JPH0312644A - Automatic exposure controller - Google Patents
Automatic exposure controllerInfo
- Publication number
- JPH0312644A JPH0312644A JP14793389A JP14793389A JPH0312644A JP H0312644 A JPH0312644 A JP H0312644A JP 14793389 A JP14793389 A JP 14793389A JP 14793389 A JP14793389 A JP 14793389A JP H0312644 A JPH0312644 A JP H0312644A
- Authority
- JP
- Japan
- Prior art keywords
- original
- reflected light
- copy lamp
- light quantity
- detected
- 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
Links
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
Description
【発明の詳細な説明】
（ａｌ産業上の利用分野
この発明は複写機のコピーランプの露光量を調整する装
置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a device for adjusting the exposure amount of a copy lamp of a copying machine.
の構成を表した図である。FIG.
図において、複写機本体上面の原稿台上に載置された原
稿１はコピーランプ２が矢印Ａ方向へ移動することによ
って走査される。コピーランプ２による原稿の反射光は
図中破線で示すように、ミラー４によって感光体ドラム
３上に導かれて潜像形成を行うとともに、ＡＥセンサ５
に入射する。In the figure, a copy lamp 2 moves in the direction of arrow A to scan a document 1 placed on a document table on the top of the copying machine main body. The light reflected from the original by the copy lamp 2 is guided onto the photoreceptor drum 3 by the mirror 4 to form a latent image, as shown by the broken line in the figure, and is also directed to the AE sensor 5.
incident on .
ＡＥセンサ５への入射光量ＶＡＥはＭ Ｐ Ｕ （Ｍｉ
ｃｒ。The amount of light VAE incident on the AE sensor 5 is M P U (Mi
cr.
Ｐｒｏｃｅｓｓｉｎｇ ｌ１ｎｉｔ）が読み込み、原稿
濃度ＶＡＥた応じたコピーランプの適正光量を算出して
ＣＬＲ（Ｃｏｐｙ Ｌａｍｐ Ｒｅｇｕ（’ａｔｏｒ）
を介してコピーランプ光量を自動調整する。これにより
複写画像の細線再現性が確保されたり、バンクグラウン
ドのカブリが防止される。Processing l1nit) reads the data, calculates the appropriate light amount of the copy lamp according to the original density VAE, and outputs the CLR
Automatically adjust the copy lamp light intensity via . This ensures fine line reproducibility of the copied image and prevents fogging of the bank ground.
（Ｃ）発明が解決しようとする課題
ところでＡＥセンサ出力電圧には、コピーランプ出力電
圧一定時においても電源周波数のリップル（うねり）が
生じている。そのため従来の装置においては、コピーラ
ンプ駆動電源のゼロクロスポイントをＶＡＥ読み込みの
サンプリングタイミングとして出力電圧へのリンプルの
影響を防止していた。ところがこの場合原稿濃度のサン
プリングが半周期ごとにしか行うことが出来ず、原稿の
濃度変化に対してコピーランプ制御の遅れが生じていた
。特に最近の高速複写機においてはこの現象が著しかっ
た。(C) Problems to be Solved by the Invention Incidentally, ripples (undulations) in the power supply frequency occur in the AE sensor output voltage even when the copy lamp output voltage is constant. Therefore, in conventional devices, the zero-crossing point of the copy lamp drive power source is used as the sampling timing for VAE reading to prevent the influence of ripple on the output voltage. However, in this case, sampling of the original density could only be performed every half cycle, resulting in a delay in copy lamp control with respect to changes in the density of the original. This phenomenon is particularly noticeable in recent high-speed copying machines.
この発明の目的は、濃度検出のサンプリング点数を増や
すことによって濃度調整の遅れを防止して形成画像品質
を向上させることのできる自動露光制御装置を提供する
ことを目的とする。An object of the present invention is to provide an automatic exposure control device that can prevent delays in density adjustment and improve the quality of formed images by increasing the number of sampling points for density detection.
（ｄ１課題を解決するための手段
この発明は、検出される原稿反射光に応じてコピーラン
プ光量を制御する自動露光制御装置において、
コピーランプ駆動電源のゼロクロスポイントを基準にし
た少なくとも半周期内での複数のサンプリング点におけ
る、基準濃度原稿に対する原稿反射光量に基づいて、前
記各サンプリング点で前記原稿反射光量の補正を行う手
段を設けたことを特徴とする。(Means for Solving Problem d1) The present invention provides an automatic exposure control device that controls the amount of light of a copy lamp in accordance with detected reflected light from an original, within at least a half cycle based on the zero cross point of the copy lamp drive power source. The present invention is characterized in that means is provided for correcting the amount of light reflected from the original at each sampling point based on the amount of light reflected from the original with respect to the reference density original at a plurality of sampling points.
（ｅ）作用
この発明においては、ゼロクロスポイントとゼロクロス
ポイントとの間にも原稿反射光量のサンプリング点を設
けているので、細かい間隔でコピーランプ光量を制御す
ることができる。このとき、各サンプリング点における
基準原稿に対する原稿反射光量に基づいて、検出された
原稿反射光量の補正が行われるので電源周波数のリップ
ルの影響を受けることなくコピーランプ光量制御を行う
ことができる。(e) Function In the present invention, sampling points for the amount of light reflected from the original are provided between the zero-crossing points, so the light amount of the copy lamp can be controlled at fine intervals. At this time, the detected amount of reflected light from the original is corrected based on the amount of reflected light from the original with respect to the reference original at each sampling point, so the copy lamp light amount can be controlled without being affected by ripples in the power supply frequency.
コピーランプ２による原稿の反射光がＡＥセンサ５で検
出される。ＭＰＵはこの検出値をＡ／Ｄ変換して取り込
み、ＶＣＬ （コピーランプ制御電圧）を算出し、さら
にこのデータをＰＷＭ（ＰｕｌｓｅＷｉｄｔｈ Ｍｏｄ
ｕｌａｔｉｏｎ）値としてＣＬＲに出力する。The light reflected from the original by the copy lamp 2 is detected by the AE sensor 5. The MPU A/D converts this detected value and imports it, calculates VCL (copy lamp control voltage), and further converts this data into PWM (Pulse Width Mod).
ulation) value to the CLR.
ＣＬＲではこの値に基づいてコピーランプ２を位相制御
して点灯させる。The CLR controls the phase of the copy lamp 2 based on this value and lights it up.
第１図はＡＥセンサ出力のサンプリング例を示した図で
ある。FIG. 1 is a diagram showing an example of sampling of the AE sensor output.
半周期のゼロクロスポイントＰ。、２４間に１０点のサ
ンプリング点８０〜Ｓ、が設定されている。これらの各
点Ｓ。−８，における基準濃度原稿に対する基準反射光
ｆｆｉ Ｄｏ〜Ｄ、は予め測定されてＭＰ［Ｊに記憶さ
れている。この基準反射光量Ｄｏ”＋Ｄｑからサンプリ
ング点Ｓ、、におけるＡＥセンサ出力値ＶＡＥ、を補正
して、リップルの影響を除外したＶＡＥを求めることが
できる。Half-cycle zero-crossing point P. , 24, 10 sampling points 80-S are set. Each of these points S. -8, the reference reflected light ffi Do to D for the reference density original is measured in advance and stored in MP[J. By correcting the AE sensor output value VAE at the sampling point S, , from this reference amount of reflected light Do''+Dq, it is possible to obtain the VAE excluding the influence of ripple.
ＶＡＥ＝ＶＡＥ、Ｘ （Ｄｏ ／Ｄ、ｌ）なおこの実施
例ではゼロクロスポイントＰ。、Ｐ、間において１０点
のサンプリング点を設けたがこの数は任意である。また
、リップル補正のための駆動電源周期は半周期以上に設
定してもよい。VAE=VAE,X (Do/D, l) Note that in this embodiment, zero cross point P. , P, 10 sampling points are provided between them, but this number is arbitrary. Further, the drive power cycle for ripple correction may be set to a half cycle or more.
さらに、前記補正式にはコピーランプ、感光体。Furthermore, the correction formula includes a copy lamp and a photoreceptor.
制御系等の変動特性を加味してもよい。Fluctuation characteristics of the control system, etc. may also be taken into consideration.
（ｇ１発明の効果
以上のようにこの発明によれば、電源周波数のリップル
の影響を受けることなく原稿濃度検出の間隔を短くして
コピーランプ制御を行うことができるので、原稿の濃度
変化に素早く対応でき形成画像品質を向上させることが
できる。(g1 Effect of the Invention As described above, according to the present invention, copy lamp control can be performed by shortening the interval of document density detection without being affected by ripples in the power supply frequency, so changes in the density of the document can be quickly detected. It is possible to improve the quality of formed images.
Claims (1)
を制御する自動露光制御装置において、コピーランプ駆
動電源のゼロクロスポイントを基準にした少なくとも半
周期内での複数のサンプリング点における、基準濃度原
稿に対する原稿反射光量に基づいて、前記各サンプリン
グ点で前記原稿反射光量の補正を行う手段を設けたこと
を特徴とする自動露光制御装置。(1) In an automatic exposure control device that controls the light amount of a copy lamp according to the detected reflected light of the original, the reference density original is detected at a plurality of sampling points within at least a half cycle based on the zero cross point of the copy lamp drive power source. An automatic exposure control device comprising means for correcting the amount of reflected light on the original at each sampling point based on the amount of reflected light on the original.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1147933A JPH0820685B2 (en) | 1989-06-09 | 1989-06-09 | Automatic exposure control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1147933A JPH0820685B2 (en) | 1989-06-09 | 1989-06-09 | Automatic exposure control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0312644A true JPH0312644A (en) | 1991-01-21 |
| JPH0820685B2 JPH0820685B2 (en) | 1996-03-04 |
Family
ID=15441351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1147933A Expired - Fee Related JPH0820685B2 (en) | 1989-06-09 | 1989-06-09 | Automatic exposure control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0820685B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138663A (en) * | 1981-02-20 | 1982-08-27 | Ricoh Co Ltd | Copying device |
| JPS6010316A (en) * | 1983-06-30 | 1985-01-19 | Ricoh Co Ltd | Optical output adjusting device |
| JPS6152658A (en) * | 1984-08-22 | 1986-03-15 | Canon Inc | Image forming device |
-
1989
- 1989-06-09 JP JP1147933A patent/JPH0820685B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138663A (en) * | 1981-02-20 | 1982-08-27 | Ricoh Co Ltd | Copying device |
| JPS6010316A (en) * | 1983-06-30 | 1985-01-19 | Ricoh Co Ltd | Optical output adjusting device |
| JPS6152658A (en) * | 1984-08-22 | 1986-03-15 | Canon Inc | Image forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0820685B2 (en) | 1996-03-04 |
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