Scanning optical apparatus

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United States of America Patent

PATENT NO 8797622
APP PUB NO 20140085696A1
SERIAL NO

14037597

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Abstract

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In a scanning optical apparatus, an illumination optical system has a diffractive power φdM in a main scanning direction, a diffractive power φdS in a sub-scanning direction, a refractive power φnM in the main scanning direction, and a refractive power φnS in the sub-scanning direction. A ratio φnM/φdM in the main scanning direction for a focal length fi in a range of 10-30 mm satisfies: g2(fi)≦φnM/φdM≦g1(fi), where A(Z)=(3.532×107)Z2+3023Z+0.7010, B(Z)=(5.719×107)Z2+4169Z+0.7678, C(Z)=(1.727×107)Z2+3244Z+0.4217, D(Z)=(1.373×108)Z2+3232Z+1.224, g1(fi)=fi{D(Z)−B(Z)}/20−0.5D(Z)+1.5B(Z), g2(fi)=fi{C(Z)−D(Z)}/20−0.5C(Z)+1.5A(Z), and a ratio φnS/φdS in the sub-scanning direction satisfies: φnS/φdS<1.3.

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Patent Owner(s)

  • BROTHER KOGYO KABUSHIKI KAISHA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujino, Hitoshi Tajimi, JP 41 445
Hoshino, Hidetaka Aichi-ken, JP 19 70
Nakamura, Yoshifumi Inazawa, JP 93 1186

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