JP2014007765A5 - Illumination device and image forming apparatus - Google Patents
Illumination device and image forming apparatus Download PDFInfo
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- JP2014007765A5 JP2014007765A5 JP2013203953A JP2013203953A JP2014007765A5 JP 2014007765 A5 JP2014007765 A5 JP 2014007765A5 JP 2013203953 A JP2013203953 A JP 2013203953A JP 2013203953 A JP2013203953 A JP 2013203953A JP 2014007765 A5 JP2014007765 A5 JP 2014007765A5
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- lighting device
- illumination device
- concavo
- light source
- light
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- 238000005286 illumination Methods 0.000 title claims description 26
- 230000003287 optical effect Effects 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 239000003086 colorant Substances 0.000 description 1
Description
本発明は、デジタル複写機やイメージスキャナに使用される照明装置、並びに該照明装置を用いた画像形成装置に関する。
The present invention relates to an illumination device used for a digital copying machine or an image scanner, and an image forming apparatus using the illumination device .
本発明は、以上の従来技術における問題に鑑みてなされたものであり、少ない光源数で、小型の照明光学系を有する照度分布の良好な照明装置及び該照明装置を用いた画像形成装置を提供することを目的としている。
The present invention has been made in view of the above problems in the prior art, and provides an illumination device having a small illumination optical system with a small illumination optical system and a good illumination distribution and an image forming apparatus using the illumination device. The purpose is to do.
前記課題を解決するために提供する本発明は、点光源から出射された拡散光の進行方向を、反射面上に設けた凹凸構造によって、無規則に（ランダムに）するものである。これより、照度分布の一様性を上げることが可能となる。具体的には、以下の通りである。
（１） 原稿面を照明する照明装置であって、所定方向に並んだ複数のＬＥＤ光源を有する光源ユニットと、複数の反射面を有し前記光源ユニットから出射した光を集光する光学部と、前記光学部が集光した光を前記原稿面へ向けて反射する複数の反射面を有する反射部と、を有し、前記反射部の複数の反射面のうち、少なくとも前記ＬＥＤ光源の発光面から垂直に出射した光を反射する１面は、入射光の前記複数の光源の配列方向における進行方向を変える凹凸構造を有する反射面であることを特徴とする照明装置。
（２）前記ＬＥＤ光源の発光面から垂直に出射した光は、前記原稿面と平行であることを特徴とする前記（１）に記載の照明装置。
（３） 前記凹凸構造は、基板上に複数の溝が平行に形成された一次元格子をなしていることを特徴とする前記（１）または（２）に記載の照明装置。
（４） 前記凹凸構造は、回折格子をなしていることを特徴とする前記（３）に記載の照明装置。
（５） 前記凹凸構造の溝は、その長手方向が前記読取対象領域の長さ方向に直交して配置されていることを特徴とする前記（３）に記載の照明装置。
（６） 前記凹凸構造の凸部の高さＢと凹部の幅Ａとの比（Ｂ／Ａ）が０．６９２以上であることを特徴とする前記（３）に記載の照明装置。
（７） 前記凹凸構造の凸部の断面形状が矩形、三角形、台形のいずれかであることを特徴とする前記（３）に記載の照明装置。
（８） 前記凹凸構造は、ランダムな砂目状の凹凸構造であることを特徴とする前記（１）または（２）に記載の照明装置。
（９） 前記反射部の反射面が曲面となっていることを特徴とする前記（１）に記載の照明装置。
（１０） 前記ＬＥＤ光源は、蛍光体を用いた１チップ型白色発光ダイオードであることを特徴とする前記（１）から（９）までのいずれかに記載の照明装置。
（１１） 前記ＬＥＤ光源は、それぞれの発光する色が異なる２種以上の発光ダイオードのチップからなり、混色により白色発光させる白色発光ダイオードであることを特徴とする前記（１）から（９）までのいずれかに記載の照明装置。
（１２） 前記（１）乃至（１１）のいずれか１項に記載の照明装置を用いたことを特徴とする画像形成装置。
The present invention provided in order to solve the above-described problems is to randomly (randomly) change the traveling direction of the diffused light emitted from the point light source by the concavo-convex structure provided on the reflecting surface. This makes it possible to improve the uniformity of the illuminance distribution. Specifically, it is as follows.
(1) An illumination device that illuminates a document surface, and includes a light source unit having a plurality of LED light sources arranged in a predetermined direction, and an optical unit that has a plurality of reflection surfaces and collects light emitted from the light source unit. A reflecting portion having a plurality of reflecting surfaces for reflecting the light collected by the optical portion toward the document surface, and at least a light emitting surface of the LED light source among the plurality of reflecting surfaces of the reflecting portion. One surface that reflects light emitted vertically from the light source is a reflecting surface having a concavo-convex structure that changes a traveling direction of incident light in an arrangement direction of the plurality of light sources.
(2) The illumination device according to (1), wherein light emitted perpendicularly from the light emitting surface of the LED light source is parallel to the document surface.
( 3 ) The illumination device according to (1) or (2) , wherein the concavo-convex structure is a one-dimensional lattice in which a plurality of grooves are formed in parallel on a substrate.
( 4 ) The illumination device according to ( 3 ), wherein the concavo-convex structure forms a diffraction grating.
( 5 ) The illumination device according to ( 3 ), wherein the groove of the concavo-convex structure is arranged such that a longitudinal direction thereof is orthogonal to a length direction of the reading target region.
( 6 ) The illumination device according to ( 3 ), wherein a ratio (B / A) between a height B of the convex portion and a width A of the concave portion of the concavo-convex structure is 0.692 or more.
( 7 ) The illumination device according to ( 3 ), wherein a cross-sectional shape of the convex portion of the concavo-convex structure is any of a rectangle, a triangle, and a trapezoid.
( 8 ) The illumination device according to (1) or (2) , wherein the concavo-convex structure is a random grainy concavo-convex structure .
(9 ) The illumination device according to (1), wherein a reflection surface of the reflection portion is a curved surface .
(10 ) The illumination device according to any one of (1) to ( 9 ), wherein the LED light source is a one-chip type white light emitting diode using a phosphor.
( 11 ) From (1) to ( 9 ), wherein the LED light source is a white light emitting diode that includes two or more types of light emitting diode chips that emit different colors and emits white light by color mixture. The illuminating device in any one of.
( 12 ) An image forming apparatus using the illumination device according to any one of (1) to ( 11 ).
本発明によれば、小型で光源数が少なく、照度ムラの少ない照明光学系を有する照明装置を構成することが可能となる。また、該照明装置を用いることにより、小型ながら良好な画像形成が可能な画像形成装置を提供することができる。
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to comprise the illuminating device which has an illumination optical system with a small size, a small number of light sources, and little illuminance unevenness. Further, by using the illumination device , it is possible to provide an image forming apparatus capable of forming a good image while being small.
Claims (12)
所定方向に並んだ複数のＬＥＤ光源を有する光源ユニットと、A light source unit having a plurality of LED light sources arranged in a predetermined direction;
複数の反射面を有し前記光源ユニットから出射した光を集光する光学部と、An optical unit having a plurality of reflecting surfaces and collecting light emitted from the light source unit;
前記光学部が集光した光を前記原稿面へ向けて反射する複数の反射面を有する反射部と、を有し、A reflection part having a plurality of reflection surfaces for reflecting the light collected by the optical part toward the document surface;
前記反射部の複数の反射面のうち、少なくとも前記ＬＥＤ光源の発光面から垂直に出射した光を反射する１面は、入射光の前記複数の光源の配列方向における進行方向を変える凹凸構造を有する反射面であることを特徴とする照明装置。Of the plurality of reflecting surfaces of the reflecting portion, at least one surface that reflects light emitted perpendicularly from the light emitting surface of the LED light source has an uneven structure that changes the traveling direction of incident light in the arrangement direction of the plurality of light sources. A lighting device characterized by being a reflecting surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013203953A JP2014007765A (en) | 2013-09-30 | 2013-09-30 | Image reader and image formation apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013203953A JP2014007765A (en) | 2013-09-30 | 2013-09-30 | Image reader and image formation apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007228756A Division JP2009063613A (en) | 2007-09-04 | 2007-09-04 | Image reading apparatus and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2014007765A JP2014007765A (en) | 2014-01-16 |
| JP2014007765A5 true JP2014007765A5 (en) | 2014-07-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2013203953A Pending JP2014007765A (en) | 2013-09-30 | 2013-09-30 | Image reader and image formation apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2014007765A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0745802Y2 (en) * | 1990-07-30 | 1995-10-18 | 株式会社三協精機製作所 | Image recognition device |
| JP3659770B2 (en) * | 1997-05-21 | 2005-06-15 | 株式会社リコー | Line light generator |
| JP2002142082A (en) * | 2000-10-31 | 2002-05-17 | Pfu Ltd | Image reading device |
| JP4533235B2 (en) * | 2004-07-29 | 2010-09-01 | 株式会社リコー | Document illumination device, image reading device, and image forming device |
| JP2006245955A (en) * | 2005-03-02 | 2006-09-14 | Ricoh Co Ltd | Image reader |
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- 2013-09-30 JP JP2013203953A patent/JP2014007765A/en active Pending
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