JPS58102258A - Copying device - Google Patents

Abstract

PURPOSE:To permit sharp copying even in the case of copying thick books or the like by detecting the distance from a predetermined reference plate up to an original picture plane optically and controlling the scanning speed for an original in accordance with the distance information thereof. CONSTITUTION:In a copying device which exposes and scans the original placed on an original plate 1 with the light from a light source 2 and forms images by conducting the reflected light from the original surface to a photosensitive drum 7, a half mirror 6 which reflects part of the light received in the mid-way of the optical path to the drum 7 and transmits the balance is provided and the light reflected by the mirror 6 is received in a photoelectric element 8 which is a phtoelectric cell or the like. Since the resistance value of the lement 8 changes according to the received quantity of light, the change in the quantity of light including the picture information of the original is informed electrically as the distance information between the original and the reference plane to control the scanning speed of the original in accordance with the distance information.

Description

【発明の詳細な説明】 本発明は書籍などのよう−厚みがあって原稿台に密着し
ない部分のある原稿でもゆがみのない鮮明な１１寥Ｉｌ
像が得られるようにした複写装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a clear 11-page image without distortion, even when a document, such as a book, is thick and has parts that do not come into close contact with the document table.
The present invention relates to a copying apparatus capable of obtaining an image.

電子写真ＩＩ写機においては、原稿台上に記録すべき原
稿を載置し、原稿台を移動するか光学走査系を移動して
原稿を光源で照射しながら走査し、原稿からの反射光を
感光体上に投射して感光体上に原稿の静電潜像を形成し
、トナー【含む現像剤により静電潜像を現像して可視像
とし、これを記録紙に転写し、定着してＩＩＩ写−替を
得ている。原稿台上の原稿載置面から膵光体！！１面ま
での距離は予め定められており、原稿載置面は基準面と
なっていてこの基準［ｏＫ原稿を密着して載置すれは感
光体上ＩｆＣ原稿の反射像が結像し鮮明なＩＩ写両画像
得られるよう罠なっている。In an electrophotographic II copying machine, the document to be recorded is placed on the document table, and the document is scanned while being irradiated with a light source by moving the document table or moving the optical scanning system to capture the reflected light from the document. An electrostatic latent image of the document is formed on the photoconductor by projecting it onto the photoconductor, and the electrostatic latent image is developed into a visible image using a developer containing toner, which is transferred to recording paper and fixed. I have obtained a copy of III. Pancreatic light body from the manuscript placement surface on the manuscript table! ! The distance to the first surface is predetermined, and the document placement surface serves as a reference surface. It is a trap to obtain both images.

ところが、書籍などのような厚みのある１ｅｉ（以下「
ブックもの」という）を複写する場合は、プツタものの
綴じ部は原稿載置面上に密着せずにやや浮き上った状態
になりしかも原稿面が曲面状になるので綴じ部近くの原
稿部分においては原Ｓ陶像と走査速度との相対速度が密
着した原稿部分における相対連１と興なってしまうため
に１像の走査方向に縮みが生じたり、−像が流れたり、
ゆがんだりして記録＃鎗が非常にみにくくなり、文字の
場合は読みＫ＜＜なったり判読不能になるという同順が
あるが、従来このような問題を解決する対策は特に構じ
られていなかった。However, a thick 1ei (hereinafter referred to as "
When copying a book (referred to as a "book"), the binding part of a putty book does not stick tightly to the document placement surface and is slightly raised, and the document surface becomes curved, so it is difficult to copy the part of the document near the binding part. Because the relative speed between the original S-ceramic image and the scanning speed is different from the relative speed of the original image in the closely-contact portion of the document, shrinkage occurs in the scanning direction of one image, or the image moves.
The records are distorted and become very hard to look at, and in the case of letters, they become readable or illegible, but no particular measures have been taken to solve these problems in the past. Ta.

本発明は光源により照射される原稿画像面の＃１１ｆが
光源からの距１１１により変化することに着目し、上記
問題を解決するため、予め定めた基準面から原稿−像面
までの距離を光学的に検知し、その距離に基づいて原稿
走−査速度を制御するようＫしたものである。The present invention focuses on the fact that #11f of the original image surface irradiated by the light source changes depending on the distance 111 from the light source, and in order to solve the above problem, the distance from the predetermined reference plane to the original image surface is optically calculated. The document scanning speed is controlled based on the detected distance.

以下ＷＪ面に基づいて本発明を説明する。The present invention will be explained below based on the WJ plane.

第１図は本発明によるＩＩ寥装置の光学走査系の一実施
飼の概略構成を示”しており、１は原稿を載置する原稿
台、２は原稿照射用光源、３゜４は反射鏡、５はレンズ
、６は受けた光の一部を反射し残りを透過するハーフミ
ラ−１７は感光体ドラ＾、８はハーフミラ−６により反
射された光を受け６Ｃｄｓ光導電セルなどの光電素子で
あ６ｏなお、光源２は照射画像の走査方向での明るさの
かたよりをなくすために光源ランプを２つ用い明るさの
均一化を図るのがよい。第２図は光学走査系の他の実施
例を示し、第１図に示した反射鏡４とハーフミラ−６と
の代りに受けた光の一部を透過し残りを反射するハーフ
濁う−６′を用い、このハーフミラ−Ｃの透過光を光電
素子８により検知すａｏその際光電素子８の、受光面は
レンズ６により結像する位置付近に設けるようＫした方
がよいことはもちろんである。上記いずれの実施ｆｐ４
においても、光電素子ＩＫはＣｄｓ光導電セルのはかに
ホ））ランジスタを用いることができる。光電素子８は
受ける光量に応じて抵抗値が変化するので、ＩＱ槁−像
情報を含む光の光量変化を原稿と基準面との距離情報と
して電気的に取り出すことができ６゜ここで重要なこと
は、距離情報を取り出ｔａｌ１１部分からの光量が原稿
画像の内容によって影響されず且つ走査基準面から原稿
−像までの距離が零のときすなわち原稿が原稿載置面に
￥！！看しているときは常に同じ出力になるようＫする
ことである。このため、光電素子８は、一段印刷のブッ
クものの場合は走査方向に伸びるように載置した状態の
周辺部で印刷のない部分に１また二段印刷のブックもの
の場合はこの部分に加えて中央部の印刷のない部分に対
応した位置゛に受光面を配置しぞもよいＯこわらの受光
面は予め定めた上記のような位置に設置してもよいが、
使用者がブックものの内容に応じて任意に選べるように
してもよい。FIG. 1 shows a schematic configuration of an optical scanning system of a second device according to the present invention, in which 1 is a document table on which a document is placed, 2 is a light source for irradiating the document, and 3 and 4 are reflection lights. A mirror, 5 is a lens, 6 is a half mirror that reflects a part of the received light and transmits the rest, 17 is a photoreceptor drum, 8 is a photoelectric element such as a 6Cds photoconductive cell that receives the light reflected by the half mirror 6. In order to eliminate uneven brightness in the scanning direction of the irradiated image, it is preferable to use two light source lamps for the light source 2 to equalize the brightness.Figure 2 shows other optical scanning systems. An embodiment is shown in which a half mirror 6' that transmits a part of the received light and reflects the rest is used in place of the reflecting mirror 4 and half mirror 6 shown in FIG. Of course, when light is detected by the photoelectric element 8, it is better to arrange the light-receiving surface of the photoelectric element 8 near the position where the image is formed by the lens 6.
Also, the photoelectric element IK can be a transistor of the Cds photoconductive cell. Since the resistance value of the photoelectric element 8 changes depending on the amount of light it receives, changes in the amount of light containing IQ information can be electrically extracted as distance information between the original and the reference surface. This means that when the distance information is extracted and the light amount from the tal11 portion is not affected by the content of the original image and the distance from the scanning reference plane to the original image is zero, that is, the original is placed on the original placing surface! ! The key is to set the K so that the output is always the same when you are watching. For this reason, in the case of a book with one-stage printing, the photoelectric element 8 is placed in the unprinted area at the periphery of the book placed so as to extend in the scanning direction, and in the case of a book with two-stage printing, in addition to this area, the photoelectric element 8 is placed in the center. The light-receiving surface should be placed at a position corresponding to the unprinted portion of the copy.The light-receiving surface of the photocopy may be placed at a predetermined position as described above.
The user may be able to arbitrarily select one depending on the content of the book.

さて、このような位置く設けた光電素子から出力される
走査基準面から原稿画像までの距離情報に基づいて原稿
の走査速度を調整するわけであるか、以下にこの連＃Ｌ
ＩｌＩ整の原珈について説明する。Now, the scanning speed of the original is adjusted based on the distance information from the scanning reference plane to the original image outputted from the photoelectric element installed at such a position.
I will explain the origin of IlI adjustment.

第３図は原稿台１上にブックものの原稿１０を載置した
場合の様子を示しており、点０は原稿１０と原稿台ｌと
が密着してい６部分、点Ｐは原稿ＩＯが原稿台１の原稿
載置面からある程度浮き上ってい６部分、点Ｑは原稿１
０が原稿載置面からさらに浮き上ってい６部分にそれぞ
れある。いま、原稿台移動式（移動１Ｍ度をマとする）
の電子写真複写＠について考えてみると、点Ｏにおいて
は、原稿１０が原稿台ｌの原稿載置面に１！着している
ので、この点０における距離情報すなわち原稿１０と原
稿台１との間の距離りはＯであり、原稿ｌＯの移動速度
をまＹであ６・ところが、点Ｐにおける距離情報をｈｐ
とし点Ｐにおける原稿ｌＯへの接線が原稿台ｌの原稿載
置面となす角を０Ｐとすると、点Ｐの叛紳力゛向速度マ
ｒは次式で表わせる。FIG. 3 shows the situation when a book manuscript 10 is placed on the manuscript table 1. Point 0 shows 6 parts where the manuscript 10 and manuscript table L are in close contact with each other, and point P shows that the manuscript IO is in close contact with the manuscript table L. 6 parts that are raised to some extent from the document placement surface of No. 1, point Q is the original No. 1
0 is located in each of the six areas that are further raised from the document placement surface. Currently, the manuscript table is movable (1M degree of movement is assumed)
Considering electrophotographic copy @, at point O, the original 10 is placed 1! on the original placement surface of the original platen L. Therefore, the distance information at this point 0, that is, the distance between the document 10 and the document table 1, is O, and the moving speed of the document 10 is Y6. However, the distance information at point P is HP
Assuming that the angle between the tangent to the document lO at point P and the document placement surface of the document table l is 0P, the deflection force and directional velocity r at point P can be expressed by the following equation.

ｖ１？７ 同様に点Ｑにおける距離情報をｈＱＳ点ＱＫお番す６原
稿ｌＯへの接線か原稿台ｌの原稿載置面となす角を０９
とすると、点Ｑの接線方向達［ｖｇ　４１次式で表わせ
る。v1?7 Similarly, the distance information at point Q is given to hQS point QK. 6 The angle formed by the tangent to document lO or the document placement surface of document table l is 09
Then, the tangential direction of point Q [vg can be expressed by the 41st equation.

ｖＱ”’；””ａτ 光電素子８から出力される距離情報ｈ（ま連続したアナ
ログＩであり、この距離情報ｈＫＮ応して角０が一銭的
に定まるので、一般的に原稿１０上の任意の点Ｘにおけ
！１綻接線向ｍ［ｖｘＧま次式で表わせる。vQ"';""aτ Distance information h (or continuous analog I) output from the photoelectric element 8, and this distance information hKN corresponds to the angle 0 being determined on the order of one yen. At any point X, the tangent direction m[vxG can be expressed as follows.

”−一、・・・・・・・・・・・・（１）すでに説明し
たように、ブックものの原稿の綴じ部で画像が縮んだり
、流れたり、ゆがんだりするのは、上式（１）　におい
てＶＺ）Ｖとなるためである・そこでＶ’！　、、　Ｖ
となるような原稿台移動速度Ｖ′を求めると、 マ’　＝　ｖｚａｍ＃　Ｗ　ｖｃｍ＃　　”′。川（２
）とな６・０は距離情報りから一義的に定まるので、上
式（２）から原稿台の移動速度がＶ′となるように制御
すればよい・ ところで、１ｌ−９０°に対してはｈは無限大となるが
、このような事態は実際上前えられず画像が形成できな
い。また、距離情報りもある最大値ｈ　ｍｓ＋ｘを定め
ておかないと原稿が載置されていない場合などに不都合
が生ずる。たとえば、原稿台上に原稿が記載されておら
ずしかも原稿押えカバーが拘ち上げられた状態で複写ボ
タンが押された場合には原稿台の上方にあるものまでｗ
ＩＩ写されてしまうおそれがあ６ｏそこで実際上はｈｍ
ａｘを、Ｔｏる値（たとえば１０　ｃｙｓ　）　Ｉ／ｃ
定めて□おき、ｈｍａｘ以上の距離情報データは取り込
まないようＫす６のがよい。距離情報りからθを求める
ＫはｔＩｈ４図のような単位円な考えれば、Ｖ′−マｅ
ｍ（５ｉｎ−μ」Ｌ→・・・・・・・・・（３）ｈ　１
１１ａｘ が得られる。（３）式の関係から、距離ｆｆＩＩ報りす
なわち、原稿の浮き上りの状態と原稿台の移動速度すな
わち原稿の走査速度との間係は第５図（イ）のようにな
るが、原稿台駆動源であるモータの追従特性などを考慮
するとシャープな変化は期待できず同図（りのようＫな
る。”-1, ・・・・・・・・・・・・(1) As already explained, the reason why the image shrinks, flows, or is distorted at the binding part of a book manuscript is due to the above formula (1) ) at VZ)V.Therefore, V'! ,, V
To find the platen moving speed V' such that
) and 6.0 is uniquely determined from the distance information, so from the above equation (2), it is only necessary to control the moving speed of the document table so that it becomes V'. By the way, for 1l-90°, Although h becomes infinite, such a situation cannot actually be prevented and an image cannot be formed. Further, unless a certain maximum value hms+x is determined for the distance information, inconveniences will occur when no document is placed. For example, if the copy button is pressed with no original written on the document table and the document presser cover is held up, the copy button will be copied to the document above the document table.
II There is a risk of being photographed 6o So in practice hm
ax to a value (for example, 10 cys) I/c
It is preferable to set the value □ and to avoid importing distance information data greater than hmax. If K, which calculates θ from distance information, is a unit circle as shown in the tIh4 diagram, then V'-mae
m(5in-μ”L→・・・・・・・・・(3) h 1
11ax is obtained. From the relationship in equation (3), the relationship between the distance ffII information, that is, the state of the floating document, and the moving speed of the document table, that is, the scanning speed of the document is as shown in Figure 5 (a). Considering the follow-up characteristics of the motor that is the driving source, a sharp change cannot be expected, and the result is as shown in the figure.

第６図は、本発明によ６１写肢置にお番ブる原稿の走査
速度制御回路の１０ツクＩＩ！図であり、１１はブック
もののｗＩ写をする際に操作する可変速キー、１２は原
稿台１の原稿載置面から原稿表面までの距離情報りを出
力する光ｍ素子、１３は距離情報りをデジタル信号に変
換すｉゆ変！Ｉ！器、’、１４は所定の演算式に従って
距離情報りから０を求め且つ上式（３）から原稿台の移
動速度Ｖ′を求める演算回路、１Ｂは演算回路ｘ４によ
り演算され出力される速度値ｖ′に基づいた速度で原稿
台を駆動する原稿台駆動回路である。FIG. 6 shows 10 parts II! of a scanning speed control circuit for an original document that can be read in 61 photo positions according to the present invention. In the figure, 11 is a variable speed key operated when copying books, 12 is an optical element that outputs distance information from the document placement surface of document table 1 to the surface of the document, and 13 is distance information. iyuhen that converts into digital signals! I! 14 is an arithmetic circuit that calculates 0 from the distance information according to a predetermined arithmetic expression and also calculates the moving speed V' of the document table from the above equation (3), and 1B is a speed value calculated and output by the arithmetic circuit x4. This is a document table drive circuit that drives the document table at a speed based on v'.

次にプツタものの原稿のｗＩ写動作について説明する。Next, the wI copying operation of a printed original will be explained.

通常の＊＊掃作に先立ち、まず可羨速中−１１を押す６
司変連キー１１を押すことにより、光電素子１２、昨変
換器１３、演算回路１４が動作状部となり、原稿台の移
動に伴ない原稿走査が始まると、充電素子１２からは距
離情報りが連続的に出力し、演算回路１４では速度ｖ′
の演算が行なわれる。原稿台駆動装置ＩＢはこの速度Ｖ
’に基づいて原稿台を移動する。この速度マＣは原稿台
スタート時の連［（すなわち、原稿が原稿台載ｌ１ｌｉ
Ｉ上に密着して載置され゛（°いるときの移動速度）マ
よりは小さくしかも原稿と原稿台載置面との距離が変化
すＥ、につれて変化するＯ このように原稿と原稿台載置面との距ＪＩＫ応じて原稿
台の移動速度を変えて原稿面上の実際の走査速度が％ｌ
ｌＣ鳳稿台スターシ時の速度になるようＫすることＫよ
り感光体上に投射される原稿画像の反射像が縮んだり、
流れたり、ゆがんだりすることがないようＫすにとがで
きるので、ブックものの原稿の綴じ部でもｍＶ動画像ゆ
がんだりすることなく密着部と同じような解明で読み易
−い画像が得られる。なお、上記実施例において、原稿
載置位置は受光面が固定している場合は端面合わせが好
ましいが、使用者で任意に設定できるような場合は端面
合わせでも中央会わせでもよい。Prior to normal sweeping, first press -11 in the middle of the speed range 6
By pressing the switching key 11, the photoelectric element 12, the transducer 13, and the arithmetic circuit 14 become active parts, and when the document scanning starts as the document table moves, distance information is output from the charging device 12. The arithmetic circuit 14 outputs the speed v' continuously.
calculations are performed. The document platen drive device IB maintains this speed V.
'Move the document glass based on '. This speed ma- c
The distance between the original and the original platen surface changes as the distance between the original and the original platen changes. The actual scanning speed on the document surface is changed by changing the moving speed of the document table according to the distance JIK from the placing surface.
If the speed of the original document image is adjusted to the same speed as when the copy table is starched, the reflected image of the original image projected onto the photoreceptor may shrink.
Since the K-stripes can be formed so as not to flow or distort, an easy-to-read image can be obtained with the same clarity and clarity as in the close-contact parts without mV moving image distortion even in the bound part of a book manuscript. In the above embodiments, it is preferable that the document placement position be edge-to-edge alignment when the light-receiving surface is fixed, but edge-to-edge alignment or center alignment may be used if the user can arbitrarily set the document placement position.

上記実施例は原稿台移動式の被写装置であるが、本発明
はこの型式のものに限らず原稿台は固定していて光学走
査系が移動する型式のものＫももちろん適用することが
できる。また、距離情報に応じて原稿台の移動速度を変
えるようＫするほか、同時に光源の明るさを変えたり光
学系を移動させて光路長を調整するようにしてもよい０
また、ブックものの原稿ｔ−ｍｖする場合だけキーを′
操作して原稿台の移動速１を１ｖＩＩＩｌｉＩするので
はなく、常に距離情報を求めそれに基づいて原稿台の移
動速度を制御するようＫしてもよい・ 以上説明したように、本発明においては、予め定めた基
準面から原稿画像ｒＩＩＪｔでの距離を光学的に検知し
、十゛の距離情報に基づいて原稿走査速度を制御ず６よ
うＫしたので、ブックもののような原稿を被写する場合
、原稿台から浮き上っている原稿部分も縮んだり、流れ
たり、ゆがんだりすることなく鮮明Ｋｔ１４写すること
ができ読み易い麹蓼−像が得られる。Although the above embodiment is a subject device with a movable document table, the present invention is not limited to this type, but can of course also be applied to a type K in which the document table is fixed and the optical scanning system is movable. . In addition to changing the moving speed of the document table according to the distance information, the optical path length may also be adjusted by simultaneously changing the brightness of the light source or moving the optical system.
In addition, the key '' is only used when t-mv a book manuscript.
Instead of operating to increase the moving speed 1 of the document table to 1vIIIliI, it is also possible to always obtain distance information and control the moving speed of the document table based on that information.As explained above, in the present invention, The distance of the original image rIIJt from a predetermined reference plane is optically detected, and the original scanning speed is not controlled based on the distance information, so when an original such as a book is to be photographed, Even parts of the original that are floating above the original table can be clearly copied without shrinking, blurring, or distortion, resulting in an easy-to-read Kt14 image.

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

第１図は本発明によるＩ！写装置の光学走査系の一実施
例の概略構成図、第２図は本発明＆Ｃよ′６複写装置の
光学走査系の他の実施例の概略構成図、第３図は原稿台
上に載置されたブックものの原稿に対する距離情報と原
稿走査速度との関係を説明する図、第４図は距離情報か
ら角度θを求めるための説明図、第５図は距離情報とＩ
Ｉ＠稿台の移動′Ｉ！！度とのｖ４係を示す図で、←）
は理論式に基づく図、幹）は実際の移ＩＪ速１を示す図
、＃！６図は本発明による複写装置の走査速度制御回路
のブロック１ｓ図であるＯ １・・・原稿台、２・・・ｌｌＸ−照射用光渥、３４・
・・反射鏡、ト・・レンズ、６・・・ハーフ（ラー、７
・・・感光体ドラム、８　＋　１２・・・光’ｌ　素子
、ｉ　ｏ・・・）’／りものの原稿、１１−・・司蛮途
キー、１３・・・Ａ／Ｄ変換−１１４・・・演算回路、
１５・・・原稿台駆動−１路。 ％許出願人　小西六写真工業株式会社 代理人　弁理士　鈴　木　弘　男FIG. 1 shows I! according to the present invention! FIG. 2 is a schematic diagram of another embodiment of the optical scanning system of the copying device according to the present invention; FIG. 3 is a schematic diagram of another embodiment of the optical scanning system of the copying device according to the invention; Figure 4 is an explanatory diagram for calculating the angle θ from distance information, and Figure 5 is a diagram for explaining the relationship between distance information and document scanning speed for a placed book manuscript.
I@Moving the draft table'I! ! This is a diagram showing the relationship between v4 and degree, ←)
is a diagram based on a theoretical formula, stem) is a diagram showing actual transfer IJ speed 1, #! FIG. 6 is a block diagram of the scanning speed control circuit of the copying apparatus according to the present invention.
...Reflector, To...Lens, 6...Half (Ra, 7)
... Photoreceptor drum, 8 + 12 ... Optical 'l element, i o ...)' / Vehicle manuscript, 11 - ... Control key, 13 ... A/D conversion - 114.・Arithmetic circuit,
15...Original table drive-1 path. Percentage Applicant Konishiroku Photo Industry Co., Ltd. Agent Patent Attorney Hiroo Suzuki

Claims (1)

【特許請求の範囲】[Claims] 所定位置に戟曹じ・た原稿を露光走査し、該原稿からの
反射光を用いて電子寥真処理により原稿の複写画像を形
成す１５＊写装置において、予め定めた基準面から原稿
までの距離を原稿走査しながら検出し距離情報として出
力する検出手段と、前記距離情報に基づいて原稿走査速
度を演算する演算手段と、ＷＬ稿走査達度を前記演算手
段により演算された連成に制御する走査速度制御手段と
を設けたことを特徴とす６１１写装置。In a 15* photocopying device that exposes and scans a document that has been placed in a predetermined position, and uses the reflected light from the document to form a copy image of the document through electronic photographic processing, the distance from a predetermined reference plane to the document is a detection means for detecting a distance while scanning a document and outputting it as distance information; a calculation means for calculating a document scanning speed based on the distance information; and controlling a WL document scanning performance based on the combination calculated by the calculation means. A 611 copying apparatus characterized in that it is provided with a scanning speed control means.