JP2009163223A5

JP2009163223A5 -

Info

Publication number: JP2009163223A5
Application number: JP2008297099A
Authority: JP
Filing date: 2008-11-20
Publication date: 2012-01-05
Anticipated expiration: 2028-11-20

Description

本発明は、例えば、画像形成装置として実現できる。画像形成装置は、トナー像によって形成される複数のパッチを含むパッチ列を記録材に形成するパッチ形成手段と、記録材に形成されたパッチ列を記録材に定着させる定着手段と、搬送される記録材に定着されたパッチ列の濃度又は色を各パッチごとに検出するパッチ検出手段と、検出された各パッチの濃度又は色に基づいて画像形成条件を補正する補正手段とを備え、パッチ形成手段は、各パッチの搬送方向長がパッチ検出手段により検出される順に徐々に長くなるように、各パッチをパッチ列として形成し、各パッチの搬送方向長は、パッチ検出手段により検出される順に理想位置からのパッチの検出位置変動量が大きくなることに応じて、徐々に長くなっていることを特徴とする。
The present invention can be realized as an image forming apparatus, for example. The image forming apparatus is transported with a patch forming unit that forms a patch row including a plurality of patches formed by a toner image on a recording material, a fixing unit that fixes the patch row formed on the recording material to the recording material, and the like. Patch forming means comprising patch detecting means for detecting the density or color of the patch array fixed to the recording material for each patch, and correcting means for correcting image forming conditions based on the detected density or color of each patch The means forms each patch as a patch row so that the length in the conveyance direction of each patch is gradually increased in the order detected by the patch detection means, and the length in the conveyance direction of each patch is determined in the order detected by the patch detection means. It is characterized in that it gradually becomes longer as the detected position variation amount of the patch from the ideal position becomes larger .

また、本発明は、例えば、画像形成装置の制御方法として実現できる。制御方法は、パッチ形成手段が、トナー像によって形成される複数のパッチを含むパッチ列を記録材に形成するパッチ形成ステップと、定着手段が、記録材に形成されたパッチ列を記録材に定着させる定着ステップと、パッチ検出手段が、搬送される記録材に定着されたパッチ列の濃度又は色を各パッチごとに検出するパッチ検出ステップと、補正手段が、検出された各パッチの濃度又は色に基づいて画像形成条件を補正する補正ステップとを実行し、パッチ形成ステップは、各パッチの搬送方向長がパッチ検出手段により検出される順に徐々に長くなるように、各パッチをパッチ列として形成し、各パッチの搬送方向長は、パッチ検出手段により検出される順に理想位置からのパッチの検出位置変動量が大きくなることに応じて、徐々に長くなっていることを特徴とする。
Further, the present invention can be realized as a control method for an image forming apparatus, for example. Control method, a patch forming means, fixing a patch array including a plurality of patches formed by the toner image and patch formation step of forming on a recording material, fixing means, the patch array formed on the recording material to the recording material A fixing step, a patch detecting unit detects the density or color of the patch row fixed on the recording material to be conveyed for each patch, and a correction unit detects the density or color of each detected patch. A correction step for correcting the image forming condition based on the patch formation step, and the patch forming step forms each patch as a patch row so that the length in the transport direction of each patch gradually increases in the order detected by the patch detection means. However, the length of each patch in the transport direction gradually increases as the amount of change in the detected position of the patch from the ideal position increases in the order detected by the patch detection means. It is characterized in that is.

Claims

Patch forming means for forming a patch row including a plurality of patches formed by a toner image on a recording material;
Fixing means for fixing the patch row formed on the recording material to the recording material;
Patch detection means for detecting, for each patch, the density or color of the patch row fixed on the recording material being conveyed;
Correction means for correcting the image forming condition based on the density or color of each detected patch,
The patch forming means forms each patch as a patch row so that the transport direction length of each patch gradually increases in the order detected by the patch detection means ,
The length in the conveyance direction of each patch is gradually increased in accordance with the amount of change in the detected position of the patch from the ideal position in the order detected by the patch detection unit. .

The transport direction length of each patch is
The spot diameter of the optical sensor used by the patch detection means to detect the density or color of each patch, the distance that the patch moves while the patch detection means detects the density or color, and the recording material of each patch The image forming apparatus according to claim 1, wherein the image forming apparatus includes a toner image shift amount corresponding to the formation position of the toner image.

An environment detecting unit that detects an environment in which the image forming apparatus is installed or an environment in the image forming apparatus and outputs the detected environment information ;
The patch forming means includes
The image forming apparatus according to claim 1, further comprising a changing unit that changes a transport direction length of each patch in accordance with the output environment information.

A counter for counting the number of image forming operations of the image forming apparatus;
The patch forming means includes
4. The image forming apparatus according to claim 1, further comprising a changing unit configured to change a transport direction length of each patch when the number of times reaches a predetermined number. 5.

A discriminating means for discriminating the type of recording material;
The patch forming means includes
4. The image forming apparatus according to claim 1, further comprising a changing unit configured to change a transport direction length of each patch according to the determined type of the recording material.

The patch forming means includes
4. The apparatus according to claim 1, further comprising a changing unit configured to change a conveyance direction length of each patch between the first surface and the second surface of the recording material when patches are formed on both surfaces of the recording material. The image forming apparatus described in the item.

The detected positional variation is variation in the conveyance speed of the recording material, or shrinkage of the recording material when passing through the fixing device, or, that in accordance with the expansion and contraction of the image before forming an image on a recording material The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

Patch forming unit, a patch formation step of forming a patch array including a plurality of patches formed by the toner image to the recording material,
Fixing means comprises a fixing step of fixing the patch array formed on the recording material to the recording material,
Patch detection means, and the patch detection step of detecting the density or color of the patch column fixed on the recording material conveyed for each patch,
A correction unit that performs a correction step of correcting an image forming condition based on the detected density or color of each patch;
The patch forming step forms each patch as a patch row so that the length in the conveyance direction of each patch gradually increases in the order detected by the patch detection means ,
The length in the conveyance direction of each patch is gradually increased in accordance with the amount of change in the detected position of the patch from the ideal position in the order detected by the patch detection unit. Control method.