JP2020121922A5 - Refractive index distributed lenses, rod lens arrays, image scanners, printers, and inspection equipment - Google Patents
Refractive index distributed lenses, rod lens arrays, image scanners, printers, and inspection equipment Download PDFInfo
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- JP2020121922A5 JP2020121922A5 JP2020076111A JP2020076111A JP2020121922A5 JP 2020121922 A5 JP2020121922 A5 JP 2020121922A5 JP 2020076111 A JP2020076111 A JP 2020076111A JP 2020076111 A JP2020076111 A JP 2020076111A JP 2020121922 A5 JP2020121922 A5 JP 2020121922A5
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- Prior art keywords
- refractive index
- index distribution
- distribution type
- type lens
- rod lens
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- 238000007689 inspection Methods 0.000 title claims description 3
- 238000003491 array Methods 0.000 title 1
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
Description
特許文献１及び２には、屈折率分布型レンズを用いることは記載されていない。特許文献３～５に記載の屈折率分布型レンズは大きな開口角を有している。このことは、屈折率分布型レンズにおいて大きな被写界深度を実現する観点から有利とは言い難く、特許文献３～５に記載の屈折率分布型レンズの被写界深度は小さいと考えられる。屈折率分布型レンズの被写界深度が小さいと、例えば、対象物の厚みにばらつきがある場合に対象物において焦点が合う部分と焦点が合わない部分とが発生しうる。 Patent Documents 1 and 2 do not describe the use of a refractive index distribution type lens. The refractive index distribution type lenses described in Patent Documents 3 to 5 have a large aperture angle. This cannot be said to be advantageous from the viewpoint of realizing a large depth of field in the refractive index distribution type lens, and it is considered that the depth of field of the refractive index distribution type lens described in Patent Documents 3 to 5 is small. When the depth of field of the refractive index distribution type lens is small, for example, when the thickness of the object varies, a portion of the object that is in focus and a portion that is out of focus may occur.
このような事情に鑑み、本発明は、対象物の厚みにばらつきがある場合でも対象物において焦点が合う部分と焦点が合わない部分とが発生しにくい、屈折率分布型レンズを提供する。 In view of such circumstances, the present invention provides a refractive index distribution type lens in which a focused portion and an out-of-focus portion are less likely to occur in an object even if the thickness of the object varies.
本発明は、
屈折率分布型レンズであって、
１．５～３．０ｍｍの被写界深度を有し、
前記被写界深度は、当該屈折率分布型レンズと結像位置との距離を一定に保った状態で作動距離の最大値から最小値を差し引いて決定され、
前記作動距離において、６本／ｍｍの空間周波数における変調伝達関数（ＭＴＦ）の値が３０％以上であり、
当該屈折率分布型レンズの半径ｒにおける屈折率ｎ（ｒ）及び当該屈折率分布型レンズの中心における屈折率ｎ
0
は、近軸領域でｎ（ｒ）＝ｎ
0
×{１－（Ａ／２）×ｒ
2
}の関係を満たし、
前記関係におけるＡの平方根である屈折率分布定数は、０．１３０～０．２３０ｍｍ
-1
であり、
３°～６°の開口角を有する、
屈折率分布型レンズを提供する。
The present invention
It is a refractive index distribution type lens.
It has a depth of field of 1.5 to 3.0 mm and has a depth of field of 1.5 to 3.0 mm.
The depth of field is determined by subtracting the minimum value from the maximum value of the working distance while keeping the distance between the refractive index distribution type lens and the imaging position constant.
At the working distance, the value of the modulation transfer function (MTF) at a spatial frequency of 6 lines / mm is 30% or more.
The refractive index n (r) at the radius r of the refractive index distribution type lens and the refractive index n 0 at the center of the refractive index distribution type lens are n (r) = n 0 × {1- (A / ) in the near axis region. 2) Satisfy the relationship of × r 2 },
The refractive index distribution constant, which is the square root of A in the above relationship, is 0.130 to 0.230 mm -1 .
With an opening angle of 3 ° to 6 °,
A refractive index distribution type lens is provided.
本発明は、
光軸が平行になるように一列または二列以上に主走査方向に配列されている、上記の屈折率分布型レンズを備えた、ロッドレンズアレイを提供する。
The present invention
Provided is a rod lens array including the above-mentioned refractive index distribution type lens, which is arranged in one row or two or more rows in the main scanning direction so that the optical axes are parallel to each other.
本発明は、
上記のロッドレンズアレイと、
ライン状受光素子と、
ライン状照明装置と、を備える
イメージスキャナを提供する。
The present invention
With the above rod lens array,
With a line-shaped light receiving element,
Equipped with a line-shaped lighting device
Provides an image scanner.
本発明は、
上記のロッドレンズアレイを備えるプリンタを提供する。
The present invention
A printer equipped with the above rod lens array is provided .
本発明は、
上記のロッドレンズアレイを備える検査装置を提供する。
The present invention
An inspection device including the above rod lens array is provided .
上記の屈折率分布型レンズによれば、対象物の厚みにばらつきがある場合でも対象物において焦点が合う部分と焦点が合わない部分とが発生しにくい。According to the above-mentioned refractive index distribution type lens, even if the thickness of the object varies, it is unlikely that a focused portion and an out-of-focus portion occur in the object.
Claims (6)
１．５～３．０ｍｍの被写界深度を有し、
前記被写界深度は、当該屈折率分布型レンズと結像位置との距離を一定に保った状態で作動距離の最大値から最小値を差し引いて決定され、
前記作動距離において、６本／ｍｍの空間周波数における変調伝達関数（ＭＴＦ）の値が３０％以上であり、
当該屈折率分布型レンズの半径ｒにおける屈折率ｎ（ｒ）及び当該屈折率分布型レンズの中心における屈折率ｎ0は、近軸領域でｎ（ｒ）＝ｎ0×{１－（Ａ／２）×ｒ2}の関係を満たし、
前記関係におけるＡの平方根である屈折率分布定数は、０．１３０～０．２３０ｍｍ-1であり、
３°～６°の開口角を有する、
屈折率分布型レンズ。 It is a refractive index distribution type lens.
It has a depth of field of 1.5 to 3.0 mm and has a depth of field of 1.5 to 3.0 mm.
The depth of field is determined by subtracting the minimum value from the maximum value of the working distance while keeping the distance between the refractive index distribution type lens and the imaging position constant.
At the working distance, the value of the modulation transfer function (MTF) at a spatial frequency of 6 lines / mm is 30% or more.
The refractive index n (r) at the radius r of the refractive index distribution type lens and the refractive index n 0 at the center of the refractive index distribution type lens are n (r) = n 0 × {1- (A /) in the near axis region. 2) Satisfy the relationship of × r 2 },
The refractive index distribution constant, which is the square root of A in the above relationship, is 0.130 to 0.230 mm -1 .
With an opening angle of 3 ° to 6 °,
Refractive index distribution type lens.
ライン状受光素子と、
ライン状照明装置と、を備える
イメージスキャナ。 The rod lens array according to claim 3 and
With a line-shaped light receiving element,
An image scanner equipped with a line-shaped lighting device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020076111A JP7308171B2 (en) | 2019-01-29 | 2020-04-22 | Gradient index lenses, rod lens arrays, image scanners, printers, and inspection equipment |
| JP2023109333A JP2023130429A (en) | 2019-01-29 | 2023-07-03 | Gradient index lens, rod lens array, image scanner, printer, inspection device and glass composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019012727A JP6875431B2 (en) | 2019-01-29 | 2019-01-29 | Refraction distribution type lenses, optical products, optical instruments, glass compositions for refraction distribution type lenses, and methods for manufacturing refraction distribution type lenses. |
| JP2020076111A JP7308171B2 (en) | 2019-01-29 | 2020-04-22 | Gradient index lenses, rod lens arrays, image scanners, printers, and inspection equipment |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2019012727A Division JP6875431B2 (en) | 2019-01-29 | 2019-01-29 | Refraction distribution type lenses, optical products, optical instruments, glass compositions for refraction distribution type lenses, and methods for manufacturing refraction distribution type lenses. |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2023109333A Division JP2023130429A (en) | 2019-01-29 | 2023-07-03 | Gradient index lens, rod lens array, image scanner, printer, inspection device and glass composition |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2020121922A JP2020121922A (en) | 2020-08-13 |
| JP2020121922A5 true JP2020121922A5 (en) | 2022-02-02 |
| JP7308171B2 JP7308171B2 (en) | 2023-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2020076111A Active JP7308171B2 (en) | 2019-01-29 | 2020-04-22 | Gradient index lenses, rod lens arrays, image scanners, printers, and inspection equipment |
| JP2023109333A Pending JP2023130429A (en) | 2019-01-29 | 2023-07-03 | Gradient index lens, rod lens array, image scanner, printer, inspection device and glass composition |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2023109333A Pending JP2023130429A (en) | 2019-01-29 | 2023-07-03 | Gradient index lens, rod lens array, image scanner, printer, inspection device and glass composition |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3328615B2 (en) | 1990-06-12 | 2002-09-30 | 三菱レイヨン株式会社 | Graded-index plastic optical transmitter |
| JPH06276359A (en) * | 1993-03-18 | 1994-09-30 | Fuji Xerox Co Ltd | Color picture reader |
| JP2000035519A (en) | 1998-07-17 | 2000-02-02 | Mitsubishi Rayon Co Ltd | Optical transmission body, optical transmission body array and image sensor |
| JP2001174606A (en) | 1999-12-20 | 2001-06-29 | Nippon Sheet Glass Co Ltd | Image forming optical device |
| JP5839167B2 (en) | 2011-08-10 | 2016-01-06 | 株式会社リコー | Observation device |
-
2020
- 2020-04-22 JP JP2020076111A patent/JP7308171B2/en active Active
-
2023
- 2023-07-03 JP JP2023109333A patent/JP2023130429A/en active Pending
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