JP2006098915A - Exposure control system for plural image printing units of continuous paper electrophotographic device, and exposure timing generation circuit - Google Patents

Exposure control system for plural image printing units of continuous paper electrophotographic device, and exposure timing generation circuit Download PDF

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JP2006098915A
JP2006098915A JP2004286832A JP2004286832A JP2006098915A JP 2006098915 A JP2006098915 A JP 2006098915A JP 2004286832 A JP2004286832 A JP 2004286832A JP 2004286832 A JP2004286832 A JP 2004286832A JP 2006098915 A JP2006098915 A JP 2006098915A
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exposure
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printing unit
exposure timing
continuous paper
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Toru Kikuchi
徹 菊池
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Ricoh Printing Systems Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a print timing control system for superposing images one over another with high accuracy, in a continuous paper electrophotographic device constituted of a plurality of image printing units. <P>SOLUTION: Exposure timing signals, of which the number corresponds to the number of image printing units, are generated from a CPF signal that is a paper feed command signal of the continuous paper electrophotographic device, and exposure control is individually performed per image printing unit. The exposure timing signals are generated according to the differences in distance from exposure to transfer, which are different for each image printing unit. A circuit configuration is employed wherein a state of the CPF signal is stored in time series manner, by a memory write method, and the exposure timing signals are generated by a method of substituting time differences for addresses and reading them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は連続紙電子写真装置の複数印写ユニット露光制御方式に関するものである。   The present invention relates to a multiple printing unit exposure control system for a continuous paper electrophotographic apparatus.

連続紙電子写真装置は高速・大量印刷、稼動信頼性、低コストを特徴に市場でのシェアを獲得している。成長著しいオンデマンド市場では、多品種な印刷物を短時間で必要な部数を生産できる装置が望まれると同時に、印刷品質は高精度・高解像度そしてカラー化の要求が強い。カラー化を実現する一般的な構成は複数の印写ユニットそれぞれにY(イエロー)M(マゼンダ)C(シアン)K(黒)の各色を与え、各色画像を重ね合わせる方法を取る。特許文献1によれば、複数の印写ユニットと中間転写体を用いた構成の連続紙電子写真方式が示されている。また、特許文献2には複数の印写ユニットを千鳥に配置して用紙へ直接転写を行う連続紙電子写真方式の構成が示されている。   Continuous paper electrophotographic equipment has gained market share with high-speed, high-volume printing, operational reliability, and low cost. In the rapidly growing on-demand market, an apparatus capable of producing a required number of copies of a wide variety of printed materials in a short time is desired, and at the same time, there is a strong demand for high-precision, high-resolution and color printing. A general configuration for realizing colorization is a method in which Y (yellow), M (magenta), C (cyan), and K (black) are given to each of a plurality of printing units, and the respective color images are superimposed. According to Patent Document 1, a continuous paper electrophotographic system having a configuration using a plurality of printing units and an intermediate transfer member is shown. Japanese Patent Application Laid-Open No. 2004-228561 discloses a configuration of a continuous paper electrophotographic system in which a plurality of printing units are arranged in a staggered manner and directly transferred onto paper.

上述の様にカラー印刷が可能な連続紙電子写真装置が求められており、その実現手段である複数の印写ユニットの画像を高精度に重ね合わせる制御技術が求められている。   As described above, there is a need for a continuous paper electrophotographic apparatus capable of color printing, and there is a need for a control technique that superimposes images of a plurality of printing units, which are the means for realizing them, with high accuracy.

図5、図6を用いて従来の連続紙電子写真装置の印刷タイミングを説明する。一様に帯電された感光体ドラム51に対し、印刷データを変換したドットイメージに基づきレーザ光源(図示しない)をオン・オフして露光が行われ、露光点53の位置で感光体ドラム51面上に潜像を形成する。キャリアとトナーからなる現像剤を攪拌して摩擦帯電したトナーにより現像され、可視化されたトナー像は転写点54の位置で用紙52に転写される。露光を開始してから転写を開始するタイミングは、プロセス速度Vと露光−転写点間距離(La)55で決まる。ここで、プロセス速度Vは感光体ドラム51面の周速である。
次に、従来の連続紙電子写真装置における印刷タイミングのタイミングチャートを図5に示す。クロック41は装置の動作を制御する上で基準になるクロックで、その周期は装置が印刷中に搬送する紙の速度であるプロセス速度Vにより所定の距離を送った時に掛かる時間と等価であり、例えば1/6インチクロックと呼ぶ。紙送り指令であるCPF-N信号42はクロック41に同期を取り有効・無効に切り替わる。ここで、ローレベルが有効であり、ハイレベルは無効である。CPF-N信号42が有効になると伴に印刷データであるDATA−P信号43が発行され、印刷データに基づいて露光動作を開始する。図上の記号”▽”は露光点と呼び、印刷データの発行を開始するタイミングを意味する。図上の記号”▼”は転写点と呼び、現像されたトナー像を用紙上へ転写するタイミングを意味する。用紙上の正確な位置に印刷を行うこととは、印刷データを用紙上の所定の位置に転写することである。印刷データが転写点に達するタイミングは、CPF信号が有効になってからプロセス速度Vで上述の露光−転写点間距離(La)55を移動した時である。従って、紙送り速度44はCPF信号が有効になったことを基点にタイミングを図り、助走を開始して、転写点でプロセス速度Vに達すると共に所定量の紙送りを行うことで印刷位置を一致させる。
The printing timing of the conventional continuous paper electrophotographic apparatus will be described with reference to FIGS. The uniformly charged photosensitive drum 51 is exposed by turning on and off a laser light source (not shown) based on a dot image obtained by converting print data, and the surface of the photosensitive drum 51 is exposed at the position of the exposure point 53. A latent image is formed on the top. The developer composed of the carrier and the toner is stirred and developed by the frictionally charged toner, and the visualized toner image is transferred to the paper 52 at the transfer point 54. The timing for starting transfer after the start of exposure is determined by the process speed V and the distance between exposure and transfer points (La) 55. Here, the process speed V is the peripheral speed of the photosensitive drum 51 surface.
Next, FIG. 5 shows a timing chart of printing timing in the conventional continuous paper electrophotographic apparatus. The clock 41 is a reference clock for controlling the operation of the apparatus, and its period is equivalent to the time taken when the apparatus sends a predetermined distance by the process speed V, which is the speed of the paper conveyed during printing. For example, it is called a 1/6 inch clock. The CPF-N signal 42, which is a paper feed command, is switched between valid and invalid in synchronization with the clock 41. Here, the low level is valid and the high level is invalid. When the CPF-N signal 42 becomes valid, a DATA-P signal 43, which is print data, is issued, and an exposure operation is started based on the print data. The symbol “▽” in the figure is called an exposure point, and means the timing for starting the issuance of print data. The symbol “▼” in the figure is called a transfer point, and means the timing at which the developed toner image is transferred onto the paper. Printing at an accurate position on the paper means transferring the print data to a predetermined position on the paper. The timing at which the print data reaches the transfer point is when the exposure-transfer point distance (La) 55 is moved at the process speed V after the CPF signal becomes effective. Therefore, the paper feed speed 44 is timed based on the fact that the CPF signal has become effective, starts running, reaches the process speed V at the transfer point, and matches the print position by feeding a predetermined amount of paper. Let

特表2001−513910号公報JP-T-2001-513910

特開2003−91127号公報JP 2003-91127 A

本発明の目的は、複数の印写ユニットで構成する連続紙電子写真装置において、画像の重ね合わせを高精度に行う印刷タイミングの制御方式である。   An object of the present invention is a printing timing control system that performs high-precision image superposition in a continuous paper electrophotographic apparatus including a plurality of printing units.

本発明によれば、連続紙電子写真装置の紙送り指令信号であるCPF信号から印写ユニット台数分の露光タイミング信号を生成し、印写ユニット毎に個別の露光制御を行う。露光タイミング信号は印写ユニット毎に異なる露光から転写までの距離の差に応じて生成する。メモリをライトする方法でCPF信号の状態を時系列に記憶し、時間差をアドレスに置換え、リードする方法で露光タイミング信号を生成する回路構成を用いる。   According to the present invention, an exposure timing signal corresponding to the number of printing units is generated from a CPF signal which is a paper feed command signal of a continuous paper electrophotographic apparatus, and individual exposure control is performed for each printing unit. The exposure timing signal is generated according to the difference in distance from exposure to transfer that differs for each printing unit. A circuit configuration is used in which the state of the CPF signal is stored in time series by a method of writing memory, a time difference is replaced with an address, and an exposure timing signal is generated by a method of reading.

1つの紙送り指令信号から複数の露光タイミング信号を生成するので、紙送りと同期を取ると共に印写ユニット間の同期をとることができ、高精度な画像重ね合わせ制御を実現できる。また、印写ユニット毎に専用の露光タイミング信号を準備したことにより独立でリアルタイムな露光制御が可能になる。メモリを用いた回路構成を取ることでシンプルな露光タイミング信号生成回路を可能にする。   Since a plurality of exposure timing signals are generated from one paper feed command signal, it is possible to synchronize with the paper feed and to synchronize between the printing units, thereby realizing highly accurate image overlay control. In addition, by preparing a dedicated exposure timing signal for each printing unit, independent and real-time exposure control is possible. By adopting a circuit configuration using a memory, a simple exposure timing signal generation circuit can be realized.

装置はコントローラとエンジンで構成し、その間をインタフェース信号で連絡を取り、コントローラがエンジンを制御する。インタフェース信号であるCPF信号は印刷ページの長さと枚数を表す紙送り指令信号であり、この信号が有効になるとエンジンは紙送りを行い、無効になると紙送りを止める。また、CPF信号は印写プロセスにおいて印刷データの露光タイミングを決める役割も兼ねている。1つのCPF信号で複数の印写ユニットの露光タイミングを同時・並行に制御するのは極めて困難であり、それぞれの印写ユニットを独立でリアルタイムに制御するには、印写ユニット毎に露光タイミング信号を準備することが望ましい。   The apparatus is composed of a controller and an engine, and an interface signal is communicated between them, and the controller controls the engine. The CPF signal, which is an interface signal, is a paper feed command signal indicating the length and number of printed pages. The engine feeds paper when this signal is valid, and stops paper feed when it is invalid. The CPF signal also serves to determine the exposure timing of print data in the printing process. It is extremely difficult to control the exposure timing of a plurality of printing units simultaneously and in parallel with one CPF signal. To control each printing unit independently and in real time, an exposure timing signal for each printing unit is used. It is desirable to prepare.

従って、CPF信号から各印写ユニットの露光タイミング信号を生成する。各印写ユニットで異なる露光から転写までの距離の差を時間差に置き換え、印写ユニット間の時間差に応じてCPF信号を遅延させる方法で各印写ユニットの露光タイミング信号を生成する。   Therefore, an exposure timing signal for each printing unit is generated from the CPF signal. An exposure timing signal of each printing unit is generated by replacing a difference in distance from different exposure to transfer in each printing unit with a time difference, and delaying the CPF signal in accordance with the time difference between the printing units.

タイマを用いた回路の場合、カウント数の更新やカウントを開始するタイミングを図る手間が生じて処理が複雑である。また印写ユニットの台数分が必要になるため回路物量が増大する。そこでメモリを用いた回路方式を考えた。メモリを用いた回路の場合、ライトする方法でCPF信号の状態を時系列に記憶して、時間差をアドレスに置換え、リードする方法でCPF信号の状態を再現し、露光タイミング信号を生成する。単にライトとリード操作によって実現できるので回路構成が単純であり、メモリ一つで複数の露光タイミング信号を生成でき回路物量を小さくできる。
露光タイミング信号はそれぞれの印写ユニット毎に準備して独立でリアルタイムな露光制御が可能になることで、高精度な画像重ね合わせを実現する。
In the case of a circuit using a timer, it takes time to update the count number and set the timing for starting the count, and the processing is complicated. Further, since the number of printing units is required, the circuit quantity increases. Therefore, a circuit system using a memory was considered. In the case of a circuit using a memory, the state of the CPF signal is stored in time series by a writing method, the time difference is replaced with an address, the state of the CPF signal is reproduced by a reading method, and an exposure timing signal is generated. Since the circuit configuration is simple because it can be realized simply by writing and reading operations, a plurality of exposure timing signals can be generated with a single memory, and the amount of circuit components can be reduced.
An exposure timing signal is prepared for each printing unit, and independent and real-time exposure control is possible, thereby realizing high-precision image overlay.

図3、図4に複数の印写ユニットの画像を重ね合わせる方法で印刷を実現する構成を示す。4台の印写ユニットA31、B32、C33、D34はそれぞれK(黒)C(シアン)M(マゼンダ)Y(イエロー)の色トナーで現像されたトナー像を生産する。各色印写ユニットのトナー像は中間転写体35上に精度良く重ね合わせられ、転写点”▼”で用紙上に一括転写を行い印刷画像を得る。図3は印写ユニットA31の場合の露光−転写点間距離(La)36を示し、図4は印写ユニットD34の場合の露光−転写点間距離(Ld)37を示す。各印写ユニットの露光−転写点間距離はその配置に基づき異なる。露光タイミングは露光−転写点間距離に依存し、4台の印写ユニットA31、B32、C33、D34の露光−転写点間距離をLa36、Lb、Lc、Ld37とした場合の印刷タイミングを図2に示す。従来の連続紙電子写真装置と同様に紙送り指令CPF−N信号22はクロック21に同期を取り発行される。最も遠い露光−転写点間距離Laの印写ユニットAの露光タイミング信号にCPF−N信号22をそのまま用い、印写ユニットAの印刷データDATA_A−N信号23はCPF−N信号22と同期を取り出力される。印写ユニットAと印写ユニットB、C、Dの露光−転写点間距離の差である(La−Lb)、(La−Lc)、(La−Ld)の分を、印写ユニットAの露光タイミング信号であるCPF−N信号22を遅らせる方法で生成する。印写ユニットBの露光タイミング信号CPF_B−N信号25、印写ユニットCの露光タイミング信号CPF_C−N信号27、印写ユニットDの露光タイミング信号CPF_D−N信号29により各印写ユニットは露光タイミングを取る。そして印写ユニットB、C、Dの印刷データはそれぞれDATA_B−P信号26、DATA_C−P信号28、DATA_D−P信号210であり、露光タイミング信号に同期をとって出力される。   3 and 4 show a configuration for realizing printing by a method of superimposing images of a plurality of printing units. The four printing units A31, B32, C33, and D34 produce toner images developed with color toners of K (black), C (cyan), M (magenta), and Y (yellow), respectively. The toner images of the respective color printing units are accurately superimposed on the intermediate transfer body 35, and are collectively transferred onto a sheet at a transfer point “▼” to obtain a printed image. FIG. 3 shows the distance between exposure and transfer points (La) 36 in the case of the printing unit A31, and FIG. 4 shows the distance between exposure and transfer points (Ld) 37 in the case of the printing unit D34. The distance between the exposure and transfer points of each printing unit varies depending on its arrangement. The exposure timing depends on the distance between the exposure and transfer points, and the print timing when the distance between the exposure and transfer points of the four printing units A31, B32, C33 and D34 is La36, Lb, Lc and Ld37 is shown in FIG. Shown in The paper feed command CPF-N signal 22 is issued in synchronization with the clock 21 as in the conventional continuous paper electrophotographic apparatus. The CPF-N signal 22 is used as it is for the exposure timing signal of the printing unit A at the farthest exposure-transfer point distance La, and the printing data DATA_A-N signal 23 of the printing unit A is synchronized with the CPF-N signal 22. Is output. The difference between (La−Lb), (La−Lc), and (La−Ld), which is the difference between the exposure-transfer point distances of the printing unit A and the printing units B, C, and D, is determined by the printing unit A. The CPF-N signal 22 which is an exposure timing signal is generated by a method of delaying. The printing unit B controls the exposure timing by the exposure timing signal CPF_B-N signal 25 of the printing unit B, the exposure timing signal CPF_C-N signal 27 of the printing unit C, and the exposure timing signal CPF_D-N signal 29 of the printing unit D. take. The print data of the printing units B, C, and D are a DATA_BP signal 26, a DATA_CP signal 28, and a DATA_DP signal 210, respectively, and are output in synchronization with the exposure timing signal.

次に露光タイミング信号を生成する回路のブロック図を図1に示す。
露光タイミング信号は、それぞれの印写ユニット毎に異なる露光−転写点間距離の差に応じた時間差でCPF信号を遅らせる方法で生成する。
Next, FIG. 1 shows a block diagram of a circuit for generating an exposure timing signal.
The exposure timing signal is generated by a method in which the CPF signal is delayed by a time difference corresponding to a difference in distance between exposure and transfer points that is different for each printing unit.

アドレスカウンタ11は常時クロック12をカウントすることで出力カウント値を更新する。CPF信号13の状態はクロック12に同期してメモリ14へライトされ、この時アドレスセレクタ15はアドレスカウンタ11の値をセレクトしてアドレスを指定する。本構成によりCPF信号13の状態が時系列にアドレスの順でメモリ14に記憶される。
露光タイミング信号16はデータラッチ17の出力であり、この場合A、B、C、Dの4種類がある。セレクト信号110は上記A、B、C、D4種類のいづれかを選択する信号で、選択対象としてアドレスオフセットデータ18とデータラッチ17がある。アドレスオフセットデータ18はメモリ14からデータをリードする際に露光タイミングA、B、C、Dでアドレスオフセット値を変える。それぞれの値は露光−転写点間距離に応じて決まる固定値である。露光タイミングAはCPF信号そのものであり、この場合アドレスオフセットデータ18のNaは”0”である。次に露光タイミング信号Bの場合を以下に示す。印写ユニットAとBの露光点−転写点間距離の差は(La−Lb)、プロセス速度V、クロックF=1/Tc=1/(M/V)、ここでMは例えば1/6インチである。
印写ユニットBの露光タイミングの遅れ時間Tdb=(La−Lb)/V、より遅れ時間TdbをクロックTcのカウントNbで表すと、
Nb=Tdb/Tc={(La−Lb)/V}/(M/V)=(La−Lb)/M
従って、露光点−転写点間距離の差(La−Lb)をMの整数倍にすることで遅れ時間をクロックTcのカウント数Nbで表現できる。現在時刻を示す更新カウンタの値Aとした時、印写ユニットBの露光タイミング信号はCPF信号からTdb遅れて(A−Nb)であることから、アドレス(A−Nb)のデータが印写ユニットBの露光タイミング信号に相当する。
印写ユニットC、Dも同様に考えアドレス(A−Nc)、(A−Nd)のデータがそれぞれ露光タイミング信号となる。
図1のブロック図では、上述Na、Nb、Nc、Ndがアドレスオフセットデータ18に相当し、アドレスカウンタ11とアドレスオフセットデータ18の和を取るアダー19側をアドレスセレクタ15はセレクトしてアドレスを指定し、順次セレクト信号110で切替えてメモリ14から読み出してデータラッチ17を更新することで印写ユニットA、B、C、Dの露光タイミング信号16を生成する。
The address counter 11 constantly updates the output count value by counting the clock 12. The state of the CPF signal 13 is written to the memory 14 in synchronization with the clock 12, and at this time, the address selector 15 selects the value of the address counter 11 and designates the address. With this configuration, the state of the CPF signal 13 is stored in the memory 14 in chronological order of addresses.
The exposure timing signal 16 is an output of the data latch 17, and in this case, there are four types of A, B, C, and D. The select signal 110 is a signal for selecting one of the above-mentioned A, B, C, and D types, and includes an address offset data 18 and a data latch 17 as selection targets. The address offset data 18 changes its address offset value at exposure timings A, B, C, and D when data is read from the memory 14. Each value is a fixed value determined according to the distance between the exposure and transfer points. The exposure timing A is the CPF signal itself. In this case, Na of the address offset data 18 is “0”. Next, the case of the exposure timing signal B is shown below. The difference between the exposure point-transfer point distances of the printing units A and B is (La-Lb), the process speed V, the clock F = 1 / Tc = 1 / (M / V), where M is, for example, 1/6 Inches.
When the delay time Tdb of the exposure timing of the printing unit B is expressed as Tdb = (La−Lb) / V, and the delay time Tdb is expressed as a count Nb of the clock Tc,
Nb = Tdb / Tc = {(La−Lb) / V} / (M / V) = (La−Lb) / M
Therefore, the delay time can be expressed by the count number Nb of the clock Tc by setting the difference between the exposure point-transfer point distance (La-Lb) to an integral multiple of M. When the value A of the update counter indicating the current time is set, the exposure timing signal of the printing unit B is (A-Nb) delayed by Tdb from the CPF signal, so that the data at the address (A-Nb) is transferred to the printing unit. This corresponds to the B exposure timing signal.
Similarly, the printing units C and D also consider the data at the addresses (A-Nc) and (A-Nd) as exposure timing signals.
In the block diagram of FIG. 1, Na, Nb, Nc, and Nd correspond to the address offset data 18, and the address selector 15 selects the adder 19 side that takes the sum of the address counter 11 and the address offset data 18 to specify the address. Then, the exposure timing signal 16 of the printing units A, B, C, and D is generated by sequentially switching with the select signal 110 and reading from the memory 14 and updating the data latch 17.

複数の印写ユニットで構成する連続紙電子写真装置の露光タイミング制御に広く適用できる。 The present invention can be widely applied to exposure timing control of a continuous paper electrophotographic apparatus composed of a plurality of printing units.

露光タイミング生成回路ブロック図示す図である。It is a figure which shows an exposure timing generation circuit block diagram. 複数印写ユニット露光制御タイミングチャートを示す図である。It is a figure which shows a multiple printing unit exposure control timing chart. 複数印写ユニットの露光−転写点距離を説明する図を示す図である。It is a figure which shows the figure explaining the exposure-transfer point distance of a multiple printing unit. 複数印写ユニットの露光−転写点距離を説明する図を示す図である。It is a figure which shows the figure explaining the exposure-transfer point distance of a multiple printing unit. 電子写真装置の露光制御タイミングチャートを示す図である。It is a figure which shows the exposure control timing chart of an electrophotographic apparatus. 電子写真装置の印写部概略図を示す図である。It is a figure which shows the printing part schematic of an electrophotographic apparatus.

符号の説明Explanation of symbols

1はヒートパイプ、1aは放熱フィン、1bはエアガイド、2はファン、3はベアリング、4は記録紙、5は用紙冷却装置、6は電子写真式印刷装置、7は電子写真式印刷装置又は、後処理機8は定着装置である。
1 is a heat pipe, 1a is a heat radiation fin, 1b is an air guide, 2 is a fan, 3 is a bearing, 4 is a recording paper, 5 is a paper cooling device, 6 is an electrophotographic printing device, and 7 is an electrophotographic printing device or The post-processor 8 is a fixing device.

Claims (3)

複数の印写ユニットから構成する連続紙電子写真装置において、1つの紙送り指令信号から前記印写ユニットと同数の露光タイミング信号を生成して、前記露光タイミング信号で印写ユニットの露光制御を個別に行うことを特徴とする連続紙電子写真装置の複数印写ユニット露光制御方式。 In a continuous paper electrophotographic apparatus composed of a plurality of printing units, the same number of exposure timing signals as the printing unit are generated from one paper feed command signal, and the exposure control of the printing unit is individually controlled by the exposure timing signal. A multiple printing unit exposure control system for a continuous paper electrophotographic apparatus. 前記露光タイミング信号は、各印写ユニットの露光から転写までの距離に応じて生成されることを特徴とする請求項1記載の連続紙電子写真装置の複数印写ユニット露光制御方式。   2. The multiple printing unit exposure control system for a continuous paper electrophotographic apparatus according to claim 1, wherein the exposure timing signal is generated according to a distance from exposure to transfer of each printing unit. 前記露光タイミング信号は、クロックで常時カウントを行う更新カウンタと、固定加算値と、メモリとを用いて、紙送り指令信号の論理状態をデータとして更新カウンタのメモリのアドレスにライトする書込み部と、前記更新カウンタと、前記固定加算値の和で求めたメモリのアドレスをリードする読取り部から構成し、前記固定加算値を既知の露光から転写までの距離に基づき決定し、前記固定加算値と、前記更新カウンタの和で求めたアドレスをリードして得るデータで生成することを特徴とする請求項1および請求項2記載の露光制御方式を用いた電子写真式印刷装置の露光タイミング信号生成回路。
The exposure timing signal uses an update counter that always counts with a clock, a fixed addition value, and a memory, and a writing unit that writes the logical state of the paper feed command signal to the address of the update counter as data, The update counter and a reading unit that reads the address of the memory obtained by the sum of the fixed addition value, the fixed addition value is determined based on a distance from known exposure to transfer, the fixed addition value, 3. An exposure timing signal generation circuit of an electrophotographic printing apparatus using an exposure control system according to claim 1, wherein the exposure timing signal is generated from data obtained by reading an address obtained by the sum of the update counters.
JP2004286832A 2004-09-30 2004-09-30 Exposure control system for plural image printing units of continuous paper electrophotographic device, and exposure timing generation circuit Pending JP2006098915A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01142680A (en) * 1987-11-30 1989-06-05 Canon Inc Image forming device
JP2004069933A (en) * 2002-08-05 2004-03-04 Hitachi Ltd Speed detector and image forming apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01142680A (en) * 1987-11-30 1989-06-05 Canon Inc Image forming device
JP2004069933A (en) * 2002-08-05 2004-03-04 Hitachi Ltd Speed detector and image forming apparatus

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