JPH0220958A - Double-sided read type image input device - Google Patents

Double-sided read type image input device

Info

Publication number
JPH0220958A
JPH0220958A JP17142088A JP17142088A JPH0220958A JP H0220958 A JPH0220958 A JP H0220958A JP 17142088 A JP17142088 A JP 17142088A JP 17142088 A JP17142088 A JP 17142088A JP H0220958 A JPH0220958 A JP H0220958A
Authority
JP
Japan
Prior art keywords
document
read
holding plate
optical path
image sensor
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
JP17142088A
Other languages
Japanese (ja)
Inventor
Kuniyoshi Adachi
安達 邦佳
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.)
PFU Ltd
Original Assignee
PFU Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PFU Ltd filed Critical PFU Ltd
Priority to JP17142088A priority Critical patent/JPH0220958A/en
Publication of JPH0220958A publication Critical patent/JPH0220958A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain an image input device of a double-sided simultaneous read type which is small in size and inexpensive by providing a second optical path which faces the other surface of an original passage of an automatic read unit. CONSTITUTION:By placing mirrors 38, 39 on both ends of a slit 37 running along the plate surface of an original cover 4, the surface and the reverse side of a document which passes through the inside of an automatic read unit 2 can be read by image forming lenses 8, 40 and image sensors 9, 41 arranged in a device enclosure 1, and read optical paths L1, L2 of the surface and the reverse side can both be lengthened enough. Also, since the image forming lens 40 and the image sensor 41 are arranged in the enclosure the automatic read unit 2 can be made small, and the optical path L2 connected to the one- dimensional image sensor 41 is flat and can be formed flatly along the original cover 4. In such a way, the original cover 4 does not become excessive, and double-sided read can be executed by the device dimension being equal to a device of a single face read type.

Description

【発明の詳細な説明】 〈産業上の利用分野) この発明は、イメージ情報を光電変換素子を介して読み
取るイメージ入力装置に関するもので、透明原稿台と原
稿押さえ板との間に原稿を挟持して読み取るフラットベ
ッド型の固定読み取り部と、自動給紙される原稿を移送
しながら読み取る自動読み取り部とを備えたイメージ入
力装置における自動読み取り部での両面同時読み取りを
実現する手段に関するものである。
[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an image input device that reads image information through a photoelectric conversion element, in which a document is held between a transparent document table and a document holding plate. The present invention relates to a means for realizing simultaneous double-sided reading in an automatic reading section in an image input device including a flatbed type fixed reading section that reads an automatically fed document while being transported, and an automatic reading section that reads an automatically fed document while being transported.

(従来の技術) 第6図は、フラットベッド型の固定読み取り部Aと自動
給紙機構を有する自動読み取り部Bとを備えた従来のイ
メージ入力装置の一例を示したもので、1は装置の筐体
、2は自動読み取りユニット、3は透明原稿台、4は自
動読み取りユニット2と一体の原稿押さえ板であり、ピ
ン5で装置筺体1に開閉自在に枢着されている。6は透
明原稿台3に沿って走行する第1キヤリア、7は第1キ
ヤリアと同方向に2分の1の速度で走行する第2キヤリ
ア、8は結像レンズ、9は一次元イメージセンサである
。透明原稿台3上の原稿のイメージ情報は、キャリア6
.7を走行させることにより、第1キヤリア6に搭載し
た光源ランプ10で照明され、第1キヤリアのミラー1
1及び第2キヤリアのミラー12.13で形成した筺体
1内の光路り、を通ってイメージセンサ9上に結像し、
電気信号として読み取られる。
(Prior Art) FIG. 6 shows an example of a conventional image input device equipped with a flatbed type fixed reading section A and an automatic reading section B having an automatic paper feeding mechanism. The housing includes an automatic reading unit 2, a transparent document table 3, and a document holding plate 4 integrated with the automatic reading unit 2, which is pivotally connected to the device housing 1 with pins 5 so as to be openable and closable. 6 is a first carrier that runs along the transparent document table 3; 7 is a second carrier that runs in the same direction as the first carrier at half the speed; 8 is an imaging lens; and 9 is a one-dimensional image sensor. be. The image information of the document on the transparent document table 3 is transferred to the carrier 6.
.. 7, the mirror 1 of the first carrier 6 is illuminated by the light source lamp 10 mounted on the first carrier 6.
passes through an optical path inside the housing 1 formed by mirrors 12 and 13 of the first and second carriers, and forms an image on the image sensor 9;
It is read as an electrical signal.

一方、21は自動読み取りユニット2に設けたフィード
台、22はフィード台上の原稿、23は給紙ローラ、2
4は送りローラ、25は排紙ローラ、26はスタッカ、
27は送りローラ24と排紙ローラ25の間の原稿通路
に置かれた読み取り窓であり、自動読み取り時には、前
記第1キヤリア6を読み取り窓27の直下に位置させ、
給紙ローラ23で自動読み取りユニット2内にフィード
台上の原稿22を順に送り込み、該原稿を送りローラ2
4と排紙ローラ25とで挟んで移送しながら読み取って
ゆく。
On the other hand, 21 is a feed table provided in the automatic reading unit 2, 22 is a document on the feed table, 23 is a paper feed roller, 2
4 is a feed roller, 25 is a paper ejection roller, 26 is a stacker,
27 is a reading window placed in the document path between the feed roller 24 and the paper ejection roller 25; during automatic reading, the first carrier 6 is positioned directly below the reading window 27;
The document 22 on the feed stand is sequentially fed into the automatic reading unit 2 by the paper feed roller 23, and the document is transferred to the feed roller 2.
4 and the paper discharge roller 25, and the paper is read while being conveyed.

(発明が解決しようとする課題) 前記装置において、ミラー11.12.13、結像レン
ズ8及びイメージセンサ9で形成される第1の光学系1
4のほかに、原稿通路28の上側に臨む第2の光学系を
設けてやれば、自動読み取すユニット2での両面同時読
み取りを実現することが可能である。
(Problems to be Solved by the Invention) In the above device, a first optical system 1 formed of a mirror 11, 12, 13, an imaging lens 8, and an image sensor 9.
4, if a second optical system facing the upper side of the document path 28 is provided, simultaneous reading of both sides by the automatic reading unit 2 can be realized.

この第2の光学系は、密着型のイメージセンサを用いる
と簡単に形成できるが、センサやレンズが非常に高価で
あるという問題がある。一方、この第2の光学系を通常
のイメージセンサを用いて構成しようとすると、第7図
に示すように、多数のミラー30・・・を用いて光路L
2を屈折させてやらなければ必要な光路長を確保できず
、そのために自動読み取りユニット2が大きくなり、内
部構造も複雑になって装置コストを上昇させるという問
題が生ずる。結像レンズとして短焦点のものを用いれば
光路長をある程度短くできるが、そうすると、解像度が
低下したり、焦点深度が浅いために原稿の折り目等によ
る僅かな光路長の変化でピンボケが起こる欠点がある。
This second optical system can be easily formed using a contact type image sensor, but there is a problem that the sensor and lens are very expensive. On the other hand, if this second optical system is constructed using a normal image sensor, as shown in FIG.
2 must be refracted to ensure the necessary optical path length, which results in the problem that the automatic reading unit 2 becomes large and its internal structure becomes complicated, increasing the cost of the device. The optical path length can be shortened to some extent by using a short-focus imaging lens, but this has the disadvantage that the resolution decreases and the depth of focus is shallow, resulting in blurring due to slight changes in the optical path length due to folds in the document, etc. be.

この発明は、上記問題を解決して、小型で安価な両面同
時読み取り型のイメージ入力装置を実現する技術手段を
得ることを課題としている。
An object of the present invention is to solve the above-mentioned problems and provide technical means for realizing a small and inexpensive double-sided simultaneous reading type image input device.

(課題を解決するための手段) この発明では、自動読み取りユニット2を通過する原稿
22の裏面を読み取るための第2の光学系29の光路L
2を原稿押さえ板4の内部ないしはその上面に沿って形
成することにより、第2の光学系29の光路長を確保し
たもので、フラットベッド型の原稿台3とこの原稿台に
覆着される原稿押さえ板4とこの原稿押さえ板の側部に
配置された自動読み取りユニット2とを備え、たイメー
ジ入力装置において、自動読み取りユニット2内を通過
する原稿の裏面に臨む光路L2を原稿押さえ板4の内部
又は上方にその板面に沿って形成し、該光路L2の他端
に結像レンズ40と一次元イメージセンサ41とを配置
したものである。
(Means for Solving the Problems) In the present invention, the optical path L of the second optical system 29 for reading the back side of the original 22 passing through the automatic reading unit 2 is
The optical path length of the second optical system 29 is ensured by forming 2 inside or along the upper surface of the document holding plate 4, and it is covered with the flatbed type document table 3 and this document table. In an image input device comprising a document holding plate 4 and an automatic reading unit 2 disposed on the side of the document holding plate, the optical path L2 facing the back side of the document passing through the automatic reading unit 2 is connected to the document holding plate 4. The imaging lens 40 and the one-dimensional image sensor 41 are arranged at the other end of the optical path L2.

(作用) 上記構成によれば、原稿押さえ板4の板面に沿うスリッ
ト37の両端にミラー38.39を配置することにより
、自動読み取りユニット2内を通過する原稿の表面及び
裏面を装置筺体1内に配置した結像レンズ8.40とイ
メージセンサ9.41で読み取ることができ、表面及び
裏面の読み取り光路L+、Lzを共に充分に長くするこ
とができる。
(Function) According to the above configuration, by arranging the mirrors 38 and 39 at both ends of the slit 37 along the plate surface of the document holding plate 4, the front and back surfaces of the document passing through the automatic reading unit 2 are exposed to the device housing 1. It can be read by an imaging lens 8.40 and an image sensor 9.41 arranged inside, and both the reading optical paths L+ and Lz on the front and back sides can be made sufficiently long.

そして、結像レンズ40及びイメージセンサ41が筐体
内に配置できるので、自動読み取りユニット2を小さく
でき、一次元イメージセンサ41に連なる光路L2は偏
平で原稿押さえ板4に沿ってフラットに形成できるので
、原稿押さえ板4が過大になることもなく、従来の片面
読み取り型の装置と同等の装置寸法で両面読み取りが実
現できる。
Since the imaging lens 40 and the image sensor 41 can be placed inside the housing, the automatic reading unit 2 can be made smaller, and the optical path L2 connected to the one-dimensional image sensor 41 can be flat and flat along the document holding plate 4. The document holding plate 4 does not become too large, and double-sided reading can be achieved with the same device dimensions as conventional single-sided reading devices.

(実施例) 第1図ないし第3図は本発明のfit実施例を示したも
ので、第1図は装置の断面図、第2図は全体斜視図、第
3図は原稿押さえ板を開放して示す装置の側面図である
。図において、従来例で説明した部材と同一の部材には
同じ符号を付してその説明を省略する。原稿押さえ板4
は、原稿台3に覆着される底板32と、該底板と平行に
架設された平面台形の上板33とで形成されており、両
板32.33の間に形成された偏平な空所34はスタッ
ク部となる。35は給紙ローラ23と送りローラ24と
の間の原稿通路28の下側に置かれた読み取り窓、36
は読み取り窓35に接近させて配置された光源ランプ、
37は原稿押さえ板の上板33内に形成されたスリット
、38.39はスリット37の両端に配置されたミラー
、40は筺体1内に設けられた結像レンズ、41は一次
元イメージセンサである。読み取り窓35上の原稿のイ
メージ情報は、光源ランプ36で照明され、ミラー38
.39、結像レンズ40およびイメージセンサ41に至
る第2の光路L2で読み取られる。
(Example) Figures 1 to 3 show a fit embodiment of the present invention. Figure 1 is a sectional view of the device, Figure 2 is a perspective view of the entire device, and Figure 3 is an open document holding plate. FIG. In the drawings, the same members as those described in the conventional example are given the same reference numerals, and the explanation thereof will be omitted. Original holding plate 4
is formed by a bottom plate 32 covered with the document table 3 and a flat trapezoidal top plate 33 installed parallel to the bottom plate, and a flat space formed between the two plates 32 and 33. 34 is a stack section. 35 is a reading window placed below the document path 28 between the paper feed roller 23 and the feed roller 24;
is a light source lamp placed close to the reading window 35;
37 is a slit formed in the upper plate 33 of the document holding plate, 38 and 39 are mirrors arranged at both ends of the slit 37, 40 is an imaging lens provided in the housing 1, and 41 is a one-dimensional image sensor. be. The image information of the document on the reading window 35 is illuminated by a light source lamp 36, and the image information is displayed by a mirror 38.
.. 39, the image is read on the second optical path L2 leading to the imaging lens 40 and the image sensor 41.

本実施例における自動読み取りユニット2の用紙通路2
8は、全体として横U字形をしており、フィード台21
に載置された原稿22は、給紙ローラ23で読み取り窓
35上に給送されて原稿の裏面のイメージ情報が第2の
光学系29で読み取られる。原稿22は更に送りローラ
24により反転させられて読み取り窓27上に給送され
、原稿の表面のイメージ情報が第1の光学系14で読み
取られた後、原稿押さえ板のスタック部34に排出され
る。42はスタック部34の前縁に突設された突条で、
両面読み取りが完了した原稿が既にスタック部34に収
容されている原稿と衝突するのを避けて原稿が順次積重
されるようにするために設けられたものである。
Paper path 2 of automatic reading unit 2 in this embodiment
8 has a horizontal U-shape as a whole, and the feed stage 21
The document 22 placed on the paper is fed onto the reading window 35 by the paper feed roller 23, and the image information on the back side of the document is read by the second optical system 29. The document 22 is further reversed by the feed roller 24 and fed onto the reading window 27, and after the image information on the surface of the document is read by the first optical system 14, it is discharged to the stack section 34 of the document holding plate. Ru. 42 is a protrusion provided on the front edge of the stack portion 34;
This is provided in order to avoid collision of originals for which double-sided reading has been completed with originals already accommodated in the stacking section 34, and to stack the originals in sequence.

本実施例における原稿押さえ板4は、原稿押さえと第2
の光路の形成とスタッカの機能とを合わせもつものであ
る。第2の光路L2は平面台形となるから上板33も平
面台形とし、スタック部34に排出された原稿を側方か
ら取り出し易いようにする。ミラー38は自動読み取り
ユニットのフレームに固定し、ミラー39は原稿押さえ
板に固定する。原稿押さえ板4と筺体1とを第2図に鎖
線で示すような台形の凸と凹からなる嵌合部材43で位
置決めしてやれば、原稿押さえ板4の閉鎖時にはミラー
38.39の相対位置が正確に位置決めされ、確実に原
稿22のイメージ情報を読み取ることができる。なお固
定読み取り時の原稿のセットは、第3図に示すように、
原稿押さえ板4を自動読み取りユニット2と共にピン5
回りに開閉して行う。
The original holding plate 4 in this embodiment has a second original holding plate and a second holding plate.
It has both the formation of an optical path and the function of a stacker. Since the second optical path L2 has a planar trapezoidal shape, the upper plate 33 also has a planar trapezoidal shape so that the originals discharged to the stack section 34 can be easily taken out from the side. The mirror 38 is fixed to the frame of the automatic reading unit, and the mirror 39 is fixed to the document holding plate. If the document holding plate 4 and the housing 1 are positioned using a fitting member 43 consisting of a trapezoidal convex and concave shape as shown by the chain line in FIG. 2, the relative positions of the mirrors 38 and 39 will be accurate when the document holding plate 4 is closed. The image information of the document 22 can be reliably read. The document setting for fixed scanning is as shown in Figure 3.
Place the document holding plate 4 together with the automatic reading unit 2 and the pin 5.
Open and close in rotation.

第4図および第5図は本発明の第2実施例を示したもの
で、自動読み取りユニット2を装置筐体1と一体に形成
すると共に、フィード台21を自動読み取りユニット2
の後端(図上右端)に立設したもので、原稿押さえ板4
は自動読み取りユニット2の前縁にピン5で開放可能に
設けられている。第2の光学系29の読み取り窓35や
光源ランプ36は、第1の光学系14のそれらと対称な
位置に配置されており、原稿押さえ板の上Fi33に形
成されたスリット37を介してイメージセンサ41に至
る第2の光路L2が形成されている。
4 and 5 show a second embodiment of the present invention, in which the automatic reading unit 2 is formed integrally with the device housing 1, and the feed table 21 is connected to the automatic reading unit 2.
It is installed upright at the rear end (right end in the figure), and is the original holding plate 4.
is provided at the front edge of the automatic reading unit 2 so that it can be opened with a pin 5. The reading window 35 and light source lamp 36 of the second optical system 29 are arranged at positions symmetrical to those of the first optical system 14, and the image is passed through a slit 37 formed in the Fi 33 above the document holding plate. A second optical path L2 leading to the sensor 41 is formed.

自動読み取りユニットの用紙通路28は、全体として5
字形のシンプルな形状となっており、原稿の表裏のイメ
ージ情報が対向位置で同時に読み取られる。
The paper path 28 of the automatic reading unit has a total of 5
It has a simple character shape, and image information on the front and back sides of the document can be read simultaneously at opposing positions.

第5図に示すように、第2実施例の原稿押さえ板は、自
動読み取りユニット2と別体に形成されており、開放時
には原稿押さえ坂4のみが開放されるので、フィード台
21上の原稿22を取り外すことなく原稿押さえ板4の
開閉を行うことができる。
As shown in FIG. 5, the document holding plate of the second embodiment is formed separately from the automatic reading unit 2, and when opened, only the document holding slope 4 is released. The document holding plate 4 can be opened and closed without removing the document holding plate 22.

なお、図示実施例では原稿押さえ板を自動読み取りユニ
ット側に開放する構造のみを示しているが、必要により
、原稿押さえ板を図の奥側に開放する構造とすることが
できる。
In the illustrated embodiment, only a structure in which the document holding plate is opened toward the automatic reading unit side is shown, but if necessary, a structure in which the document holding plate is opened toward the back side of the figure can be adopted.

(発明の効果) 以上のように、本発明の装置によれば、第2の光学系の
光路を充分に長くすることができ、かつ、イメージセン
サを装置筐体内に配置できるので、自動読み取りユニッ
トを小さくできる。更に一次元イメージセンサに連なる
第2の光路は偏平で原稿押さえ板に沿ってフラットに形
成できるので、原稿押さえ板の厚さが過大になることも
なく、従来の片面読み取り型の装置と同等の装置寸法で
且つ安価な構造で両面読み取りが実現できるという効果
がある。
(Effects of the Invention) As described above, according to the device of the present invention, the optical path of the second optical system can be made sufficiently long, and the image sensor can be placed inside the device housing. can be made smaller. Furthermore, the second optical path connected to the one-dimensional image sensor is flat and can be formed flat along the document holding plate, so the thickness of the document holding plate does not become excessive, and it is possible to achieve the same level as that of conventional single-sided reading devices. This has the advantage that double-sided reading can be realized with a small device size and an inexpensive structure.

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

第1図ないし第3図は本発明の第1実施例を示したもの
で、第1図は装置の断面図、第2図は全体斜視図、第3
図は原稿押さえ板を開放して示す装置の側面図である。 第4図及び第5図は本発明の第2実施例を示したもので
、第4図は装置の断面図、第5図は原稿押さえ板を開放
して示す装置の側面図である。第6図及び第7図は従来
装置を示す断面図である。 図中、 2:自動読み取りユニット 3:透明原稿台    4:原稿押さえ板8.40:結
像レンズ 9.41ニ一次元イメージセンサ
1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a sectional view of the device, FIG. 2 is an overall perspective view, and FIG.
The figure is a side view of the apparatus with the document holding plate opened. 4 and 5 show a second embodiment of the present invention, in which FIG. 4 is a cross-sectional view of the apparatus, and FIG. 5 is a side view of the apparatus with the document holding plate opened. FIGS. 6 and 7 are cross-sectional views showing conventional devices. In the figure, 2: Automatic reading unit 3: Transparent document table 4: Document holding plate 8.40: Imaging lens 9.41 Two-dimensional image sensor

Claims (1)

【特許請求の範囲】[Claims] フラットベッド型の透明原稿台(3)と、該原稿台に覆
着される原稿押さえ板(4)と、原稿台(3)の一側部
に位置する自動読み取りユニット(2)と、該読み取り
ユニットの原稿通路の一方の面に臨んで結像レンズ(8
)を介してイメージセンサ(9)に連なっている第1の
光路(L_1)とを備えたイメージ入力装置において、
自動読み取りユニット(2)の原稿通路(28)の他方
の面に臨む第2の光路(L_2)を有し、この第2の光
路は、原稿押さえ板(4)の内部ないし上方をその板面
と平行に通って結像レンズ(40)及び一次元イメージ
センサ(41)に連なっている、両面読み取り型イメー
ジ入力装置。
A flatbed type transparent document table (3), a document holding plate (4) covered with the document table, an automatic reading unit (2) located on one side of the document table (3), and the reading device. The imaging lens (8) faces one side of the document path of the unit.
) and a first optical path (L_1) connected to the image sensor (9) via the image sensor (9),
It has a second optical path (L_2) facing the other side of the document path (28) of the automatic reading unit (2), and this second optical path extends inside or above the document holding plate (4). A double-sided reading type image input device that passes in parallel to the imaging lens (40) and the one-dimensional image sensor (41).
JP17142088A 1988-07-08 1988-07-08 Double-sided read type image input device Pending JPH0220958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17142088A JPH0220958A (en) 1988-07-08 1988-07-08 Double-sided read type image input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17142088A JPH0220958A (en) 1988-07-08 1988-07-08 Double-sided read type image input device

Publications (1)

Publication Number Publication Date
JPH0220958A true JPH0220958A (en) 1990-01-24

Family

ID=15922803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17142088A Pending JPH0220958A (en) 1988-07-08 1988-07-08 Double-sided read type image input device

Country Status (1)

Country Link
JP (1) JPH0220958A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03240361A (en) * 1990-02-19 1991-10-25 Tokyo Electric Co Ltd Original reader
JP2007082033A (en) * 2005-09-16 2007-03-29 Ricoh Co Ltd Image reading device, image foring apparatus, and image reading control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03240361A (en) * 1990-02-19 1991-10-25 Tokyo Electric Co Ltd Original reader
JP2007082033A (en) * 2005-09-16 2007-03-29 Ricoh Co Ltd Image reading device, image foring apparatus, and image reading control method

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