JPS62209435A - Electrophotographic copying device adjusting photosensitive body potential - Google Patents

Abstract

PURPOSE:To eliminate the need for troublesome trial copying operation during the exposure adjustments of a photosensitive body and to easily execute adjustments for manufacture and maintenance by providing a switching means which switches and adjusts the brightness of an exposure lamp in plural stages according to the sensitivity of the photosensitive body. CONSTITUTION:An exposure lamp control part 4 starts turn-on control over the exposure lamp 1 with an exposure command from a switch 12 associated with copying operation to perform feedback control over the brightness of the exposure lamp 1 corresponding to a set voltage Vs and also make corrections based upon the temperature of the photosensitive drum and the quantity of copies. Then, a brightness value set by a brightness setter 9 is corrected by a changeover switch circuit 11 with a bias. When a changeover switch SW is switched, the adjustment to a switching position corresponding to the sensitivity of the photosensitive drum is executed and switching operation is performed according to the classes of sensitivity of the photosensitive drum mounted on the main device body.

Description

【発明の詳細な説明】 一産業上の利用分野一 本発明は電子写真複写装置に係り、特に感光体の電位を
露光ｊ七から調整する複写装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrophotographic copying apparatus, and more particularly to a copying apparatus that adjusts the potential of a photoreceptor from exposure j7.

一発明の背景− 電子写真複写装置においては露光ランプで照射された原
稿画像を光学系を介して帯電感光体ドラム上に潜像とし
て記録し、現像装置によって該潜像をトナー現像し、さ
らに記録紙表面にトナー像を転写、定着させる。Background of the Invention - In an electrophotographic copying apparatus, an original image irradiated by an exposure lamp is recorded as a latent image on a charged photoreceptor drum via an optical system, the latent image is developed with toner by a developing device, and further recorded. Transfers and fixes the toner image onto the paper surface.

ここで、′Ａ光ランプの露光量は、感光体ドラムの電位
として現われ、この電位の高低は画像濃度の過不足や、
地かぶりとなる。このため、従来から露光ランプの露光
量制御が行われているが、同じ露光量にも感光体ドラム
の感度の違いで露光量が不適当となる。Here, the amount of exposure from the 'A light lamp appears as the potential of the photoreceptor drum, and the level of this potential is determined by the excess or deficiency of image density,
It will cover the ground. For this reason, the exposure amount of an exposure lamp has been controlled conventionally, but even if the exposure amount is the same, the exposure amount becomes inappropriate due to the difference in sensitivity of the photoreceptor drum.

そこで、装置の製造最終試験や保守点検時にテストパタ
ーンが印刷された原稿による試し複写を行い、画像のぼ
け修正等と共に露光Ｉ１１．の過不足チェックで露光ラ
ンプの露光量調整を行うようにしている。Therefore, during final manufacturing tests and maintenance inspections of the device, trial copies are made using originals on which test patterns are printed, and the exposure I11. The exposure amount of the exposure lamp is adjusted by checking for excess or deficiency.

また、他の方法として、感光体ドラムカートリッジに感
光体感度特性をフィードバックするＬ段を備えるものが
ある。Further, as another method, there is a method that includes an L stage that feeds back the sensitivity characteristics of the photoreceptor to the photoreceptor drum cartridge.

一発明が解決しようとする開題点− 従来の試し複写方法においては、試し複写操作と複写濃
度の判定作業と、露光ランプの露光量調整という作業を
多数回繰り返し行う必要があるため、調整にＦ間取る聞
届があった。さらに、周囲温度、複写枚数等で感光体ド
ラムが電位変化すること、及び湿度によって現像剤特性
が変化すること、その他に現像剤の経時的な特性変化な
ど、種々の要因による適正露光量の変動があることから
、最適設定を難しくするし、定期的な煩わしい調整作又
を必要とする。Problem to be Solved by the Invention - In the conventional trial copying method, it is necessary to repeat the trial copying operation, the work of determining the copy density, and the work of adjusting the exposure amount of the exposure lamp many times. There was an intervening hearing. Furthermore, the appropriate exposure amount may vary due to various factors such as changes in the potential of the photoreceptor drum due to ambient temperature, number of copies, etc., changes in developer characteristics due to humidity, and changes in developer characteristics over time. This makes optimal settings difficult and requires periodic and troublesome adjustment operations.

従来の感光体ドラムの感度特性をフィードバックする方
法は、装置を複雑高価にする問題があった。The conventional method of feeding back the sensitivity characteristics of a photoreceptor drum has the problem of making the device complicated and expensive.

一問題点を解決するための１段− 前述した問題を解決するため、本発明は露光ランプの輝
度を制御する露光ランプ制御手段と、この露光ランプ制
御・１段の輝度制御量を感光体の感度に応じてｍ６段に
切換調整する切換り段とを備えた電子写真複写袋ｄを提
供するものである。First stage for solving one problem - In order to solve the above-mentioned problem, the present invention includes an exposure lamp control means for controlling the brightness of an exposure lamp, and a first stage brightness control amount of the photoreceptor. The present invention provides an electrophotographic copying bag d which is equipped with a switching stage which can be switched and adjusted to m6 stages according to the sensitivity.

一実施例− 図は本発明の一実施例を示す露光ランプ制御回路図であ
るａ′Ａ光ランうｌにはトライアック２が直列接続され
て交流電源３から給電され、トライアック２の導通率制
御によって輝度制御がなされる。露光ラン′プ制御部４
は％ｌｉ度設定（ｆｉを電圧ｖＳとしてケえられ、露光
ランプｌの印加電圧を検出する電圧検出器５の検出電圧
Ｖ（との比較によって導通率制御信−）を得、この信号
はゲート回路６によって交流電源３に同期したゲート信
号として取出される。One Embodiment - The figure is an exposure lamp control circuit diagram showing one embodiment of the present invention. A triac 2 is connected in series to the a'A light run 1 and is supplied with power from an AC power supply 3, and the conductivity of the triac 2 is controlled. Brightness control is performed by. Exposure lamp' lamp control section 4
is the %li degree setting (fi is the voltage vS), the detection voltage V of the voltage detector 5 that detects the voltage applied to the exposure lamp l is obtained (conductivity control signal -) is obtained by comparison with the voltage applied to the exposure lamp l, and this signal is The gate signal is extracted by the circuit 6 as a gate signal synchronized with the AC power supply 3.

露光ランプ制御部４は、輝度制御信号の補正演算のため
に、感光体ドラムの温度検出を行う温度検出器７及び複
写枚数積算器８の検出信号を取込み、これら検出信号に
よる補正によって感光体ドラムの白紙電位等を補正する
。The exposure lamp control section 4 takes in detection signals from a temperature detector 7 that detects the temperature of the photoreceptor drum and a copy number integrator 8 for correction calculation of the brightness control signal, and corrects the photoreceptor drum by correction using these detection signals. Correct the blank paper potential, etc.

ここで、輝度設定値■ｓは、輝度設定器９から加算器ｌ
Ｏを介して与えられ、この加算器１０は切換スイッチ回
路ｌｌからのバイアス出力が加算入力としてＴえられる
。切換スイッチ回路１１は抵抗Ｒ１−Ｒｎを切換スイッ
チＳＷによってｎ段に！／Ｊ換え、この切換えた抵抗と
微調整用可変抵抗■Ｒの直列回路で加算器ｌＯの加算入
力が設定される。抵抗Ｒ＋　”　Ｒｎは感光体ドラムの
感度に応じて適切なバイアス出力値になるよう抵抗値が
設定されている。Here, the brightness set value ■s is calculated from the brightness setter 9 to the adder l.
This adder 10 receives the bias output from the changeover switch circuit 11 as an addition input. The changeover switch circuit 11 has resistors R1-Rn arranged in n stages by the changeover switch SW! /J, the addition input of the adder IO is set by the series circuit of this switched resistor and the fine adjustment variable resistor -R. The resistance value of the resistor R+''Rn is set so as to provide an appropriate bias output value depending on the sensitivity of the photoreceptor drum.

こうした構成において、複写動作に連動するスイッチ１
２からの露光指令で露光ランプ制御部４が露光ランプｌ
の点灯制御を開始し、露光ランプｌの輝度を設定電圧ｖ
５に対応するようフィードパック制御し、また感光体ド
ラムの温度や複写枚数による補正を行う。In such a configuration, the switch 1 linked to the copying operation
The exposure lamp control unit 4 controls the exposure lamp l in response to an exposure command from 2.
starts the lighting control of the exposure lamp l and sets the brightness of the exposure lamp l with the voltage v
Feed pack control is performed to correspond to 5, and corrections are made based on the temperature of the photosensitive drum and the number of copies.

そして、設定電圧ｖＳとしては輝度設定器９による設定
値を切換スイッチ回路１１によりバイアス補正を行う、
ここで、切換スイッチＳＷによるしＪ換えには感光体ド
ラムの感度に応じた切換位置−の調整がなされ、装置本
体に装着し、た感光体ドラムの感度別の級に応じて切換
操作される。Then, as the set voltage vS, the set value by the brightness setting device 9 is subjected to bias correction by the changeover switch circuit 11.
Here, the switching position is adjusted according to the sensitivity of the photoreceptor drum by the changeover switch SW, and the switching operation is performed according to the sensitivity class of the photoreceptor drum attached to the main body of the device. .

従って、感光体ドラムを級分けした感度に応じて！／Ｊ
換スイー、チＳＷを切換操作することで当該感光体ドラ
ムに適応した輝度設定を行うことができ、すＪ換段数を
多くすることで精度良く最適輝度設定を行うことができ
る。こうした輝度設定は感光体ドラムの交換にはその交
換時に切換スイッチＳＷを感光体ドラムの感度縁に対応
づけた位置に切換えることで済む。Therefore, depending on the sensitivity of the photoreceptor drum! /J
By switching the switching SW and CH SW, brightness settings suitable for the photosensitive drum can be performed, and by increasing the number of switching stages, the optimal brightness setting can be performed with high accuracy. Such brightness setting can be achieved by changing the changeover switch SW to a position corresponding to the sensitivity edge of the photoreceptor drum when replacing the photoreceptor drum.

なお、実施例では切換スイッチ回路によって輝度制ｍ　
ｉ、ｉ−を調整する場合を示すが、これは他のｍ１段に
、例えば感度縁に応じてキースイッチで指定するなど他
の切換手段に適宜設計変更される。In addition, in the embodiment, the brightness control m is controlled by the changeover switch circuit.
The case where i and i- are adjusted is shown, but the design can be appropriately changed to other m1 stages, for example, by using other switching means such as specifying with a key switch according to the sensitivity edge.

一発明の効果− 以１−の説明から明らかなように、本発明は、露光ラン
プの輝度を感光体の感度に応じて複数段に切換調整する
！、１１換手段を備えるようにしたため、感光体の露光
調整に煩わしい試し複写を不要にして製造−ヒ及び保守
とでの調整を容易にする効果がある。また、装置構成玉
は抵抗回路と切換スイッチによる切換スイッチ回路など
、構成が複雑高価になることは無い。Effects of the Invention - As is clear from the explanation in 1 below, the present invention switches and adjusts the brightness of the exposure lamp in multiple steps according to the sensitivity of the photoreceptor! , 11 conversion means is provided, which eliminates the need for troublesome trial copying for exposure adjustment of the photoreceptor, thereby facilitating adjustment during manufacturing and maintenance. In addition, the device components are not complicated and expensive, such as a changeover switch circuit consisting of a resistor circuit and a changeover switch.

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

図は本発明の一実施例を示す回路図である。 ■・・・露光ランプ、　　４・・・露光ランプ制御部、
５・・・電圧検出器、　　６・・・ゲート回路、７・・
・温度検出器、　　８・・・複写枚数精算器、９・・・
輝度設定器、　　１０・・・加算器、１１・・・切換ス
イッチ回路。The figure is a circuit diagram showing one embodiment of the present invention. ■...Exposure lamp, 4...Exposure lamp control section,
5... Voltage detector, 6... Gate circuit, 7...
・Temperature detector, 8... Copy number calculator, 9...
Brightness setting device, 10...adder, 11...changeover switch circuit.

Claims (1)

【特許請求の範囲】[Claims] １）露光ランプの輝度を制御する露光ランプ制御手段と
、この露光ランプ制御手段の輝度制御量を感光体の感度
に応じて複数段に切換調整する切換手段とを備えたこと
を特徴とする電子写真複写装置。1) An electronic device comprising an exposure lamp control means for controlling the brightness of an exposure lamp, and a switching means for switching and adjusting the brightness control amount of the exposure lamp control means in a plurality of steps according to the sensitivity of the photoreceptor. Photocopying equipment.