JPS5915272A - Picture formation device - Google Patents
Picture formation deviceInfo
- Publication number
- JPS5915272A JPS5915272A JP12476782A JP12476782A JPS5915272A JP S5915272 A JPS5915272 A JP S5915272A JP 12476782 A JP12476782 A JP 12476782A JP 12476782 A JP12476782 A JP 12476782A JP S5915272 A JPS5915272 A JP S5915272A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- corona
- potential
- image
- latent image
- 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
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
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/169—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer with means for preconditioning the toner image before the transfer
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は画像形成装置に係り、転写方式において、形成
画像濃度の変化にかかわらず安定した転写画像を得るこ
とを可能とする画像形成装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus capable of obtaining a stable transferred image regardless of changes in formed image density in a transfer method.
従来感光体、絶縁ドラム等の像担持体を用いて原稿に対
応したｉｉ！ｉｉ像を形成する画像形成装置においては
、ドラム状又はベルト状等に形成された像担持体上に、
原稿に対応した現像像を所定のプロセスを経て形成し、
これを転与材に転写して最終コピーを得ることが一般に
行われている。この時、画像の転写方式として、像担持
体上の現像像を構成するトナー電荷とは逆極性のコロナ
放電を転写材の背面に施し、静電吸引力によりトナーを
転写材に吸着させる。次いで、逆極性コロナ或いはＡＣ
、コロナを施して転写材を像担持体から分離するものが
知られている。ii! Conventionally, image carriers such as photoreceptors and insulated drums were used to handle originals. In an image forming apparatus that forms an image, on an image bearing member formed in the shape of a drum or belt,
A developed image corresponding to the original is formed through a predetermined process,
It is common practice to transfer this onto a transfer material to obtain a final copy. At this time, as an image transfer method, a corona discharge having a polarity opposite to that of the toner charge constituting the developed image on the image carrier is applied to the back surface of the transfer material, and the toner is attracted to the transfer material by electrostatic attraction. Then reverse polarity corona or AC
It is known that the transfer material is separated from the image carrier by applying corona.
第１図はこの様な従来例画像形成装置の概略図ハＰＨ’
ｌ” ）で被覆したものを用いている。Figure 1 is a schematic diagram of such a conventional image forming apparatus.
1") is used.
２は１次コロナ放電器で、感光体の光導電材料の極性←
）と逆極性（ト）のコロナ放電を発生する。ろはＡＣ（
或いは１次と逆極性成分の）コロナ放電器、４は像露光
、５は全面露光ランプであり、これらにより潜像が形成
されろ。６は現像器、７は給紙ガイド、８は転写コロナ
放電器、９は分離コロナ放電器、１０は転写紙、１１は
分離された転写紙１０の搬送手段、１２は感光体ドラム
１のクリーニング手段、１６は現像像である。2 is the primary corona discharger, and the polarity of the photoconductive material of the photoreceptor ←
) and generates a corona discharge of opposite polarity (g). Roha AC (
A latent image is formed by a corona discharger (or a component of polarity opposite to the primary); 4 is an image exposure lamp; and 5 is a full-surface exposure lamp. 6 is a developing device, 7 is a paper feed guide, 8 is a transfer corona discharger, 9 is a separation corona discharger, 10 is a transfer paper, 11 is a conveyance means for the separated transfer paper 10, and 12 is a cleaning device for the photosensitive drum 1. Means 16 is a developed image.
この様な静電転写分離方式は、転写紙１０の背面電荷の
中和による吸着力減少と転写紙１０自身の物性（重さ２
弾性等）の−くランスにより実現されろ。吸着力の減少
は分離コロナで行われるが分離コロナ放電器の適正値は
ドラム表面電位によって変動する。分離コロナの放電状
態が一定の場合性を合わせると、文字原稿の様な白地の
多い（電位の小さい）原稿をコピーするときに、転写材
を分離し難くジャムを起こす場合がある。そこで文字原
稿に合わせて分離コロナの条件を変えると、写真原稿等
は転写率が減少して画像濃度が低下したり又ベタ部が白
く抜ける転写部は現象を生ずる。Such an electrostatic transfer separation method reduces the adsorption force by neutralizing the charge on the back side of the transfer paper 10 and reduces the physical properties of the transfer paper 10 itself (weight 2
This can be achieved through the reduction of elasticity, etc.). The adsorption force is reduced by a separate corona, but the appropriate value for the separate corona discharger varies depending on the drum surface potential. If the discharge state of the separated corona is constant, when copying a document with a lot of white background (low potential) such as a character document, it may be difficult to separate the transfer material and jam may occur. Therefore, if the conditions of the separated corona are changed according to the text document, the transfer rate will decrease in the case of a photographic document, resulting in a decrease in image density, and a phenomenon will occur in the transfer area where the solid area becomes white.
上述の欠点を解消するためには、分離時のドラム表面電
位を均一化出来れば理論的には解消できる。そこで均一
化のために提案されたのが、第２図に示す様な現像部と
転写部との間に画像電位と同極性のコロナ或いはＡＣコ
ロナを放電するコロナ放電器（以後前転写コロナ放雷、
器と称す）を用いることであった。しかし画像電位（Ｖ
［ｌ）と非画像電位〔■りとの差は縮まるが均一電位に
は成り難い。Theoretically, the above-mentioned drawbacks can be solved if the drum surface potential during separation can be made uniform. Therefore, in order to achieve uniformity, a corona discharger (hereinafter referred to as a "pre-transfer corona discharger") was proposed that discharges a corona of the same polarity as the image potential or an AC corona between the developing section and the transfer section as shown in Figure 2. Thunder,
(referred to as a vessel). However, the image potential (V
Although the difference between [l] and the non-image potential [■] is reduced, it is difficult to achieve a uniform potential.
更に強くすることにより、非画像電位は画像電位の極性
と逆極性側に大きくシフトした電位となる。By making it even stronger, the non-image potential becomes a potential that is largely shifted to the opposite polarity side to the polarity of the image potential.
（表面が絶縁性のため正負両極性に帯電する。）そのた
め感光体内部に感光体の感光タイプ〔Ｎ型半導体〕と逆
電界が生じ感光体の劣化を促進させるという弊害がある
。(Since the surface is insulating, it is charged with both positive and negative polarities.) Therefore, an electric field opposite to that of the photosensitive type (N-type semiconductor) of the photoconductor is generated inside the photoconductor, which has the disadvantage of accelerating deterioration of the photoconductor.
本発明は、上述の点に鑑み成されたもので、感光体の劣
化を防止しつつ良好な転写を可能とする画像形成装置に
関する。The present invention has been made in view of the above-mentioned points, and relates to an image forming apparatus that enables good transfer while preventing deterioration of a photoreceptor.
以下、本発明の詳細を具体例により図面を参照しつつ説
明する。Hereinafter, details of the present invention will be explained using specific examples with reference to the drawings.
第６図は、本発明に基づく具体例画像形成装置の側面図
である。尚、第１，２図示装置と共通部材は同一番号で
示す。FIG. 6 is a side view of a specific example image forming apparatus based on the present invention. Incidentally, parts common to the first and second illustrated devices are indicated by the same numbers.
前述従来装置と異なる点は、以下の諸手段を設けた点で
ある。The difference from the conventional device described above is that the following means are provided.
１５は電位検知センサー、１６は増巾回路である。15 is a potential detection sensor, and 16 is an amplification circuit.
これ等は電位検知手段を構成する。１７は演算回路を含
む制御手段である。１８は転写前帯電手段用の高圧電源
で、前記制御手段により出力電圧が制御される。These constitute potential detection means. 17 is a control means including an arithmetic circuit. Reference numeral 18 denotes a high voltage power source for a pre-transfer charging means, the output voltage of which is controlled by the control means.
尚、１９は前除電用コロナ放電器、２０は前露光ランプ
である。In addition, 19 is a corona discharger for pre-static elimination, and 20 is a pre-exposure lamp.
以下、同図示装置の動作を説明する。The operation of the illustrated device will be explained below.
先ず前露光手段２０で露光を感）ＹＳ体に施す。First, the pre-exposure means 20 exposes the YS body.
−１−７，ＯＫＶを１次コロナ放電器２に印加し、感光
体表面を一様に帯電する。１次子電々位は約＋１５００
〜２０００Ｖ程度である。次いで感光体表面に原稿光像
露光を施１７つつ、−３，ＱＫＶを印加した２次コロナ
放電器６でコロナ除電を行う。次いで螢光燈（’ ２０
Ｗ ）を用いた全面露光源により感光体表面を一様照
射して静電潜像形成が完了する。潜像電位としては原稿
光像露光の当たらない非照射部は約＋５００ （Ｖ）、
原稿の白地部即ち光の当った照射部で約０（ト）である
。-1-7, OKV is applied to the primary corona discharger 2 to uniformly charge the surface of the photoreceptor. The primary electron potential is approximately +1500
~2000V. Next, while exposing the surface of the photoreceptor to an original light image 17, corona charge removal is performed using a secondary corona discharger 6 to which -3,QKV is applied. Then the fluorescent light ('20
The surface of the photoreceptor is uniformly irradiated with a full-surface exposure source using W) to complete the formation of an electrostatic latent image. The latent image potential is approximately +500 (V) in the non-irradiated area where the original light image is not exposed.
It is approximately 0 (g) in the white background part of the original, that is, the irradiated part where the light hits.
この様に形成された静電潜像をジャンピング現像により
顕画像化する。そして顕画像に転写材を重ね、上記転写
コロナ放電器７で転写コロナを施す。The electrostatic latent image thus formed is visualized by jumping development. Then, a transfer material is superimposed on the visible image, and a transfer corona is applied by the transfer corona discharger 7.
その後転写紙背面電荷を分離コロナ放電器９で除電し、
分離して図示しない定着器で定着しコピーを供する。一
方転写終了後の感光体表面残留トナーはクリーニング手
段１２で除去される。After that, the charge on the back of the transfer paper is removed by a separate corona discharger 9,
The image is separated and fixed in a fixing device (not shown) to provide a copy. On the other hand, toner remaining on the surface of the photoreceptor after the transfer is completed is removed by cleaning means 12.
上述プロセスの途中で感光ドラムーヒに形成された表面
電位は順次電位検知センサー１５で検知される。検知さ
れた検知信号は増ｒ９器１６で増巾され、更に制御手段
１７の演算制御回路へと送られる。The surface potential formed on the photosensitive drum during the above process is sequentially detected by the potential detection sensor 15. The detected detection signal is amplified by the amplifier 16 and further sent to the arithmetic control circuit of the control means 17.
演算制御回路ではその検出信号に合わせて、前転写コロ
ナの強さを算出する。そしてとの側斜、に基づく制御信
号を前転写コロナの高圧電源１８へ送る。高圧電源１８
では送られた信号によって前転写コロナ放電、器に適正
値を印加する。この時検知されたドラム上電位部が前転
写コロナ部にきてから適正値が印加される様、検知位置
からコロナ作用位置迄のＭ適時間に応じた遅延時間をセ
ットしていることは勿論である。前転写コロナは感光体
ドラム表面電位に応じてその強さが制御される。The arithmetic control circuit calculates the strength of the pre-transfer corona according to the detection signal. Then, a control signal based on the side inclination of and is sent to the high voltage power supply 18 of the pre-transfer corona. High voltage power supply 18
Then, the appropriate value is applied to the pre-transfer corona discharge vessel according to the sent signal. Of course, a delay time is set in accordance with the M appropriate time from the detection position to the corona action position so that an appropriate value is applied after the detected drum top potential area reaches the pre-transfer corona area. It is. The strength of the pre-transfer corona is controlled depending on the surface potential of the photoreceptor drum.
この様に制御することで画像電位ＶｏＯ所は強く、非画
像部は弱くすることにより分離部に達するときの感光体
ドラム表面電位は略均−と出来た。By controlling in this way, the image potential VoO is strong, and the non-image area is made weak, so that the surface potential of the photosensitive drum when it reaches the separation area can be made approximately equal.
この時分子ｓは白ペタ原稿のもの黒ベタ原稿のもの両者
ともに良好な分離を示した。又黒ベタのものも再転写を
生じなかった。At this time, the molecule s showed good separation in both the white flat original and the black solid original. Also, no retransfer occurred with solid black.
又普通の一般文書を複写したところ、転写率が良好でか
つ文字のシャープネスにも優れた画像が得られた。Furthermore, when an ordinary document was copied, an image with a good transfer rate and excellent character sharpness was obtained.
上記例では、通常の複写動作中に、前転写コロナ制御を
同時に行うものであるが、これに限らず以下の如くして
も良い、、複写工程に先立ち制御工程を行う方式で、通
常複写工程の前に空スキャンを行い、原稿に応じた潜像
の電位を読みとり演η。In the above example, the pre-transfer corona control is performed simultaneously during the normal copying operation, but the method is not limited to this, and the following methods may also be used. Before scanning, perform a blank scan and read the potential of the latent image according to the original.
制御し、前転写コロナの適正値を決めそれから通常複写
動作を行う方式である。（通常複写動作中には、前転写
コロナは設定された一定のコロナである。）
この方式の具体例動作ステップは以下の通りである。This method determines an appropriate value for the pre-transfer corona and then performs normal copying operations. (During normal copying operations, the pre-transfer corona is a set constant corona.) The exemplary operating steps for this system are as follows.
（１）空スキャンを行い、原稿に基づく潜像の電位を検
知する。(1) Perform a blank scan and detect the potential of the latent image based on the original.
（２）潜像電位を積分し、その積分値によって前転写コ
ロナの適正値を求め、前転写コロナを適正値にセットす
る。尚、積分値が大きい程ベタ黒部等画像部が多いので
前転写コロナを強くし、攪分値が小さい程弱くする。勿
論前述例でも積分値を用いる場合同様な設定である。(2) Integrate the latent image potential, determine the appropriate value of the pre-transfer corona from the integrated value, and set the pre-transfer corona to the appropriate value. Note that the larger the integral value is, the more image areas such as solid black areas are present, so the pre-transfer corona is made stronger, and the smaller the agitation value is, the weaker it is. Of course, the settings are similar in the case of using the integral value in the example described above.
（ろ）通常コピー中に制御後の適正前転写コロナを与え
る。(b) Appropriate pre-transfer corona after control is provided during normal copying.
更に異なる制御例としては、原稿に応じた潜像の全域に
ついて電位検知をぜずに、その一部の」１］定に基づき
前転写コロナ放電器への印加電圧を制御するものである
。A further different control example is to control the voltage applied to the pre-transfer corona discharger based on the value of a portion of the latent image without detecting the potential of the entire area of the latent image depending on the document.
例えば、原稿に応じて感光体ドラノ・上に形成される潜
像の先端部分が電位センザー位置を通過し、前転写コロ
ナ放電器位置に到達する間の電位を検知積分し、この値
に基づき前転写コロナ放電器の印加電圧を設定するもの
である。For example, the potential is detected and integrated while the leading edge of the latent image formed on the photoconductor drano passes the potential sensor position and reaches the pre-transfer corona discharger position depending on the original, and based on this value the potential is detected and integrated. This is to set the applied voltage of the transfer corona discharger.
以−ヒ、具体例により詳述した如く、本発明は像担持体
上に形成したｍ像を現像・転写する画像形成装置におい
て、像担持体上に形成した潜像電位を検知する手段と、
転写に先立って像担持体表面にコロナ放電を施す転写前
コロナ放電手段と、前記潜像電位検知手段の検知信号に
基づき、前記転写前コロナ放電手段の印加電圧を制御す
る手段とを有することを特徴とする。As described in detail with specific examples below, the present invention provides an image forming apparatus that develops and transfers an m-image formed on an image bearing member, and includes means for detecting the latent image potential formed on the image bearing member;
A pre-transfer corona discharge means for applying a corona discharge to the surface of the image carrier prior to transfer, and a means for controlling the voltage applied to the pre-transfer corona discharge means based on a detection signal from the latent image potential detection means. Features.
本発明は、原稿の種類によらず、安定した転写画像を得
ることを６Ｊ能とする。The present invention makes it possible to obtain a stable transferred image regardless of the type of original.
又、転写前コロナを有効に利用出来るので、フィックス
効果が十分でシャープネスの高い画像を得ることができ
る。Furthermore, since the pre-transfer corona can be used effectively, an image with sufficient fixing effect and high sharpness can be obtained.
又、静電分離を利用する際に転写材の分離性が一定とな
り、ジャムの恐れも除かれる。Furthermore, when electrostatic separation is used, the separation of the transfer material becomes constant and the fear of jamming is eliminated.
第１図及び第２図は従来例画像形成装置を説明する側面
図、
第３図は本発明に基づく具体例画像形成装置の側面図。
図中、１；像担持体、２：１次コロナ放電器、３；ＡＣ
コロナ放電器、４；像露光、１５；電イ）ン検知センザ
ー、１６：増ｒｊＪ回路、１７；制御手段。
臼逅６1 and 2 are side views illustrating a conventional image forming apparatus, and FIG. 3 is a side view of a specific example image forming apparatus based on the present invention. In the figure, 1: image carrier, 2: primary corona discharger, 3: AC
Corona discharger, 4; Image exposure, 15; Electron detection sensor, 16: Amplifier rjJ circuit, 17; Control means. 6
Claims (1)
像形成装置において、 像担持体上に形成した潜像電位を検知する手段と、 転写に先立って像相持体表面にコロナ放電を施す転写前
コロナ放電手段と、 前記潜像電位検知手段の検知信号に基づき、前記転写前
コロナ放電手段の印加電圧を制御する手段とを有するこ
とを特徴とする画像形成装置。 （２、特許請求の範囲第１項記載の発明において、前記
潜像電位検知手段は、潜像電位の積分値を検出し、前記
印加電圧制御手段は、検出積分値の増大に応じて印加電
圧を増大することを特徴とする画像形成装置。(1) In an image forming apparatus that develops and transfers a latent image formed on an image carrier, there is a means for detecting the potential of the latent image formed on the image carrier, and a corona discharge on the surface of the image carrier prior to transfer. An image forming apparatus comprising: a pre-transfer corona discharge means for performing the following; and a means for controlling a voltage applied to the pre-transfer corona discharge means based on a detection signal from the latent image potential detection means. (2. In the invention set forth in claim 1, the latent image potential detection means detects an integral value of the latent image potential, and the applied voltage control means applies the applied voltage according to an increase in the detected integral value. An image forming apparatus characterized by increasing the number of images.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12476782A JPS5915272A (en) | 1982-07-17 | 1982-07-17 | Picture formation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12476782A JPS5915272A (en) | 1982-07-17 | 1982-07-17 | Picture formation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5915272A true JPS5915272A (en) | 1984-01-26 |
| JPH0423788B2 JPH0423788B2 (en) | 1992-04-23 |
Family
ID=14893609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12476782A Granted JPS5915272A (en) | 1982-07-17 | 1982-07-17 | Picture formation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5915272A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5296903A (en) * | 1991-10-18 | 1994-03-22 | Canon Kabushiki Kaisha | Image forming apparatus having control based on detected toner charge and transfer efficiency |
| KR100423009B1 (en) * | 1996-12-28 | 2005-04-13 | 삼성전자주식회사 | Image forming method of electrophotographic developing apparatus |
| US20100008687A1 (en) * | 2008-07-09 | 2010-01-14 | Hirokazu Ishii | Image forming apparatus |
-
1982
- 1982-07-17 JP JP12476782A patent/JPS5915272A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5296903A (en) * | 1991-10-18 | 1994-03-22 | Canon Kabushiki Kaisha | Image forming apparatus having control based on detected toner charge and transfer efficiency |
| KR100423009B1 (en) * | 1996-12-28 | 2005-04-13 | 삼성전자주식회사 | Image forming method of electrophotographic developing apparatus |
| US20100008687A1 (en) * | 2008-07-09 | 2010-01-14 | Hirokazu Ishii | Image forming apparatus |
| US8290411B2 (en) * | 2008-07-09 | 2012-10-16 | Ricoh Company, Limited | Image forming apparatus having a pre-transfer neutralizing device to reduce an electric potential to facilitate separation |
| US8396386B2 (en) | 2008-07-09 | 2013-03-12 | Ricoh Company, Limited | Image forming apparatus which controls a transfer bias to a leading edge of a recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0423788B2 (en) | 1992-04-23 |
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