Title:
ROD LENS ARRAY AND IMAGE SENSOR HEAD THAT USES SAME
Document Type and Number:
WIPO Patent Application WO/2013/146873
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a rod lens array, which has a deep depth of focus and a small depth of focus spot. The present invention provides a rod lens array that is equipped with at least one line of rod lenses between two substrates, said line of rod lenses having a plurality of columnar rod lenses wherein the refractive index decreases toward the outer periphery from the center, said rod lenses being arranged in such a manner that the center axes of the rod lenses are substantially parallel to each other. The rod lens array is characterized in that the average value (DOFave) of the depth of focus (DOF) is at least 0.9 mm, and the depth of focus spot (DOFcv) in the scanning direction of the line of rod lenses is not more than 12%.
Inventors:
KITAMURA MASAFUMI (JP)
IRIE KIKUE (JP)
KAWAHARADA YASUSHI (JP)
IRIE KIKUE (JP)
KAWAHARADA YASUSHI (JP)
Application Number:
PCT/JP2013/058987
Publication Date:
October 03, 2013
Filing Date:
March 27, 2013
Export Citation:
Assignee:
MITSUBISHI RAYON CO (JP)
International Classes:
G02B13/26; G02B3/00; G03B27/50; G03B27/54; H04N1/028
Foreign References:
| JP2003139912A | 2003-05-14 | |||
| JP2000035519A | 2000-02-02 | |||
| JPH1114803A | 1999-01-22 | |||
| JP2003072145A | 2003-03-12 |
Attorney, Agent or Firm:
TSUJII Koichi et al. (JP)
辻居 Koichi (JP)
辻居 Koichi (JP)
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