JPH027472B2 - - Google Patents
Info
- Publication number
- JPH027472B2 JPH027472B2 JP56089444A JP8944481A JPH027472B2 JP H027472 B2 JPH027472 B2 JP H027472B2 JP 56089444 A JP56089444 A JP 56089444A JP 8944481 A JP8944481 A JP 8944481A JP H027472 B2 JPH027472 B2 JP H027472B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic carrier
- carrier
- developing
- photoreceptor
- conductivity
- 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 - Lifetime
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 229920001897 terpolymer Polymers 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
- G03G15/0907—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with bias voltage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、トナーとキヤリアからなる２成分現
像剤を用い、特に画質改善を目的として現像バイ
アスにパルスまたは交流電圧を印加することによ
り、画像濃度を向上させるようにした感光体の静
電潜像を現像する現像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a two-component developer consisting of toner and carrier, and improves image density by applying a pulse or alternating current voltage to the developing bias, particularly for the purpose of improving image quality. The present invention relates to a developing device that develops an electrostatic latent image on a photoreceptor.
従来のこの種の現像装置にあつては、現像バイ
アスにパルス電圧を印加することにより、画像濃
度を向上させることができる一方、このパルス電
圧を高くしすぎたり、パルス幅が広いとキヤリア
より電荷が放出され、これが感光体に転移して画
像を汚すという問題がある。 In conventional developing devices of this type, image density can be improved by applying a pulse voltage to the developing bias. However, if the pulse voltage is too high or the pulse width is wide, the charge is higher than that of the carrier. There is a problem in that this is emitted and transferred to the photoreceptor, staining the image.
本発明は上記した従来技術の欠点を改良するた
めになされたもので、パルス電圧が3.5KVでパル
ス幅が0.3msecになつても感光体への電荷転移が
起こらず、十分きれいな画像を得ることができる
ようにした現像装置を提供しようとするものであ
る。 The present invention has been made to improve the above-mentioned drawbacks of the prior art, and it is possible to obtain a sufficiently clear image without charge transfer to the photoreceptor even when the pulse voltage is 3.5 KV and the pulse width is 0.3 msec. It is an object of the present invention to provide a developing device that can perform the following steps.
以下その構成を図面に示した実施例に基づいて
説明する。 The configuration will be explained below based on the embodiment shown in the drawings.
図中１は小径の導電性の低い磁性キヤリア、２
は大径の導電性が高い磁性キヤリア、３はマグネ
ツトロール、４は現像用スリーブ、５は現像用ス
リーブ４に接続したパルス電源、６は現像バイア
ス電源である。 In the figure, 1 is a small diameter magnetic carrier with low conductivity, 2
3 is a magnetic carrier having a large diameter and high conductivity; 3 is a magnet roll; 4 is a developing sleeve; 5 is a pulse power source connected to the developing sleeve 4; and 6 is a developing bias power source.
上記小径の導電性の低い磁性キヤリア１と大径
の電導性が高い磁性キヤリア２は、マグネツトロ
ール３による磁気吸引力が異なつている。このた
め、現像用スリーブ４によつて搬送されるとき
に、小径の導電性の低い磁性キヤリア１より強く
吸引される大径の導電性が高い磁性キヤリア２
は、小径の導電性の低い磁性キヤリア１よりも現
像用スリーブ４側に移動し、小径の導電性の低い
磁性キヤリア１はその外側に分布するようにな
り、概ね２層状の磁気ブラシを形成し、感光体７
には導電性の低い磁性キヤリア１が接触するよう
になる。そして現像用スリーブ４と感光体７との
間に導電性が高い磁性キヤリア２があるので、現
像用スリーブ４と感光体７との間の電気的な距離
が見掛け上小さくなり、従つて現像電場がより大
きくなり、効率的に現像されるので、全体的に濃
度を濃くすることができる。しかも、背景部が現
像されないように高い現像バイアスを印加して
も、感光体７の側に導電性の低いキヤリア１があ
るため、電荷転移が生じにくく、画像濃度を向上
させつつ十分きれいな画像を得ることができる。 The small-diameter magnetic carrier 1 with low conductivity and the large-diameter magnetic carrier 2 with high conductivity have different magnetic attraction forces due to the magnet roll 3. For this reason, when transported by the developing sleeve 4, the large diameter magnetic carrier 2 with high conductivity is attracted more strongly than the small diameter magnetic carrier 1 with low conductivity.
moves closer to the developing sleeve 4 than the small-diameter, low-conductivity magnetic carrier 1, and the small-diameter, low-conductivity magnetic carrier 1 comes to be distributed on the outside, forming an approximately two-layered magnetic brush. , photoreceptor 7
The magnetic carrier 1, which has low conductivity, comes into contact with. Since there is a highly conductive magnetic carrier 2 between the developing sleeve 4 and the photoreceptor 7, the electrical distance between the developing sleeve 4 and the photoreceptor 7 is apparently small, and the developing electric field is Since the image size becomes larger and is efficiently developed, the overall density can be increased. Moreover, even if a high developing bias is applied so that the background area is not developed, since the carrier 1 with low conductivity exists on the side of the photoreceptor 7, charge transfer is difficult to occur, and a sufficiently clear image can be obtained while improving the image density. Obtainable.
実施例
現像剤を導電性の低い磁性キヤリアと導電性の
高い磁性キヤリアとを２：１の比率になるよう混
合し、トナーを全重量に対して1.5％になるよう
に調合した。Example A developer was prepared by mixing a magnetic carrier with low conductivity and a magnetic carrier with high conductivity in a ratio of 2:1, and the toner was prepared in an amount of 1.5% based on the total weight.
なお上記両キヤリアのうち、前者は直径が
60μ、σ：（10-12／cm）であり、メチルターポ
リマをコートした鉄粉を用い、後者は直径が
100μ、σ：（10-9／cm）の酸化鉄粉を用いた。 Of the above two carriers, the former has a diameter of
60μ, σ: (10 -12 /cm), using iron powder coated with methyl terpolymer, the latter having a diameter of
Iron oxide powder of 100 μ and σ: (10 −9 /cm) was used.
従来の場合、パルス幅が0.1msec、電圧が
2.0KVP―Ｐ以上になると電荷転移が起こり、画
像部の汚れが生じたが、本発明によればパルス幅
が0.3msec、電圧が3.5KVP―Ｐでも電荷転移が
起こらず画像部も十分きれいであつた。 In the conventional case, the pulse width was 0.1 msec and the voltage was
When the voltage exceeds 2.0 KVP-P, charge transfer occurs and the image area becomes smeared, but according to the present invention, even when the pulse width is 0.3 msec and the voltage is 3.5 KVP-P, no charge transfer occurs and the image area is sufficiently clean. It was hot.
本発明は以上のようになり、トナーとキヤリア
からなる２成分現像剤を用い、かつ現像用スリー
ブ４に現像バイアス電圧と共に、パルス電圧を印
加するようにして感光体の静電潜像を現像する現
像装置において、上記キヤリアに、導電性の低い
磁性キヤリアと、この磁性キヤリアより大径で、
かつ導電性が高い磁性キヤリアとを混合して用い
たことにより、パルス電圧が3.5KV、パルス幅が
0.3msecになつても感光体７への電荷転移が起こ
らず、２成分現像剤での画像濃度で向上させつ
つ、十分きれいな画像を得ることができた。 As described above, the present invention develops an electrostatic latent image on a photoreceptor by using a two-component developer consisting of toner and carrier, and applying a pulse voltage together with a developing bias voltage to the developing sleeve 4. In the developing device, the carrier includes a magnetic carrier with low conductivity and a diameter larger than the magnetic carrier,
By mixing it with a highly conductive magnetic carrier, the pulse voltage is 3.5KV and the pulse width is
Even at 0.3 msec, charge transfer to the photoreceptor 7 did not occur, and it was possible to obtain a sufficiently clear image while improving the image density with the two-component developer.
図面は本発明の実施例を示す構成説明図であ
る。
１は導電性の低い磁性キヤリア、２は導電性が
高い磁性キヤリア、３はマグネツトロール、４は
現像用スリーブ、５はパルス電源、６は現像バイ
アス電源。
The drawings are configuration explanatory diagrams showing embodiments of the present invention. 1 is a magnetic carrier with low conductivity, 2 is a magnetic carrier with high conductivity, 3 is a magnet roll, 4 is a developing sleeve, 5 is a pulse power source, and 6 is a developing bias power source.
Claims (1)
い、かつ現像用スリーブ４に現像バイアス電圧と
共に、パルス電圧を印加するようにして感光体の
静電潜像を現像する現像装置において、上記キヤ
リアに、導電性の低い磁性キヤリアと、この磁性
キヤリアより大径で、かつ導電性が高い磁性キヤ
リアとを混合して用いたことを特徴とする現像装
置。1. In a developing device that uses a two-component developer consisting of toner and carrier and applies a developing bias voltage as well as a pulse voltage to the developing sleeve 4 to develop an electrostatic latent image on a photoreceptor, the carrier is A developing device characterized by using a mixture of a magnetic carrier having low conductivity and a magnetic carrier having a larger diameter and higher conductivity than the magnetic carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56089444A JPS57204570A (en) | 1981-06-12 | 1981-06-12 | Developing device of electrophotographic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56089444A JPS57204570A (en) | 1981-06-12 | 1981-06-12 | Developing device of electrophotographic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57204570A JPS57204570A (en) | 1982-12-15 |
| JPH027472B2 true JPH027472B2 (en) | 1990-02-19 |
Family
ID=13970846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56089444A Granted JPS57204570A (en) | 1981-06-12 | 1981-06-12 | Developing device of electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57204570A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0629991B2 (en) * | 1983-04-15 | 1994-04-20 | ミノルタカメラ株式会社 | Magnetic developer for electrophotography |
| JPS6073647A (en) * | 1983-09-30 | 1985-04-25 | Canon Inc | Image forming method |
| JPS60156067A (en) * | 1984-01-26 | 1985-08-16 | Tomoegawa Paper Co Ltd | Composite carrier for electrophotographic developer |
| JPS60159752A (en) * | 1984-01-30 | 1985-08-21 | Minolta Camera Co Ltd | Powder developer for developing electrostatic latent image |
| JPH0827558B2 (en) * | 1985-11-20 | 1996-03-21 | 三洋電機株式会社 | Color development method for electrophotography |
| JPH02130558A (en) * | 1988-11-11 | 1990-05-18 | Tomoegawa Paper Co Ltd | Two-component developer for dry processing for electrophotography |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5555373A (en) * | 1978-10-20 | 1980-04-23 | Ricoh Co Ltd | Pulse bias developing system for magnetic toner |
| JPS5557871A (en) * | 1978-10-20 | 1980-04-30 | Minolta Camera Co Ltd | Developing method with magnetic brush |
| JPS5796353A (en) * | 1980-12-06 | 1982-06-15 | Mita Ind Co Ltd | Two component system developer for magnetic brush development |
-
1981
- 1981-06-12 JP JP56089444A patent/JPS57204570A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5555373A (en) * | 1978-10-20 | 1980-04-23 | Ricoh Co Ltd | Pulse bias developing system for magnetic toner |
| JPS5557871A (en) * | 1978-10-20 | 1980-04-30 | Minolta Camera Co Ltd | Developing method with magnetic brush |
| JPS5796353A (en) * | 1980-12-06 | 1982-06-15 | Mita Ind Co Ltd | Two component system developer for magnetic brush development |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57204570A (en) | 1982-12-15 |
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