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JPH113019A Expired / Lapsed JP ⏱️ 0.0 years remaining

Image detection device and image forming device

Assignee: Fujifilm Business Innovation Corp
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Filing: 1997-06-10
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Granted: —
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Expires: 2017-06-10
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Abstract

Abstract Translated from Japanese (57)【要約】 【課題】 画像濃度と色ずれの検出を安価で且つ高精度 に実現する。 【解決手段】 図7(A)に示すように、正反射光量L 1と拡散光量L2とが等しくなる時点が、照射領域の中 心が画像の境界線分上に到達した時点に対応するよう に、即ち、光量差Δ1=光量差Δ2となるように、予め 第1受光部及び第2受光部による光量検出レベルを調整 しておく。これにより、正反射光量L1と拡散光量L2 とが等しくなった時点を検出することで、照射領域の中 心が境界線分上に到達した時間を検出できる。この到達 時間のずれに基づいて、画像の色ずれを検出することが できる。また、画像の濃度が高くなるにつれて、正反射 光量L1は減少し拡散光量L2は増加するという特性に 基づいて、該画像の濃度に対応する値として、上記正反 射光量L1と拡散光量L2との比率を算出する。 (57) [Summary] [PROBLEMS] To realize inexpensive and highly accurate detection of image density and color shift. SOLUTION: As shown in FIG. The first time point at which the light amount L2 becomes equal to 1 corresponds to the time point at which the center of the irradiation area reaches the boundary of the image, that is, the first light amount difference Δ1 = the first light amount difference Δ2. The light amount detection levels of the light receiving unit and the second light receiving unit are adjusted in advance. Thereby, the regular reflection light amount L1 and the diffusion light amount L2 By detecting the point in time at which is equal to, it is possible to detect the time when the center of the irradiation area has reached the boundary line. The color shift of the image can be detected based on the shift of the arrival time. Also, based on the characteristic that the specular reflection light amount L1 decreases and the diffusion light amount L2 increases as the image density increases, the value of the specular reflection light amount L1 and the diffusion light amount L2 is determined as a value corresponding to the image density. Calculate the ratio.

Inventors

  • 👤 Koji Morofuji
  • 👤 康治 諸藤

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-10-30 15:49
CPC Classifications
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References Cited (Backward Citations)

JPH03209281A Cited
JPH052305A Cited
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JPH09178562A Cited

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