JPH01296764A - Led array light source - Google Patents
Led array light sourceInfo
- Publication number
- JPH01296764A JPH01296764A JP63126429A JP12642988A JPH01296764A JP H01296764 A JPH01296764 A JP H01296764A JP 63126429 A JP63126429 A JP 63126429A JP 12642988 A JP12642988 A JP 12642988A JP H01296764 A JPH01296764 A JP H01296764A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- led array
- array light
- light emitting
- emitting elements
- 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
- 239000000758 substrate Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 abstract description 13
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000005286 illumination Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 244000221110 common millet Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Character Input (AREA)
- Image Input (AREA)
- Facsimile Scanning Arrangements (AREA)
- Led Device Packages (AREA)
- Led Devices (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はファクシミリ、ＯＣＲ等の光学的画像読み取り
装置において、原稿の原稿面を照明するＬＥＤアレイ光
源に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an LED array light source for illuminating the surface of a document in an optical image reading device such as a facsimile or OCR.
従来の技術
パーソナルコンピュータや文章作成装置等のオフィスオ
ートメーション化の進歩に伴ない、図面や文章を入力す
るための画像人力装置において原稿を照明する光源部に
高輝度で且つコンパクトなＬＥＤアレイ光源が用いられ
るようなりつつある。Conventional Technology With the advancement of office automation such as personal computers and text creation devices, high-intensity and compact LED array light sources are being used as light sources to illuminate documents in human-powered image devices for inputting drawings and text. It is becoming possible to do so.
以下図面を参照しながら、従来の複数種類の異なる発光
波長を持つ発光素子を有するＬＥＤアレイ光源（以下従
来のＬＥＤアレイ光源と記す）について説明する。A conventional LED array light source (hereinafter referred to as a conventional LED array light source) having a plurality of types of light emitting elements having different emission wavelengths will be described with reference to the drawings.
第２図（ａ）、Φ）は従来のＬＥＤアレイ光源の一例の
構成を示すもので、第２図（ａ）は断面図、第２図（ロ
）は基板上の発光素子の配列状態を示す斜視図である。Figures 2(a) and Φ) show the configuration of an example of a conventional LED array light source. Figure 2(a) is a cross-sectional view, and Figure 2(b) shows the arrangement of light emitting elements on the substrate. FIG.
第２図（ａ）において１は発光素子、２は発光素子ｌか
ら発光された光を集光する集光レンズ、４は発光素子１
を配列する基板、３は集光レンズを固定するホルダーで
ある。In FIG. 2(a), 1 is a light emitting element, 2 is a condensing lens that collects the light emitted from the light emitting element 1, and 4 is the light emitting element 1.
3 is a holder for fixing the condenser lens.
第２図（ロ）において、４は基板、５．６はそれぞれ発
光波長の異なる発光素子Ａ、発光素子Ｂである。In FIG. 2(b), 4 is a substrate, and 5.6 is a light-emitting element A and a light-emitting element B, each having a different emission wavelength.
また、第２図（ａ）、 （ｂ）において！。は、隣接す
る発光素子との間隔を表わしている。Also, in Figure 2 (a) and (b)! . represents the distance between adjacent light emitting elements.
以上のように構成されたＬＥＤアレイ光源について以下
、その作用について説明する。The operation of the LED array light source configured as above will be described below.
第２図（ａ）、 （ｂ）に示されたＬＥＤアレイ光源は
例えば発光素子Ａ５と発光素子Ｂ６を外部からの電圧印
加等によって選択的に発光させることにより異なる色の
光を発光させることが可能であり、カラー画像読み取り
装置において原稿照明用の光源に用いる場合、赤色、青
色、黄色の３種類の発光波長を有する発光素子を内蔵し
たＬＥＤアレイ光源であれば前記３種類の発光素子を選
択的に発光させることによりカラーの原稿読み取りが一
本のＬＥＤアレイ光源を用いることで可能になる。The LED array light source shown in FIGS. 2(a) and 2(b) can emit light of different colors, for example, by selectively causing light emitting element A5 and light emitting element B6 to emit light by applying a voltage from the outside. possible, and when used as a light source for document illumination in a color image reading device, if the LED array light source has built-in light emitting elements having three types of emission wavelengths: red, blue, and yellow, the above three types of light emitting elements are selected. By emitting light, it is possible to read a color document using a single LED array light source.
発明が解決しようとする課題
従来のような構成のＬＥＤアレイ光源は両端部の照度が
中心部と比較して低くなり、例えば画像読み取り装置の
原稿照明用の光源に用いる場合原稿面を一定の照度で照
明するためには必要とする照度範囲よりも広い照度範囲
をもつ長さのＬＥＤアレイ光源が必要となり、それによ
り画像読み取り装置が大きくなってしまうという問題点
があった。Problems to be Solved by the Invention In an LED array light source with a conventional configuration, the illuminance at both ends is lower than that at the center. In order to provide illumination, an LED array light source having a length that has a wider illuminance range than the required illuminance range is required, which poses a problem in that the image reading device becomes larger.
課題を解決するための手段
上記課題を解決するために、本発明のＬＥＤアレイ光源
はＬＥＤアレイ光源の中央部と両端部において、隣接す
る発光素子の間隔が異なるように配置するものである。Means for Solving the Problems In order to solve the above problems, the LED array light source of the present invention is arranged such that the spacing between adjacent light emitting elements is different in the center and both ends of the LED array light source.
作用
本発明は上記した構成によって、ＬＥＤアレイ光源の両
端部における照度低下をなくし、ＬＥＤアレイ光源の中
心部と両端部の照度の差を小さくすることによって、均
一な照度分布の範囲を広くするものである。Effect The present invention uses the above-described configuration to eliminate the decrease in illuminance at both ends of the LED array light source, and to reduce the difference in illuminance between the center and both ends of the LED array light source, thereby widening the range of uniform illuminance distribution. It is.
実施例
以下、本発明の一実施例について、図面を用いて説明す
る。EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図（ａ）は本発明のＬＥＤアレイ光源の構成の一例
を示す図で第１図（ｂ）は本発明におけるＬＥＤアレイ
光源の発光素子の基板上の配置を示す斜視図であり、第
１図（Ｃ）は、本発明のＬＥＤアレイ光源と、従来のＬ
ＥＤアレイ光源の照度分布の比較を示すグラフである。FIG. 1(a) is a diagram showing an example of the configuration of an LED array light source of the present invention, and FIG. 1(b) is a perspective view showing the arrangement of light emitting elements of the LED array light source of the present invention on a substrate. Figure 1 (C) shows the LED array light source of the present invention and the conventional L
It is a graph showing a comparison of illuminance distributions of ED array light sources.
第１図（ａ）において、４は複数の発光素子を配列する
基板、２は発光素子１により発光される光を集光する働
きをもつ集光レンズ、３は前記集光レンズを固定する働
きをもつホルダ一部、そしてｌは発光素子である。In FIG. 1(a), 4 is a substrate on which a plurality of light emitting elements are arranged, 2 is a condenser lens that functions to condense the light emitted by the light emitting element 1, and 3 is a function to fix the condenser lens. , and l is a light emitting element.
第１図（ロ）において４は基板、５．６はそれぞれ異な
る発光波長を持つ発光素子Ａ、発光素子Ｂである。In FIG. 1(b), 4 is a substrate, and 5.6 is a light-emitting element A and a light-emitting element B, each having a different emission wavelength.
第１図（Ｃ）において７は、本発明におけるＬＥＤアレ
イ光源の照度分布、８は従来のＬＥＤアレイ光源の照度
分布、そして２０はＬＥＤアレイ光源である。In FIG. 1(C), 7 is the illuminance distribution of the LED array light source in the present invention, 8 is the illuminance distribution of the conventional LED array light source, and 20 is the LED array light source.
また第１図（ａ）、 （ｂ）においてｇｏ、ｚ、は、隣
接する発光素子の間隔を表すもので、第１図（ａ）、
（ｂ）において、
１０＞１゜
である。In addition, go and z in FIGS. 1(a) and 1(b) represent the distance between adjacent light emitting elements;
In (b), 10>1°.
以上のように構成されたＬＥＤアレイ光源において以下
その動作について説明する。The operation of the LED array light source configured as described above will be described below.
第１図（ａ）、 （ｂ）において、基Ｆｉ４上に配列さ
れた発光素子Ａ５、及び発光素子Ｂ６は、それぞれ外部
からの電圧印加等により発光を行なう５発光素子Ａ５、
又は発光素子Ｂ６より゛発光された光はホルダー３によ
って固定された集光レンズ２によって集光され、例えば
画像読み取り装置であれば原稿台の原稿を照明する。In FIGS. 1(a) and 1(b), a light emitting element A5 and a light emitting element B6 arranged on a group Fi4 are five light emitting elements A5 and B6, respectively, which emit light by external voltage application, etc.
Alternatively, the light emitted from the light emitting element B6 is condensed by the condenser lens 2 fixed by the holder 3, and illuminates the document on the document table in the case of an image reading device, for example.
このとき、従来のＬＥＤアレイ光源であれば、第１図（
Ｃ）の８に示すようにＬＥＤアレイ光源の両端部は照明
が低下してしまい、均一な照度分布を得ようとした場合
、実際のＬＥＤアレイ光源の長さは、必要とする照度分
布の長さよりずっと長いものになってしまう。At this time, if the conventional LED array light source is used, as shown in Fig. 1 (
As shown in C) 8, the illumination is reduced at both ends of the LED array light source, and when trying to obtain a uniform illuminance distribution, the actual length of the LED array light source is the length of the required illuminance distribution. It ends up being much longer than it is.
しかしながら、本発明のＬＥＤアレイ光源であれば、Ｌ
ＥＤアレイ光源の両端における発光素子の間隔が中心部
と比較して短いのでＬＥＤアレイ光源両端部の照度低下
を第１図（Ｃ）に示されるように、従来のＬＥＤアレイ
光源に比して小さくすることが可能になる。なお第１図
（Ｃ）において、７゜８に示される照度分布はＬＥＤア
レイ光源２０の各位置に対応している。However, with the LED array light source of the present invention, L
Since the distance between the light emitting elements at both ends of the ED array light source is shorter than that at the center, the decrease in illuminance at both ends of the LED array light source is smaller than that of a conventional LED array light source, as shown in Figure 1 (C). It becomes possible to do so. In FIG. 1C, the illuminance distribution shown at 7° 8 corresponds to each position of the LED array light source 20.
なお、本実施例においては、発光素子の間隔を両端部３
チンブずつだけが中心部に対して狭くなるように配置し
であるが、この配置以外の構成でもよい。Note that in this example, the distance between the light emitting elements is set at both ends 3.
Although the arrangement is such that only the chins are narrower with respect to the center, other arrangements may be possible.
発明の効果
以上のように本発明は、ＬＥＤアレイ光源において、前
記ＬＥＤアレイ光源の両端部と中心部において隣接する
発光素子の間隔が異なるように配置することによりＬＥ
Ｄアレイ光源の両端部の照度差を小さくし、中心部と両
端部の照度分布を一定にし、均一な照度範囲の広いＬＥ
Ｄアレイ光源をあたえるものであり、その結果、本発明
のＬＥＤアレイ光源を画像読み取り装置等の光源にもち
いた場合画像読み取り装置の小型化が可能になる。Effects of the Invention As described above, the present invention provides an LED array light source by arranging adjacent light emitting elements at different intervals at both ends and at the center of the LED array light source.
LE that reduces the difference in illuminance between both ends of the D array light source, makes the illuminance distribution constant between the center and both ends, and has a wide uniform illuminance range.
As a result, when the LED array light source of the present invention is used as a light source for an image reading device, it becomes possible to downsize the image reading device.
第１図（ａ）は本発明の一実施例におけるＬＥＤアレイ
光源の構成を示す断面図、第１図（ｂ）は本発明のＬＥ
Ｄアレイ光源の基板上の発光素子の配列を示す斜視図、
第１図（Ｃ）は従来のＬＥＤアレイ光源と本発明のＬＥ
Ｄアレイ光源の照度分布の差を示すグラフ、第２図（ａ
ｌは従来のＬＥＤアレイ光源の構成を示す断面図、第２
図（ｂ）は従来のＬＥＤアレイ光源の基板上の発光素子
の配列を示す斜視図である。
１・・・・・・発光素子、２・・・・・・集光レンズ、
３・・・・・・ホルダー、４・・・・・・基板、５・・
・・・・発光素子Ａ、６・・・・・・発光素子Ｂ、７・
・・・・・本発明によるＬＥＤアレイ光源の照度分布、
８・・・・・・従来のＬＥＤアレイ光源の照度分布、２
０・・・・・・ＬＥＤアレイ光源。
代理人の氏名 弁理士 中尾敏男 ほか１名第１図
（ａ）
ａソＬＥＤアレイ光温
宵２図
（α］FIG. 1(a) is a sectional view showing the configuration of an LED array light source in an embodiment of the present invention, and FIG.
A perspective view showing an arrangement of light emitting elements on a substrate of a D array light source,
FIG. 1(C) shows a conventional LED array light source and an LED of the present invention.
Graph showing the difference in illuminance distribution of the D array light source, Figure 2 (a
1 is a cross-sectional view showing the configuration of a conventional LED array light source;
Figure (b) is a perspective view showing the arrangement of light emitting elements on a substrate of a conventional LED array light source. 1... Light emitting element, 2... Condensing lens,
3... Holder, 4... Board, 5...
...Light emitting element A, 6... Light emitting element B, 7.
...Illuminance distribution of the LED array light source according to the present invention,
8...Illuminance distribution of conventional LED array light source, 2
0...LED array light source. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1
(a) Figure 2 of a LED array light temperature (α)
Claims (1)
配列された基板と、前記発光素子によって発光された光
を集光する働きをもつ集光レンズと前記集光レンズを固
定する役割を持つホルダーとを具備したＬＥＤアレイ光
源であって、前記発光素子の配置間隔を異なるように配
置したことを特徴とするＬＥＤアレイ光源。It includes a substrate on which at least a plurality of types of light emitting elements having different emission wavelengths are arranged, a condensing lens having a function of condensing light emitted by the light emitting elements, and a holder having a role of fixing the condensing lens. An LED array light source characterized in that the light emitting elements are arranged at different intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63126429A JPH01296764A (en) | 1988-05-24 | 1988-05-24 | Led array light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63126429A JPH01296764A (en) | 1988-05-24 | 1988-05-24 | Led array light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01296764A true JPH01296764A (en) | 1989-11-30 |
Family
ID=14934972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63126429A Pending JPH01296764A (en) | 1988-05-24 | 1988-05-24 | Led array light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01296764A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005095887A1 (en) * | 2004-03-31 | 2005-10-13 | Brother Kogyo Kabushiki Kaisha | Projector and three-dimensional shape detecting device |
| JP2008116450A (en) * | 1997-05-23 | 2008-05-22 | Becton Dickinson & Co | Light source apparatus, light source and optical system associated with automated microbiological test |
-
1988
- 1988-05-24 JP JP63126429A patent/JPH01296764A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008116450A (en) * | 1997-05-23 | 2008-05-22 | Becton Dickinson & Co | Light source apparatus, light source and optical system associated with automated microbiological test |
| JP2010044085A (en) * | 1997-05-23 | 2010-02-25 | Becton Dickinson & Co | Optical system concerning automated microbiological testing |
| WO2005095887A1 (en) * | 2004-03-31 | 2005-10-13 | Brother Kogyo Kabushiki Kaisha | Projector and three-dimensional shape detecting device |
| JP2005291839A (en) * | 2004-03-31 | 2005-10-20 | Brother Ind Ltd | Projecting device and three-dimensional shape detection device |
| US7845807B2 (en) | 2004-03-31 | 2010-12-07 | Brother Kogyo Kabushiki Kaisha | Projection apparatus and three-dimensional-shape detection apparatus |
| JP4734843B2 (en) * | 2004-03-31 | 2011-07-27 | ブラザー工業株式会社 | 3D shape detector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7215448B2 (en) | Image reading apparatus | |
| DE60219404D1 (en) | lighting device | |
| JPH09214675A (en) | Image reader and light source unit | |
| JPH01296764A (en) | Led array light source | |
| JPH03113961A (en) | Picture reader | |
| JPS63155782A (en) | Light source device | |
| JP4017391B2 (en) | Planar light source device and image reading device | |
| JPH073886B2 (en) | Lighting method by light emitting diode | |
| KR920001414A (en) | LED light emitting device | |
| JP2763839B2 (en) | Image scanner | |
| JPH05199367A (en) | Light source device | |
| US6168296B1 (en) | Lighting unit for reading marks | |
| JPS63182963A (en) | Led array light source | |
| JP2000270174A (en) | Image reader | |
| JPH01265661A (en) | Solid-state image pickup device | |
| JPS62125773A (en) | Led array light source | |
| ATE102325T1 (en) | LIGHTING DEVICE FOR A CYLINDRICAL LIGHT SOURCE. | |
| JP2539823B2 (en) | Lighting equipment | |
| DE59010160D1 (en) | Illuminated switch | |
| JPH05189592A (en) | Bar code scanner | |
| JPH04311149A (en) | Image illuminating device, image reader and converging element | |
| JPH04245765A (en) | Image reading light source and image reader | |
| JPH08307610A (en) | Image reader | |
| JPH01289367A (en) | Light source unit for color original reader | |
| JPS60150850U (en) | light source device |