JPH073886B2 - Lighting method by light emitting diode - Google Patents
Lighting method by light emitting diodeInfo
- Publication number
- JPH073886B2 JPH073886B2 JP17034484A JP17034484A JPH073886B2 JP H073886 B2 JPH073886 B2 JP H073886B2 JP 17034484 A JP17034484 A JP 17034484A JP 17034484 A JP17034484 A JP 17034484A JP H073886 B2 JPH073886 B2 JP H073886B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- emitting diodes
- emitting diode
- light amount
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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装置等において、原稿を読取る一
元ラインセンサの出力が平坦になるようにした照明方式
に関するものである。Description: TECHNICAL FIELD The present invention relates to an illumination system in a facsimile apparatus or the like in which an output of a unitary line sensor for reading an original is flat.
（従来の技術） 従来のファクシミリ装置等における読取部の構成を第５
図，第６図に示す。図において第５図は側面図、第６図
はその平面図で読取られる原稿１を蛍光灯２で照明し、
その反射光をレンズ３を通過してラインセンサ４に結像
し、これを読取り、センサ基板５からセンサ出力を得る
ようにしたもので、蛍光灯２は点灯器（図示せず）によ
り発振・駆動されている。(Prior Art) The configuration of the reading unit in a conventional facsimile apparatus is
Figure and Figure 6 show. In FIG. 5, FIG. 5 is a side view, and FIG. 6 is a plan view showing an original 1 illuminated by a fluorescent lamp 2.
The reflected light passes through the lens 3 to form an image on the line sensor 4, which is read and a sensor output is obtained from the sensor substrate 5. The fluorescent lamp 2 is oscillated by a lighting device (not shown). Being driven.
（発明が解決しようとする問題点） しかしながら、ラインセンサ４の読取幅Ｃ−Ｂ方向（主
走査方向）出力は一般に蛍光灯２の光量分布及びレンズ
３の画角θによる光量分布により、第７図，第８図に示
すようになる。即ち第７図において蛍光灯２が新品の場
合、その全長（Ｄ−Ｅ）における光量分布ａは全長の60
〜70％が平坦、それ以上の両端で落込む。しかし蛍光灯
２が経時変化後の光量分布ｂは全体の光量が落込むと共
に、両端の落込みが著しい。(Problems to be Solved by the Invention) However, the reading width CB direction (main scanning direction) output of the line sensor 4 is generally determined by the light amount distribution of the fluorescent lamp 2 and the light amount distribution depending on the angle of view θ of the lens 3. As shown in FIG. 8 and FIG. That is, in FIG. 7, when the fluorescent lamp 2 is new, the light amount distribution a in the entire length (D-E) is 60
~ 70% flat, drop at both ends. However, in the light amount distribution b after the fluorescent lamp 2 has changed over time, the entire light amount drops and both ends drop significantly.
次に、レンズ３を通過する光量としては第８図に示すよ
うに、読取られる原稿１の読取幅Ｂ−Ｃのレンズ３の位
置とから決まる画角θにより、画角θの小さい場合の光
量分布ｃは、画角θの大きい場合の光量分布ｄに比べ両
端部の光量は中央部に対し落込みが少ない。いわゆるco
s4θ則があてはまる。Next, as shown in FIG. 8, the amount of light passing through the lens 3 is the amount of light when the angle of view θ is small due to the angle of view θ determined by the position of the lens 3 of the reading width BC of the document 1 to be read. In the distribution c, compared to the light amount distribution d in the case where the angle of view θ is large, the light amounts at both ends drop less than the central part. So-called co
The s 4 θ rule applies.
新しい蛍光灯を用いてレンズ３を通過した光量分布は第
９図のｅに示すように第７図の光量分布ａと第８図の光
量分布ｃとを加えた形となる。この出力をレンズ３の前
に適当な形状にしたシェーディングプレート６をセット
することによって第10図に示すように平坦な光量分布ｆ
（ラインセンサ４で受光する光量）にする。The light amount distribution that has passed through the lens 3 by using a new fluorescent lamp has a form in which the light amount distribution a in FIG. 7 and the light amount distribution c in FIG. 8 are added, as shown in e of FIG. By setting a shading plate 6 having an appropriate shape in front of the lens 3 for this output, as shown in FIG.
(The amount of light received by the line sensor 4).
従って蛍光灯２を用いてレンズ３でラインセンサ４に結
像する方法においては、上述したように蛍光灯２の全長
の光量分布が不均一である。その上蛍光灯２が経時変化
して古くなった場合には、この不均一さは拡大する。Therefore, in the method of forming an image on the line sensor 4 with the lens 3 using the fluorescent lamp 2, the light amount distribution of the entire length of the fluorescent lamp 2 is not uniform as described above. Moreover, when the fluorescent lamp 2 is aged and aged, this non-uniformity increases.
このため、ラインセンサ４に結像する光量を均一化する
ための方法としてレンズ３の前で光量分布の凸形部を一
部遮蔽するシェーディングプレート６を必要とする。ま
た、シェーディングプレート６の代わりに電気的処理を
行なう方法（図示せず）や、発光ダイオードを一列に適
当なピッチで配置し、これをｎ等分して分割した部分ご
とに、発光ダイオードに直列に接続する抵抗の抵抗値を
変えて光量分布を平坦とする方法もある。For this reason, the shading plate 6 that partially shields the convex portion of the light amount distribution in front of the lens 3 is required as a method for making the light amount imaged on the line sensor 4 uniform. Also, instead of the shading plate 6, a method of performing electrical treatment (not shown), or by arranging the light emitting diodes in a row at an appropriate pitch and dividing the light emitting diode into n equal parts are connected in series to the light emitting diode. There is also a method of making the light amount distribution flat by changing the resistance value of the resistor connected to.
このようにセンサ出力を平坦にするためシェーディング
プレート６や電気的処理をするための構成や調整が複雑
になるとともに、発光ダイオードを用いたものは各部分
ごとの電流が異なるため、経時変化により性能が劣化す
るものが生じるなどの問題点があった。As described above, in order to make the sensor output flat, the shading plate 6 and the configuration and adjustment for electrical processing become complicated, and since the current using each part of the light emitting diode is different, the performance changes with time. However, there was a problem that some deteriorate.
（問題点を解決するための手段） 本発明は蛍光灯の代りに半永久的な寿命を有する発光ダ
イオードを多数使用し、原稿の読取りに必要な照明幅の
全長をｎ個に不等分割し、かつ、分割した部分ごとに直
列に接続する発光ダイオードの個数と、そこに接続する
抵抗の値を変え、各部分の光量を変えてレンズ３を通過
させ、ラインセンサ４に結像した光量分布が平坦となる
ようにしたものである。(Means for Solving the Problems) The present invention uses a large number of light-emitting diodes having a semi-permanent life instead of a fluorescent lamp, and unevenly divides the total length of the illumination width required for reading a document into n pieces, Moreover, the number of light-emitting diodes connected in series and the value of the resistance connected to each of the divided parts are changed, the light amount of each part is changed to pass through the lens 3, and the light amount distribution imaged on the line sensor 4 is changed. It is designed to be flat.
（作用） 本発明は上記のように構成したので、発光ダイオードの
発光光量がレンズ３を通してラインセンサ４上に結像す
る光量分布を前記した逆cos4θ則の曲線に合うよう、即
ち両端の分割部分には発光量が大きくなるよう発光ダイ
オードの数を多くするか、電流値を大きくすることによ
ってレンズ３を介してラインセンサ４に結像する光量分
布を平坦にすることができる。(Operation) Since the present invention is configured as described above, the amount of light emitted from the light emitting diode is adjusted so that the light amount distribution imaged on the line sensor 4 through the lens 3 matches the curve of the inverse cos 4 θ rule, that is, at both ends. By increasing the number of light emitting diodes or increasing the current value in the divided portion so that the light emission amount becomes large, the light amount distribution imaged on the line sensor 4 via the lens 3 can be made flat.
（実施例） 第１図は発光ダイオードによる照明方式の一例の説明図
であり、第２図はその回路図である。(Example) FIG. 1 is an explanatory view of an example of an illumination system using a light emitting diode, and FIG. 2 is a circuit diagram thereof.
第１図において照明に必要な全長より長めのベース21に 個の発光ダイオード23が一直線上に適当なピッチで配置
されている。この必要照明幅をｎ個に分割し、その分割
された部分のmi＝ｍ個の発光ダイオード23（D1〜Dm）に
対し、抵抗24（R1〜Rn）の１個を付加して、これらを直
列に接続し、かつその各々は電源25に対し並列接続され
る。これを適当位置に結像させるシリンドリカルレンズ
22が全長に渡って取付いている。In Fig. 1, the base 21 is longer than the total length required for lighting. The light emitting diodes 23 are arranged on a straight line at an appropriate pitch. This required illumination width is divided into n pieces, and one piece of a resistor 24 (R 1 to R n ) is added to the divided light emitting diodes 23 (D 1 to D m ) of m i = m. Then, these are connected in series, and each of them is connected in parallel to the power supply 25. Cylindrical lens that images this at an appropriate position
22 is attached over the entire length.
この場合、発光ダイオード23（D1〜Dm）の発光光量がレ
ンズ３を通過してラインセンサ４に結像した時、その光
量分布が平坦になるようにする。即ち第３図に示すよう
に逆cos4θ則の曲線ｇに合うように、各々分割されたｍ
個の発光ダイオード23（D1〜Dm）に接続した抵抗24（R1
〜Rn）を適切な抵抗値にして、その光量分布を逆cos4θ
則に近似したものにする。なお発光ダイオードの光量
は、それに流れる電流にほぼ比例するので直列に接続す
る抵抗の値を変えることで調整できる。In this case, when the amount of light emitted from the light emitting diodes 23 (D 1 to D m ) passes through the lens 3 and forms an image on the line sensor 4, the light amount distribution is made flat. That is, as shown in FIG. 3, m divided respectively to fit the curve g of the inverse cos 4 θ rule.
Resistor 24 (R 1 connected to one light emitting diode 23 (D 1 to D m ).
~ R n ) with an appropriate resistance value and the light intensity distribution is inversed by cos 4 θ
Make it close to the law. Since the light quantity of the light emitting diode is almost proportional to the current flowing therethrough, it can be adjusted by changing the value of the resistor connected in series.
以上の説明は、照明幅をｎ分割し、その各々にｍ個の発
光ダイオードと１個の異なる抵抗値の抵抗をセットして
配置した場合についてである。The above description is for a case where the illumination width is divided into n, and m light emitting diodes and one resistor having a different resistance value are set and arranged in each.
本発明は、前記第１図に示す説明図の照明幅（Ｇ−Ｈ）
をｎ個に不等分割し、かつ、分割した各部分に配分する
発光ダイオードの個数miを照明幅の中心を対称に左右同
一とするとともに、第４図（ａ），（ｂ）に示すように
光量分布ｈが逆cos4θ則に合うように分割した各部分の
発光ダイオードの個数を変えて光量を調整するようにし
たものである。The present invention shows the illumination width (GH) of the explanatory view shown in FIG.
Is unequally divided into n, and the number of light emitting diodes m i distributed to each divided portion is the same symmetrically with respect to the center of the illumination width, and is shown in FIGS. 4 (a) and 4 (b). As described above, the light quantity is adjusted by changing the number of light emitting diodes in each part divided so that the light quantity distribution h conforms to the inverse cos 4 θ rule.
この場合m1＝mn，m2＝mn-1，…であるが、m1≠m2，m2≠
m3…である。In this case, m 1 = m n , m 2 = m n-1 , ..., But m 1 ≠ m 2 , m 2 ≠
m 3 ...
例えば、第４図（ａ）は両端部の直列に接続するダイオ
ードの個数を多く、中央は少なくするが、それに接続す
る抵抗はその光量分布が曲線ｈになるよう接続する。第
４図（ｂ）はその反対の場合である。For example, in FIG. 4 (a), the number of diodes connected in series at both ends is large and the number at the center is small, but the resistors connected to them are connected so that the light amount distribution thereof becomes a curve h. FIG. 4 (b) shows the opposite case.
なお、発光ダイオードの発光色がオレンジのものが出力
が高く、実用的であるが用途に応じて例えば赤色文字を
読み取らせない場合は赤色のものを用いる。また、種々
組合せて混合し、白色光を得ることもできる。It should be noted that when the light emitting diode emits orange light, the output is high and it is practical, but if the red character is not read depending on the application, the red one is used. In addition, white light can be obtained by combining various types and mixing.
（発明の効果） 以上詳細に説明したように本発明を照明として蛍光灯の
代りに発光ダイオードを使用するので半永久的で経時劣
化がなく、また機械的、電気的シェーディングを不用と
するので単純で品質の良い光学読取系を構成することが
できる。したがって本発明はファクシミリのみならずイ
メージリーダ，複写機の光源としても利用できる。(Effects of the Invention) As described in detail above, since the present invention uses a light emitting diode instead of a fluorescent lamp as illumination, it is semi-permanent and does not deteriorate over time, and mechanical and electrical shading are unnecessary, so that it is simple. A high-quality optical reading system can be constructed. Therefore, the present invention can be used not only as a facsimile but also as a light source for an image reader and a copying machine.
【図面の簡単な説明】 第１図は発光ダイオードによる照明方式の一例の説明図
で、（ａ）は正面図、（ｂ）は側面図、第２図は同じく
その回路図、第３図は同じくその光量分布説明図、第４
図（ａ）、（ｂ）は本発明の実施例の光量分布説明図、
第５図は従来の照明方式を示す読取部の構成を示す側面
図、第６図は同じくその平面図、第７図〜第10図は同じ
くその動作説明図である。 １……原稿、２……蛍光灯、３……レンズ、４……ライ
ンセンサ、５……センサ基板、６……シェーディングプ
レート、21……ベース、22……シリンドリカルレンズ、
23……発光ダイオード、24……抵抗。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an example of a lighting system using a light emitting diode. (A) is a front view, (b) is a side view, FIG. 2 is the same circuit diagram, and FIG. 3 is Similarly, an explanatory view of the light quantity distribution, No. 4
(A) and (b) are explanatory views of the light amount distribution of the embodiment of the present invention,
FIG. 5 is a side view showing the configuration of a reading unit showing a conventional illumination system, FIG. 6 is a plan view thereof, and FIGS. 7 to 10 are operation explanatory diagrams thereof. 1 ... manuscript, 2 ... fluorescent lamp, 3 ... lens, 4 ... line sensor, 5 ... sensor substrate, 6 ... shading plate, 21 ... base, 22 ... cylindrical lens,
23 …… light emitting diode, 24 …… resistance.
Claims (1)
置した照明方法において、原稿の読取りに必要な照明幅
をｎ個に不等分割し、かつ分割された発光ダイオードの
個数が照明幅の中心を対称に左右同一で、またその個数
が中心より遠ざかるに従って増大又は減少するよう配分
し、それぞれに分割された発光ダイオードと抵抗とを直
列に接続し、かつ、そのｎ個の直列回路を並列点灯し、
前記配分された発光ダイオードの個数によりレンズを通
過した光量分布が平坦になるよう、それぞれ直列回路の
光量を変化せしめることを特徴とする発光ダイオードに
よる照明方式。1. A lighting method in which light-emitting diodes are arranged in a line at an appropriate pitch, and an illumination width required for reading a document is unevenly divided into n pieces, and the number of the divided light-emitting diodes is the center of the illumination width. Are symmetrically distributed to the left and right, and the number is distributed so as to increase or decrease as the distance from the center increases, and the divided light emitting diodes and resistors are connected in series, and the n series circuits are lit in parallel. Then
An illumination system using light emitting diodes, wherein the light amount of each series circuit is changed so that the light amount distribution passing through the lens becomes flat depending on the number of the distributed light emitting diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17034484A JPH073886B2 (en) | 1984-08-17 | 1984-08-17 | Lighting method by light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17034484A JPH073886B2 (en) | 1984-08-17 | 1984-08-17 | Lighting method by light emitting diode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6148982A JPS6148982A (en) | 1986-03-10 |
| JPH073886B2 true JPH073886B2 (en) | 1995-01-18 |
Family
ID=15903185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17034484A Expired - Lifetime JPH073886B2 (en) | 1984-08-17 | 1984-08-17 | Lighting method by light emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073886B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0749818Y2 (en) * | 1986-03-18 | 1995-11-13 | 三洋電機株式会社 | Linear light source |
| JPS62171254U (en) * | 1986-04-18 | 1987-10-30 | ||
| JPS62171253U (en) * | 1986-04-18 | 1987-10-30 | ||
| JPH0635569Y2 (en) * | 1986-09-19 | 1994-09-14 | 富士通株式会社 | Document reader |
| JP2549205B2 (en) * | 1990-12-26 | 1996-10-30 | ローム株式会社 | LED array light source |
| US5278432A (en) * | 1992-08-27 | 1994-01-11 | Quantam Devices, Inc. | Apparatus for providing radiant energy |
| US6305284B1 (en) | 1997-08-15 | 2001-10-23 | Asahi Kasei Kabushiki Kaisha | Method and apparatus for making an offset printing plate |
| JP2008180842A (en) * | 2007-01-24 | 2008-08-07 | Ricoh Co Ltd | Illuminating device, image reading apparatus, and image forming apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5570168A (en) * | 1978-11-22 | 1980-05-27 | Nec Corp | Light source for facsimile |
| JPS587363U (en) * | 1981-07-06 | 1983-01-18 | 日本電信電話株式会社 | Photoelectric reading light source device |
-
1984
- 1984-08-17 JP JP17034484A patent/JPH073886B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6148982A (en) | 1986-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |