JPH0336353B2 - - Google Patents

Info

Publication number
JPH0336353B2
JPH0336353B2 JP58100240A JP10024083A JPH0336353B2 JP H0336353 B2 JPH0336353 B2 JP H0336353B2 JP 58100240 A JP58100240 A JP 58100240A JP 10024083 A JP10024083 A JP 10024083A JP H0336353 B2 JPH0336353 B2 JP H0336353B2
Authority
JP
Japan
Prior art keywords
document
original
image
light
cover member
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 - Lifetime
Application number
JP58100240A
Other languages
Japanese (ja)
Other versions
JPS59225669A (en
Inventor
Junichi Asano
Hiroyuki Ishii
Otoya Kosugyama
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 JP58100240A priority Critical patent/JPS59225669A/en
Priority to US06/614,765 priority patent/US4623938A/en
Priority to GB08414367A priority patent/GB2142499B/en
Priority to DE19843421079 priority patent/DE3421079A1/en
Publication of JPS59225669A publication Critical patent/JPS59225669A/en
Publication of JPH0336353B2 publication Critical patent/JPH0336353B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00684—Object of the detection
    • H04N1/00687—Presence or absence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00742—Detection methods
    • H04N1/0075—Detecting a change in reflectivity
    • H04N1/00753—Detecting a change in reflectivity of a sheet relative to a particular backgroud
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00763—Action taken as a result of detection
    • H04N1/00774—Adjusting or controlling
    • H04N1/00782—Initiating operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
    • H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
    • H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
    • H04N1/1039—Movement of the main scanning components
    • H04N1/1052—Movement of the main scanning components of a mirror
    • H04N1/1056—Movement of the main scanning components of a mirror of two or more separate mirror arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
    • H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
    • H04N1/193—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line using electrically scanned linear arrays, e.g. linear CCD arrays

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Holders For Sensitive Materials And Originals (AREA)
  • Facsimile Scanning Arrangements (AREA)

Description

【発明の詳細な説明】 本発明は画像処理装置、特に、被読取り用の原
稿の有無あるいはサイズ等の各種光情報を光セン
サで検知し、これを電気処理する原稿検出装置を
有する画像処理装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image processing device, and more particularly, to an image processing device having a document detection device that detects various optical information such as the presence or absence or size of a document to be read using an optical sensor and electrically processes this information. Regarding.

一般に、上述したような原稿検出装置は種々の
用途に使用される。たとえば、ベルトやローラ等
を用いた原稿搬送装置で被読取り用の原稿を像投
影光学系の光路を横断して搬送することにより原
稿走査を行う方式、あるいは、前記原稿搬送装置
で原稿を所定の原稿支持面に搬送位置決めしてか
ら画像投影を行う方式の画像処理装置では、前記
原稿が前記光路中の、あるいは、前記原稿支持面
上の、所定位置に有るか無いか、または、これら
所定位置に到達したか否かを検出するために、前
述の原稿検出装置が使用されている。 Generally, document detection devices such as those described above are used for various purposes. For example, there is a method in which the original to be read is transported across the optical path of an image projection optical system to scan the original using a document transporting device using a belt or rollers, or a method in which the original is scanned by transporting the original to be read across the optical path of an image projection optical system, or In an image processing apparatus that projects an image after transporting and positioning the document onto the document support surface, it is possible to determine whether or not the document is at a predetermined position in the optical path or on the document support surface, or at these predetermined positions. The above-described document detection device is used to detect whether or not the document has been reached.

また、前記原稿検出装置を用いて原稿サイズを
検出することにより、記録紙サイズを選択した
り、原稿サイズと記録紙サイズとを比較して原稿
像の投影倍率を自動的に変更したりすることも行
なわれており、また原稿像を撮像素子で読取つて
電気信号に変換し、この信号に基づいて感光面や
記録紙等に画像を書き込む方式の画像形成装置で
は、原稿サイズに対応した領域にのみ画像信号を
書き込む等の処理も行われている。 Further, by detecting the document size using the document detection device, the recording paper size can be selected, and the projection magnification of the document image can be automatically changed by comparing the document size and the recording paper size. In addition, in image forming apparatuses that read the original image with an image sensor, convert it into an electrical signal, and write the image on a photosensitive surface or recording paper based on this signal, an area corresponding to the original size is Processing such as writing image signals only is also performed.

そこで、原稿の有無またはサイズを検知する方
式としては、光学的な方式、すなわち、光を原稿
の配置される領域に照射し、その原稿画像面から
の反射光を光センサで受光し、その入射強度に応
じた出力信号をとり出して原稿の有無または原稿
サイズを割り出す方式が、最も簡便で、実用性が
高い。 Therefore, as a method for detecting the presence or absence of a document or its size, an optical method is used. In other words, light is irradiated onto the area where the document is placed, and an optical sensor receives the reflected light from the document image surface. The method of extracting an output signal according to the intensity and determining the presence or absence of a document or the document size is the simplest and most practical method.

ここに於て、原稿の有無あるいはサイズを検出
する場合も、原稿像を電子写真感光体や撮像素子
に投影する場合も、前記原稿配置領域に光照射を
行なうのが普通である。従つてこの領域では、原
稿を原稿載置面に密着させ、また、原稿の照射光
が外部に漏れるのを防止する為に、原稿の背面側
に、原稿を覆うためのカバー、すなわち原稿覆い
部材を設けるのが一般的である。 In this case, it is common to irradiate the document placement area with light, both when detecting the presence or absence of a document or the size of the document, and when projecting a document image onto an electrophotographic photoreceptor or an image sensor. Therefore, in this area, in order to keep the original in close contact with the original placing surface and to prevent the irradiated light from the original from leaking outside, a cover to cover the original is placed on the back side of the original, that is, a document cover member. It is common to provide

そこで従来、上記原稿覆い部材としては、それ
の覆う原稿のサイズが小さい場合には、原稿の背
面側と対面する、原稿覆い部材の原稿覆い面の一
部、すなわち、原稿のサイズからはずれる領域に
ある原稿覆い面をも画像として記録してしまう場
合もあるので、その部分を白画像として記録させ
るために、上記原稿覆い面を白色としたものが使
用されている。 Therefore, conventionally, when the size of the document covered by the document cover member is small, a portion of the document cover surface of the document cover member facing the back side of the document, that is, an area that deviates from the size of the document, is used as the document cover member. Since there are cases where a certain document covering surface is also recorded as an image, the document covering surface is made white in order to record that part as a white image.

ところが、上記の場合に原稿の地色が原稿覆い
面と同様に白色のものに対しては、原稿の画像面
からの反射光と、原稿覆い部材の原稿覆い面から
の反射光とは、ほぼ同一レベルとして光センサで
検出されるため、これらの反射光の相違から原稿
の有無または原稿サイズを割り出すのははなはだ
困難となる。 However, in the above case, if the background color of the document is white like the document cover surface, the light reflected from the image surface of the document and the light reflected from the document cover surface of the document cover member are approximately equal to each other. Since they are detected by the optical sensor as having the same level, it is extremely difficult to determine the presence or absence of a document or the size of the document from the difference in these reflected lights.

そのため、上記原稿覆い面を黒色にしたり、あ
るいは、原稿の有無やサイズを検知する場合には
原稿覆い部材を開いて原稿の背面を覆わないよう
にする提案もなされている。このようにすれば、
原稿画像面からはみ出た領域からの反射光が光セ
ンサに入射することはないので、それらの光レベ
ルには明確な差が生じ、原稿の有無やサイズを判
別できる。 Therefore, proposals have been made to make the document cover surface black, or to open the document cover member so as not to cover the back surface of the document when detecting the presence or absence of a document and its size. If you do this,
Since the reflected light from the area protruding from the original image surface does not enter the optical sensor, there is a clear difference in the light level, and the presence or absence of the original and its size can be determined.

しかしこの場合には、次のような問題が生じ
る。一般に、原稿画像の感光体への投影あるいは
撮像素子での読み取りをする場合、原稿を光照射
して、その反射光を光学系を介して感光体あるい
は撮像素子等に結像する。この際、原稿に照射さ
れた光の一部はその表面で乱反射され、他は原稿
を透過して原稿の背面から出射する。その反射光
と透過光との比は原稿の材質や厚さ等により異な
る。もし、原稿の背面に他の紙がある場合（たと
えば本などの場合）や、白色の原稿覆い面を持つ
原稿覆い部材がある場合は、原稿を透過した光は
上記他の紙や覆い面の表面で反射され、その一部
が再び原稿を透過し、前記光学系を介して感光体
や撮像素子に投影され、感光体露光あるいは読み
取りに寄与する。従つて、一般の画像形成あるい
は処理装置では、上記のように原稿を透過して戻
つてきた光をも加えたレベルで、原稿地の白色の
レベルを設定している。ところが前述したよう
に、原稿覆い面を黒色にしたり、原稿覆い部材を
開放して原稿検出を行なつたりすると、この原稿
を透過した光は、黒色の原稿覆い面で吸収されて
しまつたり、空中に放散されてしまうため、感光
体露光あるいは読取り用の光として寄与しなくな
る。そのため、上記のような場合は、白色の原稿
覆い面を持つ原稿覆い部材を使用した場合に比べ
て、原稿地の白色に対する光量レベルが低下して
しまううことになる。たとえば、通常一般事務に
使用するような上質紙の原稿の場合、その原稿を
透過して戻つてこない光が多いため、得られた記
録画像の地がかなりかぶつてしまうこともある。
また、図面等に使用するトレーニングペーパの原
稿の場合、前記上質紙よりも更に多くの光が戻つ
てこなくなるため、記録画像の地は黒くなつてし
まう。すると、原稿情報と地の区別がほとんどつ
かなくなつてしまうので、実用面で多くの困難が
伴う。 However, in this case, the following problem occurs. Generally, when an original image is projected onto a photoreceptor or read by an image sensor, the original is irradiated with light and the reflected light is imaged on the photoreceptor or image sensor via an optical system. At this time, part of the light irradiated onto the original is diffusely reflected on the surface of the original, and the other part is transmitted through the original and exits from the back surface of the original. The ratio of the reflected light to the transmitted light varies depending on the material, thickness, etc. of the original. If there is another paper behind the original (for example, in the case of a book) or if there is a document cover member with a white original cover surface, the light that has passed through the original will be absorbed by the other paper or cover surface. It is reflected by the surface, a portion of which passes through the document again, and is projected onto the photoreceptor or image sensor via the optical system, contributing to photoreceptor exposure or reading. Therefore, in general image forming or processing apparatuses, the white level of the original is set at a level that also includes the light that has passed through the original and returned as described above. However, as mentioned above, when the document cover surface is made black or the document cover member is opened to perform document detection, the light that passes through the document is absorbed by the black document cover surface. Since it is diffused into the air, it no longer contributes as light for exposing the photoreceptor or for reading. Therefore, in the above case, the light intensity level for the white color of the original material will be lower than when a document covering member having a white original covering surface is used. For example, in the case of manuscripts made of high-quality paper such as those normally used for general office work, there is a lot of light that passes through the manuscript and does not return, so that the background of the resulting recorded image may overlap considerably.
In addition, in the case of a training paper original used for drawings, etc., even more light does not return than the above-mentioned high-quality paper, so the background of the recorded image becomes black. In this case, it becomes almost impossible to distinguish between the manuscript information and the location, which poses many practical difficulties.

そこで、現在実用化されている唯一の方法とし
て、感光体あるいは撮像素子の色感度が非常に高
い色（即ち、白と判断してしまうような色）に原
稿覆い面を着色し、逆にその色に対して低い色感
度を有する、上記撮像素子とは別個の光センサを
用いて原稿の有無などを判断しようとするものが
ある。すると、光センサにとつて、原稿覆い面の
色は、原稿地の白色と比して、暗く感じられるの
で、それら両者の相違が明確になる。しかし、原
稿地の色が必ずしも白色とは限らず、色地のもの
も多くあり、このような場合には、上記の手段で
は対応をつけられない。また、このような手段
は、原稿の有無やサイズを検出するための光セン
サを、原稿画像を読取り電気信号に変換する撮像
素子と兼用する装置には、利用できないという欠
点もある。 Therefore, the only method that is currently in practical use is to color the document cover surface in a color for which the photoreceptor or image sensor has extremely high color sensitivity (in other words, a color that would be interpreted as white), and vice versa. Some devices attempt to determine the presence or absence of a document using an optical sensor that is separate from the image sensor and has low color sensitivity. Then, to the optical sensor, the color of the document covering surface appears darker than the white color of the document surface, and the difference between the two becomes clear. However, the color of the document background is not necessarily white, and there are many cases of colored backgrounds, and in such cases, the above-mentioned means cannot provide correspondence. Furthermore, such a means has the disadvantage that it cannot be used in an apparatus in which an optical sensor for detecting the presence or absence of a document and its size also serves as an image sensor that reads an image of the document and converts it into an electrical signal.

本発明は上述したような問題点を解決するため
になされたものであり、誤検知を防止することが
でき、外観上の汚れを目立たなくすることのでき
る原稿検知装置を実現することを目的とする。 The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to realize a document detection device that can prevent false detection and can make stains on the exterior less noticeable. do.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の原稿検知装置は、 光源と、原稿を載置する原稿台と、この原稿台
を覆う覆い部材と、この覆い部材で覆われた原稿
台を覆い部材とは反対側から上記光源により照明
し得られる光を受光して電気信号に変換する光電
変換素子と、を有し、この光電変換素子からの出
力信号のレベルにより原稿の有無を検知する原稿
検知装置において、 上記覆い部材の原稿台側の面は上記光源から上
記原稿台への照射方向にヘアライン加工した半鏡
面であり、また上記光電変換素子は上記光源から
の正反射光が入射しない位置に設けられており、
上記光電変換素子からの出力信号が所定レベルよ
り大きい場合、上記原稿台の検知位置に原稿が有
ると判断することを特徴とする。 The document detection device of the present invention includes a light source, a document table on which a document is placed, a cover member that covers the document table, and the document table covered with the cover member is illuminated by the light source from the side opposite to the cover member. a photoelectric conversion element that receives light obtained from the photoelectric conversion element and converts it into an electrical signal, and detects the presence or absence of a document based on the level of the output signal from the photoelectric conversion element, the document platen of the cover member; The side surface is a semi-mirror surface processed with a hairline in the direction of irradiation from the light source to the document table, and the photoelectric conversion element is provided at a position where specularly reflected light from the light source does not enter.
If the output signal from the photoelectric conversion element is higher than a predetermined level, it is determined that there is a document at the detection position of the document table.

〔作用〕[Effect]

原稿台を覆う覆い面を半鏡面とすることで、汚
れを目立たなくすることができ、また、光源から
原稿台への照射方向にヘアライン加工が設けられ
ているので、原稿が無い場合の原稿覆い部材での
乱反射光を少なくすることができ、ヘアライン加
工をしたにもかかわらず光電変換素子の出力を小
さくすることができる。 The semi-mirror surface of the cover that covers the document table makes dirt less noticeable, and the hairline processing is provided in the direction of light from the light source to the document table, making it easy to cover the document when there is no original. Diffuse reflected light from the member can be reduced, and the output of the photoelectric conversion element can be reduced despite the hairline processing.

以下本発明をその実施例について図面を参照し
ながら説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図は本発明の特徴とする原稿覆い部材を適
用した画像処理装置の概略図である。画像読取り
部１には、その上面に被読取り用の原稿を載置す
るための原稿台ガラス２と、その上に載置された
上記原稿を覆うための、詳しくは後述するような
半鏡面の原稿覆い面を持つ開閉自在の原稿覆い部
材３とが取付けられている。更に画像読取り部１
の内部には、矢印で示す副走査方向に移動しなが
ら前記原稿の画像面等に光を照射するる光源４
と、それから発せられた光が前記画像面等で反射
された光をミラー５，６，７及びレンズ８を介し
て受光し電気信号に変換する固体撮像素子９とが
設けられている。 FIG. 1 is a schematic diagram of an image processing apparatus to which a document covering member, which is a feature of the present invention, is applied. The image reading section 1 includes a document table glass 2 for placing an original to be read on its upper surface, and a semi-mirror surface glass 2 for covering the document placed thereon, as will be described in detail later. A document cover member 3 having a document cover surface that can be opened and closed is attached. Furthermore, the image reading section 1
Inside, there is a light source 4 that irradiates light onto the image surface of the document while moving in the sub-scanning direction shown by the arrow.
A solid-state image sensor 9 is provided, which receives the light emitted from the image plane and reflected by the image plane through mirrors 5, 6, 7 and a lens 8, and converts it into an electrical signal.

また、画像記録部１０には、画像読取り部１か
ら受けた画像信号に従つたレーザ光を発射する半
導体レーザ１１と、回転しながら上記レーザ光の
進行方向を変えて感光体面を走査露光するための
回転多面鏡１２とを備えており、回転多面鏡１２
で反射されたレーザ光はミラー１３を介して感光
体ドラム１４上に導かれ、公知の電子写真の各プ
ロセスを経て、記録紙上に転写され、顕画化され
る。 The image recording unit 10 also includes a semiconductor laser 11 that emits a laser beam according to an image signal received from the image reading unit 1, and a semiconductor laser 11 that scans and exposes the surface of the photoreceptor by changing the traveling direction of the laser beam while rotating. The rotary polygon mirror 12 is equipped with a rotating polygon mirror 12.
The laser beam reflected by the laser beam is guided onto the photosensitive drum 14 via the mirror 13, and is transferred onto a recording paper through various known electrophotographic processes to be visualized.

尚、固体撮像素子９と半導体レーザ１１との間
には、不図示の原稿検出装置が設けられており、
不図示の制御回路により光源４が前記画像面なら
びに前記原稿覆い面を前走査することにより得ら
れた信号を、上記原稿検出装置が検知し、原稿の
有無、サイズあるいは位置を検出する。前走査に
より得られた上記情報を基に記録紙サイズや投影
倍率の選択を行つた後に、原稿画像情報を読取り
これを記録するため、本走査を行なう。 Note that a document detection device (not shown) is provided between the solid-state image sensor 9 and the semiconductor laser 11.
The original detecting device detects a signal obtained by pre-scanning the image plane and the original cover surface with the light source 4 by a control circuit (not shown), and detects the presence, size, or position of the original. After selecting the recording paper size and projection magnification based on the information obtained in the pre-scan, a main scan is performed in order to read and record document image information.

次に、本発明の最も特徴とする原稿覆い部材に
ついて説明する。原稿覆い部材は、それを閉じて
原稿台ガラス上に載置された原稿を覆つた場合
に、原稿覆い部材の原稿の背面に対面する側の
面、すなわち原稿覆い面を60ないし90％の半鏡面
としたものである。 Next, the document cover member, which is the most characteristic feature of the present invention, will be explained. When the document cover member is closed and covers the document placed on the document table glass, the document cover member covers 60 to 90% of the side of the document cover member that faces the back of the document, that is, the document cover surface. It has a mirror surface.

そこで、上記のような半鏡面とした原稿覆い面
で、上述した光源からの光が反射されて、検出さ
れるまでの原理について、第２図から第５図をも
とに説明する。 Therefore, the principle of how the light from the light source described above is reflected and detected on the semi-mirrored document covering surface as described above will be explained with reference to FIGS. 2 to 5.

第２図は原稿覆い部材３が原稿２０を覆つてい
る領域における光の反射原理を示す。光源４から
出た光は、その一部が原稿画像面２０ａで乱反射
して光線Ａとなり、他は原稿２０の内部を透過す
る。その透過光は、原稿覆い面３ａが半鏡面であ
るため、その面でほぼ（60ないし90％）正反射
し、その反射光は再度原稿２０の内部を透過し、
原稿画像面２０ａから出射するときに乱反射し、
その一部が光線Ｂとなる。光線Ａ及びＢは一体と
なつて、不図示のミラーあるいはレンズを介して
固体撮像素子９で受光される。ここで、原稿２０
がたとえばトレーシングペーパ等の半透明紙であ
る場合、前述した従来例のように原稿覆い面が黒
色であるとその面で光が吸収されてしまい固体撮
像素子での受光量が低下してしまうという問題が
あつたが、本発明においては原稿覆い面を半鏡面
としたため、光線Ａに光線Ｂが加えられることに
より十分な光量が得られ、より白色に近いレベル
として検知されるので、記録画像の地が黒つぼく
なつてしまうことはない。 FIG. 2 shows the principle of light reflection in the region where the document cover member 3 covers the document 20. As shown in FIG. A portion of the light emitted from the light source 4 is diffusely reflected on the document image surface 20a to become a light ray A, and the rest is transmitted through the interior of the document 20. Since the document cover surface 3a is a semi-mirror surface, the transmitted light is almost (60 to 90%) regularly reflected from that surface, and the reflected light is transmitted through the inside of the document 20 again.
It is diffusely reflected when emitted from the original image surface 20a,
A part of it becomes ray B. The light beams A and B are received together by the solid-state image sensor 9 via a mirror or lens (not shown). Here, manuscript 20
For example, if the document is made of translucent paper such as tracing paper, if the surface covering the document is black as in the conventional example described above, light will be absorbed by that surface and the amount of light received by the solid-state image sensor will decrease. However, in the present invention, since the document covering surface is semi-mirrored, a sufficient amount of light is obtained by adding light ray B to light ray A, and the recorded image is detected as a level closer to white. The land will never turn black.

第３図は原稿覆い部材３の下方に原稿の存在し
ない領域における光の反射原理を示す。この場合
は、光源４から出た光は、直接に原稿覆い面３ａ
でほぼ正反射されるため、固体撮像素子９に到達
する光はほとんどなくなる。すると、ほぼ黒色に
近いレベルとして検知されることになる。 FIG. 3 shows the principle of light reflection in a region below the document cover member 3 where no document exists. In this case, the light emitted from the light source 4 is directly directed to the document cover surface 3a.
Since the light is reflected almost specularly, almost no light reaches the solid-state image sensor 9. Then, it will be detected as a level that is almost black.

従つて、上述した第２図及び第３図で示した理
由から、たとえば第４図に示すように、幅Ｗの原
稿２０が原稿台ガラス２の上面に載置され、その
上方から原稿覆い部材３で覆つた状態に於て前走
査を行なつた場合、固体撮像素子９で受光され不
図示の原稿検出装置で検出された信号は第５図に
示すようになる。すなわち、Ｃ線に沿つた主走査
により得られた信号は第５図ａに示すように、原
稿２０の幅Ｗの部分は、像の描いてある部分を除
きほぼ白レベルとして検知され、原稿２０の周辺
部分は黒レベルとして検知される。また、原稿２
０の存在しないＤ線に沿つて主走査により得られ
た信号は第５図ｂに示すようにすべて黒レベルと
して検知される。 Therefore, for the reason shown in FIGS. 2 and 3 mentioned above, for example, as shown in FIG. When pre-scanning is performed in a state where the document is covered with a document 3, the signals received by the solid-state image pickup device 9 and detected by a document detection device (not shown) are as shown in FIG. That is, as shown in FIG. 5a, the signal obtained by main scanning along the C line is detected as almost a white level in the width W portion of the document 20 except for the portion where the image is drawn. The surrounding area is detected as a black level. Also, manuscript 2
All signals obtained by main scanning along the D line, where no 0 exists, are detected as a black level, as shown in FIG. 5b.

上述のようにして、第２図の原稿画像面２０ａ
あるいは原稿覆い面３ａからの反射光の検出が行
なわれるので、前述した従来例のように原稿覆い
面３ａを白色にしたために原稿の地白と原稿覆い
面の色との区別がつかなくなるという問題は生じ
ず、原稿２０の境界は明確に白レベルと黒レベル
とで区別されて検出される。よつて、詳しくは後
述するように、不図示の原稿検出装置により、そ
の走査過程で黒レベルの信号から白レベルの信号
に変化したところを原稿２０の端部として検知す
ることにより、原稿２０のサイズや位置を求める
ことができる。 As described above, the original image surface 20a in FIG.
Alternatively, since the reflected light from the document cover surface 3a is detected, there is a problem in that it becomes difficult to distinguish between the white background of the document and the color of the document cover surface because the document cover surface 3a is made white as in the conventional example described above. The boundary of the document 20 is detected clearly differentiated between the white level and the black level. Therefore, as will be described in detail later, a document detection device (not shown) detects the edge of the document 20 by detecting the point where the black level signal changes to the white level signal during the scanning process. Size and position can be determined.

次に、原稿覆い面３ａを60ないし90％の正反射
率にした理由について述べる。もし、原稿覆い面
３ａを90ないし100％の高い正反射率を持つ鏡面
とした場合、前述したようにトレーシングペーパ
からの反射光がより白レベルに近くなるのと同様
な理由で、原稿覆い面３ａに指紋等の汚れがある
と光を乱反射させてしまい、白レベルとして検知
され誤認識されるという問題が生じ、また更に、
外観的にも非常に目立つてしまう。これを60ない
し90％の半鏡面にした場合は、以下のような理由
で上記の問題点はほぼ解消される。すなわち、第
６図は、原稿２０としてのトレーシングペーパ、
原稿覆い面３ａ上の指紋等の汚れ及び汚れのない
原稿覆い面３ａを走査して読取つた場合の、原稿
覆い面３ａの正反射率に対する読取りレベルの関
係を示す線図である。ここで、原稿覆い面３ａの
正反射率が95％の場合と70％の場合とを比較して
みる。すると、読取りレベルの汚れに対するもの
と原稿覆い面３ａに対するものとの差は、95％の
場合はｍで、70％の場合はｎ（ｍ＞ｎ）となり、
後者の方が汚れが目立たなくなることが明確であ
る。また、トレーシングペーパ等の半透明紙に対
する読取りレベルは、正反射率が小さくなるほど
減少するが、その変化の割合は微少であるため、
Ｓ／Ｎ比の低下はほとんど無視できる。従つて、
汚れの目立ちやすさ及びＳ／Ｎ比の低下の問題を
考慮して実験した結果によると、60ないし90％の
正反射率が非常に良好であることがわかつた。 Next, the reason why the document covering surface 3a is made to have a regular reflectance of 60 to 90% will be described. If the document cover surface 3a is made of a mirror surface with a high specular reflectance of 90 to 100%, the light reflected from the tracing paper will become closer to the white level as described above. If there is dirt such as a fingerprint on the surface 3a, the light will be reflected diffusely, causing the problem that it will be mistakenly detected as a white level.
It is also very conspicuous in appearance. If this is made into a 60 to 90% semi-mirror surface, the above problems are almost eliminated for the following reasons. That is, FIG. 6 shows tracing paper as the original 20,
FIG. 3 is a diagram showing the relationship between the reading level and the specular reflectance of the document covering surface 3a when scanning and reading the document covering surface 3a which is free from stains such as fingerprints on the document covering surface 3a; FIG. Here, let us compare the case where the specular reflectance of the document cover surface 3a is 95% and the case where it is 70%. Then, the difference between the reading level for dirt and the original covering surface 3a is m in the case of 95% and n (m>n) in the case of 70%.
It is clear that the latter makes dirt less noticeable. In addition, the reading level for translucent paper such as tracing paper decreases as the specular reflectance decreases, but the rate of change is minute, so
The reduction in S/N ratio is almost negligible. Therefore,
According to the results of experiments taking into consideration the problems of conspicuous dirt and reduction of S/N ratio, it was found that a specular reflectance of 60 to 90% is very good.

尚ここで、60ないし90％の正反射率を持つ半鏡
面をつくるためのより有効な手段については以下
のようなものがある。そのひとつとして、高い正
反射率を持つ鏡面にヘアライン加工する手段があ
る。ただしこの場合、光源から原稿台への照射方
向である副走査方向にライン方向を合致させない
と、ヘアライン面の乱反射光により、その面の読
取りレベルが白レベルに近いものになつてしまい
良好な結果が得られない。他の手段としては、鏡
面に梨地加工をしたり、あるいは、鏡面に半透明
シートを重ねてもよい。いずれの方法であつて
も、正反射率を60ないし90％にした場合には、前
述したような良好な結果を得ることができる。 Here, the following is a more effective means for creating a semi-mirror surface with a regular reflectance of 60 to 90%. One such method is to apply a hairline finish to a mirror surface with high specular reflectance. However, in this case, if the line direction is not aligned with the sub-scanning direction, which is the irradiation direction from the light source to the document table, the reading level of that surface will become close to the white level due to the diffusely reflected light from the hairline surface, resulting in poor results. is not obtained. Other means include applying a satin finish to the mirror surface, or overlaying a translucent sheet on the mirror surface. Regardless of the method, if the regular reflectance is set to 60 to 90%, good results as described above can be obtained.

次に前述したような前走査時に行う原稿検出手
段、特に原稿位置を検出する手段について以下に
説明する。 Next, a description will be given below of the document detecting means performed during pre-scanning as described above, particularly the means for detecting the document position.

第７図には画像読取り部１の原稿台ガラス２上
に原稿２０が置かれている状態を示す。基本的に
は載置位置は決まつているが、図の如く斜めにも
置ける。この場合、原稿台ガラス２上の基準点
SPから主走査方向をＸ，副走査方向をＹとした
時の原稿２０の四隅の座標P1（X1，Y1），P2（X2，
Y2），P3（X3，Y3），P4（X4，Y4）を光学系を前
走査して検出し、これにより原稿の大きさや位置
を判別するものである。なお、原稿２０の置かれ
ている領域外の画像データは必ず黒データになる
様に、原稿覆い面３ａが前述のように半鏡面処理
されている。前走査はガラス面全域を行なうべ
く、主走査，副走査を行ない、その後引続き、画
像読取り及び画像記録の為の走査を行なう。 FIG. 7 shows a state in which an original 20 is placed on the original table glass 2 of the image reading section 1. As shown in FIG. Basically, the placement position is fixed, but it can also be placed diagonally as shown in the figure. In this case, the reference point on the platen glass 2
Coordinates of the four corners of the original 20 when the main scanning direction is X and the sub-scanning direction is Y from SP, P 1 (X 1 , Y 1 ), P 2 (X 2 ,
Y 2 ), P 3 (X 3 , Y 3 ), and P 4 (X 4 , Y 4 ) are detected by pre-scanning the optical system, thereby determining the size and position of the document. Note that the document cover surface 3a is semi-mirror-finished as described above so that image data outside the area where the document 20 is placed is always black data. The pre-scanning includes main scanning and sub-scanning to cover the entire glass surface, followed by scanning for image reading and image recording.

第８図は前記座標を検出する原稿検出装置の一
回路図である。これをもとに、以下その回路処理
を順次説明する。前走査により白画像または黒画
像として２値化された画像データ（VIDEO）は
シフト・レジスタ３０に８ビツト単位で入力され
る。８ビツト入力が完了した時点で、ゲート回路
３１は８ビツトデータの全てが白画像かのチエツ
クを行ない、Yesならば信号ライン３２に１を出
力する。 FIG. 8 is a circuit diagram of a document detection device that detects the coordinates. Based on this, the circuit processing will be sequentially explained below. Image data (VIDEO) binarized as a white image or a black image by pre-scanning is input to the shift register 30 in units of 8 bits. When the 8-bit input is completed, the gate circuit 31 checks whether all of the 8-bit data is a white image, and if Yes, outputs 1 to the signal line 32.

原稿走査開始後、最初の８ビツト白が現われた
時Ｆ／Ｆ３３がセツトする。このＦ／Ｆ３３は
VSYNC（画像先端信号）によつて予めリセツト
されており、次のVSYNCの来るまでセツトし放
しである。Ｆ／Ｆ３３がセツトした時点でラツチ
３４にその時の主走査カウンタ３５の値がロード
される。これが点P1のＸ座標値X1になる。同時
に、ラツチ３６にその時の副走査カウンタ３７の
値がロードされる。これが点P1のＹ座標値Y1に
なる。従つて点P1の座標（X1，Y1）が求まる。 After starting scanning the original, the F/F 33 is set when the first 8-bit white appears. This F/F33
It is reset in advance by VSYNC (image leading edge signal) and remains set until the next VSYNC comes. When the F/F 33 is set, the value of the main scanning counter 35 at that time is loaded into the latch 34. This becomes the X coordinate value X1 of point P1 . At the same time, the latch 36 is loaded with the value of the sub-scanning counter 37 at that time. This becomes the Y coordinate value Y1 of point P1 . Therefore, the coordinates (X 1 , Y 1 ) of point P 1 are found.

又信号ライン３２に１が出力する度に主走査カ
ウンタ３５の値をラツチ３８にロードする。この
値は直ちに（次の８ビツトデータがシフトレジス
タ３０に入る迄に）ラツチ３９に記憶される。最
初の８ビツトの白が現われた時の主走査カウンタ
３５の値がラツチ３９にロードされると、ラツチ
４０（これはVSYNC時点で“０”にされてい
る）のデータとコンパレータ４１で大小比較され
る。もしラツチ３９のデータの方が大ならばコン
パレータ４１は信号を出しラツチ３８のデータ
（これはラツチ３９のデータと等しい）がラツチ
４０にロードされる。又、この時副走査カウンタ
３７の値がラツチ４２にロードされる。この動作
は次の８ビツトがシフト・レジスタ３０に入る迄
に処理される。この様にラツチ３９とラツチ４０
のデータの比較動作を全画像領域について行なえ
ば、ラツチ４０には原稿領域Ｘ方向の最大値が残
り、この時のＹ方向の座標がラツチ４２に残るこ
とになる。従つて点P2の座標（X2，Y2）が求ま
る。 Also, each time 1 is output on the signal line 32, the value of the main scanning counter 35 is loaded into the latch 38. This value is immediately stored in latch 39 (until the next 8 bit data enters shift register 30). When the value of the main scanning counter 35 when the first 8-bit white appears is loaded into the latch 39, the value is compared with the data of the latch 40 (which is set to "0" at VSYNC) by the comparator 41. be done. If the data in latch 39 is greater, comparator 41 signals and the data in latch 38 (which is equal to the data in latch 39) is loaded into latch 40. Also, at this time, the value of the sub-scanning counter 37 is loaded into the latch 42. This operation is processed until the next 8 bits enter the shift register 30. Like this, latch 39 and latch 40
If the data comparison operation is performed for the entire image area, the maximum value of the document area in the X direction remains in the latch 40, and the coordinate in the Y direction at this time remains in the latch 42. Therefore, the coordinates (X 2 , Y 2 ) of point P 2 are found.

Ｆ／Ｆ４３は各主走査ライン毎に最初に８ビツ
ト白が現われた時点でセツトするＦ／Ｆで、水平
同期信号HSYNCでリセツトされ、最初の８ビツ
ト白でセツトし、次のHSYNCまで保持する。こ
のＦ／Ｆ４３がセツトする時点で主走査カウンタ
３５の値をラツチ４４にセツトし、次のHSYNC
迄の間にラツチ４５にロードする。そしてラツチ
４６とコンパレータ４７で大小比較される。ラツ
チ４６にはVSYNC発生時点でＸ方向の最大値が
ブリセツトされている。もしラツチ４６のデータ
の方がラツチ４５のデータより大きいならばコン
パレータ４７は信号を出しラツチ４４のデータ
（これはラツチ４５のデータと等しい）がラツチ
４６にロードされる。この動作はHSYNCと次の
HSYNCとの間で行なわれる。以上の比較動作を
全画像領域について行なうとラツチ４６には原稿
座標のＸ方向の最小値が残ることになる。これが
点P3のＸ座標値X3である。又、これと同時にコ
ンパレータ４７からの出力信号により副走査カウ
ンタ３７の値がラツチ４８にロードされる。これ
が点P3のＹ座標値Y3になる。従つて、点P3（X3，
Y3）が求まる。 F/F 43 is an F/F that is set when the first 8 bits of white appear on each main scanning line. It is reset by the horizontal synchronization signal HSYNC, sets it at the first 8 bits of white, and holds it until the next HSYNC. . At the time when this F/F 43 is set, the value of the main scanning counter 35 is set in the latch 44, and the next HSYNC is set.
In the meantime, the latch 45 is loaded. Then, the latch 46 and the comparator 47 compare the magnitude. The latch 46 is preset to the maximum value in the X direction at the time VSYNC occurs. If the data in latch 46 is greater than the data in latch 45, comparator 47 signals that the data in latch 44 (which is equal to the data in latch 45) is loaded into latch 46. This behavior is similar to HSYNC and the following
This is done with HSYNC. If the above comparison operation is performed for the entire image area, the minimum value of the document coordinates in the X direction remains in the latch 46. This is the X coordinate value X3 of point P3 . At the same time, the value of the sub-scanning counter 37 is loaded into the latch 48 by the output signal from the comparator 47. This becomes the Y coordinate value Y3 of point P3 . Therefore, point P 3 (X 3 ,
Y 3 ) is found.

ラツチ４９と５０は全画像領域において８ビツ
ト白が現われる度にその時の主走査カウンタ３５
の値と副走査カウンタ３７の値がロードされる。
従つて、原稿前走査完了時では最後に８ビツト白
が現われた時点でのカウント値がラツチ４９と５
０に残つていることになる。これにより点P4
（X4，Y4）が求まる。 Latches 49 and 50 set the current main scanning counter 35 each time 8-bit white appears in the entire image area.
and the value of the sub-scanning counter 37 are loaded.
Therefore, when the original pre-scanning is completed, the count value at the time when 8-bit white appears last is latches 49 and 5.
It will remain at 0. This results in point P 4
(X 4 , Y 4 ) is found.

以上の８つのラツチ（３４，３６，４０，４
２，４６，４８，４９，５０）のデータラインは
不図示のcpuのバスライン（BUS）に接続され、
該cpuは前走査終了時にこのデータを読み込むこ
とになる。そして、これらのデータのうち、点
（X1，Y1），（X2，Y1）（X1，Y4）及び（X2，
Y4）で囲まれる領域を原稿領域として判別する。
これに基づき、画像読取り走査のストロークを決
めたり、所望のサイズの給紙カセツトを選択した
りする処理を、画像記録のための原稿走査時に行
なう。 The above eight latches (34, 36, 40, 4
The data lines (2, 46, 48, 49, 50) are connected to the bus line (BUS) of the CPU (not shown),
The CPU will read this data at the end of the previous scan. Of these data, the points (X 1 , Y 1 ), (X 2 , Y 1 ) (X 1 , Y 4 ) and (X 2 ,
The area surrounded by Y4 ) is determined as the document area.
Based on this, processing for determining the image reading scanning stroke and selecting a paper feed cassette of a desired size is performed when scanning the document for image recording.

従つて本発明は上述したような原稿位置を検出
する際に於ても、本発明の最も特徴とする原稿覆
い部材の作用により、原稿の材質の違いにかかわ
らず、その正確な位置検出を可能にし、また、指
紋等による外観上の汚れも目立たず、白レベルあ
るいは黒レベルの設定も容易にできて、誤動作の
危険性もなくなるという非常に優れた効果を奏す
るものである。 Therefore, even when detecting the position of the original as described above, the present invention enables accurate position detection regardless of the material of the original due to the action of the original covering member, which is the most characteristic feature of the present invention. In addition, it has very excellent effects in that it does not have conspicuous stains on the exterior due to fingerprints, etc., the white level or black level can be easily set, and there is no risk of malfunction.

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

第１図は本発明の特徴とする原稿覆い部材を適
用した画像処理装置の一例を示す概略図、第２図
及び第３図は本発明の特徴とする原稿覆い部材で
の光の反射原理を示す説明図、第４図は原稿の載
置状態を示す概略図、第５図ａ及びｂは原稿検出
装置で検出される信号を示す波形図、第６図は鏡
面の正反射率と読取りレベルとの関係を示す線
図、第７図は原稿台ガラス上に原稿が載置された
状態を示す略図、第８図は原稿位置を検出するた
めの原稿検出装置の一回路図である。 １…画像読取り部、２…原稿台ガラス、３…原
稿覆い部材、４…光源、３ａ…原稿覆い面、８…
レンズ、５，６，７…ミラー、９…固体撮像素
子、１０…画像記録部、１１…半導体レーザ、１
２…回転多面鏡、１３…ミラー、１４…感光体ド
ラム。 FIG. 1 is a schematic diagram showing an example of an image processing apparatus to which a document cover member, which is a feature of the present invention, is applied, and FIGS. 2 and 3 illustrate the principle of light reflection in a document cover member, which is a feature of the present invention. Fig. 4 is a schematic diagram showing the state in which the original is placed, Fig. 5 a and b are waveform diagrams showing the signals detected by the original detection device, and Fig. 6 shows the specular reflectance of the mirror surface and the reading level. FIG. 7 is a schematic diagram showing a state in which an original is placed on the original table glass, and FIG. 8 is a circuit diagram of an original detecting device for detecting the original position. DESCRIPTION OF SYMBOLS 1... Image reading part, 2... Original table glass, 3... Original covering member, 4... Light source, 3a... Original covering surface, 8...
Lens, 5, 6, 7... Mirror, 9... Solid-state image sensor, 10... Image recording unit, 11... Semiconductor laser, 1
2...Rotating polygon mirror, 13...Mirror, 14...Photosensitive drum.

Claims (1)

【特許請求の範囲】 １ 光源と、原稿とを置する原稿台と、この原稿
台を覆う覆い部材と、この覆い部材で覆われた原
稿台を覆い部材と反対側から上記光源により照明
し得られる光を受光して電気信号に変換する光電
変換素子と、を有し、この光電変換素子からの出
力信号のレベルにより原稿の有無を検知する原稿
検知装置において、 上記覆い部材の原稿台側の面は上記光源から上
記原稿台への照射方向にヘアライン加工した半鏡
面であり、また上記光電変換素子は上記光源から
の正反射光が入射しない位置に設けられており、
上記光電変換素子からの出力信号が所定レベルよ
り大きい場合、上記原稿台の検知位置に原稿が有
ると判断することを特徴とする原稿検知装置。[Claims] 1. A light source, a document table on which a document is placed, a cover member that covers the document table, and a document table covered with the cover member that can be illuminated by the light source from the side opposite to the cover member. a photoelectric conversion element that receives light emitted from the photoelectric conversion element and converts it into an electrical signal, and detects the presence or absence of a document based on the level of the output signal from the photoelectric conversion element, the document detection device comprising: The surface is a semi-mirror surface processed with a hairline in the direction of irradiation from the light source to the document table, and the photoelectric conversion element is provided at a position where specularly reflected light from the light source does not enter.
A document detection device characterized in that, when an output signal from the photoelectric conversion element is higher than a predetermined level, it is determined that a document is present at a detection position on the document table.
JP58100240A 1983-06-07 1983-06-07 Picture processing device Granted JPS59225669A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP58100240A JPS59225669A (en) 1983-06-07 1983-06-07 Picture processing device
US06/614,765 US4623938A (en) 1983-06-07 1984-05-29 Original image processing apparatus with improved cover
GB08414367A GB2142499B (en) 1983-06-07 1984-06-05 An original image processing apparatus
DE19843421079 DE3421079A1 (en) 1983-06-07 1984-06-06 IMAGE PROCESSING DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58100240A JPS59225669A (en) 1983-06-07 1983-06-07 Picture processing device

Publications (2)

Publication Number Publication Date
JPS59225669A JPS59225669A (en) 1984-12-18
JPH0336353B2 true JPH0336353B2 (en) 1991-05-31

Family

ID=14268723

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58100240A Granted JPS59225669A (en) 1983-06-07 1983-06-07 Picture processing device

Country Status (1)

Country Link
JP (1) JPS59225669A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61113451U (en) * 1984-12-26 1986-07-17
JPS61166265A (en) * 1985-01-17 1986-07-26 Nippon Seimitsu Kogyo Kk Optical reader
JPS6276962A (en) * 1985-09-30 1987-04-09 Canon Inc Original recognition device
JP2012023564A (en) * 2010-07-14 2012-02-02 Fuji Xerox Co Ltd Image processing apparatus
JP2015012347A (en) * 2013-06-27 2015-01-19 富士ゼロックス株式会社 Document reading device and image forming apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5595805A (en) * 1979-01-12 1980-07-21 Matsushita Electric Ind Co Ltd Original paper size detector for copying machine
JPS59215175A (en) * 1983-05-23 1984-12-05 Ricoh Co Ltd Document information reader

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6235086Y2 (en) * 1977-03-15 1987-09-07

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5595805A (en) * 1979-01-12 1980-07-21 Matsushita Electric Ind Co Ltd Original paper size detector for copying machine
JPS59215175A (en) * 1983-05-23 1984-12-05 Ricoh Co Ltd Document information reader

Also Published As

Publication number Publication date
JPS59225669A (en) 1984-12-18

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