JP2016151758A5 - Image forming apparatus - Google Patents
Image forming apparatus Download PDFInfo
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- JP2016151758A5 JP2016151758A5 JP2015031056A JP2015031056A JP2016151758A5 JP 2016151758 A5 JP2016151758 A5 JP 2016151758A5 JP 2015031056 A JP2015031056 A JP 2015031056A JP 2015031056 A JP2015031056 A JP 2015031056A JP 2016151758 A5 JP2016151758 A5 JP 2016151758A5
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- 230000003287 optical Effects 0.000 claims description 7
- 239000004544 spot-on Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 7
- 230000000875 corresponding Effects 0.000 claims 4
- 230000001678 irradiating Effects 0.000 claims 2
- 238000011144 upstream manufacturing Methods 0.000 claims 1
Description
本発明は、レーザビームを使用して光書き込みを行う画像形成装置に関するものである。
The present invention relates to an image forming equipment which performs optical writing using a laser beam.
本発明の一態様によると、画像形成装置は、感光体と、光源が発する光により前記感光体に光スポットを形成し、当該光スポットを主走査方向に走査することで前記感光体に潜像を形成する走査手段であって、前記感光体を前記光スポットで走査する走査速度は、走査線内において変化する走査手段と、前記主走査方向における第１の像高の走査速度を基準とした場合の第２の像高における走査速度の変化量を検出する検出手段と、前記検出手段によって検出された変化量に基づき、前記光源へ入力される画像信号を補正する補正手段と、を備えることを特徴とする。
According to an aspect of the present invention , the image forming apparatus forms a light spot on the photoconductor by light emitted from the photoconductor and a light source, and scans the light spot in the main scanning direction to thereby form a latent image on the photoconductor. The scanning speed for scanning the photosensitive member with the light spot is based on the scanning speed that changes in the scanning line and the scanning speed of the first image height in the main scanning direction . comprising detecting means for detecting a variation in the scanning speed at the image height the second case, on the basis of the variation amount detected by the previous SL detecting means, and a correcting means for correcting the image signal input to the light source It is characterized by that.
Claims (11)
光源が発する光により前記感光体に光スポットを形成し、当該光スポットを主走査方向に走査することで前記感光体に潜像を形成する走査手段であって、前記感光体を前記光スポットで走査する走査速度は、走査線内において変化する走査手段と、
前記主走査方向における第１の像高の走査速度を基準とした場合の第２の像高における走査速度の変化量を検出する検出手段と、
前記検出手段によって検出された変化量に基づき、前記光源へ入力される画像信号を補正する補正手段と、
を備えることを特徴とする画像形成装置。 A photoreceptor ,
Scanning means for forming a light spot on the photoconductor by light emitted from a light source, and forming a latent image on the photoconductor by scanning the light spot in a main scanning direction. The scanning speed for scanning is a scanning means that changes in the scanning line, and
Detecting means for detecting a change amount of the scanning speed at the second image height when the scanning speed of the first image height in the main scanning direction is used as a reference ;
Based on a change amount detected by the pre-Symbol detection means, and correcting means for correcting the image signal input to the light source,
An image forming apparatus comprising:
前記画像信号における１画素を所定数の画素片で表わした場合に、前記第１の像高よりも走査速度が速い像高では前記１画素を示す所定数の画素片から少なくとも１つの画素片を抜去した走査時間に、前記第１の像高よりも走査速度が遅い像高では前記１画素を示す所定数の画素片へ少なくとも１つの画素片を挿入した走査時間に、合わせるように前記画像信号を補正することを特徴とする請求項１乃至３の何れか１項に記載の画像形成装置。 The correction means includes
When one pixel in the image signal is represented by a predetermined number of pixel pieces, at an image height whose scanning speed is faster than the first image height, at least one pixel piece is selected from the predetermined number of pixel pieces indicating the one pixel. The image signal is adjusted so as to match the scanning time when at least one pixel piece is inserted into a predetermined number of pixel pieces indicating the one pixel at an image height whose scanning speed is slower than the first image height. 4. The image forming apparatus according to claim 1 , wherein the image forming apparatus corrects the image.
前記画素片を抜去する場合に、前記光源へ入力される画像信号の、対応する画素片を無効にすることを特徴とする請求項４に記載の画像形成装置。 The correction means includes
The image forming apparatus according to claim 4 , wherein when the pixel piece is extracted, the corresponding pixel piece of the image signal input to the light source is invalidated.
前記画素片を挿入する場合に、前記光源へ入力される画像信号において、挿入する画素片として、主走査方向に対して上流側の隣接する画素片と同じ画素片を挿入することを特徴とする請求項４又は５に記載の画像形成装置。 The correction means includes
When the pixel piece is inserted, in the image signal input to the light source, the same pixel piece as the adjacent pixel piece on the upstream side with respect to the main scanning direction is inserted as the pixel piece to be inserted. The image forming apparatus according to claim 4 or 5 .
前記検出手段は、前記検出した変化量が、前記記憶手段に記憶された変化情報が示す変化量と異なる場合には、該検出した変化量で前記記憶手段に記憶された変化情報を更新し、
前記補正手段は、前記記憶手段に記憶された前記変化情報が示す変化量に従って、前記光源へ入力される画像信号を補正すること特徴とする請求項１乃至６の何れか１項に記載の画像形成装置。 A storage unit that stores change information indicating a change amount of a scanning speed at the second image height when the image forming apparatus is shipped from a factory when the first image height is used as a reference ;
When the detected change amount is different from the change amount indicated by the change information stored in the storage unit, the detection unit updates the change information stored in the storage unit with the detected change amount,
The image according to any one of claims 1 to 6 , wherein the correction unit corrects an image signal input to the light source according to a change amount indicated by the change information stored in the storage unit. Forming equipment.
現像手段により現像されたトナーマークであって、前記主走査方向に平行な線上において、それぞれが当該線の中心から異なる方向へ所定の間隔だけ離れた位置に形成される２つのトナーマークを検知する２つのセンサと、
前記２つのセンサによって各トナーマークを検出した検出時間に基づいて、前記変化量を算出する算出手段と、
を備えることを特徴とする請求項１乃至７の何れか１項に記載の画像形成装置。 The detection means includes
A Tonama click developed by the developing means, on a line parallel to the front Symbol main scanning direction, detects the two toner marks respectively formed at a position separated by a predetermined distance to a different direction from the center of the line and two of the sensors to be,
Calculation means for calculating the amount of change based on a detection time when each toner mark is detected by the two sensors ;
The image forming apparatus according to any one of claims 1 to 7, characterized in that it comprises.
前記感光体が回転することで前記第１の輪郭線と前記第２の輪郭線とが前記センサの検出位置を通過し、前記センサにより前記第１の輪郭線が検出されたタイミングから前記第２の輪郭線が検出されたタイミングまでの時間差が、前記検出時間として取得されることを特徴とする請求項８に記載の画像形成装置。 The toner mark has a first contour line and a second contour line that is not parallel to the first contour line;
When the photosensitive member rotates, the first contour line and the second contour line pass through the detection position of the sensor, and the second contour is detected from the timing when the sensor detects the first contour line. The image forming apparatus according to claim 8 , wherein a time difference until the timing when the contour line is detected is acquired as the detection time.
前記光源から発した光を偏向する様に構成された偏向器と、
前記偏向器によって偏向された光を前記感光体に照射して前記光スポットを形成する光学系と、
を備えており、
前記検出手段は、
前記光学系の温度を検出するセンサと、
前記センサによって検出された温度から得られる光学系の膨張率に基づいて、前記変化量を算出する算出手段と
を備えることを特徴とする請求項１乃至７の何れか１項に記載の画像形成装置。 The scanning means includes
A deflector configured to deflect light emitted from the light source;
An optical system for forming the light spot by irradiating the photoconductor with light deflected by the deflector;
With
The detection means includes
A sensor for detecting the temperature of the optical system;
Based on the expansion coefficients of the optical system obtained from the detected temperature by the sensor, the image forming according to any one of claims 1 to 7, characterized in that it comprises a calculating means for calculating the amount of change apparatus.
前記光源から発した光を偏向する様に構成された偏向器と、
前記偏向器によって偏向された光を前記感光体に照射して前記光スポットを形成する光学系と、
を備えており、
前記第１の像高は、前記光学系の光軸に対応する軸上像高であることを特徴とする請求項１乃至１０の何れか１項に記載の画像形成装置。 The scanning means includes
A deflector configured to deflect light emitted from the light source;
An optical system for forming the light spot by irradiating the photoconductor with light deflected by the deflector;
With
Said first image height, an image forming apparatus according to any one of claims 1 to 10, wherein the a-axis upper image height corresponding to the optical axis of the optical system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015031056A JP6478693B2 (en) | 2015-02-19 | 2015-02-19 | Image forming apparatus |
| US15/040,448 US9658562B2 (en) | 2015-02-19 | 2016-02-10 | Image forming apparatus and optical scanning apparatus for scanning photosensitive member with light spot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015031056A JP6478693B2 (en) | 2015-02-19 | 2015-02-19 | Image forming apparatus |
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| Publication Number | Publication Date |
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| JP2016151758A JP2016151758A (en) | 2016-08-22 |
| JP2016151758A5 true JP2016151758A5 (en) | 2018-03-22 |
| JP6478693B2 JP6478693B2 (en) | 2019-03-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6818593B2 (en) * | 2017-02-28 | 2021-01-20 | キヤノン株式会社 | Image forming device |
| JP6429944B1 (en) * | 2017-05-30 | 2018-11-28 | キヤノン株式会社 | Optical scanning device and image forming apparatus having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0573622U (en) * | 1991-08-27 | 1993-10-08 | 横河メディカルシステム株式会社 | Laser printer |
| JP2001208990A (en) * | 1999-11-19 | 2001-08-03 | Fuji Xerox Co Ltd | Image forming device |
| JP2001201702A (en) * | 2000-01-20 | 2001-07-27 | Nec Niigata Ltd | Laser scanning optical device and laser scanning method |
| JP3797218B2 (en) * | 2001-12-28 | 2006-07-12 | コニカミノルタホールディングス株式会社 | Color image forming apparatus |
| DE10250827B3 (en) * | 2002-10-31 | 2004-07-15 | OCé PRINTING SYSTEMS GMBH | Imaging optimization control device for electrographic process providing temperature compensation for photosensitive layer and exposure light source |
| JP2004230722A (en) * | 2003-01-30 | 2004-08-19 | Sharp Corp | Image forming device |
| JP4355549B2 (en) * | 2003-09-26 | 2009-11-04 | キヤノン株式会社 | Image forming apparatus and scanning position correcting method |
| WO2006129606A1 (en) * | 2005-05-31 | 2006-12-07 | Naltec Inc. | Image formation method and device |
| JP2007226138A (en) * | 2006-02-27 | 2007-09-06 | Canon Inc | Laser scanner apparatus |
| JP5554941B2 (en) * | 2009-05-22 | 2014-07-23 | キヤノン株式会社 | Image forming apparatus and main scanning magnification correction method thereof |
| JP5407880B2 (en) * | 2010-01-13 | 2014-02-05 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP5578328B2 (en) * | 2011-05-31 | 2014-08-27 | コニカミノルタ株式会社 | Image reading device |
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