JP2876696B2 - Color document reader - Google Patents
Color document readerInfo
- Publication number
- JP2876696B2 JP2876696B2 JP2074148A JP7414890A JP2876696B2 JP 2876696 B2 JP2876696 B2 JP 2876696B2 JP 2074148 A JP2074148 A JP 2074148A JP 7414890 A JP7414890 A JP 7414890A JP 2876696 B2 JP2876696 B2 JP 2876696B2
- Authority
- JP
- Japan
- Prior art keywords
- light sources
- reading
- light source
- color
- color document
- 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 - Fee Related
Links
Landscapes
- Facsimile Scanning Arrangements (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は蓄積タイプのイメージセンサを用いたカラー
原稿読取装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color document reading apparatus using an accumulation type image sensor.
[従来の技術] 従来の複数光源を用いたカラー原稿読取装置は、第5,
6図に示すように複数の光源を点灯させる際全て同じタ
イミングにオン、オフさせていた。[Prior Art] A conventional color document reading apparatus using a plurality of light sources is described in the fifth,
As shown in FIG. 6, when turning on a plurality of light sources, they were all turned on and off at the same timing.
[発明が解決しようとする課題] このため第5、6図eに示したように比較的短期間内
にランプ電源電流が集中し、これを補うために大容量の
コンデンサや大電流素子を電源に使用するなど、心要以
上に大きな容量の電源を使用しなければならないという
課題を有していた。[Problems to be Solved by the Invention] As shown in FIGS. 5 and 6e, the lamp power supply current concentrates in a relatively short period of time, and a large-capacity capacitor or a large current element is supplied to compensate for this. For example, there is a problem that a power supply having a larger capacity than necessary is required.
そこで、本発明は従来のこのような課題を解決するも
ので、適切な容量の電源で充分なモノクロ読み取りある
いはカラー読み取りを行うことができるカラー原稿読み
取り装置を提供することを目的とする。Therefore, an object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a color document reading apparatus capable of performing sufficient monochrome reading or color reading with a power supply having an appropriate capacity.
[課題を解決するための手段] 本発明のカラー原稿読取装置は、異なる発光波長をも
つ複数の光源を、蓄積タイプのイメージラインセンサの
読み取りタイミングに同期点灯させて、原稿画像を読み
取るカラー原稿読取装置において、一蓄積期間に異なる
発光波長をもつ複数の光源を全て点灯させモノクロ読み
取りをする際に、少なくとも一つの光源の点灯期間を他
の光源の点灯期間とずらして点灯することを特徴とす
る。また、一蓄積期間に異なる発光波長をもつ複数の光
源のうち二つの光源を点灯させ、補色でカラー読み取り
をする際に、一つの光源の点灯期間を他の光源の点灯期
間とずらして点灯することを特徴とする。さらに、異な
る発光波長をもつ複数の光源が赤色LED、青色LEDおよび
緑色LEDであることを特徴とする。Means for Solving the Problems A color document reading apparatus according to the present invention reads a document image by lighting a plurality of light sources having different emission wavelengths in synchronization with the reading timing of an accumulation type image line sensor. In the apparatus, when performing monochrome reading by turning on a plurality of light sources having different emission wavelengths in one accumulation period, the lighting period of at least one light source is shifted from the lighting periods of the other light sources, and the lighting is performed. . In addition, two light sources among a plurality of light sources having different emission wavelengths are turned on in one accumulation period, and when performing color reading with a complementary color, the lighting period of one light source is shifted from the lighting period of another light source to be turned on. It is characterized by the following. Further, the plurality of light sources having different emission wavelengths are a red LED, a blue LED, and a green LED.
[作用] 上記のごとく光源を点灯させると、短期間に必要とさ
れる電流が減り、それに応じた容量の電源素子が使え、
適切な電源容量に収めることができる。また電源電流の
減少により素子の寿命がのび、装置全体の信頼性も増す
ものである。[Operation] When the light source is turned on as described above, the current required in a short time is reduced, and a power supply element having a capacity corresponding to the current can be used.
It can be stored in an appropriate power supply capacity. In addition, the life of the device is prolonged due to the decrease in the power supply current, and the reliability of the entire device is increased.
[実施例] 以下に本発明を実施例に基づいて説明する。第1図は
本発明のモノクロ読み取りにかかる一実施例で、a、
b、c、d、eは緑、赤、青のLED光源の点灯時間とイ
メージセンサ(例えばCCDラインセンサ)出力およびLED
電源電流の関係を示す図である。第2図は本発明に用い
るカラー原稿読取装置の読取部の例で、光源2、3、4
により照らされた原稿ガラス1上におかれた原稿が、等
倍レンズ5により密着イメージセンサ6上に結像し、そ
の画像情報が読取部を移動しながら順次に読み出され、
原稿面の画像をすべて読み取るものである。EXAMPLES Hereinafter, the present invention will be described based on examples. FIG. 1 shows an embodiment relating to monochrome reading of the present invention.
b, c, d, and e are the lighting times of the green, red, and blue LED light sources, the output of the image sensor (for example, a CCD line sensor), and the LEDs.
FIG. 3 is a diagram illustrating a relationship between power supply currents. FIG. 2 shows an example of a reading unit of a color document reading apparatus used in the present invention, and light sources 2, 3, and 4 are shown.
The original placed on the original glass 1 illuminated by the imaging device forms an image on the contact image sensor 6 by the equal-magnification lens 5, and the image information is sequentially read while moving the reading unit.
It reads all images on the document surface.
尚、第1図は3本の光源を一蓄積期間内に点灯する時
の例で、全ての光源の点灯タイミングをずらしているた
め、光源電源電流の最大値は各1本毎の光源電源電流の
最大値と等しい。これは全ての光源を同時に点灯した場
合よりはるかに少ない電流値となる 第3図は本発明のカラー読み取りにかかる一実施例で、
緑、赤、青の補色イエロー、シアン、マゼンタで読み取
る場合である。この例でも、光源電源電流の最大値は各
光源1本毎の最大値となる(従来例を示す第6図参
照)。FIG. 1 shows an example in which three light sources are turned on within one accumulation period. Since the lighting timings of all the light sources are shifted, the maximum value of the light source power source current is one for each light source. Is equal to the maximum of This is a much lower current value than when all the light sources are turned on at the same time. FIG. 3 is an embodiment relating to color reading of the present invention.
This is a case of reading with complementary colors of green, red, and blue, yellow, cyan, and magenta. Also in this example, the maximum value of the light source power supply current is the maximum value for each light source (see FIG. 6 showing a conventional example).
第4図は本発明のモノクロ読み取りにかかる他の実施
例で、この例では一番電流を心要とする光源のみ、他の
2本の光源と点灯タイミングをずらしているため、電源
にそれほど負担をかけず、センサの読みだし時間のみで
決まる最速時間で読み取りが実現できる。FIG. 4 shows another embodiment relating to the monochrome reading of the present invention. In this example, only the light source that requires the most current is shifted in lighting timing from the other two light sources, so that the load on the power source is not so large. The reading can be realized in the fastest time determined only by the reading time of the sensor without applying any time.
[発明の効果] 以上述べたように本発明によれば、上記のごとく光源
を点灯させることにより、短期間に必要とされる電流が
減り、それに応じた容量の電源素子が使え、適切な電源
容量に収めることができる。また電源電流の減少により
素子の寿命がのび、装置全体の信頼性も増すという効果
を有する。[Effects of the Invention] As described above, according to the present invention, by turning on the light source as described above, the current required in a short period of time is reduced, and a power supply element having a capacity corresponding thereto can be used. Can fit in capacity. In addition, there is an effect that the life of the element is prolonged due to the decrease in the power supply current, and the reliability of the entire device is increased.
第1図は本発明のモノクロ読み取りにおける光源の点灯
タイミングとイメージセンサ出力および光源電源電流の
関係図。 第2図は本発明に用いるカラー原稿読取装置の読取部の
断面図。 第3図は本発明のカラー読み取りにかかる一実施例を示
す光源の点灯タイミングとイメージセンサ出力および光
源電源電流の関係図。 第4図は本発明のモノクロ読み取りにかかる他の実施例
を示す光源の点灯タイミングとイメージセンサ出力およ
び光源電源電流の関係図。 第5、6図は従来の光源の点灯タイミングとイメージセ
ンサ出力および光源電源電流の関係図。 1……原稿ガラス 2……赤色LED 3……青色LED 4……縁色LED 5……等倍レンズ 6……密着タイプイメージセンサFIG. 1 is a diagram showing the relationship between the light source lighting timing, the image sensor output, and the light source power supply current in monochrome reading according to the present invention. FIG. 2 is a sectional view of a reading section of the color document reading apparatus used in the present invention. FIG. 3 is a diagram showing the relationship between the lighting timing of the light source, the output of the image sensor, and the power source current of the light source, showing one embodiment of the color reading of the present invention. FIG. 4 is a diagram showing the relationship between the lighting timing of the light source, the image sensor output, and the light source power supply current, showing another embodiment of the monochrome reading of the present invention. 5 and 6 are diagrams showing the relationship between the lighting timing of the conventional light source, the output of the image sensor, and the light source power supply current. 1 ... Original glass 2 ... Red LED 3 ... Blue LED 4 ... Edge LED 5 ... 1: 1 lens 6 ... Contact image sensor
Claims (3)
タイプのイメージラインセンサの読み取りタイミングに
同期点灯させて、原稿画像を読み取るカラー原稿読取装
置において、 一蓄積期間に前記異なる発光波長をもつ複数の光源を全
て点灯させモノクロ読み取りをする際に、少なくとも一
つの光源の点灯期間を他の光源の点灯期間とずらして点
灯することを特徴とするカラー原稿読取装置。1. A color document reading apparatus for reading a document image by illuminating a plurality of light sources having different light emission wavelengths in synchronization with a reading timing of a storage type image line sensor. A color document reading apparatus characterized in that when performing monochrome reading by turning on all of the plurality of light sources, the lighting period of at least one light source is shifted from the lighting periods of the other light sources, and the color document reading apparatus is turned on.
タイプのイメージラインセンサの読み取りタイミングに
同期点灯させて、原稿画像を読み取るカラー原稿読取装
置において、 一蓄積期間に前記異なる発光波長をもつ複数の光源のう
ち二つの光源を点灯させ、補色でカラー読み取りをする
際に、一つの光源の点灯期間を他の光源の点灯期間とず
らして点灯することを特徴とするカラー原稿読取装置。2. A color document reading apparatus for reading a document image by illuminating a plurality of light sources having different light emission wavelengths in synchronization with a reading timing of a storage type image line sensor. A color document reading apparatus characterized in that when two of the plurality of light sources are turned on to perform color reading with a complementary color, the lighting period of one light source is shifted from the lighting period of the other light source to turn on.
色LED、青色LEDおよび緑色LEDである請求項1あるいは
請求項2に記載のカラー原稿読取装置。3. The color document reading apparatus according to claim 1, wherein the plurality of light sources having different emission wavelengths are a red LED, a blue LED, and a green LED.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2074148A JP2876696B2 (en) | 1990-03-24 | 1990-03-24 | Color document reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2074148A JP2876696B2 (en) | 1990-03-24 | 1990-03-24 | Color document reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03274856A JPH03274856A (en) | 1991-12-05 |
JP2876696B2 true JP2876696B2 (en) | 1999-03-31 |
Family
ID=13538789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2074148A Expired - Fee Related JP2876696B2 (en) | 1990-03-24 | 1990-03-24 | Color document reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2876696B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3754738B2 (en) * | 1996-01-17 | 2006-03-15 | キヤノン株式会社 | Image reading device |
JP4989444B2 (en) * | 2007-12-21 | 2012-08-01 | キヤノン株式会社 | Image reading apparatus, multifunction printer apparatus, and image processing method |
-
1990
- 1990-03-24 JP JP2074148A patent/JP2876696B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH03274856A (en) | 1991-12-05 |
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