JPS60254868A - Color original reader - Google Patents

Color original reader

Info

Publication number
JPS60254868A
JPS60254868A JP59109418A JP10941884A JPS60254868A JP S60254868 A JPS60254868 A JP S60254868A JP 59109418 A JP59109418 A JP 59109418A JP 10941884 A JP10941884 A JP 10941884A JP S60254868 A JPS60254868 A JP S60254868A
Authority
JP
Japan
Prior art keywords
frequencies
light
output
light emitting
component
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
Application number
JP59109418A
Other languages
Japanese (ja)
Inventor
Eiji Kamijo
上條 英二
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP59109418A priority Critical patent/JPS60254868A/en
Publication of JPS60254868A publication Critical patent/JPS60254868A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To shorten a readout time by turning on intermittently light sources which have different light emission wavelength at individual frequencies and discriminating the output of a photodetector by band-pass filters corresponding to the on-off frequencies. CONSTITUTION:Light emitting diodes Lr, Lg, and Lb having light emission wavelength corresponding to the three primary colors are turned on intermittently by power sources 3r, 3g, and 3b with mutually different oscillation frequencies Fr, Fg, and Fb. The signal at the output terminal of the light emitting photodiode has its DC component removed and only the AC component is applied to an operational amplifier OP, whose output signal is applied to band-pass filters FLr, FLg, and FLb which discriminate components of frequencies Fr, Fg, and Fb, thereby obtaining image signals Sr, Sg, and Sb corresponding to red, green, and blue.

Description

【発明の詳細な説明】 [技術分野] 本発明は、特に原稿画像のカラー情報を読み取るのに好
適なカラー原稿読取装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a color document reading device particularly suitable for reading color information of a document image.

[従来技術] 原稿画像のカラー情報を読み取るカラー原稿読取装置は
、原稿からの反射光をダイクロイックミラーで色成分に
分解し、そ九ぞれラインイメージセンサ等の受光素子で
光電変換するという複雑な構成をもっていた、。
[Prior Art] A color document reading device that reads color information from a document image uses a complex process in which light reflected from the document is separated into color components using a dichroic mirror, and each component is photoelectrically converted by a light receiving element such as a line image sensor. It had a structure.

そこで従来、製雪構成を簡単にするために各色成分に対
応した発光波長をもつ複数の光源を順次切換えて点灯し
、受光素子をその切換えに同期してスキャン作動する装
置が提案されている(特開昭58−66465号公報参
照)。
Therefore, in order to simplify the snowmaking configuration, a device has been proposed that sequentially switches and lights up multiple light sources with emission wavelengths corresponding to each color component, and scans the light receiving element in synchronization with the switching ( (See Japanese Patent Application Laid-Open No. 58-66465).

しかしながら、かかる装置では光源を切換える毎に受光
素子をスキャンさせるので、1ラインの画像を読み取る
さい光源の数だけ読取時間がかかり、高速な原稿読取が
できないという不都合を生じていた。
However, in such an apparatus, since the light receiving element is scanned each time the light source is switched, it takes as much time as the number of light sources to read one line of image, resulting in the inconvenience that high-speed document reading is not possible.

[目的] 本発明は、上述した従来技術の欠点を解消するためにな
されたもので、発光波長の異なる複数の光源をそれぞれ
異なる周波数(高周波)で点滅点灯させ、受光素子の出
力を点灯周波数に対応した複数のバンドパスフィルタで
弁別することで各色成分を取り出し、読取時間を大幅に
短縮できるカラー原稿読取装置を提供することを目的と
している。
[Purpose] The present invention has been made to solve the above-mentioned drawbacks of the conventional technology, and it blinks a plurality of light sources with different emission wavelengths at different frequencies (high frequencies), and adjusts the output of the light receiving element to the lighting frequency. It is an object of the present invention to provide a color document reading device that extracts each color component by performing discrimination using a plurality of corresponding band-pass filters, and can significantly shorten the reading time.

[構成コ 以下、添付図面を参照しながら本発明の実施例を詳細に
説明する。
[Configuration] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

第1図は1本発明の一実施例に係る光学系を示している
。この実施例では原稿画像をフルカラーに読み取るもの
とする。
FIG. 1 shows an optical system according to an embodiment of the present invention. In this embodiment, it is assumed that the original image is read in full color.

赤緑青の3原色に対応した発光波長をもつ発光ダイオー
ドLr、Lg、L、bは、読取原稿DPの同一読取線R
Lにその光軸が一致するように配設され、読取線RL上
の画像からの反射光は、レンズ1を介してフォトダイオ
ード2に結像される。
The light emitting diodes Lr, Lg, L, and b, which have emission wavelengths corresponding to the three primary colors of red, green, and blue, are connected to the same reading line R of the reading document DP.
The light reflected from the image on the reading line RL is imaged on the photodiode 2 via the lens 1.

発光ダイオードLr、Lg、Lbは、第2図に示したよ
うに3つの異なる発振周波数Fr、Fg、Fl)をそれ
ぞれもつ電源3r 、 3g、 3bによって点減点灯
される。なお、これらの電源3r 、 3g、 3bは
、例えば高周波数の矩形波を出力する高周波電源によっ
て構成される。
The light emitting diodes Lr, Lg, and Lb are dimmed and lit by power sources 3r, 3g, and 3b having three different oscillation frequencies (Fr, Fg, Fl), respectively, as shown in FIG. Note that these power sources 3r, 3g, and 3b are constituted by, for example, high-frequency power sources that output high-frequency rectangular waves.

フォトダイオード2の出力信号の処理装置を第3図に例
示する。
A processing device for the output signal of the photodiode 2 is illustrated in FIG.

同図において、フォトダイオード2の出力端の信号はバ
イパスコンデンサCによって直流成分が除去され、その
交流成分のみが演算増幅器OPに加えられ、この演算増
幅器OPの出力信号は、周波数Frの成分を弁別するバ
ンドパスフィルタFLr、周波数Fgの成分を弁別する
バンドパスフィルタFLgおよび周波数Fbの成分を弁
別するバンドパスフィルタFLbに加えられる。
In the figure, the DC component of the signal at the output end of the photodiode 2 is removed by a bypass capacitor C, and only the AC component is applied to the operational amplifier OP, and the output signal of the operational amplifier OP discriminates the frequency component. A bandpass filter FLr that discriminates the frequency Fg component, a bandpass filter FLg that discriminates the frequency Fb component, and a bandpass filter FLb that discriminates the frequency Fb component.

なお、フォトダイオード2には逆バイアス電圧が加えら
れていてその接合容量が小さくされており、周波数応答
性が良くなっている。
Note that a reverse bias voltage is applied to the photodiode 2 to reduce its junction capacitance and improve frequency response.

さて、発光ダイオードLr、Lg、、Lbはそれぞれ周
波数Fr、Fg、Fbで点減点灯されるから、フォトダ
イオード2には発光ダイオードLrの色すなわち赤に対
応した画信号が周波数Frで、発光ダイオードLgの色
すなわち緑に対応した画信号が周波数Fgで、発光ダイ
オードLbの色すなわち青に対応した画信号が周波数F
bで出力にあられれる。
Now, since the light emitting diodes Lr, Lg, and Lb are dimmed and lit at frequencies Fr, Fg, and Fb, respectively, the photodiode 2 receives an image signal corresponding to the color of the light emitting diode Lr, that is, red, at the frequency Fr, and the light emitting diode The image signal corresponding to the color of Lg, that is, green, has a frequency Fg, and the image signal corresponding to the color of light emitting diode Lb, that is, blue, has a frequency Fg.
b can be used for output.

したがって、バンドパスフィルタFLrからは赤色情報
に対応した画信号Srが、バンドパスフィルタFLgか
らは緑色情報に対応した画信号Sgが、バンドパスフィ
ルタFLbからは青色情報に対応した画信号sbがそれ
ぞれ出力される。
Therefore, the bandpass filter FLr outputs an image signal Sr corresponding to red information, the bandpass filter FLg outputs an image signal Sg corresponding to green information, and the bandpass filter FLb outputs an image signal sb corresponding to blue information. Output.

このようにして、各色情報に対応した画信号Sr。In this way, the image signal Sr corresponding to each color information is generated.

Sg、Sbが同時に得られる。Sg and Sb can be obtained at the same time.

読取線RLの1ライン分の画像を読み取るさいには、発
光ダイオードLr、Lg、Lbをそのラインに沿ってそ
れぞれアレイ状に構成し、レンズ1およびフォトダイオ
ード2をラインに沿って移動させるとともに画素毎のタ
イミングで画信号Sr、Sg、Sbを同時にサンプリン
グすればよい。
When reading an image for one line of the reading line RL, the light emitting diodes Lr, Lg, and Lb are arranged in an array along the line, and the lens 1 and the photodiode 2 are moved along the line, and the pixels are The image signals Sr, Sg, and Sb may be sampled simultaneously at each timing.

また、発光ダイオードLr 、 Lg 、 Lbをアレ
イ状に構成するとともにレンズ1に長尺なシリンドリカ
ルレンズを用い、フォトダイオード2として画素ピッチ
に応じたピッチで配列したアレイ状の素子を用いるよう
にしてもよい。その場合、各フォトダイオードの出力を
切換えて順次演算増幅器OPに加えるようにしてもよい
し、また、各フォトダイオードに対応して演算増幅器O
PおよびバンドパスフィルタFLr、FLg、FLbを
設けてもよい。
Alternatively, the light emitting diodes Lr, Lg, and Lb may be arranged in an array, a long cylindrical lens may be used as the lens 1, and the photodiode 2 may be an array of elements arranged at a pitch corresponding to the pixel pitch. good. In that case, the output of each photodiode may be switched and applied to the operational amplifier OP in sequence, or the output of the operational amplifier OP may be switched corresponding to each photodiode.
P and bandpass filters FLr, FLg, and FLb may be provided.

なお、上述した実施例では電源3r 、 3g 、 3
bの出力波形が矩形波であるが、これは回路構成の簡単
化のためであり、正弦波であってよい。高調波の少ない
正弦波のほうがバンドパスフィルタによって周波数弁別
が良好に行なわれることは言う迄もない。
In addition, in the embodiment described above, the power supplies 3r, 3g, 3
The output waveform of b is a rectangular wave, but this is to simplify the circuit configuration, and may be a sine wave. It goes without saying that frequency discrimination is better performed by a bandpass filter for a sine wave with fewer harmonics.

[効果] 以上説明したように、本発明によれは発光波長の異なる
光源を別々の周波数で点減点灯させ、受光素子の出力を
バンドパスフィルタで点滅周波数成分毎に分けて各色成
分の信号を出力するので、読取時間を大幅に短縮できる
[Effects] As explained above, according to the present invention, light sources with different emission wavelengths are dimmed and lit at different frequencies, and the output of the light receiving element is divided into each blinking frequency component using a bandpass filter to generate signals for each color component. Since the data is output, reading time can be significantly reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例に係る光学系を示した構成図
、第2図は光源の駆動部を示したブロック図、第3図は
フォトダイオードの出力信号の処理装置を示したブロッ
ク図である。 1・・ レンズ、2・・・ フォトダイオード、 3r
、3H。 3b−電源、Lr、Lg、l、b ・・発光ダイオード
、OP・・・演算増幅器、FLr、Fl3.FLb・・
・バンドパスフィルタ。
FIG. 1 is a block diagram showing an optical system according to an embodiment of the present invention, FIG. 2 is a block diagram showing a light source driving section, and FIG. 3 is a block diagram showing a processing device for a photodiode output signal. It is a diagram. 1... Lens, 2... Photodiode, 3r
, 3H. 3b-Power supply, Lr, Lg, l, b... Light emitting diode, OP... Operational amplifier, FLr, Fl3. FLb...
・Band pass filter.

Claims (1)

【特許請求の範囲】[Claims] 発光波長の異なる複数の光源と、この複数の光源をそれ
ぞれ異なる周波数で点滅する電源と、上記複数の光源で
照明された原稿からの反射光を受光する受光素子と、こ
の受光素子の出力信号から上記電源の複数の発振周波数
成分を弁別する複数のバンドパスフィルタを備え、この
バンドパスフィルタの各々の出力を、上記複数の光源の
発光波長成分とすることを特徴としたカラー原稿読取装
置。
A plurality of light sources with different emission wavelengths, a power supply that blinks the plurality of light sources at different frequencies, a light receiving element that receives reflected light from the document illuminated by the plurality of light sources, and an output signal from the light receiving element. A color document reading device comprising a plurality of bandpass filters for discriminating a plurality of oscillation frequency components of the power source, and an output of each of the bandpass filters is set as an emission wavelength component of the plurality of light sources.
JP59109418A 1984-05-31 1984-05-31 Color original reader Pending JPS60254868A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59109418A JPS60254868A (en) 1984-05-31 1984-05-31 Color original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59109418A JPS60254868A (en) 1984-05-31 1984-05-31 Color original reader

Publications (1)

Publication Number Publication Date
JPS60254868A true JPS60254868A (en) 1985-12-16

Family

ID=14509741

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59109418A Pending JPS60254868A (en) 1984-05-31 1984-05-31 Color original reader

Country Status (1)

Country Link
JP (1) JPS60254868A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003037042A1 (en) * 2001-10-22 2003-05-01 Koninklijke Philips Electronics N.V. Led control apparatus
WO2008096399A1 (en) * 2007-02-02 2008-08-14 Canon Components, Inc. Image reading-out device and its control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003037042A1 (en) * 2001-10-22 2003-05-01 Koninklijke Philips Electronics N.V. Led control apparatus
WO2008096399A1 (en) * 2007-02-02 2008-08-14 Canon Components, Inc. Image reading-out device and its control method

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