JP5795948B2

JP5795948B2 - Lighting apparatus and imaging apparatus incorporating the same

Info

Publication number: JP5795948B2
Application number: JP2011257795A
Authority: JP
Inventors: 智則嶋田
Original assignee: Keyence Corp
Current assignee: Keyence Corp
Priority date: 2011-11-25
Filing date: 2011-11-25
Publication date: 2015-10-14
Anticipated expiration: 2031-11-25
Also published as: JP2013114808A

Description

本発明は照明器具及びこれを組み込んだ撮像装置に関する。 The present invention relates to a lighting fixture and an imaging apparatus incorporating the same.

ＣＣＤカメラなどの撮像装置が知られている。その一例が特許文献１に開示の視覚センサ装置であり、他の例が特許文献２の撮像装置である。特許文献１は、それまで別体であったＣＣＤカメラとＬＥＤ照明器具とを一体化することを提案している。特許文献２は、カメラのレンズホルダの前端にＬＥＤ基板を配置し、このＬＥＤ基板に数多くのＬＥＤを配置した撮像装置を開示している。 An imaging device such as a CCD camera is known. One example is the visual sensor device disclosed in Patent Document 1, and another example is the imaging device disclosed in Patent Document 2. Patent Document 1 proposes to integrate a CCD camera and an LED lighting apparatus, which have been separated until then. Patent Document 2 discloses an imaging apparatus in which an LED substrate is disposed at the front end of a lens holder of a camera, and a number of LEDs are disposed on the LED substrate.

照明装置に関して、特許文献３はドーム型照明器具を開示している。このドーム型照明器具は、乳白色のアクリル樹脂性のドームを有し、このドームは、その頂部にＣＣＤカメラや顕微鏡の鏡胴を挿入する挿入孔を有している。そして、ドームの湾曲した壁の全域に６０カ所の孔が形成され、各孔に多成分ガラス光ファイバ束の先端が固定されている。このドーム型照明器具は、新しい金属線、ワイヤ、メッキされた曲面の部品、レンズ、金属球、ハンダスポットなどの平滑な曲面を備え且つ表面反射率の高い対象物をその側面までＣＣＤカメラや顕微鏡で観察することができるという利点がある。 Regarding the lighting device, Patent Document 3 discloses a dome-shaped lighting fixture. This dome-shaped lighting fixture has a milky white acrylic resin dome, and this dome has an insertion hole for inserting a CCD camera or a microscope barrel. And 60 holes are formed in the whole area of the curved wall of the dome, and the tip of the multi-component glass optical fiber bundle is fixed to each hole. This dome-shaped luminaire has a smooth curved surface such as a new metal wire, wire, plated curved part, lens, metal ball, solder spot, etc., and an object with high surface reflectivity up to its side. There is an advantage that it can be observed.

特許文献４は、カメラを使って、内容物を充填したPETボトルの底部に沈殿する異物を検査する検査システムを開示している。この検査システムは、PETボトルの下方からPETボトルの底面及び底面回動部に向けてフレネルレンズを介して光を照射する下部照明と、PETボトルの上方からPETボトルに向けて光を照射する上部照明とを有している。上部照明は、下方に向けて開放したドーム型の反射鏡を有し、ドーム型反射鏡の下方に配置した光源から上方に向けて照射した光をドーム型反射鏡で反射することでPETボトルを上方から照明する。 Patent Document 4 discloses an inspection system that uses a camera to inspect foreign matter that settles on the bottom of a PET bottle filled with contents. This inspection system consists of a lower illumination that emits light through the Fresnel lens from the bottom of the PET bottle toward the bottom and bottom surface rotating parts of the PET bottle, and an upper part that emits the light from above the PET bottle toward the PET bottle. And lighting. The upper illumination has a dome-shaped reflecting mirror that opens downward, and reflects the light emitted upward from the light source placed below the dome-shaped reflecting mirror by the dome-shaped reflecting mirror. Illuminate from above.

特開平１０−３２０５３８号公報Japanese Patent Laid-Open No. 10-320538 特開２００７−２１４６８２号公報JP 2007-214682 A 実開平６−６０８０２号公報Japanese Utility Model Publication No. 6-60802 特開２０１０−６０３１２号公報JP 2010-60312 A

照明光は照射する光にベクトルを有し、対象物を観察するときにこの対象物の種類によっては、局部的にその見え方が悪化するという問題を有している。例えば、フィルムで覆われたお菓子を観察する場合、照射する光にベクトルがあると内容物であるお菓子を観察し難くなる。照明光の光源がＬＥＤの場合には、ＬＥＤの特性からその傾向が強くなる。また、照明器具に配置したＬＥＤの数を少なくすると観察領域が局部的に見え難くなるという問題が発生する。この場合にも光源がＬＥＤの場合には、その傾向が強くなる。 The illumination light has a vector in the irradiated light, and when observing the object, there is a problem that depending on the type of the object, the appearance is locally deteriorated. For example, when observing a candy covered with a film, it is difficult to observe the confectionery as the contents if there is a vector in the irradiated light. In the case where the light source of the illumination light is an LED, the tendency is strong due to the characteristics of the LED. Further, if the number of LEDs arranged in the lighting fixture is reduced, there arises a problem that it becomes difficult to see the observation region locally. Also in this case, when the light source is an LED, the tendency becomes stronger.

本発明の目的は、ベクトルを極力小さくした光を対象物に照射することのできる照明器具及びこれを組み込んだ撮像装置を提供することにある。 An object of the present invention is to provide a lighting fixture capable of irradiating an object with light having a vector as small as possible, and an imaging apparatus incorporating the same.

本発明の更なる目的は、少ない数のＬＥＤで観察領域を万遍なく照射することのできる照明器具及びこれを組み込んだ撮像装置を提供することにある。 A further object of the present invention is to provide a lighting fixture that can uniformly illuminate an observation region with a small number of LEDs and an imaging apparatus incorporating the same.

上記の技術的課題は、本発明の一つの観点によれば、基本的には、
検査対象物を撮像する撮像部と、該撮像部により観察される観察領域を照明するための光源とを有する撮像装置に取り付けられ、該光源からの光を後端部から取り入れて、光の反射を繰り返しながら前端部から該撮像部の観察領域に光を照射する照明器具であって、
前記後端部から前記前端部に向けて拡開した輪郭形状を有し、前記後端部に位置する入口から入った光を反復的に反射させながら前記前端部側に向けて誘導する光反射通路と、
該光反射通路の出口に対面して配置され、該光反射通路から出た光を前記後端部側に向けて反射し且つ前記前端部の周方向に延びる第１の反射面と、
前記光反射通路の内側に位置し且つ前記撮像部の観察領域に向けて徐々に拡開して前記撮像部の観察領域に向けて開放した第２の反射面とを有し、
前記第１の反射面で反射した光を前記第２の反射面で反射することにより、前記第１の反射面の径方向内側の出口から前記撮像部の観察領域に向けて光を照射することを特徴とする照明器具を提供することにより達成される。 The above technical problem is basically according to one aspect of the present invention.
It is attached to an imaging device having an imaging unit for imaging an inspection object and a light source for illuminating an observation area observed by the imaging unit, and takes light from the light source from the rear end part to reflect light. A lighting fixture that irradiates light from the front end to the observation area of the imaging unit while repeating
Light reflection that has a contour shape that expands from the rear end portion toward the front end portion and guides light entering from the entrance located at the rear end portion toward the front end portion while repeatedly reflecting light. A passage,
A first reflecting surface disposed facing the outlet of the light reflecting passage, reflecting light emitted from the light reflecting passage toward the rear end portion and extending in a circumferential direction of the front end portion;
A second reflecting surface located inside the light reflection path and gradually expanding toward the observation region of the imaging unit and opened toward the observation region of the imaging unit;
The light reflected by the first reflecting surface is reflected by the second reflecting surface, thereby irradiating the light from the radially inner exit of the first reflecting surface toward the observation region of the imaging unit. This is achieved by providing a lighting fixture characterized by:

上記の技術的課題は、本発明の他の観点によれば、基本的には、
検査対象物を撮像する撮像部と、該撮像部により観察される観察領域を照明するための光源とを有する撮像装置に取り付けられ、該光源からの光を取り込む光取込口と、該光取込口から取り込まれた光を反射させながら誘導する光反射通路と、該光反射通路により誘導された光を外部に照射する光照射口とを有する照明器具であって、
前記光取込口が設けられた後端部と、
前記光反射通路の出口が設けられ且つ該後端部よりも拡開した前端部と、
該後端部と前記前端部との間に位置し、内部に前記光反射通路が形成された光誘導部と、
前記前端部に設けられた前記光反射通路の出口に対面して配置され、前記光反射通路から出た光を前記後端部に向けて後方に反射する第１の反射部と、
前記第１の反射部にて反射した光を、前記第１の反射部の径方向内側に形成された前記光照射口に向けて前方に反射する第２の反射部とを有し、
前記後端部には、前記撮像装置に前記照明器具が取り付けられた際に前記撮像部の光軸を通過させるための観察通路が形成されていることする特徴とする照明器具を提供することにより達成される。 The above technical problem is basically according to another aspect of the present invention.
A light intake port that is attached to an imaging device having an imaging unit that images an inspection object and a light source for illuminating an observation region observed by the imaging unit, and that takes in light from the light source; A light fixture having a light reflection path that guides light reflected from a light inlet while reflecting the light guided by the light reflection path to the outside,
A rear end provided with the light inlet;
A front end provided with an outlet of the light reflection passage and wider than the rear end;
A light guiding portion located between the rear end portion and the front end portion, and having the light reflection path formed therein;
A first reflecting portion that is arranged to face an outlet of the light reflecting passage provided at the front end portion, and reflects light emitted from the light reflecting passage backward toward the rear end portion;
A second reflecting portion that reflects light reflected by the first reflecting portion forwardly toward the light irradiation port formed radially inside the first reflecting portion;
By providing an illuminating device, wherein the rear end portion is formed with an observation passage for allowing the optical axis of the imaging unit to pass through when the illuminating device is attached to the imaging device. Achieved.

本発明の典型例は、光源を含む撮像装置に上述した照明器具が取り付けられる。光源の典型例としてＬＥＤを挙げることができる。 In a typical example of the present invention, the above-described lighting fixture is attached to an imaging apparatus including a light source. A typical example of the light source is an LED.

本発明の他の目的、作用効果は、本発明の好ましい実施形態の詳しい説明から明らかになろう。 Other objects and advantages of the present invention will become apparent from the detailed description of the preferred embodiments of the present invention.

カメラと照明の光源としての４つのＬＥＤとを内蔵した撮像装置に装着した照明アタッチメントの側面図である。It is a side view of the illumination attachment with which the imaging device with which the camera and four LED as a light source of illumination were incorporated was mounted | worn. 図１の撮像装置に装着した照明アタッチメントの正面図である。It is a front view of the illumination attachment with which the imaging device of FIG. 1 was mounted | worn. 撮像装置と照明アタッチメントとが分離した状態の図であり、斜め後方から見た斜視図である。It is the figure of the state which the imaging device and the illumination attachment isolate | separated, and is the perspective view seen from diagonally back. 撮像装置の分解斜視図である。It is a disassembled perspective view of an imaging device. 実施例の照明アタッチメントを斜め前方から見た分解斜視図である。It is the disassembled perspective view which looked at the illumination attachment of the Example from diagonally forward. 実施例の照明アタッチメントを斜め後方から見た分解斜視図である。It is the disassembled perspective view which looked at the illumination attachment of the Example from diagonally backward. 実施例の照明アタッチメントの縦断面図である。It is a longitudinal cross-sectional view of the illumination attachment of an Example. 撮像装置と、これに組み付けた照明アタッチメントとの連結部分の断面図である。It is sectional drawing of the connection part of an imaging device and the illumination attachment assembled | attached to this. 照明アタッチメントの第１変形例を説明するための断面図である。It is sectional drawing for demonstrating the 1st modification of an illumination attachment. 照明アタッチメントの第２変形例を説明するための断面図である。It is sectional drawing for demonstrating the 2nd modification of an illumination attachment. 本発明の概念構成図である。It is a conceptual block diagram of this invention.

以下に、添付の図面に基づいて本発明の好ましい実施例を説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

図１はＣＣＤカメラを内蔵した撮像装置に脱着自在に組み付けた照明アタッチメントを示す側面図であり、図２は撮像装置の前端に組み付けた照明アタッチメントの正面図である。図１を参照して、参照符号１は撮像装置を示し、その先端部（図１では下端部）に、同一の円周上に配置した４つのＬＥＤを備えた内蔵照明ユニット２０６が一体的に組み付けられている。この４つのＬＥＤを図２において参照符号４で示してある。 FIG. 1 is a side view showing an illumination attachment that is detachably attached to an image pickup apparatus incorporating a CCD camera, and FIG. 2 is a front view of the illumination attachment attached to the front end of the image pickup apparatus. Referring to FIG. 1, reference numeral 1 denotes an imaging device, and a built-in lighting unit 206 having four LEDs arranged on the same circumference is integrally formed at a tip portion (lower end portion in FIG. 1). It is assembled. These four LEDs are denoted by reference numeral 4 in FIG.

図３は、後方（撮像装置１側）から見た撮像装置１と照明アタッチメントとの分解斜視図である。撮像装置1の前端部を構成する内蔵照明ユニット２０６は円筒形状を有する。他方、撮像装置１に脱着自在に組み付けられる照明アタッチメント６は、その後端に円筒状の連結スリーブ８を有している。この連結スリーブ８は前述した撮像装置の断面円形の内蔵照明ユニット２０６の直径と実質的に同じ内径を有する。内蔵照明ユニット２０６に連結スリーブ８を嵌合させると共に、連結スリーブ８に形成されている４つの貫通孔８ａに挿入されるネジ（図示せず）を使って照明アタッチメント６を撮像装置1の内蔵照明ユニット２０６に固定することによって、照明アタッチメント６が撮像装置１に一体化される。 FIG. 3 is an exploded perspective view of the imaging device 1 and the illumination attachment as viewed from the rear (imaging device 1 side). The built-in illumination unit 206 constituting the front end portion of the imaging device 1 has a cylindrical shape. On the other hand, the illumination attachment 6 detachably assembled to the imaging device 1 has a cylindrical connecting sleeve 8 at the rear end. The connecting sleeve 8 has an inner diameter substantially the same as the diameter of the built-in illumination unit 206 having a circular cross section of the imaging device described above. The connecting sleeve 8 is fitted into the built-in lighting unit 206, and the lighting attachment 6 is attached to the built-in lighting of the imaging device 1 by using screws (not shown) inserted into four through holes 8a formed in the connecting sleeve 8. By fixing to the unit 206, the illumination attachment 6 is integrated with the imaging device 1.

照明アタッチメント６を説明する前に、この照明アタッチメント６が取り付けられる撮像装置１の概要を図４を参照して説明する。図４は撮像装置１を斜め前方から見た分解斜視図である。撮像装置１は、エンド部材２００を含むＣＭＯＳカメラユニット２０２及びレンズユニット２０４（フォーカス自動調整機能付き）と、内蔵照明ユニット２０６、複数の基板２０８と、前端止めリング２１０とを有する。撮像装置１のケース２１２は、その後側でＣＭＯＳカメラユニット２０２及びレンズユニット２０４を包囲するケースを構成している。ケース２１２は、また、その前端部に内蔵照明ユニット２０６を収容するためのケースを構成している。 Before describing the illumination attachment 6, an outline of the imaging device 1 to which the illumination attachment 6 is attached will be described with reference to FIG. 4. FIG. 4 is an exploded perspective view of the imaging device 1 as viewed obliquely from the front. The imaging apparatus 1 includes a CMOS camera unit 202 and a lens unit 204 (with an automatic focus adjustment function) including an end member 200, a built-in illumination unit 206, a plurality of substrates 208, and a front end stop ring 210. The case 212 of the imaging apparatus 1 constitutes a case that surrounds the CMOS camera unit 202 and the lens unit 204 on the rear side. The case 212 also constitutes a case for housing the built-in lighting unit 206 at the front end thereof.

図４に見られる参照符号２１６は円筒状の鏡筒を示す。鏡筒２１６はケース２１２の前端部分の中央に形成され、この鏡筒２１６を通じて撮像視野領域の反射光がレンズユニット２０４、ＣＭＯＳカメラユニット２０２に導かれる。この鏡筒２１６の周囲にはリング状の凹所２１８が形成されている。上述した内蔵照明ユニット２０６は中央開口２０６ａを有し、この中央開口２０６ａを鏡筒２１６が貫通した状態で内蔵照明ユニット２０６が凹所２１８に位置決めされる。内蔵照明ユニット２０６は前端カバー２３０で覆われる。 Reference numeral 216 seen in FIG. 4 indicates a cylindrical barrel. The lens barrel 216 is formed at the center of the front end portion of the case 212, and reflected light in the imaging visual field region is guided to the lens unit 204 and the CMOS camera unit 202 through the lens barrel 216. A ring-shaped recess 218 is formed around the lens barrel 216. The built-in lighting unit 206 described above has a central opening 206a, and the built-in lighting unit 206 is positioned in the recess 218 with the lens barrel 216 passing through the central opening 206a. The built-in lighting unit 206 is covered with a front end cover 230.

撮像装置１は、内蔵照明ユニット２０６を動作させて撮像視野領域を照明しながら検査対象物を撮像し、そして撮像データの画像処理を実行して、その結果を出力する。内蔵照明ユニット２０６は、照明用のレンズ本体２２０とリフレクタ本体２２２とＬＥＤ基板２２４の３つの構成要素で構成され、ＬＥＤ基板２２４に前述したＬＥＤ４(図１)が配設されている。照明用のレンズ本体２２０は、その前面と後面にトロイダルレンズ２２０ａが形成され、各トロイダルレンズ２２０ａはＬＥＤに対応した位置に配置されている。撮像装置１は、内蔵照明ユニット２０６を動作させて撮像視野領域を照明しながら検査対象物を撮像し、そして撮像データの画像処理を実行して、その結果を出力する。 The imaging apparatus 1 operates the built-in illumination unit 206 to image the inspection object while illuminating the imaging visual field region, executes image processing of the imaging data, and outputs the result. The built-in illumination unit 206 includes three components, that is, an illumination lens body 220, a reflector body 222, and an LED substrate 224, and the LED 4 (FIG. 1) described above is disposed on the LED substrate 224. The illumination lens body 220 has toroidal lenses 220a formed on the front and rear surfaces thereof, and each toroidal lens 220a is disposed at a position corresponding to the LED. The imaging apparatus 1 operates the built-in illumination unit 206 to image the inspection object while illuminating the imaging visual field region, executes image processing of the imaging data, and outputs the result.

図５〜図６は実施例の照明アタッチメント６を示す図である。図５、図６は照明アタッチメント６の分解斜視図であり、図５は照明アタッチメント６を前方から見た図であり、図６は照明アタッチメントを後方から見た図である。図５、図６を参照して、照明アタッチメント６は、アウター１０と、インナー１２と、前端反射リング部材１４との３つの部材で構成され、アウター１０の中にインナー１２を入れた後に、周方向に連続して延びる前端反射リング部材１４の外周縁部をネジＳ(図３)でアウター１０の開口縁部に固定することによって組み立てられる。アウター１０及びインナー１２は共に前方に向けて拡開したドームの外形形状を有している。そして、アウター１０とインナー１２とは全周に亘って同じ間隔に離間して位置決めされている。 5-6 is a figure which shows the illumination attachment 6 of an Example. 5 and 6 are exploded perspective views of the illumination attachment 6. FIG. 5 is a view of the illumination attachment 6 as viewed from the front. FIG. 6 is a view of the illumination attachment as viewed from the rear. Referring to FIGS. 5 and 6, the illumination attachment 6 includes three members, an outer 10, an inner 12, and a front end reflection ring member 14, and after the inner 12 is put into the outer 10, It is assembled by fixing the outer peripheral edge portion of the front end reflection ring member 14 extending continuously in the direction to the opening edge portion of the outer 10 with a screw S (FIG. 3). Both the outer 10 and the inner 12 have an outer shape of a dome that expands forward. The outer 10 and the inner 12 are positioned at the same interval over the entire circumference.

図７は、撮像装置１に照明アタッチメント６を組み付けた状態を示す図であり、図８は、照明アタッチメント６と撮像装置１の位置関係を示す縦断面図（一部模式図）である。この図８は、撮像装置１に内蔵されたＣＭＯＳカメラユニット２０２及びレンズユニット２０４並びにＬＥＤ４（内蔵照明ユニット２０６）の配置関係の概略が分かるように、内部構造を模式的に示している。実施例の撮像装置１は、上述したように、ＣＭＯＳカメラユニット２０２及びレンズユニット２０４（の全部又は一部）を収容するケース２１２を有し、このケース２１２の前方部分に内蔵照明ユニット２０６が位置決めされている。内蔵照明ユニット２０６の複数のＬＥＤ４は、実質的にＣＭＯＳカメラユニット２０２の撮像素子の光軸の周りに配置され、ＣＭＯＳカメラユニット２０２により撮像される撮像領域に向けて光を照射する。レンズユニット２０４は、前述したように、ＣＭＯＳカメラユニット２０２のフォーカス位置を調整するためのフォーカス調整機構を有し、ＣＭＯＳカメラユニット２０２とＬＥＤ基板２２４との間に配置されている。 FIG. 7 is a diagram illustrating a state in which the illumination attachment 6 is assembled to the imaging device 1, and FIG. 8 is a longitudinal sectional view (partially schematic diagram) illustrating a positional relationship between the illumination attachment 6 and the imaging device 1. FIG. 8 schematically shows the internal structure so that an outline of the arrangement relationship of the CMOS camera unit 202, the lens unit 204, and the LED 4 (built-in illumination unit 206) built in the imaging apparatus 1 can be understood. As described above, the imaging apparatus 1 according to the embodiment includes the case 212 that houses the CMOS camera unit 202 and the lens unit 204 (all or a part thereof), and the built-in lighting unit 206 is positioned in the front portion of the case 212. Has been. The plurality of LEDs 4 of the built-in illumination unit 206 are arranged substantially around the optical axis of the image sensor of the CMOS camera unit 202, and irradiate light toward the imaging region imaged by the CMOS camera unit 202. As described above, the lens unit 204 has a focus adjustment mechanism for adjusting the focus position of the CMOS camera unit 202, and is disposed between the CMOS camera unit 202 and the LED substrate 224.

また、内蔵照明ユニット２０６は、ケース２１２の前方部分に形成された鏡筒２１６（換言すれば、円筒状の筒部）に貫通されて鏡筒２１６の周囲に配置されている。他方、鏡筒２１６の内部通路（観察通路２２：図７）をＣＭＯＳカメラユニット２０２の撮像素子の光軸が通る。鏡筒２１６は撮像装置１の先端部分まで延びることによって、撮像装置１に照明アタッチメント６が取り付けられたときＬＥＤ４の光が撮像装置１内で鏡筒２１６の内部に直接的に侵入するのを防いでいる。 The built-in illumination unit 206 is disposed around the lens barrel 216 through a lens barrel 216 (in other words, a cylindrical tube portion) formed in the front portion of the case 212. On the other hand, the optical axis of the image sensor of the CMOS camera unit 202 passes through the internal passage (observation passage 22: FIG. 7) of the lens barrel 216. The lens barrel 216 extends to the distal end portion of the imaging device 1, thereby preventing light from the LED 4 from directly entering the interior of the lens barrel 216 in the imaging device 1 when the illumination attachment 6 is attached to the imaging device 1. It is out.

図７を参照して、互いに離間して配置されたアウター１０とインナー１２との間つまりアウター１０の内面１０ａとインナー１２ａの外面１２ａとの間に円周方向に延び且つアウター１０の高さ方向つまり拡開方向に伸びる通路Ｐが形成されている。この通路Ｐは、光源つまりＬＥＤ４が発した光を照明アタッチメント６の先端に向けて反射を繰り返しながら誘導する光反射通路を構成する。この光反射通路Ｐは、アウター１０とインナー１２とで外形輪郭が前端に向けて拡開し且つ外方に向けて凸形状に湾曲したドーム形状を有している。 With reference to FIG. 7, the outer 10 extends in the circumferential direction between the outer 10 and the inner 12 that are spaced apart from each other, that is, between the inner surface 10 a of the outer 10 and the outer surface 12 a of the inner 12 a, and the height direction of the outer 10. That is, a passage P extending in the expanding direction is formed. This passage P constitutes a light reflection passage that guides light emitted from the light source, that is, the LED 4, while repeatedly reflecting the light toward the tip of the illumination attachment 6. The light reflection path P has a dome shape in which the outer contour of the outer 10 and the inner 12 is expanded toward the front end and curved outwardly.

光反射通路Ｐは実施例のように空間で構成してもよいし、中実の例えば光透過性樹脂で構成してもよい。光反射通路Ｐの外壁面及び／又は内壁面つまりアウター１０の内面１０ａとインナー１２の外面１２ａのいずれか一方、好ましくは双方の表面性状が光を散乱させる機能を有しているのがよく、このことは例えばアウター１０の内面１０ａ及び/又はインナー１２の外面１２ａに、例えば光を散乱させることのできる塗料を塗布することにより実現することができる。光反射通路Ｐの外壁面及び／又は内壁面の性状に光散乱機能を付加することは、実施例のように数少ないＬＥＤ４の光源の場合に効果的である。光拡散機能を付与する手段として、例えば光反射機能付き樹脂を挙げることができる。この実施例では数少ない光源（ＬＥＤ４）を前提として光拡散機能を付与してあるが、数多い光源に対しては光反射通路Ｐの外壁面及び／又は内壁面は鏡面であってもよい。 The light reflection path P may be constituted by a space as in the embodiment, or may be constituted by a solid light-transmitting resin, for example. Either the outer wall surface and / or the inner wall surface of the light reflection path P, that is, the inner surface 10a of the outer 10 and the outer surface 12a of the inner 12, preferably both surface properties have a function of scattering light, This can be realized, for example, by applying a paint capable of scattering light, for example, to the inner surface 10a of the outer 10 and / or the outer surface 12a of the inner 12. Adding a light scattering function to the properties of the outer wall surface and / or inner wall surface of the light reflection path P is effective in the case of a few LED4 light sources as in the embodiment. As a means for imparting a light diffusion function, for example, a resin with a light reflection function can be cited. In this embodiment, the light diffusing function is provided on the premise of few light sources (LEDs 4). However, for many light sources, the outer wall surface and / or inner wall surface of the light reflection path P may be a mirror surface.

前述した前端反射リング部材１４は、その外周縁部がアウター１０の前端つまり開放端に連結されて径方向内方且つ周方向に延びる形状を有し、前端反射リング部材１４の内周縁は、照明アタッチメント６から観察領域に向けて光を照射する円形輪郭の光照射口１８を形成している。前端反射リング部材１４は、この実施例では、前端反射リング部材１４の内面で構成される反転反射面１４ａが照明アタッチメント６の後端つまりＬＥＤ４の光を取り入れる入口１６側に向けて凹形状に湾曲した曲面の形状を有し、光反射通路Ｐから出た光をインナー１２の深部つまり入口１６側に向けて光を反射する。前端反射リング部材１４の内面つまり反転反射面１４ａも好ましくは光拡散機能を備えているのがよい。 The aforementioned front end reflecting ring member 14 has a shape in which the outer peripheral edge thereof is connected to the front end of the outer 10, that is, the open end, and extends radially inward and circumferentially. A light irradiation port 18 having a circular contour for irradiating light from the attachment 6 toward the observation region is formed. In this embodiment, the front reflection ring member 14 has a reverse reflection surface 14a formed by the inner surface of the front reflection ring member 14 and is curved in a concave shape toward the rear end of the illumination attachment 6, that is, the entrance 16 side for taking in the light of the LED 4. The light reflected from the light reflection path P is reflected toward the deep part of the inner 12, that is, the inlet 16 side. The inner surface of the front end reflection ring member 14, that is, the reverse reflection surface 14a is also preferably provided with a light diffusion function.

ここで、この反転反射面１４ａは、インナー１２の前端部より径方向内側へ突出し、且つ、照明アタッチメント６の前端部の周方向に延びるフランジ部の一部として機能する。光反射通路Ｐから出た光は、この反転反射面１４ａによって後方（図７でいうと上方）に反射される。このように、径方向内側へ突出したフランジ部を設けることによって、光反射通路Ｐから出た光をより確実に（前方への光の漏れを少なくしつつ）後方に反射することができる。 Here, the reverse reflection surface 14 a functions as a part of a flange portion that protrudes radially inward from the front end portion of the inner 12 and extends in the circumferential direction of the front end portion of the illumination attachment 6. The light emitted from the light reflection path P is reflected backward (upward in FIG. 7) by the reverse reflection surface 14a. As described above, by providing the flange portion protruding radially inward, the light emitted from the light reflection path P can be reflected more reliably (while reducing the leakage of light forward).

インナー１２の内面１２ｂは、前端反射リング部材１４の反転反射面１４ａからの光を反射させて光照射口１８から観察領域に向けて照明する機能を有し、好ましい形状として前端つまり光照射口１８側に向けて徐々に拡開した湾曲形状を有している。 The inner surface 12b of the inner 12 has a function of reflecting light from the reverse reflection surface 14a of the front end reflection ring member 14 and illuminating the light irradiation port 18 toward the observation region. It has a curved shape that gradually expands toward the side.

図７及び図８を参照して、インナー１２の頂部には軸線方向に延びる断面円形のスリーブ（観察筒）２０が一体的に形成されており、このスリーブ（観察筒）２０によって観察通路２２が形成され、この観察通路２２を通じて対象物からの反射光が撮像装置１に入力される。より具体的に説明すると、撮像装置１に照明アタッチメント６が取り付けられたとき、上述した鏡筒２１６（図４、図７、図８）の内部通路と、インナー１２の後端部分に形成されたスリーブ（観察筒）２０内部の観察通路２２とが、略一直線上に位置決めされる。つまり、鏡筒２１６の内部通路の径方向の大きさ（鏡筒２１６の内径）と観察通路２２の径方向の大きさ（観察筒２０の内径）とが、実質的に同じ且つ同軸に位置するように構成されている。これにより、撮像装置１から照明アタッチメント６内に入射されたＬＥＤ４の光が、観察通路２２に直接入り込むのを防いでいる。つまり、内蔵照明ユニット２０６（ＬＥＤ４）から出射された光は、光反射通路Ｐに侵入することなく鏡筒２１６の内部通路及び観察筒（スリーブ）２０の観察通路２２に直接入り込めないようになっている。また、ＬＥＤ４からの光を取り込む光取込口（図１１において後述する光取込口１１２に相当）は、観察筒２０の観察通路２２の入口と同一平面上に形成され、且つ、撮像素子の光軸周りにＬＥＤ４からの光を全て取り込むように構成されている。本実施例の場合、上述したように、ＬＥＤ４が載置されたＬＥＤ基板が円環形状となっていることから、光取込口も円環形状を呈している。撮像装置１に付設されたＬＥＤ４の光は、アウター１０の後端とインナー１２の後端との間の円周方向に延びる隙間つまり入口１６を通じて光反射通路Ｐに入り込む。このとき、光取込口を通過した光は、撮像装置１の光軸方向に対して略４５度傾いたスリーブ（観察筒）２０に反射して、光反射通路Ｐに誘導される。このスリーブ２０があることによって、光取込口を通過した光を効率的に光反射通路Ｐに誘導することができる。そして光反射通路Ｐを通過する過程でアウター１０の内面１０ａとインナー１２の外面１２ｂとで反射を繰り返す毎に散乱して光のベクトルを分割、増加させながら、光反射通路Ｐから出る。図７の矢印は光の反射例を示しているが、この矢印は説明のために図示したに過ぎない。 Referring to FIGS. 7 and 8, a sleeve (observation tube) 20 having a circular cross section extending in the axial direction is integrally formed at the top of the inner 12, and an observation passage 22 is formed by the sleeve (observation tube) 20. The reflected light from the object is input to the imaging device 1 through the observation path 22. More specifically, when the illumination attachment 6 is attached to the imaging device 1, it is formed in the inner passage of the above-described lens barrel 216 (FIGS. 4, 7, and 8) and the rear end portion of the inner 12. The observation passage 22 inside the sleeve (observation tube) 20 is positioned on a substantially straight line. That is, the radial size of the internal passage of the lens barrel 216 (inner diameter of the lens barrel 216) and the radial size of the observation passage 22 (inner diameter of the observation tube 20) are substantially the same and coaxial. It is configured as follows. Thereby, the light of the LED 4 incident on the illumination attachment 6 from the imaging device 1 is prevented from directly entering the observation path 22. That is, the light emitted from the built-in illumination unit 206 (LED 4) does not directly enter the internal passage of the lens barrel 216 and the observation passage 22 of the observation tube (sleeve) 20 without entering the light reflection passage P. ing. In addition, a light intake port (corresponding to a light intake port 112 described later in FIG. 11) for taking in light from the LED 4 is formed on the same plane as the entrance of the observation path 22 of the observation tube 20 and the image pickup device. It is configured to capture all the light from the LED 4 around the optical axis. In the case of the present embodiment, as described above, since the LED substrate on which the LEDs 4 are mounted has an annular shape, the light intake port also has an annular shape. The light of the LED 4 attached to the imaging device 1 enters the light reflection path P through a gap extending in the circumferential direction between the rear end of the outer 10 and the rear end of the inner 12, that is, the inlet 16. At this time, the light that has passed through the light intake port is reflected by the sleeve (observation tube) 20 inclined by about 45 degrees with respect to the optical axis direction of the imaging device 1 and guided to the light reflection path P. With the sleeve 20, the light that has passed through the light intake port can be efficiently guided to the light reflection path P. Then, in the process of passing through the light reflection path P, each time reflection is repeated on the inner surface 10a of the outer 10 and the outer surface 12b of the inner 12, the light exits from the light reflection path P while dividing and increasing the light vector. The arrow in FIG. 7 shows an example of light reflection, but this arrow is only shown for explanation.

光反射通路Ｐから出た光は、この光反射通路Ｐの出口１７に臨んで配置され且つ円周方向に延びる前端反射リング部材１４の反転反射面１４ａで反射してインナー１２の内側空間の深部に向かう。次いで、このインナー１２の内面１２ｂで反射して照明アタッチメント６の照射口１８を通じて観察領域を照明することになる。インナー１２の内面１２ｂは鏡面仕上げされていてもよいが、この実施例では光拡散機能を有しており、このインナー１２の内面１２ｂでも光の拡散が行われる。 The light emitted from the light reflection path P is reflected by the reverse reflection surface 14a of the front end reflection ring member 14 arranged facing the outlet 17 of the light reflection path P and extending in the circumferential direction, and is deep in the inner space of the inner 12 Head for. Next, the observation area is illuminated through the irradiation port 18 of the illumination attachment 6 after being reflected by the inner surface 12 b of the inner 12. The inner surface 12b of the inner 12 may be mirror-finished, but in this embodiment, it has a light diffusing function, and the inner surface 12b of the inner 12 also diffuses light.

上記のように、撮像装置１の少ない数の光源であるＬＥＤ４が発した光は、照明アタッチメント１０を経由することで、そのベクトルが複数に分割され、拡散光によって観察領域を万遍なく照明することができる。したがって、対象物がフィルムで覆われたお菓子、メッキされた曲面の部品、レンズなどであっても撮像装置１で適切に撮像することができる。 As described above, the light emitted from the LED 4 that is a small number of light sources of the imaging device 1 passes through the illumination attachment 10, so that the vector is divided into a plurality of parts, and the observation area is illuminated uniformly by the diffused light. be able to. Therefore, even if the target object is a candy covered with a film, a plated curved part, a lens, or the like, it can be appropriately imaged by the imaging device 1.

以上、本発明の好ましい実施例を説明したが、本発明はこの実施例に限定されないのは言うまでもない。図９、図１０は変形例を示す。図９の照明アタッチメント３０は、アウター１０の内面１０ａが直線状に延びる平面で構成され、また、インナー１２の外面１２ａ、内面１２ｂも直線状に延びる平面で構成されている。図１０の照明アタッチメント４０は、アウター１０の内面１０ａが角を備えた２つの互いに交差する平面で構成され、また、インナー１２の外面１２ａ、内面１２ｂも角を備えた２つの互いに交差する平面で構成され、更に前端反射リング部材１４の反転反射面１４ａも平面で構成されている。 As mentioned above, although the preferable Example of this invention was described, it cannot be overemphasized that this invention is not limited to this Example. 9 and 10 show a modification. The illumination attachment 30 of FIG. 9 is configured by a plane in which the inner surface 10a of the outer 10 extends linearly, and the outer surface 12a and the inner surface 12b of the inner 12 are also configured by planes extending linearly. The illumination attachment 40 in FIG. 10 is configured by two mutually intersecting planes with the inner surface 10a of the outer 10 having corners, and the outer surface 12a and the inner surface 12b of the inner 12 are also two mutually intersecting planes having corners. Further, the reverse reflection surface 14a of the front end reflection ring member 14 is also a flat surface.

このようにアウター１０の内面１０ａ、インナー１２の外面１２ａ、内面１２ｂ、前端反射リング部材１４の反転反射面１４ａは、いずれも湾曲した面で構成しても良いし、角の有無を問わず平面で構成しても良い。例えば図９、図１０のインナー１２の内面１２ｂを前述した実施例のインナー１２（図７）の内面１２ｂのように湾曲した面で構成してもよい。 As described above, the inner surface 10a of the outer 10, the outer surface 12a, the inner surface 12b of the inner 12, and the reverse reflection surface 14a of the front end reflection ring member 14 may all be formed of curved surfaces, and may be flat with or without corners. You may comprise. For example, the inner surface 12b of the inner 12 shown in FIGS. 9 and 10 may be constituted by a curved surface like the inner surface 12b of the inner 12 (FIG. 7) of the above-described embodiment.

図７〜図１０を参照して、光誘導部の後端部と前端部とでは、前端部の径の方が大きい。具体的に説明すると、図７に示すインナー１２（またはアウター１０）の前端部により形成される光照射口１８の径（開口面積）は、図７に示す連結スリーブ８の開口の径（開口面積）よりも大きい。また、図９においても図１０においても同様に、光誘導部となるインナー１２（またはアウター１０）の前端部により形成される光照射口１８の径（開口面積）は、連結スリーブ８の開口の径（開口面積）よりも大きい。このように、光誘導部の前端部は、後端部よりも拡開しているといえる。これにより、光反射通路Ｐにて光が反射する距離、すなわちベクトルを分割して光を散乱光に近づけるための距離をかせぐことができる。 With reference to FIGS. 7 to 10, the diameter of the front end portion is larger between the rear end portion and the front end portion of the light guiding portion. More specifically, the diameter (opening area) of the light irradiation port 18 formed by the front end portion of the inner 12 (or outer 10) shown in FIG. 7 is the diameter (opening area) of the connection sleeve 8 shown in FIG. Bigger than). Similarly in FIGS. 9 and 10, the diameter (opening area) of the light irradiation port 18 formed by the front end portion of the inner 12 (or outer 10) serving as the light guiding portion is equal to the opening of the connecting sleeve 8. It is larger than the diameter (opening area). Thus, it can be said that the front end portion of the light guiding portion is wider than the rear end portion. As a result, it is possible to increase the distance at which the light is reflected by the light reflection path P, that is, the distance for dividing the vector and bringing the light closer to the scattered light.

「前端部」と「後端部」について、図１１に示す概念図を用いて説明する。図１１は、本発明の実施例に係る照明アタッチメント１００の概念図を示す図である。図１１に示す照明アタッチメント１００は、ワークＷの外観検査に用いられるものであって、凹凸による影やフィルムによるハレーションに起因して外観検査が困難なワークＷを判別するためのものである（例えばアルミ包材上の印字などを透明フィルム越しに判別する等）。 The “front end” and “rear end” will be described with reference to the conceptual diagram shown in FIG. FIG. 11 is a diagram illustrating a conceptual diagram of the illumination attachment 100 according to the embodiment of the present invention. The illumination attachment 100 shown in FIG. 11 is used for the appearance inspection of the workpiece W, and is for determining the workpiece W that is difficult to be inspected due to shadows due to unevenness or halation due to film (for example, For example, it is possible to distinguish printing on an aluminum packaging material through a transparent film).

照明アタッチメント１００は、光源１０１に取り付け可能である。この光源１０１は、上述したように、撮像装置１であってもよいし、カメラを有しない単純な光源であってもよい。光源１０１から出射される光の出射方向は、照明アタッチメント１００の前後方向（図１１でいうと上下方向）である。換言すれば、照明アタッチメント１００の取り付け方向と平行であって、照明アタッチメント１００の取り付け向き（図１１に示す矢印の向き）と逆向きである。 The illumination attachment 100 can be attached to the light source 101. As described above, the light source 101 may be the imaging device 1 or a simple light source that does not have a camera. The emission direction of the light emitted from the light source 101 is the front-rear direction of the illumination attachment 100 (the vertical direction in FIG. 11). In other words, it is parallel to the attachment direction of the illumination attachment 100 and is opposite to the attachment direction of the illumination attachment 100 (the direction of the arrow shown in FIG. 11).

照明アタッチメント１００は、光源１０１からの光を取り込む光取込口（入口）１１２が設けられた後端部１０３と、後端部１０３よりも拡開した前端部１０４を備える光誘導部１０２を有しており、後端部１０３から前端部１０４にかけて、光誘導部１０２の内部に光反射通路１０５が形成されている。この光反射通路１０５の内部では、光が繰り返し反射され（図１１中の矢印参照）、反射の過程で光ベクトルが分割され、より均一な光に近づいていく。後端部１０３と、後端部１０３より拡開した前端部１０４に関して補足すると、後端部１０３の径をｒ_１とし、前端部１０４の径をｒ_２とすると、ｒ_１＜ｒ_２の関係が成立している。言い換えると、照明アタッチメント１００の中心軸（光源１０１が撮像装置１の場合、撮像部の光軸）と略直交する方向の径を考えたとき、ｒ_１＜ｒ_２の関係が成立している。これにより、光源１０１から出射された光は、光反射通路１０５の内部で反射を繰り返しながら、照明アタッチメント１００の中心軸から次第に離れていく。光反射通路１０５に角部が存在すると、そこに光が集まって結果的に照明ムラに繋がるため、好ましくは、図７に示すようにＲをつける、すなわち光誘導部１０２を略ドーム形状（略半球形状、略笠形状）にすることが好ましい。これにより、ワークＷの照明ムラを抑えることができる。光誘導部１０２をドーム形状にした場合、その天頂を含む天頂付近（天頂部）を光源１０１に取り付ければよい。 The illumination attachment 100 includes a light guiding portion 102 including a rear end portion 103 provided with a light inlet (entrance) 112 that takes in light from the light source 101 and a front end portion 104 that is wider than the rear end portion 103. A light reflection path 105 is formed in the light guiding portion 102 from the rear end portion 103 to the front end portion 104. Inside the light reflection path 105, light is repeatedly reflected (see the arrow in FIG. 11), and the light vector is divided in the process of reflection, approaching more uniform light. A rear portion 103, when supplemented with regard front end 104 that is flared from the rear end portion 103, the diameter of the rear end portion 103 and _{r 1,} when the diameter of the front end portion 104 and _{r _2,} the relationship of r 1 _{<r 2} Is established. In other words, when considering the diameter in a direction substantially orthogonal to the central axis of the illumination attachment 100 (when the light source 101 is the imaging device 1, the optical axis of the imaging unit), the relationship r ₁ <r ₂ is established. Thereby, the light emitted from the light source 101 is gradually separated from the central axis of the illumination attachment 100 while being repeatedly reflected inside the light reflection path 105. If there is a corner in the light reflection path 105, light gathers there, resulting in uneven illumination. Therefore, it is preferable to add R as shown in FIG. It is preferable to use a hemispherical shape or a substantially shade shape. Thereby, the illumination nonuniformity of the workpiece | work W can be suppressed. When the light guiding portion 102 is formed in a dome shape, the vicinity of the zenith (the zenith portion) including the zenith may be attached to the light source 101.

前端部１０４には、光反射通路１０５の出口１１２が設けられ、この出口１１２に対面して第１の反射部１０６が配置される。この第１の反射部１０６によって、光反射通路１０５の出口１１２から出た光は後端部１０３に向けて後方に反射される。換言すれば、光反射通路１０５の出口１１２から出た光は、照明アタッチメント１００の中心軸に近づくように、光誘導部１０２により形成される内部空間に向けて反射される。そして、第１の反射部１０６にて反射した光は、第２の反射部１０７によって更に反射される。言い換えると、第１の反射部１０６の径方向内側に形成された光照射口１１４に向けて前方に反射される。さらに言い換えると、照明アタッチメント１００の取り付け向きと略反対の向きに反射される。なお、光源１０１として撮像装置１を用いた場合、図７に示す照明アタッチメント６と同様に、第２の反射部１０７の中心に撮像窓を設ける必要がある。また、第２の反射部１０７は、図７に示す照明アタッチメント６と同様に、光誘導部１０２の径方向最内面で代用することも可能である。これにより、第２の反射部１０７として別部材を用意する必要がなく、部品点数を削減することができる。 The front end portion 104 is provided with an outlet 112 of the light reflecting passage 105, and the first reflecting portion 106 is disposed facing the outlet 112. The light reflected from the exit 112 of the light reflection path 105 is reflected backward toward the rear end portion 103 by the first reflecting portion 106. In other words, the light emitted from the exit 112 of the light reflection path 105 is reflected toward the internal space formed by the light guiding unit 102 so as to approach the central axis of the illumination attachment 100. Then, the light reflected by the first reflection unit 106 is further reflected by the second reflection unit 107. In other words, the light is reflected forward toward the light irradiation port 114 formed on the radially inner side of the first reflecting portion 106. In other words, the light is reflected in a direction substantially opposite to the mounting direction of the illumination attachment 100. When the imaging apparatus 1 is used as the light source 101, it is necessary to provide an imaging window at the center of the second reflecting portion 107, as in the case of the illumination attachment 6 shown in FIG. Moreover, the 2nd reflection part 107 can also be substituted by the radial direction innermost surface of the light guide part 102 similarly to the illumination attachment 6 shown in FIG. Thereby, it is not necessary to prepare another member as the second reflecting portion 107, and the number of parts can be reduced.

このように、本実施例に係る照明アタッチメント１００は、光源１０１から出射された光を、光反射通路１０５で繰り返し反射させながら前方に伝播させ、第１の反射部１０６によって一旦後方に反射させた後、さらに第２の反射部１０７によって前方に反射させるようにしている。このような構成を採用することによって、従来技術にあるような光ファイバを配線する必要はないし、第１の反射部１０６にＬＥＤ等の光源を配置する必要はない。その結果、ワークから照明アタッチメント１００の縁部付近（第１の反射部１０６付近）に水滴が飛び散ったとしても、光源の故障を防ぐことができる（場合によっては、光源の防水処理等も不要である）。また、第１の反射部１０６に光源を配置する必要がないことによって、照明アタッチメント１００の縁部付近が（例えば径方向外側に）大型化するのを防ぐことができる。 As described above, the illumination attachment 100 according to the present embodiment propagates the light emitted from the light source 101 forward while being repeatedly reflected by the light reflection path 105, and once reflected backward by the first reflection unit 106. Thereafter, the light is further reflected forward by the second reflecting portion 107. By adopting such a configuration, it is not necessary to wire an optical fiber as in the prior art, and it is not necessary to arrange a light source such as an LED in the first reflecting portion 106. As a result, even if water droplets scatter from the workpiece to the vicinity of the edge of the illumination attachment 100 (near the first reflecting portion 106), it is possible to prevent a failure of the light source (in some cases, a waterproof process of the light source is unnecessary). is there). Moreover, since it is not necessary to arrange a light source in the 1st reflection part 106, it can prevent that the edge part vicinity of the illumination attachment 100 enlarges (for example, radial direction outer side).

以上、撮像装置１や光源１０１に対して脱着可能な照明アタッチメント６として典型的な実施例を説明したが、撮像装置１や光源１０１に照明アタッチメント６を容易に取り外すことができない状態で組み付けて、照明アタッチメント６を撮像装置１や光源１０１と一体構造にしてもよい。 As mentioned above, although the typical Example was described as the illumination attachment 6 which can be attached or detached with respect to the imaging device 1 or the light source 101, it assembled | attached in the state which cannot remove the illumination attachment 6 to the imaging device 1 or the light source 101 easily, The illumination attachment 6 may be integrated with the imaging device 1 and the light source 101.

また、例えば撮像装置１に内蔵した光源を撮像装置１から分離させ、この分離した光源に本発明の照明装置を装着して撮像領域を照明しながら、この撮像領域を斜めに臨む位置にカメラ（撮像装置）を設置して撮像するようにしてもよい。また、カメラに光ファイバの一端を接続した撮像システムに対して本発明の照明装置を組み付けるようにしてもよい。 In addition, for example, a light source built in the imaging device 1 is separated from the imaging device 1, and the illumination device of the present invention is attached to the separated light source to illuminate the imaging region, and a camera ( You may make it image by installing an imaging device. Moreover, you may make it assemble the illuminating device of this invention with respect to the imaging system which connected the end of the optical fiber to the camera.

１撮像装置
２０６内蔵照明ユニット
４ＬＥＤ(光源)
６照明アタッチメント
８連結スリーブ
１０照明アタッチメントのアウター
１０ａアウターの内面
１２照明アタッチメントのインナー
１２ａインナーの外面
１２ｂインナーの内面（第２の反射面）
１４前端反射リング部材
１４ａ反射リングの反転反射面（第１の反射面）
１６光反射通路の入口（光取込口）
１７光反射通路の出口
１８照明アタッチメントの光照射口
２０インナーの頂部のスリーブ（観察筒）
２２観察通路
１０１光源
Ｐアウターとインナーとの間の通路（光反射通路） DESCRIPTION OF SYMBOLS 1 Imaging device 206 Built-in illumination unit 4 LED (light source)
6 Lighting Attachment 8 Connecting Sleeve 10 Lighting Attachment Outer 10a Outer Inner Surface 12 Lighting Attachment Inner 12a Inner Outer Surface 12b Inner Inner Surface (Second Reflecting Surface)
14 Front end reflection ring member 14a Reverse reflection surface (first reflection surface) of reflection ring
16 Entrance of light reflection passage (light inlet)
17 Outlet of light reflection passage 18 Light irradiation port of illumination attachment 20 Sleeve on top of inner (observation tube)
22 Observation path 101 Light source P Path between outer and inner (light reflection path)

Claims

It is attached to an imaging device having an imaging unit for imaging an inspection object and a light source for illuminating an observation area observed by the imaging unit, and takes light from the light source from the rear end part to reflect light. A lighting fixture that irradiates light from the front end to the observation area of the imaging unit while repeating
Light reflection that has a contour shape that expands from the rear end portion toward the front end portion and guides light entering from the entrance located at the rear end portion toward the front end portion while repeatedly reflecting light. A passage,
A first reflecting surface disposed facing the outlet of the light reflecting passage, reflecting light emitted from the light reflecting passage toward the rear end portion and extending in a circumferential direction of the front end portion;
A second reflecting surface located inside the light reflection path and gradually expanding toward the observation region of the imaging unit and opened toward the observation region of the imaging unit;
The light reflected by the first reflecting surface is reflected by the second reflecting surface, thereby irradiating the light from the radially inner exit of the first reflecting surface toward the observation region of the imaging unit. Lighting equipment characterized by

A light intake port that is attached to an imaging device having an imaging unit that images an inspection object and a light source for illuminating an observation region observed by the imaging unit, and that takes in light from the light source; A light fixture having a light reflection path that guides light reflected from a light inlet while reflecting the light guided by the light reflection path to the outside,
A rear end provided with the light inlet;
A front end provided with an outlet of the light reflection passage and wider than the rear end;
A light guiding portion located between the rear end portion and the front end portion, and having the light reflection path formed therein;
A first reflecting portion that is arranged to face an outlet of the light reflecting passage provided at the front end portion, and reflects light emitted from the light reflecting passage backward toward the rear end portion;
A second reflecting portion that reflects light reflected by the first reflecting portion forwardly toward the light irradiation port formed radially inside the first reflecting portion;
Wherein the rear end, luminaires, characterized in that the observation passage for passing the optical axis of the imaging unit when the luminaire is attached to the imaging device is formed.

The light source in the imaging device is arranged so as to surround the optical axis of the imaging unit,
The lighting fixture according to claim 2, wherein the light intake port is provided at the rear end so as to take in all the light from the light source.

The imaging device has an internal passage through which the optical axis of the imaging unit passes on the radially inner side of the light source,
Wherein the observation path and the internal passageway, the diameter direction is formed to be substantially the same, when the luminaire is attached to the imaging device, is positioned coaxially claim 3 The lighting fixture as described in.

The first reflecting portion has a flange portion that protrudes inward in the radial direction from the front end portion and extends in the circumferential direction and inward of the front end portion, and light emitted from the light reflecting passage is rearward by the flange portion. The lighting fixture according to any one of claims 2 to 4, wherein the lighting fixture is reflected.

The lighting apparatus according to any one of claims 2 to 5, wherein the second reflecting portion has a diffusion surface that has been subjected to a diffusion process for diffusing light.

Before SL reflected light path is formed in the outer of the inner surface expanding toward the front end, and the inner exterior surface diverging toward the position and and the front end to the inside of the outer,
The lighting fixture according to claim 6 , wherein the diffusing surface of the second reflecting portion is configured by the inner surface of the inner.

The inner surface and the outer surface forming the light reflection path, the first reflection surface, and at least one of the second reflection surfaces have a function of scattering light. Lighting fixtures.

The lighting fixture according to claim 1 or 8, wherein the second reflecting surface is formed of a dome-shaped curved surface.

The lighting fixture according to claim 1, wherein the light source is an LED.

Is composed of the inner surface of the front Symbol first reflecting part having a peripheral edge portion connected to the open end of the outer and circumferentially continuously extending ring member,
The second reflecting portion is constituted by an inner surface of the inner;
The lighting fixture according to claim 7, wherein the reflected light from the inner surface of the inner is irradiated toward the observation region from the light irradiation port surrounded by the ring member.

The lighting fixture according to claim 11, wherein the outer and the inner have a dome shape.

The lighting fixture according to claim 12, wherein an inner surface of the ring member is configured by a surface curved convexly toward the front.

The luminaire according to claim 1, wherein the luminaire can be detachably attached to an imaging device including a light source.

The imaging device which contains the lighting fixture as described in any one of Claims 1-14 in one of a component.