JPH0496566A - Irradiating device for reading picture - Google Patents

Irradiating device for reading picture

Info

Publication number
JPH0496566A
JPH0496566A JP2213970A JP21397090A JPH0496566A JP H0496566 A JPH0496566 A JP H0496566A JP 2213970 A JP2213970 A JP 2213970A JP 21397090 A JP21397090 A JP 21397090A JP H0496566 A JPH0496566 A JP H0496566A
Authority
JP
Japan
Prior art keywords
light
filter
light source
attenuation
distribution
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
JP2213970A
Other languages
Japanese (ja)
Inventor
Hiroyuki Takano
博之 高野
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.)
Fujitsu General Ltd
Original Assignee
Fujitsu General 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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP2213970A priority Critical patent/JPH0496566A/en
Publication of JPH0496566A publication Critical patent/JPH0496566A/en
Pending legal-status Critical Current

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  • Optical Elements Other Than Lenses (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To attain more accurate shading correction by arranging a light source attenuation filter in wiring having a density distribution able to correct illuminance of a light radiating to a double side original uniformly in response to the attenuation distribution of the light from the light source between the light source and the picture original being a read object. CONSTITUTION:A filter (light attenuation filter) 5 formed to have a density distribution able to correct the illuminance in response to the luminous intensity distribution characteristic is covered to a front face 6 of a glass case 3 of a halogen lamp 1. That is, the density distribution of the filter 5 is made dense so as to reduce the light to be passed in the middle of the glass case 3 and made thin so as to increase the light to be passed at the outer circumference. In this case, three torus regions of a concentric shape such as a part 7 whose light transmittivity from the center toward the outside, a medium part 8 and a high part 9 are set. The irradiating light emitted from a filament 2 is subject to light transmittivity correction by the filter 5 and the illuminance characteristic is almost flat after the filter 5.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、光源から出射した光を文字原稿を含む画像
原稿に照射し、その透過光によって原稿面に記載された
画像情報を画像読取手段に読み取らせるための画像読取
用照射装置に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] This invention irradiates light emitted from a light source onto an image original including a character original, and uses the transmitted light to read image information written on the surface of the original by an image reading means. This invention relates to an image reading irradiation device for reading images.

〔従 来 例〕[Conventional example]

画像読取装置はコンピュータなどに画像原稿の画像情報
を読み取らせるためのものであるが、光源からの光の分
布が均一でないことから、一般にシェーディング補正と
称される補正が行なわれている。シェープインク補正と
しては、機械的に行う方法と、機械的な方法と電気的な
方法すなわち電気回路とを組み合わせて行う方法とがあ
る。
An image reading device is used to cause a computer or the like to read image information of an image document, but since the distribution of light from a light source is not uniform, a correction generally called shading correction is performed. Shape ink correction includes a mechanical method and a combination of a mechanical method and an electrical method, that is, an electric circuit.

シェーディング補正を例えばシェーディング補正板を使
用して機械的に行う場合には、補正板の取付調整が難し
く、その作業に多くの時間が費やされる。また、機械的
方法と′耐久的方法とを組み合わせた場合には、機械的
なシェープインクで捕まえきれなかった受光部分のレベ
ルを回路的に増幅してやり、そのレベルを均一にするも
のであるが、機械的方法を使用する限り、機械的調整が
必要となる。
When shading correction is performed mechanically using, for example, a shading correction plate, it is difficult to attach and adjust the correction plate, and a lot of time is spent on the work. In addition, when the mechanical method and the durable method are combined, the level of the light-receiving area that cannot be captured by the mechanical shape ink is amplified using a circuit, and the level is made uniform. As long as mechanical methods are used, mechanical adjustments will be required.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

このように従来のシェーディング補正においては、シェ
ーディング補正板を使用した機械的構成があるかぎりそ
の調整作業から逃れることはできない。
As described above, in conventional shading correction, as long as there is a mechanical configuration using a shading correction plate, adjustment work cannot be avoided.

この発明はこのような従来技術の実情に鑑みてなされた
もので、その目的は、機械的に行うシェーディング補正
を省略し、機械的調整を不要にすることにより調整時間
を含む組立て時間を短縮できるとともに、より正確なシ
ェーディング補正が行なえるようにした画像読取用照射
装置を提供することにある。
This invention was made in view of the actual state of the prior art, and its purpose is to omit mechanical shading correction and eliminate the need for mechanical adjustment, thereby shortening assembly time including adjustment time. Another object of the present invention is to provide an image reading irradiation device that can perform more accurate shading correction.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するため、この発明は、イメージスキャ
ナのように原稿を画像読取手段を用いて読み取り、読み
取った画像を電気的信号に変換するための画像読取装置
に備えられ、光源から出射される出射光を読取対象とな
る画像に照射する画像読取用照射装置において、光源と
読取対象となる画像原稿との間に光源からの光の減衰分
布に応じて画像原稿に照射される光の照度を均一に補正
可能な濃度分布に形成された光減衰フィルタを配設した
構成になっている。
In order to achieve the above object, the present invention is provided in an image reading device for reading a document using an image reading means, such as an image scanner, and converting the read image into an electrical signal, which is emitted from a light source. In an image reading irradiation device that irradiates the image to be read with emitted light, the illuminance of the light irradiated to the image original is adjusted between the light source and the image original to be read according to the attenuation distribution of the light from the light source. The structure includes a light attenuation filter formed to have a density distribution that can be uniformly corrected.

この場合、光減衰フィルタは光源を覆う光透過性の透明
部材、例えばガラスの前面に直接設けることが望ましい
In this case, it is desirable to provide the light attenuation filter directly on the front surface of a light-transmitting transparent member, such as glass, that covers the light source.

(作   用〕 上記のように構成すると、光源から出射した光は光減衰
フィルタによって原稿面に照射されるときにはその照度
が均一に補正される。これにより、特にシェーディング
補正に際して調整を行わなくとも、原稿面での照度がほ
ぼ等しくなる。
(Function) With the above configuration, when the light emitted from the light source is irradiated onto the document surface by the light attenuation filter, the illuminance of the light is uniformly corrected.As a result, the illuminance of the light emitted from the light source is uniformly corrected without having to make any particular adjustment during shading correction. The illuminance on the document surface becomes almost equal.

〔実 施 例〕〔Example〕

以下、この発明の実施例を添付図面を参照しながら説明
する。
Embodiments of the present invention will be described below with reference to the accompanying drawings.

第3図は画像読取装置において一般に使用される反射鏡
付きハロゲンランプの正面図である。この反射鏡付きハ
ロゲンランプ(以下、ハロゲンランプと略称する)1は
中心に光源としてのフィラメント部2が設けられ、その
回りをガラス製のケース(以下、ガラスケースと称する
)3で覆っである。また、後部にはガラスケース3と連
続して密封空間を形成し、かつ電気的接続を行うための
]」金(図示せず)が設けられている。ガラスケース3
の外周の側面から後部にかけて反射鏡部4が例えばアル
ミニウムや銀の蒸着によって形成されている。これによ
り、ハロゲンランプ1を前面から見ると、中心にフィラ
メント部2が見え、外周に反射鏡部4が見えることにな
る。したがって、フィラメント部2に通電され、フィラ
メントが光り輝くと、第4図に示すようにガラスケース
3の前面側から出射される光の強度はフィラメントの中
心にあたる部分程強く、外周側に向かって徐々に弱くな
るような分布を示す。この分布はフィラメン1〜が点光
源と見なされることから同心円状になっている。
FIG. 3 is a front view of a halogen lamp with a reflector commonly used in image reading devices. This halogen lamp with a reflective mirror (hereinafter referred to as a halogen lamp) 1 is provided with a filament portion 2 as a light source at the center, which is surrounded by a glass case 3 (hereinafter referred to as a glass case). In addition, a metal plate (not shown) is provided at the rear part to form a sealed space continuously with the glass case 3 and to make an electrical connection. glass case 3
A reflecting mirror portion 4 is formed from the side surface to the rear portion of the outer periphery by, for example, vapor deposition of aluminum or silver. As a result, when the halogen lamp 1 is viewed from the front, the filament portion 2 is visible at the center and the reflecting mirror portion 4 is visible at the outer periphery. Therefore, when the filament part 2 is energized and the filament shines, the intensity of the light emitted from the front side of the glass case 3 is stronger at the center of the filament and gradually towards the outer periphery, as shown in FIG. It shows a weakening distribution. This distribution is concentric because the filaments 1 to 1 are regarded as point light sources.

したがって、ここでは特に説明しないが、公知の画像読
取装置の光源として上述のようなハロゲンランプ1を使
用すると、画像原稿に照射される光強度もまた、当然第
4図のような分布を示すことがわかる。
Therefore, although not specifically explained here, when the above-mentioned halogen lamp 1 is used as the light source of a known image reading device, the light intensity irradiated onto the image document naturally also shows a distribution as shown in FIG. I understand.

そこで、この実施例では第1図に示すように、第4図の
光強度分布特性に応じて光強度が均一になるように補正
可能な濃度分布に形成されたフィルタ(光減衰フィルタ
)5をハロゲンランプ1のガラスケース3の前面部6に
被せるようにした。
Therefore, in this embodiment, as shown in FIG. 1, a filter (light attenuation filter) 5 formed to have a concentration distribution that can be corrected so that the light intensity becomes uniform according to the light intensity distribution characteristics shown in FIG. 4 is used. It is arranged to cover the front part 6 of the glass case 3 of the halogen lamp 1.

すなわち、フィルタ5の濃度分布を第1図に示すように
、ガラスケース3の中央部では通過する光が少なくなる
ようにより濃く、外周部では通過する光が多くなるよう
により薄く形成しである。この場合、同心円状の円環状
の領域として、中心から外側に向かって光透過率が低い
部分7、中程度の部分8、高い部分9の三つの領域が設
定されている。この種のフィルタはいわゆるニュートラ
ルデンシティ−フィルタ(NDフィルタ)の一種とも考
えられる。
That is, as shown in FIG. 1, the density distribution of the filter 5 is formed so that it is denser in the center of the glass case 3 so that less light passes through it, and thinner in the outer peripheral part so that more light passes through it. In this case, three regions of low light transmittance 7, a medium region 8, and a high light transmittance region 9 are set as concentric annular regions outward from the center. This type of filter can also be considered a type of so-called neutral density filter (ND filter).

このようにして光源を構成すると、フィラメント部2か
ら出射した照射光はフィルタ5によって光の透過率が補
正され、第2図のようにフィルタ5を出たあと、はぼフ
ラットな光強度特性を示すので、特に機械的にシェーデ
ィング補正を行う必要がなくなり、これによりシェーデ
ィング補正のための機械的調整も当然不要になる。
When the light source is configured in this way, the light transmittance of the irradiated light emitted from the filament part 2 is corrected by the filter 5, and after exiting the filter 5 as shown in FIG. Therefore, there is no need to particularly mechanically perform shading correction, which naturally eliminates the need for mechanical adjustment for shading correction.

なお、この実施例にあっては、フィルタ5をハロゲンラ
ンプ1のガラスケース3の前面に被せた例について説明
しているが、この種のフィルタは光源と光照射対象とな
る原稿との間にいれて原稿に照射される光分布を均一に
できれば良いので、ガラスケース3の前面に被せなくと
もよいことは言うまでもない。ただし、この実施例のよ
うに、ガラスケース3の前面に被せると、ハロゲンラン
プ1の種類に応じて光強度の分布特性が決まっているの
でハロゲンランプ1からの距離に応じてフィルタ5の濃
度分布を選択もしくは設定する必要がなくなり、組立作
業も極めて簡単になる。また、フィルタ5の濃度分布は
、使用するハロゲンランプ1やその他の光源、例えば蛍
光灯などの光強度分布特性に応じて適宜設定されること
は言うまでもない。
Although this embodiment describes an example in which the filter 5 is placed over the front surface of the glass case 3 of the halogen lamp 1, this type of filter does not fit between the light source and the document to be irradiated with light. It goes without saying that it is not necessary to cover the front surface of the glass case 3, as long as the light distribution applied to the document can be made uniform. However, when the filter 5 is placed over the front surface of the glass case 3 as in this embodiment, the density distribution of the filter 5 varies depending on the distance from the halogen lamp 1 because the light intensity distribution characteristics are determined depending on the type of the halogen lamp 1. There is no need to select or set the settings, and the assembly work becomes extremely simple. It goes without saying that the density distribution of the filter 5 is appropriately set depending on the light intensity distribution characteristics of the halogen lamp 1 and other light sources used, such as fluorescent lamps.

〔発明の効果〕〔Effect of the invention〕

これまでの説明で明らかなように、光源と読取対象とな
る画像原稿との間に光源からの光の減衰分布に応じて画
像原稿に照射される光の照度を均一に補正可能な濃度分
布に形成された光減衰フィルタを配設した請求項1記載
の発明によれば、原稿に光が照射される時点で光強度を
ほぼ均一にすることができるので、シェーディング補正
を機械的に行う必要がなくなる。したがって、調整時間
を含む組み立て時間を短縮できるとともに、予め機械的
なシェーディング補正が完了した状態で電気的シェーデ
ィング補正を行うことができるので、より正確なシェー
ディング補正が可能となる。
As is clear from the previous explanation, a density distribution is created between the light source and the image original to be scanned that can uniformly correct the illuminance of the light irradiated to the image original according to the attenuation distribution of the light from the light source. According to the invention according to claim 1, in which the formed light attenuation filter is disposed, the light intensity can be made almost uniform at the time when the light is irradiated onto the document, so there is no need to perform shading correction mechanically. It disappears. Therefore, assembly time including adjustment time can be shortened, and since electrical shading correction can be performed after mechanical shading correction has been completed in advance, more accurate shading correction is possible.

また、光減衰フィルタを光源を覆う光透過性の透明部材
の前面に直接設けた請求項2記載の発明によれば、光源
自体が近似的に光強度が平均化した状態で照射光を出射
することになるので請求項1記載の発明と同様の効果を
奏することができる。
Further, according to the invention according to claim 2, in which the light attenuation filter is directly provided in front of the light-transmitting transparent member that covers the light source, the light source itself emits the irradiation light in a state where the light intensity is approximately averaged. Therefore, the same effect as the invention according to claim 1 can be achieved.

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

第1図は実施例に係るフィルタの正面図、第2図はフィ
ルタを被せたときの光源からの出射光の光強度分布特性
を示す特性図、第3図は反射鏡付きハロゲンランプの正
面図、第4図はその光強度分布特性を示す特性図である
。 図中、1は反射鏡付きハロゲンランプ、2はフィラメン
ト部、3はガラスケース、4は反射鏡部、5は光減衰フ
ィルタ、6は前面部、7は光透過率が低い部分、8は光
透過率が中程度の部分、9は光透過率が高い部分である
。 特許出願人  株式会社 富士通ゼネラル代理人 弁理
士  大 原 拓 也 第 図 反射鏡外周部 反射鏡外周部 第 図 第 図
Fig. 1 is a front view of the filter according to the example, Fig. 2 is a characteristic diagram showing the light intensity distribution characteristics of the light emitted from the light source when the filter is covered, and Fig. 3 is a front view of the halogen lamp with a reflector. , FIG. 4 is a characteristic diagram showing the light intensity distribution characteristics. In the figure, 1 is a halogen lamp with a reflector, 2 is a filament part, 3 is a glass case, 4 is a reflector part, 5 is a light attenuation filter, 6 is a front part, 7 is a part with low light transmittance, 8 is a light 9 is a portion with medium transmittance, and 9 is a portion with high light transmittance. Patent Applicant Fujitsu General Co., Ltd. Agent Patent Attorney Takuya Ohara Diagram of Reflector Outer Circumference Diagram of Reflector Outer Circumference Diagram

Claims (2)

【特許請求の範囲】[Claims] (1)原稿を画像読取手段を用いて読み取り、読み取っ
た画像を電気的信号に変換するための画像読取装置に備
えられ、光源から出射される出射光を読取対象となる画
像に照射する画像読取用照射装置において、 光源と読取対象となる画像原稿との間に光源からの光の
減衰分布に応じて画像原稿に照射される光の照度を均一
に補正可能な濃度分布に形成された光減衰フィルタを配
設したことを特徴とする画像読取用照射装置。
(1) Image reading, which is installed in an image reading device that reads a document using an image reading means and converts the read image into an electrical signal, and illuminates the image to be read with light emitted from a light source. In the irradiation device, a light attenuation is formed between the light source and the image original to be read to have a density distribution that can uniformly correct the illuminance of the light irradiated to the image original according to the attenuation distribution of light from the light source. An irradiation device for image reading, characterized in that a filter is provided.
(2)上記光減衰フィルタが上記光源を覆う光透過性の
透明部材の前面に直接設けられている請求項1に記載の
画像読取用照射装置。
(2) The image reading irradiation device according to claim 1, wherein the light attenuation filter is provided directly in front of a light-transmitting transparent member that covers the light source.
JP2213970A 1990-08-13 1990-08-13 Irradiating device for reading picture Pending JPH0496566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2213970A JPH0496566A (en) 1990-08-13 1990-08-13 Irradiating device for reading picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2213970A JPH0496566A (en) 1990-08-13 1990-08-13 Irradiating device for reading picture

Publications (1)

Publication Number Publication Date
JPH0496566A true JPH0496566A (en) 1992-03-27

Family

ID=16648081

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2213970A Pending JPH0496566A (en) 1990-08-13 1990-08-13 Irradiating device for reading picture

Country Status (1)

Country Link
JP (1) JPH0496566A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0616919U (en) * 1992-08-14 1994-03-04 リズム時計工業株式会社 Lens unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0616919U (en) * 1992-08-14 1994-03-04 リズム時計工業株式会社 Lens unit

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