JP2012173162A - Pinhole inspection device - Google Patents

Pinhole inspection device Download PDF

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JP2012173162A
JP2012173162A JP2011036036A JP2011036036A JP2012173162A JP 2012173162 A JP2012173162 A JP 2012173162A JP 2011036036 A JP2011036036 A JP 2011036036A JP 2011036036 A JP2011036036 A JP 2011036036A JP 2012173162 A JP2012173162 A JP 2012173162A
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light
irradiation
pinhole
inspection
inspection apparatus
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Seiichi Hasegawa
聖一 長谷川
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a pinhole inspection device capable of precisely inspecting the presence or absence of a pinhole with uniform detection sensitivity irrespective of a place of the pinhole even when the inspection is performed by irradiating a comparatively wide area of an object to be inspected with light.SOLUTION: The pinhole inspection device includes: a light irradiation device 40 capable of adjusting respective luminance of a plurality of light sources independently from each other and with multiple gradations; a light detection device 30 for light source adjustment, which detects irradiation light to be irradiated in plane by the plurality of the light sources of the light irradiation device 40; a control part 100 which adjusts the respective luminance of the plurality of the light sources with the multiple gradations so that the amount of the irradiation light irradiated in plane by the plurality of the light sources of the light irradiation device 40 based on a detection result of the light detection device 30 for the light source adjustment becomes uniform on the irradiation surface; and a light detection device 31 for pinhole inspection which detects the leaked light irradiated in plane from the light irradiation device 40, in which the luminance of the plurality of the light sources is adjusted by the control means 100, and transmitted through an object 10 to be inspected.

Description

本発明は、各種フィルム、金属箔、塗膜、蒸着膜などの薄膜、インクジェットヘッドの振動板などの板状物等の被検査物におけるピンホールの有無を検査するピンホール検査装置に関するものである。   The present invention relates to a pinhole inspection apparatus that inspects for the presence or absence of pinholes in an object to be inspected, such as various films, metal foils, thin films such as coating films, vapor deposition films, and plate-like objects such as diaphragms of inkjet heads. .

従来、この種のピンホール検査装置として、被検査物に光を照射し、その被検査物を透過した照射光を検出することにより、被検査物におけるピンホールの有無を光学的に検査するものが知られている。   Conventionally, as this type of pinhole inspection device, the inspection object is optically inspected by irradiating the inspection object with light and detecting the irradiation light transmitted through the inspection object. It has been known.

例えば、特許文献1には、被検査物の膜厚より孔部の径が小さい場合であっても容易に孔部の有無を光学的に検査することができる光学的検査装置が開示されている。この光学的検査装置は、(1)照射光を出射して被検査物に照射する光源と、(2)被検査物を挟んで光源とは反対側に配され、光源から出射された照射光のうち被検査物の孔部を通過した照射光を入射面に入射し、その照射光の入射に伴って蛍光を発生し、その蛍光を検出面から出射する蛍光部材と、(3)蛍光部材の検出面から出射した蛍光を検出する光検出器と、(4)光源と蛍光部材との間に設けられ、光源から出射された照射光を通過させる開口部を有し、その開口部を覆うように被検査物を載置するステージと、(5)ステージと被検査物との隙間を光が通過するのを防止するマスクと、を備えた光学的検査装置が開示されている。この光学的検査装置によれば、もし被検査物に孔部(ピンホール)がある場合には、光源から出射された照射光のうち被検査物の孔部を通過した照射光は、被検査物の孔部を通過して蛍光部材の入射面に入射する。蛍光部材では照射光の入射に伴って蛍光が発生し、その蛍光は、蛍光部材の検出面から出射して光検出器に入射し、光検出器により検出される。すなわち、光検出器による蛍光検出の有無に基づいて、被検査物における孔部の有無が検出される。   For example, Patent Document 1 discloses an optical inspection apparatus that can easily optically inspect the presence or absence of a hole even when the diameter of the hole is smaller than the film thickness of an object to be inspected. . This optical inspection apparatus includes (1) a light source that emits irradiation light and irradiates the inspection object, and (2) irradiation light that is arranged on the opposite side of the light source across the inspection object and is emitted from the light source. And (3) a fluorescent member that irradiates the incident light that has passed through the hole of the inspection object, enters the incident surface, generates fluorescence in response to the incident incident light, and emits the fluorescence from the detection surface. A photodetector for detecting the fluorescence emitted from the detection surface; and (4) an opening provided between the light source and the fluorescent member for allowing the irradiation light emitted from the light source to pass therethrough and covering the opening. As described above, an optical inspection apparatus including a stage on which an inspection object is placed and (5) a mask that prevents light from passing through a gap between the stage and the inspection object is disclosed. According to this optical inspection apparatus, if there is a hole (pinhole) in the inspection object, the irradiation light passing through the hole of the inspection object out of the irradiation light emitted from the light source is inspected. It passes through the hole of the object and enters the incident surface of the fluorescent member. In the fluorescent member, fluorescence is generated as the irradiation light is incident. The fluorescent light is emitted from the detection surface of the fluorescent member, enters the photodetector, and is detected by the photodetector. That is, the presence or absence of a hole in the inspection object is detected based on the presence or absence of fluorescence detection by the photodetector.

また、特許文献2には、校正基準物における透過光の検出値を基に照明光の光量および光検出器の感度を制御し、被検査物(被検サンプル)の検査結果を補正することができる高精度で簡易なピンホール検査装置が開示されている。このピンホール検査装置は、(1)被検査物を保持する保持手段と、(2)前記被検査物に照明光を照射する第1の照明手段と、(3)前記第1の照明手段から前記被検査物に存在するピンホールを透過した光を検出する第1の光検出手段と、(4)前記被検査物に存在するピンホール以外からの光を前記第1の光検出手段に入射させない第1の遮光手段と、(5)校正基準物と、(6)前記校正基準物に照明光を照射する第2の照明手段と、(7)前記第2の照明手段から前記校正基準物を透過した光を検出する第2の光検出手段と、(8)前記第2の光検出手段による検出値を基にして装置を校正する校正手段と、を備えている。   Japanese Patent Laid-Open No. 2004-26883 discloses a technique for controlling the amount of illumination light and the sensitivity of a photodetector based on a detected value of transmitted light in a calibration reference object, and correcting an inspection result of an inspection object (test sample). A highly accurate and simple pinhole inspection apparatus that can be used is disclosed. The pinhole inspection apparatus includes (1) a holding unit that holds an object to be inspected, (2) a first illuminating unit that irradiates illumination light to the object to be inspected, and (3) from the first illuminating unit. A first light detecting means for detecting light transmitted through a pinhole existing in the inspection object; and (4) light from a portion other than the pinhole existing in the inspection object is incident on the first light detection means. A first light shielding means that is not allowed, (5) a calibration reference object, (6) a second illumination means for irradiating illumination light to the calibration reference object, and (7) a calibration reference object from the second illumination means. And (8) calibration means for calibrating the apparatus based on the detection value of the second light detection means.

しかしながら、上記特許文献1の光学的検査装置及び上記特許文献2のピンホール検査装置では、被検査物に照射する照射光の照度ムラを補正する機構を有していないので、被検査物上のピンホール検査感度が均一でなく、被検査物上の場所によってはピンホールの検査精度が悪いという問題がある。   However, the optical inspection apparatus of Patent Document 1 and the pinhole inspection apparatus of Patent Document 2 do not have a mechanism for correcting the illuminance unevenness of the irradiation light irradiated on the inspection object. There is a problem that the pinhole inspection sensitivity is not uniform and the pinhole inspection accuracy is poor depending on the location on the inspection object.

本発明は以上の問題点に鑑みなされたものであり、その目的は、被検査物の比較的広い面積に光を照射して検査する場合であっても、ピンホールの場所によらず均一な検査感度で精度よくピンホールの有無を検査することができるピンホール検査装置を提供することである。   The present invention has been made in view of the above problems, and its purpose is uniform regardless of the location of the pinhole, even when a relatively large area of the object to be inspected is irradiated with light. To provide a pinhole inspection apparatus capable of accurately inspecting the presence or absence of a pinhole with inspection sensitivity.

上記目的を達成するために、請求項1の発明は、被検査物を透過した光を検出することにより、前記被検査物におけるピンホールの有無を検査するピンホール検査装置であって、被検査物に対して面状に光を照射可能に並設された複数の光源を有し、その複数の光源それぞれの輝度を互いに独立に複数階調で調整可能な光照射手段と、前記光照射手段の複数の光源によって面状に照射される照射光を検出する第1の光検出手段と、前記第1の光検出手段の検出結果に基づいて、前記光照射手段の複数の光源によって面状に照射される照射光の光量が照射面において均一になるように前記複数の光源それぞれの輝度を複数階調で調整する輝度調整手段と、前記輝度調整手段によって前記複数の光源の輝度が調整された前記光照射手段から面状に照射され被検査物を透過した漏れ光を検出する第2の光検出手段と、を備えたことを特徴とするものである。
また、請求項2の発明は、請求項1のピンホール検査装置において、前記光照射手段の複数の光源それぞれにおける発光部は、前記被検査物におけるピンホールの径よりも小さいことを特徴とするものである。
また、請求項3の発明は、請求項1又は2のピンホール検査装置において、前記第1の光検出手段は、前記光照射手段による照射光の空間分解能と同等又はより細かい空間分解能で前記照射光を検出することを特徴とするものである。
また、請求項4の発明は、請求項1乃至3のいずれかのピンホール検査装置において、前記光照射手段以外からの光を前記第1の光検出手段及び前記第2の光検出手段に入射させない遮光手段を備えたことを特徴とするものである。
また、請求項5の発明は、請求項1乃至4のいずれかのピンホール検査装置において、前記第1の光検出手段で照射光を検出可能な輝度調整用の位置と、前記第2の光検出手段で照射光を検出可能な検査用の位置との間で、前記光照射手段を移動させる移動手段を備えたことを特徴とするものである。
また、請求項6の発明は、請求項1乃至4のいずれかのピンホール検査装置において、前記被検査物を通過しない照射光を前記第1の光検出手段で検出可能な輝度調整用の位置と、前記被検査物を通過した照射光を前記第2の光検出手段で検出可能な検査用の位置との間で、前記被検査物と前記第1の光検出手段及び前記第2の光検出手段とを移動させる移動手段を備えたことを特徴とするものである。
また、請求項7の発明は、請求項1乃至6のいずれかのピンホール検査装置において、前記光照射手段と前記被検査物の間に、前記光照射手段から照射される照射光を拡散する光拡散手段を備えたことを特徴とするものである。
In order to achieve the above object, the invention of claim 1 is a pinhole inspection apparatus for inspecting the presence or absence of a pinhole in the inspection object by detecting light transmitted through the inspection object. A light irradiating means having a plurality of light sources arranged side by side so as to be able to irradiate light in a planar shape with respect to an object, and the light irradiating means capable of adjusting the brightness of each of the light sources independently from each other in a plurality of gradations; First light detection means for detecting the irradiation light irradiated in a planar shape by the plurality of light sources, and based on the detection result of the first light detection means, in a planar shape by the plurality of light sources of the light irradiation means The brightness adjustment means for adjusting the brightness of each of the plurality of light sources in a plurality of gradations so that the amount of irradiated light to be irradiated is uniform on the irradiation surface, and the brightness of the plurality of light sources is adjusted by the brightness adjustment means Planar from the light irradiation means A second light detecting means for detecting the leakage light that has passed through the object to be inspected is Isa, it is characterized in that it comprises a.
The invention according to claim 2 is the pinhole inspection apparatus according to claim 1, wherein the light emitting portions in each of the plurality of light sources of the light irradiation means are smaller than the diameter of the pinhole in the inspection object. Is.
Further, the invention according to claim 3 is the pinhole inspection apparatus according to claim 1 or 2, wherein the first light detection means has the spatial resolution equivalent to or finer than the spatial resolution of the irradiation light by the light irradiation means. It is characterized by detecting light.
According to a fourth aspect of the present invention, in the pinhole inspection apparatus according to any one of the first to third aspects, light from other than the light irradiation means is incident on the first light detection means and the second light detection means. It is characterized by having a light shielding means that does not allow it.
According to a fifth aspect of the present invention, there is provided the pinhole inspection apparatus according to any one of the first to fourth aspects, wherein the first light detecting means can detect the irradiation light and the second light. A moving means for moving the light irradiating means between inspection positions where the irradiating light can be detected by the detecting means is provided.
According to a sixth aspect of the present invention, in the pinhole inspection apparatus according to any one of the first to fourth aspects, the brightness adjusting position at which the first light detecting means can detect the irradiation light that does not pass through the inspection object. And the inspection object, the first light detection means, and the second light between the inspection position where the irradiation light that has passed through the inspection object can be detected by the second light detection means. A moving means for moving the detecting means is provided.
The invention according to claim 7 is the pinhole inspection apparatus according to any one of claims 1 to 6, wherein the irradiation light irradiated from the light irradiation means is diffused between the light irradiation means and the inspection object. A light diffusing means is provided.

本発明によれば、光照射手段の複数の光源から被検査物に対して面状に光を照射することにより、被検査物の比較的広い面積に光を照射してピンホールの有無を検査することができる。しかも、その検査に先立って、光照射手段の複数の光源それぞれの輝度を以下のように互いに独立に複数階調で調整することができる。まず、第1の光検出手段により、光照射手段の複数の光源によって面状に照射される照射光が検出される。そして、その第1の光検出手段の検出結果に基づいて、光照射手段の複数の光源によって面状に照射される照射光の光量が照射面において均一になるように前記複数の光源それぞれの輝度が複数階調で調整される。このように面状に照射される照射光の光量が照射面において均一になった状態で、光照射手段から面状に照射され被検査物を透過した漏れ光を第2の光検出手段で検出することにより、ピンホールの場所によらず均一な検査感度で精度よくピンホールの有無を検査できる。よって、本発明によれば、被検査物の比較的広い面積に光を照射して検査する場合であっても、ピンホールの場所によらず均一な検査感度で精度よくピンホールの有無を検査することができる。   According to the present invention, a plurality of light sources of the light irradiating means irradiates light on the inspection object in a planar shape, thereby irradiating light on a relatively large area of the inspection object to inspect for the presence of pinholes. can do. In addition, prior to the inspection, the brightness of each of the plurality of light sources of the light irradiation means can be adjusted in a plurality of gradations independently of each other as follows. First, the irradiation light irradiated in a planar shape by the plurality of light sources of the light irradiation means is detected by the first light detection means. Then, based on the detection result of the first light detection means, the brightness of each of the plurality of light sources is such that the amount of irradiation light irradiated in a plane by the plurality of light sources of the light irradiation means is uniform on the irradiation surface. Are adjusted in multiple tones. In such a state that the amount of irradiation light irradiated in a plane is uniform on the irradiation surface, the second light detection unit detects leakage light that is irradiated in a plane from the light irradiation unit and transmitted through the inspection object. By doing so, the presence or absence of pinholes can be accurately inspected with uniform inspection sensitivity regardless of the location of the pinholes. Therefore, according to the present invention, even when inspecting by irradiating a relatively large area of an object to be inspected, the presence or absence of a pinhole is inspected accurately with a uniform inspection sensitivity regardless of the location of the pinhole. can do.

本発明の一実施形態に係るピンホール検査装置の要部構成の一例を示す説明図。Explanatory drawing which shows an example of a principal part structure of the pinhole inspection apparatus which concerns on one Embodiment of this invention. 光照射装置と光源調整用の光検出装置との関係を示す模式図。The schematic diagram which shows the relationship between a light irradiation apparatus and the light detection apparatus for light source adjustment. (a)〜(c)は照明光の照度ムラ補正の様子を示す説明図。(A)-(c) is explanatory drawing which shows the mode of the illumination intensity nonuniformity correction of illumination light. 本発明の他の実施形態に係るピンホール検査装置の要部構成の一例を示す説明図。Explanatory drawing which shows an example of a principal part structure of the pinhole inspection apparatus which concerns on other embodiment of this invention.

以下、本発明の実施の形態を図面に基づいて説明する。なお、以下に示す実施形態は、特許請求の範囲に記載された発明の内容を何ら限定するものではない。また、ここでピンホールと述べているのは、被検査物に存在している照明光を透過可能な貫通孔等の孔部である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the embodiment shown below does not limit the content of the invention described in the claim at all. In addition, what is described as a pinhole here is a hole such as a through-hole that can transmit illumination light existing in the inspection object.

図1は本発明の一実施形態に係るピンホール検査装置の要部構成の一例を示す説明図である。
図1において、本実施形態のピンホール検査装置は、遮光手段としての遮光部材20と、被検査物10を保持する被検査物保持部22と、第1の光検出手段としての光源調整用の光検出装置30と、第2の光検出装置としてのピンホール検査用の光検出装置31と、光照射手段としての光照射装置40と、光照射装置40を移動させる移動手段としての移動装置50と、制御手段としての制御部100とを備えている。
FIG. 1 is an explanatory view showing an example of a configuration of a main part of a pinhole inspection apparatus according to an embodiment of the present invention.
In FIG. 1, the pinhole inspection apparatus according to the present embodiment includes a light shielding member 20 as a light shielding unit, an inspection object holding unit 22 that holds an inspection object 10, and a light source adjustment as a first light detection unit. The light detection device 30, the light detection device 31 for pinhole inspection as the second light detection device, the light irradiation device 40 as the light irradiation means, and the moving device 50 as the moving means for moving the light irradiation device 40 And a control unit 100 as a control means.

遮光部材20は、被検査物10の検査領域のサイズに相当する開口部20aを有し、光照射装置40以外からの光を光源調整用の光検出装置30及びピンホール検査用の光検出装置31に入射させないように遮光する。   The light shielding member 20 has an opening 20a corresponding to the size of the inspection area of the object to be inspected 10, and light from other than the light irradiation device 40 is detected by a light detection device 30 for light source adjustment and a light detection device for pinhole inspection. The light is shielded so that it does not enter 31.

光源調整用の光検出装置30は、光照射装置40の複数の光源によって面状に照射される照射光を、各光源からの光を識別可能な空間分解能で検出する。すなわち、光源調整用の光検出装置30は、光照射装置40による照射光の空間分解能と同等又はより細かい空間分解能で照射光を検出することができる。光源調整用の光検出装置30は、例えばCCDカメラ、CMOSカメラ、デジタルカメラで構成される。ピンホール検査用の光検出装置31は、前記複数の光源の輝度が調整された光照射装置40から面状に照射され被検査物10を透過した漏れ光を一括して検出する。ピンホール検査用の光検出装置31は、例えば光電子増倍管又は照度計で構成される。なお、図示の構成例では、光源調整用の光検出装置30及びピンホール検査用の光検出装置31は固定配置されている。   The light detection device 30 for light source adjustment detects irradiation light irradiated in a planar shape by a plurality of light sources of the light irradiation device 40 with a spatial resolution capable of identifying light from each light source. That is, the light detection device 30 for adjusting the light source can detect the irradiation light with a spatial resolution equal to or finer than the spatial resolution of the irradiation light by the light irradiation device 40. The light detection device 30 for light source adjustment is constituted by, for example, a CCD camera, a CMOS camera, or a digital camera. The light detection device 31 for pinhole inspection collectively detects leaked light that is irradiated in a planar shape from the light irradiation device 40 in which the brightness of the plurality of light sources is adjusted and transmitted through the inspection object 10. The photodetection device 31 for pinhole inspection is composed of, for example, a photomultiplier tube or an illuminometer. In the illustrated configuration example, the light detection device 30 for light source adjustment and the light detection device 31 for pinhole inspection are fixedly arranged.

光照射装置40は、例えば液晶表示装置で構成され、被検査物10に対して面状に光を照射可能に並設された複数の光源を有する。光照射装置40の複数の光源それぞれの輝度は、輝度可変部42により互いに独立に複数階調で調整することができる。ここで、上記「輝度」は、平面状の光源がある方向に単位立体角あたりに放射する光の光源における単位面積あたりの明るさであり、単位はカンデラ毎平方メートル(cd/m)で表される。 The light irradiation device 40 is composed of, for example, a liquid crystal display device, and has a plurality of light sources arranged in parallel so as to be able to irradiate light on the inspection object 10 in a planar shape. The brightness of each of the plurality of light sources of the light irradiation device 40 can be adjusted by a brightness varying unit 42 in a plurality of gradations independently of each other. Here, the “brightness” is the brightness per unit area of the light source that emits light per unit solid angle in the direction in which the planar light source is present, and the unit is expressed in candela per square meter (cd / m 2 ). Is done.

光源調整用の光検出装置30を、近年の高解像度化が著しいCCDカメラ、CMOSカメラ、デジタルカメラで構成し、光照射装置40を、近年の高解像度化が著しい液晶表示装置で構成することにより、光照射装置40の複数の光源間のピッチが検査対象のピンホールの孔径より小さくなり、且つ光源調整用の光検出装置30の分解能が光照射装置40と同等以上になる。これにより、被検査物10のピンホールの孔径より小さい分解能での照度ムラの補正が可能となっている。   The light detection device 30 for adjusting the light source is composed of a CCD camera, a CMOS camera, and a digital camera whose resolution is remarkable in recent years, and the light irradiation device 40 is composed of a liquid crystal display device whose resolution is remarkable in recent years. The pitch between the plurality of light sources of the light irradiation device 40 is smaller than the hole diameter of the pinhole to be inspected, and the resolution of the light detection device 30 for adjusting the light source is equal to or higher than that of the light irradiation device 40. Thereby, it is possible to correct illuminance unevenness with a resolution smaller than the hole diameter of the pinhole of the inspection object 10.

移動装置50は、光源調整用の光検出装置30で照射光を検出可能な輝度調整用の位置(図中の符号40、20の位置)と、ピンホール検査用の光検出装置31で照射光を検出可能な検査用の位置(図中の符号41、21の位置)との間で、光照射装置40と遮光部材20とを一体的に移動させることができる。   The moving device 50 includes a brightness adjustment position (positions 40 and 20 in the drawing) where the irradiation light can be detected by the light source adjustment light detection device 30, and a light detection device 31 for pinhole inspection. It is possible to move the light irradiation device 40 and the light shielding member 20 integrally between the inspection positions (positions of reference numerals 41 and 21 in the figure) that can be detected.

なお、図示の構成例では、光照射装置40と遮光部材20とを一体的に移動させているが、光照射装置40及び遮光部材20を固定配置しておき、被検査物10と光源調整用の光検出装置30及びピンホール検査用の光検出装置31とを一体的に移動させるように構成してもよい。この場合、被検査物10を通過しない照射光を光源調整用の光検出装置30で検出可能な輝度調整用の位置と、被検査物10を通過した照射光をピンホール検査用の光検出装置31で検出可能な検査用の位置との間で、被検査物10と光検出装置30、31とを移動させる。   In the illustrated configuration example, the light irradiation device 40 and the light shielding member 20 are integrally moved. However, the light irradiation device 40 and the light shielding member 20 are fixedly arranged so that the inspection object 10 and the light source are adjusted. The light detection device 30 and the pinhole inspection light detection device 31 may be configured to move integrally. In this case, the brightness adjustment position where the light detection device 30 for adjusting the light source can detect the irradiation light that does not pass through the inspection object 10, and the light detection device for pinhole inspection that uses the irradiation light that has passed through the inspection object 10. The inspection object 10 and the light detection devices 30 and 31 are moved between the inspection positions detectable by 31.

制御部100は、例えばCPU、ROM、RAMなどで構成され、所定の制御プログラムが読み込まれて実行されることにより、光源調整用の光検出装置30の検出結果に基づいて、光照射装置40の複数の光源によって面状に照射される照射光の光量である照度が照射面において均一になるように複数の光源それぞれの輝度を複数階調で調整する輝度調整手段として機能する。なお、上記「照度」は、平面状の物体に照射された光の明るさを表す物理量であり、単位面積あたりに照射された光束と等しい。単位は、ルクス(lx)またはルーメン毎平方メートル(lm/m)で表される。 The control unit 100 is configured by, for example, a CPU, a ROM, a RAM, and the like, and a predetermined control program is read and executed, so that the light irradiation device 40 is configured based on the detection result of the light detection device 30 for light source adjustment. It functions as a luminance adjusting unit that adjusts the luminance of each of the plurality of light sources with a plurality of gradations so that the illuminance, which is the amount of irradiation light irradiated in a plane by the plurality of light sources, is uniform on the irradiation surface. The “illuminance” is a physical quantity representing the brightness of light irradiated on a planar object, and is equal to the light beam irradiated per unit area. Units are expressed in lux (lx) or lumens per square meter (lm / m 2 ).

また、図示の構成例において、制御部100は、第1の検出値記憶部60と第2の検出値記憶部61と演算処理部70とを備える。第1の検出値記憶部60は、光源調整用の光検出装置30で検出された検出値を記憶し、第2の検出値記憶部61はピンホール検査用の光検出装置31で検出された検出値を記憶する。また、演算処理部70は、第1の検出値記憶部60から読み出した光源調整用の光検出装置30で検出された検出値に基づいて、光照射装置40の複数の光源ごとに照度ムラ補正後の光量の輝度を算出し、その算出値を前記輝度可変部42へ送る。輝度可変部42は、演算処理部70から受けた照度ムラ補正後の光量の輝度の算出値に基づいて、光照射装置40の複数の光源それぞれの輝度を制御する。   In the illustrated configuration example, the control unit 100 includes a first detection value storage unit 60, a second detection value storage unit 61, and an arithmetic processing unit 70. The first detection value storage unit 60 stores the detection value detected by the light detection device 30 for light source adjustment, and the second detection value storage unit 61 is detected by the light detection device 31 for pinhole inspection. The detected value is stored. The arithmetic processing unit 70 also corrects illuminance unevenness for each of the plurality of light sources of the light irradiation device 40 based on the detection values detected by the light source adjustment light detection device 30 read from the first detection value storage unit 60. The luminance of the subsequent light amount is calculated, and the calculated value is sent to the luminance variable unit 42. The luminance variable unit 42 controls the luminance of each of the plurality of light sources of the light irradiation device 40 based on the calculated value of the luminance of the light amount after illuminance unevenness correction received from the arithmetic processing unit 70.

なお、光照射装置40の各光源の光量の輝度の階調、及び、光源調整用の光検出装置30の検出値の輝度の階調は、一般的には256階調である。   Note that the luminance gradation of the light amount of each light source of the light irradiation device 40 and the luminance gradation of the detection value of the light detection device 30 for light source adjustment are generally 256 gradations.

図2は、光照射装置40と光源調整用の光検出装置30との関係を、照明方向を縦方向下向きとした場合に横方向から見た模式図である。図2において、光照射装置40は、複数の光源43aの集合体43で構成され、光源調整用の光検出装置30は、複数の受光部32aの集合体32で構成されている。光源調整用の光検出装置30は、CCDカメラ等で構成されるが、CCDカメラ等は複数の画素がマトリックス状に配列されているので、受光部の集合体32は複数の画素に相当し、単体の受光部32aは1画素に相当する。そして、単体の受光部32aは、1画素毎に受光した光量の複数階調の輝度を検出する。また、光源についても、光照射装置40に液晶表示装置を使用するため、単体の光源43aは1画素に相当すると見なすことができる。   FIG. 2 is a schematic view of the relationship between the light irradiation device 40 and the light detection device 30 for adjusting the light source viewed from the lateral direction when the illumination direction is downward in the vertical direction. In FIG. 2, the light irradiation device 40 is composed of an assembly 43 of a plurality of light sources 43a, and the light detection device 30 for light source adjustment is composed of an assembly 32 of a plurality of light receiving portions 32a. The light detection device 30 for adjusting the light source is composed of a CCD camera or the like. Since the CCD camera or the like has a plurality of pixels arranged in a matrix, the light receiving unit aggregate 32 corresponds to the plurality of pixels. The single light receiving unit 32a corresponds to one pixel. The single light receiving unit 32a detects the luminances of a plurality of gradations of the amount of light received for each pixel. As for the light source, since a liquid crystal display device is used for the light irradiation device 40, the single light source 43a can be regarded as corresponding to one pixel.

ここで、光照射装置40の空間分解能と光源調整用の光検出装置30の空間分解能が等しい場合は、単体の光源43aの光量の輝度を光源調整用の光検出装置30で最も近接した1画素で検出する。しかし、光照射装置40の空間分解能よりも光源調整用の光検出装置30の空間分解能が高い場合は、単体の光源43aに対して最も近接した1画素とその周囲の複数の画素で光量の輝度を検出し、それらの検出値を平均化して算出し、その算出した値を光源43aの光量の輝度とすることで、より細かい分解能での光源43aの光量の輝度を1光源毎に得ることができる。また、光源調整用の光検出装置30は、複数の光源43aのすべてについて光量の輝度を検出する必要があるので、複数の光源43aの集合体のサイズと同等又はそれ以上の範囲での輝度の検出が必要である。   Here, when the spatial resolution of the light irradiation device 40 and the spatial resolution of the light detection device 30 for light source adjustment are equal, the luminance of the light amount of the single light source 43a is closest to one pixel in the light detection device 30 for light source adjustment. Detect with. However, when the spatial resolution of the light detection device 30 for adjusting the light source is higher than the spatial resolution of the light irradiation device 40, the luminance of the light amount at one pixel closest to the single light source 43 a and a plurality of surrounding pixels. , The detected values are averaged and calculated, and the calculated value is used as the luminance of the light amount of the light source 43a, whereby the luminance of the light amount of the light source 43a with finer resolution can be obtained for each light source. it can. Further, since the light detection device 30 for light source adjustment needs to detect the luminance of the light quantity for all of the plurality of light sources 43a, the luminance in the range equal to or larger than the size of the aggregate of the plurality of light sources 43a. Detection is necessary.

図3は、照明光の照度ムラ補正の様子を示す図である。図3(a)は、照度ムラ補正前の照度分布を示す図、図3(b)は、照明手段の光量について画素単位での輝度の階調分布を示す図、図3(c)は、照度ムラ補正後の照度分布を示す図である。
光照射装置40にて単体の光源を画素単位に相当するとして、画素のある直線上の光量を全画素で均一な輝度にした場合、その照明光の照度分布が、図3(a)で表すように中央部では所望の照度より高く、両端で低いとする。そのような照度分布の場合、照明光量のある直線上の1画素毎の輝度を、照度分布との増減を逆にして、中央部で図3(b)で表すように中央部では輝度を下げ、両端では輝度を上げる。そのように照明光量の輝度を変えた場合、照度分布が図3(a)から図3(c)に変化してほぼ均一となり所望の照度がある直線上の全画素内で得られる。
この場合、照明光量のある直線上はマトリックス状の画素のX方向又はY方向の任意の一列となるが、もしX、Y方向を合成した全画素についての照度ムラ補正を行う場合は、マトリックス状の全画素内の平均照度が所望の照度と最も差が小さくなるように、1画素毎に照明光量の輝度を調整する。
ただし、以上の図3について、本実施形態のピンホール検査装置における照度ムラ補正では、照度分布ではなく、光源調整用の光検出装置30で得られた照明光量の画素毎の輝度を用いて照度分布の代替とする。
また、図3は、光照射装置40よりも光源調整用の光検出装置30の方が画素サイズ及び画素数の分解能が高い場合を例示しているが、両者の分解能が等しい場合は図3(b)の画素単位での輝度の階調分布はより滑らかになる。また、光照射装置40及び光源調整用の光検出装置30の分解能が等しい場合は、照度ムラ補正の処理が簡易化されるので、処理時間が短縮される利点がある。
FIG. 3 is a diagram illustrating a state of illuminance unevenness correction of illumination light. FIG. 3A is a diagram showing an illuminance distribution before illuminance unevenness correction, FIG. 3B is a diagram showing a gradation distribution of luminance in pixel units with respect to the amount of light of the illumination means, and FIG. It is a figure which shows the illumination intensity distribution after illumination intensity nonuniformity correction | amendment.
In the light irradiation device 40, assuming that a single light source corresponds to a pixel unit, and the amount of light on a straight line with pixels is made uniform in all pixels, the illuminance distribution of the illumination light is shown in FIG. Thus, it is assumed that the central portion is higher than the desired illuminance and lower at both ends. In the case of such an illuminance distribution, the luminance of each pixel on a straight line with the amount of illumination light is reduced in the central portion as shown in FIG. Increase brightness at both ends. When the luminance of the illumination light quantity is changed in such a manner, the illuminance distribution changes from FIG. 3A to FIG. 3C and becomes almost uniform, and is obtained in all pixels on a straight line having a desired illuminance.
In this case, on the straight line with the amount of illumination light, there is an arbitrary column in the X direction or Y direction of the matrix-like pixels, but if illuminance unevenness correction is performed for all the pixels synthesized in the X and Y directions, the matrix shape The luminance of the illumination light amount is adjusted for each pixel so that the average illuminance in all the pixels becomes the smallest difference from the desired illuminance.
However, with respect to FIG. 3 described above, in the illuminance unevenness correction in the pinhole inspection apparatus according to the present embodiment, the illuminance is obtained using not the illuminance distribution but the luminance for each pixel of the illumination light amount obtained by the light detection device 30 for light source adjustment. As an alternative to distribution.
FIG. 3 illustrates the case where the light detection device 30 for light source adjustment has a higher resolution of the pixel size and the number of pixels than the light irradiation device 40, but FIG. 3 ( The gradation distribution of luminance in pixel units in b) becomes smoother. In addition, when the resolution of the light irradiation device 40 and the light detection device 30 for adjusting the light source are equal, the processing for correcting the uneven illuminance is simplified, which has the advantage of shortening the processing time.

上記構成のピンホール検査装置におけるピンホール検査の手順は、例えば以下のとおりである。
(A1)被検査物10を被検査物保持部22にセットする。
(A2)光照射装置40及びピンホール検査用の光検出装置31を被検査物10の位置に移動する。
(A3)被検査物10を遮光部材21で遮光する。
(A4)光照射装置40の全光源を点灯する。
(A5)遮光部材21の開口部21aを通して、光照射装置40からの照明光を被検査物10に照射する。
(A6)光照射装置40からの照明光について、被検査物10を透過した光をピンホール検査用の光検出装置31で検出する。
(A7)ピンホール検査用の光検出装置31で検出した被検査物10の透過光について、その検出値を記憶する。
(A8)上記(A7)の検出値が良否判定規格値未満ならば被検査物10はピンホール無しで良品と判定し、良否判定規格値以上ならば被検査物10はピンホール有りで不良品と判定する。なお、良否判定規格値は予め決められた固定値とする。
(A9)光照射装置40の全光源を消灯する。
(A10)遮光部材21による被検査物10の遮光を解除する。
(A11)光照射装置40及びピンホール検査用の光検出装置31を、被検査物10の位置(検査用の位置)から、被検査物10を被検査物保持部22から取り外すことが可能な位置に移動する。
(A12)被検査物10を被検査物保持部22から取り外す。
The procedure of the pinhole inspection in the pinhole inspection apparatus having the above configuration is, for example, as follows.
(A1) The inspection object 10 is set in the inspection object holding part 22.
(A2) The light irradiation device 40 and the light detection device 31 for pinhole inspection are moved to the position of the inspection object 10.
(A3) The inspection object 10 is shielded from light by the light shielding member 21.
(A4) All the light sources of the light irradiation device 40 are turned on.
(A5) The object 10 is irradiated with illumination light from the light irradiation device 40 through the opening 21a of the light shielding member 21.
(A6) About the illumination light from the light irradiation apparatus 40, the light which permeate | transmitted the to-be-inspected object 10 is detected with the photon detector 31 for a pinhole test | inspection.
(A7) The detected value is memorize | stored about the transmitted light of the to-be-inspected object 10 detected with the photon detection apparatus 31 for a pinhole test | inspection.
(A8) If the detected value of (A7) is less than the pass / fail judgment standard value, the inspected object 10 is judged as a non-defective product without a pinhole, and if it is greater than the pass / fail judgment standard value, the inspected object 10 has a pinhole and is defective. Is determined. The pass / fail judgment standard value is a predetermined fixed value.
(A9) All light sources of the light irradiation device 40 are turned off.
(A10) The light shielding of the inspection object 10 by the light shielding member 21 is released.
(A11) The light irradiation device 40 and the light detection device 31 for pinhole inspection can be detached from the position of the inspection object 10 (inspection position) from the inspection object holding unit 22. Move to position.
(A12) The inspection object 10 is removed from the inspection object holder 22.

なお、被検査物10上に検査箇所が複数有る場合は、上記(A2)〜(A10)を繰り返し、被検査物10上の全検査箇所の検査が完了したら、上記(A11)及び(A12)を行う。   In addition, when there are a plurality of inspection places on the inspection object 10, the above (A2) to (A10) are repeated, and when inspection of all inspection places on the inspection object 10 is completed, the above (A11) and (A12) I do.

また、上記構成のピンホール検査装置における光照射装置40の照明光の照度ムラ補正は、被検査物10毎に、被検査物10を被検査物保持部22にセットする前に行う。   In addition, the illuminance unevenness correction of the illumination light of the light irradiation device 40 in the pinhole inspection apparatus having the above configuration is performed for each inspection object 10 before the inspection object 10 is set on the inspection object holding unit 22.

上記構成のピンホール検査装置における光照射装置40の照明光の照度ムラ補正の手順は、例えば以下のとおりである。
(B1)光照射装置40を、光源調整用の光検出装置30の位置(輝度調整用の位置)に移動する。
(B2)光照射装置40の全光源を点灯する。ただし、この際の各光源の光量は均一となるように設定する。
(B3)光照射装置40の照明光を、光源調整用の光検出装置30で検出する。
(B4)光源調整用の光検出装置30で検出した検出値を記憶する。
(B5)上記(B4)の検出値より照度ムラを算出する。
(B6)全画素の照度ムラが規格内である場合は、光照射装置40の全光源を消灯し、光照射装置40をピンホール検査用の光検出装置31の位置(検査用の位置)に移動する。
(B7)照度ムラが規格外である画素がある場合は、上記(B4)の検出値より照度ムラ補正を行い、全画素の照度ムラが規格内に入るまで上記(B3)〜(B5)を繰り返す。
The procedure for correcting the illuminance unevenness of the illumination light of the light irradiation device 40 in the pinhole inspection apparatus having the above configuration is, for example, as follows.
(B1) The light irradiation device 40 is moved to the position of the light detection device 30 for light source adjustment (position for luminance adjustment).
(B2) All light sources of the light irradiation device 40 are turned on. However, the light quantity of each light source at this time is set to be uniform.
(B3) The illumination light of the light irradiation device 40 is detected by the light detection device 30 for light source adjustment.
(B4) The detection value detected by the light detection device 30 for light source adjustment is stored.
(B5) Illuminance unevenness is calculated from the detection value of (B4) above.
(B6) When the illuminance unevenness of all the pixels is within the standard, all the light sources of the light irradiation device 40 are turned off, and the light irradiation device 40 is moved to the position of the light detection device 31 for pinhole inspection (inspection position). Moving.
(B7) When there is a pixel whose illuminance unevenness is outside the standard, the illuminance unevenness correction is performed based on the detection value of (B4), and the above (B3) to (B5) are performed until the illuminance unevenness of all the pixels falls within the standard. repeat.

また、上記構成のピンホール検査装置における濃度ムラ補正の具体的な方法は、例えば以下のとおりである。
(C1)光照射装置40の照明光を、光源調整用の光検出装置30で受光する。
(C2)光源調整用の光検出装置30の検出範囲について、輝度平均値を算出し、且つマトリックス状に輝度値を算出する。
(C3)光源調整用の光検出装置30の1画素毎に、輝度平均値とその画素の輝度値の差Aを求める。
(C4)光源調整用の光検出装置30に入射する光について、上記差Aが打ち消されるように光照射装置40の光量を各光源毎に調整する。
A specific method for correcting density unevenness in the pinhole inspection apparatus having the above-described configuration is, for example, as follows.
(C1) The illumination light of the light irradiation device 40 is received by the light detection device 30 for light source adjustment.
(C2) For the detection range of the light detection device 30 for light source adjustment, a luminance average value is calculated, and luminance values are calculated in a matrix.
(C3) For each pixel of the light detection device 30 for light source adjustment, a difference A between the luminance average value and the luminance value of the pixel is obtained.
(C4) The light quantity of the light irradiation device 40 is adjusted for each light source so that the difference A is canceled out with respect to the light incident on the light detection device 30 for light source adjustment.

なお、光照射装置40における片方向(X軸方向又はY軸方向)の光源の数が、光源調整用の光検出装置30の片方向の画素数よりも少ない場合は、光検出装置30の検出範囲全体での上記差Aの合計値が最も少なくなるように各光源の光量を調整する。
また、上記照度ムラ補正完了後に行うピンホール検査では、全画素の照度ムラが規格内となった時点の光照射装置40の各光源毎の光量設定値を使用する。
When the number of light sources in one direction (X-axis direction or Y-axis direction) in the light irradiation device 40 is smaller than the number of pixels in one direction of the light detection device 30 for light source adjustment, detection by the light detection device 30 is performed. The light quantity of each light source is adjusted so that the total value of the difference A over the entire range is minimized.
In the pinhole inspection performed after the illuminance unevenness correction is completed, the light amount setting value for each light source of the light irradiation device 40 at the time when the illuminance unevenness of all the pixels is within the standard is used.

図4は、本発明の他の実施形態に係るピンホール検査装置の要部構成の一例を示す説明図である。図1と同様な構成については同じ符号を付し、説明を省略する。
図4のピンホール検査装置では、光照射装置40と被検査物10の間に、光照射装置40から照射される照射光を拡散する光拡散手段としての光拡散板80を備えることにより、光照射装置40の1画素毎の輝度の差をより小さくし、より高精度な照度ムラ補正を行うことができる。
FIG. 4 is an explanatory diagram showing an example of a configuration of a main part of a pinhole inspection apparatus according to another embodiment of the present invention. Components similar to those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
In the pinhole inspection apparatus of FIG. 4, a light diffusing plate 80 serving as a light diffusing means for diffusing the irradiation light irradiated from the light irradiation apparatus 40 is provided between the light irradiation apparatus 40 and the object 10 to be inspected. The difference in luminance for each pixel of the irradiation device 40 can be further reduced, and more accurate unevenness correction can be performed.

以上、本実施形態によれば、被検査物10を透過した光を検出することにより被検査物10におけるピンホールの有無を検査するピンホール検査装置において、被検査物10に対して面状に光を照射可能に並設された複数の光源を有し、その複数の光源それぞれの輝度を互いに独立に複数階調で調整可能な光照射手段としての光照射装置40と、光照射装置40の複数の光源によって面状に照射される照射光を検出する第1の光検出手段としての光源調整用の光検出装置30と、光源調整用の光検出装置30の検出結果に基づいて、光照射装置40の複数の光源によって面状に照射される照射光の光量が照射面において均一になるように前記複数の光源それぞれの輝度を複数階調で調整する輝度調整手段としての制御部100と、制御手段100によって前記複数の光源の輝度が調整された光照射装置40から面状に照射され被検査物10を透過した漏れ光を検出する第2の光検出手段としてのピンホール検査用の光検出装置31と、を備える。
このピンホール検査装置では、光照射装置40の複数の光源から被検査物10に対して面状に光を照射することにより、被検査物10の比較的広い面積に光を照射してピンホールの有無を検査することができる。しかも、その検査に先立って、光照射装置40の複数の光源それぞれの輝度を以下のように互いに独立に複数階調で調整することができる。まず、光源調整用の光検出装置30により、光照射装置40の複数の光源によって面状に照射される照射光が検出される。そして、その光源調整用の光検出装置30の検出結果に基づいて、光照射装置40の複数の光源によって面状に照射される照射光の光量が照射面において均一になるように前記複数の光源それぞれの輝度が複数階調で調整される。このように面状に照射される照射光の光量が照射面において均一になった状態で、光照射装置40から面状に照射され被検査物10を透過した漏れ光をピンホール検査用の光検出装置31で検出することにより、ピンホールの場所によらず均一な検査感度で精度よくピンホールの有無を検査できる。よって、被検査物10の比較的広い面積に光を照射して検査する場合であっても、ピンホールの場所によらず均一な検査感度で精度よくピンホールの有無を検査することができる。
また、本実施形態によれば、光照射装置40の複数の光源それぞれにおける発光部は、被検査物10におけるピンホールの径よりも小さいことにより、被検査物10のピンホールの孔径より小さい分解能での照度ムラの補正が可能となる。
また、本実施形態によれば、光源調整用の光検出装置30は、光照射装置40による照射光の空間分解能と同等又はより細かい空間分解能で前記照射光を検出することにより、被検査物10のピンホールの孔径より小さい分解能での照度ムラの補正が可能となる。
また、本実施形態によれば、光照射装置40以外からの光を光源調整用の光検出装置30及びピンホール検査用の光検出装置31に入射させない遮光手段としての遮光部材21を備えることにより、光検出装置30、31による不要な光の検出を防止することができ、ピンホールの検査精度をよい高めることができる。
また、本実施形態によれば、光源調整用の光検出装置30で照射光を検出可能な輝度調整用の位置と、ピンホール検査用の光検出装置31で照射光を検出可能な検査用の位置との間で、光照射装置40を移動させる移動手段としての移動装置50を備えることにより、光検出装置30、31を固定配置した状態で、上記光照射装置40の照度ムラの補正及びピンホール検査が可能になる。
また、本実施形態によれば、被検査物10を通過しない照射光を光源調整用の光検出装置30で検出可能な輝度調整用の位置と、被検査物10を通過した照射光をピンホール検査用の光検出装置31で検出可能な検査用の位置との間で、被検査物10と光検出装置30、31とを移動させる移動手段を備えることにより、光照射装置40を固定配置した状態で、上記光照射装置40の照度ムラの補正及びピンホール検査が可能になる。
また、本実施形態によれば、光照射装置40と被検査物10の間に、光照射装置40から照射される照射光を拡散する光拡散手段としての光拡散板80を備えることにより、光照射装置40の1画素毎の輝度の差をより小さくし、より高精度な照度ムラ補正を行うことができる。
As described above, according to the present embodiment, in the pinhole inspection apparatus that inspects the presence or absence of the pinhole in the inspection object 10 by detecting the light transmitted through the inspection object 10, the inspection object 10 is planar. A light irradiation device 40 having a plurality of light sources arranged in parallel so as to be able to irradiate light, and capable of adjusting the luminance of each of the plurality of light sources independently of each other in a plurality of gradations; Based on the detection results of the light source adjustment light detection device 30 as the first light detection means for detecting the irradiation light irradiated in a planar shape by the plurality of light sources, and the light detection device 30 for light source adjustment light irradiation. A control unit 100 as brightness adjusting means for adjusting the brightness of each of the plurality of light sources with a plurality of gradations so that the amount of irradiation light irradiated in a plane by the plurality of light sources of the apparatus 40 is uniform on the irradiation surface; Control means 1 A light detection device for pinhole inspection as a second light detection means for detecting leakage light that is irradiated in a planar shape from the light irradiation device 40 in which the brightness of the plurality of light sources is adjusted by 0 and is transmitted through the inspection object 10 31.
In this pinhole inspection apparatus, a plurality of light sources of the light irradiation device 40 irradiate light on the inspection object 10 in a planar shape, thereby irradiating light on a relatively large area of the inspection object 10 and pinholes. The presence or absence can be inspected. In addition, prior to the inspection, the luminance of each of the plurality of light sources of the light irradiation device 40 can be adjusted in a plurality of gradations independently of each other as follows. First, the light detection device 30 for light source adjustment detects irradiation light irradiated in a planar shape by a plurality of light sources of the light irradiation device 40. Then, based on the detection result of the light detection device 30 for adjusting the light source, the plurality of light sources so that the amount of irradiation light irradiated in a planar shape by the plurality of light sources of the light irradiation device 40 is uniform on the irradiation surface. Each luminance is adjusted by a plurality of gradations. In this way, in a state where the amount of irradiation light irradiated in a planar shape is uniform on the irradiation surface, the leaked light that has been irradiated in a planar shape from the light irradiation device 40 and transmitted through the inspection object 10 is used as light for pinhole inspection. By detecting with the detection device 31, the presence or absence of a pinhole can be accurately inspected with uniform inspection sensitivity regardless of the location of the pinhole. Therefore, even if the inspection is performed by irradiating light on a relatively large area of the object to be inspected 10, the presence or absence of the pinhole can be accurately inspected with uniform inspection sensitivity regardless of the location of the pinhole.
In addition, according to the present embodiment, the light emitting portions in each of the plurality of light sources of the light irradiation device 40 are smaller than the diameter of the pinhole in the inspection object 10, thereby reducing the resolution smaller than the diameter of the pinhole in the inspection object 10. Illuminance unevenness can be corrected in
In addition, according to the present embodiment, the light detection device 30 for adjusting the light source detects the irradiation light with a spatial resolution equal to or finer than the spatial resolution of the irradiation light by the light irradiation device 40, thereby inspecting the object 10. Illuminance unevenness can be corrected with a resolution smaller than the diameter of the pinhole.
Further, according to the present embodiment, by including the light shielding member 21 as a light shielding means that prevents light from other than the light irradiation device 40 from entering the light detection device 30 for light source adjustment and the light detection device 31 for pinhole inspection. The detection of unnecessary light by the light detection devices 30 and 31 can be prevented, and the pinhole inspection accuracy can be improved.
Further, according to the present embodiment, the brightness adjustment position where the irradiation light can be detected by the light detection device 30 for light source adjustment, and the inspection light where the irradiation light can be detected by the light detection device 31 for pinhole inspection. By providing the moving device 50 as a moving means for moving the light irradiation device 40 between the positions, the light irradiation device 40 can be corrected for illuminance unevenness and pins in a state where the light detection devices 30 and 31 are fixedly arranged. Hall inspection becomes possible.
Further, according to the present embodiment, the position for brightness adjustment where the light that does not pass through the inspection object 10 can be detected by the light detection device 30 for light source adjustment, and the irradiation light that has passed through the inspection object 10 are pinholes. The light irradiation device 40 is fixedly arranged by providing a moving means for moving the inspection object 10 and the light detection devices 30 and 31 between the inspection positions detectable by the inspection light detection device 31. In this state, it is possible to correct the illuminance unevenness and the pinhole inspection of the light irradiation device 40.
In addition, according to the present embodiment, the light diffusing plate 80 serving as the light diffusing means for diffusing the irradiation light irradiated from the light irradiation device 40 is provided between the light irradiation device 40 and the object 10 to be inspected. The difference in luminance for each pixel of the irradiation device 40 can be further reduced, and more accurate unevenness correction can be performed.

10 被検査物
20(21) 遮光部材
20a(21a) 開口
22 被検査物保持部
30 光源調整用の光検出装置
31 ピンホール検査用の光検出装置
40(41) 光照射装置
50 移動装置
100 制御部
DESCRIPTION OF SYMBOLS 10 Inspection object 20 (21) Light shielding member 20a (21a) Opening 22 Inspection object holding | maintenance part 30 Photodetector 31 for light source adjustment Photodetector 40 for pinhole inspection (41) Light irradiation apparatus 50 Moving apparatus 100 Control Part

特開平11−326239号公報JP 11-326239 A 特開2004−191324号公報JP 2004-191324 A

Claims (7)

被検査物を透過した光を検出することにより、前記被検査物におけるピンホールの有無を検査するピンホール検査装置であって、
被検査物に対して面状に光を照射可能に並設された複数の光源を有し、その複数の光源それぞれの輝度を互いに独立に複数階調で調整可能な光照射手段と、
前記光照射手段の複数の光源によって面状に照射される照射光を検出する第1の光検出手段と、
前記第1の光検出手段の検出結果に基づいて、前記光照射手段の複数の光源によって面状に照射される照射光の光量が照射面において均一になるように前記複数の光源それぞれの輝度を複数階調で調整する輝度調整手段と、
前記輝度調整手段によって前記複数の光源の輝度が調整された前記光照射手段から面状に照射され被検査物を透過した漏れ光を検出する第2の光検出手段と、
を備えたことを特徴とするピンホール検査装置。
A pinhole inspection apparatus for inspecting the presence or absence of pinholes in the inspection object by detecting light transmitted through the inspection object,
A light irradiation means having a plurality of light sources arranged side by side so as to be able to irradiate light on the object to be inspected, and capable of adjusting the brightness of each of the plurality of light sources independently of each other in a plurality of gradations;
First light detection means for detecting irradiation light irradiated in a planar shape by a plurality of light sources of the light irradiation means;
Based on the detection result of the first light detection means, the brightness of each of the plurality of light sources is adjusted so that the amount of irradiation light irradiated in a plane by the plurality of light sources of the light irradiation means is uniform on the irradiation surface. Brightness adjustment means for adjusting in multiple gradations;
Second light detection means for detecting leakage light that is irradiated in a planar shape from the light irradiation means whose brightness of the plurality of light sources has been adjusted by the brightness adjustment means and transmitted through the inspection object;
A pinhole inspection apparatus comprising:
請求項1のピンホール検査装置において、
前記光照射手段の複数の光源それぞれにおける発光部は、前記被検査物におけるピンホールの径よりも小さいことを特徴とするピンホール検査装置。
In the pinhole inspection apparatus according to claim 1,
The pinhole inspection apparatus according to claim 1, wherein a light emitting portion in each of the plurality of light sources of the light irradiation unit is smaller than a diameter of a pinhole in the inspection object.
請求項1又は2のピンホール検査装置において、
前記第1の光検出手段は、前記光照射手段による照射光の空間分解能と同等又はより細かい空間分解能で前記照射光を検出することを特徴とするピンホール検査装置。
In the pinhole inspection apparatus according to claim 1 or 2,
The first light detection unit detects the irradiation light with a spatial resolution equal to or finer than the spatial resolution of the irradiation light by the light irradiation unit.
請求項1乃至3のいずれかのピンホール検査装置において、
前記光照射手段以外からの光を前記第1の光検出手段及び前記第2の光検出手段に入射させない遮光手段を備えたことを特徴とするピンホール検査装置。
In the pinhole inspection device according to any one of claims 1 to 3,
A pinhole inspection apparatus, comprising: a light blocking unit that prevents light from other than the light irradiation unit from entering the first light detection unit and the second light detection unit.
請求項1乃至4のいずれかのピンホール検査装置において、
前記第1の光検出手段で照射光を検出可能な輝度調整用の位置と、前記第2の光検出手段で照射光を検出可能な検査用の位置との間で、前記光照射手段を移動させる移動手段を備えたことを特徴とするピンホール検査装置。
In the pinhole inspection apparatus in any one of Claims 1 thru | or 4,
The light irradiation means is moved between a brightness adjustment position where the irradiation light can be detected by the first light detection means and an inspection position where the irradiation light can be detected by the second light detection means. A pinhole inspection device comprising a moving means for moving the pinhole.
請求項1乃至4のいずれかのピンホール検査装置において、
前記被検査物を通過しない照射光を前記第1の光検出手段で検出可能な輝度調整用の位置と、前記被検査物を通過した照射光を前記第2の光検出手段で検出可能な検査用の位置との間で、前記被検査物と前記第1の光検出手段及び前記第2の光検出手段とを移動させる移動手段を備えたことを特徴とするピンホール検査装置。
In the pinhole inspection apparatus in any one of Claims 1 thru | or 4,
A position for brightness adjustment that allows the first light detection means to detect the irradiation light that does not pass through the inspection object, and an inspection that enables the second light detection means to detect the irradiation light that has passed through the inspection object. A pinhole inspection apparatus comprising: a moving means for moving the object to be inspected and the first light detecting means and the second light detecting means between positions.
請求項1乃至6のいずれかのピンホール検査装置において、
前記光照射手段と前記被検査物の間に、前記光照射手段から照射される照射光を拡散する光拡散手段を備えたことを特徴とするピンホール検査装置。
In the pinhole inspection apparatus according to any one of claims 1 to 6,
A pinhole inspection apparatus comprising: a light diffusing unit that diffuses irradiation light irradiated from the light irradiation unit between the light irradiation unit and the inspection object.
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KR101661986B1 (en) * 2015-04-22 2016-10-11 프리시젼바이오 주식회사 diagnostic apparatus
WO2017111414A1 (en) * 2015-12-24 2017-06-29 주식회사 포스코 Pinhole or hole detection device and method
KR101767784B1 (en) 2015-12-24 2017-08-14 주식회사 포스코 A device and a method for detecting a hole or a pin hole
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EP3396361A4 (en) * 2015-12-24 2019-01-30 Posco Pinhole or hole detection device and method
CN111208148A (en) * 2020-02-21 2020-05-29 凌云光技术集团有限责任公司 Dig hole screen light leak defect detecting system
CN113945515A (en) * 2020-07-17 2022-01-18 捷将科技有限公司 Detection level inspection device and inspection method for charge coupled device detector
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