JPH04150454A - Picture reader - Google Patents
Picture readerInfo
- Publication number
- JPH04150454A JPH04150454A JP2273629A JP27362990A JPH04150454A JP H04150454 A JPH04150454 A JP H04150454A JP 2273629 A JP2273629 A JP 2273629A JP 27362990 A JP27362990 A JP 27362990A JP H04150454 A JPH04150454 A JP H04150454A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light sources
- light source
- original
- reflecting plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000003086 colorant Substances 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Image Input (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、画像読み取り装置の光源の反射板の構成に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a reflector of a light source of an image reading device.
画像読み取り装置の主な読み取り方法は、−次元配列の
光源、−次元配列の光電気変換素子からなる光学ヘッド
を構成し、これを配列と直角方向に平行移動することに
より平面原稿を読み取るものである。この場合、原稿の
内容を忠実に光学ヘッドの出力に再現するため、−次元
配列の光源は原稿の読み取り部分を均一な光量にて照射
していることが望ましい。The main reading method for image reading devices consists of an optical head consisting of a -dimensional array of light sources and a -dimensional array of photoelectric conversion elements, and reads a flat document by moving this head in parallel in a direction perpendicular to the array. be. In this case, in order to faithfully reproduce the contents of the document in the output of the optical head, it is desirable that the -dimensional array of light sources illuminate the read portion of the document with a uniform amount of light.
現在、−次元配列光源として、冷陰極ランプ・熱陰極ラ
ンプ・ハロゲンランプ等が用いられているが、これらは
特に光源の中央部・端部にて光量に違いが出てしまう。Currently, cold cathode lamps, hot cathode lamps, halogen lamps, and the like are used as -dimensionally arrayed light sources, but there is a difference in the amount of light especially at the center and ends of the light source.
このため従来の技術では光量の一様性を図るため光量補
正機構を用いてきた。具体的には一次元配列光源の光量
の不足する部分に反射板を設け、間接光の多少により一
次元方向の光量分布が一様になるよう調整するものであ
る。For this reason, in conventional technology, a light amount correction mechanism has been used to ensure uniformity of light amount. Specifically, a reflecting plate is provided in a portion of the one-dimensionally arrayed light source where the amount of light is insufficient, and the light amount distribution in the one-dimensional direction is adjusted to be uniform depending on the amount of indirect light.
（発明が解決しようとする課題 〕
ところが、画像読み取り装置のカラー化が進み光源を２
種類以上用いるようになると、従来の光量補正機構がう
まく機能しない場合が発生する。(Problem to be solved by the invention) However, as image reading devices become more color-based, the number of light sources becomes two.
If more than one type of light source is used, the conventional light amount correction mechanism may not function properly.
つまり従来の補正機構は補正量がどの光源に対しても一
定のため、各−次元配列光源の光量分布が全く同一の場
合は問題ないが、異なる場合は各色の光源に於いて良好
な補正は不可能であった。In other words, in the conventional correction mechanism, the amount of correction is constant for all light sources, so there is no problem if the light intensity distribution of each dimensional array light source is exactly the same, but if they are different, good correction is not possible for each color light source. It was impossible.
そこで本発明はこの問題を解決するもので、その目的と
するところは、２種類以上の一次元配列光源においても
光量分布の良好な補正を行う画像読み取り装置を提供す
ることにある。SUMMARY OF THE INVENTION The present invention is intended to solve this problem, and an object of the present invention is to provide an image reading device that can satisfactorily correct the light amount distribution even when using two or more types of one-dimensionally arrayed light sources.
（課題を解決するための手段〕
本発明の画像読み取り装置は、読み取る原稿を２色以上
の光で照らす光源と、前記光源の間接反射光を原稿照射
に利用する反射板と、前記光源により原稿を照らしでき
た像を光電気変換素子に結像させ、像に応じた出力を得
るための光学ヘッドを備えた画で像読み取り装置におい
て、前記光源の光を各色均一に原稿に照射するよう反射
板を備えたことを特徴とする。(Means for Solving the Problems) An image reading device of the present invention includes a light source that illuminates a document to be read with light of two or more colors, a reflector that uses indirect reflected light from the light source to illuminate the document, and a light source that illuminates the document by the light source. The image that has been illuminated is formed on a photoelectric conversion element, and an image reading device equipped with an optical head to obtain an output according to the image reflects the light from the light source so that each color is uniformly irradiated onto the document. It is characterized by having a board.
以下、図面を用いて詳細に説明する。 Hereinafter, it will be explained in detail using the drawings.
第１図は、本発明による実施例の画像読み取り装置の構
成図である。この画像読み取り装置は光源２−ａ・２−
ｂ、 反射板１、ミラー６、 レンズ３、光電気変換
素子４が光学ヘッドを構成し、原稿５上を移動し読み取
りを行う。ここでは−次元配列の光源２−ａ（緑色）、
２−ｂ（赤色）の２種類として説明する。光は一次元配
列光源２−ａ、２−ｂから供給され原稿５を照射し、そ
の像がミラー６、レンズ３により光電気変換素子４に結
像する仕組みになっている。反射板１は一次元配列光源
２−ａ、２−ｂの光を効率良く原稿５に照射するために
、光源に対して原稿５の反対側に配置している。また、
光電気変換素子４は原稿５のＰ点からＱ点までを読み取
り電気信号に変換する。FIG. 1 is a block diagram of an image reading device according to an embodiment of the present invention. This image reading device has light sources 2-a and 2-
b. The reflecting plate 1, the mirror 6, the lens 3, and the photoelectric conversion element 4 constitute an optical head, which moves over the original 5 and reads it. Here, -dimensional array light source 2-a (green),
This will be explained as two types: 2-b (red). Light is supplied from one-dimensional array light sources 2-a and 2-b and illuminates the original 5, and its image is formed on the photoelectric conversion element 4 by the mirror 6 and lens 3. The reflecting plate 1 is arranged on the opposite side of the original 5 with respect to the light sources in order to efficiently irradiate the original 5 with light from the one-dimensional array light sources 2-a and 2-b. Also,
The photoelectric conversion element 4 reads the information from point P to point Q on the original 5 and converts it into an electrical signal.
第２図は一次元配列の光源２−ａ、２−ｂ単体での光量
分布図である。２種類の光源２−ａ、２−ｂはＰ点から
Ｑ点の光量分布に図の様な違いを持っている。このまま
の状態で使用すると反射率の−様な原稿５であっても、
光源２−ａにて原稿を照射して光電気変換素子から得ら
れる電気信号は山なりの出力となり、光源２−ｂを使用
して光電気変換素子から得られる電気信号は谷形の出力
となる。 （この場合、ミラー６、 レンズ３、光電気
変換素子４に依存する出力の変化は無視する。）これで
は読み取り原稿と出力信号の相関関係に直線性を失い、
画像読み取り装置の性能を損なってしまう。FIG. 2 is a light amount distribution diagram for the one-dimensional array of light sources 2-a and 2-b. The two types of light sources 2-a and 2-b have a difference in light amount distribution from point P to point Q as shown in the figure. Even if the original 5 has a negative reflectance when used in its current state,
The electrical signal obtained from the photoelectric conversion element by irradiating the document with light source 2-a is a mountain-shaped output, and the electrical signal obtained from the photoelectric conversion element using light source 2-b is a valley-shaped output. Become. (In this case, changes in the output depending on the mirror 6, lens 3, and photoelectric conversion element 4 are ignored.) In this case, the correlation between the read document and the output signal loses linearity,
This will impair the performance of the image reading device.
第３図は従来の反射板の効果を説明する解説図である。FIG. 3 is an explanatory diagram illustrating the effect of a conventional reflector.
従来の反射板は原稿をできるだけ明るくするように高反
射率の白色シート、または金属板を光量の不足する部分
に使用してきた。しかしこの方法では、仮に第３１１（
ａ）の様に両端部分に白色シートを貼り中央に行くに従
い黒くした反射板を使用したとしても、光源２−ａでは
−様な光量分布を得られるが光源２−ｂではさらに悪化
した光量分布となってしまう。 （第３図（ｂ）（Ｃ）
） このように従来の方法では発色・光量分布共に異
なる２種類の光源に対して同時に良好な補正を行うこと
ができない。Conventional reflectors use highly reflective white sheets or metal plates in areas where the amount of light is insufficient to make the original as bright as possible. However, with this method, if the 311th (
Even if a reflective plate is used with white sheets attached to both ends and blackened toward the center as shown in a), a --like light intensity distribution can be obtained with light source 2-a, but an even worse light intensity distribution with light source 2-b. It becomes. (Figure 3(b)(C)
) As described above, with the conventional method, it is not possible to simultaneously perform good correction for two types of light sources that differ in color generation and light intensity distribution.
第４図は本発明の詳細な説明する解説図である。FIG. 4 is an explanatory diagram for explaining the present invention in detail.
本発明による反射板の特徴は、各光源の発色ごとに補正
をかけるためにそれぞれの発色と同じ色で反射板を想定
し、これらを全て色合成して反射板を作ることにある。The feature of the reflector according to the present invention is that in order to apply correction for each color produced by each light source, the reflector is assumed to have the same color as each color produced, and the reflector is made by combining all of these colors.
第１０の実施例における２種類の光源で考えると、まず
光源２−ａ（緑）は緑色にて反射板を想定する。 （第
４図（ａ）） 次に光源２−ｂ（赤）専用の反射板を
赤色で想定する。Considering the two types of light sources in the tenth embodiment, first, the light source 2-a (green) is assumed to be a green reflector. (FIG. 4(a)) Next, assume that a red reflector is used exclusively for the light source 2-b (red).
（第４図（ｂ）） この２種類を色合成して作成する
反射板（第４図（Ｃ））は光ｆｉ２−ａ、２−ｂのどち
らにも有効な補正を行うことのできる反射板となる。(Fig. 4 (b)) The reflector plate (Fig. 4 (C)) created by combining these two types of colors is a reflector that can effectively correct both light fi2-a and fi2-b. It becomes a board.
第５図は本発明の効果を示す光源２−ａ、２−ｂの光量
分布図である。本発明の反射板を使用することで２種類
の光源とも良好な光量分布が得られる。FIG. 5 is a light quantity distribution diagram of the light sources 2-a and 2-b showing the effects of the present invention. By using the reflector of the present invention, good light intensity distribution can be obtained for both types of light sources.
〔発明の効果〕
以上、述べたように本発明によれば、色及び光量分布が
異なる２種類以上の光源を用いても、良好な光量分布に
よる原稿照射が可能な画像読み取り装置を提供すること
ができる。[Effects of the Invention] As described above, the present invention provides an image reading device capable of irradiating a document with a good light intensity distribution even when using two or more types of light sources with different colors and light intensity distributions. I can do it.
第１図は、本発明による画像読み取り装置の実施例を示
す構成図。第２図は一次元配列光源の光量分布を示す光
量分布図。第３図は従来の反射板を使用した場合の問題
点を説明する解説図。第４図は、本発明による反射板の
内容を解説するための解説図。第５図は、本発明の効果
をしめす光量分布図。 １ ・・・ 反射
板２−ａ・・・ 光源（緑〉
２−ｂ・・・ 光源（赤）
３ ・・・ レンズ
４ ・・・ 光電気変換素子
５ ・・・ 原稿
６ ・・・ ミラー
Ｐ７乞 吠＜に）
）Ｊニー＆ＩＡ−１ｔｌＲｔ：ａｔｉ；Ｉｋ ２− ｂ
ｎｒＬ÷！〕−よｊ乙２Ｊぐｊ！４〜へ“１５
（ｃ ）＃Ｊ ２− ａ、２− ｂ Ａ ＦｆＪ／）Ｉ
ＵｆＭ第４図
（ａ）４１ＦＪｔｒＵｆＪｂｉより１Ｊ２−ａｉｒｙ！
１４レチ第５図FIG. 1 is a configuration diagram showing an embodiment of an image reading device according to the present invention. FIG. 2 is a light amount distribution diagram showing the light amount distribution of a one-dimensional array light source. FIG. 3 is an explanatory diagram illustrating problems when using a conventional reflector. FIG. 4 is an explanatory diagram for explaining the contents of the reflector according to the present invention. FIG. 5 is a light amount distribution diagram showing the effects of the present invention. 1...Reflector plate 2-a...Light source (green) 2-b...Light source (red) 3...Lens 4...Photoelectric conversion element 5...Original 6...Mirror P7 beggar
) J knee &IA-1tlRt:ati;Ik 2- b
nrL÷! ]-YojOtsu2Jguj! 4~ to “15 (c) #J 2-a, 2-b A FfJ/)I
UfM Figure 4 (a) 1J2-airy from 41FJtrUfJbi!
14 Rechi Figure 5
Claims (1)
の間接反射光を原稿照射に利用する反射板と、前記光源
により原稿を照らしできた像を光電気変換素子に結像さ
せ、像に応じた出力を得るための光学ヘッドを備えた画
像読み取り装置において、前記光源の光を各色均一に原
稿に照射するよう反射板を備えたことを特徴とする画像
読み取り装置。A light source that illuminates the document to be read with light of two or more colors, a reflector that uses indirect reflected light from the light source to illuminate the document, and a photoelectric conversion element that forms an image of the document illuminated by the light source, which converts the image into an image. What is claimed is: 1. An image reading device equipped with an optical head for obtaining a corresponding output, characterized in that the image reading device is equipped with a reflecting plate so that light from the light source uniformly irradiates a document with each color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2273629A JPH04150454A (en) | 1990-10-12 | 1990-10-12 | Picture reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2273629A JPH04150454A (en) | 1990-10-12 | 1990-10-12 | Picture reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04150454A true JPH04150454A (en) | 1992-05-22 |
Family
ID=17530371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2273629A Pending JPH04150454A (en) | 1990-10-12 | 1990-10-12 | Picture reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04150454A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012253747A (en) * | 2011-05-11 | 2012-12-20 | Canon Components Inc | Image sensor unit, image reader using the same and image forming device |
| US8681398B2 (en) | 2010-12-28 | 2014-03-25 | Canon Components, Inc. | Image sensor unit and image reader |
| US8755096B2 (en) | 2011-08-09 | 2014-06-17 | Canon Components, Inc. | Image sensor unit and image reading apparatus |
| US8786915B2 (en) | 2010-12-17 | 2014-07-22 | Canon Components, Inc. | Image sensor unit and image reading apparatus using the same |
| US8842344B2 (en) | 2010-12-21 | 2014-09-23 | Canon Components, Inc. | Image sensor unit and image reader |
| US8885230B2 (en) | 2010-12-10 | 2014-11-11 | Canon Components, Inc. | Image sensor unit and image reading apparartus |
| US9253359B2 (en) | 2009-12-28 | 2016-02-02 | Canon Components, Inc. | Contact image sensor unit including a detachable light guide supporting member and image reading apparatus using the same |
-
1990
- 1990-10-12 JP JP2273629A patent/JPH04150454A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9253359B2 (en) | 2009-12-28 | 2016-02-02 | Canon Components, Inc. | Contact image sensor unit including a detachable light guide supporting member and image reading apparatus using the same |
| US8885230B2 (en) | 2010-12-10 | 2014-11-11 | Canon Components, Inc. | Image sensor unit and image reading apparartus |
| US9131099B2 (en) | 2010-12-10 | 2015-09-08 | Canon Components, Inc. | Image sensor unit and image reading apparatus |
| US8786915B2 (en) | 2010-12-17 | 2014-07-22 | Canon Components, Inc. | Image sensor unit and image reading apparatus using the same |
| US8842344B2 (en) | 2010-12-21 | 2014-09-23 | Canon Components, Inc. | Image sensor unit and image reader |
| US8681398B2 (en) | 2010-12-28 | 2014-03-25 | Canon Components, Inc. | Image sensor unit and image reader |
| JP2012253747A (en) * | 2011-05-11 | 2012-12-20 | Canon Components Inc | Image sensor unit, image reader using the same and image forming device |
| US8643915B2 (en) | 2011-05-11 | 2014-02-04 | Canon Components, Inc. | Image sensor unit, and image reading apparatus and image forming apparatus using the same |
| US8964262B2 (en) | 2011-05-11 | 2015-02-24 | Canon Components, Inc. | Image sensor unit, and image reading apparatus and image forming apparatus using the same |
| US8755096B2 (en) | 2011-08-09 | 2014-06-17 | Canon Components, Inc. | Image sensor unit and image reading apparatus |
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