JP6772406B2 - Inspection device and inspection method for the top surface of the mouth - Google Patents
Inspection device and inspection method for the top surface of the mouth Download PDFInfo
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Description
本発明は、樹脂成形ボトルやそのプリフォームといった成形体における口部の天面を検査する装置及び方法に関する。 The present invention relates to an apparatus and method for inspecting the top surface of a mouth portion of a molded product such as a resin molded bottle or a preform thereof.
樹脂成形ボトル等の成形体に設けられた口部の天面を検査する装置として、照明装置から射出された平行光束の照明光をその光軸が天面と直交するように導いて天面を照明しつつ、その天面をこれと直交する方向から撮影し、得られた画像に基づいて天面を検査する検査装置が知られている（例えば特許文献１参照）。 As a device for inspecting the top surface of the mouth portion provided on a molded body such as a resin molded bottle, the top surface is guided by guiding the illumination light of the parallel luminous flux emitted from the lighting device so that the optical axis is orthogonal to the top surface. There is known an inspection device that photographs the top surface from a direction orthogonal to the top surface while illuminating the top surface and inspects the top surface based on the obtained image (see, for example, Patent Document 1).
天面を平行光束の照明光で照明する従来の検査装置では、天面の照度を均一化して精度が高い検査を行なうことが可能である。しかしながら、照明光の直進性が高いため、金型の形状誤差等に起因して天面の一部に許容範囲内の形状誤差が存在する場合でも、その部分で反射光が乱れ、当該部分が暗部として撮影されることがある。口部天面の検査では、例えば天面の外周の一部に丸みを帯びたいわゆる天面だれと呼ばれる不良箇所が存在するか否かといった検査が行われるが、そのような不良箇所も暗部として撮影されるため、得られた画像中の暗部が不良箇所なのか許容範囲内の誤差を伴う箇所なのかを見分けることが困難となり、検査精度が低下するおそれがある。 In a conventional inspection device that illuminates the top surface with illumination light of a parallel luminous flux, it is possible to perform a highly accurate inspection by making the illuminance of the top surface uniform. However, since the straightness of the illumination light is high, even if there is a shape error within the allowable range in a part of the top surface due to the shape error of the mold or the like, the reflected light is disturbed in that part, and the part concerned It may be photographed as a dark area. In the inspection of the top surface of the mouth, for example, whether or not there is a rounded so-called top surface error on a part of the outer circumference of the top surface is inspected. Since the image is taken, it becomes difficult to distinguish whether the dark part in the obtained image is a defective part or a part with an error within the permissible range, and the inspection accuracy may decrease.
そこで、本発明は成形体の口部の天面を精度よく検査することが可能な検査装置及び検査方法を提供することを目的とする。 Therefore, an object of the present invention is to provide an inspection device and an inspection method capable of accurately inspecting the top surface of the mouth of a molded product.
本発明の一態様に係る口部天面の検査装置（１）は、成形体（２）の口部（３）の天面（３ａ）を当該天面と直交する方向から撮影するように設けられた撮影手段（５）と、前記天面に対して当該天面と直交する光軸を有する照明光を照射するように設けられた照明手段（６）とを備え、前記照明手段は、平行光束の照明光を射出する光源（１０）と、前記光源と前記天面との間に介在し、前記光源からの照明光を拡散させる拡散手段（１１）とを有し、前記拡散手段にて拡散された照明光が前記天面に照射されるように構成されたものである。 The mouth portion top surface inspection device (1) according to one aspect of the present invention is provided so as to photograph the top surface (3a) of the mouth portion (3) of the molded body (2) from a direction orthogonal to the top surface. The imaging means (5) provided and the illumination means (6) provided so as to irradiate the top surface with illumination light having an optical axis orthogonal to the top surface, and the illumination means are parallel to each other. It has a light source (10) that emits illumination light of a light beam and a diffusing means (11) that is interposed between the light source and the top surface to diffuse the illumination light from the light source. It is configured so that the diffused illumination light is applied to the top surface.
上記態様の検査装置においては、照明手段の光源から平行光束の照明光を射出させ、その照明光を拡散手段により拡散させているので、照明光の拡散範囲を適切に設定することにより、照明光に適度の直進性と拡散性とを与えつつ口部の天面に均一な照明光を導くことができる。したがって、口部の天面における形状誤差部分に関しては、照明光の拡散性を利用して撮像手段に十分な反射光を導いて当該部分の画像中における明度を増加させ、その一方、天面だれのような不良箇所に関しては、照明光の直進性を利用してその部分を画像中に暗部として映し出すことができる。これにより、天面の検査精度を向上させることができる。 In the inspection device of the above aspect, the illumination light of the parallel light beam is emitted from the light source of the illumination means, and the illumination light is diffused by the diffusion means. Therefore, by appropriately setting the diffusion range of the illumination light, the illumination light It is possible to guide uniform illumination light to the top surface of the mouth while giving appropriate straightness and diffusivity. Therefore, with respect to the shape error portion on the top surface of the mouth portion, sufficient reflected light is guided to the imaging means by utilizing the diffusivity of the illumination light to increase the brightness of the portion in the image, while the top surface drool With respect to such a defective part, the straightness of the illumination light can be used to project the part as a dark part in the image. As a result, the inspection accuracy of the top surface can be improved.
上記態様に係る検査装置においては、前記拡散手段として、多数の微小なレンズ要素がランダムに配置されることにより前記光軸を中心とした所定の範囲内で前記平行光束の照明光を拡散させるレンズタイプの拡散板が用いられてもよい。この形態によれば、拡散板を通過した照明光の照度の均一性を確保しつつ、適度な拡散性を照明光に付与することができる。 In the inspection device according to the above aspect, as the diffusion means, a lens that diffuses the illumination light of the parallel luminous flux within a predetermined range centered on the optical axis by randomly arranging a large number of minute lens elements. A type of diffuser may be used. According to this form, it is possible to impart appropriate diffusivity to the illumination light while ensuring the uniformity of the illuminance of the illumination light that has passed through the diffuser plate.
さらに、前記レンズタイプの拡散板は、前記光軸の回りに対称な照度分布が得られるように前記平行光束の照明光を拡散させるものでもよい。これによれば、照明光の周方向における照度のばらつきを抑えて、天面をその全周に亘ってより均一な照度で照明することができる。 Further, the lens type diffuser may diffuse the illumination light of the parallel luminous flux so that a symmetrical illuminance distribution can be obtained around the optical axis. According to this, it is possible to suppress the variation of the illuminance in the circumferential direction of the illumination light and illuminate the top surface with a more uniform illuminance over the entire circumference thereof.
本発明の一態様に係る口部天面の検査方法は、成形体（２）の口部（３）の天面（３ａ）に対して当該天面と直交する光軸を有する照明光を照射する手順と、照明光が照射された天面を当該天面と直交する方向から撮影する手順とを含み、前記照明する手順では、光源（１０）から射出された平行光束の照明光を、前記光源と前記天面との間に介在する拡散手段（１１）にて拡散させ、前記拡散手段にて拡散された照明光を前記天面に照射するものである。 In the method for inspecting the top surface of the mouth according to one aspect of the present invention, the top surface (3a) of the mouth (3) of the molded body (2) is irradiated with illumination light having an optical axis orthogonal to the top surface. In the procedure for illuminating, the procedure for photographing the top surface irradiated with the illumination light from a direction orthogonal to the top surface is included, and in the procedure for illuminating, the illumination light of the parallel light beam emitted from the light source (10) is used. It is diffused by the diffusing means (11) interposed between the light source and the top surface, and the illumination light diffused by the diffusing means is applied to the top surface.
上記態様の検査方法によれば、光源から平行光束の照明光を射出させ、その照明光を拡散手段により拡散させているので、照明光の拡散範囲を適切に設定することにより、照明光に適度の直進性と拡散性とを与えつつ口部の天面に均一な照明光を導くことができる。それにより、上記態様の検査装置と同様に、口部の天面における形状誤差部分に関しては、当該部分の画像中における明度を増加させ、その一方、天面だれのような不良箇所に関しては、その部分を画像中に暗部として映し出すことにより、天面の検査精度を向上させることができる。 According to the inspection method of the above aspect, the illumination light of the parallel light beam is emitted from the light source, and the illumination light is diffused by the diffusing means. Therefore, by appropriately setting the diffusion range of the illumination light, the illumination light is appropriately used. It is possible to guide uniform illumination light to the top surface of the mouth while giving straightness and diffusivity. As a result, as in the case of the inspection device of the above aspect, the brightness of the shape error portion on the top surface of the mouth portion is increased in the image of the portion, while the defective portion such as the top surface drool is increased. By projecting the portion as a dark portion in the image, the inspection accuracy of the top surface can be improved.
なお、以上の説明では本発明の理解を容易にするために添付図面の参照符号を括弧書きにて付記したが、それにより本発明が図示の形態に限定されるものではない。 In the above description, reference numerals of the accompanying drawings are added in parentheses to facilitate understanding of the present invention, but the present invention is not limited to the illustrated form.
以上に説明したように、本発明の検査装置及び検査方法においては、照明手段の光源から一旦平行光束の照明光を射出させ、その照明光を拡散手段により拡散させているので、適度の直進性と拡散性とが与えられた均一な照明光を天面に導き、それにより天面の検査精度を向上させることができる。 As described above, in the inspection device and the inspection method of the present invention, the illumination light of the parallel luminous flux is once emitted from the light source of the illumination means, and the illumination light is diffused by the diffusion means, so that the linearity is appropriate. It is possible to guide the uniform illumination light given the diffusivity to the top surface, thereby improving the inspection accuracy of the top surface.
以下、図１〜図３を参照して本発明の一形態に係る口部天面の検査装置を説明する。図１に示すように、検査装置１は、成形体の一例としてのプリフォーム２における口部３の天面３ａを検査するためのものである。プリフォーム２はＰＥＴボトル等の樹脂製ボトルをブロー成形するための原型となるべきものであるが、口部３はねじ部やサポートリング等が成形されてボトルと同形同大である。プリフォーム２の天面３ａは、中心線ＣＬと直交するように形成される。検査装置１は、その天面３ａの外周に上述した天面だれが生じているか否かを検査する。 Hereinafter, the inspection device for the top surface of the mouth according to one embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the inspection device 1 is for inspecting the top surface 3a of the mouth portion 3 in the preform 2 as an example of the molded body. The preform 2 should be a prototype for blow molding a resin bottle such as a PET bottle, but the mouth portion 3 has a screw portion, a support ring and the like formed and has the same shape and size as the bottle. The top surface 3a of the preform 2 is formed so as to be orthogonal to the center line CL. The inspection device 1 inspects whether or not the above-mentioned top surface drool is generated on the outer periphery of the top surface 3a.
検査装置１は、撮影手段としてのカメラ５と、照明手段としての照明装置６とを備えている。カメラ５は、その撮影光軸ＡＸを口部３の中心線ＣＬと一致させた状態で天面３ａの真上に配置されている。したがって、カメラ５は天面３ａをこれと直交する方向から撮影する。カメラ５は、ＣＣＤやＣＭＯＳのような固体撮像素子を含み、その固体撮像素子を利用して天面３ａの光学的画像を画像信号に変換して出力する。 The inspection device 1 includes a camera 5 as a photographing means and a lighting device 6 as a lighting means. The camera 5 is arranged directly above the top surface 3a in a state where the photographing optical axis AX is aligned with the center line CL of the mouth portion 3. Therefore, the camera 5 photographs the top surface 3a from a direction orthogonal to the top surface 3a. The camera 5 includes a solid-state image sensor such as a CCD or CMOS, and uses the solid-state image sensor to convert an optical image of the top surface 3a into an image signal and output it.
照明装置６は、照明光を射出する光源１０と、その光源１０と天面３ａとの間に介在して光源１０からの照明光を拡散させる拡散手段としての拡散板１１と、拡散板１１を通過した照明光を、その光軸がカメラ５の撮影光軸ＡＸ及びプリフォーム２の口部３の中心線ＣＬと一致するようにして天面３ａ側に反射させるハーフミラー１２とを備えている。カメラ５には、天面３ａ上で反射してハーフミラー１２を透過した光束が撮影光束として導かれる。 The lighting device 6 comprises a light source 10 that emits illumination light, a diffuser plate 11 as a diffusion means that diffuses the illumination light from the light source 10 by interposing between the light source 10 and the top surface 3a, and a diffuser plate 11. It is provided with a half mirror 12 that reflects the passing illumination light toward the top surface 3a so that the optical axis coincides with the photographing optical axis AX of the camera 5 and the center line CL of the mouth portion 3 of the preform 2. .. A light beam reflected on the top surface 3a and transmitted through the half mirror 12 is guided to the camera 5 as a shooting light flux.
照明装置６の光源１０には、平行光束の照明光を射出するコリメートライトが用いられている。光源１０から射出される照明光の光束は断面円形である。照明光の波長域は適宜でよいが、一例として可視域の白色光である。光源１０は、その光軸がプリフォーム２の中心線ＣＬと直交する方向を向くように配置されている。拡散板１１は、光源１０から射出された平行光束の照明光を、その光軸を中心とした所定の範囲内で拡散させる。ハーフミラー１２は、拡散板１１を通過した照明光を天面３ａに向けて９０°の角度で反射させるように配置されている。ハーフミラー１２の反射率と透過率との比率は一例として１対１である。 A collimating light that emits illumination light having a parallel luminous flux is used as the light source 10 of the illumination device 6. The luminous flux of the illumination light emitted from the light source 10 has a circular cross section. The wavelength range of the illumination light may be appropriate, but one example is white light in the visible range. The light source 10 is arranged so that its optical axis faces a direction orthogonal to the center line CL of the preform 2. The diffuser plate 11 diffuses the illumination light of the parallel luminous flux emitted from the light source 10 within a predetermined range centered on the optical axis thereof. The half mirror 12 is arranged so as to reflect the illumination light that has passed through the diffuser plate 11 toward the top surface 3a at an angle of 90 °. The ratio of the reflectance to the transmittance of the half mirror 12 is 1: 1 as an example.
拡散板１１には、多数の微小なレンズ要素がランダムに配置されることにより、入射光をその光軸を中心とした所定の範囲内で拡散させる構造の拡散板が用いられている。以下、図２及び図３を参照して拡散板１１の拡散特性を説明する。図２は、光源１０から射出された照明光の平行光束ＬＦが拡散板１１にて拡散される様子を示している。拡散板１１を透過した照明光を光軸ＬＸと直交する仮想平面Ｐ上に投影したと仮定した場合、その仮想平面Ｐに対して照明光は光軸ＬＸを中心とした円ＣＲの範囲内に照射される。つまり、拡散板１１は、照明光の光束ＬＦを断面円形に整形しつつ拡散させるように構成されている。このような拡散板１１は、レンズタイプの拡散板として市場に提供されており、本形態の検査装置１でもそのような市販の拡散板を拡散板１１として適宜に使用することができる。例えば、株式会社オプティカルソリューションズがレンズ拡散板の名称で販売するレンズ拡散板を拡散板１１として利用することができる。 As the diffuser plate 11, a diffuser plate having a structure in which a large number of minute lens elements are randomly arranged to diffuse incident light within a predetermined range centered on the optical axis is used. Hereinafter, the diffusion characteristics of the diffusion plate 11 will be described with reference to FIGS. 2 and 3. FIG. 2 shows how the parallel luminous flux LF of the illumination light emitted from the light source 10 is diffused by the diffuser plate 11. Assuming that the illumination light transmitted through the diffuser plate 11 is projected on the virtual plane P orthogonal to the optical axis LX, the illumination light is within the range of the circle CR centered on the optical axis LX with respect to the virtual plane P. Be irradiated. That is, the diffuser plate 11 is configured to diffuse the luminous flux LF of the illumination light while shaping it into a circular cross section. Such a diffuser plate 11 is provided on the market as a lens type diffuser plate, and such a commercially available diffuser plate can be appropriately used as the diffuser plate 11 in the inspection device 1 of the present embodiment. For example, the lens diffuser sold by Optical Solutions Co., Ltd. under the name of the lens diffuser can be used as the diffuser 11.
図３は、拡散板１１によって拡散された照明光の照度分布を示している。例えば、図２の仮想平面Ｐを照射面とし、その照射面Ｐと光軸ＬＸとの交点上の照度を１．０として照度を横軸に、拡散板１１上における光軸ＬＸの位置と照射面Ｐ上の任意の点とを結ぶ線分が光軸ＬＸとなす角度αを縦軸に取れば、照明光の照度は光軸ＬＸ上で最大で、角度αが増加するにつれて低下する。さらに、その照度分布は光軸ＬＸに関して対称である。照度が半分、すなわち横軸上で０．５まで低下したときの角度αｘを２倍した値が拡散板１１の拡散角θ（＝２αｘ）であり、拡散板１１の拡散範囲は、その拡散角θにて特定することができる。検査装置１において、照射面Ｐに照射される照明光の外形輪郭は円形ＣＲであり、拡散角θは光軸ＬＸの回りに一定である。したがって、拡散板１１を通過した照明光は光軸ＬＸの回りに対称な照度分布を有している。つまり、拡散板１１を通過した照明光は、光軸ＬＸ上で最大照度を示し、光軸ＬＸから離れるに従って照度が漸次減少する照度分布を有し、かつその照度の変化は光軸ＬＸの回りに対称である。それにより、天面３ａを全周に亘って均一な照度で照明することができる。 FIG. 3 shows the illuminance distribution of the illumination light diffused by the diffuser plate 11. For example, the virtual plane P in FIG. 2 is the irradiation surface, the illuminance on the intersection of the irradiation surface P and the optical axis LX is 1.0, the illuminance is the horizontal axis, and the position and irradiation of the optical axis LX on the diffuser plate 11. If the vertical axis is the angle α formed by the line connecting an arbitrary point on the surface P with the optical axis LX, the illuminance of the illumination light is maximum on the optical axis LX and decreases as the angle α increases. Furthermore, its illuminance distribution is symmetric with respect to the optical axis LX. The value obtained by doubling the angle αx when the illuminance is reduced to half, that is, to 0.5 on the horizontal axis is the diffusion angle θ (= 2αx) of the diffusion plate 11, and the diffusion range of the diffusion plate 11 is the diffusion angle. It can be specified by θ. In the inspection device 1, the outer contour of the illumination light applied to the irradiation surface P is a circular CR, and the diffusion angle θ is constant around the optical axis LX. Therefore, the illumination light that has passed through the diffuser plate 11 has a symmetrical illuminance distribution around the optical axis LX. That is, the illumination light passing through the diffuser plate 11 shows the maximum illuminance on the optical axis LX, has an illuminance distribution in which the illuminance gradually decreases as the distance from the optical axis LX increases, and the change in the illuminance is around the optical axis LX. Is symmetric. As a result, the top surface 3a can be illuminated with a uniform illuminance over the entire circumference.
図１の検査装置１において、拡散板１１の拡散角θは、拡散板１１から天面３ａまでの光路長等に応じて適宜に設定されてよいが、天面３ａの全面にて照明光の照度が十分に均一となるように拡散角θを選択することが望ましい。 In the inspection device 1 of FIG. 1, the diffusion angle θ of the diffusion plate 11 may be appropriately set according to the optical path length from the diffusion plate 11 to the top surface 3a, but the entire surface of the top surface 3a is covered with illumination light. It is desirable to select the diffusion angle θ so that the illuminance is sufficiently uniform.
図１に戻って、検査装置１にはさらに処理ユニット７が設けられている。検査装置１における天面の検査では、照明装置６からの照明光が天面３ａに照射され（照射する手順）、その照明光が照射された天面３ａの画像がカメラ５にて撮影される（撮影する手順）。処理ユニット７は、カメラ５から画像信号を受け取り、その画像信号によって表現される電子的な画像に対して所定の画像処理を施した上で、天面３ａにおける天面だれの有無を判別する。なお、ここでは天面だれの有無を検査するものとしたが、検査装置１による検査は、天面だれに代えて、又は加えて、他の不良箇所の有無を判別するようにして実施されてもよい。 Returning to FIG. 1, the inspection device 1 is further provided with a processing unit 7. In the inspection of the top surface of the inspection device 1, the illumination light from the illumination device 6 is irradiated to the top surface 3a (procedure of irradiation), and the image of the top surface 3a irradiated with the illumination light is taken by the camera 5. (Procedure for shooting). The processing unit 7 receives an image signal from the camera 5, performs predetermined image processing on the electronic image represented by the image signal, and then determines the presence or absence of a top surface slump on the top surface 3a. In addition, although the presence or absence of the top surface is inspected here, the inspection by the inspection device 1 is carried out in place of or in addition to the top surface of the surface so as to determine the presence or absence of other defective parts. May be good.
以上の検査装置１によれば、光源１０から平行光束の照明光を射出させた後、これを拡散板１１により所定範囲内に拡散させてから天面３ａに導くようにしたので、照明光の拡散角θを適切に設定することにより、照明光に適度の直進性と拡散性とを与えつつ口部３の天面３ａに均一な照明光を導くことができる。したがって、口部３の天面３ａに許容範囲内の形状誤差が存在していても、照明光の拡散性を利用してその部分からカメラ５に十分な反射光を導いて当該部分の画像中における明度を増加させることができる。一方、天面だれのような不良箇所では、照明光の直進性を利用してその部分からの反射光に乱れを生じさせ、それにより不良箇所を画像中に暗部として映し出すことができる。これにより、天面の検査精度を向上させることができる。 According to the above inspection device 1, after emitting the illumination light of the parallel luminous flux from the light source 10, the diffuser plate 11 diffuses the illumination light within a predetermined range and then guides the illumination light to the top surface 3a. By appropriately setting the diffusion angle θ, it is possible to guide the illumination light uniformly to the top surface 3a of the mouth portion 3 while giving the illumination light appropriate straightness and diffusivity. Therefore, even if there is a shape error within the allowable range on the top surface 3a of the mouth portion 3, sufficient reflected light is guided from that portion to the camera 5 by utilizing the diffusivity of the illumination light in the image of the portion. It is possible to increase the brightness in. On the other hand, in a defective portion such as a top surface drool, the straightness of the illumination light is used to cause disturbance in the reflected light from that portion, whereby the defective portion can be projected as a dark portion in the image. As a result, the inspection accuracy of the top surface can be improved.
本発明は上述した形態に限定されることなく、種々の変更又は変形が施された形態にて実施されてよい。例えば、図１ではハーフミラー１２にて照明光を反射させて天面３ａに導き、ハーフミラー１２を透過した光束をカメラ５に入射させているが、ハーフミラー１２にて反射した光束をカメラ５に入射させ、光源１０及び拡散板１１を天面３ａの真上に配置してハーフミラー１２を透過した照明光を天面３ａに導いてもよい。検査対象の成形体はプリフォームの天面に限定されず、成形済のボトルの天面が検査対象とされてもよい。その他にも各種の成形体の口部天面が検査対象とされてよい。 The present invention is not limited to the above-mentioned form, and may be carried out in a form in which various modifications or modifications have been made. For example, in FIG. 1, the half mirror 12 reflects the illumination light and guides it to the top surface 3a, and the light source transmitted through the half mirror 12 is incident on the camera 5, but the light source reflected by the half mirror 12 is reflected by the camera 5. The light source 10 and the diffuser plate 11 may be arranged directly above the top surface 3a to guide the illumination light transmitted through the half mirror 12 to the top surface 3a. The molded product to be inspected is not limited to the top surface of the preform, and the top surface of the molded bottle may be the inspection target. In addition, the top surface of the mouth of various molded products may be subject to inspection.
上述した検査装置１を用いてプリフォーム２の天面３ａを撮影した画像の一例を図４に示し、その比較例として、図１の検査装置１から拡散板１１を省略した構成にて天面３ａを撮影した画像の一例を図５に示す。ただし、撮影に使用したプリフォームは天面だれ等の欠陥がない良品である。図５の画像では、丸印で囲んだ箇所に暗部が生じている。その暗部は、口部の外周に形成されるねじ部の開始位置である。このような暗部が生じると、プリフォームが良品であるにも関わらず、天面だれが生じた不良品として誤って判定されるおそれがある。これに対して、同一のプリーフォームを本発明に係る検査装置で撮影した図４の画像では、丸印で囲んだ箇所も他の部分と同等の明部として映し出されている。したがって、良品を不良品として誤って判定するおそれを排除することが可能である。 FIG. 4 shows an example of an image obtained by photographing the top surface 3a of the preform 2 using the above-mentioned inspection device 1, and as a comparative example thereof, the top surface is configured by omitting the diffusion plate 11 from the inspection device 1 of FIG. FIG. 5 shows an example of an image obtained by photographing 3a. However, the preform used for shooting is a good product with no defects such as dripping on the top surface. In the image of FIG. 5, a dark portion is generated at a portion surrounded by a circle. The dark portion is the starting position of the screw portion formed on the outer circumference of the mouth portion. If such a dark part occurs, even though the preform is a good product, it may be erroneously determined as a defective product with a top surface sagging. On the other hand, in the image of FIG. 4 in which the same preform is taken by the inspection device according to the present invention, the portion circled is also projected as a bright portion equivalent to other portions. Therefore, it is possible to eliminate the possibility of erroneously determining a non-defective product as a defective product.
１ 検査装置
２ プリフォーム（成形体）
３ 口部
３ａ 天面
５ カメラ（撮影手段）
６ 照明装置（照明手段）
１０ 光源
１１ 拡散板（拡散手段）
θ 拡散角
1 Inspection device 2 Preform (molded body)
3 Mouth 3a Top 5 Camera (shooting means)
6 Lighting device (lighting means)
10 Light source 11 Diffusing plate (diffusing means)
θ diffusion angle
Claims (4)
前記天面を当該天面と直交する方向から撮影するように設けられた撮影手段と、前記天面に対して当該天面と直交する光軸を有する照明光を照射するように設けられた照明手段とを備え、
前記照明手段は、平行光束の照明光を射出する光源と、前記光源と前記天面との間に介在し、前記光源からの照明光をその照明範囲が前記光軸から半径方向外側に広がるように拡散させる拡散手段とを有し、前記拡散手段にて拡散された照明光が前記天面に照射され、かつ前記拡散手段にて拡散された照明光以外の照明光は前記天面に照射されないように構成されている口部天面の検査装置。 It is an inspection device that inspects the presence or absence of defective parts including top surface drips on the top surface of the mouth of the molded product.
An imaging means provided to photograph the top surface from a direction orthogonal to the top surface, and illumination provided to irradiate the top surface with illumination light having an optical axis orthogonal to the top surface. With means
The illumination means is interposed between a light source that emits illumination light of a parallel light beam and the light source and the top surface, so that the illumination range of the illumination light from the light source extends outward in the radial direction from the optical axis. The top surface is irradiated with the illumination light diffused by the diffusion means, and the illumination light other than the illumination light diffused by the diffusion means is not irradiated on the top surface. An inspection device for the top surface of the mouth that is configured as such.
前記天面に対して当該天面と直交する光軸を有する照明光を照射する手順と、照明光が照射された天面を当該天面と直交する方向から撮影する手順とを含み、
前記照射する手順では、光源から射出された平行光束の照明光を、前記光源と前記天面との間に介在する拡散手段にてその照明範囲が前記光軸から半径方向外側に広がるように拡散させ、前記拡散手段にて拡散された照明光を前記天面に照射し、かつ前記拡散手段にて拡散された照明光以外の照明光は前記天面に照射しない口部天面の検査方法。 It is an inspection method that inspects the presence or absence of defective parts including top surface drips on the top surface of the mouth of the molded product.
The procedure includes a procedure of irradiating the top surface with illumination light having an optical axis orthogonal to the top surface, and a procedure of photographing the top surface irradiated with the illumination light from a direction orthogonal to the top surface.
In the irradiation procedure, the illumination light of the parallel light beam emitted from the light source is diffused by a diffusing means interposed between the light source and the top surface so that the illumination range extends outward in the radial direction from the optical axis. A method for inspecting the top surface of the mouth, which irradiates the top surface with the illumination light diffused by the diffusion means, and does not irradiate the top surface with illumination light other than the illumination light diffused by the diffusion means.
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| FR2846424B1 (en) * | 2002-10-25 | 2006-02-03 | Bsn Glasspack | METHOD AND LIGHTING DEVICE FOR DETECTING DEFECT AND / OR LACK OF MATTER ON THE RING OF A TRANSPARENT OR TRANSLUCENT CONTAINER |
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