JPS626105A - Original size detector for copying machine - Google Patents

Original size detector for copying machine

Info

Publication number
JPS626105A
JPS626105A JP14555385A JP14555385A JPS626105A JP S626105 A JPS626105 A JP S626105A JP 14555385 A JP14555385 A JP 14555385A JP 14555385 A JP14555385 A JP 14555385A JP S626105 A JPS626105 A JP S626105A
Authority
JP
Japan
Prior art keywords
original
document
light
size
detector
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
Application number
JP14555385A
Other languages
Japanese (ja)
Other versions
JPH0612246B2 (en
Inventor
Isao Yamaguchi
勲 山口
Atsuhiko Miyagawa
宮川 厚彦
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP60145553A priority Critical patent/JPH0612246B2/en
Publication of JPS626105A publication Critical patent/JPS626105A/en
Publication of JPH0612246B2 publication Critical patent/JPH0612246B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Holders For Sensitive Materials And Originals (AREA)

Abstract

PURPOSE:To constitute the titled compact detector by providing plural photocouplers at a prescribed place so that the surface formed by the optical axes of a light emitting element and a photodetecting element is inclined by about 20 deg. with normal of original platen glass below the original platen glass. CONSTITUTION:Original size detectors 16 are fixed at plural places 23-26 below the original platen glass 2 on which an original 4 is put. Then, the detector 16 forms a spot with a diameter of 8mm on the underside of the original 4 with the light from the light emitting element 17 by a lens 18 and the reflected light is condensed on the photodetecting element 19 by a lens 20. Further, the light is projected slantingly so that the surface formed by the optical axes of the light emitting element 17 and the photodetecting element 19 is inclined by about 20 deg. with the normal of the original platen glass 2. As to the detectors 16, the presence or absence of the original is detected by the detector at the fist 23 position and when there is he original, the detector at other position is operated. hereby, the presence or absence and the size of the original can be detected accurately.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、静電転写方式の複写機に係り、特に原稿サイ
ズを自動的に検知する複写機原稿サイズ検知装置に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrostatic transfer type copying machine, and more particularly to a copying machine document size detection device that automatically detects the document size.

従来の技術 従来、複写機でコピーしようとする原稿のサイズを検知
する方法としては、ムDFを用いて、原稿を原稿台ガラ
ス面上に送シ込むようにしてムDFに原稿をセットした
ときの幅と長さを続んで原稿サイズを検知する方法があ
る。別の方法としては、原稿を押さえる原稿台カバーに
うすい黄色や青色に全面を着色したシ、あるいはしま紋
様をつけておき、原稿を光学系が露光走査する前に予備
走査をして、走査する光学系にと9つけられた光センサ
で原稿を読みとる方法等がある。
Conventional technology Conventionally, a method for detecting the size of an original to be copied using a copying machine is to use a multi-function DF to feed the original onto the glass surface of the original platen, and to measure the width of the original when the original is set on the multi-function DF. There is a method of detecting the document size by following the length. Another method is to attach a pale yellow or blue colored stripe or striped pattern to the document table cover that holds the document, and then perform a preliminary scan of the document before the optical system scans it for exposure. There is a method of reading a document using an optical sensor attached to an optical system.

前者の方法では、ムDFを使用しないで本等の厚物をコ
ピーする場合には原稿の寸法を検知できないという不都
合がある。
The former method has the disadvantage that the dimensions of the document cannot be detected when copying a thick object such as a book without using a DF.

後者の方法では、原稿台カバーの色はうすく、コピーを
してもコピー画像には黒くうつらないような配慮はしで
あるものの、濃い目にコピーした場合、原稿が小さかっ
たシ、あるいはずれて置かれた場合には、バックの原稿
台カバーがうつってしまい、周辺部に黒い線が出てしま
うことになる。
In the latter method, the color of the document cover is light and the color of the document cover is light so that even if the copy is made, the black color does not appear on the copied image. If it is placed on the back, the document table cover on the back will slide down and a black line will appear around the periphery.

また、予備走査を必要とするため、例えば原稿サイズを
読んでから自動的にコピー用紙に合った倍率を選択する
ような自動倍率選択をする場合には、正規のコピー動作
に入るまでにかなり時間がかかってしまうという不都合
がある。
In addition, because preliminary scanning is required, for example, when performing automatic magnification selection that automatically selects the magnification that matches the copy paper after reading the original size, it takes a considerable amount of time before the regular copying operation begins. There is an inconvenience that it takes a while.

発明が解決しようとする問題点 上記のような原稿サイズ検知方法の複写機では前述のよ
うに、厚物原稿のサイズが検知できなかったシ、コピー
の周辺部によごれが出たシ、正規の露光走査までに時間
がかかるという欠点がある。
Problems to be Solved by the Invention As mentioned above, copying machines that use the original size detection method described above cannot detect the size of thick originals, have dirt on the periphery of copies, and have problems with regular copies. The disadvantage is that it takes time to perform the exposure scan.

本発明は、後に詳細に述べる方法によシ厚物原稿、うす
物原稿にかかわらず原稿のサイズを検知できるようにす
るとともに、コピー画像によごれが発生することもなく
、また検知時間も要することのない複写機原稿サイズ検
知装置を提供することを目的としたものである。
The present invention makes it possible to detect the size of a document regardless of whether it is a thick document or a thin document by a method described in detail later, and also prevents the copying image from becoming smudged and requires a long detection time. The object of the present invention is to provide a copying machine document size detection device that does not require a copying machine document size detection device.

問題点を解決するための手段 本発明は上記問題点を解決するため複写機本体の原稿台
ガラス下面を走査する光学系の下方に原稿台ガラスに向
けて光を照射するように設けられた発光素子とレンズお
よび原稿台ガラス面上の原稿から反射してきた反射光を
受光するための受光素子とレンズとよりなる原稿サイズ
検知器を複数個設け、発光素子から出た光が原稿台ガラ
ス下面で反射して、受光素子に入ることのないよう発光
素子および受光素子との光軸で形成される面を原稿台ガ
ラス下面の法線に対し20度程度傾けるようにしている
Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a light emitting device which is provided below the optical system that scans the lower surface of the document table glass of the main body of the copying machine so as to irradiate light toward the document table glass. A plurality of document size detectors each consisting of an element, a lens, and a light-receiving element and a lens are provided to receive light reflected from the document on the document glass surface, and the light emitted from the light emitting element is detected on the bottom surface of the document glass platen. To prevent light from being reflected and entering the light receiving element, the surface formed by the optical axis of the light emitting element and the light receiving element is tilted at approximately 20 degrees with respect to the normal to the lower surface of the document table glass.

作用 本発明は上記した構成によシ、ムDFを用いることなく
、また原稿台カバーを着色したシ光学系の予備走査を必
要とせず、原稿台ガラス面に置かれた原稿のサイズを精
度よくかつ迅速に読みとり判断することができる。
Effects of the present invention With the above-described structure, the size of the original placed on the glass surface of the document table can be accurately determined without using a DF or without the need for preliminary scanning of an optical system with a colored document table cover. and can read and judge quickly.

実施例 以下本発明の実施例について図面を参照して説明する。Example Embodiments of the present invention will be described below with reference to the drawings.

第1図は本発明による複写機の概略断面図である。図に
おいて、1は複写機本体、2は複写機本体上部に設けら
れた原稿台ガラス、3は原稿台ガラス2を覆うように設
けられた開閉可能な原稿台カバーである。原稿台ガラス
2の下側内部には原稿台ガラス2の上に置かれた原稿4
を走査して感光体5への露光を行なう光学系6が設けら
れている。光学系6は露光ランプ7と一体に原稿4の左
端から右端まで動くミラー8を備えた等速ユニット10
と等速ユニット10の腫の速度で動く2枚のミラー11
,12よシなる半速ユニット13およびレンズ14、ミ
ラー16とからなっている。
FIG. 1 is a schematic sectional view of a copying machine according to the present invention. In the figure, reference numeral 1 denotes a main body of the copying machine, reference numeral 2 denotes a document table glass provided on the upper part of the copy machine main body, and reference numeral 3 denotes an openable and closable document table cover provided so as to cover the document table glass 2. As shown in FIG. A document 4 placed on the document table glass 2 is placed inside the lower side of the document table glass 2.
An optical system 6 is provided that scans and exposes the photoreceptor 5 to light. The optical system 6 includes a constant velocity unit 10 that includes an exposure lamp 7 and a mirror 8 that moves from the left edge to the right edge of the original 4.
and two mirrors 11 that move at the same speed as the constant velocity unit 10.
, 12, a half-speed unit 13, a lens 14, and a mirror 16.

等速ユニット10、半速ユニット13の走査によシ、原
稿4の光像が感光体5の上に順次投影される。コピー動
作開始前には等速ユニツ)10および半速ユニット13
は第1図の最左端の原点位置にある。等速ユニット10
および半速ユニット13が原稿4を走査するとき、その
移動のじゃまにならない方向の位置に複数個の原稿サイ
ズ検知器16が設けられている。
As the constant speed unit 10 and the half speed unit 13 scan, the optical image of the original 4 is sequentially projected onto the photoreceptor 5. Before the start of the copy operation, the constant speed unit) 10 and the half speed unit 13
is located at the origin position at the leftmost end of FIG. Constant velocity unit 10
When the half-speed unit 13 scans the original 4, a plurality of original size detectors 16 are provided at positions that do not interfere with the movement of the original 4.

各々の原稿サイズ検知器16は第2図に示すような構成
となっている。発光素子17から出た光はレンズを通シ
原稿台ガラメ2の上面21で発光素子17の発光面が結
像される。受光素子19は゛レンズ20によシその受光
面の像が先の発光面の像が結像する焦点位置21に結像
するように設けられている。原稿台ガラス2の上に原稿
4がある部分では発光素子17からの光が結像している
ため明るくなっておシ、その明るい部分が受光素子19
の受光面に結像する結果、受光素子19からは出力信号
が出る。発光素子17、受光素子19はそれぞれレンズ
18,20によシ原稿面でピントがあうような状態に配
置されているため、受光素子19からの出力は大きく出
る。原稿面には文字や絵が黒く書かれているため、焦点
位置21のピントのあう画面を小さくしすぎると、黒い
部分は原稿がないとして誤読してしまう。本発明の実施
例ではこの発光素子の結像面積を直径511M乃至10
Bとし、特に8′InIIの円形になるようにレンズの
焦点距離、レンズと発光面および受光面、原稿台ガラス
2の位置関係を設定することにより最適の効果を得てい
る。原稿台ガラス2の上に原稿がない部分では発光素子
17からの光は通過してしまうので受光素子19には出
力はでない。
Each document size detector 16 has a configuration as shown in FIG. The light emitted from the light emitting element 17 passes through the lens, and the light emitting surface of the light emitting element 17 is imaged on the upper surface 21 of the document platen glass 2. The light-receiving element 19 is provided by the lens 20 so that the image of its light-receiving surface is formed at a focal point 21 where the previous image of the light-emitting surface is formed. The part where the original 4 is placed on the original table glass 2 becomes bright because the light from the light emitting element 17 forms an image, and the bright part is the part where the original 4 is placed on the light receiving element 19.
As a result, an output signal is output from the light receiving element 19. Since the light-emitting element 17 and the light-receiving element 19 are arranged so that the document surface is in focus with the lenses 18 and 20, respectively, the output from the light-receiving element 19 is large. Since characters and pictures are written in black on the document surface, if the screen that is in focus at the focal point position 21 is made too small, the black portions will be mistakenly read as there is no document. In the embodiment of the present invention, the imaging area of this light emitting element is 511M to 10M in diameter.
In particular, the optimum effect is obtained by setting the focal length of the lens, the positional relationship between the lens, the light-emitting surface, the light-receiving surface, and the document platen glass 2 so that it forms an 8'InII circle. Since the light from the light emitting element 17 passes through the portion where there is no original on the original table glass 2, there is no output to the light receiving element 19.

原稿サイズ検知器16は発光素子17から出た光が原稿
台ガラス2の下面で反射してそのまま受光素子19に入
ることのないよう、発光素子および受光素子の光軸で形
成される面と原稿台ガラス2の下面の法線に対し第3図
に示すように20度傾いて取9つけられている。
The document size detector 16 is installed between the surface formed by the optical axes of the light emitting element and the light receiving element and the original so that the light emitted from the light emitting element 17 does not reflect off the lower surface of the document platen glass 2 and enter the light receiving element 19 as it is. The base glass 2 is installed at an angle of 20 degrees with respect to the normal to the lower surface of the base glass 2, as shown in FIG.

この角度が0度の場合には受光素子の出力は最大にはな
るが、その出力自体は原稿台ガラス2面で反射してくる
光であり、原稿台ガラス2の上に原稿があってもなくて
も出力は変化しない。したがって原稿サイズの検知には
用いることができない。この角度をしだいに大きくして
いくと受光素子19からの出力は低くなるが、原稿台ガ
ラス2の上面に原稿の有無で出力に差が生ずるようにな
り10度以上傾けると原稿のない場合はOVある場合は
8v程度の出力が出るようになる。さらに傾けて30度
以上傾けると原稿のない場合はOVある場合8vからし
だいに下る。この結果本発明の実施例ではこの傾きの角
度を20度が最適としている。
When this angle is 0 degrees, the output of the light-receiving element is maximum, but the output itself is light reflected by the two surfaces of the document glass platen, so even if there is an original on the document glass platen 2, Even if it is not there, the output will not change. Therefore, it cannot be used to detect the document size. As this angle is gradually increased, the output from the light-receiving element 19 will decrease, but the output will differ depending on whether there is an original on the top surface of the original platen glass 2, and if it is tilted more than 10 degrees, the If OV is present, an output of about 8v will be output. If you tilt it further by more than 30 degrees, it will gradually drop from 8v if there is no document or if there is OV. As a result, in the embodiment of the present invention, the optimum angle of inclination is 20 degrees.

上記の説明のように原稿サイズ検知器16は原稿台ガラ
ス20面に対してかだむいて取9つけられているが、第
4図に示す23,24,25,26の位置に発光素子1
7および受光素子19の焦点位置がくるように4個配置
され、日本国内で使用されるム3.ム4.B4.B5お
よびム4とB6の横置きの区別をするようにしている。
As described above, the document size detector 16 is mounted 9 overhanging the surface of the document table glass 20, and the light emitting elements 1 are located at positions 23, 24, 25, and 26 shown in FIG.
7 and the light receiving element 19 are arranged in such a way that the focal positions of the light receiving elements 19 and 3. M4. B4. A distinction is made between B5, Mu4, and B6 when placed horizontally.

説明簡略化のため、第4図23.24,25゜26に焦
点のくる原稿サイズ検知器の番号をそのまま23,24
,25,26と呼ぶ。
To simplify the explanation, the numbers 23, 24 of the document size detectors that are in focus are the same as those shown in Figure 4, 23, 24, 25, and 26.
, 25, 26.

第6図にそれぞれの原稿サイズに対応して出力信号で出
る検知器を○印、出ない検知器をX印で示す。このOと
X印の組合せでム3.ム4.Ba。
In FIG. 6, the detectors that produce output signals are marked with ○, and the detectors that do not produce signals are marked with X, corresponding to each document size. With this combination of O and X marks, 3. M4. Ba.

B6およびム4.B6のたてと横を区別することができ
る。
B6 and Mu4. You can distinguish between the vertical and horizontal sides of B6.

第6図は複写機本体1の側面図であり、原稿台ガラス2
を覆うようにヒンジ27を支点にして開閉できるように
なっている原稿台カバー3には下面に白色の原稿押えシ
ート28が貼付されている。
FIG. 6 is a side view of the copying machine main body 1, and the original platen glass 2
A white document holding sheet 28 is attached to the lower surface of the document table cover 3, which can be opened and closed using a hinge 27 as a fulcrum.

また、複写機本体1には原稿台カバー3を完全に閉じた
とき作動する。スイッチ29と原稿台カバー3を原稿台
ガラス面から30°開いたときヒンジ27の一端で押圧
されるスイッチ30とがある。
Further, the copying machine main body 1 operates when the document table cover 3 is completely closed. There are a switch 29 and a switch 30 that is pressed at one end of the hinge 27 when the document table cover 3 is opened 30 degrees from the document table glass surface.

原稿台ガラス2の上に例えばB4のサイズの原稿を置い
てサイズを検出する場合について説明する。
A case will be described in which, for example, a B4 size document is placed on the document table glass 2 and its size is detected.

原稿台カバー3を開く。この状態では原稿サイズ検出器
23のみが作動している。原稿台ガラス2の上には何も
ないので複写機本体1は当然原稿なしとみる。次にB4
の用紙を置くと原稿サイズ検出器23,25,26が働
らき、実際にはそれぞれに原稿サイズ検出器から8vの
出力が出る。これに対し、原稿サイズ検出器24の出力
はOvである。本発明実施例では4vを紙検出のスレシ
ュホールドレベルとして設定しているので検出信号とし
ては第5図2段目のように原稿サイズ検出器23.25
.26に対して○となり、24は×となって用紙サイズ
が検知できる。
Open the document table cover 3. In this state, only the document size detector 23 is operating. Since there is nothing on the document table glass 2, the copying machine main body 1 naturally assumes that there is no document. Next B4
When a sheet of paper is placed, the original size detectors 23, 25, and 26 are activated, and an output of 8V is actually output from each original size detector. On the other hand, the output of the document size detector 24 is Ov. In the embodiment of the present invention, 4V is set as the threshold level for paper detection, so the detection signal is sent to the document size detector 23.25 as shown in the second row of FIG.
.. The paper size is detected as ○ for 26 and x for 24.

一般的な白い紙に細かい文字の書かれた原稿の場合には
これで原稿サイズを正しく検知できるが、丁度、原稿サ
イズ検出器26に相当する位置に黒い写真等があった場
合、原稿サイズ検出器26の出力は例えば2vとなシ、
出力は×となって86サイズを検知してしまう場合があ
る。これを解決するために本発明実施例ではスイッチ2
9および3oを設け、まず原稿台カバー3がガラス面か
ら30°まで閉じた段階で、それぞれの原稿サイズ検出
器の出力信号を読みとる。次に原稿台カバーを完全に閉
じてスイッチ29がはたらいたとき、もう一度それぞれ
の検出器の出力信号を読みとる。
In the case of a document with fine text written on regular white paper, the document size can be detected correctly with this method, but if there is a black photograph, etc. at the position corresponding to the document size detector 26, the document size will be detected. The output of the device 26 is, for example, 2V,
The output may be x and 86 size may be detected. In order to solve this problem, in the embodiment of the present invention, the switch 2
9 and 3o are provided, and when the document table cover 3 is closed to 30 degrees from the glass surface, the output signals of the respective document size detectors are read. Next, when the document table cover is completely closed and the switch 29 is activated, the output signals of each detector are read again.

先の84で原稿サイズ検出器26の部分に黒い写真のあ
る原稿の場合、第7図に示すようにまずスイッチ30が
はたらいたときには○×○×の組合せになり、次にスイ
ッチ29がはたらいたときには今までは原稿がないため
に×であった原稿サイズ検出器24は原稿台カバー3の
白いシート28を検出することになり○に変わる。それ
以外は原稿を読んでいるために変化しない。
In the case of the original with a black photo on the original size detector 26 in step 84, as shown in FIG. 7, when the switch 30 is activated first, the combination of ○×○× is obtained, and then the switch 29 is activated. In some cases, the original size detector 24, which until now was marked x because there was no original, detects the white sheet 28 on the original platen cover 3 and changes to ○. Other than that, nothing changes because I am reading the manuscript.

ここでスイッチ3oとスイッチ29とが作動した状態の
原稿サイズ検出器の出力信号を比較し、×から○に変っ
たところは元来原稿がなくガラス面を通して外をみてい
た箇所であることがわかる。
Here, by comparing the output signals of the document size detector with switch 3o and switch 29 activated, it can be seen that the areas where the mark changes from x to ○ are originally the areas where there was no document and the outside was looked through the glass surface. .

したがってこの原稿は原稿台カバー3を開いた状態では
B6サイズと誤まって検知していても最終的には正しい
B4サイズを検知できることになる。
Therefore, even if this document is mistakenly detected as B6 size when the document table cover 3 is open, the correct B4 size will eventually be detected.

本発明実施例では原稿のサイズを検知し、原稿サイズに
合せて自動的にそれに合ったコピー用紙を選択したり、
コピー用紙一定としておく場合には自動的に倍率を変換
して原稿全面がコピー用紙全面におさまるよう複写機光
学系の変倍入力を設定するようにしている。その用紙サ
イズ選択または倍率選択の動作は原稿台カバー3が完全
に閉じスイッチ29が作動したとき開始するようになっ
ている。
In the embodiment of the present invention, the size of the original is detected and the appropriate copy paper is automatically selected according to the original size.
When the copy paper is kept constant, the magnification is automatically changed and the magnification input of the optical system of the copying machine is set so that the entire surface of the document fits on the entire surface of the copy paper. The paper size selection or magnification selection operation is started when the document table cover 3 is completely closed and the switch 29 is activated.

ただし、厚物の本等をコピーする場合には、原稿台カバ
ー3は閉じないでコピーする。したがって、スイッチ2
9は閉じることはないので用紙サイズ選択あるいは倍率
選択等の動作に入らないことになる。本発明実施例では
スイッチ29が閉じないで複写機本体1のコピースター
トのスイッチが押されたときには、押された時点で原稿
サイズ検知器12から出ている信号で紙サイズを判断し
て用紙サイズ選択あるいは倍率選択の動作に入るように
している。
However, when copying a thick book or the like, copy without closing the document table cover 3. Therefore, switch 2
9 is never closed, so operations such as paper size selection or magnification selection cannot be started. In the embodiment of the present invention, when the copy start switch of the copying machine main body 1 is pressed without the switch 29 being closed, the paper size is determined based on the signal output from the document size detector 12 at the time the switch is pressed, and the paper size is determined. The selection or magnification selection operation is started.

コピー動作が終了しても原稿台カバー3を開くまでは、
同じ原稿サイズ判断を続ける。原稿台カバー3をいった
ん開くと再び前述したサイズ判断を行なうことになる。
Even after the copying operation is completed, until the document cover 3 is opened,
Continue to judge the same document size. Once the document table cover 3 is opened, the size determination described above will be performed again.

原稿台カバー3を開いたとき、まず原稿サイズ検出器2
3のみが作動していて原稿が置かれるかどうかを待って
おシ、原稿サイズ検出器23がはたらいてから残りの検
出器もはたらきだすようにしている理由は、1つには、
何個かの発光素子を常時作動状態にしておくことはこの
だめの余分な電力を消費することになることと、使用者
は原稿台カバー3を開いたまま機材を放置しておくこと
があるが一般に発光素子で複写機の寿命である6年程度
の寿命をもつ素子は非常に高価になるためこれに対応し
た長寿命の素子は原稿サイズ検出器23にのみ使用し、
残りの原稿サイズ検出器にはもっと寿命の短かい発光素
子を用いて複写機のコストを下げるようにしている。
When opening the document platen cover 3, the document size detector 2 first
One of the reasons why the remaining detectors start working after the original size detector 23 is activated and the original size detector 23 is activated is to wait until the original is placed.
Leaving several light-emitting elements in constant operation consumes extra power, and the user may leave the equipment unattended with the document platen cover 3 open. Generally, a light-emitting element with a lifespan of about 6 years, which is the lifespan of a copying machine, would be very expensive, so an element with a corresponding long lifespan is used only for the document size detector 23.
The remaining document size detectors use light emitting elements with shorter lifetimes to reduce the cost of the copying machine.

発明の効果 以上に詳述したように本発明によれば発光素子から出た
光が原稿面で反射して受光器に入って検知するようにし
、原稿台下面で反射した光は受光器には入らないように
するため複数個の検知器のそれぞれを傾けて取9つける
ようにしている。
Effects of the Invention As described in detail above, according to the present invention, the light emitted from the light emitting element is reflected from the surface of the document and enters the light receiver for detection, and the light reflected from the lower surface of the document table is not transmitted to the light receiver. To prevent them from entering, each of the multiple detectors is mounted at an angle.

このようにした結果、原稿サイズ検知はすべてそのメカ
ニズムが複写機本体内部に収められたことになり、コン
パクトかつ信頼性の高いものになる。また、その原稿サ
イズ検知の精度も高い。
As a result, all the mechanisms for detecting the document size are housed inside the main body of the copying machine, making it compact and highly reliable. Furthermore, the accuracy of document size detection is also high.

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

第1図は本発明の一実施例における複写機の概略断面図
、第2図、第3図は本発明の原稿サイズ検知器の断面図
、第4図は同検知器の配置図、第6図は同検知器の各原
稿サイズに対応した出力信号の対応図、第6図は原稿台
カバーの開閉を示す側面図、第7図は原稿台カバーの開
閉によシサイズ検知精度を高めた場合の出力信号の説明
図である。 1・・・・・・複写機本体、2・・・・・・原稿台ガラ
ス、3・・・・・・原稿台カバー、4・・・・・・原稿
、6・・・・・・光学系、16・・・・・・原稿サイズ
検知器、17・・・・・・発光素子、19・旧・・受光
素子、18.20・・・・・・レンズ、29゜30・・
・・・・スイッチ。
FIG. 1 is a schematic sectional view of a copying machine according to an embodiment of the present invention, FIGS. 2 and 3 are sectional views of a document size detector of the present invention, FIG. 4 is a layout diagram of the same detector, and FIG. The figure shows the correspondence of output signals corresponding to each document size of the detector, Figure 6 is a side view showing opening and closing of the document platen cover, and Figure 7 shows the case where size detection accuracy is increased by opening and closing the document platen cover. FIG. 2 is an explanatory diagram of an output signal of FIG. 1...Copier body, 2...Original platen glass, 3...Original platen cover, 4...Original, 6...Optics System, 16... Original size detector, 17... Light emitting element, 19 Old... Light receiving element, 18.20... Lens, 29°30...
····switch.

Claims (1)

【特許請求の範囲】[Claims] 複写機本体の原稿台ガラス下面を走査する光学系の下方
に原稿台ガラスに向けて光を照射するように設けられた
発光素子とレンズ、および原稿台ガラス面上の原稿から
反射してきた反射光を受光するための受光素子とレンズ
とよりなる原稿サイズ検知器の複数個を設け、上記発光
素子から出た光が原稿台ガラス下面で反射して上記受光
素子に入らないよう、上記発光素子および受光素子の光
軸で形成される面を上記ガラス面法線に対し10度乃至
30度傾けたことを特徴とする複写機原稿サイズ検知装
置。
A light-emitting element and a lens are installed below the optical system that scans the lower surface of the document glass of the copying machine to irradiate light toward the document glass, and reflected light reflected from the original on the document glass surface. A plurality of document size detectors each including a light-receiving element and a lens for receiving light are provided, and the light-emitting element and A copying machine document size detection device characterized in that a surface formed by an optical axis of a light receiving element is inclined by 10 degrees to 30 degrees with respect to the normal line of the glass surface.
JP60145553A 1985-07-02 1985-07-02 Copier Original size detector Expired - Lifetime JPH0612246B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60145553A JPH0612246B2 (en) 1985-07-02 1985-07-02 Copier Original size detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60145553A JPH0612246B2 (en) 1985-07-02 1985-07-02 Copier Original size detector

Publications (2)

Publication Number Publication Date
JPS626105A true JPS626105A (en) 1987-01-13
JPH0612246B2 JPH0612246B2 (en) 1994-02-16

Family

ID=15387831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60145553A Expired - Lifetime JPH0612246B2 (en) 1985-07-02 1985-07-02 Copier Original size detector

Country Status (1)

Country Link
JP (1) JPH0612246B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04231669A (en) * 1990-06-26 1992-08-20 Mercedes Benz Ag Cylinder head for internal combustion engine
EP0578235A2 (en) * 1992-07-10 1994-01-12 Sharp Kabushiki Kaisha Document-size detection system for use in a document reader
JPH0989769A (en) * 1995-09-22 1997-04-04 Sharp Corp Toner concentration sensor
JPH1062340A (en) * 1996-08-20 1998-03-06 Sharp Corp Toner density sensor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5710172A (en) * 1980-06-20 1982-01-19 Ricoh Co Ltd Original size detecting method of copying machine
JPS601527A (en) * 1983-06-20 1985-01-07 Fuji Xerox Co Ltd Photosensor
JPS6027308U (en) * 1983-07-29 1985-02-23 ミノルタ株式会社 Roll paper detection device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6027308B2 (en) * 1981-11-26 1985-06-28 ブラザー工業株式会社 sewing machine feed device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5710172A (en) * 1980-06-20 1982-01-19 Ricoh Co Ltd Original size detecting method of copying machine
JPS601527A (en) * 1983-06-20 1985-01-07 Fuji Xerox Co Ltd Photosensor
JPS6027308U (en) * 1983-07-29 1985-02-23 ミノルタ株式会社 Roll paper detection device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04231669A (en) * 1990-06-26 1992-08-20 Mercedes Benz Ag Cylinder head for internal combustion engine
EP0578235A2 (en) * 1992-07-10 1994-01-12 Sharp Kabushiki Kaisha Document-size detection system for use in a document reader
EP0578235A3 (en) * 1992-07-10 1995-10-25 Sharp Kk Document-size detection system for use in a document reader
US5519483A (en) * 1992-07-10 1996-05-21 Sharp Kabushiki Kaisha Detection system and detection method of document size for use in a document reader
JPH0989769A (en) * 1995-09-22 1997-04-04 Sharp Corp Toner concentration sensor
JPH1062340A (en) * 1996-08-20 1998-03-06 Sharp Corp Toner density sensor

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