JPH0418304B2 - - Google Patents
Info
- Publication number
- JPH0418304B2 JPH0418304B2 JP57001399A JP139982A JPH0418304B2 JP H0418304 B2 JPH0418304 B2 JP H0418304B2 JP 57001399 A JP57001399 A JP 57001399A JP 139982 A JP139982 A JP 139982A JP H0418304 B2 JPH0418304 B2 JP H0418304B2
- Authority
- JP
- Japan
- Prior art keywords
- amount
- original
- reflected light
- leading edge
- predetermined value
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 24
- 238000012545 processing Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5025—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the original characteristics, e.g. contrast, density
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing For Electrophotography (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は複写装置における画像制御装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image control device in a copying machine.
複写装置における画像制御装置としては基準パ
ターンからの反射光量を検知し、それに応じて現
像バイアス電圧を制御するものが米国特許第
3438705号明細書により知られている。しかしこ
の複写装置では原稿の地肌濃度に関係なく現像バ
イアス電圧を制御するので、色紙や地肌の青いジ
アゾコピーのような色付き原稿を複写した場合コ
ピーの地肌汚れが生ずる。また原稿の所定部分か
らの反射光を検知してその最大値に応じて現像バ
イアス電圧を制御するものが特開昭53−95031号
公報により知られている。しかしこの装置では原
稿の一部からの反射光を検知するので、その部分
が濃いパターン、つまり通常の白色よりも濃い特
異な領域になつていた場合プアの再現が悪くな
る。また原稿からの反射光を検知する時間は原稿
を走査する時間だけかかり、コピースピードが遅
くなる。 An image control device in a copying machine that detects the amount of light reflected from a reference pattern and controls the developing bias voltage accordingly is disclosed in US Patent No.
It is known from specification No. 3438705. However, since this copying apparatus controls the developing bias voltage regardless of the background density of the original, when a colored original such as colored paper or a diazo copy with a blue background is copied, the background of the copy is stained. Further, there is known a device that detects reflected light from a predetermined portion of a document and controls the developing bias voltage according to the maximum value thereof, as disclosed in Japanese Patent Laid-Open No. 53-95031. However, since this device detects the reflected light from a part of the document, if that part has a dark pattern, that is, a unique area darker than normal white, the poor reproduction will be poor. Furthermore, the time required to detect the reflected light from the original is equal to the time required to scan the original, which slows down the copying speed.
本発明は上記のような欠点がなくてどんな原稿
でも忠実に再現することができ、安価な画像制御
装置を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive image control device that is free from the above-mentioned drawbacks and can faithfully reproduce any original.
この目的を達するため、本発明は、原稿を走査
手段により走査して複写する複写装置において、
前記走査手段により原稿の走査に先立つて走査さ
れる基準反射部と、該基準反射部及び原稿の先端
部からの反射光量を検知する検知手段と、該検知
手段によつて検知された基準反射部からの反射光
量に基づいて複写条件を設定する第１の制御手段
と、前記検知手段によつて検知された原稿の先端
部からの反射光量に基づいて複写条件を設定する
第２の制御手段と、前記検知手段によつて検知さ
れた基準反射部と原稿の先端部とからの反射光量
の差が所定値以上かもしくは所定値以下かを検出
する検出手段と、該検出手段の検出結果により前
記反射光量の差が所定値以下のときには前記原稿
の先端部を地肌と認識し前記第２の制御手段によ
つて複写条件を設定させ、前記反射光量の差が所
定値以上のときには前記原稿の先端部からの反射
光量に基づかない前記第１の制御手段によつて複
写条件を設定させる選択手段とを備えものであ
る。 In order to achieve this object, the present invention provides a copying apparatus that scans and copies an original using a scanning means.
a reference reflecting section scanned by the scanning means prior to scanning the original; a detecting means for detecting the amount of reflected light from the reference reflecting section and the leading edge of the original; and a reference reflecting section detected by the detecting means. a first control means for setting copying conditions based on the amount of light reflected from the leading edge of the document; and a second control means for setting the copying conditions based on the amount of light reflected from the leading edge of the document detected by the detection means. , a detection means for detecting whether the difference in the amount of reflected light from the reference reflecting portion detected by the detection means and the leading edge of the document is above a predetermined value or below a predetermined value; When the difference in the amount of reflected light is less than a predetermined value, the leading edge of the document is recognized as the background, and the second control means sets copying conditions, and when the difference in the amount of reflected light is more than a predetermined value, the leading edge of the document is recognized as the background. and selecting means for causing the first control means to set copying conditions not based on the amount of light reflected from the copying section.
第１図は本発明を応用した複写装置の一例を示
す。 FIG. 1 shows an example of a copying apparatus to which the present invention is applied.
基準白色板１は基準反射部を構成するもので、
原稿載置台２上の原稿３より右側に配置されて原
稿載置台２の端部に取付けられる。光源４、第１
ミラー５及び第２ミラー６により構成される走査
装置が露光時に駆動装置により初期位置から左方
向へ一定の速度で駆動されることにより基準白色
板１及び原稿３の走査が順に行なわれ、光源４が
基準白色板１及び原稿３を順に照明して行つてそ
の反射光が第１ミラー５、第２ミラー６、スルー
レンズ７、第３ミラー８、第４ミラー９を経由し
て感光体ドラム１０及び検知器１１に入射する。
この検知器１１は基準白色板１及び原稿３からの
反射光量を検知する検知手段を構成している。感
光体ドラム１０は駆動装置により回転駆動されて
帯電用コロナ放電器１２により一様に帯電された
後に除電ランプ１３により画像非形成部が除電さ
れ、上述の如く原稿画像が露光されて潜像が形成
される。この潜像は現像スリーブ１４を有する現
像器１５により現像され、給紙装置からレジスト
ローラ１６を介して給送された転写紙Ｐは転写用
コロナ放電器１７により感光体ドラム１０上の画
像が転写されて分離用コロナ放電器１８により感
光体ドラム１０から分離される。この転写紙Ｐは
定着器で画像が定着されて外部にコピーとして排
出され、また感光体ドラム１０は転写紙分離後に
クリーニングブレード１９により清掃され除電ラ
ンプ２０により除電されて次の複写に備える。 The reference white plate 1 constitutes a reference reflection section,
It is placed on the right side of the document 3 on the document platform 2 and attached to the end of the document platform 2 . Light source 4, first
During exposure, the scanning device composed of the mirror 5 and the second mirror 6 is driven by a drive device from the initial position to the left at a constant speed, so that the reference white plate 1 and the original 3 are sequentially scanned, and the light source 4 illuminates the reference white plate 1 and the original 3 in order, and the reflected light passes through the first mirror 5, the second mirror 6, the through lens 7, the third mirror 8, and the fourth mirror 9, and then reaches the photosensitive drum 10. and enters the detector 11.
This detector 11 constitutes a detection means for detecting the amount of reflected light from the reference white plate 1 and the original 3. The photosensitive drum 10 is rotationally driven by a driving device and uniformly charged by a charging corona discharger 12, and then the non-image forming area is neutralized by a static eliminating lamp 13, and as described above, the original image is exposed and a latent image is formed. It is formed. This latent image is developed by a developing device 15 having a developing sleeve 14, and the image on the photoreceptor drum 10 is transferred by a transfer corona discharger 17 to a transfer paper P fed from a paper feeding device via a registration roller 16. and is separated from the photoreceptor drum 10 by a separating corona discharger 18. The transfer paper P has an image fixed thereon by a fixing device and is discharged as a copy to the outside.After the transfer paper is separated, the photosensitive drum 10 is cleaned by a cleaning blade 19 and neutralized by a charge removal lamp 20 in preparation for the next copy.
第２図は本発明の一実施例を示す。 FIG. 2 shows an embodiment of the invention.
スキヤナー位置検出器２１は上記複写装置にお
いて光学系４〜６が基準白色板１を走査する位置
にあることを検出するものであり、その検出信号
S4が入出力ポート２２を介して中央処理装置２３
に入力される。上記検知器１１の出力信号S1はア
ナログ／デジタル変換器２４でデジタル信号S2に
変換されて入出力ポート２２を介して中央処理装
置２３に送られる。中央処理装置２３はスキヤナ
ー位置検出器２１からの信号S4により基準白色板
１が光学系４〜６で走査されていることを知り、
基準白色板１の反射光量F0に対応するデジタル
信号S2を読みこんでメモリ２５（又は内部レジス
タ）に記憶させる。その後、中央処理装置２３は
光学系４〜６が原稿３の先端部３ａを走査する時
間をスキヤナー位置検出器２１からの信号S4によ
り知り、原稿３の先端部３ａの反射光量F1に対
応するデジタル信号S2を読みこんでメモリ２５に
記憶しておいた基準白色板１の反射光量F0に対
応するデジタル信号と比較し、その結果からプロ
グラムにより被制御対象（現像バイアス電圧）制
御信号を作つてこの制御信号を入出力ポート２２
を介して現像バイアス電源２６へ出力する。現像
バイアス電源２６はその制御信号に応じた現像バ
イアス電圧を現像器１５の現像スリーブ１４に印
加する。この場合第１及び第２の制御手段として
の中央処理装置２３は
F1＜F0−f0
f0：任意の光量
であるときには第１の制御手段中央処理手段２３
により現像バイアス電圧はF0に応じて設定し、
F1≧F0−f0
であるときには第２の制御手段としての中央処理
手段２３により現像バイアス電圧はF1に応じて
設定する。このため、中央処理装置２３は基準白
色板１からの反射光量に基づいて複写条件（現像
バイアス電圧）を設定することで画像濃度を制御
する２つの制御手段と、基準白色板１と原稿３の
先端部とからの反射光量の差が所定値以上かもし
くは所定値以下かを検出する検出手段と、この検
出手段の検出結果により上記２つの制御手段のい
ずれかを選択する選択手段とを有することにな
る。従つて原稿の先端部に濃いベタ部（例えば
ID＞１）があつた場合F1＜F0−f0となり、現像
バイアス電圧はF0に対応した値に設定されてプ
アの再現が悪くならない。通常の白紙を使用した
原稿や色紙、地肌が青いジアゾコピーのような色
付き原稿を複写する場合F1≧F0−f0となつて現像
バイアス電圧はF1に対応した値に設定され、コ
ピーの地肌汚れが生じない。 The scanner position detector 21 detects that the optical systems 4 to 6 are in the position to scan the reference white plate 1 in the copying apparatus, and receives the detection signal.
S 4 connects to the central processing unit 23 via the input/output port 22
is input. The output signal S 1 of the detector 11 is converted into a digital signal S 2 by the analog/digital converter 24 and sent to the central processing unit 23 via the input/output port 22 . The central processing unit 23 learns from the signal S4 from the scanner position detector 21 that the reference white plate 1 is being scanned by the optical systems 4 to 6, and
A digital signal S 2 corresponding to the amount of reflected light F 0 of the reference white plate 1 is read and stored in the memory 25 (or internal register). Thereafter, the central processing unit 23 learns the time during which the optical systems 4 to 6 scan the leading edge 3a of the original 3 from the signal S4 from the scanner position detector 21, and corresponds to the reflected light amount F1 of the leading edge 3a of the original 3. The digital signal S 2 is read in and compared with the digital signal corresponding to the amount of reflected light F 0 of the reference white plate 1 stored in the memory 25, and based on the result, the control signal for the controlled object (developing bias voltage) is determined by the program. and send this control signal to input/output port 22
It is output to the developing bias power supply 26 via. The developing bias power supply 26 applies a developing bias voltage to the developing sleeve 14 of the developing device 15 in accordance with the control signal. In this case, the central processing unit 23 as the first and second control means is F 1 <F 0 −f 0 f 0 : When the amount of light is arbitrary, the first control unit central processing unit 23
Therefore, the developing bias voltage is set according to F 0 , and when F 1 ≧F 0 −f 0 , the developing bias voltage is set according to F 1 by the central processing means 23 serving as the second control means. For this reason, the central processing unit 23 has two control means that control the image density by setting copying conditions (developing bias voltage) based on the amount of light reflected from the reference white plate 1, and a It has a detection means for detecting whether the difference in the amount of light reflected from the tip is greater than or equal to a predetermined value or less than a predetermined value, and a selection means for selecting one of the above two control means based on the detection result of the detection means. become. Therefore, there may be dark solid areas (for example,
When ID>1), F 1 <F 0 −f 0 and the developing bias voltage is set to a value corresponding to F 0 so that poor reproduction does not deteriorate. When copying a colored original such as an original using normal white paper, colored paper, or a diazo copy with a blue background, F 1 ≥ F 0 − f 0 , and the developing bias voltage is set to a value corresponding to F 1 , and the copying Does not cause skin stains.
なお基準反射部は必ずしも白色でなくてもよ
く、灰色等でもよい。また光学系４〜６を固定し
て原稿載置台２を移動させることにより基準白色
板１及び原稿３を走査するようにしてもよく、被
制御対象は露光量等でもよい。 Note that the reference reflective portion does not necessarily have to be white, and may be gray or the like. Alternatively, the reference white plate 1 and the original 3 may be scanned by fixing the optical systems 4 to 6 and moving the original table 2, and the object to be controlled may be the exposure amount or the like.
以上のように本発明によれば走査手段により原
稿の走査に先立つて走査される基準反射部と、該
基準反射部及び原稿の先端部からの反射光量を検
知する検知手段と、該検知手段によつて検知され
た基準反射部からの反射光量に基づいて複写条件
を設定する第１の制御手段と、前記検知手段によ
つて検知された原稿の先端部からの反射光量に基
づいて複写条件を設定する第２の制御手段とを有
し、これらのいずれかを選択手段により選択的に
作動させるので、画像濃度を制御するために濃度
検知をすべき領域を、基準反射部及び原稿の先端
部に限定することができ、画像濃度を制御するた
めの濃度検知速度を速くすることができ、コスト
もほぼ従来と同様に安価にできる。しかも、前記
検知手段によつて検知された基準反射部と原稿の
先端部とからの反射光量の差が所定値以上かもし
くは所定値以下かを検出する検出手段を備え、該
検出手段の検出結果により前記選択手段で、前記
反射光量の差が所定値以下のときには前記原稿の
先端部を地肌と認識し前記第２の制御手段によつ
て複写条件を設定させ、前記反射光量の差が所定
値以上のときには前記原稿の先端部からの反射光
量に基づかない前記第１の制御手段によつて複写
条件を設定させるので、前記反射光量の差が所定
値以下のときには第２の制御手段によつて、色
紙、地肌が青いジアゾコピーのような色付き原稿
でもコピーの地肌汚れが生じないようにでき、か
つ前記反射光量の差が所定値以上の特異な領域で
あるときには基準反射部からの反射光量に基づい
て第１の制御手段によつて、濃度検知をすべき領
域が、原稿上の黒ベタ等の特異な領域になつても
プアの再現が悪くならない。したがつて、検出し
た検出結果により、原稿の先端部が地肌か濃いベ
タ部の特異な領域かが判断でき、それに応じた制
御ができるため、原稿の先端部を検知するだけで
どんな原稿でも忠実に再現することができる。 As described above, according to the present invention, the reference reflecting section is scanned by the scanning means prior to scanning the original, the detecting means detects the amount of reflected light from the reference reflecting section and the leading edge of the original, and the detecting means a first control means for setting copying conditions based on the amount of light reflected from the reference reflecting portion detected by the detection means; and a first control means for setting copying conditions based on the amount of light reflected from the leading edge of the document detected by the detection means. and a second control means for setting, and any one of these is selectively activated by the selection means, so that the area where density detection is to be performed in order to control the image density is determined from the reference reflecting part and the leading edge of the document. The density detection speed for controlling the image density can be increased, and the cost can be reduced to almost the same as the conventional method. Furthermore, the detection means includes a detection means for detecting whether the difference in the amount of reflected light from the reference reflecting portion detected by the detection means and the leading edge of the document is greater than or equal to a predetermined value or less than a predetermined value, and the detection result of the detection means is provided. Accordingly, when the difference in the amount of reflected light is less than a predetermined value, the selection means recognizes the leading edge of the document as the background, and the second control means sets copying conditions, so that the difference in the amount of reflected light is equal to or less than a predetermined value. In this case, the first control means sets the copying conditions not based on the amount of light reflected from the leading edge of the document, so when the difference in the amount of reflected light is less than a predetermined value, the second control means sets the copying conditions. , it is possible to prevent background stains from occurring even in colored originals such as colored paper or diazo copies with a blue background, and when the difference in the amount of reflected light is in a unique area where the difference in the amount of reflected light is greater than a predetermined value, the amount of reflected light from the reference reflecting section is changed. Based on this, the first control means prevents poor reproduction from deteriorating even if the area to be subjected to density detection is a peculiar area such as a solid black area on the document. Therefore, based on the detection results, it is possible to determine whether the leading edge of the document is a background or a unique area such as a dark solid area, and control can be performed accordingly. can be reproduced.
第１図は複写装置の一例を示す断面図、第２図
は本発明の一実施例を示すブロツク図である。
１……基準白色板、１１……検知器、２１……
スキヤナー位置検出器、２２……入出力ポート、
２３……中央処理装置、２４……アナログ／デジ
タル変換器、２５……メモリ、２６……現像バイ
アス電源。
FIG. 1 is a sectional view showing an example of a copying apparatus, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1... Reference white plate, 11... Detector, 21...
Scanner position detector, 22... input/output port,
23...Central processing unit, 24...Analog/digital converter, 25...Memory, 26...Development bias power supply.
Claims (1)
装置において、前記走査手段により原稿の走査に
先立つて走査される基準反射部と、該基準反射部
及び原稿の先端部からの反射光量を検知する検知
手段と、該検知手段によつて検知された基準反射
部からの反射光量に基づいて複写条件を設定する
第１の制御手段と、前記検知手段によつて検知さ
れた原稿の先端部からの反射光量に基づいて複写
条件を設定する第２の制御手段と、前記検知手段
によつて検知された基準反射部と原稿の先端部と
からの反射光量の差が所定値以上かもしくは所定
値以下かを検出する検出手段と、該検出手段の検
出結果により前記反射光量の差が所定値以下のと
きには前記原稿の先端部を地肌と認識し前記第２
の制御手段によつて複写条件を設定させ、前記反
射光量の差が所定値以上のときには前記原稿の先
端部からの反射光量に基づかない前記第１の制御
手段によつて複写条件を設定させる選択手段とを
備えたことを特徴とする画像制御装置。1. In a copying apparatus that scans and copies an original by a scanning means, a reference reflecting section is scanned by the scanning means prior to scanning the original, and a detection unit detects the amount of reflected light from the reference reflecting section and the leading edge of the original. means, first control means for setting copying conditions based on the amount of light reflected from the reference reflecting portion detected by the detection means, and reflection from the leading edge of the document detected by the detection means. a second control means for setting copying conditions based on the light amount; and a second control means for determining whether the difference in the amount of reflected light from the reference reflecting portion and the leading edge of the document detected by the detection means is greater than or equal to a predetermined value or less than a predetermined value. and detecting means for detecting the second edge of the original when the difference in the amount of reflected light is less than a predetermined value according to the detection result of the detecting means.
A selection in which copying conditions are set by the control means, and when the difference in the amount of reflected light is equal to or greater than a predetermined value, the copying conditions are set by the first control means that is not based on the amount of light reflected from the leading edge of the document. An image control device comprising: means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001399A JPS58118662A (en) | 1982-01-08 | 1982-01-08 | Image controlling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001399A JPS58118662A (en) | 1982-01-08 | 1982-01-08 | Image controlling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58118662A JPS58118662A (en) | 1983-07-14 |
| JPH0418304B2 true JPH0418304B2 (en) | 1992-03-27 |
Family
ID=11500408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57001399A Granted JPS58118662A (en) | 1982-01-08 | 1982-01-08 | Image controlling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58118662A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58209755A (en) * | 1982-05-31 | 1983-12-06 | Canon Inc | Image formation |
| JPS6035752A (en) * | 1983-08-06 | 1985-02-23 | Canon Inc | Image control device |
| JPS60112073A (en) * | 1983-11-22 | 1985-06-18 | Matsushita Electric Ind Co Ltd | Electrophotographic copying machine |
| JPS60257457A (en) * | 1984-06-05 | 1985-12-19 | Fuji Xerox Co Ltd | Control method of automatic density adjustment |
| JPS61201263A (en) * | 1985-03-04 | 1986-09-05 | Fuji Xerox Co Ltd | Automatic image density controller for dry type electrophotographic copying machine |
| JPH0524923Y2 (en) * | 1985-07-22 | 1993-06-24 | ||
| US5363174A (en) * | 1993-12-20 | 1994-11-08 | Xerox Corporation | Method and apparatus for background control in an electrostatographic printing machine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS535635A (en) * | 1976-07-05 | 1978-01-19 | Canon Inc | Process and device for controlling image density |
| JPS543546A (en) * | 1977-06-10 | 1979-01-11 | Canon Inc | Exposure device |
| JPS5462833A (en) * | 1977-10-28 | 1979-05-21 | Canon Inc | Controlling method of original exposure |
| JPS54153038A (en) * | 1978-05-23 | 1979-12-01 | Minolta Camera Co Ltd | Automatic exposure control device of electrophoto graphic copier |
| JPS5667856A (en) * | 1979-11-07 | 1981-06-08 | Konishiroku Photo Ind Co Ltd | Ground color detector of original in copying machine |
| JPS56101157A (en) * | 1979-10-22 | 1981-08-13 | Nashua Corp | Automatic bias and match control unit for electrophotographic copier |
| JPS56110961A (en) * | 1980-02-07 | 1981-09-02 | Toshiba Corp | Exposure device of electrophotographic copier |
| JPS56156841A (en) * | 1980-05-09 | 1981-12-03 | Toshiba Corp | Electronic copying machine |
-
1982
- 1982-01-08 JP JP57001399A patent/JPS58118662A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS535635A (en) * | 1976-07-05 | 1978-01-19 | Canon Inc | Process and device for controlling image density |
| JPS543546A (en) * | 1977-06-10 | 1979-01-11 | Canon Inc | Exposure device |
| JPS5462833A (en) * | 1977-10-28 | 1979-05-21 | Canon Inc | Controlling method of original exposure |
| JPS54153038A (en) * | 1978-05-23 | 1979-12-01 | Minolta Camera Co Ltd | Automatic exposure control device of electrophoto graphic copier |
| JPS56101157A (en) * | 1979-10-22 | 1981-08-13 | Nashua Corp | Automatic bias and match control unit for electrophotographic copier |
| JPS5667856A (en) * | 1979-11-07 | 1981-06-08 | Konishiroku Photo Ind Co Ltd | Ground color detector of original in copying machine |
| JPS56110961A (en) * | 1980-02-07 | 1981-09-02 | Toshiba Corp | Exposure device of electrophotographic copier |
| JPS56156841A (en) * | 1980-05-09 | 1981-12-03 | Toshiba Corp | Electronic copying machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58118662A (en) | 1983-07-14 |
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