IMAGE FORMING APPARATUS AND IMAGE READING DEVICE

• Main Author: HAMADA SHUHEI
• Format: Patent
• Language: English; Japanese
• Published: 25.11.2021
• Subjects: CINEMATOGRAPHY; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; MAGNETOGRAPHY; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

To provide a technique to accurately read density patches while reducing the influence of flare.SOLUTION: An image forming apparatus comprises: image forming means that forms, on a sheet, density patches each including a plurality of images with different densities; conveying means that conveys the sheet in a first direction; reading means that reads a surface of the sheet on which the density patches are formed and conveyed by the conveying means to output read data; detection means that, based on the read data, detects the amount of skew of the density patches with respect to the first direction; and determination means that, based on the skew amount, for each of the plurality of images of the density patches, determines data, in the read data, which corresponds to a predetermined area of the image used for determining the density of the image.SELECTED DRAWING: Figure 9 【課題】フレアの影響を抑えて精度良く濃度パッチを読み取る技術を提供する。【解決手段】画像形成装置は、画像形成装置は、異なる濃度の複数の画像を含む濃度パッチをシートに形成する画像形成手段と、前記シートを第１方向に搬送する搬送手段と、前記濃度パッチが形成され前記搬送手段により搬送されている前記シートの表面を読み取って読取データを出力する読取手段と、前記読取データに基づき、前記濃度パッチの前記第１方向に対する斜行量を検出する検出手段と、前記斜行量に基づき、前記濃度パッチの前記複数の画像それぞれについて、前記読取データの内、画像の濃度を判定するために使用する前記画像の所定領域に対応するデータを判定する判定手段と、を備えている。【選択図】図９