Container inspection device and blister packaging machine

Abstract

Provided are a container inspection device and the like that can improve inspection efficiency, suppress differences in inspection accuracy, and determine the presence or absence of defective portions in a side wall portion with high accuracy. A container inspection device (21) is provided with: optical path conversion sheets (52a-52d) capable of converting the optical path of light reflected or transmitted at a circumferentially continuous side wall region in a bag side wall part; an image forming optical system (56) for forming an image of the light, the optical path of which has been converted by the optical path conversion sheets (52a-52d), onto an imaging element (54c); and an image processing device 55 capable of determining whether the side wall portion is qualified on the basis of image data obtained by the light imaged on the imaging element. The plurality of optical path conversion sheets 52a-52d respectively correspond to different side wall regions, and convert the optical path of the light reflected or transmitted at the corresponding side wall region into an optical path along the optical axis direction of the imaging optical system 56. The entire outer periphery of the side wall part is covered by a plurality of side wall regions corresponding to the optical path conversion sheets (52a-52d).

Description

Technical Field

[0001] The present invention relates to a container inspection device for inspecting a side wall portion of a container, and a blister packaging machine having the container inspection device. Background Art

[0002] In the past, containers for storing prescribed contents (such as pharmaceuticals, foods, etc.) have been widely used. The containers referred to here include not only containers that are not connected to other containers, but also containers that are connected to other containers. For example, in a container film having a plurality of bag portions for storing tablets or the like and a flange portion between the open-side end edges connecting these bag portions, the bag portions can be regarded as corresponding to containers.

[0003] However, if a container has a scar (such as a crack) or a hole (a relatively small hole called a pinhole or a relatively large hole, etc.), the sealing performance of the contents may be affected. In addition, if foreign matter or dirt adheres to the container, the hygiene and safety of the contents may be impaired. Therefore, container inspection devices are widely used to inspect containers.

[0004] As is well known, as a container inspection device capable of inspecting the side wall portion of a container, the side wall portion is more difficult to inspect than the bottom wall portion of the container. As such a container inspection device, there is provided: a wide-angle lens and an image sensor disposed directly above the opening of the container (paper cup), and the image sensor receives reflected light from the side wall portion of the container through the wide-angle lens (for example, refer to Patent Document 1, etc.).

[0005] Further, as a container inspection device capable of inspecting the side wall portion of a container, there has been proposed a device having: a pair of cameras configured to place a container film therebetween when viewed from above and photograph the side wall portion of the container (bag portion) obliquely from above; and a determination mechanism that determines whether there is a hole (pinhole) in the container based on the image data obtained by these cameras (see Patent Document 2, etc.). In this container inspection device, the side wall portion facing the camera on one side (referred to as the "left side wall portion") is photographed by one of the cameras, and the side wall portion facing the camera on the other side (referred to as the "right side wall portion") is photographed by the other camera.

[0006] In addition, as a container inspection device capable of inspecting the side wall portion of a container, there has been proposed a scheme in which there is provided a camera that photographs a container (bag portion) through a prism lens (light collecting lens), and determines the presence or absence of a hole in the side wall portion of the container based on the image data obtained by the camera (for example, refer to Patent Document 3, etc.).

[0007] [Prior Art Documents]

[0008] [Patent Documents]

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 9-243574

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 2021-128033

[0011] Patent Document 3: Japanese Patent Application Laid-Open No. 2015-94694 Summary of the Invention

[0012] [Problems to be solved by the invention]

[0013] However, in the container inspection device related to Patent Document 1, a device having a single wide-angle lens and an image sensor (i.e., a single camera) can only image a single container. Therefore, it is not possible to inspect multiple containers at once, resulting in low inspection efficiency.

[0014] In contrast, the container inspection device described in Patent Document 2 uses a pair of cameras to simultaneously image multiple containers, enabling simultaneous inspection of these containers. However, in this container inspection device, the dimensions of the left and right side walls shown in the image data vary depending on the container's position along the width of the container film. For example, the left or right side wall of a container located farther from the camera, at the end edge of the container film in the width direction, will appear to have a relatively small area in the image data. Consequently, inspection accuracy may vary depending on the container's position.

[0015] Furthermore, in the container inspection device related to Patent Document 3, the image data obtained by the prism sheet easily becomes blurred. Therefore, even if foreign matter, scratches, dirt, etc. are attached to the sidewall, it is difficult to accurately determine the presence of the foreign matter, scratches, dirt, etc. from the blurred image data. Furthermore, while the presence of a hole (highly luminous portion) can be determined based on the image data, the location of the hole is difficult to determine based on the image data. In other words, the container inspection device related to Patent Document 3 may lead to the following problems: The accuracy of determining the presence of an unqualified portion (foreign matter, scratches, dirt) may be reduced; even if the presence of an unqualified portion (hole) can be determined, its location may not be accurately specified.

[0016] The present invention is proposed in view of the above situation, and its purpose is to provide a container inspection device, etc., which can improve inspection efficiency and suppress differences in inspection accuracy, while being able to determine with high precision the presence or absence of unqualified parts in the side wall portion, and can more accurately specify the position of the unqualified part.

[0017] [Solutions to solve the problem]

[0018] Hereinafter, each solution suitable for solving the above object will be described item by item. Also, if necessary, the specific effects of the corresponding solutions will be noted.

[0019] Solution 1: A container inspection device for inspecting the side wall portions of a plurality of containers transported in a side-by-side state in multiple columns, characterized in that the container inspection device includes:

[0020] An irradiation mechanism that irradiates a predetermined light onto the plurality of containers;

[0021] An imaging element that is used to image the light irradiated from the irradiation mechanism;

[0022] An optical path conversion sheet that can convert the optical path of the light irradiated from the irradiation mechanism and reflected or transmitted at a side wall region that is continuous in the circumferential direction in the side wall portion;

[0023] An imaging optical system that images the light whose optical path has been converted by the optical path conversion sheet onto the imaging element; and

[0024] A determination mechanism that can determine whether the side wall portion is qualified based on the image data obtained from the light imaged on the imaging element;

[0025] Wherein, the optical path conversion sheet is configured such that when viewed from the imaging element side, it straddles multiple columns of the container, and a plurality of the optical path conversion sheets are provided along the transportation direction of the container;

[0026] The plurality of optical path conversion sheets respectively correspond to different ones of the side wall regions, and are configured to convert the optical path of the light reflected or transmitted at the corresponding side wall region into an optical path along the optical axis direction of the imaging optical system;

[0027] It is further configured such that the entire outer circumference of the side wall portion is covered by the plurality of side wall regions corresponding to the respective optical path conversion sheets.

[0028] According to Solution 1 above, the optical path conversion sheet is configured to straddle multiple columns of the container when viewed from the imaging element side. Moreover, through the optical path conversion sheet, the optical paths of the light reflected or transmitted at multiple containers are converted, and the light whose optical path has been converted is imaged by the imaging optical system and captured by the imaging element. Therefore, multiple containers can be inspected simultaneously, thereby improving the inspection efficiency.

[0029] Also, according to Solution 1 above, the entire outer circumference of the side wall portion of the container is covered by the plurality of side wall regions corresponding to the respective optical path conversion sheets. Therefore, the entire outer circumference of the side wall portion can be inspected.

[0030] Furthermore, according to the above-described solution 1, the multiple optical path conversion sheets correspond to different sidewall regions, converting the optical paths of light reflected or transmitted from the corresponding sidewall regions into optical paths along the optical axis of the imaging optical system. Furthermore, the imaging optical system images the light, after optical path conversion by the optical path conversion sheets, onto an imaging element, thereby forming an imaging element. Therefore, compared to conventional techniques that image the container from an oblique angle, it is possible to more reliably prevent the size (area) of the sidewall region in the image data from varying with the container's position. This can suppress variations in inspection accuracy that occur with varying container positions. Furthermore, the influence of light reflected from other parts of the container on the portion of the image data related to the sidewall region can be suppressed, allowing the image data to more clearly display the portion related to the sidewall region and the outline and shape of defective portions (e.g., dirt, foreign matter, holes, etc.) located in the sidewall region. As a result, the presence of defective portions in the sidewall can be determined with high precision, and the location of the defective portions can be more accurately identified.

[0031] Solution 2: The container inspection device according to Solution 1, characterized in that the imaging optical system is configured to form an object-side telecentric optical system and has an aperture capable of adjusting the light formed into an image on the imaging element.

[0032] According to the second solution, the light imaged on the image sensor can be adjusted by the aperture, among the light converted by the optical path conversion plate. Therefore, appropriate image data can be obtained more reliably and easily during inspection.

[0033] Solution 3: The container inspection device according to Solution 1 is characterized in that the imaging optical system has an object side lens, which is used to focus the light after the optical path conversion by the optical path conversion plate.

[0034] The object side lens is a Fresnel lens.

[0035] According to the third embodiment, since the object-side lens is a Fresnel lens, the object-side lens can be made relatively thin, thereby suppressing the size of the device and increasing the degree of freedom in device installation.

[0036] Solution 4: The container inspection device according to Solution 1 is characterized in that a plurality of parallel and parallel protrusions are formed on the surface of the optical path conversion sheet.

[0037] The protrusion has:

[0038] a substantially vertical plane, wherein the angle formed by the substantially vertical plane with respect to the flat back surface of the optical path conversion sheet in a cross section perpendicular to the extending direction of the protrusion is not less than 80° and not more than 95°; and

[0039] An inclined surface, wherein an angle formed by the inclined surface with respect to the back surface in the cross section is not less than 10° and not more than 50°.

[0040] According to the fourth solution, each optical path conversion sheet can more reliably convert the optical path of light reflected from or transmitted through the corresponding sidewall region to a path along the optical axis of the imaging optical system, while more effectively preventing the optical path of light reflected from or transmitted through other parts of the container from being converted along the optical axis. This allows the outline and shape of the portion associated with the sidewall region and the defective portion to be more reliably and clearly displayed in the image data. As a result, the presence of defective portions in the sidewall can be determined with greater precision, and the location of the defective portion can be more accurately identified.

[0041] Solution 5: The container inspection device according to Solution 1 is characterized in that the irradiation mechanism is arranged between the plurality of optical path conversion plates.

[0042] According to the fifth aspect, the irradiation mechanism can be accommodated between the optical path conversion sheets, thereby achieving miniaturization of the device.

[0043] Solution 6: The container inspection device according to Solution 1, characterized in that the plurality of containers are connected by flange portions, and the flange portions extend outward from the end edges of the side walls.

[0044] The imaging optical system is configured to form an image of light passing through the plurality of optical path conversion sheets and reflected or transmitted by the flange portion onto the imaging element.

[0045] The determination unit can determine whether the flange portion is acceptable based on the image data.

[0046] According to the sixth embodiment, not only the sidewalls of the containers can be inspected, but also the flanges connecting the containers can be inspected. This improves inspection efficiency compared to inspecting the containers and flanges separately.

[0047] Solution 7: The container inspection device according to Solution 1 is characterized in that the imaging optical system is configured to image the light that passes between the plurality of optical path conversion sheets and is reflected or transmitted by the bottom wall of the container onto the imaging element.

[0048] The determination unit can determine whether the bottom wall portion is acceptable based on the image data.

[0049] According to the seventh embodiment, not only the side walls of the container but also the bottom wall of the container can be inspected, thereby further improving the efficiency of container inspection.

[0050] Solution 8: A blister packaging machine for manufacturing a blister sheet, the blister sheet being configured to cover a container film with a cover film in a manner of closing a bag portion formed in the container film while the content is stored in the bag portion formed in the container film.

[0051] The blister packaging machine includes:

[0052] A bag portion forming mechanism that forms the bag portion in the strip-shaped container film;

[0053] A conveying mechanism that conveys the container film and conveys the bag portions in a state of being arranged side by side in multiple columns;

[0054] A filling mechanism that fills the content into the bag portion; and

[0055] The container inspection device according to Solution 1;

[0056] The container inspection device is configured to be disposed between the bag portion forming mechanism and the filling mechanism along the conveying path of the container film, and determine whether the side wall portion related to the bag portion as the container is qualified.

[0057] According to the above Solution 8, the same effects as those of the above Solution 1 can be achieved.

[0058] Furthermore, the technical features related to the above solutions can be combined as appropriate. For example, the technical features related to the above Solution 3 can be combined with the technical features related to the above Solution 2. Also, for example, the technical features of at least one of the above Solutions 2 to 7 can be combined with the technical features related to the above Solution 8. Description of the Drawings

[0059] Figure 1 Is a perspective view showing a PTP sheet.

[0060] Figure 2 Is a partially enlarged cross-sectional view of a PTP sheet.

[0061] Figure 3 Is a perspective view showing a PTP film.

[0062] Figure 4 Is a schematic diagram showing the general structure of a PTP packaging machine.

[0063] Figure 5 Is a block diagram showing the general structure of a container inspection device.

[0064] Figure 6 Is a perspective view of a container inspection device.

[0065] Figure 7 Is alongFigure 6 Schematic cross-sectional view of the J-J line.

[0066] Figure 8 Is along Figure 6 Schematic cross-sectional view of the K-K line.

[0067] Figure 9 Planar schematic diagram of the container film and the optical path conversion sheet.

[0068] Figure 10 Stereoscopic schematic diagram of the optical path conversion sheet, used to show the extending direction of the rib portion.

[0069] Figure 11 Enlarged planar schematic diagram for explaining one side wall region.

[0070] Figure 12 Enlarged planar schematic diagram for explaining one side wall region.

[0071] Figure 13 Enlarged cross-sectional schematic diagram for explaining the optical path conversion sheet.

[0072] Figure 14 Cross-sectional schematic diagram of the container inspection device when photographing the bag portion located at the first position.

[0073] Figure 15 Schematic diagram showing a part of the image data obtained by photographing the bag portion located at the first position.

[0074] Figure 16 Cross-sectional schematic diagram of the container inspection device when photographing the bag portion located at the second position in the case where the cross-section is parallel to the conveying direction of the bag portion.

[0075] Figure 17 Cross-sectional schematic diagram of the container inspection device when photographing the bag portion located at the second position in the case where the cross-section is perpendicular to the conveying direction of the bag portion.

[0076] Figure 18 Schematic diagram showing a part of the image data obtained by photographing the bag portion located at the second position.

[0077] Figure 19 Cross-sectional schematic diagram of the container inspection device when photographing the bag portion located at the third position.

[0078] Figure 20 Schematic diagram showing a part of the image data obtained by photographing the bag portion located at the third position.

[0079] Figure 21 Cross-sectional schematic diagram of the container inspection device when photographing the bag portion located at the fourth position in the case where the cross-section is parallel to the conveying direction of the bag portion.

[0080] Figure 22 Schematic cross-sectional view of the container inspection device when photographing the pouch portion located at the fourth position with the cross-section perpendicular to the conveying direction of the pouch portion.

[0081] Figure 23 Schematic view showing a part of the image data obtained by photographing the pouch portion located at the fourth position.

[0082] Figure 24 Schematic cross-sectional view showing the lighting device in other embodiments.

[0083] Figure 25 Schematic perspective view showing the optical path conversion sheet in other embodiments.

[0084] Figure 26 Schematic cross-sectional view of the container inspection device that can photograph the flange portion between multiple optical path conversion sheets in other embodiments.

[0085] Figure 27 Schematic cross-sectional view of the container inspection device that can photograph the bottom wall portion between multiple optical path conversion sheets in other embodiments.

[0086] Figure 28 Schematic cross-sectional view of the container inspection device arranged on the protruding portion side of the pouch portion in other embodiments.

[0087] Figure 29 Schematic cross-sectional view of the container inspection device with the lighting device arranged between the optical path conversion sheets in other embodiments.

[0088] Figure 30 Schematic cross-sectional view of the container inspection device with the front and back of the optical path conversion sheet changed in other embodiments. Detailed implementation mode

[0089] Hereinafter, an embodiment will be described while referring to the attached Figure One First, the configuration of the PTP sheet as the "blister sheet" will be described.

[0090] As Figure 1 , Figure 2 shown, the PTP sheet 1 has: a container film 3 having a plurality of pouch portions 2; and a cover film 4 mounted on the container film 3 so as to cover the pouch portion 2. In this embodiment, the pouch portion 2 corresponds to the "container".

[0091] The pouch portion 2 is rectangular in plan view and has a flat bottom wall portion 2a and a rectangular tubular side wall portion 2b that is connected to the outermost peripheral portion of the bottom wall portion 2a. The side wall portion 2b has a shape that gradually widens toward the opening of the pouch portion 2.

[0092] The container film 3 is formed of a transparent thermoplastic material such as PP (polypropylene) or PVC (polyvinyl chloride), and has light transmissivity. The container film 3 has a predetermined thickness (for example, 120 μm or more and 300 μm or less).

[0093] Further, the container film 3 has a flat flange portion 3a that extends outward from the edge portion of the side wall portion 2b and connects the plurality of bag portions 2 to each other. The flange portion 3a is a portion to be covered by the cover film 4.

[0094] On the one hand, the cover film 4 is made of an opaque material (such as aluminum foil), and a sealant made of polypropylene resin or the like is provided on the surface of the opaque material.

[0095] The PTP sheet 1 is manufactured by stamping a strip-shaped PTP film 6 (see Figure 3 ) formed by the strip-shaped container film 3 and the strip-shaped cover film 4 into a sheet shape, and is formed to be substantially rectangular in plan view.

[0096] In the PTP sheet 1, a row of bags formed by five bag portions 2 arranged longitudinally is formed in two rows in the lateral direction. That is, a total of 10 bag portions 2 are formed. One tablet 5 as the "content" is respectively stored in each bag portion 2.

[0097] Next, a general configuration of the PTP packaging machine 10 for manufacturing the above-described PTP sheet 1 will be described. In the present embodiment, the PTP packaging machine 10 corresponds to a "blister packaging machine".

[0098] As Figure 4 shown, at the most upstream side of the PTP packaging machine 10, a raw material roll of the strip-shaped container film 3 is wound into a roll shape. The pull-out end side of the container film 3 wound into a roll shape is guided by a guide roller 13. The container film 3 is hung on an intermittent feeding roller 14 on the downstream side of the guide roller 13. The intermittent feeding roller 14 is connected to an intermittently rotating motor and intermittently transports the container film 3.

[0099] Between the guide roller 13 and the intermittent feeding roller 14, a heating device 15 and a bag portion forming device 16 are sequentially arranged along the transport path of the container film 3. Moreover, in a state where the container film 3 is heated by the heating device 15 and the container film 3 becomes relatively soft, a plurality of bag portions 2 are formed at a predetermined position of the container film 3 by the bag portion forming device 16. Also, for convenience, Figure 4 in, the bag portion 2 is represented in a rounded manner. The formation of the bag portion 2 is performed during the gap between the transport operations of the container film 3 by the intermittent feeding roller 14. In the present embodiment, the bag portion forming device 16 constitutes a "bag portion forming mechanism".

[0100] The container film 3 sent out from the intermittent feeding roller 14 is successively hung on the tension roller 18, the guide roller 19, and the film receiving roller 20. The film receiving roller 20 is connected to a motor that rotates at a constant speed, so that the container film 3 can be transported at a continuous and constant speed. When the container film 3 is transported by the film receiving roller 20, the bag portions 2 are transported in multiple rows side by side. In the present embodiment, the film receiving roller 20 constitutes a "transport mechanism".

[0101] The tension roller 18 is formed to stretch the container film 3 toward the tension side by an elastic force, preventing the slack of the container film 3 caused by the difference in the transport actions between the intermittent feeding roller 14 and the film receiving roller 20, and keeping the container film 3 in a tensioned state at all times.

[0102] Between the guide roller 19 and the film receiving roller 20, a container inspection device 21 and a filling device 22 are successively arranged along the transport path of the container film 3. In the present embodiment, the filling device 22 constitutes a "filling mechanism".

[0103] The container inspection device 21 is located between the bag forming device 16 and the filling device 22 along the transport path of the container film 3, and at least inspects the side wall portion 2b of the bag portion 2. The container inspection device 21 will be described in detail below.

[0104] The filling device 22 fills the tablets 5 into each bag portion 2, for example, by opening the gate at regular intervals to allow the tablets 5 to freely fall.

[0105] On the one hand, the raw material roll of the cover film 4 formed in a strip shape is wound into a roll shape on the uppermost upstream side. The pulled-out end of the cover film 4 wound into a roll shape is guided by the guide roller 24 to the heating roller 25.

[0106] The heating roller 25 can be pressed against the film receiving roller 20, so that the container film 3 and the cover film 4 are fed between the two rollers 20, 25. Moreover, the container film 3 and the cover film 4 pass between the two rollers 20, 25 in a heat-pressed state. Thus, the cover film 4 is covered on the container film 3, and the bag portion 2 is sealed by the cover film 4. In this way, the strip-shaped PTP film 6 with the tablets 5 stored in each bag portion 2 is manufactured.

[0107] The PTP film 6 sent out from the film receiving roller 20 is successively hung on the tension roller 27 and the intermittent feeding roller 28. The intermittent feeding roller 28 is connected to an intermittently rotating motor, so as to intermittently transport the PTP film 6. The tension roller 27 is configured to pull the PTP film 6 toward the tension side by an elastic force, preventing the slack of the PTP film 6 caused by the difference in the transport actions between the film receiving roller 20 and the intermittent feeding roller 28, and keeping the PTP film 6 in a tensioned state at all times.

[0108] The PTP film 6 sent out from the intermittent feeding roller 28 is successively hung on the tension roller 31 and the intermittent feeding roller 32. The intermittent feeding roller 32 is connected to an intermittently rotating motor, and thus, the PTP film 6 is transported intermittently. The tension roller 31 is configured to pull the PTP film 6 toward the tension side by an elastic force, preventing the PTP film 6 from slackening between the intermittent feeding rollers 28 and 32.

[0109] Between the intermittent feeding roller 28 and the tension roller 31, a slit forming device 33 and a printing device 34 are successively arranged along the conveying path of the PTP film 6. The slit forming device 33 has a function of forming a cutting slit at a specified position of the PTP film 6. The printing device 34 has a function of imparting a print at a specified position of the PTP film 6. Also, in Figure 1 etc., illustrations of the cutting slit and the print are omitted.

[0110] The PTP film 6 sent out from the intermittent feeding roller 32 is successively hung on the tension roller 35 and the continuous feeding roller 36 on its downstream side. Between the intermittent feeding roller 32 and the tension roller 35, a sheet punching device 37 is arranged along the conveying path of the PTP film 6. The sheet punching device 37 has a function of punching the outer edge of the PTP film 6 into PTP sheet 1 units, that is, cutting the PTP sheet 1 from the PTP film 6.

[0111] The PTP sheet 1 obtained by the sheet punching device 37 is transported by a conveyor belt 39 and temporarily stored in the finished product hopper 40. However, if the container inspection device 21 makes a determination that the object is unqualified, the PTP sheet 1 related to this unqualified determination will not be sent into the finished product hopper 40, but is separately discharged through a non - shown unqualified sheet discharging mechanism.

[0112] The cutting device 41 is arranged on the downstream side of the above - mentioned continuous feeding roller 36. Moreover, the unnecessary film portion 42 that forms the remaining strip - shaped waste portion (scrap portion) after being punched by the sheet punching device 37 is guided by the tension roller 35 and the continuous feeding roller 36 and then guided to the cutting device 41. The cutting device 41 cuts the unnecessary film portion 42 into a specified size. The cut unnecessary film portion 42 (scrap) is stored in the scrap hopper 43 and then separately disposed of.

[0113] Next, the container inspection device 21 will be described. The container inspection device 21 is used to inspect the side wall portions 2b of the bag portions 2 transported in a multi - column arrangement state. As Figures 5 - 8As shown, the container inspection device 21 includes an illumination device 51, optical path conversion sheets 52a, 52b, 52c, 52d, an object-side lens 53, a camera 54, and an image processing device 55. Additionally, the container inspection device 21 may further include: a display mechanism for displaying information stored in the image processing device 55; and an input mechanism (such as a keyboard, etc.) for inputting information to the image processing device 55. In this embodiment, the illumination device 51 constitutes the "irradiation mechanism", and the image processing device 55 constitutes the "determination mechanism". Also, hereinafter, the optical path conversion sheets 52a, 52b, 52c, and 52d are simply referred to as "optical path conversion sheets 52a to 52d".

[0114] The illumination device 51 irradiates a predetermined light (such as ultraviolet light, etc.) onto the plurality of bag portions 2. The illumination device 51 includes: a light source 51a composed of, for example, an LED, etc.; and a light guide plate 51b. The light guide plate 51b is used to guide the light emitted from the light source 51a to the container film 3 (bag portion 2). In this embodiment, the wavelength of the light irradiated from the illumination device 51 onto the container film 3 (bag portion 2) is set to a wavelength that cannot penetrate the container film 3 (bag portion 2) having a normal thickness. Also, as the light guide plate 51b, for example, it can be a light guide plate that is dot-machined on the surface of a thin sheet made of acrylic or the like by printing, ultrasonic waves, etc., and examples include surface-emitting components, etc.

[0115] In addition, the light guide plate 51b emits light toward the container film 3 (bag portion 2) side by the light from the light source 51a. On the other hand, it does not emit light toward the reverse side of the container film 3 (bag portion 2) (the camera 54 side). Also, the light guide plate 51b is configured to be able to transmit the light reflected at the container film 3 (bag portion 2).

[0116] The optical path conversion sheets 52a to 52d are used to convert the optical path of the light reflected from one side wall region AR1, AR2, AR3, AR4 (refer to Figure 11 、 Figure 12 ) that is continuous in the circumferential direction along the side wall portion 2b into an optical path along the optical axis OA direction of the imaging optical system 56 described later (an optical path parallel to the optical axis OA). Also, hereinafter, the one side wall regions AR1, AR2, AR3, and AR4 may be simply referred to as "one side wall regions AR1 to AR4".

[0117] The optical path conversion sheets 52a to 52d are arranged between the illumination device 51 and the container film 3 (bag portion 2) and are provided at regular intervals along the conveyance direction of the container film 3 (bag portion 2). Also, the optical path conversion sheets 52a to 52d (especially the flat back surface 52r (refer to Figure 13)) It is set perpendicular to the optical axis OA and parallel to the conveying direction of the bag portion 2. In addition, the optical path conversion sheets 52a to 52d are arranged such that when viewed from the side of the camera 54 (the image sensor 54c described later), they straddle multiple columns (five columns in this embodiment) of the bag portion 2 (refer to Figure 9 ).

[0118] In addition, the optical path conversion sheets 52a to 52d respectively correspond to different side wall regions AR1 to AR4, and convert the optical path of the light reflected at the corresponding side wall regions AR1 to AR4 into the direction along the optical axis OA. Then, the entire outer periphery of the side wall portion 2b is covered by the corresponding side wall regions AR1 to AR4 of the optical path conversion sheets 52a to 52d.

[0119] In this embodiment, the side wall region AR1 corresponding to the optical path conversion sheet 52a is the region formed by the following part in the side wall portion 2b ( Figure 11 the region with a dotted line): the entire region of the downstream side wall portion 2b1, a part of the left side wall portion 2b2, and a part of the right side wall portion 2b3. The downstream side wall portion 2b1 is the part on the downstream side in the conveying direction of the container film 3 (bag portion 2) in the side wall portion 2b1. Also, the left side wall portion 2b2 is the part on one end side in the width direction of the container film 3 in the side wall portion 2b, and the right side wall portion 2b3 is the part on the other end side in the width direction of the container film 3 in the side wall portion 2b.

[0120] Also, the side wall region AR2 corresponding to the optical path conversion sheet 52b is the region formed by the following part in the side wall portion 2b ( Figure 12 the region with a dotted line): the entire region of the right side wall portion 2b3, a part of the downstream side wall portion 2b1, and a part of the upstream side wall portion 2b4. The upstream side wall portion 2b4 is the part on the upstream side in the conveying direction of the container film 3 (bag portion 2) in the side wall portion 2b1.

[0121] Furthermore, the side wall region AR3 corresponding to the optical path conversion sheet 52c is the region formed by the following part in the side wall portion 2b ( Figure 11 the region with scattered dots): the entire region of the upstream side wall portion 2b4, a part of the left side wall portion 2b2, and a part of the right side wall portion 2b3.

[0122] In addition, the side wall region AR4 corresponding to the optical path conversion sheet 52d is the region formed by the following part in the side wall portion 2b ( Figure 12 the region with scattered dots): the entire region of the left side wall portion 2b2, a part of the downstream side wall portion 2b1, and a part of the upstream side wall portion 2b4.

[0123] Furthermore, a plurality of parallel protrusions 52t are formed on the surfaces of the optical path conversion sheets 52a to 52d disposed on the container film 3 (bag portion 2) side.

[0124] like Figure 13 As shown, the protrusion 52t is substantially in the shape of a right triangle in a cross section perpendicular to the extending direction of the protrusion 52t, and has a substantially vertical surface 52t1 and an inclined surface 52t2. Figure 13 In the figure, hatching is omitted for ease of illustration.

[0125] The substantially vertical surface 52t1 is a surface that extends substantially perpendicular to the flat back surface 52r of the optical path conversion plates 52a to 52d in the cross section, and forms an angle α with respect to the back surface 52r of 80° to 95°.

[0126] The inclined surface 52t2 is a surface that extends in an inclined direction relative to the back surface 52r in the cross section, and forms an angle with the back surface 52r of not less than 10° and not more than 55°. By refracting the light on the inclined surface 52t2, the optical path of the light reflected by the side wall portion 2b and the like is converted to an optical path along the optical axis OA. More specifically, the light L1 ( Figure 13 On the other hand, the optical paths of the light beams L2 and L3 whose incident angles relative to the inclined surface 52t2 are less than or equal to the angle β are converted to paths inclined relative to the optical axis OA, rather than to paths along the optical axis OA.

[0127] In addition, in the optical path conversion sheets 52a to 52d, the extending directions of the protrusions 52t are staggered by 90 degrees (see Figure 10 ,exist Figure 10 (In the figure, the extending direction of the protrusion 52t is indicated by an arrow.) Here, the extending direction of the protrusion 52t refers to the direction in which, when the surface of the optical path conversion sheets 52a to 52d (the surface where the protrusion 52t is located) is viewed from the front (in this embodiment, viewed from the bottom), the substantially vertical surface 52t1 associated with the protrusion 52t is located on the right side, and the inclined surface 52t2 associated with the protrusion 52t is located on the left side.

[0128] In this embodiment, the extension direction of the protrusion 52t in the optical path conversion plate 52a is perpendicular to the conveying direction of the container film 3 (bag portion 2), and is a direction from one end side of the width direction of the container film 3 to the other end side of the width direction (a direction from a row on one end side to a row on the other end side in the bag portion 2).

[0129] Further, the extending direction of the protruding strip portion 52t in the optical path conversion sheet 52b is parallel to the conveying direction of the container film 3 (bag portion 2), and is in the same direction as the conveying direction.

[0130] In addition, the extending direction of the protruding strip portion 52t in the optical path conversion sheet 52c is perpendicular to the conveying direction of the container film 3 (bag portion 2), and is in the direction from the other end side in the width direction of the container film 3 toward the one end side in the width direction (the direction from the columns at the other end side toward the columns at the one end side in the bag portion 2).

[0131] In addition, the extending direction of the protruding strip portion 52t in the optical path conversion sheet 52d is parallel to the conveying direction of the container film 3 (bag portion 2), and is in the direction opposite to the conveying direction.

[0132] Moreover, in the present embodiment, the light reflected at one side wall region AR1 in the bag portion 2 located at a prescribed first position P1 (refer to Figure 14 ) is incident on the inclined surface 52t2 in the optical path conversion sheet 52a. At the same time, through the optical path conversion sheet 52a, the optical path of the light reflected at the one side wall region AR1 is converted into an optical path along the optical axis OA.

[0133] Further, the light reflected at one side wall region AR2 in the bag portion 2 located at a prescribed second position P2 (refer to Figure 16 、 Figure 17 ) is incident on the inclined surface 52t2 in the optical path conversion sheet 52b. At the same time, through the optical path conversion sheet 52b, the optical path of the light reflected at the one side wall region AR2 is converted into an optical path along the optical axis OA.

[0134] In addition, the light reflected at one side wall region AR3 in the bag portion 2 located at a prescribed third position P3 (refer to Figure 19 ) is incident on the inclined surface 52t2 in the optical path conversion sheet 52c. At the same time, through the optical path conversion sheet 52c, the optical path of the light reflected at the one side wall region AR3 is converted into an optical path along the optical axis OA.

[0135] Furthermore, the light reflected at one side wall region AR4 in the bag portion 2 located at a prescribed fourth position P4 (refer to Figure 21 、 Figure 22 ) is incident on the inclined surface 52t2 in the optical path conversion sheet 52d. At the same time, through the optical path conversion sheet 52d, the optical path of the light reflected at the one side wall region AR4 is converted into an optical path along the optical axis OA.

[0136] Return to Figure 7 、 Figure 8The object-side lens 53 is positioned between the camera 54 and the lighting device 51, focusing the light that has undergone optical path conversion by the optical path conversion sheets 52a to 52d. In this embodiment, the object-side lens 53 is composed of a Fresnel lens, formed by forming serrated protrusions in a stepped and concentric pattern on a predetermined resin sheet. Each protrusion functions as a refractive surface, allowing the object-side lens 53 to function similarly to a conventional lens.

[0137] The camera 54 is located on the opening side of the bag portion 2 of the container film 3 and is composed of a camera (such as a CCD camera or a CMOS camera) that is sensitive to light emitted by the lighting device 51. The camera 54 includes an aperture 54a, an element-side lens 54b, and an imaging element 54c.

[0138] The aperture 54a is located between the object side lens 53 and the element side lens 54b and is used to limit the amount of light entering the imaging element 54c from the object side lens 53, thereby adjusting the light formed on the light receiving surface 54c1 of the imaging element 54c.

[0139] The element-side lens 54 b converts the optical path of the light that has passed through the object-side lens 53 so that the optical axis OA is parallel to the principal ray.

[0140] The imaging element 54c is composed of, for example, a CCD area array sensor or a CMOS sensor, and is used to capture light emitted from the illumination device 51. The imaging element 54c has a light-receiving surface 54c1 on which a plurality of light-receiving elements are arranged two-dimensionally in a matrix. The light-receiving surface 54c1 is positioned perpendicular to the optical axis OA. The camera 54 performs imaging processing, and the imaging element 54c captures image data. The captured image data is transmitted to the image processing device 55.

[0141] Furthermore, in this embodiment, the object-side lens 53, the aperture 54a, and the element-side lens 54b constitute an imaging optical system 56. This imaging optical system 56 is used to image the light, whose optical path has been converted by the optical path conversion plates 52a to 52d, onto the imaging element 54c (light-receiving surface 54c1). The imaging optical system 56 is configured as an object-side telecentric optical system. In other words, the imaging optical system 56 is configured so that the optical axis OA and the principal ray are parallel on the object side (the bag portion 2 side) relative to the object-side lens 53. Furthermore, the imaging optical system 56 in this embodiment is also a bilaterally telecentric optical system.

[0142] The image processing device 55 determines whether at least the side wall portion 2b of the bag portion 2 is qualified based on the image data obtained by the light formed on the imaging element 54c (light receiving surface 54c1) (i.e., the image data obtained by the camera 54). The image processing device 55 is configured as a so-called computer system, which has a CPU as a calculation mechanism, a ROM for storing various programs, and a RAM for temporarily storing various data such as calculation data and input and output data. Figure 5 As shown, the image processing device 55 includes an image memory 55a, an inspection result storage device 55b, a determination memory 55c, an inspection condition storage device 55d, a camera timing control device 55e, a CPU, and an input / output interface 55f.

[0143] Image memory 55a stores image data input from camera 54. Inspection of the sidewall 2b is performed based on the image data stored in image memory 55a. Of course, the image data can be processed during the inspection. For example, shading or shadow correction can be performed.

[0144] The inspection result storage device 55b stores the data of the pass / fail judgment result and statistical data obtained by probabilistically statistically processing the data.

[0145] The judgment memory 55c stores various information used in the inspection, including a program for judging the presence of foreign matter, dirt, and defective bag 2 molding (wrinkles, damage, etc.), and various judgment values constituting the criteria for judging whether the bag is acceptable.

[0146] The inspection condition storage device 55d stores the date and time of the failure determination, the inspection conditions used for the inspection, and the like.

[0147] The camera timing control device 55e controls the shooting timing of the camera 54. More specifically, the camera timing control device 55e controls the camera 54 to shoot when a row of bags 2 arranged in a direction perpendicular to the conveying direction is at a first position P1, a second position P2, a third position P3, and a fourth position P4.

[0148] In this embodiment, by photographing the bag portion 2 at the first position P1, image data including a portion related to the side wall area AR1 can be acquired (see FIG. Figure 15 ; Again, in Figure 15 、 Figure 18 、 Figure 20 and Figure 23 In the figure, only part of the image data is shown.) Furthermore, by photographing the bag portion 2 at the second position P2, image data including the portion related to the side wall area AR2 can be obtained (seeFigure 18 ). In addition, by photographing the bag portion 2 located at the third position P3, image data including a portion related to the side wall area AR3 can be obtained (refer to Figure 20 ). In addition, by photographing the bag portion 2 located at the fourth position P4, image data including a portion related to the side wall area AR4 can be obtained (refer to Figure 23 The four image data acquired in this manner are image data related to different side wall areas AR1 to AR4. Furthermore, these four image data cover the entire outer periphery of the side wall portions 2b of all pocket portions 2 in one row.

[0149] Furthermore, the camera timing control device 55e controls the imaging timing of the camera 54 based on a signal from an encoder (not shown) provided in the PTP packaging machine 10 for grasping the conveying amount of the container film 3 (bag portion 2).

[0150] The CPU and the input / output interface 55f have the function of inputting and outputting various data such as image data and the results of the qualification determination, as well as the function of executing various programs. The CPU and the input / output interface 55f use the information stored in the determination memory 55c and the input image data to determine whether at least the side wall portion 2b in the bag portion 2 is qualified. In this embodiment, all the obtained image data are used as the object for the prescribed qualification determination processing. Thus, for each bag portion 2, four types of image data are used to determine whether there are unqualified parts on the entire periphery of the side wall portion 2b. The qualification determination results are stored in the inspection result storage device 55b. In this embodiment, the presence of foreign matter or dirt attached to the bag portion 2 and the presence of unqualified forming (wrinkles, ruptures, etc.) in the bag portion 2 are inspected.

[0151] As described above in detail, according to this embodiment, a plurality of bag portions 2 can be inspected at a time, thereby improving inspection efficiency.

[0152] Furthermore, the entire outer periphery of the side wall portion 2b of the bag portion 2 is covered by the plurality of side wall regions AR1 to AR4 corresponding to the optical path conversion sheets 52a to 52d, so that the entire outer periphery of the side wall portion 2b can be inspected.

[0153] In addition, compared with the conventional technique of photographing the bag portion 2 obliquely, it is possible to more reliably prevent the size (area) of one side wall region AR1 to AR4 in the image data from varying with the position of the bag portion 2. In this way, it is possible to suppress the difference in inspection accuracy due to the position of the bag portion 2. In addition, it is also possible to suppress the influence of light reflected from other parts in the bag portion 2 on the part related to one side wall region AR1 to AR4 in the image data, and to better clarify the contour and shape of the part related to one side wall region AR1 to AR4 in the image data and the defective part (such as dirt or foreign matter, etc.) located in this one side wall region AR1 to AR4. As a result, it is possible to determine with high precision whether there is a defective part in the side wall 2b and to more accurately specify the position of the defective part.

[0154] In addition, through the aperture 54a, it is also possible to adjust the light that forms an image on the imaging element 54c among the light whose optical path is converted by the optical path conversion sheets 52a to 52d. Therefore, on the basis of the inspection, it is possible to obtain suitable image data more reliably and more easily.

[0155] In addition, since the object side lens 53 is a Fresnel lens, the thickness of the object side lens 53 can be made relatively small. In this way, it is possible to suppress the enlargement of the inspection device 21, and at the same time, to increase the degree of freedom related to the installation of the container inspection device 21.

[0156] In addition, since the optical path conversion sheets 52a to 52d have the above cross-sectional shape, in each of the optical path conversion sheets 52a to 52d, the optical path of the light reflected or transmitted at the corresponding one side wall region AR1 to AR4 can be more reliably converted into an optical path along the optical axis OA direction of the imaging optical system 56. On the other hand, it is also possible to more effectively prevent the optical path of the light reflected at other parts in the bag portion 2 from being converted into an optical path along the optical axis OA direction. As a result, it is possible to more reliably display the part related to one side wall region AR1 to AR4, the contour and shape of the defective part in the image data. As a result, it is possible to determine with higher precision the presence or absence of a defective part in the side wall 2b, and at the same time, to more accurately specify the position of the defective part.

[0157] Furthermore, it is not limited to the description content of the above embodiments. For example, it can be implemented as follows. Of course, other application examples and modification examples not illustrated below are also possible.

[0158] (a) In the above embodiment, the wavelength of the light irradiated by the lighting device 51 is set to a wavelength that cannot transmit through the container film 3 (bag portion 2) with a normal thickness, but it can also be a wavelength that can transmit through the container film 3 (bag portion 2) with a normal thickness. In this case, it is also possible to determine the presence or absence of foreign matter or dirt, and defective formation (such as wrinkles or breakage, etc.) in the bag portion 2 based on the image data.

[0159] (b) In the above embodiment, the lighting device 51 is arranged on the opening side of the bag portion 2, and is configured to capture light reflected from the bag portion 2 by the imaging element 54c. Figure 24 As shown, the lighting device 51 may be disposed on the protruding side of the bag portion 2 and configured to capture light transmitted through the bag portion 2 using the imaging element 54 c.

[0160] With this configuration, by setting the wavelength of light emitted by the lighting device 51 to a wavelength that does not transmit through the container film 3 (bag portion 2) having a normal thickness, the presence of pinholes or molding defects in the bag portion 2 can be determined based on image data. On the other hand, by setting the wavelength of light emitted by the lighting device 51 to a wavelength that transmits through the container film 3 (bag portion 2) having a normal thickness, the presence of foreign matter, dirt, or molding defects in the bag portion 2 can be determined based on image data.

[0161] (c) In the above embodiment, four optical path conversion sheets 52a to 52d are provided, but the number of optical path conversion sheets may be changed as appropriate.

[0162] For example, Figure 25 As shown, three optical path conversion sheets 52e, 52f, and 52g can be provided, with the entire periphery of the side wall portion 2b being covered by the plurality of side wall regions corresponding to the optical path conversion sheets 52e, 52f, and 52g. In this case, the extension directions of the protrusions 52t on the optical path conversion sheets 52e, 52f, and 52g can differ by 120°.

[0163] Of course, a configuration may also be employed in which two or five or more optical path conversion sheets are provided, with the entire periphery of one side wall 2b being covered by the plurality of side wall regions corresponding to these optical path conversion sheets. Furthermore, from the perspective of improving inspection accuracy, it is preferable to arrange the plurality of side wall regions so that at least a portion of each overlaps with the other, as in the above-described embodiment.

[0164] (d) In the above embodiment, each of the optical path conversion sheets 52a to 52d is arranged so as to correspond to one row of bag portions 2. However, the optical path conversion sheets 52a to 52d may correspond to multiple rows of bag portions 2. In other words, the optical path conversion sheets 52a to 52d may be configured so as to simultaneously capture images of multiple rows of bag portions 2.

[0165] (e) Although the lighting device 51 in the above embodiment includes the light source 51a and the light guide plate 51b, the configuration of the lighting device can be modified as appropriate. For example, the lighting device may be configured with a plurality of light sources without the light guide plate.

[0166] (f) Figure 26 、 Figure 27As shown, a gap can also be formed between adjacent optical path conversion sheets 52b and 52c, allowing light reflected or transmitted through the flange 3a and bottom wall 2a to be captured through this gap. Furthermore, the image processing device 55 can determine the conformity of the flange 3a and bottom wall 2a based on the image data obtained from the light reflected or transmitted through the flange 3a and bottom wall 2a. In this case, not only can the side wall 2b be inspected, but also inspections related to the flange 3a and bottom wall 2a can be performed. Therefore, inspection efficiency can be improved compared to inspecting the side wall 2b and either the flange 3a or the bottom wall 2a separately.

[0167] (g) In the above embodiment, the container inspection device 21 (particularly the optical path conversion plates 52a to 52d, the object side lens 53 and the camera 54) is arranged on the opening side of the bag portion 2. However, Figure 28 As shown, the container inspection device 21 may be disposed on the protruding side of the bag portion 2. In this case, the outer surface of the bag portion 2 (side wall portion 2b) can be inspected based on image data obtained by light reflected from the bag portion 2.

[0168] (h) Figure 29 As shown, the lighting device 51 is composed of a light source 51a. The lighting device 51 (light source 51a) can also be arranged between a plurality of optical path conversion plates 52a to 52d. In this case, the lighting device 51 can be stored between the optical path conversion plates 52a to 52d, thereby reducing the size of the container inspection device 21.

[0169] (i) In the above embodiment, the surfaces of the optical path conversion sheets 52a to 52d (the surfaces where the protrusions 52t are formed) are located on the container film 3 (bag portion 2) side. Figure 30 As shown, the surfaces of the optical path conversion sheets 52a to 52d may be arranged on the opposite side to the container film 3 (bag portion 2), that is, on the side of the camera 54 (imaging element 54c).

[0170] (j) In the above embodiment, the side wall areas AR1 to AR4 corresponding to the optical path conversion plates 52a to 52d are each imaged at a separate timing. However, the image capture timing of at least two of the multiple side wall areas may be aligned. Thus, for example, the two side wall areas AR1 and AR4 may be imaged at the same timing. Of course, all side wall areas AR1 to AR4 may also be imaged at the same timing.

[0171] Furthermore, in the above-described embodiment, the image data regarding the side wall region is acquired through a single imaging operation, but the image data may be acquired through a plurality of imaging operations.

[0172] (k) In the above-described embodiment, the bag portion 2 has a rectangular shape when viewed from above, but the bag portion 2 may also have a circular or oval shape when viewed from above.

[0173] (l) In the above-described embodiment, the bag portion 2 as the "container" is connected to other bag portions 2 through the flange portion 3a, but the "container" is not connected to other "containers" and can be independent of each other. Therefore, the "container" can be a tray or the like for storing a specified content (such as food, etc.). Also, in this case, the trays are transported in a state of being arranged side by side in multiple columns by a transport mechanism such as a conveyor belt, and the side wall portions of the multiple trays being transported are inspected by the container inspection device 2.

[0174] (m) In the above-described embodiment, the container film 3 is formed of a colorless and transparent thermoplastic material such as PP or PVC, and the cover film 4 is formed of aluminum. In contrast, the container film 3 can be formed of a resin other than PP or PVC, and the cover film 4 can be formed of a metal material or a resin material other than aluminum. Also, the container film 3 is not limited to being colorless and transparent and can also be colored and transparent.

[0175] (n) In the above-described embodiment, the tablet 5 is exemplified as the content, but the content is not limited to the tablet and can also be, for example, a capsule, an electronic component, food, etc.

[0176] (o) In the above-described embodiment, the bag portions 2 are transported in a state of being arranged side by side in five columns, but the number of columns of the bag portions 2 being transported only needs to be multiple columns and is not limited to five columns.

[0177] [Description of Reference Signs]

[0178] 1... PTP sheet (blister sheet), 2... bag portion (container), 2a... bottom wall portion, 2b... side wall portion, 3... container film, 3a... flange portion, 4... cover film, 10... PTP packaging machine (blister packaging machine), 16... bag portion forming device (bag portion forming mechanism), 20... film receiving roller (transport mechanism), 21... container inspection device, 22... filling device (filling mechanism), 51... lighting device (irradiation mechanism), 52a, 52b, 52c, 52d... optical path conversion sheets, 52r... (back surface of the optical path conversion sheet), 52t... rib portion, 52t1... substantially vertical surface, 52t2... inclined surface, 53... object side lens, 54a... aperture, 54c... imaging element, 55... image processing device (judgment mechanism), 56... imaging optical system, AR1, AR2, AR3, AR4... one side wall region, OA... optical axis.

Claims

1. A container inspection device for inspecting side wall portions of a plurality of containers transported in a side-by-side state in multiple columns, characterized in that, The container inspection device includes: An irradiation mechanism that irradiates a predetermined light onto a plurality of the containers; An imaging element that captures the light irradiated from the irradiation mechanism; An optical path conversion sheet that can convert the optical path of the light irradiated from the irradiation mechanism and reflected or transmitted at a circumferentially continuous side wall area in the side wall portion; An imaging optical system that images the light whose optical path has been converted by the optical path conversion sheet onto the imaging element; and A determination mechanism that can determine whether the side wall portion is qualified based on the image data obtained from the light imaged on the imaging element; The optical path conversion sheet is configured such that when viewed from the imaging element side, it straddles multiple columns of the container and a plurality of the optical path conversion sheets are arranged along the conveying direction of the container, The plurality of the optical path conversion sheets respectively correspond to different ones of the side wall areas and are configured to convert the optical path of the light reflected or transmitted at the corresponding side wall area into an optical path along the optical axis direction of the imaging optical system, It is further configured such that the entire outer periphery of the side wall portion is covered by the plurality of the side wall areas corresponding to the respective optical path conversion sheets.

2. The container inspection device according to claim 1, wherein The imaging optical system is configured to form an object-side telecentric optical system and has an aperture that can adjust the light imaged on the imaging element.

3. The container inspection device according to claim 1, characterized in that, The imaging optical system has an object-side lens that focuses the light whose optical path has been converted by the optical path conversion sheet, The object-side lens is a Fresnel lens.

4. The container inspection device according to claim 1, wherein, A plurality of protruding strip portions are formed in parallel on the surface of the optical path conversion sheet, The protruding strip portion has: A basic vertical surface whose angle of the angle formed with respect to the flat back surface of the optical path conversion sheet in a cross-section perpendicular to the extending direction of the protruding strip portion is 80° or more and 95° or less; and An inclined surface whose angle of the angle formed with respect to the back surface in the cross-section is 10° or more and 50° or less.

5. The container inspection device according to claim 1, characterized in that, The irradiation mechanism is disposed between the plurality of the optical path conversion sheets.

6. The container inspection device according to claim 1, characterized in that, The plurality of the containers are connected by a flange portion that extends outward from the edge portion of the side wall portion, The imaging optical system is configured to be able to image the light that passes between the plurality of the optical path conversion sheets and is reflected or transmitted at the flange portion onto the imaging element, The determination mechanism can determine whether the flange portion is qualified based on the image data.

7. The container inspection device according to claim 1, wherein, The imaging optical system is configured to be able to image the light that passes between the plurality of the optical path conversion sheets and is reflected or transmitted at the bottom wall portion of the container onto the imaging element, The determination mechanism can determine whether the bottom wall portion is qualified based on the image data.

8. A blister packaging machine for manufacturing a blister sheet, the blister sheet being configured to cover a cover film on a container film in a state where contents are stored in a bag portion formed on the container film and the bag portion is closed, The blister packaging machine has: A bag portion forming mechanism that forms the bag portion on the strip-shaped container film; A conveying mechanism that conveys the container film to convey the bag portions in a state of being arranged side by side in multiple columns; A filling mechanism that fills the bag portions with the content; And The container inspection device according to claim 1; The container inspection device is configured to be disposed between the bag portion forming mechanism and the filling mechanism along the conveying path of the container film, and determine whether the side wall portions related to the bag portions as the containers are qualified.

Images