JP2021071536A - 像担持体ユニット、画像形成ユニットおよび画像形成装置 - Google Patents
像担持体ユニット、画像形成ユニットおよび画像形成装置 Download PDFInfo
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Abstract
Description
感光ドラムには、導電性支持体上に電荷発生層と電荷輸送層とを、この順に積層した積層型感光体が一般的に用いられている。電荷発生層と電荷輸送層とを有する積層型感光体の感光層形成の際は、膜強度確保のため、化合物を分散させるためバインダー樹脂が使用される。また、電荷輸送層は、電荷輸送物質と各種バインダー樹脂とを溶剤に溶解、あるいは分散させて得られる塗布液を塗布、乾燥して得るようにしている(例えば、特許文献1参照)。
この問題は感光ドラムの応答特性を良好にする、つまり電荷の移動性を高くすることで、正電荷が蓄積されづらくなり解決する。しかし、その際に残留電位が低くなりすぎると、ベタ画像を印刷した部分から感光ドラムが1周回った際に電位が上がりきらず濃度が濃くなる(以下、「残像」という。) 現象が発生することがあるという問題がある。
ックス株式会社製フロー式粒子像分析装置FPIA−3000を使用した。
なお、Cd×C0は感光ドラムがCd回転したときの(印刷でドットが潜在的に)印刷可能なドット数である。
11 現像ローラ
12 トナー供給ローラ
13 感光ドラム
14 帯電ローラ
15 現像ブレード
16 クリーニングブレード
17 トナー
18 除電光ユニット
20 現像装置
22 トナー収容部
23 ケーシング
25 転写ローラ
26 LEDヘッド
27 定着器
28 画像形成ユニット
35 駆動モータ
55 駆動制御部
71 ドラムギア
72 ドラムフランジ
73 感光層
74 導電性支持体
75 下引き層
76 電荷発生層
77 電荷輸送層
Claims (5)
- 感光層を有する像担持体を有し、
前記像担持体は、絶対値が1000[V]の電圧で印加された帯電部材で帯電され、露光された後、0.06秒経過した表面の電位の絶対値が125[V]以下であり、かつ絶対値が1000[V]の電圧で印加された帯電部材で帯電され、露光された後、0.167秒経過したときの表面の電位の絶対値が55[V]以上であることを特徴とする像担持体ユニット。 - 請求項1に記載の像担持体ユニットにおいて、
更にトナーを有し、
前記帯電部材に印加される電圧は、前記トナーの帯電極性と同じ極性の電圧であることを特徴とする像担持体ユニット。 - 帯電部材と、
表面に現像剤像を担持し、前記帯電部材で表面が帯電され、露光位置で露光部材により露光され、転写位置で前記現像剤像が媒体に転写される像担持体と、
前記像担持体に対向する現像剤担持体と、
を有し、
前記像担持体は、絶対値が1000[V]の電圧が印加された前記帯電部材で帯電されて前記露光位置から前記現像剤担持体との対向位置に到達するまでに表面の電位の絶対値が125[V]以下となり、かつ絶対値が1000[V]の電圧が印加された前記帯電部材で帯電されて前記露光位置から前記転写位置に到達したときの表面の電位の絶対値が55[V]以上であることを特徴とする画像形成ユニット。 - 請求項3に記載の画像形成ユニットにおいて、
更に現像剤としてのトナーを有し、
前記帯電部材に印加される電圧は、前記トナーの帯電極性と同じ極性の電圧であることを特徴とする画像形成ユニット。 - 現像剤像を形成する画像形成装置であって、
請求項3または請求項4に記載の画像形成ユニットを有することを特徴とする画像形成装置。
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Citations (4)
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JP2018004701A (ja) * | 2016-06-27 | 2018-01-11 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、プロセスカートリッジ、及び画像形成装置 |
WO2018061368A1 (ja) * | 2016-09-29 | 2018-04-05 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、プロセスカートリッジ及び画像形成装置 |
JP2018189940A (ja) * | 2017-04-28 | 2018-11-29 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、プロセスカートリッジ及び画像形成装置 |
JP2019078870A (ja) * | 2017-10-24 | 2019-05-23 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、画像形成装置及びプロセスカートリッジ |
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JP2018004701A (ja) * | 2016-06-27 | 2018-01-11 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、プロセスカートリッジ、及び画像形成装置 |
WO2018061368A1 (ja) * | 2016-09-29 | 2018-04-05 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、プロセスカートリッジ及び画像形成装置 |
JP2018189940A (ja) * | 2017-04-28 | 2018-11-29 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、プロセスカートリッジ及び画像形成装置 |
JP2019078870A (ja) * | 2017-10-24 | 2019-05-23 | 京セラドキュメントソリューションズ株式会社 | 電子写真感光体、画像形成装置及びプロセスカートリッジ |
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