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
- Led Device Packages (AREA)
- Led Devices (AREA)
- Character Input (AREA)
- 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 |
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