JP4876543B2 - Hologram foil inspection apparatus, printing machine, and hologram foil inspection method - Google Patents

Description

  The present invention relates to a hologram foil inspection apparatus for inspecting the attachment quality such as the shape of a hologram foil attached to an attachment medium such as paper sheets, a printing machine provided with this hologram foil inspection apparatus, and a hologram foil inspection apparatus thereof Hologram foil inspection method, in particular, hologram foil inspection apparatus and printing machine suitable for accurately inspecting the quality of hologram foil without being affected by irregular reflection by the diffraction grating or aluminum foil constituting the surface structure of the hologram foil And a hologram foil inspection method.

Hologram is a technique in which information is recorded in the form of interference fringes using a technique called holography, and holography is a technique for recording or reproducing all information of an object using laser light. Say.
A hologram is expected to have a high fraud prevention effect because it is difficult to counterfeit, and has a high source display function because it can display a three-dimensional image or a pattern. Therefore, in recent years, it has been used for various items such as banknotes, government bonds, securities, gift certificates, passports, cash vouchers, publications, wrapping paper, and credit cards.

By the way, in the manufacturing site which produces the thing with which the hologram foil was stuck, the sticking quality of the hologram foil is normally test | inspected.
The inspection method mainly includes a method in which an attached hologram foil is imaged by an imaging means and displayed on a screen for inspection, and a method in which an inspector directly visually inspects.

A specific example of an inspection method using an imaging unit among them will be described with reference to FIG.
A light source 110 and an image pickup means 120 are arranged so as to face the surface on which the hologram foil B is affixed among the front and back surfaces of the affixing medium A. Under the illumination by the light source 110, the imaging unit 120 images the surface to which the hologram foil B is attached. An imaging signal output from the imaging unit 120 is input to an AGC (Automatic Gain Controller) 130 to perform gain shooting correction processing, and a pattern to be inspected is obtained by signal processing in the signal conversion unit 140. The pattern to be inspected is sent to the comparator 150 and compared with the reference pattern extracted from the master memory 160 (pattern matching). The comparison result is sent to the defect determination unit 170, and it is determined whether or not the applied state of the hologram foil is a defect based on the comparison result (see, for example, Patent Documents 1 and 2).
According to such an inspection method, the pattern to be inspected is compared with the reference pattern, and if there is a difference, it can be determined that there is a defect, and thus it is useful as a simple method.
JP 09-096613 A (page 3, FIG. 8) Japanese Patent Application Laid-Open No. 2004-239834

  However, in the conventional method described above, for example, a method of simply imaging and inspecting the light reflected by the hologram foil, or a method of visually inspecting the image, it is drawn on the hologram foil depending on the observation direction due to the characteristics of the diffraction grating. Since the pattern pattern changes, there is a problem that accurate inspection cannot be guaranteed due to time constraints in mass production.

  That is, the quality inspection of the hologram foil affixed to the affixing medium is based on the characteristic that the surface structure of the hologram foil is in the form of a diffraction grating. If there is a slight flutter of the paper surface that occurs during the transfer of the sticking medium in a printing machine or the like, and the warping of the foil that occurs due to the pressing state in the process of thermal evaporation of the hologram foil sticking, it is stable and stable from the influence of the diffraction grating Since the reflected light in the direction cannot be obtained and a stable image cannot be obtained as an image, it has been difficult to realize the quality inspection of the pasted shape of the pasted hologram foil.

  The present invention has been considered in view of the above circumstances, and includes a hologram foil inspection apparatus, a printing machine, and a hologram foil inspection method capable of quality inspection of a hologram foil paste shape without being affected by a diffraction grating or the like. For the purpose of provision.

In order to achieve this object, the hologram foil inspection apparatus of the present invention is a hologram foil inspection apparatus for inspecting the quality of the paste shape of a hologram foil attached to a sticking medium, with the surface on which the hologram foil is attached facing down a conveying member for conveying the sticking medium in the, affixed to the surface of the carrier for conveying the sticking medium, a light emitter for emitting light to a surface of the hologram foil is attached at the attached media, and pasting medium and the hologram foil And an imaging means for holographic foil inspection for imaging the light that has passed through.

  When the hologram foil inspection apparatus has such a configuration, it is possible to capture the back surface of the pasting medium. That is, the light emitting body is disposed opposite to the surface of the pasting medium on the front and back surfaces where the hologram foil is affixed, and the imaging means is disposed opposite to the surface where the hologram foil is not affixed. Then, the light from the light emitter is irradiated onto the hologram foil, and the light transmitted through the hologram foil and the pasting medium is imaged by the imaging means. In such rear surface imaging, that is, a light transmission method is used, light is irradiated onto the hologram foil application surface of the application medium, and an image of the hologram foil non-application surface is acquired. Thereby, the quality of the paste shape of the hologram foil can be accurately inspected without being affected by irregular reflection by the diffraction grating and the aluminum foil constituting the surface structure of the hologram foil.

Note that a technique for imaging and inspecting the transmitted light of a hologram is disclosed in Patent Document 2 (paragraph [0055], etc., FIG. 20).
Here, the imaging means is arranged facing the front side of the hologram (the side where the image can be viewed), while the light source is arranged facing the back side. Then, when the light irradiated from the light source passes through the hologram, the transmitted light becomes diffracted light. Of the diffracted light, only the diffracted light in the normal direction with respect to the surface of the hologram is extracted and photographed by the imaging means.

  However, this method is intended for transmission type holograms rather than reflection type holograms. In other words, the hologram to be inspected by that method is placed so that both the front and back surfaces are exposed, and when irradiated from the back surface, the light transmitted to the surface becomes diffracted light and the reproduced image can be viewed visually. is there. That is, since the imaged light is diffracted light, it is affected by irregular reflection by the diffraction grating of the hologram and the aluminum foil. Therefore, this method cannot achieve the object of the present invention and is clearly different from the present invention.

In the hologram foil inspection apparatus of the present invention, the light emitter is composed of a light emitter formed in a thin sheet shape.
If the hologram foil inspection apparatus has such a configuration, even when the carrier and the pasting medium are very close to or in contact with each other, the light emitter can be inserted therebetween. Thereby, also when the hologram foil is affixed on the surface which approaches or contacts among the front and back two surfaces of a sticking medium, light can be irradiated to the hologram foil sticking surface. Therefore, the imaging means installed opposite to the hologram foil non-sticking surface can pick up the light emitted from the light emitter and transmitted through the hologram foil and the sticking medium.

In particular, in a printing machine that transports a pasting medium to which a hologram foil is pasted, a rotating drum (rotary drum) that is a transport body and a transporting pasting medium are in close contact with each other. For this reason, conventionally, it has been difficult to realize the back side imaging of a sticking medium with a printing press.
As a result of intensive studies, the inventor has found that rear imaging is possible by using a thin sheet-like light emitter. That is, the light-emitting body is wound around and pasted on the surface of the transport body, and the pasting medium is transported by the transport body. Thereby, a light-emitting body can irradiate light to the hologram foil sticking surface of a sticking medium, maintaining the function that a conveyance body conveys a sticking medium. Therefore, inspection of the paste quality of the hologram foil can be performed by imaging the back surface of the sticking medium.

  Further, the hologram foil inspection apparatus of the present invention includes a light source that irradiates light toward a sticking medium, and a solar cell panel that receives light emitted from the light source and photoelectrically converts the received light to generate electrical energy. And a capacitor that stores electrical energy generated in the solar cell panel and uses it as a power source for the light emitter.

When the hologram foil inspection apparatus has such a configuration, it can photoelectrically convert the energy of light emitted from the light source, thereby obtaining electric energy, and further storing the electric energy and supplying it as a power source to the light emitter. Can do. That is, the power source of the light emitter can be secured.
In addition, if the transport body is provided with all of the light emitter, the solar battery panel, and the capacitor, it is not necessary to take in the power source of the light emitter from the outside of the transport body. For this reason, a circuit configuration and wiring can be simplified.

Moreover, the hologram foil inspection apparatus of this invention is set as the structure by which the solar cell panel and / or the electrical storage device were equipped in the recessed part of the surface of a conveyance body.
If the hologram foil inspection apparatus has such a configuration, the solar cell panel, the electric storage device, and the transport body are not individually provided but can be integrated.

In the first to third aspects, a thin sheet-like light emitting body is attached to the surface of the transport body in order to realize the rear surface imaging of the pasting medium on which the hologram foil is pasted. Here, in the case where the light emitter does not move with the carrier but is fixed, the external power source and the light emitter can be easily connected. On the other hand, when the light emitter moves or rotates together with the carrier, it is very complicated in structure to draw the power from a fixed external power source.
Therefore, the solar cell panel and the capacitor are provided in the concave portion on the surface of the carrier. As a result, it is not necessary to draw in the power from the outside, so that it is possible to supply power to the light emitter while simplifying the structure.

  In addition, in the case of a rotary press that prints cut paper, the rotary drum (rotary drum) has a gripper mechanism that holds the paper when the paper is passed, and the rotary has a relatively large recess for forming the gripper. Located on the drum (rotary drum). For this reason, the charger of a solar cell panel can be built in the hollow.

  In addition, the hologram foil inspection apparatus of the present invention includes a first transport body that transports the pasting medium with the surface on which the hologram foil is pasted facing up, and a hologram foil of the pasting medium that is being transported by the first transport body. A surface light source for irradiating light on the surface on which the surface is affixed, an imaging means for surface inspection for imaging light irradiated from the surface light source and reflected by the affixing medium or hologram foil, and the surface on which the hologram foil is affixed A second conveying body that conveys the sticking medium in a direction, a light emitter is attached to the surface of the second conveying body, and the imaging means for hologram foil inspection is being conveyed by the second conveying body The light that has passed through the pasting medium is imaged.

  When the hologram foil inspection apparatus has such a configuration, in the first carrier, it is possible to inspect the surface of the application medium (the surface on which the hologram foil is attached) by the surface light source and the surface inspection imaging means. . Furthermore, in the second carrier, the paste quality of the hologram foil can be inspected by the light emitter and the imaging means for inspecting the hologram foil.

  In addition, the hologram foil inspection apparatus of the present invention includes a light source for the back surface that irradiates light on a surface of the pasting medium that is being transported by the second transport body, to which the hologram foil is not pasted, and a light source that is irradiated from the back light source The image forming apparatus includes a back surface inspection imaging unit that images the light reflected by the medium.

  If the hologram foil inspection apparatus has such a configuration, the second carrier can inspect the back surface (the surface on which the hologram foil is not attached) of the pasting medium with the light source for back surface and the imaging means for back surface inspection. It becomes.

Further, the printing machine of the present invention is a printing machine provided with a hologram foil inspection device that performs quality inspection of a paste shape of a hologram foil attached to a sticking medium. 6. The hologram foil inspection apparatus according to any one of 6 is included.

  When the printing machine has such a configuration, it is possible to image the transmitted light of the hologram foil stuck on the transported sticking medium, so that the influence of irregular reflection by the diffraction grating and the aluminum foil constituting the surface structure of the hologram foil is affected. The quality of the paste shape of the hologram foil can be accurately inspected without receiving it.

Further, the hologram foil inspection method of the present invention is a hologram foil inspection method for inspecting the quality of the attached shape of the hologram foil attached to the attachment medium, and the carrier is placed with the surface on which the hologram foil is attached facing down. transmitting a step of conveying the sticking medium, light emitter affixed to the surface of the carrier for conveying the sticking medium, a step of irradiating a light on a surface hologram foil is attached at the attached media, a patch medium and the hologram foil And a procedure in which the imaging means images the processed light.

  If the hologram foil inspection method is such a method, an imaging method from the back side of the pasting can be realized as a method of inspecting the pasting quality such as the pasting shape instead of the imaging method from the front side. For this reason, the quality inspection of the pasted shape of the hologram foil can be executed without being affected by the diffraction grating.

  As described above, according to the present invention, a light emitter serving as a light source is attached to the surface of a carrier that conveys a sticking medium, light emitted from the light emitter passes through the hologram foil, and the transmitted light is imaged. Since the configuration is such that the image is picked up by the means, the back side imaging of the sticking medium is realized, whereby the quality inspection of the sticking shape of the hologram foil can be performed without being affected by the diffraction grating or the like.

  Hereinafter, preferred embodiments of a hologram foil inspection apparatus, a printing machine, and a hologram foil inspection method according to the present invention will be described with reference to the drawings.

First, an embodiment of a hologram foil inspection apparatus and a printing machine according to the present invention will be described with reference to FIG.
This figure is a schematic side view showing the configuration of the hologram foil inspection apparatus of the present embodiment. Specifically, it is an example of a cylinder layout of a printing machine that prints on a sheet (a sticking medium) cut into a sheet shape. is there.

As shown in the figure, a hologram foil inspection apparatus (printing machine) 1 includes a transfer cylinder 10, a front inspection cylinder 20, a surface light source 30, a surface inspection camera 40, a back inspection cylinder 50, and a back surface. A light source 60, a back surface inspection camera 70, and a hologram foil inspection camera 80 are provided.
In addition, the hologram foil inspection apparatus 1 of this embodiment can be provided in a printing machine as a hologram foil inspection apparatus that performs a quality inspection of a hologram foil attached to a sticking medium.

The transfer cylinder 10 is a cylindrical rotating body (conveyance body) for transferring the sticking medium to the surface inspection cylinder 20.
The front inspection cylinder (first transport body) 20 is a cylindrical rotating body that transports the pasting medium with the surface on which the hologram foil is pasted facing up. The front inspection cylinder 20 conveys the pasting medium such that the surface on which the hologram foil is pasted is on the outside (front side).

The surface light source 30 irradiates light on the outer surface (the surface on which the hologram foil is adhered) of the pasting medium conveyed by the surface inspection cylinder 20.
The surface inspection camera (surface inspection imaging means) 40 images the light irradiated from the surface light source 30 and reflected by the sticking medium or the hologram foil. Based on the imaging result, the quality of the surface of the pasting medium is determined.

The back inspection cylinder (second transport body) 50 is a cylindrical rotating body that transports the pasting medium with the surface on which the hologram foil is pasted facing down. As shown in FIG. 2, the back inspection cylinder 50 includes a back inspection cylinder main body 51, a light emitter 52, a recess 53, a solar cell panel 54, and a capacitor 55.
The back inspection cylinder body 51 has a light emitter 52 wound around and pasted on the surface thereof. Further, the sticking medium is adsorbed on the surface and conveyed.
In addition, since the example of the inspection cylinder shown in FIG. 1 and FIG. 2 is a double cylinder and has a structure in which two sheet-like sticking media are adsorbed, as shown in FIG. Two light emitters 52 and two solar cell panels 54 are provided.

The light emitter 52 is formed in a thin sheet shape, and is attached to the surface of the back inspection cylinder main body 51. The light emitter 52 can be composed of, for example, an organic EL film light, and emits light when power is supplied from the outside.
FIG. 3 shows the positional relationship between the back inspection cylinder main body 51, the light emitter 52, and the pasting medium and the hologram foil inspection camera 80. As shown in the figure, a light emitter 52 is attached to the surface of the back inspection cylinder main body 51. The pasting medium is adsorbed on the surface of the light emitter 52 and conveyed. At this time, the surface on which the hologram foil is affixed is turned face down and conveyed. Then, the hologram foil inspection camera 80 images light transmitted through the hologram foil and the pasting medium.

The recessed portion 53 is a recessed portion formed on the surface of the back inspection cylinder main body 51.
In the case where the printing press 1 is a rotary press that prints cut paper, there is a gripper mechanism (rotating drum, inspection cylinder) that holds the paper when the paper is passed. A large depression is formed in the rotary drum. The recess can be used as the recess 53.

The solar cell panel 54 is provided in a recess 53 formed on the surface of the back inspection cylinder main body 51. The solar cell panel 54 receives light emitted from the light source 60 for the back surface during operation of the printing press and photoelectrically converts it to generate electromotive force (electric energy).
The battery 55 stores (charges) the electromotive force generated in the solar battery panel 54. The stored electromotive force becomes a power source of the light emitter 52. Thereby, the light emitter 52 can emit light upon receiving power supply from the solar cell panel 54 or the capacitor 55.

The light source 60 for the back surface irradiates light on the outer surface (the surface on which the hologram foil is not attached) of the sticking medium conveyed by the back inspection cylinder 50.
The back surface inspection camera (back surface inspection imaging means) 70 images light emitted from the back surface light source 50 and reflected by the sticking medium. Based on the imaging result, the quality of the back surface of the pasted medium is determined.
The hologram foil inspection camera (hologram foil inspection imaging means) 80 images light transmitted through the sticking medium (or the hologram foil and the sticking medium). The imaging signal output from the hologram foil inspection camera 80 is sent to the AGC 130 shown in FIG. 5 and used for quality determination of the hologram foil.

Next, the operation (hologram foil inspection method) of the hologram foil inspection apparatus of this embodiment will be described with reference to FIG.
This figure is a flowchart showing the procedure of the hologram foil inspection method of the present embodiment.

A hologram foil is attached to one of the front and back surfaces of the sticking medium. This affixed surface is the front surface, and the non-adhered surface is the back surface.
The sticking medium conveyed by the transfer cylinder 10 is transferred to the front inspection cylinder 20 and conveyed (step 10). At this time, the sticking medium is conveyed with the front side facing up and the back side facing down.
When the patch medium is being transported by the surface inspection cylinder 20, the surface light source 30 irradiates the surface of the patch medium (step 11), and the reflected light is imaged by the surface inspection camera 40 (paste). Imaging the surface of the medium, step 12).

Next, the sticking medium conveyed by the surface inspection cylinder 20 is transferred to the back inspection cylinder 50 and conveyed (step 13). At this time, the sticking medium is conveyed with the front side facing down and the back side facing up.
When the adhesive medium is being conveyed by the back inspection cylinder 50, the back surface light source 60 irradiates light on the back surface of the adhesive medium (step 14), and the reflected light is imaged by the back surface inspection camera 70 (adhesion). Imaging the back side of the medium, step 15).

Subsequently, when the pasting medium is being conveyed by the back inspection cylinder 50, the light emitter 52 irradiates the surface of the pasting medium with light (step 16), and the light transmitted through the pasting medium or the hologram foil is subjected to the hologram foil inspection. The image is taken by the camera 80 (step 17).
The imaged result is used for quality determination of the hologram foil.

As described above, according to the hologram foil inspection apparatus, the printing machine, and the hologram foil inspection method of the present embodiment, a thin sheet-like light emitter is attached to the surface of a carrier that conveys a sticking medium. The emitted light is transmitted through the hologram foil and the pasting medium, and this transmitted light is captured by the imaging means, so that the hologram foil is not affected by the irregular reflection by the diffraction grating or the aluminum foil constituting the surface structure of the hologram foil. The quality of the affixed shape can be accurately inspected.
In addition, a solar cell panel and a capacitor are provided as the power source for the light emitter, and these are housed in the recesses of the carrier, so that power can be supplied to the light emitter that rotates with the carrier, and the wiring is simplified. Can be achieved.

The preferred embodiments of the hologram foil inspection apparatus, printing machine, and hologram foil inspection method of the present invention have been described above. However, the hologram foil inspection apparatus, printing machine, and hologram foil inspection method according to the present invention are limited to the above-described embodiments. It goes without saying that various modifications can be made within the scope of the present invention.
For example, in the above-described embodiment, the paper sheet is taken as an example of the sticking medium. However, the sticking medium is not limited to the paper sheet, and for example, a sheet made of a film, vinyl, synthetic resin, plastic, or the like, A card etc. may be sufficient. However, it is necessary that the light from the light emitter is transmitted through the pasting medium, and the transmitted light is a material that can be imaged by the imaging means.
1 shows a configuration including two inspection cylinders, the number of inspection cylinders is not limited to two, and three or more inspection cylinders may be provided as necessary.

Furthermore, the hologram foil inspection apparatus and the printing machine in the above embodiments can be executed by a computer controlled by a program. That is, information processing (hologram foil inspection method) by a program (software) is specifically realized by using hardware resources (various means constituting a hologram foil inspection apparatus and a printing machine).
The program is provided by a recording medium, for example. As the recording medium, for example, a magnetic disk, an optical disk, a semiconductor memory, or any other means readable by a computer can be used.
Further, the program recorded on the recording medium can be loaded into the computer directly by the recording medium and read by the computer, or may be read by the computer via a communication line.

  Since the present invention relates to a hologram foil inspection apparatus that inspects the paste quality of hologram foil, the present invention can be used for apparatuses and devices having an inspection function of the hologram foil.

It is a side view which shows the structure of the hologram foil test | inspection apparatus of this invention. It is a side view which shows the structure of a back inspection cylinder. It is sectional drawing which shows the positional relationship of a sticking medium and the camera for hologram foil inspection. It is a flowchart which shows operation | movement of the hologram foil test | inspection apparatus of this invention. It is a side view which shows the structure of the conventional hologram foil inspection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hologram foil inspection apparatus 20 Front inspection cylinder 30 Light source for surface 40 Camera for surface inspection 50 Back inspection cylinder 51 Back inspection cylinder main body 52 Light emitter 53 Recessed part 54 Solar cell panel 55 Capacitor 60 Light source for back surface 70 Back surface inspection camera 80 Hologram foil Inspection camera

Claims (8)

A hologram foil inspection apparatus for performing a quality inspection of a paste shape of a hologram foil attached to a sticking medium,
A transport body for transporting the pasting medium with the surface on which the hologram foil is pasted facing down;
A light emitter which the affixed to the surface of the carrier for conveying the sticking medium, irradiating light to the surface on which the hologram foil is attached in the sticking medium,
An apparatus for inspecting hologram foil, comprising: an imaging means for inspecting hologram foil for imaging light transmitted through the hologram foil and the pasting medium. The holographic foil inspection apparatus according to claim 1, wherein the light emitter is a light emitter formed in a thin sheet shape. A light source that emits light toward the patch medium;
A solar cell panel that receives light emitted from the light source and photoelectrically converts the received light to generate electrical energy;
The holographic foil inspection apparatus according to claim 1, further comprising: a capacitor that stores electric energy generated in the solar cell panel and serves as a power source for the light emitter. The hologram foil inspection apparatus according to claim 3, wherein the solar cell panel and / or the capacitor is provided in a concave portion on a surface of the carrier. A first transport body for transporting the pasting medium with the surface on which the hologram foil is pasted facing up;
A light source for a surface that irradiates light onto the surface on which the hologram foil is affixed among the affixing medium being conveyed by the first conveyance body;
Imaging means for surface inspection for imaging light irradiated from the surface light source and reflected by the pasting medium or the hologram foil;
A second transport body that transports the pasting medium with the surface on which the hologram foil is pasted facing down;
The light emitting body is attached to the surface of the second transport body,
The hologram foil inspection apparatus according to any one of claims 1 to 4, wherein the hologram foil inspection imaging unit images light transmitted through the sticking medium being transported by the second transport body. A light source for a back surface that irradiates light to a surface of the pasting medium being transported by the second transport body to which the hologram foil is not pasted,
The hologram foil inspection apparatus according to claim 5, further comprising a back surface inspection imaging unit configured to image light emitted from the back surface light source and reflected by the pasting medium. It is a printing machine equipped with a hologram foil inspection device that performs quality inspection of the paste shape of a hologram foil attached to an attachment medium,
The said hologram foil inspection apparatus contains the hologram foil inspection apparatus in any one of Claims 1-6. The printing machine characterized by the above-mentioned. A hologram foil inspection method for inspecting the quality of the paste shape of a hologram foil affixed to an affixing medium,
A procedure in which a carrier conveys the affixing medium with the surface on which the hologram foil is affixed facing down;
A procedure in which a light emitter attached to the surface of the carrier that conveys the sticking medium irradiates light on the surface of the sticking medium to which the hologram foil is attached;
A method for inspecting a hologram foil, comprising: an imaging means for imaging light transmitted through the hologram foil and the pasting medium.

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