JPH10190938A - Image reader and image recorder - Google Patents
Image reader and image recorderInfo
- Publication number
- JPH10190938A JPH10190938A JP8359113A JP35911396A JPH10190938A JP H10190938 A JPH10190938 A JP H10190938A JP 8359113 A JP8359113 A JP 8359113A JP 35911396 A JP35911396 A JP 35911396A JP H10190938 A JPH10190938 A JP H10190938A
- Authority
- JP
- Japan
- Prior art keywords
- image
- sheet
- image reading
- reading
- read
- 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.)
- Granted
Links
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimiles In General (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明はシート状の原稿を搬
送し、その原稿の表裏両面の画像情報を読み取る画像読
取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 for conveying a sheet-shaped document and reading image information on both sides of the document.
【0002】[0002]
【従来の技術】従来から、流し読み方式の画像読取装置
としては、片面読取専用のスキャナとこのような両面読
取用のスキャナとがあり、画像読取部には、密着センサ
等の画像読取センサを設けたものが一般的である。2. Description of the Related Art Conventionally, as a flow-reading type image reading apparatus, there are a scanner dedicated to one-sided reading and a scanner for such a double-sided reading, and an image reading section includes an image reading sensor such as a contact sensor. What is provided is general.
【0003】片面読取専用のスキャナは、原稿の裏面か
らローラ等で押圧して原稿の読取側を原稿台ガラスに密
着させる構造となっている為に、原稿の読取画像と、画
像読取センサとの、距離は一定であり、画像情報を密着
センサに結像する為のレンズは、被写界深度の浅いレン
ズでもピントが狂う危険がなかった。[0003] The scanner for single-sided reading only has a structure in which the reading side of the original is brought into close contact with the original platen glass by pressing the back of the original with a roller or the like. The distance is constant, and there is no danger that the lens for forming image information on the contact sensor will be out of focus even with a lens having a small depth of field.
【0004】一方、原稿の両面に画像が存在する両面原
稿を一度で読み取る為には表裏両面に密着センサ等の画
像読取センサを有する両面スキャナが必要となる。この
両面スキャナにおいても、前記片面専用スキャナのよう
に、片面ずつ順番に画像を読み取っていくような搬送系
にすれば被写界深度の浅いレンズが使えるが、それでは
搬送系が非常に長くなってしまい、装置が大型化してし
まう。On the other hand, in order to read a two-sided document having images on both sides of the document at a time, a double-sided scanner having image reading sensors such as contact sensors on both front and back sides is required. Also in this double-sided scanner, a lens having a small depth of field can be used if a transport system that sequentially reads images one by one, like the single-side scanner, can be used, but the transport system becomes very long. As a result, the device becomes large.
【0005】そこで、従来の両面読取用のスキャナで
は、図6のように、原稿Sの表面の画像を読み取る画像
読取部101と、裏面の画像を読み取る画像読取部10
2とを、シートを挟んでほぼ相対する位置に配置固定
し、搬送ローラによって、2つの画像読取部の間に真直
ぐにシートを挿入するように搬送している。Therefore, in the conventional scanner for double-sided reading, as shown in FIG. 6, an image reading section 101 for reading an image on the front side of a document S and an image reading section 10 for reading an image on the back side.
2 are arranged and fixed at positions substantially opposite to each other with the sheet therebetween, and are conveyed by a conveying roller so that the sheet is inserted straight between the two image reading units.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、このよ
うな従来例において、センサ同士の距離が固定されてお
り、更に、その中間に真直ぐにシートが挿入されていた
為に、いくつかの問題が生じていた。However, in such a conventional example, the distance between the sensors is fixed, and furthermore, since the sheet is inserted straight between them, some problems arise. I was
【0007】つまり、センサ同士の距離が固定されてい
ると、非常に厚みのある原稿をにも対応させる為に、必
然的に、センサ同士の距離が離れ気味になる。すなわ
ち、原稿の搬送経路である表裏ガラスの間をある程度開
けなければならない。That is, if the distance between the sensors is fixed, the distance between the sensors is inevitably increased to accommodate a very thick document. That is, it is necessary to open the space between the front and back glass, which is the document conveyance path, to some extent.
【0008】しかし、そのように表裏ガラスの間が開い
ていると、厚さの薄い原稿を搬送する時に、原稿に腰が
なければ表裏ガラスの間で原稿が波打ってしまい、画像
読取精度の低下につながる。However, if the gap between the front and back glass is opened, when the document having a small thickness is conveyed, the document may be wavy between the front and back glass if the document does not have any rigidity, and the image reading accuracy may be reduced. Leads to a decline.
【0009】また、表裏ガラスの中間に、真直ぐにシー
トを挿入するような搬送経路であれば、原稿の厚みの変
化にともない、センサと原稿画像面との距離が変わるこ
とになる。すなわち、様々な厚みの原稿に対応して画像
読取を行なうには、センサに結像する被写界深度の深い
レンズが表裏の画像読取部において必要となる。In addition, if the transport path is such that a sheet is inserted straight between the front and back glass, the distance between the sensor and the document image surface changes with a change in the thickness of the document. That is, in order to read an image corresponding to an original having various thicknesses, a lens having a large depth of field to form an image on a sensor is required in the front and back image reading units.
【0010】更に、このような搬送経路では、上記の原
稿の波打ちも生じ易く、その補正の為に、やはり被写界
深度の深いレンズが必要となる。Further, in such a conveyance path, the above-mentioned original is likely to be wavy, and a lens having a deep depth of field is required for the correction.
【0011】しかしながら、被写界深度の深いレンズを
使用すると以下のような問題が生ずる。 1.レンズの明るさが暗くなってしまうので、光源を明
るくしなければならない。すると、発熱や消費電力の問
題が生じ、特に発熱を抑える為に放熱板や冷却ファンが
必要となり、大型化、生産性の悪化の要因となる。ま
た、光源そのものも特別なものでなければならず、生産
性が悪くなる。 2.レンズが大きくなるので、省スペース化の弊害とな
り、且つ、レンズ自体の生産性も悪い。 本発明は上記の従来技術の課題を解決するためになされ
たもので、その目的とするところは、画像読取精度を向
上させつつ、被写界深度の浅いレンズを有効に使用でき
る生産性のよい、または、厚さの厚い原稿を問題なく搬
送できる、高品質の画像読取装置を提供することにあ
る。However, using a lens with a large depth of field causes the following problems. 1. Since the brightness of the lens becomes dark, the light source must be brightened. Then, a problem of heat generation and power consumption arises. In particular, a radiator plate and a cooling fan are required to suppress heat generation, which causes a large size and a decrease in productivity. In addition, the light source itself must be special, and the productivity deteriorates. 2. Since the size of the lens becomes large, space saving is adversely affected, and the productivity of the lens itself is poor. The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to improve the image reading accuracy and improve the productivity in which a lens with a small depth of field can be effectively used. Another object of the present invention is to provide a high quality image reading apparatus capable of conveying a thick original without any problem.
【0012】[0012]
【課題を解決するための手段】上記目的を達成するため
に本発明にあっては、搬送中のシートの画像を読み取る
流し読み式の画像読取手段を、シートを挟んでほぼ相対
する位置に2つ配置し、シートの表と裏の両面の画像を
ほぼ同時に読み取る画像読取装置において、前記2つの
画像読取手段のうち、少なくとも一方の画像読取手段
と、その画像読取手段によって読み取られる画像と、の
距離が、いかなるシートを読み取る際にも常に一定であ
ることを特徴とする。In order to achieve the above object, according to the present invention, there is provided a flow-reading type image reading means for reading an image of a sheet being conveyed at a position substantially opposed to the sheet. And an image reading device for reading images on both sides of a sheet substantially simultaneously, wherein at least one of the two image reading units and an image read by the image reading unit are provided. The distance is always constant when reading any sheet.
【0013】すなわち、シートの表面か或は裏面のどち
らかは、そのシートの厚さにかかわらず常に、基準面に
位置され、よって、そちら側のレンズは、被写界深度の
深さを必要としないため、生産性のよい、被写界深度の
浅いレンズを利用できる。That is, either the front surface or the back surface of the sheet is always located at the reference plane regardless of the thickness of the sheet, and the lens on that side needs to have a depth of field. Therefore, a lens with good productivity and a small depth of field can be used.
【0014】具体的には、画像読取手段とシートとの間
に光透過性部材を配置し、この光透過性部材にシートを
密着させることで、その画像読取手段とシート上の画像
との距離を一定にすることが好適である。More specifically, a light transmissive member is arranged between the image reading means and the sheet, and the sheet is brought into close contact with the light transmissive member, so that the distance between the image reading means and the image on the sheet is increased. Is preferably constant.
【0015】また、画像読取手段の直前のシート搬送経
路を、シートが前記光透過性部材に対して密着する向き
に、形成することも好適である。It is also preferable that the sheet conveying path immediately before the image reading means is formed in a direction in which the sheet comes into close contact with the light transmitting member.
【0016】例えば、光透過性部材に対して、所定の角
度をもって当接させ、シートの柔らかさを利用して、光
透過性部材に沿って搬送させるようなシート搬送経路が
ある。For example, there is a sheet transporting path in which the sheet is brought into contact with the light transmitting member at a predetermined angle and is conveyed along the light transmitting member by utilizing the softness of the sheet.
【0017】更に、画像読取手段の直前のシート搬送経
路中に、シートを前記光透過性部材に対して押圧する押
圧手段を設けることも好適である。Further, it is preferable to provide a pressing means for pressing a sheet against the light transmitting member in a sheet conveying path immediately before the image reading means.
【0018】また、搬送中のシートの画像を読み取る流
し読み式の画像読取手段を、シートを挟んでほぼ相対す
る位置に2つ配置し、シートの表と裏の両面の画像をほ
ぼ同時に読み取る画像読取装置において、2つの画像読
取手段の距離を可変とすることを特徴とする。In addition, two flow-reading type image reading means for reading an image of a sheet being conveyed are arranged at substantially opposite positions across the sheet so that images on both the front and back sides of the sheet are read almost simultaneously. In the reading apparatus, the distance between the two image reading units is variable.
【0019】2つの画像読取手段のうち一方を固定し、
他方の画像読取手段を、固定された画像読取手段に対
し、押圧する押圧手段を設けることは好適である。One of the two image reading means is fixed,
It is preferable to provide a pressing unit that presses the other image reading unit against the fixed image reading unit.
【0020】画像記録装置であって、上記のような画像
読取装置を備え、その画像読取装置で読み取った画像を
記録する画像記録手段を有したものも好適である。It is also preferable that the image recording apparatus is provided with the above-mentioned image reading apparatus and an image recording means for recording an image read by the image reading apparatus.
【0021】[0021]
【発明の実施の形態】以下に図面を参照して、この発明
の好適な実施の形態を例示的に詳しく説明する。ただ
し、この実施の形態に記載されている構成部品の寸法、
材質、形状、その相対配置などは、特に特定的な記載が
ないかぎりは、この発明の範囲をそれらのみに限定する
趣旨のものではない。Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.
【0022】(実施の形態1)図5は、本発明を適用し
たスキャナの横断面図を表す図である。同図において1
は下部機箱、2は上部機箱で、上部機箱2は下部機箱に
対し、支点3を中心に回動自在となっている。Sは本ス
キャナで読み取るシートとしての原稿、4は原稿Sを積
載する給紙トレイ、5は原稿Sの積載枚数によって5a
を支点に回動可能な原稿台である。下部機箱1内には、
2枚目以降の原稿Sが搬送路に入らないようにする分離
ローラ6、原稿Sの下面の画像情報を照明し密着センサ
で読み取る裏面読取部7、原稿Sを機外に排出する排紙
駆動ローラ8が含まれると共に、原稿Sを案内する搬送
ガイド9や原稿Sを搬送する搬送駆動ローラ10が配置
されている。なお、排紙駆動ローラ8と搬送駆動ローラ
10は、不図示のモータと直結で駆動される。一方、上
部機箱2内には、給紙トレイ4上に積載された最も上の
原稿Sを給紙する給紙ローラ11、その原稿を機内に送
り出す送りローラ12、原稿Sの上面の画像情報を照明
し密着センサで読み取る表面読取部13、原稿Sを機外
に排出する排紙ローラ14が含まれると共に、原稿Sを
案内する搬送ガイド15や原稿Sを搬送する搬送ローラ
16が配置されている。なお、読取部の直前の搬送ガイ
ド9・15は湾曲し、読取部に対し斜め上方から進入す
るようになっている。また上部機箱2の上面17は排紙
トレイで、一対の排紙ローラ8・14で機外に排出され
た原稿Sを収容する。(Embodiment 1) FIG. 5 is a cross-sectional view of a scanner to which the present invention is applied. In FIG.
Is a lower machine box, 2 is an upper machine box, and the upper machine box 2 is rotatable about a fulcrum 3 with respect to the lower machine box. S is a document as a sheet to be read by the scanner, 4 is a paper feed tray for loading the document S, 5 is 5a depending on the number of loaded documents S.
Is a document table rotatable around the fulcrum. In the lower machine box 1,
A separation roller 6 for preventing the second and subsequent originals S from entering the transport path, a back side reading unit 7 for illuminating image information on the lower surface of the original S and reading it by a contact sensor, and a paper discharge drive for discharging the original S outside the machine A roller 8 is included, and a transport guide 9 for guiding the document S and a transport driving roller 10 for transporting the document S are arranged. The discharge drive roller 8 and the transport drive roller 10 are driven directly by a motor (not shown). On the other hand, inside the upper machine box 2, a paper feed roller 11 for feeding the uppermost document S stacked on the paper feed tray 4, a feed roller 12 for feeding the document into the machine, and image information of the upper surface of the document S are stored. A front side reading unit 13 illuminated and read by a contact sensor, a paper discharge roller 14 for discharging the document S out of the machine are included, and a transport guide 15 for guiding the document S and a transport roller 16 for transporting the document S are arranged. . The transport guides 9 and 15 immediately before the reading unit are curved, and enter the reading unit from obliquely above. The upper surface 17 of the upper machine box 2 is a paper discharge tray, which accommodates the document S discharged out of the apparatus by a pair of paper discharge rollers 8.
【0023】次に本スキャナの動作について説明する。
画像情報を読み取りたい原稿Sを給紙トレイ4上に積載
し、本スキャナと電気的に接続されているパソコン上で
スキャン開始のコマンドを転送する。すると、原稿台5
が支点5aを中心に不図示のモータで反時計方向に回動
し、原稿Sの最上紙が給紙ローラに接触すると停止す
る。この状態で給紙ローラ11が矢印方向に回転し、原
稿Sの最上紙を機内に搬送する。給紙ローラと同時に送
りローラ12も矢印方向に回転しているので、最も上の
原稿Sは更に機内奥へと導かれる。ここで分離ローラ6
は原稿搬送方向と逆方向に回転しているので、給紙トレ
イ上の上から2枚目以降の原稿Sを押し戻し、重送を防
止している。こうして搬送された原稿Sは、搬送ガイド
9・15で案内され、搬送ローラ10・16で送られ、
読取部に斜め上方から進入する。読取部では、原稿Sの
上面の画像情報を表面読取部13で、下面の画像情報を
裏面読取部7でそれぞれ読み取り、その情報をパソコン
に伝達する。その後、搬送ローラ10・16で送られた
原稿Sは、排紙ローラ対8・14で機外に排出され、排
紙トレイ17上に収容される。次に図1で、本発明の第
一の実施の形態の特徴部分である読取部を詳細に説明す
る。Next, the operation of the scanner will be described.
An original S for which image information is to be read is stacked on the paper feed tray 4, and a scan start command is transferred on a personal computer electrically connected to the scanner. Then, the platen 5
Is rotated counterclockwise around a fulcrum 5a by a motor (not shown), and stops when the uppermost sheet of the document S comes into contact with the paper feed roller. In this state, the feed roller 11 rotates in the direction of the arrow, and conveys the uppermost sheet of the document S into the apparatus. Since the feed roller 12 is also rotating in the direction of the arrow at the same time as the feed roller, the uppermost document S is further guided inside the apparatus. Here, separation roller 6
Is rotated in the direction opposite to the document transport direction, the second and subsequent documents S from the top on the paper feed tray are pushed back to prevent double feeding. The document S conveyed in this manner is guided by conveyance guides 9 and 15 and sent by conveyance rollers 10 and 16.
The reader enters the reading unit from obliquely above. In the reading unit, image information on the upper surface of the document S is read by the front surface reading unit 13, and image information on the lower surface is read by the back surface reading unit 7, and the information is transmitted to the personal computer. Thereafter, the document S sent by the transport rollers 10 and 16 is discharged out of the apparatus by a pair of discharge rollers 8 and 14 and stored on a discharge tray 17. Next, referring to FIG. 1, a reading unit which is a characteristic part of the first embodiment of the present invention will be described in detail.
【0024】表面読取部13は上部機箱2に、また裏面
読取部7は下部機箱1にそれぞれ固定されている。読取
部入口には読取駆動ローラ7aと読取従動ローラ13a
が、出口には読取駆動ローラ7bと読取従動ローラ13
bがそれぞれ配置されている。ここで読取駆動ローラ7
aと読取従動ローラ13aの各回転中心を結んだ直線
は、読取部の搬送路に対し非直角になっている。7c・
13cは光透過性部材としての透明ガラス、7d・13
dは原稿の画像情報を読み取り、電気信号に変換する画
像読取手段としての密着センサ、7e・13eは原稿の
画像情報を密着センサ上に結像するレンズ、7f・13
fは原稿を照明する光源である。読取従動ローラ13a
・13bは、表面読取ユニット13に対し、上下方向に
移動可能となっている。またそれぞれの軸は、バネ13
g・13hで読取駆動ローラ7a・7bに圧接されてい
るので、原稿の厚みに応じて読取従動ローラ13a・1
3bは上下移動する。The front side reading section 13 is fixed to the upper machine box 2 and the back side reading section 7 is fixed to the lower machine box 1, respectively. A reading drive roller 7a and a reading driven roller 13a
However, at the exit, the reading drive roller 7b and the reading driven roller 13
b are arranged respectively. Here, the reading drive roller 7
The straight line connecting a with each rotation center of the reading driven roller 13a is non-perpendicular to the conveyance path of the reading unit. 7c ・
13c is a transparent glass as a light transmitting member, 7d · 13
d is a contact sensor as image reading means for reading image information of the document and converting it into an electric signal; 7e and 13e are lenses for forming image information of the document on the contact sensor;
f is a light source for illuminating the original. Reading driven roller 13a
13b is vertically movable with respect to the front surface reading unit 13. Also, each axis is a spring 13
g and 13h are pressed against the reading drive rollers 7a and 7b.
3b moves up and down.
【0025】また、読取駆動ローラ7aの回転中心が読
取従動ローラ13aの回転中心より搬送方向奥側に配置
されているので、原稿Sの搬送方向は下方へ向けられ、
原稿裏面が裏面読取部7の透明ガラス7cの上面に接触
しながら進む。すると、まず光源13fで照射された原
稿表面の画像情報が密着センサ13dで読み取られる。
この時、表裏の透明ガラス7cと13cの間隔は一定
で、かつ原稿は裏面読取部7の透明ガラス7cに押し付
けられているので、原稿表面と透明ガラス13cの距離
は、原稿の厚み分のみ変化するだけで、原稿が波打つこ
とによる位置の変化はない。次に、光源7fで照射され
た原稿裏面の画像情報が密着センサ7dで読み取られ
る。この時、原稿裏面は透明ガラス7cに押し付けられ
ているので、原稿裏面と密着センサの位置は常に同じで
ある。従って、裏面のレンズ7eは、被写界深度の浅い
レンズを使用してもピントが狂う恐れがなく、これに伴
い光源の光量も少なくて済むので、装置の大型化及び生
産効率の低下をさせずに高精度の画像読取をすることが
できる。Further, since the rotation center of the reading drive roller 7a is located farther in the conveyance direction than the rotation center of the reading driven roller 13a, the conveyance direction of the document S is directed downward.
The back surface of the document advances while contacting the upper surface of the transparent glass 7c of the back surface reading unit 7. Then, first, the image information on the surface of the document irradiated by the light source 13f is read by the contact sensor 13d.
At this time, since the distance between the front and back transparent glasses 7c and 13c is constant and the original is pressed against the transparent glass 7c of the back side reading unit 7, the distance between the original front surface and the transparent glass 13c changes only by the thickness of the original. The position does not change due to the ripple of the original. Next, image information on the back surface of the document irradiated by the light source 7f is read by the contact sensor 7d. At this time, since the back surface of the document is pressed against the transparent glass 7c, the position of the back surface of the document and the position of the contact sensor are always the same. Therefore, the lens 7e on the back side does not lose focus even if a lens having a small depth of field is used, and accordingly, the light amount of the light source can be reduced, thereby increasing the size of the apparatus and reducing the production efficiency. High-precision image reading can be performed without the need for the image reading.
【0026】(実施の形態2)図2は第2の実施の形態
の読取部を表す図である。(Embodiment 2) FIG. 2 is a diagram showing a reading unit according to a second embodiment.
【0027】第1の実施の形態では、原稿を読取部の透
明ガラスに接触させるために、読取部直前の搬送路が湾
曲していたが、第2の実施の形態では搬送路の湾曲はな
い。その代わり、透明ガラス直前に、原稿を裏面ガラス
に圧接させるための押圧手段である原稿押さえバネ50
が設けられている。この原稿押さえバネ50を設けるこ
とにより、第1の実施の形態と同じ効果が得られる。ま
た、読取直前の搬送路を直線状にできるので、部品形状
が単純になり、原稿の搬送性能も向上する。In the first embodiment, the transport path immediately before the reading section is curved in order to bring the original into contact with the transparent glass of the reading section. However, in the second embodiment, the transport path is not curved. . Instead, immediately before the transparent glass, an original pressing spring 50 which is a pressing means for pressing the original against the back glass.
Is provided. By providing the document pressing spring 50, the same effect as in the first embodiment can be obtained. Further, since the transport path immediately before reading can be made linear, the component shape is simplified, and the transport performance of the document is improved.
【0028】また、原稿を押し付ける機能を有すれば、
原稿押さえバネ50の代わりに薄いシート等を使用して
もよい。Further, if a function for pressing a document is provided,
A thin sheet or the like may be used instead of the document pressing spring 50.
【0029】この他の構成は第1の実施の形態と共通で
あるので、説明は省略する。また、図2で示す読取部に
おいても、第1の実施の形態と共通な所の番号及び説明
は、省略する。The other configuration is the same as that of the first embodiment, and the description is omitted. Also, in the reading unit illustrated in FIG. 2, the numbers and descriptions of the parts common to the first embodiment are omitted.
【0030】(実施の形態3)図3は第3の実施の形態
の読取部を表す図である。裏面読取部60は下部機箱1
に固定されている。読取部入口には読取駆動ローラ60
aと読取従動ローラ70aが、出口には読取駆動ローラ
60bと読取従動ローラ70bがそれぞれ配置されてい
る。60c・70cは透明ガラス、60d・70dは原
稿の画像情報を読み取り、電気信号に変換する密着セン
サ、60e・70eは原稿の画像情報を密着センサ上に
結像するレンズ、60f・70fは原稿を照明する光源
である。表面読取ユニット70は上部機箱2に対し、上
下方向に移動可能で、付勢手段であるバネ70g・70
hで下方向に付勢されているので、読取従動ローラ70
a・70bが読取駆動ローラ60a・60bに圧接され
る。従って、原稿の厚みに応じて読取従動ローラ70a
・70bが上下動するので、結果的に読取ユニットが上
下に移動する。(Embodiment 3) FIG. 3 is a diagram showing a reading unit according to a third embodiment. Back side reading unit 60 is lower machine box 1
It is fixed to. A reading drive roller 60 is provided at the entrance of the reading unit.
a and a read driven roller 70a, and a reading drive roller 60b and a read driven roller 70b are disposed at the exit. 60c / 70c is a transparent glass, 60d / 70d is a contact sensor that reads image information of the document and converts it into an electric signal, 60e / 70e is a lens that forms image information of the document on the contact sensor, and 60f / 70f is a It is a light source to illuminate. The front surface reading unit 70 is vertically movable with respect to the upper machine box 2 and is a spring 70g / 70 serving as an urging means.
h, the reading driven roller 70 is urged downward.
a and 70b are pressed against the reading drive rollers 60a and 60b. Therefore, the reading driven roller 70a is set in accordance with the thickness of the original.
Since 70b moves up and down, the reading unit moves up and down as a result.
【0031】第1及び第2の実施の形態は、原稿の厚み
によってガラスに押し付けられない側(図では上側)の
ピント位置が若干狂う他、表裏のガラスの間隔が固定な
ので、それ以上厚い原稿は搬送できなかった。しかし、
第3の実施の形態では、原稿の厚みに応じて表面読取部
70が移動するので、厚さに関係なく原稿を搬送するこ
とができ、また読取駆動ローラと読取従動ローラが圧接
した状態では表裏のガラスの間隔を余り取る必要がない
ので、原稿が表裏のガラスの間で波打ったとしても、ピ
ント位置はそれほど狂わない。 (第4の実施の形態)図4は第4の実施の形態の読取部
を表す図である。裏面読取部80は下部機箱1に固定さ
れている。読取部入口には読取駆動ローラ80aと読取
従動ローラ90aが、出口には読取駆動ローラ80bと
読取従動ローラ90bがそれぞれ配置されている。80
c・90cは透明ガラス、80d・90dは原稿の画像
情報を読み取り、電気信号に変換する密着センサ、80
e・80eは原稿の画像情報を密着センサ上に結像する
レンズ、80f・90fは原稿を照明する光源である。
表面読取ユニット90は上部機箱2に対し、上下方向に
移動可能で、バネ90g・90hで下方向に付勢されて
いるので、読取従動ローラ90a・90bが読取駆動ロ
ーラ80a・80bに圧接される。従って、原稿の厚み
に応じて読取従動ローラ90a・90bが上下動するの
で、結果的に読取ユニットが上下に移動する。In the first and second embodiments, the focus position on the side that is not pressed against the glass (upper side in the figure) is slightly deviated due to the thickness of the original, and the gap between the front and back glass is fixed, so that the thicker original is used. Could not be transported. But,
In the third embodiment, since the front side reading unit 70 moves in accordance with the thickness of the original, the original can be conveyed regardless of the thickness. Since there is no need to keep the gap between the glasses, the focus position does not change so much even if the document undulates between the front and back glasses. (Fourth Embodiment) FIG. 4 is a diagram showing a reading unit according to a fourth embodiment. The back surface reading unit 80 is fixed to the lower machine box 1. A reading driving roller 80a and a reading driven roller 90a are arranged at the entrance of the reading unit, and a reading driving roller 80b and a reading driven roller 90b are arranged at the exit. 80
c / 90c is a transparent glass; 80d / 90d is a contact sensor for reading image information of a document and converting it into an electric signal;
Reference numerals e and 80e denote lenses for forming image information of the document on the contact sensor, and reference numerals 80f and 90f denote light sources for illuminating the document.
The front surface reading unit 90 is vertically movable with respect to the upper machine box 2 and is urged downward by springs 90g and 90h, so that the reading driven rollers 90a and 90b are pressed against the reading driving rollers 80a and 80b. . Accordingly, the reading driven rollers 90a and 90b move up and down according to the thickness of the document, and as a result, the reading unit moves up and down.
【0032】また、読取駆動ローラ80aの回転中心が
読取従動ローラ90aの回転中心より搬送方向奥側に配
置されているので、原稿Sの搬送方向は下方へ向けら
れ、原稿裏面が裏面読取部80の透明ガラス80cの上
面に接触しながら進む。すると、まず光源90fで照射
された原稿表面の画像情報が密着センサ90dで読み取
られる。この時、表面読取ユニットは、読取従動ローラ
90aが原稿の厚みで持ち上げられた分だけ上方向に移
動するので、原稿表面と表面密着センサ90dの距離は
原稿の厚みに関係なく、常に一定となる。次に、光源8
0fで照射された原稿裏面の画像情報が密着センサ80
dで読み取られる。この時、原稿裏面は透明ガラス80
cに押し付けられているので、原稿裏面と密着センサ8
0dとの距離は常に同じである。Further, since the rotation center of the reading drive roller 80a is located farther in the conveyance direction than the rotation center of the reading driven roller 90a, the conveyance direction of the document S is directed downward, and the back surface of the document S Of the transparent glass 80c. Then, first, the image information on the surface of the document irradiated by the light source 90f is read by the contact sensor 90d. At this time, the front-side reading unit moves upward by the amount by which the reading driven roller 90a is lifted by the thickness of the document, so that the distance between the front surface of the document and the surface contact sensor 90d is always constant regardless of the thickness of the document. . Next, the light source 8
The image information on the back side of the document irradiated with 0f
Read at d. At this time, the back of the original is transparent glass 80
c, so that the back of the document and the contact sensor 8
The distance from 0d is always the same.
【0033】従って、表面のレンズ90e及び裏面のレ
ンズ80eは、被写界深度の浅いレンズを使用してもピ
ントが狂う恐れがなく、これに伴い光源の光量も少なく
て済むので、装置の大型化及び生産効率の低下をひきお
こすことなく両面画像の読取精度を向上させることがで
きる。Accordingly, the front lens 90e and the rear lens 80e do not become out of focus even when a lens having a small depth of field is used, and the light amount of the light source can be reduced accordingly. It is possible to improve the reading accuracy of a double-sided image without causing a reduction in production efficiency and production efficiency.
【0034】また、原稿の厚みに応じて表面読取部90
が移動するので、厚さに関係なく原稿を搬送することが
できる。Further, the front-side reading unit 90 according to the thickness of the document
Moves, so that the original can be conveyed regardless of the thickness.
【0035】(その他の実施の形態)前述した実施の形
態では、本発明を適用した画像読取装置として搬送原稿
の画像を読み取るスキャナを例示したが、本発明はこれ
に限定されるものではなく、例えば複写機、ファクシミ
リ装置等の画像記録装置において、原稿画像読み取り部
に本発明を適用しても上記効果と同様の効果を得ること
ができる。(Other Embodiments) In the above-described embodiment, a scanner for reading an image of a conveyed document has been exemplified as an image reading apparatus to which the present invention is applied. However, the present invention is not limited to this. For example, in an image recording apparatus such as a copying machine or a facsimile apparatus, even if the present invention is applied to a document image reading unit, the same effect as the above effect can be obtained.
【0036】[0036]
【発明の効果】以上説明したように、本発明によれば、
下記のような効果がある。 1.原稿の画像情報を密着センサに結像するレンズの被
写界深度等の光学性能を、低くすることができるので、
レンズ自体の生産性がよく、よって、生産性のよい装置
を提供できる。 2.被写界深度の浅いレンズを利用できるので、原稿を
照明する光源の光量が少なくて済み、生産性のよい光源
を選択できる。また、消費電力が少なくなると共に、発
生する熱も少ないので、放熱板や冷却ファン等も必要な
く、生産性のよい装置を提供できる。 3.ピントのズレが少ないもしくは全くなく、解像度良
く読み取ることができる。 4.厚さの厚い原稿も、搬送でき、ジャムも起こりにく
い。As described above, according to the present invention,
The following effects are obtained. 1. Since the optical performance such as the depth of field of the lens that forms the image information of the document on the contact sensor can be reduced,
The productivity of the lens itself is good, and a device with good productivity can be provided. 2. Since a lens with a small depth of field can be used, the light amount of the light source for illuminating the document can be reduced, and a light source with good productivity can be selected. In addition, since power consumption is reduced and heat generated is small, a heat-radiating plate, a cooling fan, and the like are not required, and a device with high productivity can be provided. 3. The image can be read with high resolution with little or no focus shift. 4. Thick originals can be conveyed, and jams are less likely to occur.
【図1】本発明の第1の実施の形態に係るスキャナの読
取部を表す横断面図。FIG. 1 is a cross-sectional view illustrating a reading unit of a scanner according to a first embodiment of the invention.
【図2】本発明の第2の実施の形態に係るスキャナの読
取部を表す横断面図。FIG. 2 is a cross-sectional view illustrating a reading unit of a scanner according to a second embodiment of the invention.
【図3】本発明の第3の実施の形態に係るスキャナの読
取部を表す横断面図。FIG. 3 is a cross-sectional view illustrating a reading unit of a scanner according to a third embodiment of the invention.
【図4】本発明の第4の実施の形態に係るスキャナの読
取部を表す横断面図。FIG. 4 is a cross-sectional view illustrating a reading unit of a scanner according to a fourth embodiment of the invention.
【図5】本発明に係るスキャナを表す横断面図。FIG. 5 is a cross-sectional view illustrating a scanner according to the invention.
【図6】従来例に係るスキャナの読取部を表す横断面
図。FIG. 6 is a cross-sectional view illustrating a reading unit of a scanner according to a conventional example.
7,60,80 裏面読取ユニット 13,70,90 表面読取ユニット 7f,13f,60f,70f,80f,90f レン
ズ S シート状原稿7, 60, 80 Back reading unit 13, 70, 90 Front reading unit 7f, 13f, 60f, 70f, 80f, 90f Lens S Sheet-shaped original
Claims (7)
式の画像読取手段を、シートを挟んでほぼ相対する位置
に2つ配置し、シートの表と裏の両面の画像をほぼ同時
に読み取る画像読取装置において、 前記2つの画像読取手段のうち、少なくとも一方の画像
読取手段と、その画像読取手段によって読み取られる画
像と、の距離が、いかなるシートを読み取る際にも常に
一定であることを特徴とする画像読取装置。An image reading means for reading an image of a sheet being conveyed is provided at two positions substantially opposite to each other across a sheet, and images on both sides of the sheet are read almost simultaneously. In the reading device, a distance between at least one of the two image reading units and an image read by the image reading unit is always constant when reading any sheet. Image reading device.
性部材を配置し、この光透過性部材にシートを密着させ
ることで、その画像読取手段と、シート上の画像との距
離を一定にすることを特徴とする請求項1に記載の画像
読取装置。2. A light transmissive member is arranged between the image reading means and the sheet, and the sheet is brought into close contact with the light transmissive member, so that the distance between the image reading means and the image on the sheet is reduced. 2. The image reading apparatus according to claim 1, wherein the image reading apparatus is fixed.
を、シートが前記光透過性部材に対して密着する向き
に、形成することを特徴とする請求項2に記載の画像読
取装置。3. The image reading apparatus according to claim 2, wherein a sheet conveyance path immediately before said image reading means is formed in a direction in which a sheet comes into close contact with said light transmitting member.
中に、シートを前記光透過性部材に対して押圧する押圧
手段を設けることを特徴とする請求項2または3に記載
の画像読取装置。4. An image reading apparatus according to claim 2, wherein a pressing means for pressing a sheet against said light transmitting member is provided in a sheet conveying path immediately before said image reading means. .
式の画像読取手段を、シートを挟んでほぼ相対する位置
に2つ配置し、シートの表と裏の両面の画像をほぼ同時
に読み取る画像読取装置において、 前記2つの画像読取手段の距離を可変とすることを特徴
とする画像読取装置。5. An image reading means for reading an image of a sheet being conveyed is provided at two positions substantially opposed to each other with the sheet interposed therebetween, and the images on both sides of the sheet are read almost simultaneously. An image reading apparatus, wherein a distance between the two image reading units is variable.
し、 他方の画像読取手段を、固定された画像読取手段に対し
付勢する付勢手段を設けることを特徴とする請求項5に
記載の画像読取装置。6. An image forming apparatus according to claim 5, wherein one of said two image reading means is fixed, and urging means for urging the other image reading means against the fixed image reading means is provided. The image reading device according to claim 1.
画像読取装置を備え、 その画像読取装置で読み取った画像を記録する画像記録
手段を有する画像記録装置。7. An image recording apparatus comprising: the image reading apparatus according to claim 1; and an image recording means for recording an image read by the image reading apparatus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35911396A JP3524311B2 (en) | 1996-12-27 | 1996-12-27 | Image reading device and image recording device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35911396A JP3524311B2 (en) | 1996-12-27 | 1996-12-27 | Image reading device and image recording device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10190938A true JPH10190938A (en) | 1998-07-21 |
JP3524311B2 JP3524311B2 (en) | 2004-05-10 |
Family
ID=18462812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP35911396A Expired - Fee Related JP3524311B2 (en) | 1996-12-27 | 1996-12-27 | Image reading device and image recording device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3524311B2 (en) |
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US5617836A (en) * | 1995-10-04 | 1997-04-08 | Ford Motor Company | Engine control system for producing and responding to an index of maturity of adaptive learing |
KR100435015B1 (en) * | 2000-12-28 | 2004-06-09 | 캐논 가부시끼가이샤 | Duplex image reading apparatus |
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US5617836A (en) * | 1995-10-04 | 1997-04-08 | Ford Motor Company | Engine control system for producing and responding to an index of maturity of adaptive learing |
KR100435015B1 (en) * | 2000-12-28 | 2004-06-09 | 캐논 가부시끼가이샤 | Duplex image reading apparatus |
US7110148B2 (en) | 2000-12-28 | 2006-09-19 | Canon Kabushiki Kaisha | Duplex image reading apparatus |
US7916357B2 (en) | 2004-05-13 | 2011-03-29 | Canon Denshi Kabushiki Kaisha | Image reading apparatus |
US8570611B2 (en) | 2006-03-22 | 2013-10-29 | Canon Denshi Kabushiki Kaisha | Image reading apparatus, shading correction method therefor, and program for implementing the method |
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