JPH0332155A - Original reader - Google Patents

Original reader

Info

Publication number
JPH0332155A
JPH0332155A JP1167915A JP16791589A JPH0332155A JP H0332155 A JPH0332155 A JP H0332155A JP 1167915 A JP1167915 A JP 1167915A JP 16791589 A JP16791589 A JP 16791589A JP H0332155 A JPH0332155 A JP H0332155A
Authority
JP
Japan
Prior art keywords
original
reading
document
light
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.)
Pending
Application number
JP1167915A
Other languages
Japanese (ja)
Inventor
Hiroshi Ogushi
博 大櫛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP1167915A priority Critical patent/JPH0332155A/en
Publication of JPH0332155A publication Critical patent/JPH0332155A/en
Pending legal-status Critical Current

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  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To improve the read start accuracy and to obtain a reader possible for miniaturization by containing an original end sensing means to one member of an original read unit. CONSTITUTION:When an original 1 is carried, a light passing through an optical path 7 is reflected at the tip of an original and reaches a photodetector section 5 of a position S1 to detect the tip of the original and the light through an optical path 8 is read as an original image at a read section at a position S2. Then the reading is stopped after a prescribed time when the absence of the reflected light on the original face from the light path 7 is detected. Thus, it is possible to arrange an original tip sensing means and a picture read means close to each other and the positions S1, S2 are placed onto a member 61 being an integrated member, then the read accuracy is high and error is less and since the light source is used in common, number of components is reduced and then the necessity of replacement of defective components is less.

Description

【発明の詳細な説明】[Detailed description of the invention]

[産業上の利用分野] 本発明は原稿像を読取る装置C関し、特に装置における
読取制度の向上及び小型化を可能とするもので、原稿に
近接した読取部材により原稿を読取るものである。 [従来の技術] 第7図は従来の原稿読取装置を例示するものであり、読
取装置の読取ユニット6はアルミニウムの引出材による
一体の筐体61に、蛍光灯等の光源ランプ4.筐体に取
付けられたランプ4の反射板を兼ねたホルダ62、そし
て受光部5が取付けである。この受光部は従来の密着形
センサーとして知られているものを用いている。一方そ
の上部には上カバー20が覆っていて、上記ユニット6
の上流には、搬送されてきた複数の原稿を分離するため
にあって軸23aを中心に時計方向c付勢された分離片
23と、本体装置に取付けられ時計方向に回転するロー
ラ22を有する。またその下流側には原稿lの先端を検
知する反射型フォトセンサによる原稿先端検知部材であ
るセンサ24がある。そしてカバー20を反時計方向2
5に軸21を中心に回転して開くと、上記分離片23と
検知部材24とともに、原稿を搬送するためのゴム製の
プラテンローラ2が、このカバーとともに一体に移動し
、原稿lの搬送路を開放する。 なお1図中26は上記カバー20側に一体に取付けられ
た原稿案内用のガイド板を示す。 上記構成において原稿の読取りは、原稿lの先端がセン
サ24により検知されると、原稿がそこから20讃■移
動したことを見こして、受光部5が原稿の読取り動作を
開始する。 読取りユニット6による読み取りは、ランプ4から出た
光が原稿面を照射し、原稿からの反射光像を受光部で光
電変換して行なう。 [発明が解決しようとしている課題] 上記構成においては、原稿の先端を検知するセンサ24
が、原稿を読取るための受光部6と別部材に取付けられ
ている。このため原稿の読取開始のタイミングを決定す
るのに、センサ24の取付は位置や読み取りユニット6
の取付は位置の制度が大きく影響していた。よって本体
にこの様な読取り装置を実装するには各部品の精度を上
げたり、めんどうな調整をしなければならなかった。 [問題を解決するための手段] 本発明の目的は上記従来の周期を解決し、小型化可能で
装置本体に対して容易に取付は可能なユニット化された
読取り装置を提供するものである。 また、他の目的は読取り開始精度を向上し、且つ、小型
化可能な読取り装置を提供するものである。 上記目的を達成する本発明の読取り装置は、ローラ等の
無端移動する原稿搬送部材と、原稿搬送路を介して位置
し、原稿の画像側を案内する筐体と、この筐体に取付け
られた原稿読取り部材と、原稿の移動方向に見て上記読
取り部材の上流の上記筐体に設けた原稿検知部材とを有
するものである。
[Industrial Application Field] The present invention relates to an apparatus C for reading an original image, and in particular, it is an apparatus that can improve the reading accuracy and downsize the apparatus, and reads the original using a reading member that is close to the original. [Prior Art] FIG. 7 shows an example of a conventional document reading device, in which a reading unit 6 of the reading device is housed in an integral housing 61 made of aluminum drawer material, and has a light source lamp 4, such as a fluorescent lamp. The holder 62, which also serves as a reflector for the lamp 4 attached to the housing, and the light receiving section 5 are attached. This light receiving section uses what is known as a conventional contact type sensor. On the other hand, an upper cover 20 covers the upper part of the unit 6.
Upstream of the main unit, there is a separation piece 23 for separating a plurality of conveyed originals and biased in a clockwise direction c around a shaft 23a, and a roller 22 attached to the main unit and rotating in a clockwise direction. . Further, on the downstream side thereof, there is a sensor 24 which is a document leading edge detection member using a reflective photosensor that detects the leading edge of the document l. Then turn the cover 20 counterclockwise 2
When the cover is rotated around the shaft 21 and opened, the rubber platen roller 2 for conveying the original moves together with the separating piece 23 and the detection member 24, and the cover moves along the conveying path of the original l. to open. Note that 26 in FIG. 1 indicates a guide plate for guiding the document, which is integrally attached to the cover 20 side. In the above configuration, when the leading edge of the original l is detected by the sensor 24, the light receiving section 5 starts reading the original, assuming that the original has moved 20 cm from there. Reading by the reading unit 6 is performed by irradiating the surface of the original with light emitted from the lamp 4 and photoelectrically converting the reflected light image from the original at the light receiving section. [Problems to be Solved by the Invention] In the above configuration, the sensor 24 that detects the leading edge of the document
is attached to a separate member from the light receiving section 6 for reading the original. Therefore, in order to determine the timing to start reading the original, the mounting position of the sensor 24 and the position of the reading unit 6 are determined.
The installation of was greatly influenced by the position system. Therefore, in order to mount such a reading device on the main body, it was necessary to increase the precision of each component and make troublesome adjustments. [Means for Solving the Problems] An object of the present invention is to solve the above-mentioned conventional cycle and provide a unitized reading device that can be downsized and easily attached to the main body of the device. Another object of the present invention is to provide a reading device that improves reading start accuracy and can be downsized. A reading device of the present invention that achieves the above object includes an endlessly movable document conveyance member such as a roller, a casing positioned through a document conveyance path and guiding the image side of the document, and a casing attached to the casing. The apparatus includes a document reading member and a document detecting member provided in the housing upstream of the reading member when viewed in the direction of movement of the document.

【実施例】【Example】

第1図と第2図は本発明の一実施例を示すもので、図に
おいて読取りユニットAは図の如く継ぎ目のない構造体
6内にCOD等の読み取り素子として機能する受光部5
を有し、更に筐体6に取付けたランプ4を有す、この構
造体6は図の上面が原稿として機能するガイド板部材6
1の他に、反射板を兼ねたホルダ62とともにランプ4
を有している。 上記受光部5は部材61に設けた凹部63の底部に配設
され、この受光部5の上部を構成する凹部63は保護ガ
ラス3によって覆われている。このガラス3上には、こ
のガラス3に接する白色プラテンローラ2が設けられ、
原稿lの背景を構成する。原稿はこのローラ2が原稿を
ガラス3に押付けた状態で反時計方向に回転することで
、ガラス3表面を搬送されてゆく。 また、構造体6の部材61には、ランプ4からの光を原
稿面に導くための光路7.8を形成するための穴9.1
0が、原稿の移動方向と直交する原稿の走査方向に並べ
て形威しである。 穴10は原稿像の読取り用であり、その上流側の穴9は
原稿の先端を検知するためのものである。またローラ2
の前後の原稿1のガイド板26aは第7図の如く一端を
中心として鎖線の如く開放可能にしても良い。 2つの穴9.lOによる光路7,8を通った光は、原稿
に反射してから受光部5に至る。この受光部5は部位S
lとS2に分けており、その距離は3■鵬に設定しであ
る。上記部位slが原稿の先端検知用として、一方部位
S2は原稿読取り用として用いられる。また、上記構成
においては、単一のランプを先端検知用と読取り用に併
用している。 第8図は上記受光部5の部分拡大図で、ガラス基板51
上にはランプ4からの直接の光を遮断するためのクロム
(Cr)による下電極兼遮光層52と、Sin、による
絶縁層53と、原稿の反射光を受けるためのアモルファ
スシリコン(A−Si)による光半導体層54、アルミ
ニウム(All)による上電極層55を構成される。そ
して更にその上には、ボリイくドによる保護層56と2
原稿lの案内面を兼ねる保護ガラス3がある。また穴9
の受光部5側には、不要な光が受光部に至るのを阻止す
るための遮光層58が設けである。 上記受光部の作動について以下述べる。 原稿1が搬送されてくると、上記光路7を通った光が原
稿の先端で反射し1部位S1の受光部に至って原稿の先
端を検知する。そして所定の時間後、部位S2による読
取り部で光路8を通った光を、原稿像として読取りを開
始する。そして、原稿面による反射光がなくなったこと
を光路7により検知してから、所定時間後に読取り動作
を停止する。 このように構成することにより、従来のように原稿先端
検知手段と画像読取り用手段とを別体に設けた場合に比
べ、約17−鵬程度も両者を近づけて配設することが可
能となった。また上記m位S、・S2がアルくニウムに
よる一枚板による一体物で作った部材61に取付けであ
るため、読取り精度が高くて誤差が少なく、よって原稿
の先端を欠落して読んだり、逆に原稿が来るまえに読取
り開始してしまうことがなくなった。このことは原稿の
後端における読取り精度の向上についても同様の効果を
生じる。更に上記実施例では光源を共用しているため部
位点数の低減効果、及びこれにより故障ケ所や部品の交
換の必要性を少なくすることが可能となった。 第3図及び第4図は他の実施例を示すもので1図中カリ
ウムヒ素赤外発光体のLED素子等の光Jiltは、フ
ォトトランジスタを用いた受光部12専用の光源で、上
記部位S2と同様の原稿読取り手段とともに、上記同様
の部材61に取付けである。この場合1両受光部間の距
離は約10−■程度離れて位置している。 前記構成において、原稿が送られてくると、原稿端感知
ユニットの光源11から出た光が光路13を通って専用
の受光部12に受けられ原稿先端を感知し、一定の時間
的間隔をおいて前記実施例と同様(光路8により読み取
りを開始する。その後、同じ原稿端感知ユニットで後端
を感知し、一定の時間的間隔をおいて読み取りを停止す
る。 第5図と第6図は第3の実施例で上記実施例と異なる点
は、原稿端検知用の受光部と原稿読取用の受光部を同−
成膜上に形成して、いわば受光部を共用していることで
ある。また原稿搬送手段にはローラに変えてゴムベルト
30とこのベルトを支持するコロ31を用いている。 前記構成において、GaAs赤外発光 LEDを用いた原稿端感知用光源14から出た光が原稿
が送られてくると反射され、この反射光が光路15を通
って受光部5で感知される。 その後、一定の時間的間隔をおいて、前記実施例と同様
に光路8により読み取りを開始する。 その後同じ感知手段で後端を感知し、一定の時間的間隔
をおいて読み取りを停止する。 第9図と第1O図は第4の実施例で、第2図の実施例の
原稿搬送用のプラテンローラ2の原稿先端検知部材に対
応する位置に凹部32を設けた。このローラ2aの周方
向全周に設けた凹部により、上記部位S1とS、とを近
づけることで、先のローラ2の白色面と原稿面の白とを
誤って判断することが防止できた。 これによると第1の実施例の部位S1と81とを1〜2
鵬鵬程度にも近づけることが可能にな)た、これにより
上述した効果を更に高めることが可能になった。 第111Jは上記プラテンローラ2の更なる変形例で、
第9図のローラ2aに設けた凹部32に変えて、ローラ
の周面な先端検知手段に対応する位置を着色したもので
ある。この着色は黒以外にも、受光素子に色感度により
黄色等の任意の色を選ぶことが可能となる。 これによってもNl19図の実施例と同様の結果を得る
ことが可能となった。 なお、上記実施例において原稿の画像側を案内し、且つ
受光部を設ける一体物の案内部材としては、上記の如き
一枚のアルミニウムの板を切削して形成した一体物の他
に1合成樹脂による一体物であっても良い、ま゛た、受
光部材には成膜による上記例のものに変えて、別に形成
した従来の読み取り用素子を一体物による部材に固設し
て形成しても良い、更に光源については、LEDや蛍光
灯以外にも、受光部材の材料に合せて従来の光源を選択
して用いることができる、また、ローラ等の搬送部材と
案内部材の押圧関係についてはどちらを固定しても良い
。 [発明の効果] 以上のようにこの発明によれば、原稿の読み取りユニッ
トの一つの部材に原稿端感知手段を収納し、これにより
原稿端感知位置と原稿読み取り位置を従来より近くに配
置することができるので、紙の厚み、摩擦係数、環境等
が異なっても読取り開始および終了位置の誤差を小さく
することができる。
FIGS. 1 and 2 show an embodiment of the present invention. In the figures, a reading unit A is a light receiving part 5 which functions as a reading element for COD etc. in a seamless structure 6 as shown in the figure.
This structure 6 has a guide plate member 6 whose upper surface serves as a manuscript.
1, the lamp 4 together with the holder 62 which also serves as a reflector.
have. The light receiving section 5 is disposed at the bottom of a recess 63 provided in the member 61, and the recess 63 forming the upper part of the light receiving section 5 is covered with the protective glass 3. A white platen roller 2 is provided on this glass 3 and is in contact with this glass 3.
Configure the background of manuscript l. The document is conveyed on the surface of the glass 3 as the roller 2 rotates counterclockwise while pressing the document against the glass 3. Further, in the member 61 of the structure 6, there are holes 9.1 for forming an optical path 7.8 for guiding the light from the lamp 4 to the document surface.
0 is arranged in the scanning direction of the original, which is orthogonal to the moving direction of the original. The hole 10 is for reading the original image, and the hole 9 on the upstream side thereof is for detecting the leading edge of the original. Also roller 2
The guide plates 26a for the front and rear originals 1 may be made openable as shown by chain lines around one end as shown in FIG. Two holes9. The light that passes through the optical paths 7 and 8 due to lO reaches the light receiving section 5 after being reflected on the original. This light receiving part 5 is a part S
It is divided into 1 and S2, and the distance between them is set to 3cm. The portion sl is used for detecting the leading edge of the document, while the portion S2 is used for reading the document. Further, in the above configuration, a single lamp is used for both tip detection and reading. FIG. 8 is a partially enlarged view of the light receiving section 5, and shows the glass substrate 51.
On top are a lower electrode and light shielding layer 52 made of chromium (Cr) for blocking direct light from the lamp 4, an insulating layer 53 made of Sin, and an amorphous silicon (A-Si) layer 53 for receiving reflected light from the original. ) and an upper electrode layer 55 made of aluminum (All). Furthermore, on top of that, a protective layer 56 and 2
There is a protective glass 3 that also serves as a guide surface for the original l. Also hole 9
A light-shielding layer 58 is provided on the light-receiving section 5 side to prevent unnecessary light from reaching the light-receiving section. The operation of the light receiving section will be described below. When the original 1 is conveyed, the light passing through the optical path 7 is reflected at the leading edge of the original and reaches the light receiving section 1 S1 to detect the leading edge of the original. Then, after a predetermined period of time, the reading unit using the portion S2 starts reading the light that has passed through the optical path 8 as a document image. The reading operation is then stopped after a predetermined time has elapsed after the optical path 7 detects that the reflected light from the document surface is no longer present. With this configuration, compared to the conventional case where the document leading edge detection means and the image reading means are provided separately, it is possible to arrange them approximately 17 mm closer to each other. Ta. In addition, since the above-mentioned positions S and S2 are attached to the member 61 made of a single piece of aluminum, the reading accuracy is high and there are few errors. On the other hand, I no longer have to start reading the document before it arrives. This has the same effect on improving the reading accuracy at the trailing edge of the document. Furthermore, in the above embodiment, since the light source is shared, it is possible to reduce the number of parts, and thereby to reduce the need to replace malfunctioning parts and parts. 3 and 4 show other embodiments. In FIG. 1, the light Jilt, such as an LED element of a potassium arsenic infrared emitter, is a light source dedicated to the light receiving section 12 using a phototransistor, and the above-mentioned portion S2 It is attached to the same member 61 as described above together with a document reading means similar to the above. In this case, the distance between the two light receiving sections is about 10 mm. In the above configuration, when a document is sent, the light emitted from the light source 11 of the document edge detection unit passes through the optical path 13 and is received by the dedicated light receiving section 12, which detects the leading edge of the document, and then detects the document edge at regular intervals. Similarly to the above embodiment (reading is started using the optical path 8. After that, the trailing edge is detected by the same document edge sensing unit, and reading is stopped at a certain time interval. FIGS. 5 and 6 The difference between the third embodiment and the above embodiment is that the light receiving section for document edge detection and the light receiving section for document reading are the same.
It is formed on a film, so to speak, so that the light receiving part is shared. Further, instead of rollers, a rubber belt 30 and rollers 31 that support the belt are used as the document conveyance means. In the above configuration, light emitted from the document edge sensing light source 14 using a GaAs infrared LED is reflected when the document is sent, and this reflected light passes through the optical path 15 and is sensed by the light receiving section 5. Thereafter, at a certain time interval, reading is started using the optical path 8 in the same manner as in the previous embodiment. Thereafter, the same sensing means senses the trailing edge, and reading is stopped at a fixed time interval. 9 and 10 show a fourth embodiment, in which a recess 32 is provided at a position corresponding to the document leading edge detection member of the platen roller 2 for conveying the document in the embodiment shown in FIG. By bringing the above-mentioned portions S1 and S closer to each other by the recesses provided all around the circumferential direction of the roller 2a, it was possible to prevent erroneously determining the white surface of the previous roller 2 and the white surface of the document. According to this, the parts S1 and 81 of the first embodiment are 1 to 2
It has become possible to approach the level of Peng Peng), which has made it possible to further enhance the above-mentioned effects. No. 111J is a further modified example of the platen roller 2,
In place of the recessed portion 32 provided in the roller 2a in FIG. 9, the position corresponding to the tip detection means on the circumferential surface of the roller is colored. For this coloring, it is possible to select any color other than black, such as yellow, depending on the color sensitivity of the light receiving element. This also made it possible to obtain the same results as in the example shown in Figure Nl19. In addition, in the above embodiment, the integral guide member that guides the image side of the document and provides the light receiving section is made of synthetic resin in addition to the integral body formed by cutting a single aluminum plate as described above. Alternatively, instead of forming a film on the light-receiving member in the above example, a separately formed conventional reading element may be fixed to the integrated member. Good. Furthermore, regarding the light source, in addition to LEDs and fluorescent lights, conventional light sources can be selected and used according to the material of the light receiving member. Also, regarding the pressure relationship between the conveying member such as a roller and the guide member, may be fixed. [Effects of the Invention] As described above, according to the present invention, the document edge sensing means is housed in one member of the document reading unit, and thereby the document edge sensing position and the document reading position are arranged closer than before. Therefore, even if the paper thickness, friction coefficient, environment, etc. differ, errors in the reading start and end positions can be reduced.

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

第1図はこの発明の一実施例に係る画像読取走査装置の
要部拡大断面図、第2図は第1図の装置の読取ユニット
の縦断面図、第3図は第2実施例の装置の読取ユニット
の縦断面図、第4図は第3図の画像読取位置付近の拡大
図、第5図はこの発明の第3実施例の装置の読取ユニッ
トの縦断面図、第6図は第5図の画像読取位置付近の拡
大図、第7図は従来例における画像読取装置の縦断面図
、第8図は実施例1における読取ユニットの受光部拡大
断面図、第9図は実施例4における画像読取部の斜視図
、第1O図は実施例4における画像読取部の縦断面図、
第11図は実施例5仁おける画像読取部の斜視図を示す
。 1−・・原稿 2・・・読取白色プラテンローラ 3・・・保護ガラス 4・・・光源 5・・・受光部 6・・・ベース 7・・・原稿端感知用の光路 8・・・画像読取用の光路
FIG. 1 is an enlarged sectional view of essential parts of an image reading and scanning device according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of a reading unit of the device of FIG. 1, and FIG. 3 is a device of a second embodiment. 4 is an enlarged view of the vicinity of the image reading position in FIG. 3, FIG. 5 is a longitudinal sectional view of the reading unit of the apparatus according to the third embodiment of the present invention, and FIG. 5 is an enlarged view of the vicinity of the image reading position, FIG. 7 is a vertical sectional view of the conventional image reading device, FIG. 8 is an enlarged sectional view of the light receiving part of the reading unit in Embodiment 1, and FIG. 9 is Embodiment 4. FIG. 1O is a vertical cross-sectional view of the image reading section in Embodiment 4,
FIG. 11 shows a perspective view of the image reading section in the fifth embodiment. 1-... Original 2... Reading white platen roller 3... Protective glass 4... Light source 5... Light receiving unit 6... Base 7... Optical path for document edge detection 8... Image Optical path for reading

Claims (1)

【特許請求の範囲】 原稿を照明し、原稿からの画像光を光電変 換して読取る読取手段と、 原稿端を検知する検知手段と、を有する原 稿読取装置において、 上記読取手段を支持する支持部材を有し、 上記検知手段が上記支持部材に設けられることを特徴と
する原稿読取装置。
[Scope of Claims] A document reading device comprising a reading device that illuminates a document and photoelectrically converts and reads image light from the document, and a detection device that detects an edge of the document, a support member that supports the reading device. A document reading device comprising: the detection means provided on the support member.
JP1167915A 1989-06-28 1989-06-28 Original reader Pending JPH0332155A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1167915A JPH0332155A (en) 1989-06-28 1989-06-28 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1167915A JPH0332155A (en) 1989-06-28 1989-06-28 Original reader

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP7307286A Division JPH08214108A (en) 1995-11-27 1995-11-27 Original reader

Publications (1)

Publication Number Publication Date
JPH0332155A true JPH0332155A (en) 1991-02-12

Family

ID=15858411

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1167915A Pending JPH0332155A (en) 1989-06-28 1989-06-28 Original reader

Country Status (1)

Country Link
JP (1) JPH0332155A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61140441A (en) * 1984-12-14 1986-06-27 Canon Inc Document detecting mechanism
JPS6316748B2 (en) * 1980-12-30 1988-04-11 Intaanashonaru Bijinesu Mashiinzu Corp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316748B2 (en) * 1980-12-30 1988-04-11 Intaanashonaru Bijinesu Mashiinzu Corp
JPS61140441A (en) * 1984-12-14 1986-06-27 Canon Inc Document detecting mechanism

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