JPS63292172A - Electrostatic recorder - Google Patents
Electrostatic recorderInfo
- Publication number
- JPS63292172A JPS63292172A JP12948087A JP12948087A JPS63292172A JP S63292172 A JPS63292172 A JP S63292172A JP 12948087 A JP12948087 A JP 12948087A JP 12948087 A JP12948087 A JP 12948087A JP S63292172 A JPS63292172 A JP S63292172A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- developing device
- density
- image
- information
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 11
- 230000007423 decrease Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 108091008695 photoreceptors Proteins 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 206010047571 Visual impairment Diseases 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000001454 recorded image Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003595 spectral effect Effects 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
-
- 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
- G03G15/5033—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 photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は黒色の他にカラーの記録像も形成し得るように
複数の現像器を設けた静電記録装置に関するもので、特
に現像器へのトナー補給に新たな改良を行った静電記録
装置に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electrostatic recording device equipped with a plurality of developing devices so as to be able to form color recorded images in addition to black. This invention relates to an electrostatic recording device with new improvements in toner replenishment.
電子写真複写機やファクシミリあるいはある種のレーザ
プリンタなどの静電記録装置は記録すべき像のＯＸ潜像
を感光体上に形成し、この静電潜像をトナーを含む現像
剤により現像して可視像とした後記録紙上に溶融定着し
て最終的な記録像を得ている。静電潜像を現像して可視
像とするために現像装置が設けられており、その現像容
器にはトナーを含む現像剤がたくわえられでいる。現像
剤にはキャリヤと呼ばれる磁性体粉とトナーと呼ばれる
着色樹脂微粒子とから成る二成分系現像剤と、ｊＭＷｔ
中に磁性体および必要により着色剤を含有せしめた磁性
を有するトナーがら成る一成分系現像剤とがあるが、カ
ラー用現像剤としては一成分系現像剤を用いた場合、磁
性体を含有させなければならないため彩度及び明度の高
いものが得られず、鮮明なカラー像を得るためには二成
分系現像剤が用いられる。Electrostatic recording devices such as electrophotographic copying machines, facsimile machines, and some types of laser printers form an OX latent image of the image to be recorded on a photoreceptor, and develop this electrostatic latent image with a developer containing toner. After making it into a visible image, it is melted and fixed onto recording paper to obtain the final recorded image. A developing device is provided to develop the electrostatic latent image into a visible image, and a developer containing toner is stored in the developing device. The developer is a two-component developer consisting of magnetic powder called carrier and colored resin fine particles called toner, and jMWt.
There is a one-component developer that consists of a magnetic toner that contains a magnetic material and, if necessary, a coloring agent, but when a one-component developer is used as a color developer, it does not contain a magnetic material. Because of this, it is not possible to obtain high chroma and brightness, and in order to obtain clear color images, a two-component developer is used.
また、黒色現像剤もカラー現像剤と共に使用される場合
は現像装置の複雑化を防ぐため通常二成分系現像剤が使
用される。上記二成分系現像剤においては、現像が行わ
れるに従つでトナーが消費され、現像剤のトナー濃度が
減少し、その結果同一の潜像を現像しても得られる画像
濃度が低下する。Further, when a black developer is used together with a color developer, a two-component developer is usually used to prevent the development device from becoming complicated. In the above two-component developer, as development is performed, toner is consumed and the toner concentration of the developer decreases, resulting in a decrease in image density obtained even if the same latent image is developed.
このため現像剤のトナー濃度を検知して、そのトナー濃
度に応じたトナー補給を行い一定のトナー濃度の状態を
保持することが必要である。Therefore, it is necessary to detect the toner concentration of the developer and replenish toner according to the detected toner concentration to maintain a constant toner concentration state.
トナー補給は、現像装置とは別個に設けられたトナー補
給装置に予めトナーを収納しておき、トナーが不足した
ときに手動または自動的にトナー補給装置から一定量の
トナーを現像装置に補給して行なっている。また上述し
たトナー濃度の検出方法としては種々の方法が知られて
おり、その一つに複写機の原稿台の一部に基準濃度片を
貼付け、この濃度片のトナー像を感光体ドラムの一部に
形成しそのトナー像の濃度を光学的に測定する方法が知
られている。この光学的方法のほかに現像剤に流れる電
流値によりトナー濃度を検知する電気的方法などがある
。Toner replenishment involves storing toner in advance in a toner replenishing device installed separately from the developing device, and then manually or automatically replenishing a certain amount of toner from the toner replenishing device to the developing device when toner is insufficient. is being carried out. Various methods are known for detecting the toner density as described above. One of them is to attach a reference density piece to a part of the document table of a copying machine, and transfer the toner image of this density piece to one of the photoreceptor drums. A method is known in which the density of a toner image is optically measured. In addition to this optical method, there is an electrical method that detects the toner concentration based on the value of the current flowing through the developer.
一方、このようなトナー濃度検知手段は設けずに一定枚
数記録するごとに一定量のトナーを補給するようにした
記録装置も知られている。On the other hand, there is also known a recording apparatus that does not include such a toner density detection means and instead replenishes a fixed amount of toner every time a fixed number of sheets are printed.
上記基準濃度片を備えそのトナー像の濃度を光学的に測
定し、その測定値から黒色やカラーの現像剤のトナー濃
度を検出する方法においては、感光体上に形成された黒
色及びカラーのトナー像のそれぞれの分光反射率が異な
るため、トナー濃度制御手段の設定条件を使用する現像
剤の色によってそれぞれ変更しなければならず、コ支ト
の増大や制御配線が複雑になるという問題点があった。In the method in which the above reference density piece is provided, the density of the toner image is optically measured, and the toner density of the black or color developer is detected from the measured value, the toner density of the black or color developer formed on the photoreceptor is Since the spectral reflectance of each image is different, the setting conditions of the toner density control means must be changed depending on the color of the developer used, which poses problems such as increased support and complicated control wiring. there were.
また、一定枚数記録するごとに一定量のトナーを補給す
るようにした記録装置は、写真のような平均濃度の濃い
原稿やＡ３のような大きな原稿は記録１回当りのトナー
消費量が多いのでこのような原稿を連続して記録すると
トナー補給をしてもトナーが次第に不足していき画像濃
度が下って画質が低下する。逆に、トナー消費量の少な
いＢ５のような原稿が多い場合や、原稿サイズがたとえ
ばＡ３であっても、Ａ４への縮小記録を行えば等倍記録
より少ないトナー消費量ですむ場合はトナー濃度が次第
に濃くなりトナーの飛散や地力ブリが生じ易いという問
題点があった。Additionally, recording devices that replenish a certain amount of toner each time a certain number of sheets are recorded consume a large amount of toner per recording for originals with a high average density such as photographs or large originals such as A3. When such originals are continuously recorded, toner gradually becomes insufficient even if toner is replenished, resulting in a decrease in image density and image quality. On the other hand, if there are many originals such as B5, which consumes less toner, or even if the original size is A3, reducing the size to A4 will require less toner consumption than recording at full size. There is a problem in that the toner gradually becomes darker, which tends to cause toner scattering and soil blurring.
本発明は上記の点を解決し、装置の製造コストを増大さ
せることなく、記録すべき原稿の濃度やサイズに応じて
トナー補給を的確に行い、常に一定した画像濃度が得ら
れる静電記録装置を提供することを目的とする。The present invention solves the above problems and provides an electrostatic recording device that can accurately replenish toner according to the density and size of the document to be recorded without increasing the manufacturing cost of the device, and can always obtain a constant image density. The purpose is to provide
上記目的は感光ドラム周縁部に少なくとも２つの現像器
を設けて現像を行う静電記録装置において、それぞれの
現像器は現像器内へトナー補給を行うトナー供給手段を
有していて、１つの現像器は感光体上に形成された基準
濃度片トナー像の反射濃度情報に基づいてトナー補給手
段を制御し、他の少なくとも１つの現像器においては転
写材の情報及び／又は原稿の情報に応じてトナー補給手
段を制御することを特徴とする静電記ａｉｉ！！にょっ
て達成される。The above object is an electrostatic recording device that performs development by providing at least two developing devices on the peripheral edge of a photosensitive drum, each developing device having a toner supply means for replenishing toner into the developing device, The device controls the toner replenishing means based on the reflection density information of the standard density strip toner image formed on the photoreceptor, and the at least one other developing device controls the toner replenishing means according to the information of the transfer material and/or the information of the document. Electrostatic recording aii! characterized by controlling a toner replenishing means! ! It is achieved by Nya.
以下本発明を図面に基づいて説明する。 The present invention will be explained below based on the drawings.
第１図は本発明の一実施例を示す静電記録装置として２
色カラー複写機のｖＩ戊概要を示したものである。複写
機本体の上面には原稿台〃ラス１が設けられ、また上面
性端縁部には表示器、テンキー、色指定（現像装置選択
）ボタン、露光設定ボリューム、転写紙サイズ選択ボタ
ン、複写開始ボタン等を配置した振作盤（図示せず）が
設けられている。原稿台ガラス１の面上に原ＩＤをセッ
トして複写開始ボタンを操作すると、露光用光源３が原
１＄Ｄを相対的に露光走査して、その原稿りの光像が結
像レンｒ４ｍを含む露光波ｆｉ４を経由して像形成用感
光体としての感光ドラム２の表面に導かれろ。FIG. 1 shows an electrostatic recording device showing an embodiment of the present invention.
This is an overview of a color copying machine. The upper surface of the copying machine body is equipped with a document table (Last 1), and the upper edge has a display, numeric keys, color specification (developing device selection) button, exposure setting volume, transfer paper size selection button, and copy start button. A shaking board (not shown) on which buttons and the like are arranged is provided. When the original ID is set on the surface of the original platen glass 1 and the copy start button is operated, the exposure light source 3 relatively exposes and scans the original 1$D, and the light image of the original is transferred to the imaging lens r4m. is guided to the surface of the photosensitive drum 2, which serves as an image forming photosensitive member, via an exposure wave fi4 containing .
感光ドラム２は接地された金属筒の外周面にセレンやＯ
ＰＣ等の光導電層を設けたもので、上記の露光走査と連
動して矢印（時計）方向に回転する。The photosensitive drum 2 has selenium or O on the outer circumferential surface of a grounded metal cylinder.
It is provided with a photoconductive layer such as PC, and rotates in the direction of the arrow (clockwise) in conjunction with the exposure scanning described above.
感光ドラム２の周縁部には帯電極５、露光波５！４、後
述する２色カラーの現像器ａ ｔＯ，松写？！！極６、
分、１ＩＴＩｔ極及び分離爪からなる分＃ｌ装置７、お
よびクリーニング装ｒ！１８、残像消去装置９が順次配
置されている。At the periphery of the photosensitive drum 2, there is a charged electrode 5, an exposure wave 5!4, and a two-color developer (described later). ! ! pole 6,
minute, minute #l device 7 consisting of 1ITIt pole and separation claw, and cleaning device r! 18, afterimage erasing devices 9 are arranged in sequence.
この感光ドラム２は光像が月未する以前に、直流高圧が
印加された帯電極５によって上記光導電層が例えば正に
一様に帯電されており、この状態の光導電層が光像を受
けると、その光を受けた部分の導電率が高くなってその
部分の帯電電荷が金属筒に逃げ、暗い部分には明暗の程
度に応じて正の電荷が残るようになり、これによって光
導電層の面に原稿の像に対応した静電潜像が形成される
。In this photosensitive drum 2, before the optical image is formed, the photoconductive layer is charged uniformly, for example, by a charging electrode 5 to which a DC high voltage is applied, and the photoconductive layer in this state forms an optical image. When exposed to light, the conductivity of the part that receives the light increases, and the electrical charge in that part escapes to the metal tube, leaving a positive charge in the dark part depending on the degree of brightness, and this causes photoconductivity. An electrostatic latent image corresponding to the image of the original is formed on the surface of the layer.
本実施例での現像装置１０は、２色カラーの現像ｖｃｒ
！１であって、上側に位置した上側現像器１１Ａと、下
側に位置した下側現像器１１Ｂとが一体にかっ描動可能
となっている。一方現像装Ｗ１１０の外部に位置した紬
１２の背後にはモータ （図示せず）が設けられていて
、色指定（現像装置選択）ボタンの選択によってモータ
は回動し、モータの回動によって軸１２に固設したカム
１３が回動するようになっている。そしてカム１３は現
像器Ｗ１１０の当接部１４Ａまたは当接部１４Ｂを押圧
した状態で停止する。カム１３が当接部１４Ａを押圧し
た状態にあっては現像装置１０をバネ部材１５Ａを介し
て反時計方向に描動させ、上側現像器１１Ａの現像スリ
ーブ１１１Ａを感光ドラム２表面と予しめ設定した小間
隙をもって対置した位置で停止し、上側現像器１１Ａに
よる現像がなされる。また色指定（現像装置選択）ボタ
ンの他の選択によってはカム１３が現像器ｒ！１１ｏの
当接部１４Ｂを押圧し、現像装置１ｏをバネ部材１５Ｂ
を介して時計方向に描動させ、下側現像器１１［３の現
像スリーブ１１１ Ｂを感光ドラム２表面と予しめ設定
した小間隙をもって対置した位置で停止し、下側現像器
１１Ｂによる現像がなされる。The developing device 10 in this embodiment is a two-color developing VCR.
! 1, an upper developing device 11A located on the upper side and a lower developing device 11B located on the lower side can be moved integrally. On the other hand, a motor (not shown) is provided behind the pongee 12 located outside the developing device W110, and the motor rotates when the color designation (developing device selection) button is selected. A cam 13 fixed to 12 is configured to rotate. The cam 13 then stops while pressing the contact portion 14A or 14B of the developing device W110. When the cam 13 presses the contact portion 14A, the developing device 10 is moved counterclockwise via the spring member 15A, and the developing sleeve 111A of the upper developing device 11A is set in advance with the surface of the photosensitive drum 2. The upper developing device 11A stops at a position opposite to each other with a small gap therebetween, and develops the image using the upper developing device 11A. Also, depending on other selections of the color designation (developing device selection) button, the cam 13 is set to the developing device r! 11o, and press the developing device 1o with the spring member 15B.
The developing sleeve 111B of the lower developing device 11[3 is stopped at a position opposite to the surface of the photosensitive drum 2 with a preset small gap, and the developing sleeve 111B of the lower developing device 11B is stopped. It will be done.
本実施例では上側現像器１１Ａには赤トナーを含む二成
分赤色現像剤、下側現像器１１Ｂには黒トナーを含む二
成分黒色現像剤を収納していて、撹拌部材１１２Ａ又は
１１２Ｂによって夫々の二成分系現像剤は均一に撹拌さ
れるとともにトナーはマイナスに帯電する。また上側現
像器１１Ａで現像によってｔｌｉ費された赤トナーに対
しては、ホッパー１１３Ａ内に内蔵された赤トナーが補
給スクリユ１１４Ａの回転によって上側現像器ｌｌＡ内
に落下し、赤トナーの補給がなされる。下側現像器１１
Ｂについても同様であるが、黒トナーを内蔵したホッパ
ー１１３Ｂは装置の前面側に位置していてトナー補給が
なされるので、ホッパー１１３Ｂ、補給スクリユ１１４
Ｂについては図示されていない。In this embodiment, the upper developing device 11A stores a two-component red developer containing red toner, and the lower developing device 11B stores a two-component black developer containing black toner. The two-component developer is uniformly stirred and the toner is negatively charged. Furthermore, for the red toner that has been wasted during development in the upper developing device 11A, the red toner contained in the hopper 113A falls into the upper developing device llA by the rotation of the replenishment screw 114A, and the red toner is replenished. Ru. Lower developing device 11
The same goes for B, but since the hopper 113B containing black toner is located on the front side of the device and replenishes toner, the hopper 113B and replenishment screw 114
B is not shown.
前記の感光ドラム２の静電潜像の形成された部分が上側
現像器１１Ａの現像スリーブ１１１Ａ又は下側現像器１
１Ｂの現像スリーブ１１１Ｂの部分に至ると、感光ドラ
ム２２！２面の残っている正電荷の部分に負電荷をもっ
た赤トナー又は黒トナーが靜電力で吸着される。この結
果、感光ドラム２の表面には静電潜像に応じた赤色トナ
ー像又は黒色トナー像が形成される。The portion of the photosensitive drum 2 on which the electrostatic latent image is formed is the developing sleeve 111A of the upper developing device 11A or the lower developing device 1.
When reaching the developing sleeve 111B portion 1B, negatively charged red toner or black toner is attracted to the remaining positively charged portion of the photosensitive drum 22!2 surface by the static electricity. As a result, a red toner image or a black toner image is formed on the surface of the photosensitive drum 2 according to the electrostatic latent image.
一方、転写紙サイズ選択ボタンによって選択されたカセ
ット２１内の松写材である転写紙Ｐはその先端と上記ト
ナー像の先端とが一致するようなタイミングで給紙ロー
ラ２２によって送り出され、その送り出された転写紙Ｐ
に直流電圧が印加された松写？！極６によって、上記感
光ドラム２の表面のトナー像が転写される。On the other hand, the transfer paper P, which is a pine photographic material in the cassette 21 selected by the transfer paper size selection button, is fed out by the paper feed roller 22 at a timing such that its leading edge coincides with the leading edge of the toner image. Transfer paper P
Matsusha with DC voltage applied to it? ! The toner image on the surface of the photosensitive drum 2 is transferred by the pole 6 .
この後、交流高圧が印加された分離極及び分離爪からな
る分離表ｒ！１７によって転写紙Ｐは感光ドラム２から
分離され、搬送ベルト２３によって図示しない定着装置
に送られてトナー像が定着され、記録装置外に設けた受
は皿に排出される。また転写紙Ｐ上にトナー像を転写し
た後、感光ドラム２゛の周面上に残った残留トナーはク
リーニング装置８によって清掃され、更に残像消去装ｒ
！１９によって感光体２上の電位を一定レベル以下に落
とし、次のコピー動作が可能の状態となる。After this, a separation table consisting of separation electrodes and separation claws to which AC high voltage was applied! The transfer paper P is separated from the photosensitive drum 2 by a conveyance belt 23, and the toner image is fixed thereon by a conveyance belt 23, and then discharged onto a tray provided outside the recording apparatus. Further, after the toner image is transferred onto the transfer paper P, the residual toner remaining on the circumferential surface of the photosensitive drum 2' is cleaned by a cleaning device 8, and an afterimage erasing device r
! 19, the potential on the photoreceptor 2 is lowered to a certain level or less, and the next copying operation becomes possible.
１７は原稿台プラス１の一端に接して設けられた基準濃
度片、１８は基準濃度片１７の感光ドラム２上に形成さ
れたトナー像の反射濃度を検知するトナー濃度センサ、
１６は露光用光源３に沿って並設され、かつ露光用光源
３と共に／ＪＸ稿りを走査して原稿の反射濃度を検知す
る原稿濃度センサである。17 is a reference density piece provided in contact with one end of the document table plus 1; 18 is a toner density sensor that detects the reflection density of the toner image formed on the photosensitive drum 2 on the reference density piece 17;
A document density sensor 16 is arranged along the exposure light source 3 and scans the JX document together with the exposure light source 3 to detect the reflection density of the document.
次に本発明の０電記録装置におけるトナー濃度制御につ
いて説明する。Next, toner density control in the zero-voltage recording apparatus of the present invention will be explained.
先ず、上側現像器１１Ａに収納されたカラー現像剤の赤
トナー濃度の制御について述べろ。First, the control of the red toner concentration of the color developer stored in the upper developing device 11A will be described.
ＭＳ２図６）及び（ｂ）は現像剤中のトナー濃度を制御
する制御系を示すブロック図で、第２図（、）において
、３１は原稿濃度情報、３２は転写材サイズ情報、３５
は制御部のＣ２０，３６Ａは上側現像器１１Ａのトナー
補給手段である上トナー補給部で、トナーを収納するホ
ッパー１１３Ａとそのトナーを上側現像器１１Ａに搬送
する補給スクリュ１１４Ａからなり、補給スクリュ１１
４Ａは図示されない毫−夕により回転されるように構成
されている。MS2 Figures 6) and (b) are block diagrams showing the control system for controlling the toner concentration in the developer. In Figure 2 (,), 31 is original density information, 32 is transfer material size information, and 35
C20, 36A of the control section is an upper toner replenishing section which is a toner replenishing means for the upper developing device 11A, and is composed of a hopper 113A that stores toner and a replenishing screw 114A that conveys the toner to the upper developing device 11A.
4A is configured to be rotated by a motor (not shown).
後述する下側現像器１１Ｂのトナー補給手段である下ト
ナー補給部３６Ｂも同様にホッパー１１３Ｂと補給スク
リュ１１４Ｂから構成されている。A lower toner replenishing section 36B, which is a toner replenishing means for the lower developing device 11B, which will be described later, is similarly composed of a hopper 113B and a replenishing screw 114B.
３７は後述するトナー濃度検出回路で、下トナー補給部
３６Ｂの制御系統は点線で示している。37 is a toner concentration detection circuit which will be described later, and a control system for the lower toner replenishing section 36B is shown by a dotted line.
現像剤の１コピー当りのトナー消費量は経験的に原稿の
平均濃度と転写紙のサイズによってほぼ決るので、ＣＰ
ｔ１３５は原稿濃度情報３１と転写材サイズ情報３２に
よってトナー補給部３６Ａを制御して現像剤のトナー濃
度を常に適正な範囲に維持する。The amount of toner consumed per copy of developer is empirically determined by the average density of the original and the size of the transfer paper, so CP
At t135, the toner replenishing section 36A is controlled based on the original density information 31 and the transfer material size information 32 to maintain the toner density of the developer always within an appropriate range.
転写材サイズを直接知ることのできない自動式装置にお
いては、原稿サイズ情報と複写倍率情報から転写材サイ
ズを求めることができる。この場合の制御系統はｆｉＳ
２図（ｂ）のようになり、図において、３３は原稿サイ
ズ情報、３４は複写倍率情報である。In an automatic device in which the size of the transfer material cannot be directly known, the size of the transfer material can be determined from the document size information and the copying magnification information. The control system in this case is fiS
The information is as shown in FIG. 2(b), where 33 is original size information and 34 is copy magnification information.
原稿濃度情報は第１図に示した原稿濃度センサ１６によ
って得られるが、この他に原稿から感光ドラムまでの光
路中に設けた受光センサでＩｇ、Ｍからの反射光を受光
し、受光センサがら出力′する光電流を増幅しサンプリ
ングして作成した濃度ヒストグラムを用いる方法などの
公知の手段を用いてもよい。この濃度ヒストグラムを用
いた場合はヒストグラムの拡がりから原稿が文字の多い
線画が写真の多い階調画かを判別することができる。Document density information is obtained by the document density sensor 16 shown in FIG. Known means may be used, such as a method using a density histogram created by amplifying and sampling the output photocurrent. When this density histogram is used, it can be determined from the spread of the histogram whether the original is a line drawing with many characters or a gradation drawing with many photographs.
また原稿サイズの検知は、原稿弁えカバーに設けた投光
装置と原稿台下側に設けた充電変換装置とを用い光電変
換装置の出力から原稿サイズを検出する方法や、原稿弁
えカバーの押え面に設けた複数の線状マークを光源で照
射しマークの数を受光素子で読取る方法など、いずれの
公知の手段を用いてもよい。In addition, the document size can be detected by detecting the document size from the output of a photoelectric conversion device using a light emitter installed on the document cover and a charging conversion device installed below the document table, or by Any known method may be used, such as a method of illuminating a plurality of linear marks provided on the pressing surface with a light source and reading the number of marks with a light receiving element.
トナーの補給は補給スクリュ１１４Ａ、 １１４Ｂを駆
動するモータへの通電時間を制御してその量を調節する
ことができる。The amount of toner replenishment can be adjusted by controlling the energization time to the motors that drive the replenishment screws 114A and 114B.
下の表１は、文字の比較的多い文字原稿と写真の比較的
多い写真原稿の２１！類について原稿サイズごとの１コ
ピー当りのトナー消費ｉｔ （ｍｇ）と本実施例でのト
ナー補給モータの通電時間とを示したものである。Table 1 below shows 21 text manuscripts with a relatively large number of characters and photo manuscripts with a relatively large number of photographs. 2 shows the toner consumption it (mg) per copy for each original size and the energization time of the toner replenishment motor in this embodiment.
表 １
なお、上記の表ではトナー補給モータを連続し１分間回
転したときトナー供給量が５ｇ／分となるものを用いた
。Table 1 In the above table, the toner replenishment motor was used in which the toner supply amount was 5 g/min when the toner replenishment motor was continuously rotated for 1 minute.
トナー補給量を調整するには上記例のようにモータへの
通電時間を制御するほかに、回転数や供給電圧などの電
気的７アクタのほかに機械的手段を制御してもよい。To adjust the amount of toner replenishment, in addition to controlling the energization time to the motor as in the above example, it is also possible to control mechanical means in addition to electrical actors such as the number of revolutions and supply voltage.
また、（ナー補給の方法は上記補給スクリュ１１４Ａ、
１１４Ｂの代りに電磁弁を備え、この電磁弁の開放時間
なＩＩＩ ’ｍする方法、あるいは周面にトナーが入り
込むに適したような溝を備えた供給ローラを設けて、供
給ローラの回転に伴ってトナー補給を行う方法もあり、
さらに静電的に供給ローラの局面にトナーを付着させ、
現像器１１Ａ、ＩＩＢ内でスフレバーによって付着した
トナーをはぎ取るようにして、上記供給ローラの回転数
あるいは回転時間を制御してトナー補給量を３１ｍする
方法などがあり、何れについても利用することができる
。In addition, (the method of supplying the fuel is the supply screw 114A,
114B may be replaced by a solenoid valve, and the opening time of this solenoid valve may be changed.Alternatively, a supply roller may be provided with grooves on its circumferential surface suitable for the toner to enter, and the supply roller may rotate as the supply roller rotates. There is also a method of replenishing toner.
Furthermore, the toner is electrostatically attached to the surface of the supply roller.
There is a method in which the toner adhering to the developing units 11A and IIB is removed by a souffle bar, and the number of rotations or the rotation time of the supply roller is controlled to increase the amount of toner replenishment to 31 m, and any of these methods can be used. .
以上のように原稿の濃度とトナーが付着する面積である
転写材サイズに応じたトナー１が補給されるので、現像
剤中のトナー濃度を常に適正な濃度範囲に維持すること
ができる。As described above, since the toner 1 is replenished according to the density of the document and the size of the transfer material, which is the area on which the toner adheres, the toner density in the developer can always be maintained within an appropriate density range.
以上の説明は上側に位置したカラー泪の現像器が１個の
場合について述べたがカラー用の現像器が複数の場合で
も、それぞれ収納しているトナーの種類例えば赤色、青
色等の現像剤に応じた適正補給量になるようトナー補給
部のモータの通電時間を決めてトナー補給を行うことに
よって多色のカラー用の現像器についても目的を達する
ことがでさる。The above explanation is based on the case where there is only one color developing device located on the upper side, but even if there are multiple color developing devices, depending on the type of toner stored in each, such as red, blue, etc. By replenishing toner by determining the energization time of the motor of the toner replenishing unit so that the appropriate replenishment amount is obtained, the purpose can be achieved even in a multi-color developing device.
次にカラーに較べ使用頻度が高くトナー消費量も一般に
多い黒色現像剤のトナー濃度制御について説明する。Next, toner concentration control for black developer, which is used more frequently and generally consumes more toner than color developer, will be explained.
第３図は第１図の濃度センサ１８の断面を示すもので、
本体１８ａに形成した光通路１８ｂ内に臨むように発光
素子としてのＬＥＤ （発光ダイオード）１８ｄを設け
、また光進路１８ｃ内に臨むように受光素子としてのホ
トトランジスタ１８ｅを設け、ＬＥＤ１８ｄから照射し
た光が光通路１８ｂを通過して感光ドラム２の表面（基
準画像面）で反射し、光通路１８ｃを経由してホトトラ
ンジスタ１８ｅに入射するように構成されている。そし
て、ＬＥＤ１８ｄには照射光のピーク波長が例えば９５
０ｎ＠に設定され、ホトトランジスタ１８ｅには、少な
くとも上記波長の光に感度のあるものが使用されている
。FIG. 3 shows a cross section of the concentration sensor 18 shown in FIG.
An LED (light emitting diode) 18d as a light emitting element is provided so as to face into the optical path 18b formed in the main body 18a, and a phototransistor 18e as a light receiving element is provided so as to face into the optical path 18c. The light passes through the optical path 18b, is reflected on the surface of the photosensitive drum 2 (reference image surface), and enters the phototransistor 18e via the optical path 18c. For example, the peak wavelength of the irradiated light on the LED 18d is 95
0n@, and the phototransistor 18e is sensitive to at least the above wavelength of light.
第４図は濃度センサ１８がらの検知信号を処理して画像
濃度信号を得るためのトナー濃度検出回路３フを示すも
のである。濃度センサ１８のＬＥＤ１８ｄは電源Ｖｃｃ
に順方向に保護抵抗Ｒ１と直列接続されている。ホトト
ランジスタ１８ｅは電源Ｖｃａと演算増幅器１９の非反
転入力端子と間に接続されている。FIG. 4 shows the toner density detection circuit 3 for processing the detection signal from the density sensor 18 to obtain an image density signal. The LED 18d of the concentration sensor 18 is connected to the power supply Vcc.
The protection resistor R1 is connected in series with the protection resistor R1 in the forward direction. The phototransistor 18e is connected between the power supply Vca and the non-inverting input terminal of the operational amplifier 19.
この演算増幅器１９の反転入力端子には？ｌ源電圧■ｅ
ｃを抵抗Ｒ２とＲ３で分割した電圧が印加され、その出
力端子は帰還抵抗Ｒ４に接続されると共にコンパレータ
２０の反転入力端子に接続されている。What is the inverting input terminal of this operational amplifier 19? l Source voltage ■e
A voltage obtained by dividing c by resistors R2 and R3 is applied, and its output terminal is connected to the feedback resistor R4 and to the inverting input terminal of the comparator 20.
このコンパレータ２０の非反転入力端子には電ｒＡＷ１
圧Ｖｃｃを抵抗Ｒ５とＲ６で分割した電圧が比較基準電
圧として入力しでいる。The non-inverting input terminal of this comparator 20 has a voltage rAW1
A voltage obtained by dividing voltage Vcc by resistors R5 and R6 is input as a comparison reference voltage.
ホトトランジスタ１８ｅは入射する反射光量が多い（感
光ドラム２上のトナー濃度が薄い）はど、そのホトトラ
ンジスタ１８ｅのエミッタ電流が多く、この電流は演算
増幅器１９で電圧に変換され、増幅される。そして、そ
の演算増幅１！Ｊ１９からの出力はホ））ランジスタ１
８ｅへの反射光量が多いほど上昇して、次段のコンパレ
ータ２０に入力する。そして、このコンパレータ２０に
おいて、ＩＸＸ大入力端子の演算増幅器１９からの出力
が、非反転入力端子に印加している基準電圧よりも上昇
すると、出力電圧がローレベルとなり、検知したトナー
像の濃度が所定値より低いことを示す。When the amount of reflected light incident on the phototransistor 18e is large (the toner concentration on the photosensitive drum 2 is low), the emitter current of the phototransistor 18e is large, and this current is converted into a voltage by the operational amplifier 19 and amplified. And that operational amplification 1! The output from J19 is e)) transistor 1
The larger the amount of light reflected to 8e, the higher the amount of light is input to the comparator 20 at the next stage. In this comparator 20, when the output from the operational amplifier 19 at the IXX large input terminal rises above the reference voltage applied to the non-inverting input terminal, the output voltage becomes a low level and the density of the detected toner image decreases. Indicates that the value is lower than a predetermined value.
このようにして検知された濃度低下を示す信号はＣＰＵ
３５に送られる （第２図（ａ）、 （ｂ）点線参照）
。The signal indicating the concentration decrease detected in this way is sent to the CPU
35 (see dotted lines in Figure 2 (a) and (b))
.
ＣＰＵ３５は下トナー補給部３６Ｂの補給スクリユ１１
４Ｂを駆動するモータに一定時間通電して黒色トナーを
一定量補給して、トナー濃度を上昇させる。The CPU 35 is connected to the replenishment screw 11 of the lower toner replenishment section 36B.
The motor that drives 4B is energized for a certain period of time to replenish a certain amount of black toner to increase the toner density.
そうして使用により再びトナー濃度が低下すると上記濃
度低下信号がＣＰＵ３５に送られ再び一定量の黒色トナ
ーが補給されて、現像剤のトナー濃度が一定範囲に保持
される。When the toner concentration decreases again due to use, the concentration decrease signal is sent to the CPU 35, and a certain amount of black toner is replenished again, so that the toner concentration of the developer is maintained within a certain range.
以上のようにして、上下の現像器１１Ａ及（／ＩＩＢの
現像Ｍのトナー濃度を常に適正な一定範囲に保持する。As described above, the toner density of the upper and lower developing devices 11A and (/IIB) is always maintained within an appropriate range.
従って常に良好な画像濃度を維持することができる。Therefore, good image density can always be maintained.
以上説明したように、本発明の静電記録装置においては
、一つの現像器１例えば使用頻度の高い黒色用の現像器
は基準濃度片のトナー像の反射濃度に基づいてトナー補
給手段を制御し、他の少なくとも一つの現像器９例えば
赤色等のカラー現像器においては転写付属Ｖ／又は原稿
の情報に応じてトナー補給手段を制御する構成としたの
で、トナーの色の相異によって制御手段の設定条件を変
更するために生ずる複雑化を防ぎ、制御手段の製造コス
トの増大、故障発生率の増大を防ぎ、黒色やカラー等を
選択的に現像することができるようにした記録装置にお
いてその何れについでも、常に適正な画像濃度を得るこ
とのできる静電記録装置を提供できることとなった。As explained above, in the electrostatic recording apparatus of the present invention, one developing device 1, for example, a frequently used developing device for black color, controls the toner replenishing means based on the reflection density of the toner image of the reference density piece. In at least one other developing device 9, for example, a color developing device such as red, the toner replenishing means is controlled according to the transfer attachment V/or document information, so that the control means is controlled depending on the difference in toner color. In a recording device that prevents complication caused by changing setting conditions, increases the manufacturing cost of the control means, and increases the failure rate, and enables selective development of black, color, etc. It has now become possible to provide an electrostatic recording device that can always obtain an appropriate image density.
ｍｉ図は本発明の一実施例を示す２色カラー複写機の構
ＪＩｔ概要を示す図、第２図（＆）及び（ｂ）は現像剤
中のトナー濃度を制＊する制御系を示すブロック図、第
３図は第１図のトナー濃度センサの断面図、第４図は第
２図のトナー濃度検出回路を示す回路図である。
図において、
１−ｍ−原稿台、がラス、２−−一感光ドラム、３−ｍ
−露光用光源、４−ｍ−露光装置、５−ｍ−帯電極、６
−−−転写電極、７−−−分離装置、８−−−クリーニ
ング装置、９−ｍ−残像消去装置、１０−−一現像装置
、ＩＩＡ−ｍ−上側現像器、１１Ｂ−−−下ｆｌｌｌ現
（を器、１６−−−ｉ Ｗｉ ａ度セン？、１７一−−
基準濃度片、１８−−− ）ナー濃度センサ、３１−ｍ
−原稿濃度情報、３２・−転写材サイズ情報、３３−−
一原稿サイズ情報、３４・−複写倍率情報、３５−−−
ＣＰＵ、 ３６Ａ−−ｍ１トナー補給部、３６Ｂ−・下
トナー補給部、３７−）ナー濃度検出回路、Ｄ−ｍ−原
稿、Ｐ−−一転写紙である。
出願人 小西六写真工業株式会社
第２図
（ａ−〕The mi diagram is a diagram showing an overview of the structure of a two-color copying machine showing an embodiment of the present invention, and Figures 2 (&) and (b) are blocks showing a control system for controlling the toner concentration in the developer. 3 is a sectional view of the toner concentration sensor of FIG. 1, and FIG. 4 is a circuit diagram showing the toner concentration detection circuit of FIG. 2. In the figure, 1-m-document stand, glass lath, 2--photosensitive drum, 3-m
- exposure light source, 4-m-exposure device, 5-m-charged electrode, 6
---Transfer electrode, 7--Separation device, 8--Cleaning device, 9-m-Afterimage erasing device, 10--Developing device, IIA-m-Upper developing device, 11B--Lower full developing device. (A device, 16--i Wi a degree sen?, 17--
Reference concentration piece, 18----)ner concentration sensor, 31-m
- Original density information, 32 - Transfer material size information, 33 -
1 Original size information, 34・-Copy magnification information, 35---
CPU, 36A--m1 toner replenishment section, 36B--lower toner replenishment section, 37-) toner density detection circuit, D-m-original, P--transfer paper. Applicant Konishiroku Photo Industry Co., Ltd. Figure 2 (a-)
Claims (1)
像を行う静電記録装置において、それぞれの現像器は現
像器内へトナー補給を行うトナー供給手段を有していて
、１つの現像器は感光体上に形成された基準濃度片トナ
ー像の反射濃度情報に基づいてトナー補給手段を制御し
、他の少なくとも１つの現像器においては転写材の情報
及び／又は原稿の情報に応じてトナー補給手段を制御す
ることを特徴とする静電記録装置。In an electrostatic recording device that performs development by providing at least two developing devices at the peripheral portion of the photosensitive drum, each developing device has toner supply means for replenishing toner into the developing device, and one developing device The toner replenishing means is controlled based on the reflection density information of the standard density piece toner image formed on the body, and the toner replenishing means is controlled in accordance with the information of the transfer material and/or the information of the document in at least one other developing device. An electrostatic recording device characterized by controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12948087A JPS63292172A (en) | 1987-05-25 | 1987-05-25 | Electrostatic recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12948087A JPS63292172A (en) | 1987-05-25 | 1987-05-25 | Electrostatic recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63292172A true JPS63292172A (en) | 1988-11-29 |
Family
ID=15010524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12948087A Pending JPS63292172A (en) | 1987-05-25 | 1987-05-25 | Electrostatic recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63292172A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708917A (en) * | 1995-03-06 | 1998-01-13 | Minolta Co., Ltd. | Toner replenishment device for an image forming apparatus which employs pixel density and toner density information |
| US5724627A (en) * | 1994-11-18 | 1998-03-03 | Minolta Co., Ltd. | Image forming apparatus which calculates toner consumption in accordance with tone correction |
| US5920748A (en) * | 1995-03-06 | 1999-07-06 | Minolta Co., Ltd. | Image forming apparatus capable of estimating toner concentration |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5515185A (en) * | 1978-07-19 | 1980-02-02 | Ricoh Co Ltd | Image density control method |
| JPS6045279A (en) * | 1983-08-22 | 1985-03-11 | Konishiroku Photo Ind Co Ltd | Toner replenishment control method |
| JPS61201277A (en) * | 1985-03-04 | 1986-09-05 | Ricoh Co Ltd | Control method for toner concentration |
| JPS61270774A (en) * | 1985-05-27 | 1986-12-01 | Toshiba Corp | Toner density control device |
| JPS628178A (en) * | 1985-07-04 | 1987-01-16 | Nec Corp | Electrophotographic recording device |
| JPS6243674A (en) * | 1985-08-20 | 1987-02-25 | Sanyo Electric Co Ltd | Electronic copying machine |
-
1987
- 1987-05-25 JP JP12948087A patent/JPS63292172A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5515185A (en) * | 1978-07-19 | 1980-02-02 | Ricoh Co Ltd | Image density control method |
| JPS6045279A (en) * | 1983-08-22 | 1985-03-11 | Konishiroku Photo Ind Co Ltd | Toner replenishment control method |
| JPS61201277A (en) * | 1985-03-04 | 1986-09-05 | Ricoh Co Ltd | Control method for toner concentration |
| JPS61270774A (en) * | 1985-05-27 | 1986-12-01 | Toshiba Corp | Toner density control device |
| JPS628178A (en) * | 1985-07-04 | 1987-01-16 | Nec Corp | Electrophotographic recording device |
| JPS6243674A (en) * | 1985-08-20 | 1987-02-25 | Sanyo Electric Co Ltd | Electronic copying machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5724627A (en) * | 1994-11-18 | 1998-03-03 | Minolta Co., Ltd. | Image forming apparatus which calculates toner consumption in accordance with tone correction |
| US5708917A (en) * | 1995-03-06 | 1998-01-13 | Minolta Co., Ltd. | Toner replenishment device for an image forming apparatus which employs pixel density and toner density information |
| US5920748A (en) * | 1995-03-06 | 1999-07-06 | Minolta Co., Ltd. | Image forming apparatus capable of estimating toner concentration |
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