JP2014038160A5 - - Google Patents
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- JP2014038160A5 JP2014038160A5 JP2012179569A JP2012179569A JP2014038160A5 JP 2014038160 A5 JP2014038160 A5 JP 2014038160A5 JP 2012179569 A JP2012179569 A JP 2012179569A JP 2012179569 A JP2012179569 A JP 2012179569A JP 2014038160 A5 JP2014038160 A5 JP 2014038160A5
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- voltage
- developer
- image
- carrier
- potential difference
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- 239000000969 carrier Substances 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000005755 formation reaction Methods 0.000 claims 2
- 230000000875 corresponding Effects 0.000 claims 1
- 230000001629 suppression Effects 0.000 claims 1
Description
上記目的を達成するために本発明に係る画像形成装置は、
帯電後、露光されることで静電潜像が形成される像担持体と、
前記像担持体を帯電する帯電手段と、
現像剤を担持し、前記像担持体において前記静電潜像が形成された画像部に現像剤を付着させることで前記静電潜像を現像する現像剤担持体と、
前記現像剤担持体に電圧を印加する電圧印加手段と、
前記電圧が印加されたときに前記像担持体と前記現像剤担持体との間に流れる電流を検知可能な電流検知手段と、
前記帯電手段に前記像担持体を帯電させ、前記電圧印加手段に前記現像剤担持体に対し大きさを徐々に変化させて電圧を印加させることで、帯電後の前記像担持体の表面と電圧印加後の前記現像剤担持体との電位差を徐々に変化させたときの、前記電圧印加手段が印加する印加電圧の大きさの変化に対する前記電流検知手段が検知する検知電流の大きさの変化の比率である、前記検知電流の前記印加電圧に対する傾きの変化に基づいて、現像時における前記電位差が前記像担持体の非画像部に現像剤が付着する現象が抑制される電位差となるように、現像時に前記電圧印加手段が前記現像剤担持体に印加する電圧の大きさを設定する制御手段と、
を備えることを特徴とする画像形成装置。
In order to achieve the above object, an image forming apparatus according to the present invention includes:
An image carrier on which an electrostatic latent image is formed by exposure after charging; and
Charging means for charging the image carrier;
A developer carrying member that carries the developer and develops the electrostatic latent image by attaching the developer to an image portion on which the electrostatic latent image is formed on the image carrier;
Voltage applying means for applying a voltage to the developer carrying member;
Current detection means capable of detecting a current flowing between the image carrier and the developer carrier when the voltage is applied;
By charging the image carrier with the charging unit and applying a voltage with the voltage application unit gradually changing the size with respect to the developer carrier, the surface and voltage of the image carrier after charging are applied. The change in the magnitude of the detected current detected by the current detecting means relative to the change in the magnitude of the applied voltage applied by the voltage applying means when the potential difference with the developer carrier after application is gradually changed. Based on the change in the slope of the detected current with respect to the applied voltage, which is a ratio, the potential difference during development is a potential difference that suppresses the phenomenon that the developer adheres to the non-image portion of the image carrier. Control means for setting the magnitude of the voltage applied to the developer carrier by the voltage application means during development;
An image forming apparatus comprising:
Claims (7)
前記像担持体を帯電する帯電手段と、
現像剤を担持し、前記像担持体において前記静電潜像が形成された画像部に現像剤を付着させることで前記静電潜像を現像する現像剤担持体と、
前記現像剤担持体に電圧を印加する電圧印加手段と、
前記電圧が印加されたときに前記像担持体と前記現像剤担持体との間に流れる電流を検知可能な電流検知手段と、
前記帯電手段に前記像担持体を帯電させ、前記電圧印加手段に前記現像剤担持体に対し大きさを徐々に変化させて電圧を印加させることで、帯電後の前記像担持体の表面と電圧印加後の前記現像剤担持体との電位差を徐々に変化させたときの、前記電圧印加手段が印加する印加電圧の大きさの変化に対する前記電流検知手段が検知する検知電流の大きさの変化の比率である、前記検知電流の前記印加電圧に対する傾きの変化に基づいて、現像時における前記電位差が前記像担持体の非画像部に現像剤が付着する現象が抑制される電位差となるように、現像時に前記電圧印加手段が前記現像剤担持体に印加する電圧の大きさを設定する制御手段と、
を備えることを特徴とする画像形成装置。 An image carrier on which an electrostatic latent image is formed by exposure after charging; and
Charging means for charging the image carrier;
A developer carrying member that carries the developer and develops the electrostatic latent image by attaching the developer to an image portion on which the electrostatic latent image is formed on the image carrier;
Voltage applying means for applying a voltage to the developer carrying member;
Current detection means capable of detecting a current flowing between the image carrier and the developer carrier when the voltage is applied;
By charging the image carrier with the charging unit and applying a voltage with the voltage application unit gradually changing the size with respect to the developer carrier, the surface and voltage of the image carrier after charging are applied. The change in the magnitude of the detected current detected by the current detecting means relative to the change in the magnitude of the applied voltage applied by the voltage applying means when the potential difference with the developer carrier after application is gradually changed. Based on the change in the slope of the detected current with respect to the applied voltage, which is a ratio, the potential difference during development is a potential difference that suppresses the phenomenon that the developer adheres to the non-image portion of the image carrier. Control means for setting the magnitude of the voltage applied to the developer carrier by the voltage application means during development;
An image forming apparatus comprising:
前記電位差が徐々に小さくなるように、前記電圧印加手段が前記現像剤担持体に印加する電圧の大きさを変化させて、前記傾きの変化が、前記電位差が小さくなるほど前記傾きが大きくなる所定の傾向を示すか否かを検知し、
前記傾向を検知したときの電圧の大きさに基づいて、現像時に前記電圧印加手段が前記現像剤担持体に印加する電圧の大きさを設定することを特徴とする請求項１に記載の画像形成装置。 The control means includes
As the potential difference gradually decreases, said voltage application means changing the magnitude of the voltage applied to the developer carrying member, a change in the slope, the potential difference becomes more of a given that the inclination becomes larger smaller Detect whether it shows a trend,
2. The image formation according to claim 1, wherein the voltage application means sets the voltage applied to the developer carrier during development based on a voltage magnitude when the tendency is detected. apparatus.
前記電圧印加手段が前記現像剤担持体に印加する電圧を、前記現象が抑制される前記電位差よりも大きな前記電位差が形成される大きさから前記電位差が徐々に小さくなる大きさに徐々に変化させ、
前記傾きが、前記現象が抑制される電位差となったことを示す所定値以上となったか否
かを検知し、
前記所定値以上となったことを検知した後は、前記電圧印加手段が前記現像剤担持体に印加する電圧をさらに変化させながら、電圧の大きさを変化させたときの少なくとも３つの連続する前記傾きを比較し、前記電位差が小さくなるほど前記傾きが大きくなる傾向を示すか否かを検知することを特徴とする請求項２または３に記載の画像形成装置。 The control means includes
The voltage applied by the voltage application means to the developer carrying member is gradually changed from a size at which the potential difference larger than the potential difference at which the phenomenon is suppressed to a size at which the potential difference is gradually reduced. ,
Detecting whether the slope is equal to or greater than a predetermined value indicating that the phenomenon is a potential difference that suppresses the phenomenon,
After detecting that the voltage is equal to or greater than the predetermined value, the voltage application unit further changes the voltage applied to the developer carrying member, and at least three consecutive times when the magnitude of the voltage is changed. 4. The image forming apparatus according to claim 2, wherein inclinations are compared to detect whether the inclination tends to increase as the potential difference decreases. 5.
前記電流検知手段は、前記像担持体と前記現像剤担持体が離間状態における、前記現像剤担持体、前記現像剤担持体に電気的に接続された部材、前記現像剤担持体に現像剤を介して電気的に接続された部材、にそれぞれ流れる電流の総和を検知可能であることを特徴とする請求項１〜４のいずれか１項に記載の画像形成装置。 The image carrier and the developer carrier are configured to be in contact with and away from each other,
The current detection means includes: the developer carrier, a member electrically connected to the developer carrier, and the developer on the developer carrier when the image carrier and the developer carrier are separated from each other. 5. The image forming apparatus according to claim 1, wherein a sum of currents flowing through members electrically connected to each other can be detected.
前記露光手段は、現像時に前記電圧印加手段が前記現像剤担持体に印加する電圧の大きさに応じて、露光強度を調整することを特徴とする請求項１〜５のいずれか１項に記載の画像形成装置。 Further comprising exposure means for exposing the image carrier,
6. The exposure unit according to claim 1, wherein the exposure unit adjusts an exposure intensity according to a voltage applied by the voltage application unit to the developer carrier during development. Image forming apparatus.
7. The control unit according to claim 1, wherein the control unit performs control to set a magnitude of a voltage that the voltage application unit applies to the developer carrier during development during non-image formation. The image forming apparatus described in 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012179569A JP2014038160A (en) | 2012-08-13 | 2012-08-13 | Image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012179569A JP2014038160A (en) | 2012-08-13 | 2012-08-13 | Image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2014038160A JP2014038160A (en) | 2014-02-27 |
| JP2014038160A5 true JP2014038160A5 (en) | 2015-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012179569A Pending JP2014038160A (en) | 2012-08-13 | 2012-08-13 | Image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2014038160A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7034653B2 (en) * | 2017-09-29 | 2022-03-14 | キヤノン株式会社 | Image forming device |
| JP7309441B2 (en) * | 2019-05-10 | 2023-07-18 | キヤノン株式会社 | image forming device |
| JP7547929B2 (en) | 2020-03-25 | 2024-09-10 | 京セラドキュメントソリューションズ株式会社 | Image forming device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05188709A (en) * | 1992-01-14 | 1993-07-30 | Canon Inc | Image forming device |
| JP2006106057A (en) * | 2004-09-30 | 2006-04-20 | Sharp Corp | Image forming apparatus |
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- 2012-08-13 JP JP2012179569A patent/JP2014038160A/en active Pending
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