JP2018072362A - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
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- JP2018072362A JP2018072362A JP2016207525A JP2016207525A JP2018072362A JP 2018072362 A JP2018072362 A JP 2018072362A JP 2016207525 A JP2016207525 A JP 2016207525A JP 2016207525 A JP2016207525 A JP 2016207525A JP 2018072362 A JP2018072362 A JP 2018072362A
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- Prior art keywords
- image
- photosensitive drum
- image forming
- potential
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Abstract
Description
画像形成ユニット9は、それぞれのトナーを使用して現像剤像としてのトナー像を感光体ドラム1の表面に形成する。
そのため、電荷輸送層30の摩耗特性が良いと長寿命の感光体ドラム1となる。摩耗特性は、電荷輸送層30のマルテンス硬度が低いほど良い傾向がある。
そのため、本実施例の感光体ドラム1が有する電荷輸送層30のマルテンス硬度は130N/mm2以上、170N/mm2以下としている。
スクラッチ試験機は、図5(a)に示すように、感光体ドラム1を水平方向にスライドするホルダー33で固定し、圧子32が感光体ドラム1の表面に垂直に加重するものである。
許容熱移動率 1nm/s
水平方向へのスクラッチ距離 400μm
水平方向へのスクラッチ速さ 20μm/s
初期荷重 0mN
最大到達荷重 4mN
また、スクラッチ残留深さは、荷重が1,9mNに到達した位置に残された傷の深さの値である。この深さの測定方法を説明する。
19[gf/cm]×100×(10−4)[cm]×9.8[mN/gf]=1.88[mN]≒1.9[mN]
となる。
許容熱移動率 1nm/s
最大押込み荷重 4mN
負荷所要時間 25s
荷重保持時間 30s
除荷所要時間 25s
本実施例において、マルテンス硬度は、圧子32を押込み荷重4mNまで押し込んだときの圧子32により形成された押込み深さから算出されたキズの表面積に基づいて導出される値であり、
マルテンス硬度(N/mm2)=試験荷重(押込み荷重)(N)/試験荷重(押込み荷重)下でのビッカース圧子(圧子32)で形成されたキズの表面積(mm2)
で定義される値である。
一方、クリーニングブレードをすり抜ける外添剤の量が多くなると、図9(b)に示すように、ハーフトーンのパターン129の印刷濃度が低下し、ボールド文字128から感光体ドラムの1周期後の部分に残像130が発生する。
しかし、感光体ドラムの摩耗が少なすぎると画像形成ユニット内で発生するオゾンによる感光層劣化が進行し、電気特性を著しく悪化させてしまう。
マルテンス硬度 120〜240MPa(N/mm2)
露光後電位 −30V〜−120V
(前提条件)
スクラッチ残留深さが50〜100nmの範囲であるもの
(印刷試験条件)
印刷速度:A4縦方向26ppm(枚/分)相当
1日の連続印刷枚数:1500枚(この印刷を10日間行い、計15000枚を印刷、印刷モードは1印刷ジョブ当たり3枚の連続印刷とした)
連続印刷時の印刷パターン:印刷領域が0.3%の印刷パターン(未露光部分の面積を大きくすることで正帯電の外添剤が感光体ドラム1の表面に付着しやすい状態にする)
帯電ローラの印加電圧:−1040V
環境:温度24℃、相対湿度50%
このように、マルテンス硬度および露光後電位を変化させた感光体ドラム1で評価実験を行った。
一方、現像バイアス電位差ΔVが140Vより大きい場合、現像ローラとトナー間の反発力が強くなりすぎ、非現像部にもトナーが現像され、紙面の汚れが発生した。
2 帯電ローラ
3 露光LEDヘッド
4 現像ローラ
5 スポンジローラ
6 クリーニングブレード
7 トナーカートリッジ
8 ドラムカーリッジ
9 画像形成ユニット
10 転写ローラ
11 転写ベルト
12 定着装置
13 給紙カセット
14 給紙ローラ
15、17 搬送ローラ
16 レジストローラ
18 排出ローラ
19 排出部
21 現像ブレード
23 除電装置
Claims (4)
- 像担持体と、
前記像担持体の表面を一様に帯電させる帯電部材と、
前記像担持体の表面を露光して静電潜像を形成する露光手段と、
を有し、
前記像担持体表面に対して垂直に押圧する圧子の荷重が1.9mNに到達したときに、前記像担持体表面に残された傷の深さをスクラッチ残留深さとした場合、前記スクラッチ残留深さは、50nm以上、100nm以下であり、
前記像担持体表面のマルテンス硬度が130MPa以上、170MPa以下であり、
前記露光後の像担持体表面の電位が−65V以下、−100V以上であることを特徴とする画像形成装置。 - 請求項1に記載の画像形成装置において、
前記静電潜像を現像剤で現像する現像剤担持体を有し、
前記現像剤担持体に印加する電位と、前記露光後の像担持体の電位との電位差は、60V以上、140V以下であることを特徴とする画像形成装置。 - 請求項1または請求項2に記載の画像形成装置において、
前記マルテンス硬度は、
Agilent Technologies社製微小硬度計Nano Indenter G200を用いて、温度25℃、相対湿度50%の環境下において、対面角145°のプリマウント型バーコビッチ−ダイヤモンド圧子を用いて測定した値であって、
前記圧子を押込み荷重4mNまで押し込んだときの前記圧子により形成された押込み深さから算出されたキズの表面積に基づいて導出され、
マルテンス硬度(N/mm2)=押込み荷重(N)/押込み荷重下での前記圧子で形成されたキズの表面積(mm2)
で定義される値であることを特徴とする画像形成装置。 - 請求項1から請求項3のいずれかに記載の画像形成装置において、
前記帯電部材による前記像担持体の帯電電位は、−500Vである
ことを特徴とする画像形成装置。
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JP2021152607A (ja) * | 2020-03-24 | 2021-09-30 | 沖電気工業株式会社 | 像担持体ユニットおよび画像形成装置 |
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JP2017215427A (ja) * | 2016-05-31 | 2017-12-07 | 株式会社沖データ | ドラム装置、現像装置および画像形成装置 |
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JP2021033211A (ja) * | 2019-08-29 | 2021-03-01 | 株式会社沖データ | 像担持体ユニットおよび画像形成装置 |
JP2021152607A (ja) * | 2020-03-24 | 2021-09-30 | 沖電気工業株式会社 | 像担持体ユニットおよび画像形成装置 |
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