JP5059327B2 - Illumination device for image reading apparatus - Google Patents

Illumination device for image reading apparatus Download PDF

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JP5059327B2
JP5059327B2 JP2006002413A JP2006002413A JP5059327B2 JP 5059327 B2 JP5059327 B2 JP 5059327B2 JP 2006002413 A JP2006002413 A JP 2006002413A JP 2006002413 A JP2006002413 A JP 2006002413A JP 5059327 B2 JP5059327 B2 JP 5059327B2
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illumination unit
sub
document
image reading
image
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JP2007184832A (en
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末男 上野
克也 永持
秀和 関沢
邦彦 三浦
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Toshiba Corp
Toshiba TEC Corp
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Description

本発明は、読み取り対象である原稿を照明する画像読取装置の照明装置に関するものである。 The present invention relates to lighting equipment of the image reading apparatus for illuminating an original is read object.

従来、ガラス等の透明部材で構成された原稿台上を搬送され又は該原稿台上に載置された原稿を原稿台の下方に配置した照明装置からの光で照明し、これを光学的に走査し、原稿からの反射光をCCD等の光電変換素子に結像させ、その受光量に応じた蓄積電荷量を電気的なアナログ信号として出力し、これをデジタル信号に変換して読み取り画像のデータとして取得する画像読取装置が知られる。 Conventionally, a document that has been transported on or placed on a document table made of a transparent member such as glass or the like is illuminated with light from an illumination device disposed below the document table , and this is optically detected. The reflected light from the original is imaged on a photoelectric conversion element such as a CCD, and the accumulated charge amount corresponding to the amount of received light is output as an electrical analog signal, which is converted into a digital signal, An image reading apparatus that acquires data is known.

上述のような従来の画像読取装置では、原稿面に対して照射された光の反射光を撮像する構成上、原稿からの反射光が光電変換素子へと向かう光路上に光源を配置することは難しい。よって、上記従来の画像読取装置では、照明装置によって原稿面を斜め方向から照明し、原稿面から反射される光を光電変換素子に結像させる構成となっている。   In the conventional image reading apparatus as described above, it is possible to image the reflected light of the light irradiated onto the document surface, and to arrange the light source on the optical path where the reflected light from the document goes to the photoelectric conversion element. difficult. Therefore, the conventional image reading apparatus is configured to illuminate the document surface from an oblique direction by the illumination device and form an image of light reflected from the document surface on the photoelectric conversion element.

上記従来の画像読取装置のように、原稿表面を斜め方向から照明する場合、読み取り対象となる原稿等の表面に凹凸があると、当該凹凸を原因とする影が発生してしまう。このようにして発生した影は、読み取り画像において影となって現れる。   When the surface of the document is illuminated obliquely as in the conventional image reading apparatus, if the surface of the document or the like to be read has unevenness, a shadow caused by the unevenness is generated. The shadow generated in this way appears as a shadow in the read image.

そこで、照明装置の構成として、副走査方向に沿って移動する前記照明装置は、副走査方向に沿って同一光源を対向して設置し、前記対向する同一光源により、該対向する同一光源の中央位置でその上方の原稿台ガラスに載置された原稿の原稿画像の読取対象となる読取領域を副走査方向の両側から照明することにより、原稿面に凹凸がある部分においても読み取り画像上に影(黒く写る画像)が発生することを抑制することのできる技術が提供されている。 Therefore, as a configuration of the illuminating device, the illuminating device that moves along the sub-scanning direction is provided with the same light source facing the sub-scanning direction, and the same light source facing the center of the facing same light source. By illuminating the reading area to be read of the original image of the original placed on the upper platen glass at a position from both sides in the sub-scanning direction , even in the portion where the original surface is uneven, the shadow is not reflected on the read image. There is provided a technique capable of suppressing the occurrence of (a black image).

上述のような従来の画像読取装置では、原稿台に載置された原稿の画像を読み取る際、原稿台の端部に設けられた突き当て板に対して原稿の端部を突き当てて位置決めし、所定方向(いわゆる副走査方向)に移動する照明装置により原稿面を走査する。   In the conventional image reading apparatus as described above, when reading the image of the document placed on the document table, the end of the document is abutted against the butting plate provided at the end of the document table. The document surface is scanned by an illumination device that moves in a predetermined direction (so-called sub-scanning direction).

図5に示すように、突き当て板に突き当てられた状態で原稿台に載置された原稿の端部と突き当て板との間には僅かな隙間ができるため、例えばA方向およびB方向の二方向から照明したとしても、この隙間部分近傍の読み取り画像には影が生じ易い。そこで、従来の画像読取装置では、原稿と突き当て板との間の隙間が影として読み取り画像上に現れることを回避するため、読み取り画像上における突き当て板から所定範囲の画像をトリミングすることとしている。   As shown in FIG. 5, since a slight gap is formed between the end of the document placed on the document table and the butting plate in a state of being butted against the butting plate, for example, the A direction and the B direction. Even if the illumination is performed from the two directions, a shadow is likely to occur in the read image near the gap. Therefore, in the conventional image reading apparatus, in order to avoid the gap between the document and the abutting plate from appearing as a shadow on the scanned image, the image in a predetermined range is trimmed from the abutting plate on the scanned image. Yes.

同様に、図6に示すように、原稿台に載置された原稿の突き当て板に突き当てられていない側の端部近傍にも、原稿の厚みや撓み等を原因として影が発生する場合がある。しかし、上述した突き当て板と原稿端部との間の隙間とは異なり、影がどのような範囲に生ずるかは原稿のサイズ等に依存するため、予め把握しておくことができない。よって、突き当て板に突き当てられていない側の端部近傍の画像について予め定められた範囲だけ画像をトリミングして影の発生を防ぐといった処理は行なわれておらず、読み取り画像上に当該端部近傍の影が現れてしまう場合があった。   Similarly, as shown in FIG. 6, when a shadow is generated near the end of the document placed on the document table on the side not abutted against the abutting plate, due to the thickness or bending of the document. There is. However, unlike the above-described gap between the butting plate and the document edge, the range in which the shadow is generated depends on the size of the document and cannot be grasped in advance. Therefore, there is no processing such as trimming the image within a predetermined range to prevent the occurrence of shadows on the image near the end on the side that is not abutted against the abutting plate. There was a case where a shadow near the part appeared.

また上述のように、従来の画像読取装置では、読み取り画像上の原稿影の発生を抑制するために、原稿の読み取り対象となる領域(読取領域とする)を原稿台ガラスの法線に対して対的な二方向から同一の光源によって照明する構成となっている。しかしながら、画像読取装置において原稿の照明のために用いられる光源はキセノンランプ等の比較的高価な光源である。よって、このような高価な光源の設置数を増加させることなく、読み取り画像上における影の発生を抑制しつつ、コストダウンに寄与することのできる照明装置が求められている。 Also as described above, in the conventional image reading apparatus, in order to suppress the generation of the original shadow on the readout image, the area to be read of the document (the reading area) with respect to the normal of the platen glass and it has a configuration that illuminated by the same light source from symmetrical manner bi-directional. However, the light source used for illuminating the document in the image reading apparatus is a relatively expensive light source such as a xenon lamp. Therefore, there is a need for an illumination device that can contribute to cost reduction while suppressing the occurrence of shadows on a read image without increasing the number of such expensive light sources installed.

本発明は上述した問題点を解決するためになされたものであり、原稿台に載置された原稿の画像を読み取り可能な画像読取装置において、低コスト且つ簡便な構成により、原稿台に載置される原稿の位置決め用の突き当て板に突き当てない側の端部近傍における読取り画像上の影の発生を抑制する技術を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an image reading apparatus capable of reading an image of a document placed on a document table is placed on the document table with a low-cost and simple configuration. It is an object of the present invention to provide a technique for suppressing the occurrence of a shadow on a read image in the vicinity of an end portion on the side that does not abut against an abutting plate for positioning a document.

上述した課題を解決するために、本発明に係る画像読取装置の照明装置は、原稿を載置する原稿台と、前記原稿台の副走査方向の一端側に設けられ、前記原稿台に載置する原稿の一端が突き当てられて前記原稿の位置決めを行う突き当て板と、前記原稿台の下方に配置され、副走査方向に移動して前記原稿台に載置した原稿の画像を撮像部により読み取る画像読取センサとを有し、前記画像読取センサには、第1および第2の照明部から照射され前記原稿画像にて反射した反射光を前記撮像部に結像させる結像光学系を有する画像読取装置において、前記画像読取センサに設けられ、前記画像読取センサの副走査方向への移動に従って、前記原稿台上に載置した原稿の読取領域を副走査方向に移動しながら照明する照明装置であって、前記原稿台上に載置される前記原稿の読取領域を照明し、該原稿面からの反射光が前記撮像部に導かれる前記第1の照明部と、前記原稿台上に載置される前記原稿の読取領域を前記第1の照明部と同時に照明し、該原稿面からの反射光が前記撮像部に導かれ、前記撮像部を挟んで前記第1の照明部に対して副走査方向において対向配置され、光源として赤色LED、緑色LEDおよび青色LEDの3つを備えた白色タイプの導光管から構成され、前記第1の照明部よりも発光色の帯域幅が広い照明光を照射する前記第2の照明部と、を有し、副走査方向に沿って対向配置する前記第1の照明部と前記第2の照明部とは、前記突き当て板の配置側を副走査方向の一端側とすると、前記第1の照明部を副走査方向の一端側に配置し、前記第2の照明部を副走査方向の他端側に配置したことを特徴とするものである。 In order to solve the above-described problems, an illumination device of an image reading apparatus according to the present invention is provided on a document table on which a document is placed and one end side in the sub-scanning direction of the document table, and is placed on the document table. An image of the original placed on the original table and placed on the original table by being moved in the sub-scanning direction is disposed below the original table and a butting plate for positioning one end of the original to be abutted. An image reading sensor for reading, and the image reading sensor has an imaging optical system that forms an image on the image pickup unit of reflected light that is irradiated from the first and second illumination units and reflected by the document image. In the image reading apparatus, the illumination is provided in the image reading sensor and illuminates while moving the reading area of the document placed on the document table in the sub-scanning direction according to the movement of the image reading sensor in the sub-scanning direction. A device comprising: Illuminating the reading area of the document placed on the table, and the first illumination unit reflected light from the original surface is guided to the imaging section, of the document placed on the document table The reading area is illuminated simultaneously with the first illuminating unit, and reflected light from the document surface is guided to the imaging unit, and is arranged opposite to the first illuminating unit in the sub-scanning direction across the imaging unit. is, the red LED as the light source is composed of a white type light guide tube equipped with a three green LED and blue LED, the first the first bandwidth emission color than the illumination unit irradiates the wider illumination light The first illuminating unit and the second illuminating unit that are opposed to each other along the sub-scanning direction, and the one side in the sub-scanning direction is the arrangement side of the abutting plate. Then, the first illumination unit is arranged on one end side in the sub-scanning direction, and the second illumination unit is It is characterized in that arranged on the other end side of the scanning direction.

以上に詳述したように本発明によれば、原稿台に載置された原稿の画像を読み取り可能な画像読取装置において、低コスト且つ簡便な構成により、原稿台に載置される原稿の位置決め用の突き当て板に突き当てない側の端部近傍における読取り画像上の影の発生を抑制する技術を提供することができる。   As described above in detail, according to the present invention, in an image reading apparatus capable of reading an image of a document placed on a document table, positioning of the document placed on the document table with a low cost and simple configuration. Therefore, it is possible to provide a technique for suppressing the occurrence of a shadow on the read image in the vicinity of the end portion on the side that does not abut against the abutment plate.

以下、本発明の実施の形態について図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1は、本実施の形態による画像読取装置の照明装置およびこれを備えた画像読取装置について説明するための全体構成図である。本実施の形態による画像読取装置1は、同図に示すように画像処理装置(MFP:Multi Function Peripheral)Mに設置されている。   FIG. 1 is an overall configuration diagram for explaining an illumination device of an image reading apparatus and an image reading apparatus including the same according to the present embodiment. The image reading apparatus 1 according to the present embodiment is installed in an image processing apparatus (MFP: Multi Function Peripheral) M as shown in FIG.

図1に示す画像処理装置Mは、画像読取装置1および画像形成装置2を備えてなる構成となっており、画像形成装置2では、外部機器から受信した画像データや画像読取装置1にて原稿から読み取られた画像データに基づく画像形成処理(プリント処理やコピー処理等)が可能となっている。また、画像処理装置Mは、画像読取装置1および画像形成装置2にて兼用される中央演算処理装置(CPU105およびメモリー106を備えている。 An image processing apparatus M shown in FIG. 1 includes an image reading apparatus 1 and an image forming apparatus 2. In the image forming apparatus 2, image data received from an external device or a document is read by the image reading apparatus 1. Image forming processing (print processing, copy processing, etc.) based on the image data read from is possible. In addition, the image processing apparatus M includes a central processing unit ( CPU ) 105 and a memory 106 that are shared by the image reading apparatus 1 and the image forming apparatus 2.

画像読取装置1は、原稿を照明する照明装置および当該照明装置により照明された原稿面からの反射光を撮像するための光学系および撮像部を備えた画像読取センサであるCIS:Contact Image Sensor)120を副走査方向Rに移動(走査)させることにより原稿台ガラス109上に載置された原稿の画像を読み取る手置き読み取り(図2参照)と、副走査方向であるF方向に移動する自動原稿読取装置(ADF(Auto Document Feeder)により搬送される原稿の画像を所定位置Pで静止したCIS120によって読み取る自動原稿読み取りとが可能となっている。 The image reading apparatus 1 is an image reading sensor including an illuminating device that illuminates a document, an optical system for imaging reflected light from a document surface illuminated by the illuminating device, and an imaging unit ( CIS: Contact Image Sensor). ) Moving (scanning) 120 in the sub-scanning direction R to perform manual placement reading (see FIG. 2) for reading the image of the document placed on the platen glass 109, and moving in the F direction, which is the sub-scanning direction. an automatic document reading read by CIS120 stationary image of the document conveyed at a predetermined position P by the automatic document reader (ADF (auto document Feeder)) is possible.

なお、画像読取装置1において手置き読み取りを行う場合、所定方向に対して直交するように原稿台の副走査方向の一端部に設けられた突き当て板107に対して、原稿台に載置される原稿の端部を突き当て、位置決めすることにより、原稿を主走査方向および副走査方向に対して傾かせることなく原稿面を読み取ることが可能となっている。 In the case of performing read manually placed in the image reading apparatus 1, with respect to the abutment plate 107 provided on one end of the platen in the sub-scanning direction so as to be orthogonal to the predetermined direction, placed on the document table By abutting and positioning the end of the original to be read, the original surface can be read without tilting the original with respect to the main scanning direction and the sub-scanning direction.

図3は、本実施の形態による画像読取装置1におけるCIS120の詳細を示す構成図である。同図に示すように、CIS120は、第1の照明部121、第2の照明部122、光学系125および撮像部126を備えており、原稿台ガラス109の下方に配置されているFIG. 3 is a configuration diagram showing details of the CIS 120 in the image reading apparatus 1 according to the present embodiment. As shown in the figure, the CIS 120 includes a first illumination unit 121, a second illumination unit 122, an optical system 125, and an imaging unit 126, and is disposed below the document table glass 109 .

本実施の形態による画像読取装置1では、CIS120を読み取り対象である原稿の原稿面と所定方向Rにおいて物理的に相対移動させることにより副走査方向の画像読み取りを行い、撮像部126を構成する光電変換素子により主走査方向(図1の紙面に対する法線方向)の画像読み取りを行うことにより、所定の読取領域の範囲内での原稿の画像読取を実現している。 In the image reading apparatus 1 according to the present embodiment, the CIS 120 is physically moved relative to the original surface of the original to be read in the predetermined direction R to read the image in the sub-scanning direction, and the photoelectric component constituting the imaging unit 126 is read. By performing image reading in the main scanning direction (normal direction with respect to the paper surface of FIG. 1) by the conversion element, image reading of a document within a predetermined reading area is realized.

第1の照明部121は、光源として黄緑色(Yellow/Green:YGタイプ)発光素子(LEDを備えた発光素子(LEDアレイから構成され、原稿面に対して所定角度だけ傾斜する方向から原稿の読取領域を照明する。このように、第1の照明部121は、単一波長の照明光を照射する。 The first illuminating unit 121 includes a light emitting element ( LED ) array including a yellow / green (YG type) light emitting element ( LED ) as a light source, and is inclined from the document surface by a predetermined angle. Illuminates the reading area of the document. Thus, the 1st illumination part 121 irradiates the illumination light of a single wavelength.

第2の照明部122は、光源として赤色発光素子(LED、緑色発光素子(LEDおよび青色発光素子(LEDの3つを備えた白色タイプの導光管から構成される。図3に示すように、副走査方向Rに沿って、第1の照明部121と第2の照明部122とを対向配置しており、図3に示すように、副走査方向に沿って対向配置する第1の照明部121と第2の照明部122とは、突き当て板107の配置側を副走査方向の一端側とすると、第1の照明部121を副走査方向の一端側に配置し、第2の照明部122を副走査方向の他端側に配置している。
そして、第1の照明部121と第2の照明部122とは、上方に位置する原稿台ガラス109を通して原稿画像の読取領域を照明する。第1の照明部121と第2の照明部122は、その間の中央に位置する原稿画像の読取領域を副走査方向の両側から照明する。
また、第2の照明部122は、第1の照明部121よりも発光色の帯域幅が広い(多波長の)照明光を照射する。
The 2nd illumination part 122 is comprised from the white type light guide tube provided with three of a red light emitting element ( LED ) , a green light emitting element ( LED ), and a blue light emitting element ( LED ) as a light source. As shown in FIG. 3, the first illumination unit 121 and the second illumination unit 122 are arranged to face each other along the sub-scanning direction R, and face each other along the sub-scanning direction as shown in FIG. 3. The first illuminating unit 121 and the second illuminating unit 122 to be arranged arrange the first illuminating unit 121 on one end side in the sub-scanning direction when the arrangement side of the butting plate 107 is one end side in the sub-scanning direction. The second illumination unit 122 is arranged on the other end side in the sub-scanning direction.
Then, the first illumination unit 121 and the second illumination unit 122 illuminate the reading area of the document image through the document glass plate 109 positioned above. The first illuminating unit 121 and the second illuminating unit 122 illuminate the reading area of the document image located at the center between both sides in the sub-scanning direction.
The second illumination unit 122 emits illumination light having a wider emission color bandwidth (multi-wavelength) than the first illumination unit 121.

このように、本実施の形態による画像読取装置の照明装置では、原稿の読取領域に対して線対な二つの位置から照明することにより、原稿面上の凹凸の有無に拘らず、影の無い読み取り画像を得ることができる構成となっている。また、CIS120を副走査方向に移動させて手置き読み取りを行う場合、原稿台の突き当て板107に一端が突き当てられた状態で載置されている原稿に対してCIS120が走査を行い、副走査の終期に達すると、該原稿の他端を第2の照明部122が照明する。すなわち、前記用紙の他端を第2の照明部122により発光色の帯域幅が広い照射光で照射できる構成とすることで、当該端部近傍の原稿の読取領域の画像の色による影の現れ方に差が無いようにする(画像上のより多くの色から有効な反射光を得る)ことが可能となり、結果として当該端部近傍における読み取り画像における影の発生を抑制することができる。 Thus, in the illumination device of the image reading apparatus according to this embodiment, by illuminating from the line symmetry of two positions with respect to the reading area of the document, regardless of the presence or absence of irregularities on the original surface, the shadow It is the structure which can obtain the reading image without. In addition, when performing manual placement reading by moving the CIS 120 in the sub-scanning direction , the CIS 120 scans the document placed with one end abutted against the abutting plate 107 of the document table , and the sub-scan is performed. When the end of scanning is reached, the second illumination unit 122 illuminates the other end of the document. That is, the other end of the sheet can be irradiated with irradiation light having a wide emission color bandwidth by the second illumination unit 122 , so that a shadow due to the color of the image in the reading area of the document in the vicinity of the end portion appears. Therefore, it is possible to prevent the difference in the direction (to obtain effective reflected light from more colors on the image), and as a result, it is possible to suppress the occurrence of shadows in the read image near the edge.

光学系125は、セルフォックレンズ(登録商標)から構成され、第1の照明部121および第2の照明部122から照射され原稿の読取領域にて反射された光(図3における下方へ向かう矢印参照)を、所定の結像位置へと導く。ここでは、光学系125は、その全部がCIS120上に配置されている例を示している。 The optical system 125 is composed of a SELFOC lens (registered trademark) , and is irradiated from the first illuminating unit 121 and the second illuminating unit 122 and reflected by the reading region of the document (downward arrow in FIG. 3). To the predetermined imaging position. Here, an example in which the entire optical system 125 is arranged on the CIS 120 is shown.

撮像部126は、光電変換素子等から構成され、光学系125により所定の結像位置へと導かれた光を撮像する。撮像部126にて撮像された原稿の画像は、メモリー106に格納され、必要に応じて画像形成装置2或いは画像処理装置Mと通信可能な外部機器に対して送信される。 The imaging unit 126 is configured by a photoelectric conversion element or the like, and images the light guided to a predetermined imaging position by the optical system 125. The image of the document imaged by the imaging unit 126 is stored in the memory 106 and transmitted to an external device that can communicate with the image forming apparatus 2 or the image processing apparatus M as necessary.

また画像処理装置Mは、発光制御部124を備えている。発光制御部124は、第1の照明部121からの照射光と第2の照明部122からの照射光とが混色されることにより、原稿面での照射光の分光特性(波長分布)が、キセノンランプ、ハロゲンランプ、LED、蛍光灯およびエレクトロルミネッセンス(ELのうちいずれか一つから構成される白色光源の分光特性(所定の波長分布)と略同じとなるような発光比率で、第1の照明部121および第2の照明部122それぞれを構成する各光源を発光させる。上述の各光源の所定の発光比率に関する情報は、発光制御部124或いはメモリー106に保持される。 The image processing apparatus M includes a light emission control unit 124. The light emission control unit 124 mixes the illumination light from the first illumination unit 121 and the illumination light from the second illumination unit 122, so that the spectral characteristic (wavelength distribution) of the illumination light on the document surface is The first emission ratio is substantially the same as the spectral characteristic (predetermined wavelength distribution) of a white light source composed of any one of a xenon lamp, a halogen lamp, an LED, a fluorescent lamp, and electroluminescence ( EL ) . Each light source which comprises each of the illumination part 121 of this and the 2nd illumination part 122 is made to light-emit. Information on the predetermined light emission ratio of each light source described above is held in the light emission control unit 124 or the memory 106.

図4は、第1の照明部121を構成する黄緑色LEDおよび第2の照明部122を構成する赤色LED、緑色LED、青色LEDの分光特性を示す図である。このように、本実施の形態では、第1の照明部121を構成する黄緑色LEDと、第2の照明部122を構成する赤色LED、緑色LEDおよび青色LED(3波長白色タイプ)の2種類の異なる分光特性を持つ照明部の照射光を組合せて、理想とする分光特性(例えば、白色のキセノンランプの分光特性)に近い照射光を形成する。これにより、理想とする分光特性を有する同一の光源を用いることなく、一方を安価な光源によって実現することができ、装置全体としての低コスト化に寄与することができる。   FIG. 4 is a diagram showing the spectral characteristics of the yellow-green LED constituting the first illumination unit 121 and the red LED, green LED, and blue LED constituting the second illumination unit 122. Thus, in the present embodiment, two types of yellow-green LEDs that constitute the first illumination unit 121 and red LEDs, green LEDs, and blue LEDs (three-wavelength white type) that constitute the second illumination unit 122 are provided. The irradiation light of the illumination unit having different spectral characteristics is combined to form irradiation light close to the ideal spectral characteristics (for example, the spectral characteristics of a white xenon lamp). Thus, one can be realized by an inexpensive light source without using the same light source having ideal spectral characteristics, which can contribute to cost reduction of the entire apparatus.

また発光制御部124は、第1の照明部121から照射されて原稿面にて反射される光の撮像部126での受光量と、第2の照明部122から照射されて原稿面にて反射される光の撮像部126での受光量(受光強度)とが略同じになる発光比率(照射強度設定用発光比率)で、第1の照明部121および第2の照明部122それぞれを構成する各光源を発光させるようにすることもできる。このように、撮像部126での受光量が略同じとなるように第1の照明部121および第2の照明部122それぞれを構成する光源を発光させることで、原稿面の凹凸に起因する影が読み取り画像に現れることを効果的に抑制することができる。ここでは、発光制御部124は、第1の照明部121と第2の照明部122の発光量(発光強度)の比率を、
第1の照明部121の光量:第2の照明部122の光量 = 2:3
としている。
Further, the light emission control unit 124 receives the amount of light received by the imaging unit 126 of the light irradiated from the first illumination unit 121 and reflected from the document surface, and reflected from the document surface irradiated from the second illumination unit 122. The first illuminating unit 121 and the second illuminating unit 122 are configured with a light emission ratio (light emission ratio for irradiating intensity setting) at which the amount of received light (light reception intensity) at the imaging unit 126 becomes substantially the same. Each light source can also emit light. In this way, by causing the light sources constituting the first illumination unit 121 and the second illumination unit 122 to emit light so that the amounts of light received by the imaging unit 126 are substantially the same, shadows caused by unevenness on the document surface are caused. Can effectively be suppressed from appearing in the read image. Here, the light emission control unit 124 determines the ratio of the light emission amounts (light emission intensity) of the first illumination unit 121 and the second illumination unit 122.
Light amount of first illumination unit 121: Light amount of second illumination unit 122 = 2: 3
It is said.

また、本実施の形態では、第2の照明部122は、副走査方向Rにおいて、第1の照明部121よりも光学系125から僅かに離れた位置に配置されている。このように第2の照明部122を光学系125からより遠い位置に配置することで、原稿台に載置された原稿の突き当て板107に突き当てられていない側の端部を所定方向Rにより近い角度から照明することができ、当該端部近傍における読み取り画像における影の発生を抑制することが可能となる。 In the present embodiment, the second illumination unit 122 is arranged in a position slightly separated from the optical system 125 in the sub-scanning direction R than the first illumination unit 121. By arranging the second illumination unit 122 at a position farther from the optical system 125 in this way, the end portion of the document not placed on the abutting plate 107 placed on the document table is placed in the predetermined direction R. It is possible to illuminate from a closer angle, and it is possible to suppress the occurrence of shadows in the read image near the edge.

このように、本実施の形態による画像読取装置の照明装置は、第1の照明部121、第2の照明部122および発光制御部124を備えてなる構成となっており、原稿台に載置された原稿の読取領域を所定方向に走査しつつ照明する機能を有している。 As described above, the illumination device of the image reading apparatus according to the present embodiment is configured to include the first illumination unit 121, the second illumination unit 122, and the light emission control unit 124, and is placed on the document table. It has a function of illuminating while scanning the read area of the original document in a predetermined direction.

以上、詳述したように本実施の形態によれば、読み取り光学系に通常用いられる導光管等の光源と導光管のような光源よりも安価なLEDアレイ等の光源とを用いる構成とすることにより、低コストで高画質な画像読み取りを実現することのできる照明装置を提供することができる。また、波長の帯域が広い光源を副走査方向における原稿突き当て板よりも遠い側に配置することで、突き当て板に突き当てられない側の原稿端近傍における読み取り画像上の影の発生を抑制することができ、ユーザに対して安価で高品質が画像読取装置を提供することができる。   As described above in detail, according to the present embodiment, a configuration using a light source such as a light guide tube normally used in a reading optical system and a light source such as an LED array that is less expensive than a light source such as a light guide tube By doing so, it is possible to provide an illumination device capable of realizing high-quality image reading at low cost. In addition, by arranging a light source with a wide wavelength band on the side farther than the original abutting plate in the sub-scanning direction, the generation of shadows on the scanned image near the end of the original that is not abutted against the abutting plate is suppressed. Therefore, it is possible to provide a low-cost and high-quality image reading apparatus to the user.

本発明を特定の態様により詳細に説明したが、本発明の精神および範囲を逸脱しないかぎり、様々な変更および改質がなされ得ることは、当業者には自明であろう。   Although the present invention has been described in detail according to particular embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

本実施の形態による画像読取装置の照明装置およびこれを備えた画像読取装置について説明するための全体構成図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram for explaining an illumination device of an image reading device according to an embodiment and an image reading device including the same. 手置き読み取り時におけるCISの動作について説明するための図である。It is a figure for demonstrating the operation | movement of CIS at the time of manual placement reading. 本実施の形態による画像読取装置1におけるCIS120の詳細を示す構成図である。It is a block diagram which shows the detail of CIS120 in the image reading apparatus 1 by this Embodiment. 第1の照明部121を構成する黄緑色LEDおよび第2の照明部122を構成する赤色LED、緑色LED、青色LEDの分光特性、及び目標とする分光特性を示す図である。It is a figure which shows the spectral characteristic of the yellow green LED which comprises the 1st illumination part 121, and the red LED, green LED, and blue LED which comprise the 2nd illumination part 122, and the target spectral characteristic. 読み取り画像上に現れる影について説明するための図である。It is a figure for demonstrating the shadow which appears on a reading image. 読み取り画像上に現れる影について説明するための図である。It is a figure for demonstrating the shadow which appears on a reading image.

107 突き当て板、120 CIS、121 第1の照明部、122 第2の照明部、124 発光制御部、125 光学系、126撮像部。
107 abutting plate, 120 CIS, 121 first illumination unit, 122 second illumination unit, 124 light emission control unit, 125 optical system, 126 imaging unit.

Claims (3)

原稿を載置する原稿台と、前記原稿台の副走査方向の一端側に設けられ、前記原稿台に載置する原稿の一端が突き当てられて前記原稿の位置決めを行う突き当て板と、前記原稿台の下方に配置され、副走査方向に移動して前記原稿台に載置した原稿の画像を撮像部により読み取る画像読取センサとを有し、前記画像読取センサには、第1および第2の照明部から照射され前記原稿画像にて反射した反射光を前記撮像部に結像させる結像光学系を有する画像読取装置において、前記画像読取センサに設けられ、前記画像読取センサの副走査方向への移動に従って、前記原稿台上に載置した原稿の読取領域を副走査方向に移動しながら照明する照明装置であって、
前記原稿台上に載置される前記原稿の読取領域を照明し、該原稿面からの反射光が前記撮像部に導かれる前記第1の照明部と、前記原稿台上に載置される前記原稿の読取領域を前記第1の照明部と同時に照明し、該原稿面からの反射光が前記撮像部に導かれ、前記撮像部を挟んで前記第1の照明部に対して副走査方向において対向配置され、光源として赤色LED、緑色LEDおよび青色LEDの3つを備えた白色タイプの導光管から構成され、前記第1の照明部よりも発光色の帯域幅が広い照明光を照射する前記第2の照明部と、を有し、副走査方向に沿って対向配置する前記第1の照明部と前記第2の照明部とは、前記突き当て板の配置側を副走査方向の一端側とすると、前記第1の照明部を副走査方向の一端側に配置し、前記第2の照明部を副走査方向の他端側に配置した画像読取装置の照明装置。
An original platen on which an original is placed; an abutting plate that is provided on one end side in the sub-scanning direction of the original platen and that positions one end of the original placed on the original platen so as to position the original; and An image reading sensor which is arranged below the document table and moves in the sub-scanning direction and reads an image of the document placed on the document table by an image pickup unit ; the image reading sensor includes first and second image reading sensors; the image reading apparatus which have the imaging optical system for imaging on the imaging unit the light reflected by the original image is irradiated from the illumination unit of, provided in the image reading sensor, the sub scanning of the image reading sensor An illumination device for illuminating a reading area of a document placed on the document table while moving in a sub-scanning direction according to movement in a direction;
Illuminating the reading area of the document placed on the platen, said first illumination unit which reflected light from the original surface is guided to the imaging unit, said to be placed on said platen The reading area of the document is illuminated simultaneously with the first illumination unit, and reflected light from the document surface is guided to the imaging unit, and in the sub-scanning direction with respect to the first illumination unit across the imaging unit It is arranged to face each other and is composed of a white type light guide tube provided with three red LEDs, green LEDs and blue LEDs as a light source, and irradiates illumination light having a wider emission color bandwidth than the first illumination unit. wherein the second illumination unit has, the second illumination unit and the first illumination unit which face each other along the sub-scanning direction, the sub-scanning direction of one arrangement side of the abutment plate The first illumination unit is disposed on one end side in the sub-scanning direction, and the second illumination unit is Part illumination device of an image reading apparatus disposed on the other end side in the sub-scanning direction.
請求項に記載の画像読取装置の照明装置において、
前記第1の照明部からの照射光と前記第2の照明部からの照射光とが混色されることにより、前記原稿画像に対する照射光を白色光源の波長分布と同じとした画像読取装置の照明装置。
The illumination device of the image reading device according to claim 1 ,
By the irradiation light from the second illumination unit and the light irradiated from the first illumination unit are mixed, the image reading apparatus was the same as the wavelength distribution of white color light source irradiating light to the document image Lighting device.
請求項1または2に記載の画像読取装置の照明装置において、前記結像光学系は、副走査方向において、前記第1の照明部と前記第2の照明部との間に配置され、前記第2の照明部は、前記副走査方向において、前記第1の照明部よりも前記結像光学系から離れた位置に配置されている画像読取装置の照明装置。3. The illumination device of the image reading apparatus according to claim 1, wherein the imaging optical system is disposed between the first illumination unit and the second illumination unit in the sub-scanning direction, and The illumination unit of the image reading device is arranged in a position farther from the imaging optical system than the first illumination unit in the sub-scanning direction.
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