GRADIENT INDEX LENS, ROD LENS ARRAY, IMAGE SCANNER, PRINTER, INSPECTION DEVICE AND GLASS COMPOSITION

To provide a gradient index lens having a large depth of field.SOLUTION: A gradient index lens (1b) has a depth of field of 1.5 to 3.0 mm. The depth of field is determined by subtracting a minimum value from a maximum value of a working distance. At the working distance, a modulation transfer functi...

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Bibliographic Details
Main Authors TANIGUCHI SATOSHI, SATO KENICHI, YAMANE TAKESHI, KANEKO NORIFUMI, KATO HIROAKI, TAKAGI TOMOTAKA
Format Patent
LanguageEnglish
Japanese
Published 20.09.2023
Subjects
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS
CHEMISTRY
GLASS
JOINING GLASS TO GLASS OR OTHER MATERIALS
METALLURGY
MINERAL OR SLAG WOOL
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS
SURFACE TREATMENT OF GLASS
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Summary:To provide a gradient index lens having a large depth of field.SOLUTION: A gradient index lens (1b) has a depth of field of 1.5 to 3.0 mm. The depth of field is determined by subtracting a minimum value from a maximum value of a working distance. At the working distance, a modulation transfer function (MTF) value at a spatial frequency of 6 lines/mm is 30% or more.SELECTED DRAWING: Figure 1 【課題】大きな被写界深度を有する屈折率分布型レンズを提供する。【解決手段】屈折率分布型レンズ（１ｂ）は、１．５～３．０ｍｍの被写界深度を有する。被写界深度は、作動距離の最大値から最小値を差し引いて決定される。作動距離において、６本／ｍｍの空間周波数における変調伝達関数（ＭＴＦ）の値が３０％以上である。【選択図】図１
Bibliography:Application Number: JP20230109333