JPH0651863U - Pinhole detector - Google Patents
Pinhole detectorInfo
- Publication number
- JPH0651863U JPH0651863U JP9194492U JP9194492U JPH0651863U JP H0651863 U JPH0651863 U JP H0651863U JP 9194492 U JP9194492 U JP 9194492U JP 9194492 U JP9194492 U JP 9194492U JP H0651863 U JPH0651863 U JP H0651863U
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- Prior art keywords
- light
- plate
- pinhole
- light receiving
- porous member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Length Measuring Devices By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
(57)【要約】
【目的】 ピンホールの検出精度が向上でき、これによ
り微小なピンホールであっても検出できると共に、検出
誤判も低減し、さらには、被検板のより端部までピンホ
ールの検出ができるピンホール検出器を提供する。
【構成】 被検板１４の上下に光源１１と受光部１２を
相対的に配置し、前記被検板１４の両側に、前記被検板
１４の両端部を外方から被って、不要な漏洩光が前記被
検板１４の両側方向から前記受光部１２に入り込むのを
防止する左右一対の側部遮光部１５を設けたピンホール
検出器１０において、前記受光部１２の入光口に、表面
が吸光色である筒体を集合させた多孔部材を設けた。
(57) [Abstract] [Purpose] The accuracy of pinhole detection can be improved, which enables detection of even minute pinholes, reduces false detections, and further allows pinholes to reach the edge of the plate to be tested. Provided is a pinhole detector capable of detecting holes. A light source 11 and a light receiving portion 12 are relatively arranged above and below a test plate 14, and both ends of the test plate 14 are covered on both sides of the test plate 14 from outside to prevent unnecessary leakage. In the pinhole detector 10 provided with a pair of left and right side light-shielding portions 15 for preventing light from entering the light receiving portion 12 from both sides of the plate to be inspected 14, a surface of the light receiving portion 12 has a light entrance. A porous member was provided in which cylindrical bodies having an absorption color were assembled.
Description
【０００１】[0001]
本考案は、例えば、鋼板等の不透明板のピンホールを検出するピンホール検出 器に係り、更に詳しくは、ピンホールの検出精度を向上できるピンホール検出器 に関する。 The present invention relates to a pinhole detector that detects a pinhole in an opaque plate such as a steel plate, and more particularly to a pinhole detector that can improve the pinhole detection accuracy.
【０００２】[0002]
例えば、缶詰用のブリキ板は、用途上ピンホールの存在が許されないため、厳 格な検査が行われている。この検査に使用されるピンホール検出器は、ブリキ板 の条材を、上方に配置された光源と、下方に配置された受光部との間を通して搬 送させ、光源の光をブリキ板のピンホールを通して受光部が検出することにより 、ピンホールの有無を検査するものである。 For example, tin plates for canning are subject to rigorous inspections because pinholes are not allowed for their purposes. The pinhole detector used for this inspection transports the strip material of the tin plate between the light source located above and the light receiving part located below, and the light from the light source is pinned to the tin plate. The presence or absence of pinholes is inspected by the light receiving section detecting through the holes.
【０００３】[0003]
しかしながら、前述した従来技術において、受光部に入光する光には、光源か らピンホールを通過した直下光だけでなく、斜め方向から入り込んでくる不要な 漏洩光があり、該漏洩光によって、受光部の光センサ、例えばフォトマルチプラ イヤを使用する場合には少しの電流が流れ（以下、暗電流という）、結果として 微小なピンホールに対しての検出精度が悪いという問題点があった。 本考案はこのような事情に鑑みてなされたもので、ピンホールの検出精度が向 上でき、これにより微小なピンホールであっても検出できると共に、検出誤判も 低減できるピンホール検出器を提供することを第１の目的とする。さらには、被 検板のより端部までピンホールの検出ができるピンホール検出器を提供すること を第２の目的とする。 However, in the above-mentioned conventional technology, the light entering the light receiving portion includes not only the light directly passing through the pinhole from the light source but also unnecessary leaked light entering from an oblique direction. When using an optical sensor in the light receiving part, such as a photomultiplier, a small amount of current flows (hereinafter referred to as dark current), and as a result, there is a problem that the detection accuracy for minute pinholes is poor. . The present invention has been made in view of such circumstances, and provides a pinhole detector that can improve the detection accuracy of pinholes, and thus can detect even minute pinholes and reduce false detection errors. The first purpose is to do so. Further, a second object is to provide a pinhole detector capable of detecting pinholes to the edge of the plate to be inspected.
【０００４】[0004]
前記第１の目的に沿う請求項１記載のピンホール検出器は、被検板の上下に光 源と受光部を相対的に配置し、前記被検板の両側に、前記被検板の両端部を外方 から被って、不要な漏洩光が前記被検板の両側方向から前記受光部に入り込むの を防止する左右一対の側部遮光部を設けたピンホール検出器において、前記受光 部の入光口に、表面が吸光色である筒体を集合させた多孔部材を設けた構成とし ている。 また、前記第１および第２の目的に沿う請求項２記載のピンホール検出器は、 請求項１記載のピンホール検出器において、前記側部遮光部の被検板側の面に、 表面が吸光色の筒体の集合体である多孔部材を設けた構成としている。 さらに、前記第１および第２の目的に沿う請求項３記載のピンホール検出器は 、請求項１記載のピンホール検出器において、前記側部遮光部の被検板側の面に 、表面が吸光色である多数の波部を設けた構成としている。 The pinhole detector according to claim 1, which meets the first object, has a light source and a light receiving portion relatively arranged above and below a plate to be inspected, and both ends of the plate to be inspected on both sides of the plate to be inspected. In the pinhole detector provided with a pair of left and right side light-shielding portions that prevent unnecessary leaked light from entering the light receiving portion from both sides of the plate to be inspected from the outside, The light entrance has a configuration in which a porous member is provided in which cylindrical bodies having a light-absorbing surface are assembled. The pinhole detector according to claim 2 which meets the first and second objects is the pinhole detector according to claim 1, wherein the surface of the side light-shielding portion on the side of the plate to be tested has a surface. A porous member, which is an assembly of light-absorbing color cylinders, is provided. Furthermore, the pinhole detector according to claim 3 which meets the first and second objects is the pinhole detector according to claim 1, wherein the surface of the side light-shielding portion on the side of the plate to be tested has a surface. It is configured to have a large number of wave portions that are light absorbing colors.
【０００５】[0005]
請求項１〜３記載のピンホール検出器において、光源からピンホールを通過し た垂直光は、多孔部材の各筒体をそのまま通過して受光部が検出する一方、斜め 方向から入り込んでくる不要な漏洩光は、多孔部材の内面が吸光色の各筒体内で 反射して光度が減衰するので、受光部の暗電流を小さくでき、従ってピンホール の検出精度が向上でき、これにより微小なピンホールであっても検出できると共 に、検出誤判も低減できる。 特に、請求項２、３記載のピンホール検出器においては、漏洩光が被検板の両 端部と側部遮光部との隙間から受光部側に入り込もうとしても、側部遮光部の被 検板側の面に設けられた多孔部材または多数の波部により、同様にその光度は減 衰されるので、受光部の暗電流をさらに小さくでき、これによりピンホールの検 出精度をより以上に向上できると共に、被検板のより端部まで精度良くピンホー ルを検出できる。 In the pinhole detector according to any one of claims 1 to 3, vertical light that has passed through the pinhole from the light source passes through each cylindrical body of the porous member as it is and is detected by the light receiving section, but there is no need to enter from an oblique direction. Such leaked light is reflected by the inner surface of the porous member inside each of the light-absorbing cylinders, and the luminous intensity is attenuated. Therefore, the dark current in the light receiving part can be reduced, and the pinhole detection accuracy can be improved. Even holes can be detected, and false detections can be reduced. Particularly, in the pinhole detector according to claims 2 and 3, even if leaked light tries to enter the light receiving portion side through the gap between both end portions of the plate to be detected and the side light shielding portion, the side light shielding portion is covered. Since the luminous intensity is similarly reduced by the porous member or the multiple corrugated parts provided on the plate side, it is possible to further reduce the dark current of the light receiving part, which further improves the pinhole detection accuracy. In addition, the pinhole can be accurately detected up to the edge of the plate to be tested.
【０００６】[0006]
続いて、添付した図面を参照しつつ、本考案を具体化した実施例につき説明し 、本考案の理解に供する。 ここに、図１は本考案の第１の実施例に係るピンホール検出器の側面図、図２ は同受光部の拡大断面図、図３は同受光部の一部拡大側面図、図４（ａ）は多孔 部材の一部拡大平面図、図４（ｂ）は同その他の多孔部材の一部拡大平面図、図 ４（ｃ）は同さらに他の多孔部材の一部拡大平面図、図５は同ピンホール検出中 の側部遮光部の要部拡大平面図、図６は同ピンホール検出中の側部遮光部の要部 拡大部分断面図、図７はピンホール検出中の同要部拡大断面図、図８は第２の実 施例に係るピンホール検出器の側部遮光部の要部拡大断面図を示している。 Next, an embodiment of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is a side view of the pinhole detector according to the first embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same light receiving portion, FIG. 3 is a partially enlarged side view of the same light receiving portion, and FIG. 4A is a partially enlarged plan view of the porous member, FIG. 4B is a partially enlarged plan view of the other porous member, and FIG. 4C is a partially enlarged plan view of the other porous member. FIG. 5 is an enlarged plan view of an essential part of the side light-shielding portion during detection of the pinhole, FIG. 6 is an enlarged partial sectional view of an essential part of the side light-shielding portion during detection of the pinhole, and FIG. FIG. 8 shows an enlarged cross-sectional view of a main part, and FIG. 8 shows an enlarged cross-sectional view of a main part of a side light-shielding part of the pinhole detector according to the second embodiment.
【０００７】 以下、本考案の第１の実施例に係るピンホール検出器を説明する。 図１に示すように、本考案の第１の実施例に係るピンホール検出器１０は、互 いに所定間隔をあけて、上方配置された光源１１と、下方配置された受光部１２ とを有している。受光部１２内には、フォトマルチプライヤからなる多数個の光 センサ１３が一定間隔毎に配置されており、また受光部１２上には、不要な漏洩 光Ｌ２（図６、７参照）が被検板１４の両側から受光部１２に入り込むのを防止 する左右一対の側部遮光部１５を配設している。これらの側部遮光部１５は、被 検板１４の幅に応じて互いの間隔を調整できるように、横方向に移動可能になっ ており、それぞれの側部遮光部１５の移動方向の外側面には、側部遮光部１５の 移動隙間から受光部１２内に光が漏れるのを防止する一対の遮光部材１６を設け ている。Hereinafter, a pinhole detector according to a first embodiment of the present invention will be described. As shown in FIG. 1, a pinhole detector 10 according to a first embodiment of the present invention includes a light source 11 arranged above and a light receiving section 12 arranged below, which are spaced apart from each other by a predetermined distance. Have A large number of photosensors 13 composed of photomultipliers are arranged at regular intervals in the light receiving section 12, and unnecessary leaked light L2 (see FIGS. 6 and 7) is received on the light receiving section 12. A pair of left and right side light-shielding portions 15 are arranged to prevent the light-receiving portion 12 from entering from both sides of the inspection plate 14. These side light-shielding portions 15 are movable in the lateral direction so that the distance between them can be adjusted according to the width of the test plate 14, and the outer surface in the moving direction of each side light-shielding portion 15 is formed. A pair of light blocking members 16 that prevent light from leaking into the light receiving unit 12 through the moving gap of the side light blocking unit 15 is provided in the light receiving unit 12.
【０００８】 図２、３に示すように、受光部１２の入光口１２ａは、ガラス板１７により塞 がれており、ガラス板１７上に漏洩光Ｌ２の光度を減衰させる多孔部材１８を設 けている。なお、この多孔部材１８は、図２、３の二点鎖線に示すように、入光 口１２ａの下側に設けてもよい。多孔部材１８の各筒体１９（図７参照）の開口 方向は、光源１１と受光部１２とが配置された上下方向である。それぞれの筒体 １９の内周面を含む多孔部材１８の表面は、吸光色である黒色になっており、ま た筒体１９、１９ａ、１９ｂの形状は、平面視して、例えば図４（ａ）に示すよ うなマトリクス状、図４（ｂ）に示すようなハニカム状、図４（ｃ）に示すよう な格子状など、漏洩光Ｌ２の光度を減衰できればその形状や大きさは限定されな い。なお、本実施例においては筒体１９で代表して説明するが、筒体１９ａ、１ ９ｂを使用する場合も当然本考案は適用される。 また、図５、６に示すように、前記側部遮光部１５は側面視してコの字形を有 しており、水平方向に延びる上下一対の突出部１５ａの中央部には、被検板１４ 側の面を切欠して、例えば、被検板１４の両端部の最端部にできたピンホール２ ０を検出する窓部２１を形成している。さらに、側部遮光部１５の被検板１４側 の上下面には、前記多孔部材１８と同様の構造を有して、被検板１４の両端部側 から受光部側に入り込もうとする漏洩光Ｌ２の光度を減衰させる多孔部材１８′ を設けている。As shown in FIGS. 2 and 3, the light entrance 12 a of the light receiving unit 12 is closed by a glass plate 17, and a porous member 18 that attenuates the luminous intensity of the leaked light L 2 is provided on the glass plate 17. I'm sick. The porous member 18 may be provided below the light entrance 12a as shown by the chain double-dashed line in FIGS. The opening direction of each cylinder 19 (see FIG. 7) of the porous member 18 is the vertical direction in which the light source 11 and the light receiving unit 12 are arranged. The surface of the porous member 18 including the inner peripheral surface of each tubular body 19 is black, which is a light absorbing color, and the shapes of the tubular bodies 19, 19a and 19b are, for example, as shown in FIG. The shape and size of the matrix shape as shown in a), the honeycomb shape as shown in FIG. 4B, the lattice shape as shown in FIG. Absent. In the present embodiment, the cylinder 19 will be described as a representative, but the present invention is naturally applicable to the case where the cylinders 19a and 19b are used. Further, as shown in FIGS. 5 and 6, the side light-shielding portion 15 has a U-shape when viewed from the side, and the plate to be inspected is provided at the center of a pair of upper and lower protruding portions 15a extending in the horizontal direction. The surface on the side of 14 is cut out to form, for example, a window portion 21 for detecting the pinhole 20 formed at the extreme ends of both ends of the plate 14 to be detected. Further, the upper and lower surfaces of the side light-shielding portion 15 on the side of the plate to be detected 14 have the same structure as that of the porous member 18, and leak light which tries to enter the light receiving part from both ends of the plate to be detected 14. A porous member 18 'for attenuating the light intensity of L2 is provided.
【０００９】 続いて、本考案の第１の実施例に係るピンホール検出器１０の動作を説明する 。 図１に示すように、被検板１４の両端部と左右の側部遮光部１５との間に若干 の隙間があくように、被検板１４の横幅に合わせて、左右の側部遮光部１５の位 置を調整する。このとき、それぞれの遮光部材１６により、側部遮光部１５の移 動隙間が閉鎖されるので、光はこの移動隙間から受光部１２に漏れ込まない。 次いで、図７に示すように、光源１１から下向きに光を照射しながら、光源１ １と受光部１２との間を通過させて被検板１４を搬送する。被検板１４にピンホ ール２０があると、光源１１の光はピンホール２０を通過して直下光Ｌ１になり 、多孔部材１８の各筒体１９内を、光度が減衰することなくそのまま通過する。 この通過した光は、ガラス板１７を透過して入光口１２ａから受光部１２内に入 光し、これを光センサ１３が検出する。Next, the operation of the pinhole detector 10 according to the first embodiment of the present invention will be described. As shown in FIG. 1, the left and right side light-shielding portions are adjusted in accordance with the lateral width of the inspection plate 14 so that there is a slight gap between both ends of the subject plate 14 and the left and right side light-shielding portions 15. Adjust position 15. At this time, the moving gaps of the side light-shielding portions 15 are closed by the respective light-shielding members 16, so that light does not leak into the light-receiving portion 12 through the moving gaps. Next, as shown in FIG. 7, while irradiating light downward from the light source 11, the test plate 14 is conveyed while passing between the light source 11 and the light receiving unit 12. When the plate 14 to be inspected has the pinhole 20, the light from the light source 11 passes through the pinhole 20 and becomes the direct light L1 and passes through the inside of each cylindrical body 19 of the porous member 18 without being attenuated in intensity. To do. The passed light passes through the glass plate 17 and enters the light receiving portion 12 through the light entrance 12a, and the light sensor 13 detects the light.
【００１０】 一方、同図に示すように、斜め方向から受光部１２側に入り込んでくる不要な 漏洩光Ｌ２は、多孔部材１８の各筒体１９を通過する際に、その入射角度に応じ て吸光色の筒体１９の内周面に多数回反射し、これによりその光度は減衰する。 このため、受光部１２の暗電流を今まで以上に小さくでき、従ってピンホール２ ０の検出精度が向上でき、これにより微小なピンホール２０であっても検出でき ると共に、検出誤判も低減できる。On the other hand, as shown in the figure, unnecessary leaked light L2 that enters the light receiving portion 12 side from an oblique direction, depending on the incident angle when passing through each tubular body 19 of the porous member 18. The light absorption color is reflected on the inner peripheral surface of the cylindrical body 19 many times, and the luminous intensity thereof is attenuated. For this reason, the dark current of the light receiving portion 12 can be made smaller than ever, and therefore the detection accuracy of the pinhole 20 can be improved, whereby even a minute pinhole 20 can be detected and false detection can be reduced. .
【００１１】 また、図６に示すように、被検板１４の両側部においては、漏洩光Ｌ２が、こ れらの被検板１４の表面や側部遮光部１５の内面を反射しながら、被検板１４と 側部遮光部１５との隙間より受光部１２側に入り込もうとしても、側部遮光部１ ５の被検板１４側の面に設けられた多孔部材１８′により、次第にその光度は減 衰される。これにより受光部１２の入光口１２ａに多孔部材１８を設けたのみの 場合より、受光部１２の暗電流をさらに小さくでき、これによりピンホール２０ の検出精度をより以上に向上できる。さらに、このように側部遮光部１５の隙間 を通過する漏洩光Ｌ２の光度が多孔部材１８′により減衰されるので、被検板１ ４の端部が側部遮光部１５により完全に隠れる幅ｑを従来の幅より短くしても、 漏洩光Ｌ２はこの側部遮光部１５の隙間を通過して受光部１２側へは漏れない。 従って、被検板１４のより端部まで精度良くピンホール２０を検出できる。 なお、被検板１４の両端部におけるピンホール２０の検出の際には、それぞれ の側部遮光部１５に設けられた窓部２１を用いて検出がなされる。Further, as shown in FIG. 6, on both sides of the test plate 14, the leaked light L 2 reflects on the surface of the test plate 14 and the inner surface of the side light shielding part 15, Even if an attempt is made to enter the light receiving portion 12 side through the gap between the test plate 14 and the side light-shielding portion 15, the porous member 18 ′ provided on the surface of the side light-shielding portion 15 on the test plate 14 gradually causes that The brightness is diminished. As a result, the dark current of the light receiving section 12 can be further reduced as compared with the case where only the porous member 18 is provided at the light entrance 12a of the light receiving section 12, and thereby the detection accuracy of the pinhole 20 can be further improved. Further, since the light intensity of the leaked light L2 passing through the gap between the side light-shielding portions 15 is attenuated by the porous member 18 'in this manner, the width at which the end portion of the test plate 14 is completely hidden by the side light-shielding portions 15. Even if q is made shorter than the conventional width, the leaked light L2 does not leak to the light receiving portion 12 side through the gap of the side light shielding portion 15. Therefore, the pinhole 20 can be accurately detected up to the end of the plate to be inspected 14. When detecting the pinholes 20 at both ends of the plate to be inspected 14, the windows 21 provided in the respective side light-shielding portions 15 are used for detection.
【００１２】 次に、図８を参照しながら本考案の第２の実施例に係るピンホール検出器を説 明する。 図８に示すように、本考案の第２の実施例のピンホール検出器３０は、側部遮 光部３１の内面に、表面が吸光色である多数の波部の一例としての比較的彫りの 深い鋸状の山形溝３２を設けたものである。山形溝３２に入った漏洩光Ｌ２は、 同図部分拡大図に示すように、その吸光色の内面に当たって奥側に反射しながら 、第１の実施例と同様にその光度が次第に減衰される。Next, a pinhole detector according to a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 8, the pinhole detector 30 according to the second embodiment of the present invention has a comparatively engraved inner surface of the side light-shielding portion 31, which is an example of a large number of wave portions having a light-absorbing surface. The deep saw-shaped chevron groove 32 is provided. As shown in the partial enlarged view of the figure, the leaked light L2 that has entered the chevron groove 32 hits the inner surface of the absorption color and is reflected toward the back side, while the light intensity thereof is gradually attenuated as in the first embodiment.
【００１３】 本考案は、この実施例に限定されるものではなく、要旨を逸脱しない範囲での 設計変更があっても本考案に含まれる。 例えば、実施例では、被検板の上方に光源を配置し、被検板の下方に受光部を 配置したが、これに限定しなくても、光源および受光部の配置を上下反対にして もよい。 また、実施例では、側部遮光部の被検板側の面に多孔部材を設けたが、この側 部遮光部に多孔部材がないものでも、本考案に含まれる。 さらにまた、側部遮光部の被検板側の面に設けられた波部の形状は、実施例の 山形溝に限定しなくても、例えば波状、Ｕ字溝状などのどのような形状であって もよい。 また、多孔部材の孔内に塵や埃が入らないように、多孔部材の上面にガラス板 などの透明板を設けてもよい。The present invention is not limited to this embodiment, and is included in the present invention even if there are design changes within the scope of the invention. For example, in the embodiment, the light source is arranged above the plate to be inspected and the light receiving section is arranged below the plate to be inspected. However, without being limited to this, the light source and the light receiving section may be arranged upside down. Good. Further, in the embodiment, the porous member is provided on the surface of the side light-shielding portion on the side of the plate to be tested, but the present invention includes a case where the side light-shielding portion has no porous member. Furthermore, the shape of the corrugated portion provided on the surface of the side light-shielding portion on the side of the plate to be tested is not limited to the chevron groove of the embodiment, but may be any shape such as corrugated or U-shaped groove. You can have it. Further, a transparent plate such as a glass plate may be provided on the upper surface of the porous member so as to prevent dust from entering the holes of the porous member.
【００１４】[0014]
請求項１〜３記載のピンホール検出器においては、このように光源からピンホ ールを通過した垂直光は、多孔部材の各筒体をそのまま通過して受光部が検出す るが、斜め方向から入り込んでくる漏洩光は、吸光色の多孔部材の各筒体内で反 射して光度が減衰されるので、受光部の暗電流を小さくでき、従ってピンホール の検出精度が向上でき、これにより微小なピンホールであっても検出できると共 に、検出誤判も低減できる。 特に、請求項２および３記載のピンホール検出器においては、漏洩光が被検板 の両端部と側部遮光部との隙間から受光部側に入り込もうとしても、側部遮光部 の被検板側の面に設けられた表面が吸光色の多孔部材または多数の波部により、 同様にその光度は減衰されるので、受光部の暗電流をさらに小さくでき、これに よりピンホールの検出精度をより以上に向上できると共に、被検板のより端部ま で精度良くピンホールを検出できる。 In the pinhole detector according to any one of claims 1 to 3, the vertical light that has passed through the pinhole from the light source passes through each cylindrical body of the porous member as it is and is detected by the light receiving section, but in an oblique direction. The leaked light coming in from the unit is reflected inside each cylinder of the absorptive porous member and its luminous intensity is attenuated, so the dark current in the light receiving part can be reduced, and therefore the pinhole detection accuracy can be improved. Even small pinholes can be detected, and false detections can be reduced. Particularly, in the pinhole detectors according to the second and third aspects, even if the leaked light enters the light receiving portion side through the gap between the both ends of the plate and the side light shielding portion, the side light shielding portion is inspected. Since the luminous intensity of the plate-side surface is also attenuated by the porous material or a large number of corrugated parts that absorb light, the dark current in the light-receiving part can be further reduced, which allows pinhole detection accuracy. Can be further improved and pinholes can be accurately detected up to the edge of the plate to be tested.
【図１】本考案の第１の実施例に係るピンホール検出器
の側面図である。FIG. 1 is a side view of a pinhole detector according to a first embodiment of the present invention.
【図２】同受光部の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of the light receiving unit.
【図３】同受光部の一部拡大側面図である。FIG. 3 is a partially enlarged side view of the light receiving unit.
【図４】（ａ）同多孔部材の一部拡大平面図である。 （ｂ）同その他の多孔部材の一部拡大平面図である。 （ｃ）同さらに他の多孔部材の一部拡大平面図である。FIG. 4A is a partially enlarged plan view of the porous member. (B) It is a partially enlarged plan view of the other porous member. (C) It is a partially enlarged plan view of the still another porous member.
【図５】同ピンホール検出中の側部遮光部の要部拡大平
面図である。FIG. 5 is an enlarged plan view of an essential part of a side light-shielding portion during detection of the pinhole.
【図６】同ピンホール検出中の側部遮光部の要部拡大部
分断面図である。FIG. 6 is an enlarged partial sectional view of an essential part of a side light-shielding portion during detection of the pinhole.
【図７】ピンホール検出中の同要部拡大断面図である。FIG. 7 is an enlarged cross-sectional view of the relevant part during pinhole detection.
【図８】本考案の第２の実施例に係るピンホール検出器
の側部遮光部の要部拡大断面図である。FIG. 8 is an enlarged cross-sectional view of a main part of a side light shielding part of a pinhole detector according to a second embodiment of the present invention.
１０ ピンホール検出器 １１ 光源 １２ 受光部 １２ａ 入光口 １３ 光センサ １４ 被検板 １５ 側部遮光部 １５ａ 突出部 １６ 遮光部材 １７ ガラス板 １８ 多孔部材 １８′ 多孔部材 １９ 筒体 １９ａ 筒体 １９ｂ 筒体 ２０ ピンホール ２１ 窓部 ３０ ピンホール検出器 ３１ 側部遮光部 ３２ 山形溝（波部） Ｌ１ 直下光 Ｌ２ 漏洩光 10 pinhole detector 11 light source 12 light receiving part 12a light entrance 13 optical sensor 14 test plate 15 side light blocking part 15a protruding part 16 light blocking member 17 glass plate 18 porous member 18 'porous member 19 cylindrical body 19a cylindrical body 19b cylindrical Body 20 Pinhole 21 Window part 30 Pinhole detector 31 Side light-shielding part 32 Mountain groove (wave part) L1 Direct light L2 Leaked light
Claims (3)
配置し、前記被検板の両側に、前記被検板の両端部を外
方から被って、不要な漏洩光が前記被検板の両側方向か
ら前記受光部に入り込むのを防止する左右一対の側部遮
光部を設けたピンホール検出器において、前記受光部の
入光口に、表面が吸光色である筒体を集合させた多孔部
材を設けたことを特徴とするピンホール検出器。1. A light source and a light receiving part are relatively arranged above and below a plate to be inspected, and both ends of the plate to be inspected are covered from outside on both sides of the plate to be detected, so that unnecessary leakage light is generated. In a pinhole detector provided with a pair of left and right side light-shielding portions that prevent the light receiving portion from entering into the light receiving portion from both sides of the plate to be inspected, a cylindrical body having a light-absorbing surface is provided at the light inlet of the light receiving portion. A pinhole detector characterized in that an aggregated porous member is provided.
が吸光色の筒体の集合体である多孔部材を設けたことを
特徴とする請求項１記載のピンホール検出器。2. The pinhole detector according to claim 1, wherein a porous member, which is an assembly of cylindrical bodies having a light-absorbing color, is provided on a surface of the side light-shielding portion on the test plate side. .
が吸光色である多数の波部を設けたことを特徴とする請
求項１記載のピンホール検出器。3. The pinhole detector according to claim 1, wherein a large number of wave portions having a light absorbing color are provided on the surface of the side light-shielding portion on the side of the plate to be inspected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9194492U JPH0651863U (en) | 1992-12-18 | 1992-12-18 | Pinhole detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9194492U JPH0651863U (en) | 1992-12-18 | 1992-12-18 | Pinhole detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0651863U true JPH0651863U (en) | 1994-07-15 |
Family
ID=14040706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9194492U Pending JPH0651863U (en) | 1992-12-18 | 1992-12-18 | Pinhole detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0651863U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002099400A1 (en) * | 2001-06-04 | 2002-12-12 | Hamamatsu Photonics K.K. | Pin hole detector |
| WO2002099401A1 (en) * | 2001-06-04 | 2002-12-12 | Hamamatsu Photonics K.K. | Pin hole detector |
| WO2002099402A1 (en) * | 2001-06-04 | 2002-12-12 | Hamamatsu Photonics K.K. | Pinhole detector |
| JP2010091460A (en) * | 2008-10-09 | 2010-04-22 | Nippon Steel Corp | Device and method for detecting hole defect |
| JP2011185776A (en) * | 2010-03-09 | 2011-09-22 | Toshiba Corp | Pinhole detector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53141684A (en) * | 1977-05-17 | 1978-12-09 | Nohmi Bosai Kogyo Co Ltd | Optical smoke detector |
| JPS5443396A (en) * | 1977-09-12 | 1979-04-05 | Nakatsu Shiyouten Kk | Saw teeth device for machine of producing material with deformed section such as jointer and angle block |
| JPS5638031A (en) * | 1979-09-04 | 1981-04-13 | West Electric Co Ltd | Automatic dimming electronic flash device |
| JPS5858616A (en) * | 1981-10-01 | 1983-04-07 | Ricoh Co Ltd | Soft starting circuit |
| JPH04232837A (en) * | 1990-08-07 | 1992-08-21 | Behringwerke Ag | Light measuring apparatus having scattered light trap |
-
1992
- 1992-12-18 JP JP9194492U patent/JPH0651863U/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53141684A (en) * | 1977-05-17 | 1978-12-09 | Nohmi Bosai Kogyo Co Ltd | Optical smoke detector |
| JPS5443396A (en) * | 1977-09-12 | 1979-04-05 | Nakatsu Shiyouten Kk | Saw teeth device for machine of producing material with deformed section such as jointer and angle block |
| JPS5638031A (en) * | 1979-09-04 | 1981-04-13 | West Electric Co Ltd | Automatic dimming electronic flash device |
| JPS5858616A (en) * | 1981-10-01 | 1983-04-07 | Ricoh Co Ltd | Soft starting circuit |
| JPH04232837A (en) * | 1990-08-07 | 1992-08-21 | Behringwerke Ag | Light measuring apparatus having scattered light trap |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002099400A1 (en) * | 2001-06-04 | 2002-12-12 | Hamamatsu Photonics K.K. | Pin hole detector |
| WO2002099401A1 (en) * | 2001-06-04 | 2002-12-12 | Hamamatsu Photonics K.K. | Pin hole detector |
| WO2002099402A1 (en) * | 2001-06-04 | 2002-12-12 | Hamamatsu Photonics K.K. | Pinhole detector |
| JP2002365226A (en) * | 2001-06-04 | 2002-12-18 | Hamamatsu Photonics Kk | Pin hole detector |
| JP2010091460A (en) * | 2008-10-09 | 2010-04-22 | Nippon Steel Corp | Device and method for detecting hole defect |
| JP2011185776A (en) * | 2010-03-09 | 2011-09-22 | Toshiba Corp | Pinhole detector |
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