取り
装置の副走査方向に沿って光学系ユニットの移動を示す
模式図
（ｂ）本発明の一実施例における画像読み取り装置の主
走査方向の光学系ユニットと原稿載置台との示す模式図FIG. 4A is a schematic diagram showing movement of an optical system unit along the sub-scanning direction of the image reading apparatus according to the embodiment of the present invention. FIG. 4B is a main scanning direction of the image reading apparatus according to the embodiment of the present invention. Schematic diagram showing the optical system unit and the document table
【図５】本発明の一実施例における画像読み取り装置の
ＭＴＦの変化を示す曲線図FIG. 5 is a curve diagram showing changes in MTF of the image reading apparatus according to the embodiment of the present invention.
【図６】一般的な画像読み取り装置の光学系ユニットの
要部側断面図FIG. 6 is a side sectional view of an essential part of an optical system unit of a general image reading apparatus.
【図７】従来の画像読み取り装置本体の主走査方向の光
学系ユニットの取り付け状態を示す断面図FIG. 7 is a cross-sectional view showing a mounting state of an optical system unit in a main scanning direction of a conventional image reading apparatus main body.
【図８】焦点距離のずれ量によるＭＴＦの劣化を示す曲
線図FIG. 8 is a curve diagram showing deterioration of MTF due to a shift amount of a focal length.
【図９】（ａ）従来の画像読み取り装置の副走査方向の
原稿載置透明体のたわみ状態を示す要部斜視図
（ｂ）従来の画像読み取り装置の主走査方向の原稿載置
透明体のたわみ状態を示す要部斜視図FIG. 9A is a perspective view of a main part of a conventional image reading apparatus showing a bent state of a document placing transparent body in a sub-scanning direction. FIG. 9B is a view showing a document placing transparent body in a main scanning direction of a conventional image reading apparatus. Perspective view of essential parts showing flexure
１ 光学系ユニット ２ 原稿 ３ 保持部材 ３′ 中央部支持アーム固定部材 ４ ＬＥＤアレイ ５ 原稿載置透明体 ６ ラインセンサ ７ レンズアレイ ８ カバーケース ９，９ａ，９ｂ 両端部支持アーム １０ａ，１０ｂ，１３ａ，１３ｂ 中央部支持アーム １１，１１ａ，１１ｂ，１１ｃ 両端部位置決め用コロ １２ａ，１２ｂ 中央部位置決めコロ １４ａ，１４ｂ 固定ネジ １５ａ，１５ｂ 位置調整用孔部 ２１ 支持アーム ２２ 位置決め用コロ ２３ 付勢用支持部材 ２４ 付勢用コロ ２５ 付勢用スプリング 1 Optical system unit 2 manuscripts 3 holding member 3'central support arm fixing member 4 LED array 5 Original placement transparent body 6 line sensor 7 lens array 8 cover case 9, 9a, 9b Both end support arms 10a, 10b, 13a, 13b Central support arm 11, 11a, 11b, 11c Positioning rollers for both ends 12a, 12b Central positioning roller 14a, 14b fixing screw 15a, 15b Position adjusting hole 21 Support arm 22 Positioning roller 23 Biasing support member 24 biasing rollers 25 Biasing spring
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｎ 1/107 (56)参考文献 特開 昭63−87864（ＪＰ，Ａ) 特開 昭63−118145（ＪＰ，Ａ) 特開 昭63−311861（ＪＰ，Ａ) 特開 平２−154247（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04N 1/00 - 1/207 G06T 1/00 G06T 1/60 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI H04N 1/107 (56) References JP-A-63-87864 (JP, A) JP-A-63-118145 (JP, A) Kai 63-311861 (JP, A) JP-A-2-154247 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H04N 1/00-1/207 G06T 1/00 G06T 1/60
Claims (4)
となる原稿載置透明体と、主走査方向の最大読み取り画
像幅に対応して配列されたラインセンサと、前記原稿に
光を斜めから照射する光源アレイと、前記原稿から反射
して前記原稿載置透明体を透過した光画像を前記ライン
センサに結像するレンズアレイと、前記ラインセンサと
前記光源アレイと前記レンズアレイとが配置されている
保持部材と、前記原稿載置透明体の方向に対して前記保
持部材の所定間隔を持つために前記保持部材の両端部又
は端部に近接した側面に固着された複数の両端部位置決
め部材と、複数の前記両端部位置決め部材が前記原稿載
置透明体に対して付勢するように前記保持部材を付勢す
る付勢部材と、を備えた前記原稿を順次副走査方向に走
査して前記原稿全体を読み取る画像読み取り装置であっ
て、前記保持部材が略中央部の両側面の少なくとも１側
面に固着された中央部位置決め部材を、備えたことを特
徴とする画像読み取り装置。1. An original placing transparent body on which an original is mounted and which serves as a reference plane for aligning the original, a line sensor arranged corresponding to the maximum read image width in the main scanning direction, and light obliquely incident on the original. A light source array for irradiating from a document, a lens array for forming an optical image reflected from the document on the line sensor and transmitted through the document mounting transparent body, the line sensor, the light source array, and the lens array. Holding member and a plurality of both end portions fixed to both end portions of the holding member or side surfaces close to the end portion so as to have a predetermined gap between the holding member and the direction of the original placing transparent body. The document is sequentially scanned in the sub-scanning direction, including a member and a biasing member that biases the holding member such that the plurality of both-ends positioning members bias the document mounting transparent body. All the above manuscripts An image reading apparatus for reading an image reading apparatus in which said retaining member is a central positioning member secured to at least one side surface of both side surfaces of the substantially central portion, with the.
透明体に対して前記原稿載置透明体の面部に対し所定間
隙を空けて配設されていることを特徴とする請求項１に
記載の画像読み取り装置。2. The central positioning member is disposed with respect to the original placing transparent body with a predetermined gap from the surface of the original placing transparent body. The image reading device described.
端部位置決め部材が、前記保持部材又は前記保持部材に
固着している支持アーム固定部材に固着されるための長
孔状の位置調整孔部と、前記位置調整孔部に貫通して、
前記中央部位置決め部材及び／又は前記両端部位置決め
部材を、前記保持部材又は前記支持アーム固定部材に、
固着させ位置調整固定部材と、を備えたことを特徴とす
る請求項１又は２に記載の画像読み取り装置。3. An elongated hole-shaped position adjusting hole portion for fixing the central portion positioning member and / or the both end portion positioning members to the holding member or a support arm fixing member fixed to the holding member. And, penetrating the position adjusting hole,
The central part positioning member and / or the both end part positioning members to the holding member or the support arm fixing member,
The image reading apparatus according to claim 1, further comprising: a position adjustment fixing member that is fixedly attached.
に固着されている中央部支持アームと、前記中央部支持
アームの端部に軸着されている回転部材と、を備えたこ
とを特徴とする請求項１乃至３のいずれか１に記載の画
像読み取り装置。4. The center part positioning member includes a center part support arm fixed to the holding member, and a rotating member axially attached to an end part of the center part support arm. The image reading device according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03113995A JP3460360B2 (en) | 1995-02-20 | 1995-02-20 | Image reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03113995A JP3460360B2 (en) | 1995-02-20 | 1995-02-20 | Image reading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08228266A JPH08228266A (en) | 1996-09-03 |
| JP3460360B2 true JP3460360B2 (en) | 2003-10-27 |
Family
ID=12323115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03113995A Expired - Fee Related JP3460360B2 (en) | 1995-02-20 | 1995-02-20 | Image reading device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3460360B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003143377A (en) * | 2001-10-31 | 2003-05-16 | Canon Inc | Image reader |
| JP2007041318A (en) * | 2005-08-03 | 2007-02-15 | Ricoh Co Ltd | Image reader and image forming apparatus |
| JP2007067810A (en) * | 2005-08-31 | 2007-03-15 | Brother Ind Ltd | Image reading device |
| JP2007158487A (en) * | 2005-12-01 | 2007-06-21 | Seiko Epson Corp | Spacer and image read-out unit and image forming apparatus provided therewith |
| JP4605029B2 (en) * | 2006-01-19 | 2011-01-05 | ブラザー工業株式会社 | Image sensor |
| JP4259543B2 (en) | 2006-05-16 | 2009-04-30 | ブラザー工業株式会社 | Image reading device |
| JP4962003B2 (en) | 2006-12-28 | 2012-06-27 | ブラザー工業株式会社 | Image reading device |
| JP5023712B2 (en) * | 2007-01-19 | 2012-09-12 | ブラザー工業株式会社 | Image sensor |
| JP4771105B2 (en) * | 2009-03-31 | 2011-09-14 | ブラザー工業株式会社 | Image reading device |
| JP6124532B2 (en) | 2011-09-02 | 2017-05-10 | キヤノン株式会社 | Image reading apparatus and image forming apparatus having the same |
-
1995
- 1995-02-20 JP JP03113995A patent/JP3460360B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08228266A (en) | 1996-09-03 |
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