ERECTING EQUAL-MAGNIFICATION LENS ARRAY PLATE, OPTICAL SCANNING UNIT, IMAGE READING DEVICE, AND IMAGE WRITING DEVICE
2012
Online
Patent
An erecting equal-magnification lens array plate comprises first and second lens array plates stacked on one another, a fourth surface light-shielding wall, and an intermediate light-shielding wall. An intermediate through hole formed in the intermediate light-shielding wall is formed such that the hole diameter is progressively smaller in a tapered fashion away from the first lens array plate toward the second lens array plate. An angle of inclination θ of an interior wall surface of the intermediate through hole with respect to a optical axis is given by θ≧tan−1(D4/(Gap+L2+H4))/2 where Gap denotes a gap between the lens array plates, L2 denotes a thickness of the second lens array plate, H4 denotes a height of the fourth surface light-shielding wall, and D4 denotes a diameter of the opening of the fourth surface through hole formed in the fourth surface light-shielding wall facing the image plane.
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ERECTING EQUAL-MAGNIFICATION LENS ARRAY PLATE, OPTICAL SCANNING UNIT, IMAGE READING DEVICE, AND IMAGE WRITING DEVICE
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Autor/in / Beteiligte Person: | OGI, Shuya |
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Veröffentlichung: | 2012 |
Medientyp: | Patent |
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