JPH023988B2 - - Google Patents
Info
- Publication number
- JPH023988B2 JPH023988B2 JP1285484A JP1285484A JPH023988B2 JP H023988 B2 JPH023988 B2 JP H023988B2 JP 1285484 A JP1285484 A JP 1285484A JP 1285484 A JP1285484 A JP 1285484A JP H023988 B2 JPH023988 B2 JP H023988B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- toner
- developer
- developing
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 14
- 239000000779 smoke Substances 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 2
- 230000001737 promoting effect Effects 0.000 claims 1
- 239000000969 carrier Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007740 vapor deposition Methods 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
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
- G03G15/0928—Details concerning the magnetic brush roller structure, e.g. magnet configuration relating to the shell, e.g. structure, composition
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は電子写真や静電記録などにおける潜像
を可視像とする現像方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a developing method for converting a latent image into a visible image in electrophotography, electrostatic recording, or the like.
電子写真や静電記録などにおいて、記録体に形
成された電気的潜像を現像する現像剤としては、
トナー自身が磁性を帯びている磁性トナーによる
１成分現像剤と、磁性キヤリアと非磁性のトナー
を混合した２正分現像剤などがある。また現像装
置としては、一般には、円筒状の非磁性スリーブ
と非磁性スリーブ内に設けた磁気ロールによる現
像ロールの表面に、前記磁気ロールの磁力で前記
現像剤を吸着し、この現像剤で潜像を有する記録
体表面を摺擦して潜像し可視像（トナー像）とす
るものがある。この現像方法は、現像ロールに吸
着した現像剤層で記録体表面を摺擦するので、現
像剤層の厚さを高精度に規制しないと適正な摺擦
状態が得られず、従つて高濃度の可視像が得られ
ない。また、現像速度をあげようとして現像剤を
高速度で搬送すると摺擦力が過大になつて、トナ
ーが記録体に付着しにくくなつたりあるいは一旦
付着したトナーがかき落されて可視像の濃度が低
下する欠点がある。
In electrophotography, electrostatic recording, etc., the developer that develops the electrical latent image formed on the recording medium is as follows:
There are one-component developers made of magnetic toner in which the toner itself is magnetic, and two-component developers made of a mixture of magnetic carrier and non-magnetic toner. In general, the developing device uses a cylindrical non-magnetic sleeve and a magnetic roll provided in the non-magnetic sleeve to attract the developer to the surface of the developing roll using the magnetic force of the magnetic roll, and the developer is hidden by the developer. There is one that rubs the surface of a recording medium that has an image to form a latent image, which becomes a visible image (toner image). In this developing method, the surface of the recording medium is rubbed with the developer layer adsorbed on the developing roll, so unless the thickness of the developer layer is regulated with high precision, an appropriate rubbing condition cannot be obtained. No visible image can be obtained. Additionally, if the developer is transported at a high speed in an attempt to increase the development speed, the rubbing force becomes excessive, making it difficult for the toner to adhere to the recording medium, or the toner that has once adhered may be scraped off, resulting in the density of the visible image. It has the disadvantage that it decreases.
このような欠点をなくするために１成分現像剤
を用いた現像方法では、特開昭58−95369号公報
に開示されたように、現像ロールから飛翔した磁
性トナーを記録体に作用させて現像する非接触現
像方法が提案されている。 In order to eliminate such drawbacks, in a developing method using a one-component developer, as disclosed in Japanese Patent Laid-Open No. 58-95369, magnetic toner flying from a developing roll acts on a recording medium to develop it. A non-contact developing method has been proposed.
しかしこの非接触現像方法を２成分現像剤を用
いる現像に適用すると、比較的大粒径の磁性キヤ
リアが記録体表面に作用するために光導電性感光
体層を傷付けたり、あるいは潜像に付着している
トナーをかき落してしまい満足する現像特性が得
られないことが分かつた。 However, when this non-contact development method is applied to development using a two-component developer, relatively large particle-sized magnetic carriers act on the surface of the recording medium, causing damage to the photoconductive photoreceptor layer or adhesion to the latent image. It was found that satisfactory developing characteristics could not be obtained due to scraping off of the toner.
また、前記した各現像方法において、潜像に一
旦付着したトナーをかき落す作用は、記録体を複
数回現像してカラーのトナー像を得るカラー現像
においては、前方に位置する現像装置のトナーを
後方に位置する現像装置に混入させて混色を生ず
る欠点をもたらす。 In addition, in each of the above-mentioned developing methods, the action of scraping off the toner once attached to the latent image is the effect of scraping off the toner from the developing device located in front of the developing device in color development, in which a color toner image is obtained by developing the recording medium multiple times. This has the disadvantage that it mixes into the developing device located at the rear, resulting in color mixing.
本発明の目的は、記録体に形成された潜像を、
磁性キヤリアとトナーから成る２成分現像剤を用
いて磁性キヤリアによる悪影響を防止しつつ高濃
度に現像できる現像方法を提供するにある。
The purpose of the present invention is to convert the latent image formed on the recording medium into
It is an object of the present invention to provide a developing method that allows high-density development using a two-component developer consisting of a magnetic carrier and toner while preventing the adverse effects of the magnetic carrier.
本発明は、上記の目的を達成するために、２成
分現像剤を用いた現像方法において、非磁性スリ
ーブ外周に沿つて設けた磁性部材をこの非磁性ス
リーブ内部で回転する磁気ロールの磁力で磁化す
ることによつて非磁性スリーブ外周を搬送される
２成分現像剤を飛翔させ、この現像剤の飛翔時に
磁性キヤリアからトナーを分離してトナーの粉煙
を発生させ、記録体に形成された潜像を前記トナ
ーの粉煙で現像することにより、飛翔する磁性キ
ヤリアによる悪影響を防止しつつトナーによる高
精度を実現することを特徴とする。
In order to achieve the above object, the present invention provides a developing method using a two-component developer in which a magnetic member provided along the outer periphery of a non-magnetic sleeve is magnetized by the magnetic force of a magnetic roll rotating inside the non-magnetic sleeve. By doing this, the two-component developer that is being conveyed around the outer circumference of the non-magnetic sleeve is caused to fly, and when this developer flies, the toner is separated from the magnetic carrier and a toner powder smoke is generated, which removes the latent particles formed on the recording medium. The present invention is characterized in that by developing an image with the toner powder, high precision can be achieved by toner while preventing the adverse effects of flying magnetic carriers.
第１図は本発明方法の適用例を示す２色印刷レ
ーザビームプリンタの概略図である。アルミニウ
ム基体の外周表面にセレン光導電体層を形成した
光導電性記録ドラム１は矢印イ方向に回転する。
そしてこの光導電性記録ドラム１の外周表面は、
帯電器２によつて一様に帯電され、次いで第１の
レーザビーム３で露光されて第１の静電潜像が形
成される。この第１の静電潜像はトナーを付着さ
せたい部分の電荷を消失させたネガが潜像であ
る。第１の現像装置４は黒色トナーと磁性キヤリ
アを混合した第１の２成分現像剤５を内蔵してお
り、この第１の２成分現像剤５を現像ロール６に
吸着して現像剤５の層（磁気ブラシ）を形成し、
後述する非接触現像方法で前記第１の静電潜像を
反転現像（電荷が消失した部分に黒色トナーを付
着させる）して光導電性記録ドラム１の表面に黒
色トナー像を形成する。次に、光導電性記録ドラ
ム１の外周表面の未露光領域は、第２のレーザビ
ーム７で露光されて第２の静電潜像が形成され
る。この第２の静電潜像はネガ潜像、ポジ潜像の
何れでもよく、第２の現像装置８によつて現像さ
れる。第２の現像装置８は赤色トナーと磁性キヤ
リアを混合した第２の２成分現像剤９を内蔵して
おり、この第２の現像剤９を現像ロール１０に吸
着して磁気ブラシを形成し、後述する非接触現像
方法で前記第２の静電潜像を反転現像または正規
現像して光導電性記録ドラム１の表面に赤色トナ
ー像を形成する。このようにして形成された光導
電性記録ドラム１の外周表面の２色のトナー像は
記録紙１１に転写される。転写後に光導電性記録
ドラム１の外周表面に残留する残留トナーはクリ
ーナ１２で除去され、残留電荷はイレーズランプ
１３による一様露光で消去される。
FIG. 1 is a schematic diagram of a two-color printing laser beam printer showing an example of application of the method of the present invention. A photoconductive recording drum 1 having a selenium photoconductor layer formed on the outer peripheral surface of an aluminum base rotates in the direction of arrow A.
The outer peripheral surface of this photoconductive recording drum 1 is
It is uniformly charged by a charger 2 and then exposed to a first laser beam 3 to form a first electrostatic latent image. This first electrostatic latent image is a negative latent image in which the charge in the portion to which toner is to be attached has disappeared. The first developing device 4 has a built-in first two-component developer 5 containing a mixture of black toner and a magnetic carrier. form a layer (magnetic brush),
A black toner image is formed on the surface of the photoconductive recording drum 1 by reversing the first electrostatic latent image (adhering black toner to the portion where the charge has disappeared) using a non-contact developing method to be described later. The unexposed areas of the outer peripheral surface of the photoconductive recording drum 1 are then exposed to a second laser beam 7 to form a second electrostatic latent image. This second electrostatic latent image may be either a negative latent image or a positive latent image, and is developed by the second developing device 8. The second developing device 8 contains a second two-component developer 9 containing a mixture of red toner and a magnetic carrier, and this second developer 9 is attracted to a developing roll 10 to form a magnetic brush. A red toner image is formed on the surface of the photoconductive recording drum 1 by performing reversal development or normal development of the second electrostatic latent image using a non-contact development method to be described later. The two-color toner image thus formed on the outer peripheral surface of the photoconductive recording drum 1 is transferred onto the recording paper 11. The residual toner remaining on the outer peripheral surface of the photoconductive recording drum 1 after the transfer is removed by a cleaner 12, and the residual charge is erased by uniform exposure from an erase lamp 13.
本発明はこのような第１および／または第２の
現像装置４，８に好適な現像方法であり、先ず、
混色の影響が大きい第２の現像装置８の場合を例
にとつて詳述する。 The present invention is a developing method suitable for such first and/or second developing devices 4, 8, and first,
The case of the second developing device 8, which is greatly affected by color mixing, will be described in detail as an example.
第２図は本発明現像方法を実施するための第２
の現像装置８の一例を示す。現像ロール１０は、
アルミニウムのような非磁性材で円筒状に形成さ
れた固定のスリーブ１０ａと、この非磁性スリー
ブ１０ａの内部に軸１０ｂを中心に矢印ロ方向に
回転するように設けられた磁気ロール１０ｃを備
えている。２成分現像剤９は磁性キヤリア９ａと
黒色のトナー９ｂを混合したもので各々相互に摩
擦し合つて逆極性に帯電し、トナー９ｂは磁性キ
ヤリア９ａの周囲に静電力で付着している。磁気
ロール１０ｃは外周表面が周方向に周期的にＮ
極、Ｓ極、Ｎ極……となるように着磁されてお
り、その磁力は前記現像剤９を非磁性スリーブ１
０ａの外周表面に吸着して現像剤９による磁気ブ
ラシを形成する。磁気ロール１０ｃを矢印ロ方向
に回転すると磁気ブラシは非磁性スリーブ１０ａ
の外周表面を反矢印ロ方向に搬送される。ドクタ
ーブレード１４は非磁性スリーブ１０ａの外周表
面を搬送される磁気ブラシの厚さを規制する。光
導電性記録ドラム１と非磁性スリーブ１０ａの近
接領域は現像部で、この現像部の非磁性スリーブ
１０ａの外周表面には軸方向全長に亘つて細長い
板状の磁性部材１５が設けられる。磁性部材１５
は周方向には磁気ロール１０ｃの磁極間隔にほぼ
等しい幅を持ち、磁気ロール１０ｃの磁力で周方
向に磁化される。 FIG. 2 shows a second method for carrying out the developing method of the present invention.
An example of the developing device 8 is shown. The developing roll 10 is
A fixed sleeve 10a formed in a cylindrical shape from a non-magnetic material such as aluminum, and a magnetic roll 10c provided inside the non-magnetic sleeve 10a so as to rotate in the direction of arrow B about an axis 10b. There is. The two-component developer 9 is a mixture of a magnetic carrier 9a and a black toner 9b, which are charged to opposite polarities by friction with each other, and the toner 9b is attached to the periphery of the magnetic carrier 9a by electrostatic force. The magnetic roll 10c has an outer circumferential surface periodically
It is magnetized so that it becomes a pole, an S pole, an N pole, and the magnetic force causes the developer 9 to move towards the non-magnetic sleeve 1.
A magnetic brush is formed by the developer 9 by being attracted to the outer circumferential surface of the developer 0a. When the magnetic roll 10c is rotated in the direction of arrow B, the magnetic brush moves to the non-magnetic sleeve 10a.
The material is conveyed along the outer circumferential surface of the material in the opposite direction of arrow B. The doctor blade 14 regulates the thickness of the magnetic brush conveyed on the outer peripheral surface of the non-magnetic sleeve 10a. A region adjacent to the photoconductive recording drum 1 and the non-magnetic sleeve 10a is a developing section, and an elongated plate-shaped magnetic member 15 is provided on the outer peripheral surface of the non-magnetic sleeve 10a in this developing section over the entire length in the axial direction. Magnetic member 15
has a width approximately equal to the magnetic pole spacing of the magnetic roll 10c in the circumferential direction, and is magnetized in the circumferential direction by the magnetic force of the magnetic roll 10c.
以上の構成において、レーザビームプリンタの
運転時には、光導電性記録ドラム１および磁気ロ
ール１０ｃはそれぞれ矢印イ，ロ方向に回転し、
現像剤９は非磁性スリーブ１０ａの外周表面を矢
印ロと反対向きに搬送される。そして磁性部材１
５の周方向側端部に達した現像剤９はこの側端部
から光導電性記録ドラム１の方向に向つて飛び出
し、磁性部材１５から発生する磁力線φ1に沿つ
て飛翔する。現像剤９が磁性部材１５の側端部か
ら飛翔する現象の発生理由は明らかではないが、
磁性部材１５の側端部に達するまでの現像剤９は
磁気ロール１０ｃの磁力線φ2によつて磁化され
て強く拘束されているのに対し、磁性部材１５の
側端部が磁気ロール１０ｃの回転に従つて交番磁
化されてこの現像剤９に反発磁界を作用させるこ
とによるものと考えられる。 In the above configuration, during operation of the laser beam printer, the photoconductive recording drum 1 and the magnetic roll 10c rotate in the directions of arrows A and B, respectively.
The developer 9 is conveyed along the outer circumferential surface of the non-magnetic sleeve 10a in a direction opposite to the direction of the arrow (b). and magnetic member 1
The developer 9 that has reached the circumferential side edge of the magnetic member 15 flies out from this side edge toward the photoconductive recording drum 1 and flies along the magnetic force line φ 1 generated from the magnetic member 15 . Although the reason for the phenomenon in which the developer 9 flies from the side edge of the magnetic member 15 is not clear,
The developer 9 until it reaches the side end of the magnetic member 15 is magnetized and strongly restrained by the lines of magnetic force φ 2 of the magnetic roll 10c, whereas the side end of the magnetic member 15 is not affected by the rotation of the magnetic roll 10c. This is thought to be due to the fact that the developer 9 is alternately magnetized and a repulsive magnetic field is applied to the developer 9.
現像剤９は飛翔時にトナー９ｂの粉煙を発生す
る。現像剤９が磁気ブラシを形成している状態で
は、磁性キヤリア９ａ同志が磁力で結合して連鎖
状態でありトナー９ｂはこれらの磁性キヤリア９
ａの表面に静電力で付着したり、あるいは複数の
磁性キヤリア９ａ間に機械的に閉じ込められてい
る。しかし飛翔時には磁性キヤリア９ａ相互間の
結合が解かれて分散状態となるので、それまで複
数の磁性キヤリア９ａに共有されたような状態で
付着していたトナー９ａや複数の磁性キヤリア９
ａ間に機械的に閉じ込められていたようなトナー
９ｂが解放されて遊離すること、また分散状態と
なつた磁性キヤリア９ａに付着しているトナー９
ｂには潜像の電界が作用しやすくなり潜像からト
ナー９ａに作用する静電吸引力が大きくなること
などによりトナー９ａが磁性キヤリア９ａから分
離して粉煙が発生すると考えられる。 The developer 9 generates powder smoke of the toner 9b when flying. When the developer 9 forms a magnetic brush, the magnetic carriers 9a are coupled by magnetic force to form a chain, and the toner 9b is attached to these magnetic carriers 9.
It is attached to the surface of the magnetic carrier 9a by electrostatic force, or is mechanically confined between a plurality of magnetic carriers 9a. However, during flight, the bonds between the magnetic carriers 9a are broken and the magnetic carriers 9a become dispersed, so that the toner 9a that had previously been attached to the plurality of magnetic carriers 9a and the plurality of magnetic carriers 9
The toner 9b that was mechanically trapped between the spaces 9a and 9a is released and becomes free, and the toner 9 that is attached to the magnetic carrier 9a that has become dispersed.
It is considered that the electric field of the latent image is more likely to act on the area b, and the electrostatic attraction force acting on the toner 9a from the latent image becomes larger, which causes the toner 9a to separate from the magnetic carrier 9a and generate powder smoke.
現像部において光導電性記録ドラム１の表面は
前記トナー９ｂの粉煙が作用して潜像を現像す
る。ネガ潜像を反転現像する場合には、トナー９
ｂが潜像電荷と同極性の摩擦電荷を帯びるように
磁性キヤリア９ａとトナー９ｂの材質を設定す
る。ポジ潜像を正規現像する場合には、トナー９
ｂが潜像電荷と反対極性に摩擦帯電するように材
質を設定する。 In the developing section, the powder smoke of the toner 9b acts on the surface of the photoconductive recording drum 1 to develop a latent image. When reversing a negative latent image, use toner 9.
The materials of the magnetic carrier 9a and the toner 9b are set so that the magnetic carrier 9a and the toner 9b are charged with a frictional charge having the same polarity as the latent image charge. When regularly developing a positive latent image, toner 9
The material is set so that b is triboelectrically charged to a polarity opposite to that of the latent image charge.
ところで、現像部において現像剤９から発生す
るトナー９ｂの粉煙の濃度は、現像剤９の搬送量
に比例し磁性キヤリア９ａの粒径を小さくし且つ
現像剤中のトナー混合比を増すことによつて高ま
る。磁性キヤリア９ａの粒径としては20〜60μ
ｍ、また混合比は10〜30重量％が望ましい。 By the way, the concentration of the toner powder smoke generated from the developer 9 in the developing section is proportional to the conveyance amount of the developer 9, and it is possible to reduce the particle size of the magnetic carrier 9a and increase the toner mixing ratio in the developer. It rises and rises. The particle size of the magnetic carrier 9a is 20 to 60μ.
m, and the mixing ratio is preferably 10 to 30% by weight.
また磁性部材１５から生じる磁力線φ1に沿つ
て飛翔する現像剤９の飛翔高さは、磁気ロール１
０ｃの回転速度が高くなる程低くなる。従つて光
導電性記録ドラム１の外周表面を非磁性スリーブ
１０ａの外周表面に近ずけて両者間のギヤツプを
狭くし現像性能を高めるには、現像剤９が搬送時
に受ける遠心力で飛翔しない範囲で磁気ロール１
０ｃの回転速度をできるだけ早くする方がよい。 Further, the flying height of the developer 9 flying along the magnetic force line φ 1 generated from the magnetic member 15 is the same as that of the magnetic roll 1.
The higher the rotation speed of 0c, the lower it becomes. Therefore, in order to bring the outer circumferential surface of the photoconductive recording drum 1 close to the outer circumferential surface of the non-magnetic sleeve 10a to narrow the gap between the two and improve the developing performance, it is necessary to prevent the developer 9 from flying away due to the centrifugal force received during conveyance. magnetic roll 1 in range
It is better to make the rotation speed of 0c as fast as possible.
実験によれば、外径寸法が32mmの非磁性スリー
ブ１０ａの外周表面で800ガウスの磁束密度とな
るような８極の磁気ロール１０ｃを用い、厚さ
0.5mm、幅10mmの鋼製の磁性部材１５を設置し、
平均粒径が約30μｍの磁性キヤリア９ａにトナー
９ｂを重量比で25％含有させた現像剤９を用い、
磁気ロール１０ｃを1300rpmで回転させることに
より発生するトナー９ｂの粉煙で、非磁性スリー
ブ１０ａから７mm離れて８cm／ｓの周速で回転す
る光導電性（セレン）記録ドラム１に700Vの表
面電位で形成されたポジ型の潜像を正規現像して
高精度で良好なトナー像が得られた。この現像で
は磁力線φ1に沿つて飛翔する現像剤９（時に磁
性キヤリア９ａ）が潜像面に直接作用しないの
で、潜像に付着したトナーがかき落されることが
なく混色防止効果が得られ、また光導電性記録ド
ラム１の表面損傷防止効果も得られた。 According to experiments, an 8-pole magnetic roll 10c was used so that a magnetic flux density of 800 Gauss was generated on the outer peripheral surface of a non-magnetic sleeve 10a with an outer diameter of 32 mm.
A steel magnetic member 15 with a width of 0.5 mm and a width of 10 mm is installed,
Using a developer 9 in which a magnetic carrier 9a with an average particle size of about 30 μm contains toner 9b at 25% by weight,
The powder smoke of toner 9b generated by rotating the magnetic roll 10c at 1300 rpm creates a surface potential of 700 V on the photoconductive (selenium) recording drum 1 rotating at a circumferential speed of 8 cm/s at a distance of 7 mm from the non-magnetic sleeve 10a. The positive latent image formed by the above process was properly developed, and a high-precision and good toner image was obtained. In this development, the developer 9 (sometimes the magnetic carrier 9a) flying along the magnetic field line φ 1 does not act directly on the latent image surface, so the toner adhering to the latent image is not scraped off and the effect of preventing color mixture is obtained. Moreover, the effect of preventing damage to the surface of the photoconductive recording drum 1 was also obtained.
第３図は本発明方法を実施するための現像装置
の他の例を示す。この例はネガ潜像を反転現像す
るものであるので、例えば第１図に示すレーザビ
ームプリンタの第１の現像装置４に適する。この
場合、第２図に示した現像装置８との相違点は、
非磁性スリーブ６ａ、ドクターブレード１６、磁
性部材１７に直流電源１８と交流電源１９により
正の直流電圧と交流電圧を重畳したバイアス電圧
が印加されていること、光導電性記録ドラム１の
表面に形成された潜像がネガ型で現像装置４は反
転現像するようにトナー５ｂが潜像電荷と同極性
に帯電されていることにある。 FIG. 3 shows another example of a developing device for carrying out the method of the present invention. Since this example performs reversal development of a negative latent image, it is suitable for the first developing device 4 of a laser beam printer shown in FIG. 1, for example. In this case, the difference from the developing device 8 shown in FIG.
A bias voltage in which a positive DC voltage and an AC voltage are superimposed is applied to the non-magnetic sleeve 6a, the doctor blade 16, and the magnetic member 17 by a DC power supply 18 and an AC power supply 19, and a bias voltage formed on the surface of the photoconductive recording drum 1 is applied. The toner 5b is charged to the same polarity as the latent image so that the developed latent image is negative and the developing device 4 performs reversal development.
この現像装置４の直流電源１８の発生電圧を
800V、交流電源１９の発生電圧を800Hzで300V、
その他の条件を前記実施例と同一にして、700V
の表面電位をもつ光導電性記録ドラム１に形成し
たネガ型の潜像を現像することで、良好なトナー
像が得られた。この現像で、直流バイアス電流
は、光導電性記録ドラム１上の正電荷が作る電界
により正電荷をもつトナー５ｂが反発されるのに
打を勝つて該トナー５ｂを潜像に付着させるよう
に作用する。そして交流バイアス電圧は、その振
動電界により磁性キヤリア５ａからトナー５ｂを
分離しやすくしてトナー粉煙濃度を高めて現像効
率を向上させ、またカブリ（背景の汚れ）を減少
させるように作用する。 The voltage generated by the DC power supply 18 of this developing device 4 is
800V, the voltage generated by AC power supply 19 is 300V at 800Hz,
700V with other conditions the same as in the previous example.
A good toner image was obtained by developing a negative latent image formed on the photoconductive recording drum 1 having a surface potential of . In this development, the DC bias current overcomes the repulsion of the positively charged toner 5b by the electric field created by the positive charges on the photoconductive recording drum 1 and causes the toner 5b to adhere to the latent image. act. The alternating current bias voltage acts to facilitate separation of the toner 5b from the magnetic carrier 5a by its oscillating electric field, increase the toner powder smoke concentration, improve the developing efficiency, and reduce fog (background stain).
なおこの現像装置４の構成は、第１図に示した
レーザビームプリンタの第２の現像装置８に適用
することもでき、鮮明な２色のトナー像を得るの
に有効である。 The configuration of this developing device 4 can also be applied to the second developing device 8 of the laser beam printer shown in FIG. 1, and is effective for obtaining clear two-color toner images.
第４図は本発明方法を実施するための現像装置
のさらに他の例を示す。この例は、第３図に示し
た現像装置４の構成に衝突板２０，２１を付加し
たものである。現像剤５は磁性部材１７の側端部
から飛び立ち、先ず、第１の衝突板２０に衝突し
て方向を変えて光導電性記録ドラム１の表面とほ
ぼ平行に進み、次いで第２の衝突板２１に衝突し
て非磁性スリーブ６ａの方向に向きを変え、磁性
部材１７の他方の側端部に戻る。 FIG. 4 shows yet another example of a developing device for carrying out the method of the present invention. In this example, collision plates 20 and 21 are added to the structure of the developing device 4 shown in FIG. The developer 5 flies off from the side edge of the magnetic member 17, first collides with the first collision plate 20, changes direction and travels approximately parallel to the surface of the photoconductive recording drum 1, and then collides with the second collision plate 20. 21, changes direction toward the non-magnetic sleeve 6a, and returns to the other side end of the magnetic member 17.
この現像装置４によれば、現像剤５はバイアス
電界が作用している現像部の空間を飛翔中に衝突
板２０，２１に衝突するのでトナー５ｂは磁性キ
ヤリア５ａからより効果的に分離されて、より高
濃度のトナー粉煙を発生して現像性能を向上す
る。 According to this developing device 4, since the developer 5 collides with the collision plates 20 and 21 while flying through the space of the developing section where the bias electric field is applied, the toner 5b is more effectively separated from the magnetic carrier 5a. , which generates more concentrated toner powder smoke to improve development performance.
第５図は本発明方法を実施するための現像装置
のなおさらに他の例を示す。この例は、第４図に
示した現像装置４の構成において、磁性部材１７
を非磁性スリーブ６ａに固定せずに他の静止部材
に取り付け、非磁性スリーブ６ａを矢印ハ方向に
回転させるようにしたものである。この現像装置
４は磁気ロール６ｃの回転による現像剤搬送力と
非磁性スリーブ６ａによる現像剤搬送が相乗して
現像剤５に作用し、現像剤５の搬送速度が向上す
る。その結果、現像部において磁性部材１７の側
端部から飛翔する現像剤５の量が増えてトナー粉
煙の濃度が増し、結局、現像性能を向上する。実
験結果によれば、第４図に示した現像装置４の場
合には、現像すべき光導電性記録ドラム１の外周
表面の周速度が８cm／ｓでベタ黒部の画像濃度が
1.1のものを15cm／ｓの周速度に増速すると画像
濃度が0.8に低下した。これに対して、第５図の
例では非磁性スリーブ６ａを50rpm回転させるこ
とで15cm／ｓの周速で回転する光導電性記録ドラ
ム１の静電潜像を1.2の濃度に現像できた。 FIG. 5 shows still another example of a developing device for carrying out the method of the invention. In this example, in the configuration of the developing device 4 shown in FIG.
is not fixed to the non-magnetic sleeve 6a, but is attached to another stationary member, and the non-magnetic sleeve 6a is rotated in the direction of arrow C. In this developing device 4, the developer conveying force due to the rotation of the magnetic roll 6c and the developer conveying force by the non-magnetic sleeve 6a work together on the developer 5, and the conveying speed of the developer 5 is increased. As a result, the amount of developer 5 flying from the side end of the magnetic member 17 increases in the developing section, increasing the concentration of toner powder smoke, and ultimately improving the developing performance. According to the experimental results, in the case of the developing device 4 shown in FIG. 4, when the circumferential speed of the outer circumferential surface of the photoconductive recording drum 1 to be developed is 8 cm/s, the image density of the solid black area is
When the peripheral speed of 1.1 was increased to 15 cm/s, the image density decreased to 0.8. On the other hand, in the example shown in FIG. 5, by rotating the non-magnetic sleeve 6a at 50 rpm, the electrostatic latent image on the photoconductive recording drum 1 rotating at a circumferential speed of 15 cm/s could be developed to a density of 1.2.
第６図は現像される記録媒体の移動速度ｖ
（cm／ｓ）と記録媒体に吸着されるトナー量Ｍ
（mg／cm2）の関係を示す特性である。この特性は、
光導電性記録ドラム１に静電潜像を形成する代り
に、８×５cm2のアルミニウム平板を用い、この平
板に−700Vの電圧を印加し、第５図に示した現
像装置４を、非磁性スリーブ６ａと磁性部材１７
を接地して用いたときのものである。非磁性スリ
ーブ６ａの表面とアルミニウム平板との距離（現
像ギヤツプ）を10mm、磁気ロール６ｃの回転速度
を1300rpmに設定した状態で、非磁性スリーブ６
ａの回転速度を0rpmとしたときの現像特性がＡ、
回転速度を50rpmとしたときの現像特性がＢ、回
転速度を100rpmとしたときの現像特性がＣであ
る。なお、磁気ロール６ｃの磁力および磁極数、
非磁性スリーブ６ａの外径寸法、現像剤は第２図
で説明した現像装置と同一である。 Figure 6 shows the moving speed v of the recording medium being developed.
(cm/s) and the amount of toner adsorbed to the recording medium M
(mg/cm 2 ). This characteristic is
Instead of forming an electrostatic latent image on the photoconductive recording drum 1, an 8 x 5 cm 2 aluminum flat plate is used, a voltage of -700 V is applied to this flat plate, and the developing device 4 shown in FIG. Magnetic sleeve 6a and magnetic member 17
This is when used with grounded. With the distance between the surface of the non-magnetic sleeve 6a and the aluminum flat plate (developing gap) set to 10 mm, and the rotation speed of the magnetic roll 6c set to 1300 rpm, the non-magnetic sleeve 6
When the rotation speed of a is 0 rpm, the development characteristics are A,
B is the development characteristic when the rotation speed is 50 rpm, and C is the development characteristic when the rotation speed is 100 rpm. In addition, the magnetic force and number of magnetic poles of the magnetic roll 6c,
The outer diameter of the non-magnetic sleeve 6a and the developer are the same as those of the developing device described in FIG.
この特性から、非磁性スリーブ６ａを回転させ
ることによつてアルミニウム平板へのトナー付着
量が増加し、従つて非磁性スリーブ６ａの回転に
より現像速度を高めることができることが理解で
きよう。 From this characteristic, it can be understood that by rotating the non-magnetic sleeve 6a, the amount of toner adhering to the aluminum plate increases, and therefore, by rotating the non-magnetic sleeve 6a, the developing speed can be increased.
以上に述べた第２図〜第４図の各例における磁
性部材は非磁性スリーブ内に埋め込んだり、スリ
ーブ表面に蒸着などにより堆積させて一体構造と
しても同様効果が得られる。 The magnetic member in each of the examples shown in FIGS. 2 to 4 described above can be embedded in a non-magnetic sleeve, or can be deposited on the sleeve surface by vapor deposition or the like to produce an integral structure with the same effect.
以上のように本発明は、２成分現像剤を用いた
現像方法において、非磁性スリーブ外周に沿つて
設けた磁性部材をこの非磁性スリーブ内部で回転
する磁気ロールの磁力で磁化することによつて非
磁性スリーブ外周を搬送される２成分現像剤を飛
翔させ、この現像剤の飛翔時に磁性キヤリアから
トナーを分離してトナー粉煙を発生させ、記録体
に形成された潜像をこのトナー粉煙で現像するの
で、飛翔する磁性キヤリアによる悪影響を受ける
ことなく高濃度現像を実現できる効果がある。
As described above, the present invention provides a developing method using a two-component developer, in which a magnetic member provided along the outer periphery of a non-magnetic sleeve is magnetized by the magnetic force of a magnetic roll rotating inside the non-magnetic sleeve. The two-component developer that is conveyed around the outer circumference of the non-magnetic sleeve is made to fly, and when this developer flies, the toner is separated from the magnetic carrier to generate toner powder smoke, and the latent image formed on the recording medium is transferred to this toner powder smoke. Since the development is carried out using the same method, high-density development can be achieved without being adversely affected by flying magnetic carriers.
第１図は本発明方法が適用されるレーザビーム
プリンタの概略構成図、第２図〜第５図はその現
像部の縦断側面図、第６図は現像特性図である。
１……光導電性記録ドラム、４……現像装置、
５……２成分現像剤、５ａ，９ａ……磁性キヤリ
ア、５ｂ，９ｂ……トナー、６，１０……現像ロ
ール、６ａ，１０ａ……非磁性スリーブ、６ｃ，
１０ｃ……磁気ロール、１５，１７……磁性部
材。
FIG. 1 is a schematic configuration diagram of a laser beam printer to which the method of the present invention is applied, FIGS. 2 to 5 are longitudinal sectional side views of the developing section thereof, and FIG. 6 is a development characteristic diagram. 1... photoconductive recording drum, 4... developing device,
5... Two-component developer, 5a, 9a... Magnetic carrier, 5b, 9b... Toner, 6, 10... Developing roll, 6a, 10a... Non-magnetic sleeve, 6c,
10c... Magnetic roll, 15, 17... Magnetic member.
Claims (1)
転させ、この非磁性スリーブ外周表面に前記磁気
ロールの磁力で吸着した現像剤の層を少なくとも
前記磁気ロールの回転によつて現像位置まで搬送
し、この現像位置に前記非磁性スリーブ外周に沿
つて設けた磁性部材の一方の側端部から他方の側
端部まで前記現像剤を飛翔させ、記録体に形成さ
れた潜像をこの飛翔する現像剤で現像する現像方
法において、前記現像剤として磁性キヤリアとト
ナーを混合した２成分現像剤を用い、前記現像剤
の飛翔時に磁性キヤリアからトナーを分離してト
ナーの粉煙を発生させ、このトナーの粉煙で前記
潜像を現像することを特徴とする現像方法。 ２ 特許請求の範囲第１項において、前記２成分
現像剤の飛翔通路に衝突部材を設けて飛翔中の２
成分現像剤を衝突させ、この衝突によつて磁性キ
ヤリアらのトナーの分離を促進することを特徴と
する現像方法。 ３ 特許請求の範囲第１項において、前記２成分
現像剤は、粒径20〜60μｍの磁性キヤリアを用
い、トナー混合比は10〜30重量％としたことを特
徴とする現像方法。[Scope of Claims] 1. A magnetic roll is rotated within a cylindrical non-magnetic sleeve, and a layer of developer adsorbed by the magnetic force of the magnetic roll is applied to the outer peripheral surface of the non-magnetic sleeve by at least the rotation of the magnetic roll. A latent image is formed on the recording medium by transporting the developer to a developing position and flying the developer from one side end to the other side end of a magnetic member provided along the outer periphery of the non-magnetic sleeve at this developing position. In this developing method, a two-component developer in which a magnetic carrier and a toner are mixed is used as the developer, and when the developer flies, the toner is separated from the magnetic carrier to generate toner powder smoke. A developing method characterized in that the latent image is developed with the generated toner powder smoke. 2. In claim 1, a collision member is provided in the flight path of the two-component developer to prevent the two-component developer from flying.
A developing method characterized by colliding component developers and promoting separation of toner from a magnetic carrier by the collision. 3. The developing method according to claim 1, wherein the two-component developer uses a magnetic carrier having a particle size of 20 to 60 μm, and the toner mixing ratio is 10 to 30% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1285484A JPS60158473A (en) | 1984-01-28 | 1984-01-28 | Developing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1285484A JPS60158473A (en) | 1984-01-28 | 1984-01-28 | Developing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60158473A JPS60158473A (en) | 1985-08-19 |
| JPH023988B2 true JPH023988B2 (en) | 1990-01-25 |
Family
ID=11816983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1285484A Granted JPS60158473A (en) | 1984-01-28 | 1984-01-28 | Developing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60158473A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0595703A (en) * | 1991-10-04 | 1993-04-20 | Kubota Corp | Working machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06105373B2 (en) * | 1987-09-04 | 1994-12-21 | シャープ株式会社 | Copier developing device |
-
1984
- 1984-01-28 JP JP1285484A patent/JPS60158473A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0595703A (en) * | 1991-10-04 | 1993-04-20 | Kubota Corp | Working machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60158473A (en) | 1985-08-19 |
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