JP4973473B2 - Non-contact scanner - Google Patents

Non-contact scanner Download PDF

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JP4973473B2
JP4973473B2 JP2007314457A JP2007314457A JP4973473B2 JP 4973473 B2 JP4973473 B2 JP 4973473B2 JP 2007314457 A JP2007314457 A JP 2007314457A JP 2007314457 A JP2007314457 A JP 2007314457A JP 4973473 B2 JP4973473 B2 JP 4973473B2
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holding jig
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JP2009141556A (en
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清志 石原
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Oki Electric Industry Co Ltd
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Description

本発明は非接触スキャナに関する。   The present invention relates to a non-contact scanner.

帳票等に記載された内容を画像データとして保存するために、撮像面を上に向けて帳票等を載置するためのマット部と、このマット部の上空一定高さに設置されたデジタルカメラ等の撮像部とを有する非接触スキャナが用いられている(例えば、特許文献1参照)。このような非接触スキャナでは、通常の室内照明光等に由来する帳票表面からの反射光を利用して帳票の画像データを取得している。   In order to save the contents described in the form as image data, a mat part for placing the form etc. with the imaging surface facing upward, a digital camera installed at a certain height above the mat part, etc. A non-contact scanner having an imaging unit is used (see, for example, Patent Document 1). In such a non-contact scanner, the image data of the form is acquired by using the reflected light from the form surface derived from normal indoor illumination light or the like.

この非接触スキャナを用いて、免許証等のように光沢のある撮像面を撮像する場合、撮像面からの反射光によって撮像面の一部が所謂白飛びを起こしてしまい、画像の一部が薄く写っていたり、白く抜けてしまったりして、視認性に問題が生じることがある。このような問題を解決する方法として、撮像面からの反射が起こりにくい撮像部の直下に被撮像媒体を載置して撮像を行う方法が考えられる。   When this non-contact scanner is used to image a glossy imaging surface such as a license, a part of the imaging surface causes so-called whitening due to reflected light from the imaging surface, and a part of the image is There may be a problem in visibility due to faint or missing white. As a method for solving such a problem, there can be considered a method of performing imaging by placing an imaging medium directly under an imaging unit in which reflection from the imaging surface is unlikely to occur.

しかしながら、被撮像媒体を撮像部の直下に載置しても、被撮像媒体の反り等によって部分的に白飛びが発生する場合がある。また、撮像部を大きくすることによって撮像部の影を大きくし、この影に被撮像媒体の撮像面が収まるようにすれば、白飛びを抑制することはできるが、撮像部が大きくなることによって撮像面の照度の確保が困難となり、明瞭な画像を得ることが難しくなるという新たな問題が生じる。
特開2002−344739号公報
However, even when the imaging medium is placed directly under the imaging unit, whiteout may occur partially due to warpage of the imaging medium. Also, if the image pickup unit is enlarged by making the shadow of the image pickup unit larger and the image pickup surface of the image pickup medium fits in the shadow, whiteout can be suppressed, but the image pickup unit becomes larger. It becomes difficult to ensure the illuminance of the imaging surface, and a new problem arises that it becomes difficult to obtain a clear image.
JP 2002-344739

本発明はかかる事情に鑑みてなされたものであり、撮像部に入射する被撮像媒体からの反射光を低減することができる非接触スキャナを提供することを目的とする。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a non-contact scanner capable of reducing reflected light from an imaging medium incident on an imaging unit.

本発明による非接触スキャナは、被撮像媒体を保持する凹曲面を備えた保持部材と、前記保持部材に保持された前記被撮像媒体を撮像する撮像部と、前記撮像部と前記保持部材との間を一定間隔で離間させる間隔保持部とを具備し、前記保持部材の前記凹曲面は円弧状の断面を有し、前記撮像部の光学的焦点から前記凹曲面に対し垂直に下ろした法線の長さが前記凹曲面の曲率半径と等しくなっていることを特徴としている。 A non-contact scanner according to the present invention includes a holding member having a concave curved surface for holding an image pickup medium, an image pickup unit for picking up the image pickup medium held by the holding member, and the image pickup unit and the holding member. comprising a space holding portion which are spaced from each other by a constant interval between the concave curved surface of the holding member has an arcuate cross-section, drawn from the optical focal point of the imaging unit vertically against the concave curved surface normal Is equal to the radius of curvature of the concave curved surface.

本発明によれば、撮像部に入射する被撮像媒体からの反射光を低減することができる。したがって、被撮像媒体を撮像した際に白飛びのない明瞭な画像を得ることができる。また、保持部材の凹曲面が円筒凹曲面である場合には、被撮像媒体にしわが生じにくい。   ADVANTAGE OF THE INVENTION According to this invention, the reflected light from the to-be-imaged medium which injects into an imaging part can be reduced. Therefore, it is possible to obtain a clear image without whiteout when the imaged medium is imaged. In addition, when the concave curved surface of the holding member is a cylindrical concave curved surface, wrinkles are unlikely to occur on the imaged medium.

以下、本発明の実施の形態について図面を参照しながら詳細に説明する。図1に非接触スキャナの概略構造を表した正面図を示し、図2に非接触スキャナの概略構造を表した平面図を示す。非接触スキャナ10は、被撮像媒体としての撮像原稿21を保持するための円筒凹曲面を有する保持部材である保持治具14と、保持治具14を載置するためのマット部(ステージ)13と、保持治具14に保持された撮像原稿21を撮像する撮像部11と、撮像部11と保持治具14との間を一定間隔で離間させて撮像部11を保持する間隔保持具としての支柱部12とを備えている。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing the schematic structure of the non-contact scanner, and FIG. 2 is a plan view showing the schematic structure of the non-contact scanner. The non-contact scanner 10 includes a holding jig 14 that is a holding member having a cylindrical concave curved surface for holding an imaged document 21 as an image pickup medium, and a mat portion (stage) 13 for mounting the holding jig 14. As an interval holder that holds the imaging unit 11 by separating the imaging unit 11 that captures the imaging document 21 held by the holding jig 14, and the imaging unit 11 and the holding jig 14 at a predetermined interval. A support column 12 is provided.

撮像原稿21とは、ここでは、免許証やラミネート処理が施されたカード、所定の画像や写真が印刷された光沢用紙等であって、表面に光沢のあるものをいう。   Here, the imaged document 21 refers to a card having a license or a laminate process, glossy paper on which a predetermined image or photo is printed, and the like having a glossy surface.

図3に保持治具の概略構造を表した斜視図を示す。保持治具14の形状と設置方向は、撮像部11の形状および設置高さ,設置方向と密接に関係する。そこで、これらの関係を考慮しながら非接触スキャナ10の構成を簡単かつ明確に説明するために、図1〜3に示される通り、マット部13の上面(水平面)をX−Y平面とし、このX−Y平面と直交する方向(鉛直方向)をZ方向とする3次元直交座標系を定める。   FIG. 3 is a perspective view showing a schematic structure of the holding jig. The shape and installation direction of the holding jig 14 are closely related to the shape, installation height, and installation direction of the imaging unit 11. Therefore, in order to simply and clearly describe the configuration of the non-contact scanner 10 in consideration of these relationships, the upper surface (horizontal plane) of the mat portion 13 is an XY plane as shown in FIGS. A three-dimensional orthogonal coordinate system is defined in which the direction (vertical direction) orthogonal to the XY plane is the Z direction.

保持治具14は、曲率半径Rの円筒凹曲面が撮像部11側(Z方向)を向くように、かつ、円弧状の側面(以下「弧状側面」という)がX方向と平行になるように、直線上の側面(以下「直線状側面」という)がY方向と平行になるように、マット部13に装着されている。図1に示されている円Sは、保持治具14の内周を弧の一部とする半径Rの円であり、その中心は、後述する通り、撮像部11の光学的焦点Pと一致する。   The holding jig 14 has a cylindrical concave curved surface with a radius of curvature R facing the imaging unit 11 side (Z direction) and an arc-shaped side surface (hereinafter referred to as “arc-shaped side surface”) parallel to the X direction. The mat portion 13 is mounted such that the side surface on the straight line (hereinafter referred to as “straight side surface”) is parallel to the Y direction. A circle S shown in FIG. 1 is a circle having a radius R with the inner periphery of the holding jig 14 as a part of an arc, and the center thereof coincides with the optical focus P of the imaging unit 11 as described later. To do.

保持治具14はマット部13に対して着脱自在である。この着脱機構として、保持治具14の裏面のX方向中央においてY方向に離間した2カ所に突起部16が形成されており、マット部13にはこの突起部16を嵌め込むための穴部17が形成されている。この着脱機構は、保持治具14をマット部13に対して位置決めする役割をも果たす。   The holding jig 14 is detachable from the mat portion 13. As this attachment / detachment mechanism, projections 16 are formed at two locations separated in the Y direction at the center in the X direction on the back surface of the holding jig 14, and a hole 17 for fitting the projection 16 into the mat portion 13. Is formed. This attachment / detachment mechanism also serves to position the holding jig 14 with respect to the mat portion 13.

保持治具14の円筒凹曲面上の一方の直線状側面近傍には、撮像用紙21を保持治具14の円筒凹曲面に押圧する機能を有するクリップ部15が、Y方向に延在するように設けられている。撮像原稿21において撮像の必要のない余白部分をクリップ部15に挟み込むと、撮像原稿21の位置が固定されるとともに、撮像原稿21が保持治具14の円筒凹曲面に沿って密着して保持される。このようにして撮像原稿21を保持治具14に固定することにより、撮像原稿21にしわが発生することを抑制することができる。   In the vicinity of one linear side surface on the cylindrical concave surface of the holding jig 14, a clip portion 15 having a function of pressing the imaging paper 21 against the cylindrical concave curved surface of the holding jig 14 extends in the Y direction. Is provided. When a blank portion of the imaged document 21 that does not require imaging is sandwiched between the clip portions 15, the position of the imaged document 21 is fixed and the imaged document 21 is held in close contact with the cylindrical concave surface of the holding jig 14. The By fixing the imaged document 21 to the holding jig 14 in this way, it is possible to suppress wrinkling of the imaged document 21.

撮像部11は、回転楕円体の形状を有するハウジング25の内部に、CCDやCMOS等の受光素子に複数のレンズからなる光学系を用いて撮像画像を写し込む所謂デジタルカメラ26が内蔵されたものが好適に用いられる。デジタルカメラ26は、その光学系焦点Pがハウジング25の中央真下に位置するように、ハウジング25の内部に収容されている。   The imaging unit 11 includes a so-called digital camera 26 that captures a captured image using an optical system composed of a plurality of lenses in a light receiving element such as a CCD or CMOS inside a housing 25 having a spheroid shape. Are preferably used. The digital camera 26 is housed inside the housing 25 so that the optical system focal point P is located directly below the center of the housing 25.

撮像部11は、ハウジング25の長径軸がY方向と平行となるように、かつ、保持治具14の円筒凹曲面の中心の直上にデジタルカメラ26の光学的焦点Pが位置するように、かつ、この光学的焦点Pから保持治具14の円筒凹曲面に対し垂直に下ろした法線の長さがこの円筒凹曲面の曲率半径Rと等しくなるように、支柱部12によって位置決めされ、保持されている。逆に言えば、撮像部11が一定位置に設置された場合に、前記の条件が満たされるように、保持治具14はマット部13に装着される必要がある。 The imaging unit 11 is configured so that the major axis of the housing 25 is parallel to the Y direction, and the optical focus P of the digital camera 26 is positioned directly above the center of the cylindrical concave surface of the holding jig 14. as the length of the normal line drawn perpendicular against the cylindrical concave surface of the holding jig 14 from the optical focal point P is equal to the radius of curvature R of the cylindrical concave surface, is positioned by struts 12, it is retained ing. In other words, the holding jig 14 needs to be attached to the mat portion 13 so that the above condition is satisfied when the imaging unit 11 is installed at a certain position.

なお、撮像原稿21には一定の厚みがあるが、撮像原稿21が円筒凹曲面に沿って密着している限りは、デジタルカメラ26の光学的焦点Pから撮像原稿21の表面までの線の長さと撮像原稿21の表面の曲率半径とは等しくなる。また、複数の撮像原稿21が冊子状に束ねられており撮像に必要な頁を開いて撮像しなければならない場合でも、束ねられた撮像原稿21が円筒凹曲面に沿って密着して保持されていれば、デジタルカメラ26の光学的焦点Pから最も上の撮像原稿21の表面までの線の長さとその撮像原稿21の表面の曲率半径とは等しくなる。 Although the imaging document 21 has a certain thickness, so long as the imaging document 21 is in close contact along the cylindrical concave surface, the law line from the optical focal point P of the digital camera 26 to the surface of the imaging document 21 The length and the radius of curvature of the surface of the imaged document 21 are equal. Further, even when a plurality of imaging originals 21 are bundled in a booklet shape and a page necessary for imaging needs to be opened and imaged, the bundled imaging originals 21 are held in close contact with each other along the cylindrical concave curved surface. lever, is equal to the length of the legal line from the optical focal point P of the digital camera 26 to the uppermost surface of the imaging document 21 and the radius of curvature of the surface of the imaging document 21.

次に、保持治具14と撮像部11の各形状とこれらの設置条件について説明する。図1,2に示されるように、保持治具14の直線状側面間長さ(X方向長さであって、保持治具14の円筒凹曲面に沿った長さではない)を“D”とし、弧状側面間長さ(Y方向長さ)を“L”とする。また、撮像部11の短径を“X1”とし、長径を“Y1”とする。なお、撮像部11の短径,長径はそれぞれ、ハウジング25の短径,長径に等しい。   Next, the shapes of the holding jig 14 and the imaging unit 11 and the installation conditions thereof will be described. As shown in FIGS. 1 and 2, the length between the linear side surfaces of the holding jig 14 (the length in the X direction, not the length along the cylindrical concave curved surface of the holding jig 14) is set to “D”. And the length between the arc-shaped side surfaces (the length in the Y direction) is “L”. In addition, the minor axis of the imaging unit 11 is “X1”, and the major axis is “Y1”. The short diameter and long diameter of the imaging unit 11 are equal to the short diameter and long diameter of the housing 25, respectively.

X方向においては保持治具14の円筒凹曲面は常にデジタルカメラ26の光学的焦点Pと正対しているので、照明光が撮像原稿21上のある点に直接反射してデジタルカメラ26に入射するためには、光源は撮像原稿21上のある点とデジタルカメラ26のレンズとを結ぶ線上に存在しなければならない。このため、室内照明光等の照明光が撮像部11の上方からマット部13に向けて照射されている場合には、照明光の照射角度に関係なく照明光がハウジング25によって遮られることによって、保持治具14の円筒凹曲面のX方向においては保持治具14の円筒凹曲面に保持された撮像原稿21の光沢表面での反射が起こりにくい。つまり、X方向において、保持治具14の円筒凹曲面に保持された撮像原稿21の光沢表面からの反射光(直接反射光)は、デジタルカメラ26の光学的焦点Pに入射しにくい。   In the X direction, the cylindrical concave surface of the holding jig 14 always faces the optical focal point P of the digital camera 26, so that the illumination light is directly reflected at a certain point on the imaged document 21 and enters the digital camera 26. For this purpose, the light source must be on a line connecting a certain point on the imaged document 21 and the lens of the digital camera 26. For this reason, when illumination light such as room illumination light is emitted from above the imaging unit 11 toward the mat unit 13, the illumination light is blocked by the housing 25 regardless of the illumination angle of the illumination light. In the X direction of the cylindrical concave curved surface of the holding jig 14, reflection on the glossy surface of the imaged document 21 held on the cylindrical concave curved surface of the holding jig 14 hardly occurs. That is, in the X direction, the reflected light (directly reflected light) from the glossy surface of the imaging document 21 held on the cylindrical concave curved surface of the holding jig 14 is difficult to enter the optical focus P of the digital camera 26.

したがって、X方向において保持治具14の円筒凹曲面に保持された撮像原稿21に対して白飛びを発生させることなく撮像が可能な範囲、すなわち、保持治具14の直線状側面間長さDは、撮像部11のX方向の影の範囲に限られない。よって、撮像部11の短径X1の制限を受けることなく、理論的には、D<2R(R:保持治具14における円筒凹曲面の曲率半径)であればよい。ただし、撮像原稿21全体を撮像する場合、保持治具14の直線状側面近傍では撮像原稿21に描かれている文字や図形等の情報の歪みが大きくなり、また、撮像原稿21全体にピントを合わせることが困難になる。そのため、現実的には、保持治具14の直線状側面間長さDは、許容される画像を撮像可能な値に設定することが好ましい。   Therefore, in the X direction, the imaging document 21 held on the cylindrical concave curved surface of the holding jig 14 can be imaged without causing whiteout, that is, the length D between the straight side surfaces of the holding jig 14. Is not limited to the shadow range in the X direction of the imaging unit 11. Therefore, theoretically, D <2R (R: radius of curvature of the cylindrical concave curved surface in the holding jig 14) may be used without being limited by the minor axis X1 of the imaging unit 11. However, when the entire imaged document 21 is imaged, distortion of information such as characters and figures drawn on the imaged document 21 increases near the linear side surface of the holding jig 14, and the entire imaged document 21 is focused. It becomes difficult to match. Therefore, practically, it is preferable to set the length D between the linear side surfaces of the holding jig 14 to a value that allows an acceptable image to be captured.

一方、保持治具14のY方向には曲率が設けられていないために、室内照明光等の照明光が撮像部11の上方からマット部13に向けて照射されている場合に、保持治具14の円筒凹曲面に保持された撮像原稿21の表面からの反射光が撮像部11の光学的焦点Pに入射しないように、保持治具14の弧状側面間長さLを定める必要がある。ハウジング25の形状が回転楕円体であるために、撮像部11のY方向長さはX方向位置にしたがって変化する。このため、撮像部11の影のY方向長さもX方向位置によって変化する。しかし、デジタルカメラ26の光学的焦点Pは、撮像部11の長径軸を含み、X軸と直交する面内に位置するため(図2参照)、撮像部11の長径Y1のみを考慮すればよい。   On the other hand, since no curvature is provided in the Y direction of the holding jig 14, the holding jig is used when illumination light such as room illumination light is irradiated from above the imaging unit 11 toward the mat unit 13. It is necessary to determine the length L between the arcuate side surfaces of the holding jig 14 so that the reflected light from the surface of the imaging document 21 held on the cylindrical concave curved surface 14 does not enter the optical focal point P of the imaging unit 11. Since the shape of the housing 25 is a spheroid, the length in the Y direction of the imaging unit 11 changes according to the position in the X direction. For this reason, the Y direction length of the shadow of the imaging unit 11 also changes depending on the X direction position. However, since the optical focal point P of the digital camera 26 includes the major axis of the imaging unit 11 and is located in a plane orthogonal to the X axis (see FIG. 2), only the major axis Y1 of the imaging unit 11 needs to be considered. .

図4にY方向における撮像部の形状と照明光の入反射の関係を模式的に示す。この図4には保持治具14がX方向で二等分された断面が示されている。撮像部11の上方に設けられた光源からマット部13に向けて照明光が照射されたときにマット部13に写る撮像部11の長径Y1に起因する影により生じる照明光の無反射領域の領域内に保持治具14の各弧状側面が収まっていれば、反射条件(光の入射角=光の反射角)を成立させる照明光が撮像原稿21に入射しないため、撮像原稿21の表面からの反射光が撮像部11の光学的焦点Pに入射することもない。 FIG. 4 schematically shows the relationship between the shape of the imaging unit and the incident / reflection of illumination light in the Y direction. FIG. 4 shows a cross section in which the holding jig 14 is equally divided in the X direction. When illumination light is irradiated from the light source provided above the imaging unit 11 toward the mat unit 13, a non-reflective region of illumination light caused by a shadow caused by the major axis Y <b> 1 of the imaging unit 11 reflected on the mat unit 13 in the region, if the arcuate side surface of the holding jig 14 is seated, because the illumination light is not incident on the imaging document 21 to establish the reflection condition (reflection angle of the incident angle = light of the light), the imaging document 21 Reflected light from the surface does not enter the optical focal point P of the imaging unit 11.

したがって、撮像部11の長径Y1に起因する影により生じる照明光の無反射領域のY方向長さが、保持治具14の弧状側面間長さLとして許容される最大長さとなる。こうして保持治具14の円筒凹曲面の形状が決定され、この円筒凹曲面の領域内に撮像原稿21が保持されていれば、撮像原稿21からの反射が低減されて、白飛びの発生が抑制された明瞭な画像が得られる。 Therefore, the length in the Y direction of the non-reflecting area of the illumination light caused by the shadow caused by the major axis Y1 of the imaging unit 11 is the maximum length allowed as the length L between the arcuate side surfaces of the holding jig 14. Thus, when the shape of the cylindrical concave curved surface of the holding jig 14 is determined and the imaging original 21 is held within the area of the cylindrical concave curved surface, the reflection from the imaging original 21 is reduced and the occurrence of whiteout is suppressed. A clear image is obtained.

このように保持治具14の形状を円筒凹曲面とするのは、撮像対象のカードや用紙を球面に湾曲させるのは難しく、円筒状とするのが現実的であるためである。このため、図1や図2のように例えばX方向を湾曲させてY方向を湾曲させないような形状とした場合、湾曲させた方向については保持治具14の湾曲により反射を低減させ、湾曲させない方向については、ハウジング25の影を利用した照明光の無反射領域により反射を低減させる。このように、保持時具14の形状とハウジングの形状の組み合わせることにより、効果的な反射低減が実現できる。 The reason why the shape of the holding jig 14 is a cylindrical concave curved surface is that it is difficult to curve a card or paper to be imaged into a spherical shape , and it is practical to use a cylindrical shape. For this reason, as shown in FIGS. 1 and 2, for example, when the X direction is curved and the Y direction is not curved, reflection is reduced by the bending of the holding jig 14 and the curved direction is not curved. Regarding the direction, the reflection is reduced by the non-reflective area of the illumination light using the shadow of the housing 25. Thus, effective reduction of reflection can be realized by combining the shape of the holding tool 14 and the shape of the housing.

続いて、非接触スキャナ10による撮像原稿21の撮像手順について説明する。図5に非接触スキャナによる撮像手順を表したフローチャートを示す。最初に、使用する保持治具14の円筒凹曲面の曲率半径Rに合わせて、撮像部11を所定位置に設置し、撮像部11の長径Y1に起因してマット部13に写る影のY方向長さが、保持治具14の弧状側面間長さL以上となっていることを確認する(ST1)。撮像原稿21を保持治具14にセットし(ST2)、これをマット部13に装着し(ST3)、撮像を行う(ST4)。   Subsequently, an imaging procedure of the imaging document 21 by the non-contact scanner 10 will be described. FIG. 5 is a flowchart showing an imaging procedure using a non-contact scanner. First, in accordance with the curvature radius R of the cylindrical concave curved surface of the holding jig 14 to be used, the imaging unit 11 is installed at a predetermined position, and the Y direction of the shadow reflected on the mat unit 13 due to the major axis Y1 of the imaging unit 11 It is confirmed that the length is not less than the length L between the arcuate side surfaces of the holding jig 14 (ST1). The imaging document 21 is set on the holding jig 14 (ST2), this is mounted on the mat portion 13 (ST3), and imaging is performed (ST4).

なお、撮像部11により撮像された画像データは、撮像部11に内蔵されたコンピュータ読み取り可能な記録媒体に保存されてもよいし、撮像部11から有線または無線を問わず画像データがコンピュータシステムに送信されて、そのコンピュータシステムを構成するコンピュータ読み取り可能な記録媒体に保存されてもよい。   Note that the image data captured by the imaging unit 11 may be stored in a computer-readable recording medium built in the imaging unit 11, and image data from the imaging unit 11, regardless of wired or wireless, is stored in the computer system. It may be transmitted and stored in a computer-readable recording medium constituting the computer system.

保持治具14をマット部13から取り外し(ST5)、撮像済みの撮像原稿21を抜き取る(ST6)。次の撮像原稿21がなければ、ここで作業は終了し、一方、次の撮像原稿21がある場合にはST2に戻る。なお、保持治具14をマット部13に装着した状態で、撮像原稿21の取り付け、撮像、取り外しを繰り返す方法を用いてもよい。   The holding jig 14 is removed from the mat portion 13 (ST5), and the imaged document 21 that has been imaged is extracted (ST6). If there is no next imaged document 21, the operation ends here. On the other hand, if there is a next imaged document 21, the process returns to ST2. Note that a method of repeatedly attaching, imaging, and removing the imaging document 21 in a state where the holding jig 14 is mounted on the mat portion 13 may be used.

このように撮像部11の形状と設置位置を考慮して保持治具14の形状を定め、保持治具14の円筒凹曲面に密着させて撮像原稿21を保持することにより、撮像原稿21からの反射光を抑えて、明瞭な画像を得ることができる。   In this way, the shape of the holding jig 14 is determined in consideration of the shape and installation position of the imaging unit 11, and the imaging document 21 is held in close contact with the cylindrical concave surface of the holding jig 14. A reflected image can be suppressed and a clear image can be obtained.

なお、保持治具14を用いずに、撮像原稿21を低反射で半透明なフォルダに収容し、このフォルダをマット部13上に載置して撮像部11による撮像を行う方法によっても、撮像原稿21からの反射光を低減することができるが、このような方法では、撮像面の文字や画像が不明瞭になるという問題や、半透明フォルダに撮像原稿21を入れたり出したりする等の作業に対する負荷が大きくなる等の問題がある。これに対して、保持治具14を用いた撮像では、このような問題が生じないという利点がある。   The imaging document 21 can also be stored in a low-reflective and translucent folder without using the holding jig 14, and the folder can be placed on the mat unit 13 and imaged by the imaging unit 11. The reflected light from the document 21 can be reduced. However, with such a method, there is a problem that characters and images on the imaging surface become unclear, and the imaging document 21 is put in and out of a semi-transparent folder. There is a problem such as a heavy load on work. In contrast, imaging using the holding jig 14 has an advantage that such a problem does not occur.

次に、非接触スキャナ10に用いられる保持治具14の変形例について説明する。図6に非接触スキャナに用いられる別の保持治具およびその周辺部の斜視図を示す。保持治具31の上面は円筒凹曲面となっており、その直線状側面部にクリップ部15が設けられている。保持治具31は、マット部13上に安定して載置することができるように、平坦な底部を備えた構造を有している。   Next, a modified example of the holding jig 14 used in the non-contact scanner 10 will be described. FIG. 6 shows a perspective view of another holding jig used in the non-contact scanner and its peripheral portion. The upper surface of the holding jig 31 is a cylindrical concave curved surface, and the clip portion 15 is provided on the linear side surface portion. The holding jig 31 has a structure having a flat bottom so that the holding jig 31 can be stably placed on the mat portion 13.

保持治具31をマット部13上の一定位置に容易に載置することができるように、マット部13の表面に載置位置を示すマーカ18が印刷されている。保持治具31として大きさの異なる複数のものが準備されている場合には、それぞれの大きさに応じた載置位置を示すマーカをマット部13上に印刷しておくことが好ましい。なお、保持治具31をマット部13の一定位置に載置する方法としては、前記した突起部16と穴部17とによる着脱機構を用いることもできる。   A marker 18 indicating the placement position is printed on the surface of the mat portion 13 so that the holding jig 31 can be easily placed at a fixed position on the mat portion 13. In the case where a plurality of holding jigs 31 having different sizes are prepared, it is preferable to print on the mat portion 13 a marker indicating a mounting position corresponding to each size. As a method of placing the holding jig 31 at a fixed position on the mat portion 13, an attaching / detaching mechanism using the projection 16 and the hole 17 can be used.

図6では、マット部13の表面に保持治具31をその四隅で位置決めするマーカ18を印刷しているが、これに限られず、例えば、マット部13の表面に保持治具31を載置すべき位置のX方向とY方向の中心線をそれぞれ示す十字の線を印刷し、他方、保持治具31の側面にそれぞれの中央を示すマーカを印刷しておき、これらのマーカどうしを合わせる構成としてもよい。   In FIG. 6, the markers 18 for positioning the holding jig 31 at the four corners are printed on the surface of the mat portion 13. However, the present invention is not limited to this. For example, the holding jig 31 is placed on the surface of the mat portion 13. A cross line indicating the center line in the X direction and the Y direction of the power position is printed, and on the other hand, a marker indicating each center is printed on the side surface of the holding jig 31 so that these markers are aligned with each other. Also good.

前記実施の形態では、マット部13に保持治具14,31を装着する構成としたが、これらを一体化させた構造とすることも好ましい。すなわちマット部そのものが保持部材となる。図7に別のマット部の概略構造を表した断面図を示す。このマット部32は中空構造となっており、上面に形成されている円筒凹曲面の中央部の一定範囲に複数の吸着孔33が設けられている。マット部32の内部を吸引ポンプ等の減圧機構34によって減圧することにより、撮像原稿21(図7には図示せず)を円筒凹曲面に沿って確実に吸着保持することができる。マット部32の円筒凹曲面には、種々の大きさの撮像原稿21をそれぞれ適切な位置に保持するためのマーカ(図示せず)が印刷されていることが好ましい。   In the above embodiment, the holding jigs 14 and 31 are mounted on the mat portion 13, but it is also preferable to have a structure in which these are integrated. That is, the mat portion itself becomes a holding member. FIG. 7 is a sectional view showing a schematic structure of another mat portion. The mat portion 32 has a hollow structure, and a plurality of suction holes 33 are provided in a certain range of the central portion of the cylindrical concave curved surface formed on the upper surface. By decompressing the inside of the mat portion 32 by a decompression mechanism 34 such as a suction pump, the imaged document 21 (not shown in FIG. 7) can be reliably sucked and held along the cylindrical concave curved surface. It is preferable that a marker (not shown) for holding the imaging document 21 of various sizes in an appropriate position is printed on the cylindrical concave curved surface of the mat portion 32.

このようなマット部32を用いれば、円筒凹曲面にクリップ部15が設けられていないために、撮像原稿21の周囲に余白がない場合にも、撮像原稿21の全面を明瞭に撮像することができる利点がある。なお、マット部32を平板で覆えば、撮像原稿を平坦に載置する非接触スキャナとして用いることができる。勿論、マット部32の円筒凹曲面にクリップ部15を設けた構造としてもよい。   If such a mat portion 32 is used, since the clip portion 15 is not provided on the cylindrical concave curved surface, the entire surface of the imaged document 21 can be clearly imaged even when there is no margin around the imaged document 21. There are advantages you can do. If the mat portion 32 is covered with a flat plate, it can be used as a non-contact scanner for placing an imaged document flat. Of course, the clip portion 15 may be provided on the cylindrical concave curved surface of the mat portion 32.

以上、本発明の実施の形態について説明したが、本発明はこのような実施の形態に限定されるものではない。例えば、保持治具14,31として円筒凹曲面を有するものを取り上げたが、保持治具14,31の形状はこれに限定されるものではなく、撮像原稿21を載置する凹曲面として球状凹曲面を有するものを用いることができる。このようにすれば、ハウジング25の影による照明光の無反射領域を利用する必要がなくなるため、原稿サイズに必要な分のハウジングサイズを確保する必要がなくなり、ハウジング25を小型化することができる。ただし、平らな撮像原稿21を球状凹曲面に押し当てると撮像原稿21にしわが発生しやすくなるため、球状凹曲面の曲率半径は所望される画像を得ることができる範囲において定める必要がある。このような構成では、球状凹曲面に保持された撮像原稿21の表面は全ての方向で撮像部11の光学的焦点Pと正対することから、ハウジング25として、回転楕円体を用いる必要はなく、例えば球形のものを用いることができる。 As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment. For example, the holding jigs 14 and 31 having a cylindrical concave curved surface are taken up, but the shape of the holding jigs 14 and 31 is not limited to this, and the holding jigs 14 and 31 are spherical as concave curved surfaces on which the imaging document 21 is placed. What has a concave curved surface can be used. In this way, it is not necessary to use the non-reflecting area of the illumination light due to the shadow of the housing 25, so it is not necessary to secure the housing size necessary for the document size, and the housing 25 can be downsized. . However, if the flat imaging document 21 is pressed against the spherical concave surface, wrinkles are likely to occur in the imaging document 21, and therefore the radius of curvature of the spherical concave surface needs to be determined within a range where a desired image can be obtained. In such a configuration, since the surface of the imaging document 21 held on the spherical concave surface faces the optical focus P of the imaging unit 11 in all directions, it is not necessary to use a spheroid as the housing 25. For example, a spherical thing can be used.

また、例えば、撮像部11として回転楕円体の形状を有するハウジング25を用いたものを取り上げたが、ハウジング25の形状はこれに限定されるものではない。ハウジング25の形状は、デジタルカメラ26を収容することができ、かつ、保持治具14,31の円筒凹曲面における弧状側面間長さLよりも長い影をその長さ方向においてマット部13の表面に作ることができる形状であればよい。そのようなハウジング25の形状としては、例えば、扁平楕円体や円柱等の形状であってもよい。また、ハウジング25として、デジタルカメラ26を傘のように覆う形状のものを用いることもできる。 Further, for example, it has been taken that using a housing 25 having a spheroidal shape as the imaging unit 11, the shape of the housing 25, have name limited thereto. The shape of the housing 25 can accommodate the digital camera 26, and a shadow longer than the length L between the arcuate side surfaces of the cylindrical concave curved surfaces of the holding jigs 14 and 31 is formed on the surface of the mat portion 13 in the length direction. not good if a shape that can be made. The shape of the housing 25 may be, for example, a flat ellipsoid or a cylinder. Further, the housing 25 may have a shape that covers the digital camera 26 like an umbrella.

さらに、保持治具14として、円筒凹曲面上の一方の直線状側面近傍にのみクリップ部15を備えた構造のものを取り上げたが、その変形例として、両方の直線状側面の近傍にクリップ部15を設けた構造としてもよい。このような構成とすることにより、例えば、撮像原稿21が硬質である場合やバネ性がある場合でも、撮像原稿21を確実に円筒凹曲面に密着させることができる。保持治具14の別の変形例として、両方の直線状側面の近傍にクリップ部15を設け、さらに一方の弧状側面近傍にも曲率に沿った湾曲クリップ部を設けて、撮像原稿21を3方向で保持する構造とすることも好ましい。この場合、撮像原稿21は、湾曲クリップ部が設けられていない方の弧状側面から挿入すればよい。   Further, as the holding jig 14, a structure having the clip portion 15 only in the vicinity of one linear side surface on the cylindrical concave curved surface has been taken up. As a modified example, the clip portion is provided in the vicinity of both linear side surfaces. 15 may be provided. By adopting such a configuration, for example, even when the imaging document 21 is hard or has a spring property, the imaging document 21 can be reliably brought into close contact with the cylindrical concave curved surface. As another modification of the holding jig 14, a clip portion 15 is provided in the vicinity of both linear side surfaces, and a curved clip portion along the curvature is also provided in the vicinity of one arcuate side surface so that the imaging document 21 is moved in three directions. It is also preferable that the structure is held by In this case, the imaging document 21 may be inserted from the arcuate side surface on which the curved clip portion is not provided.

なお、クリップ部15に透明な材料を使用すれば、撮像原稿21を押さえている部分についても画像を取得することができる。その場合、クリップ部15のサイズを大きめにできるので、より保持治具14に密着させることが可能となる。   Note that if a transparent material is used for the clip portion 15, an image can be acquired even for a portion where the imaging document 21 is pressed. In that case, since the size of the clip portion 15 can be increased, the clip portion 15 can be more closely attached to the holding jig 14.

保持治具14やハウジング25、デジタルカメラ26のサイズについては、また、曲率半径やその中心については、厳密に一致していなくても、本発明の効果を奏する範囲で略一致していれば足りることは言うまでも無い。   The sizes of the holding jig 14, the housing 25, and the digital camera 26, and the radius of curvature and the center thereof do not have to be exactly the same, but need only be approximately the same as long as the effects of the present invention are achieved. Needless to say.

本発明の一実施形態に係る非接触スキャナの概略構造を示す正面図である。It is a front view which shows schematic structure of the non-contact scanner which concerns on one Embodiment of this invention. 非接触スキャナの概略構造を示す平面図である。It is a top view which shows schematic structure of a non-contact scanner. 保持治具の概略構造を示す斜視図である。It is a perspective view which shows schematic structure of a holding jig. Y方向での撮像部の形状と照明光の入反射の関係を模式的に示す図である。It is a figure which shows typically the relationship between the shape of the imaging part in a Y direction, and the incident / reflection of illumination light. 本発明の一実施形態に係る非接触スキャナによる撮像手順を示すフローチャートである。It is a flowchart which shows the imaging procedure by the non-contact scanner which concerns on one Embodiment of this invention. 本発明の一実施形態に係る非接触スキャナに用いられる別の保持治具およびその周辺部の斜視図である。It is a perspective view of another holding jig used for the non-contact scanner concerning one embodiment of the present invention, and its peripheral part. 本発明の一実施形態に係る非接触スキャナに用いられる別のマット部の概略構造を示す断面である。It is a section showing the schematic structure of another mat part used for the non-contact scanner concerning one embodiment of the present invention.

符号の説明Explanation of symbols

10 非接触スキャナ
11 撮像部
12 支柱部
13 マット部
14 保持治具
15 クリップ部
16 突起部
17 穴部
18 マーカ
21 撮像原稿
25 ハウジング
26 デジタルカメラ
31 保持治具
32 マット部
33 吸着孔
34 減圧機構
DESCRIPTION OF SYMBOLS 10 Non-contact scanner 11 Image pick-up part 12 Support | pillar part 13 Mat | matte part 14 Holding jig 15 Clip part 16 Projection part 17 Hole part 18 Marker 21 Imaging document 25 Housing 26 Digital camera 31 Holding jig 32 Mat part 33 Suction hole 34 Decompression mechanism

Claims (7)

被撮像媒体を保持する凹曲面を備えた保持部材と、
前記保持部材に保持された前記被撮像媒体を撮像する撮像部と、
前記撮像部と前記保持部材との間を一定間隔で離間させる間隔保持部と、を具備し、
前記保持部材の前記凹曲面は円弧状の断面を有し、前記撮像部の光学的焦点から前記凹曲面に対し垂直に下ろした法線の長さが前記凹曲面の曲率半径と等しくなっていることを特徴とする非接触スキャナ。
A holding member having a concave curved surface for holding the imaging medium;
An imaging unit that images the imaged medium held by the holding member;
An interval holding unit that separates the imaging unit and the holding member at a constant interval, and
Said concave surface of said retaining member has an arcuate cross-section, the length of the normal line drawn perpendicular against the concave surface of the optical focal point of the imaging unit is equal to the radius of curvature of the concave surface A non-contact scanner characterized by that.
前記凹曲面は円筒凹曲面であることを特徴とする請求項1に記載の非接触スキャナ。   The non-contact scanner according to claim 1, wherein the concave curved surface is a cylindrical concave curved surface. 前記保持部材は保持治具であり、
前記保持治具が載置されるマット部をさらに具備し、
前記撮像部の上空から所定角度で前記保持治具に保持された前記被撮像媒体へ照明光が照射されている状態において、前記円筒凹曲面の弧状側面間の長さは、当該長さ方向における前記撮像部の前記マット部に写る影により生じる前記照明光の無反射領域の長さ以下であることを特徴とする請求項2に記載の非接触スキャナ。
The holding member is a holding jig;
It further comprises a mat portion on which the holding jig is placed,
In a state in which illumination light is applied to the imaging medium held by the holding jig at a predetermined angle from above the imaging unit, the length between the arc-shaped side surfaces of the cylindrical concave curved surface is in the length direction. The non-contact scanner according to claim 2, wherein the non-contact scanner has a length equal to or shorter than a length of a non-reflective area of the illumination light caused by a shadow reflected on the mat portion of the imaging unit.
前記マット部および前記保持治具は、前記保持治具を前記マット部に対して着脱自在とする着脱機構を具備することを特徴とする請求項3に記載の非接触スキャナ。   The non-contact scanner according to claim 3, wherein the mat portion and the holding jig include an attaching / detaching mechanism that allows the holding jig to be attached to and detached from the mat portion. 前記マット部の表面に前記保持治具の設置位置を示すマーカが印刷されていることを特徴とする請求項3または請求項4に記載の非接触スキャナ。   The non-contact scanner according to claim 3, wherein a marker indicating the installation position of the holding jig is printed on the surface of the mat portion. 前記保持治具は、前記被撮像媒体を押圧することにより、前記被撮像媒体を前記凹曲面に密着させる押圧部を具備することを特徴とする請求項1から請求項5のいずれか1項に記載の非接触スキャナ。   6. The holding jig according to claim 1, further comprising: a pressing unit that presses the imaging medium to bring the imaging medium into close contact with the concave curved surface. The non-contact scanner described. 被撮像媒体を保持する凹曲面を備えたマット部と、
前記マット部に保持された前記被撮像媒体を撮像する撮像部と、
前記撮像部と前記マット部との間を一定間隔で離間させる間隔保持部と、を具備し、
前記マット部の前記凹曲面は円弧状の断面を有し、前記撮像部の光学的焦点から前記凹曲面に対し垂直に下ろした法線の長さが前記凹曲面の曲率半径と等しくなっていることを特徴とする非接触スキャナ。
A mat portion having a concave curved surface for holding an image pickup medium;
An imaging unit for imaging the imaging medium held by the mat unit;
An interval holding unit that separates the imaging unit and the mat unit at regular intervals, and
Said concave surface of said mat portion has an arcuate cross-section, the length of the normal line drawn perpendicular against the concave surface of the optical focal point of the imaging unit is equal to the radius of curvature of the concave surface A non-contact scanner characterized by that.
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JPH06141141A (en) * 1992-10-23 1994-05-20 Hitachi Ltd Picture input device
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