JP6401438B2 - Defect inspection apparatus and optical display device production system - Google Patents

Description

  The present invention relates to a defect inspection apparatus and an optical display device production system.

  Conventionally, as a production system for producing an optical display device such as a liquid crystal display, a production system described in Patent Document 1 is known. The optical display device is formed by bonding an optical member such as a polarizing plate to an optical display component such as a liquid crystal panel. On the upstream side of the bonding apparatus that bonds the optical display component and the optical member, a defect inspection apparatus that performs defect inspection of the optical member is provided.

  As a defect inspection device for an optical member conveyed on a line, a device including an illumination device arranged on one side of an optical member and an imaging device arranged on the other side of the optical member is known. Yes. As an illuminating device, a light source, a fiber optic cable that transmits light from the light source, a light guide member that guides light from the light source transmitted by the optical fiber cable and emits the light toward one surface of the optical member, and There is something with.

Japanese Patent No. 4307510

By the way, in order to realize high-speed inspection of an optical member, it is important to convey the optical member at high speed. However, when the optical member is transported at a high speed, the amount of light incident on the imaging device is decreased, and the defect detection sensitivity is decreased. Therefore, an illumination device that can irradiate a lot of light is required.
As a means for meeting such a demand, it is conceivable to use an illumination device (for example, one having a high-power laser light source) capable of emitting more light in place of the existing illumination device. However, if the illuminating device is simply replaced with one having a high output, the spectral distribution characteristics of the illuminating device will deviate greatly from the existing characteristics. As a result, the spectral distribution characteristic of the illumination device is greatly deviated from the spectral sensitivity characteristic of the imaging device. As a result, there has been a problem that it is difficult to accurately inspect the optical member for defects.

  The present invention has been made in view of such circumstances, can perform defect inspection of an optical member with high accuracy, and suppress a decrease in detection sensitivity even when the optical member is conveyed at high speed. An object of the present invention is to provide a defect inspection apparatus and an optical display device production system.

In order to achieve the above object, the present invention employs the following means.
(1) That is, the defect inspection apparatus according to the first aspect of the present invention is a defect inspection apparatus for an optical member conveyed on a line, and the illumination apparatus disposed on one side of the optical member; An imaging device disposed on the other side of the optical member, wherein the illumination device includes a plurality of light sources having the same spectral distribution characteristics, and branch portions corresponding to each of the plurality of light sources. A plurality of branch optical fiber cables that collectively transmit the light from the light sources connected to the unit, and one of the optical members that guides the light from the plurality of light sources transmitted by the plurality of branch optical fiber cables. A light guide member that emits light toward the side surface, wherein the imaging device captures an image of light that is emitted from the light guide member and transmitted through the optical member, and the light guide member includes the optical member. One side of member A plurality of branched optical fibers arranged in parallel and extending in a direction perpendicular to the transport direction of the optical member and having one longitudinal end and the other end in the longitudinal direction of the light guide member A bifurcated optical fiber cable is connected as a cable one by one, and the imaging device has a spectral sensitivity characteristic that maximizes the spectral sensitivity at a wavelength that matches the peak wavelength at which the relative light output of the spectral distribution characteristic is maximum. Features.

(2) The optical display device production system according to the first aspect of the present invention is an optical display device production system in which an optical member is bonded to an optical display component for transporting the optical member. A bonding apparatus that bonds the optical member conveyed by the conveying apparatus to the optical display component to produce the optical display device, and the optical member that is conveyed from the conveying apparatus to the bonding apparatus. And the defect inspection apparatus according to the above (1) for inspecting the presence or absence of defects.

  ADVANTAGE OF THE INVENTION According to this invention, the defect inspection of the optical member which can perform the defect inspection of an optical member with high precision, and can suppress that a detection sensitivity falls even if an optical member is conveyed at high speed. A production system can be provided.

It is a side view which shows the apparatus structure of the film bonding system of one Embodiment of this invention. It is a side view which shows the apparatus structure of a film bonding system. It is a top view of a liquid crystal panel. It is sectional drawing of a polarizing film sheet. It is a side view which shows the defect inspection apparatus of one Embodiment of this invention. It is a top view of a defect inspection apparatus. It is a schematic diagram of a bifurcated optical fiber cable. It is a figure for demonstrating the relationship between the spectral distribution characteristic of a light source, and the spectral sensitivity characteristic of an imaging device. It is a figure for demonstrating a test object. It is a figure for demonstrating the test | inspection area | region of a test object. It is a figure which shows the relationship between a coordinate and a light quantity density value. It is the figure which compared the number of X pixels, the number of Y pixels, the number of defective pixels, the maximum density value, and the density | concentration integrated value about the comparative examples 1 and 2. It is a figure for demonstrating a test object. It is the figure which compared the X pixel number in each sample about a comparative example and an Example. It is the figure which compared the number of Y pixels in each sample about a comparative example and an Example. It is the figure which compared the maximum density value in each sample about a comparative example and an Example. It is the figure which compared the number of defective pixels in each sample about a comparative example and an Example. It is the figure which compared the number of X pixels, the number of Y pixels, the maximum density value, and the number of defective pixels about the comparative example and the Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

  In all the drawings below, the dimensions and ratios of the respective constituent elements are appropriately changed in order to make the drawings easy to see. In the following description and drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

  In the following description, an XYZ orthogonal coordinate system is set as necessary, and the positional relationship of each member will be described with reference to this XYZ orthogonal coordinate system. In the present embodiment, the transport direction of the liquid crystal panel, which is an optical display component, is the X direction, and the direction orthogonal to the X direction (the width direction of the liquid crystal panel) in the plane of the liquid crystal panel is the Y direction, X direction, and Y direction. The direction orthogonal to the Z direction is taken as the Z direction.

Hereinafter, as an optical display device production system according to an embodiment of the present invention, a film bonding system constituting a part thereof will be described.
FIG.1 and FIG.2 is a side view which shows the apparatus structure of the film bonding system 1 of this embodiment.
The film bonding system 1 bonds a film-shaped optical member such as a polarizing film, an antireflection film, and a light diffusion film to a panel-shaped optical display component such as a liquid crystal panel or an organic EL panel.

  In addition, in this embodiment, liquid crystal panel P is illustrated as an optical display component, and the double-sided bonding panel formed by bonding the bonding sheet | seat F5 on the front and back both surfaces of liquid crystal panel P is illustrated as an optical member bonding body. However, the present invention is not limited to this.

  As shown in FIG.1 and FIG.2, the film bonding system 1 of this embodiment is provided as one process of the manufacturing line of liquid crystal panel P. As shown in FIG. Each part of the film bonding system 1 is comprehensively controlled by the control part 2 as an electronic control apparatus.

  The film bonding system 1 of the present embodiment reverses the orientation of the liquid crystal panel P by 90 ° in the middle with respect to the transport direction of the liquid crystal panel P. The film bonding system 1 bonds the polarizing film F1 on the front and back surfaces of the liquid crystal panel P so that the polarization axes are orthogonal to each other.

  FIG. 3 is a plan view of the liquid crystal panel P as viewed from the thickness direction of the liquid crystal layer P3. The liquid crystal panel P includes a first substrate P1 that has a rectangular shape in plan view, a second substrate P2 that has a relatively small rectangular shape that is disposed to face the first substrate P1, a first substrate P1, and a second substrate. And a liquid crystal layer P3 sealed between the substrate P2. The liquid crystal panel P has a rectangular shape that follows the outer shape of the first substrate P1 in a plan view, and a region that fits inside the outer periphery of the liquid crystal layer P3 in a plan view is a display region P4.

FIG. 4 is a cross-sectional view of the optical sheet F including the optical member F1 bonded to the liquid crystal panel P. In FIG. 4, hatching of each layer in the cross-sectional view is omitted for convenience.
As shown in FIG. 4, the optical sheet F includes a film-like optical member F1, an adhesive layer F2 provided on one surface (upper surface in the drawing) of the optical member F1, and the optical member F1 via the adhesive layer F2. The separator F3 is detachably stacked on one surface of the optical member F1, and the surface protective film F4 is stacked on the other surface (lower surface in the drawing) of the optical member F1. The optical member F1 functions as a polarizing plate, and is bonded over the entire display area P4 of the liquid crystal panel P and its peripheral area.

  The optical member F1 is bonded to the liquid crystal panel P via the adhesive layer F2 in a state where the separator F3 is separated while leaving the adhesive layer F2 on one surface thereof. Hereinafter, the part remove | excluding the separator F3 from the optical sheet F is called the bonding sheet | seat F5.

  The separator F3 protects the adhesive layer F2 and the optical member F1 until it is separated from the adhesive layer F2. The surface protective film F4 is bonded to the liquid crystal panel P together with the optical member F1. The surface protective film F4 is disposed on the side opposite to the liquid crystal panel P with respect to the optical member F1, protects the optical member F1, and is separated from the optical member F1 at a predetermined timing. The optical sheet F may be configured not to include the surface protective film F4, or the surface protective film F4 may be configured not to be separated from the optical member F1.

  The optical member F1 includes a sheet-like polarizer F6, a first film F7 bonded to one surface of the polarizer F6 with an adhesive or the like, and a first film F7 bonded to the other surface of the polarizer F6 with an adhesive or the like. 2 film F8. The first film F7 and the second film F8 are protective films that protect the polarizer F6, for example.

  The optical member F1 may have a single-layer structure including a single optical layer, or may have a stacked structure in which a plurality of optical layers are stacked on each other. In addition to the polarizer F6, the optical layer may be a retardation film, a brightness enhancement film, or the like. At least one of the first film F7 and the second film F8 may be subjected to a surface treatment capable of obtaining an effect such as a hard coat treatment for protecting the outermost surface of the liquid crystal display element or an antiglare treatment. The optical member F1 may not include at least one of the first film F7 and the second film F8. For example, when the first film F7 is omitted, the separator F3 may be bonded to one surface of the optical member F1 via the adhesive layer F2.

Next, the film bonding system 1 of this embodiment is demonstrated in detail.
As shown in FIG.1 and FIG.2, the film bonding system 1 of this embodiment is the conveyance direction downstream of the liquid crystal panel P of the left side in a figure from the conveyance direction upstream (+ X direction side) of the liquid crystal panel P of the right side in the figure. A driving roller conveyor 3 is provided which reaches the side (−X direction side) and conveys the liquid crystal panel P in a horizontal state.

  The roller conveyor 3 is divided into an upstream conveyor and a downstream conveyor with a reversing device (not shown) as a boundary. In the upstream conveyor, the liquid crystal panel P is transported so that the long side of the display area P4 is along the transport direction. On the other hand, on the downstream conveyor, the liquid crystal panel P is transported so that the short side of the display area P4 is along the transport direction. A bonding sheet F5 cut out to a predetermined length from the belt-shaped optical sheet F is bonded to the front and back surfaces of the liquid crystal panel P.

  The film bonding system 1 of the present embodiment includes a first supply device 7, a first bonding device 11, a reversing device, a second supply device, a second bonding device, an inspection device, and a control unit 2. In addition, about the inversion apparatus, the 2nd supply apparatus, the 2nd bonding apparatus, and the test | inspection apparatus, the illustration is abbreviate | omitted for convenience.

  In FIG. 1, the 1st supply apparatus 7 is mentioned and demonstrated as an apparatus structure of the film bonding system 1 among a 1st supply apparatus and a 2nd supply apparatus. Since the second supply device has the same configuration as that of the first supply device 7, detailed description thereof is omitted.

  As shown in FIG. 1, the 1st supply apparatus 7 draws out the optical sheet F from the original fabric roll R1 which wound the strip | belt-shaped optical sheet F, and supplies it after cut | disconnecting to predetermined size. The first supply device 7 includes a first transport device 8, a pre-inspection peeling device 18, a first defect inspection device 9, a post-inspection bonding device 19, and a first cutting device 10.

  The first transport device 8 is a transport mechanism that transports the optical sheet F along its longitudinal direction. The 1st conveying apparatus 8 has the roll holding | maintenance part 8a, the nip roller 8b, the guide roller 8c, the accumulator 8d, and the winding-up part 8e (refer FIG. 2).

  The roll holding unit 8a holds the original roll R1 around which the belt-shaped optical sheet F is wound, and feeds the optical sheet F along its longitudinal direction.

  The nip roller 8b sandwiches the optical sheet F so as to guide the optical sheet F unwound from the original roll R1 along a predetermined conveyance path.

  The guide roller 8c changes the traveling direction of the optical sheet F being conveyed along the conveyance path. At least one of the plurality of guide rollers 8c functions as a tension roller. That is, it moves to adjust the tension of the optical sheet F being conveyed.

  The accumulator 8d absorbs the feeding amount of the optical sheet F conveyed from the roll holding unit 8a while the optical sheet F is cut by the first cutting device 10.

  The roll holding unit 8a positioned at the start point of the first transport device 8 and the winding unit 8e (see FIG. 2) positioned at the end point of the first transport device 8 are driven in synchronization with each other, for example. Thereby, the winding part 8e winds up the separator F3 which passed through the 1st bonding apparatus 11, while the roll holding | maintenance part 8a pays out the optical sheet F to the conveyance direction. Hereinafter, the upstream side in the transport direction of the optical sheet F (separator F3) in the first transport device 8 is referred to as a sheet transport upstream side, and the downstream side in the transport direction is referred to as a sheet transport downstream side.

  The pre-inspection peeling device 18 has a configuration in which the first separator H1 (corresponding to the separator F3) is peeled from the optical sheet F conveyed from the upstream side of the sheet conveyance and wound on a roll. The pre-inspection peeling device 18 includes a knife edge 18a and a winding portion 18b.

  The knife edge 18a extends at least over its entire width in the width direction of the optical sheet F. The knife edge 18a is wound so as to be in sliding contact with the first separator H1 side of the optical sheet F unwound from the raw roll R1. The knife edge 18a winds the optical sheet F at an acute angle at its tip. The knife edge 18a separates the bonding sheet F5 from the first separator H1 when the optical sheet F is folded back at an acute angle at the tip portion. The knife edge 18a supplies the bonding sheet F5 to the first defect inspection apparatus 9.

  The winding unit 18b winds up the first separator H1 that has become independent through the knife edge 18a and holds it as a first separator roll R2.

  The 1st defect inspection apparatus 9 performs the defect inspection of the optical sheet F after peeling of the 1st separator H1, ie, the bonding sheet | seat F5. The first defect inspection device 9 analyzes the image data picked up by the CCD camera to inspect for the presence or absence of a defect, and if there is a defect, calculates the position coordinates. The position coordinates of this defect are provided for the skip cut by the first cutting device 10. Details of the first defect inspection apparatus 9 will be described later.

  The post-inspection bonding apparatus 19 bonds the second separator H2 (corresponding to the separator F3) to the bonding sheet F5 after the defect inspection through the adhesive layer F2. The post-inspection bonding apparatus 19 includes a roll holding unit 19a and a pinching roll 19b.

  The roll holding portion 19a holds the second separator roll R3 around which the band-shaped second separator H2 is wound and feeds the second separator H2 along the longitudinal direction thereof.

  The pinching roll 19b bonds the second separator H2 unwound from the second separator roll R3 to the lower surface (surface on the adhesive layer F2 side) of the bonding sheet F5 after defect inspection conveyed from the sheet conveying upstream side. . The pinching roll 19b has a pair of bonding rollers arranged in parallel with each other in the axial direction (the upper bonding roller moves up and down). A predetermined gap is formed between the pair of bonding rollers, and the inside of this gap is the bonding position of the post-inspection bonding apparatus 19. In the gap, the bonding sheet F5 and the second separator H2 are overlapped and introduced. The bonding sheet F5 and the bonding sheet F5 are sent out to the downstream side of the sheet conveyance while being pressed by the pressing roll 19b. Thereby, the 2nd separator H2 is bonded by the lower surface of the bonding sheet | seat F5 after a defect test | inspection, and the optical sheet F is formed.

  The first cutting device 10 performs a half cut for cutting a part in the thickness direction of the optical sheet F over the entire width in the width direction orthogonal to the longitudinal direction of the optical sheet F when the optical sheet F is fed out a predetermined length. Do.

  The first cutting device 10 adjusts the advancing / retreating position of the cutting blade so that the optical sheet F (separator F3) is not broken by the tension acting during the conveyance of the optical sheet F (so that a predetermined thickness remains in the separator F3). Then, half-cutting is performed to the vicinity of the interface between the adhesive layer F2 and the separator F3. In addition, you may use the laser apparatus replaced with a cutting blade.

  In the optical sheet F after half-cutting, the optical member F1 and the surface protection film F4 are cut in the thickness direction, whereby a cut line extending over the entire width in the width direction of the optical sheet F is formed. A plurality of cutting lines are formed so as to be arranged in the longitudinal direction of the belt-shaped optical sheet F. For example, in the case of the bonding process which conveys liquid crystal panel P of the same size, a plurality of score lines are formed at equal intervals in the longitudinal direction of optical sheet F. The optical sheet F is divided into a plurality of sections in the longitudinal direction by the plurality of cut lines. Each section sandwiched between a pair of cut lines adjacent in the longitudinal direction in the optical sheet F is a sheet piece in the bonding sheet F5.

  Based on the position coordinates of the defect calculated by the first defect inspection apparatus 9, the first cutting apparatus 10 cuts to a predetermined size so as to avoid a defective portion (skip cut). A cut product including a defective portion is excluded as a defective product in a subsequent process. Note that the first cutting apparatus 10 may continuously cut the optical sheet F into a predetermined size while ignoring the defective portion. In this case, in the bonding step between the bonding sheet F5 and the liquid crystal panel P, the cut product including the defective portion can be removed without bonding to the liquid crystal panel P.

  In FIG. 2, the 1st bonding apparatus 11 is mentioned and demonstrated as a apparatus structure of the film bonding system 1 among a 1st bonding apparatus and a 2nd bonding apparatus. Since the 2nd bonding apparatus is the structure similar to the 1st bonding apparatus 11, the detailed description is abbreviate | omitted.

  As shown in FIG. 2, the 1st bonding apparatus 11 bonds the bonding sheet | seat F5 cut into the predetermined size with respect to the upper surface of liquid crystal panel P introduced into the bonding position. The 1st bonding apparatus 11 has the knife edge 11a and the pinching roll 11b.

  The knife edge 11a supplies the bonding sheet F5 to the bonding position while winding the optical sheet F subjected to a half cut at an acute angle to separate the bonding sheet F5 from the separator F3.

  The pinching roll 11b bonds the bonding sheet F5 having a predetermined length separated from the optical sheet F by the knife edge 11a to the upper surface of the liquid crystal panel P conveyed by the upstream conveyor. The pinching roll 11b has a pair of laminating rollers that are arranged with their axial directions parallel to each other. A predetermined gap is formed between the pair of bonding rollers, and the inside of this gap is the bonding position of the first bonding apparatus 11. The liquid crystal panel P and the bonding sheet F5 are overlapped and introduced into the gap. These liquid crystal panel P and the bonding sheet | seat F5 are sent out to the panel conveyance downstream of an upstream conveyor, being pinched by the pinching roll 11b. Thereby, the bonding sheet | seat F5 is bonded integrally on the upper surface of liquid crystal panel P. FIG. Hereinafter, the panel after this bonding is called single-sided bonding panel P11.

  The winding unit 8e winds up the second separator H2 that has become independent through the knife edge 11a, and holds it as a second separator roll R4.

  The reversing device (not shown) conveys the liquid crystal panel P, which is provided downstream of the first bonding device 11 and reaches the end position of the upstream conveyor, to the start position of the downstream conveyor.

  The reversing device holds the single-sided bonding panel P11 that has reached the end position of the upstream conveyor via the first bonding device 11 by suction or clamping. The reversing device reverses the front and back of the single-sided bonding panel P11. The reversing device changes the direction so that, for example, the single-sided bonding panel P11 that has been transported in parallel with the long side of the display region P4 is transported in parallel with the short side of the display region P4.

  The inversion is performed when the optical members F1 bonded to the front and back surfaces of the liquid crystal panel P are arranged so that the directions of the polarization axes are perpendicular to each other.

  In the case of simply reversing the front and back of the liquid crystal panel P, for example, a reversing device having a reversing arm having a rotation axis parallel to the transport direction may be used. In this case, if the sheet conveyance direction of the first supply device 7 and the sheet conveyance direction of the second supply device are arranged so as to be perpendicular to each other in a plan view, the optical axes having the polarization axis directions perpendicular to each other on the front and back surfaces of the liquid crystal panel P The member F1 can be bonded.

  Since the second supply device has the same configuration as that of the first supply device 7, detailed description thereof is omitted. The second supply device draws the optical sheet F from the raw roll around which the belt-shaped optical sheet F is wound, and supplies the optical sheet F after cutting it into a predetermined size. Although not shown, the second supply device includes a second transport device, a pre-inspection peeling device, a second defect inspection device, a post-inspection bonding device, and a second cutting device.

  A 2nd bonding apparatus bonds the bonding sheet | seat F5 cut into predetermined size with respect to the upper surface of liquid crystal panel P introduce | transduced into the bonding position. The 2nd bonding apparatus has the same knife edge as the 1st bonding apparatus 11, and a pinching roll.

  The single-sided bonding panel P11 and the bonding sheet F5 are introduced into the gap between the pair of bonding rollers of the pinching roll (the bonding position of the second bonding apparatus), and the single-sided bonding panel P11. A bonding sheet F5 is integrally bonded to the upper surface of the sheet. Hereinafter, this panel after bonding is referred to as a double-sided bonding panel (optical member bonding body).

  The inspection device is provided on the downstream side of the panel conveyance from the second bonding device. The inspection device inspects for the presence or absence of defects (such as poor bonding) on the double-sided bonded panel. Examples of defects to be inspected include defects such as bites of foreign substances and bubbles when bonding the liquid crystal panel and the bonding sheet, scratches on the surface of the bonding sheet, and alignment defects inherent in the liquid crystal panel. .

  In addition, in this embodiment, the control part 2 as an electronic control apparatus which performs overall control of each part of the film bonding system 1 is comprised including the computer system. This computer system includes an arithmetic processing unit such as a CPU and a storage unit such as a memory and a hard disk. The control unit 2 of the present embodiment includes an interface that can execute communication with an external device of the computer system. An input device that can input an input signal may be connected to the control unit 2. The input device includes an input device such as a keyboard and a mouse, or a communication device that can input data from a device external to the computer system. The control unit 2 may include a display device such as a liquid crystal display that indicates the operation status of each unit of the film bonding system 1 or may be connected to the display device.

  An operating system (OS) that controls the computer system is installed in the storage unit of the control unit 2. The storage unit of the control unit 2 includes a program for causing the arithmetic processing unit to control each unit of the film bonding system 1 to execute processing for causing each unit of the film bonding system 1 to accurately convey the optical sheet F. It is recorded. Various types of information including programs recorded in the storage unit can be read by the arithmetic processing unit of the control unit 2. The control unit 2 may include a logic circuit such as an ASIC that performs various processes required for controlling each unit of the film bonding system 1.

  The storage unit is a concept including a semiconductor memory such as a RAM (Random Access Memory) and a ROM (Read Only Memory), an external storage device such as a hard disk, a CD-ROM reader, and a disk-type storage medium. Functionally, the storage unit includes program software in which the control procedure of the operation of the first supply device 7, the first bonding device 11, the reversing device, the second supply device, the second bonding device, and the inspection device is described. A storage area to be stored and various other storage areas are set.

(Defect inspection equipment)
Next, the defect inspection apparatus of this embodiment will be described in detail.

  FIG. 5 is a side view showing the defect inspection apparatus of the present embodiment. In FIG. 2, the first defect inspection apparatus 9 among the first defect inspection apparatus 9 and the second defect inspection apparatus 14 will be described as a defect inspection apparatus. Since the second defect inspection device 14 has the same configuration as the first defect inspection device 9, detailed description thereof is omitted. In FIG. 5, the code | symbol Sf1 is the lower surface (surface of the one side of an optical member) of the bonding sheet | seat F5, and is the surface by the side of the adhesion layer F2. The code | symbol Sf2 is the upper surface (surface of the other side of an optical member) of the bonding sheet | seat F5, and is a surface by the side of the surface protection film F4.

  As shown in FIG. 5, the 1st defect inspection apparatus 9 of this embodiment was arrange | positioned at the illuminating device 20 arrange | positioned at the lower surface Sf1 side of the bonding sheet | seat F5, and the upper surface Sf2 side of the bonding sheet | seat F5. And an imaging device 24.

  The illuminating device 20 includes a plurality of light sources having the same spectral distribution characteristics (for example, the first light source 21a, the second light source 21b, the third light source 21c, and the fourth light source 21d in this embodiment) and two multi-branch optical fibers. A cable (for example, in the present embodiment, a first two-branch optical fiber cable 22a and a second two-branch optical fiber cable 22b) and a light guide member 23 are provided. In the following description, the first light source 21a, the second light source 21b, the third light source 21c, and the fourth light source 21d may be collectively referred to as “light source 21”. The first two-branch optical fiber cable 22a and the second two-branch optical fiber cable 22b may be collectively referred to as “two-branch optical fiber cable 22”.

  In the present embodiment, four light sources are exemplified as the plurality of light sources. However, the present invention is not limited to this, and five or more light sources may be used. In addition, although a two-branch optical fiber cable is described as an example of the multi-branch optical fiber cable, the present invention is not limited to this, and a multi-branch optical fiber cable having three or more branches may be used.

  Each light source 21 is connected to a branch portion of each bifurcated optical fiber cable 22. For example, a metal halide lamp can be used as the light source 21. For example, the output of one light source 21 is 180W. Note that the output of one light source is not limited to this, and can be appropriately set as necessary.

  The imaging device 24 includes a plurality of cameras (for example, in the present embodiment, a first camera 24a, a second camera 24b, a third camera 24c, a fourth camera 24d, a fifth camera 24e, a sixth camera 24f, a seventh camera 24g, An eighth camera 24h and a ninth camera 24i) are provided. In the following description, the first camera 24a, the second camera 24b, the third camera 24c, the fourth camera 24d, the fifth camera 24e, the sixth camera 24f, the seventh camera 24g, the eighth camera 24h, and the ninth camera 24i. May be collectively referred to as “camera 24x”.

  In the present embodiment, nine cameras are exemplified and described as the plurality of cameras. However, the present invention is not limited to this, and a plurality of cameras of 8 or less or 10 or more may be used.

  The plurality of cameras 24x are arranged in a line along the Y direction. The light receiving surface of the camera 24x faces the light exit surface 20a of the lighting device 20 (the surface of the light guide member 23 on the bonding sheet F5 side) with the bonding sheet F5 interposed therebetween. The camera 24x captures a transmitted light image of light emitted from the light guide member 23 and transmitted straight through the bonding sheet F5.

  FIG. 6 is a plan view of the first defect inspection apparatus 9. In FIG. 6, the bonding sheet | seat F5 is illustrated for convenience.

  As shown in FIG. 6, the light guide member 23 is rectangular and has a length along the Y direction. The light guide member 23 is arranged in parallel with the lower surface Sf1 of the bonding sheet F5 and extends in the width direction perpendicular to the conveyance direction of the bonding sheet F5. The light guide member 23 is formed across the width direction with respect to the bonding sheet F5. For example, a quartz rod can be used as the light guide member 23.

  In the present embodiment, the first bifurcated optical fiber cable 22a is connected to one end portion (end portion on the −Y direction side) in the longitudinal direction of the light guide member 23, and the other in the longitudinal direction of the light guide member 23. The second bifurcated optical fiber cable 22b is connected to the end (the end on the + Y direction side).

  In the present embodiment, the two-branch optical fiber cable 22 is connected to one end and the other end in the longitudinal direction of the light guide member 23 one by one, but the present invention is not limited to this. For example, one bifurcated optical fiber cable 22 may be connected to only one end of the light guide member 23 in the longitudinal direction. However, from the viewpoint of transmitting more light to the light guide member 23, one bifurcated optical fiber cable 22 is provided at each end of one end and the other end of the light guide member 23 in the longitudinal direction. It is preferable that they are connected.

  Similarly to the light guide member 23, the imaging device 24 also has a length along the Y direction. For example, a line camera can be used as the imaging device 24. The imaging device 24 includes a first camera 24a, a second camera 24b, a third camera 24c, a fourth camera 24d, a fifth camera 24e, a sixth camera 24f, a seventh camera 24g, an eighth camera 24h and the like from the + Y direction side. The ninth camera 24i is arranged in this order. The camera 24x is disposed at a position overlapping the light guide member 23 in plan view. Each camera 24x is arranged at a predetermined interval along the Y direction.

  FIG. 7 is a schematic diagram of the two-branch optical fiber cable 22. In FIG. 7, as the two-branch optical fiber cable 22, the first two-branch optical fiber cable 22a among the first two-branch optical fiber cable 22a and the second two-branch optical fiber cable 22b will be described. Since the second two-branch optical fiber cable 22b has the same configuration as the first two-branch optical fiber cable 22a, detailed description thereof is omitted.

  As shown in FIG. 7, the first two-branch optical fiber cable 22a includes a branch part 22D (first branch part 22D1 and second branch part 22D2) corresponding to each of the two light sources 21, and a base end of the branch part 22D. And a main body 22M having one end connected to the main body 22M. The 1st light source 21a (refer FIG. 5) is connected to the front-end | tip part of 1st branch part 22D1. A second light source 21b (see FIG. 5) is connected to the tip of the second branch portion 22D2. One end of the light guide member 23 (see FIG. 5) is connected to the other end of the main body 22M.

  The first two-branch optical fiber cable 22a includes the light from the first light source 21a (see FIG. 5) connected to the first branch part 22D1 and the second light source 21b (see FIG. 5) connected to the second branch part 22D2. Are transmitted together in the main body 22M. The light from the first light source 21a and the second light source 21b transmitted by the first two-branch optical fiber cable 22a is guided by the light guide member 23 and emitted toward the lower surface Sf1 of the bonding sheet F5 ( (See FIG. 5).

  Returning to FIG. 6, in the present embodiment, since two two-branch optical fiber cables 22 are used and two light sources 21 are provided in each two-branch optical fiber cable 22, a total of four light sources are provided for the light guide member 23. The light emitted from 21 is collected.

  With such a configuration, the first defect inspection device 9 applies light from the lower surface Sf1 side to the bonding sheet F5, images the light transmitted through the bonding sheet F5 with the imaging device 24, and uses this imaging data. Based on this, the presence or absence of a defect in the bonding sheet F5 is inspected.

FIG. 8 is a diagram for explaining the relationship between the spectral distribution characteristic of the light source 21 and the spectral sensitivity characteristic of the imaging device 24.
As a spectral distribution characteristic measuring device, a light source device “LA-180Me” manufactured by Ushio Electric Co., Ltd. and a model “Spectroradiometer USR-30D” are used. As a method for measuring the spectral distribution characteristic, the light guide LGB1-8L500 is used at the maximum rated load of the lamp in the light source device, and measurement is performed at a position 100 mm from the light projection end.

  FIG. 8A shows the spectral distribution characteristics of the light source 21. FIG. 8A shows the average characteristic of the spectral distribution characteristics of the plurality of light sources 21. In FIG. 8A, the horizontal axis represents wavelength [nm], and the vertical axis represents relative light output [%].

  As shown in FIG. 8A, the light source 21 has a peak wavelength at which the relative light output of the spectral distribution characteristic is maximum (relative light output is 100%) at a wavelength of 545 nm.

  In the present embodiment, the plurality of light sources 21 have the same spectral distribution characteristics. Note that the spectral distribution characteristics of the light sources 21 are not limited to being completely coincident with each other, but may be substantially coincident with each other.

  Here, “substantially match” means that the spectral distribution characteristics of the light sources 21 may be slightly different within a range in which a large deviation does not occur between the spectral distribution characteristics of the light sources 21. For example, when the peak wavelength of the relative light output of the spectral distribution characteristic in the first light source is the first peak wavelength V1, and the peak wavelength of the relative light output of the spectral distribution characteristic in the second light source is the second peak wavelength V2, If the ratio V1 / V2 between the first peak wavelength V1 and the second peak wavelength V2 is in the range of 0.99 to 1.01, the first peak wavelength V1 and the second peak wavelength V2 are approximately It can be said that they are in agreement. If it is such a range, the shift | offset | difference between the spectral distribution characteristic of a 1st light source and the spectral distribution characteristic of a 2nd light source can fully be suppressed.

  FIG. 8B is a diagram showing the spectral sensitivity characteristics of the imaging device 24. FIG. 8B shows the average characteristic of the spectral sensitivity characteristics of the plurality of cameras 24 x constituting the imaging device 24. In addition, typical characteristics when the power supply voltage to the imaging device 24 is 12 V and the measurement ambient environment temperature is 25 ° C. are shown. In FIG. 8B, the horizontal axis represents wavelength [nm] and the vertical axis represents relative spectral sensitivity.

  As shown in FIG. 8B, the imaging device 24 has a peak wavelength at which the relative spectral sensitivity of the spectral sensitivity characteristic is maximum at a wavelength of 545 nm.

  As shown in FIGS. 8A and 8B, the imaging device 24 has a maximum spectral sensitivity (relative spectral sensitivity is at a peak wavelength (545 nm) at which the relative light output of the spectral distribution characteristic of the light source 21 is maximum. 1.0). Note that the peak wavelength of the relative distribution sensitivity of the spectral sensitivity characteristic in the imaging device 24 and the peak wavelength of the relative light output of the spectral distribution characteristic of the light source 21 are not necessarily completely matched, but may be substantially matched. Good.

  Here, “substantially match” does not cause a large difference between the peak wavelength of the relative distribution sensitivity of the spectral sensitivity characteristic in the imaging device 24 and the peak wavelength of the relative light output of the spectral distribution characteristic of the light source 21. This means that the peak wavelength of the relative distribution sensitivity of the spectral sensitivity characteristic in the imaging device 24 and the peak wavelength of the relative light output of the spectral distribution characteristic of the light source 21 may be slightly different. For example, when the peak wavelength of the relative distribution sensitivity of the spectral sensitivity characteristic in the imaging device 24 is the spectral sensitivity peak wavelength Vp and the peak wavelength of the relative light output of the spectral distribution characteristic of the light source 21 is the spectral distribution peak wavelength Vq, the spectral sensitivity peak. If the ratio Vp / Vq between the wavelength Vp and the spectral distribution peak wavelength Vq is in the range of 0.9 to 1.1, it can be said that the spectral sensitivity peak wavelength Vp and the spectral distribution peak wavelength Vq are almost the same. Within such a range, the shift between the peak wavelength of the relative distribution sensitivity of the spectral sensitivity characteristic in the imaging device 24 and the peak wavelength of the relative light output of the spectral distribution characteristic of the light source 21 can be sufficiently suppressed.

  As described above, according to the first defect inspection apparatus 9 of the present embodiment, the light emitted from the plurality of light sources 21 having the same spectral distribution characteristics is collected by the two-branch optical fiber cable 22 and is guided to the light guide member 23. The light gathered from the light guide member 23 is emitted toward the lower surface Sf1 of the bonding sheet F5. Therefore, much light can be irradiated to the bonding sheet | seat F5, maintaining the spectral distribution characteristic of the light source 21. FIG. Therefore, according to this embodiment, the defect inspection of the bonding sheet | seat F5 can be performed with high precision, and even if the bonding sheet | seat F5 is conveyed at high speed, it can suppress that a detection sensitivity falls.

  In addition, since one bifurcated optical fiber cable 22 is connected to one end and the other end in the longitudinal direction of the light guide member 23, only one end in the longitudinal direction of the light guide member 23 is connected to the two ends. Compared with the case where one branch optical fiber cable 22 is connected, more light is transmitted to the light guide member 23, and more light is transmitted from the light guide member 23 toward the lower surface Sf1 of the bonding sheet F5. It is injected. Therefore, the defect inspection of the bonding sheet F5 can be performed with higher accuracy, and even when the bonding sheet F5 is conveyed at high speed, it is possible to reliably suppress the detection sensitivity from being lowered.

  If the spectral distribution characteristic of the illumination device is greatly deviated from the spectral sensitivity characteristic of the imaging device, it becomes difficult to accurately inspect the bonding sheet for defects. On the other hand, according to the present embodiment, the imaging device 24 has the spectral sensitivity characteristic that maximizes the spectral sensitivity at the wavelength that matches the peak wavelength that maximizes the relative light output of the spectral distribution characteristic. It becomes easy to accurately perform the defect inspection of F5.

  As mentioned above, although the suitable embodiment example which concerns on this embodiment was demonstrated referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  Examples of the present invention will be described below, but the present invention is not limited thereto.

(Inspection target)
FIG. 9 is a diagram for explaining an inspection object.
As shown in FIG. 9, as an inspection object (inspection object of the camera 24x constituting the defect inspection apparatus), a sheet having a small scratch as a pseudo defect is used for the bonding sheet F5 conveyed from the raw roll. It was. The grade of the bonding sheet was SRW842EP8GR6-FS / 82-LS (F) (1250). The total length of the bonding sheet was 142 m.

(Conditions for comparative example)
Table 1 shows the conditions of the comparative example.

In the column of “Condition” in Table 1, “Speed” is the conveyance speed of the bonding sheet F5. The “threshold value” is a parameter for determining defect detection. For example, when the light amount setting value is 130, the threshold value +50 is 180. The “light quantity” is a value representing the light quantity density value received by the camera in 0 to 255 gradations. “Number of cycles” corresponds to the shutter speed of the camera.
The comparative examples (Comparative Examples 1 and 2) do not use a bifurcated optical fiber cable.

FIG. 10 is a diagram for explaining an inspection region to be inspected.
In FIG. 10, the conveyance direction of the bonding sheet | seat F5 is made into the Y direction, and the width direction orthogonal to the conveyance direction of the bonding sheet | seat F5 is made into the X direction. The upper part of FIG. 10 shows the relationship between the coordinates in the inspection region to be inspected and the light amount density value. The coordinates Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, and Y9 indicate the Y coordinate to be inspected from the upstream side of the sheet conveyance (the −Y direction side). Coordinates X3, X4, X5, and X6 indicate the X coordinates of the inspection target from the sheet width direction-X direction side. Here, since the end portion in the sheet width direction to be inspected is not inspected, the coordinates X1, X2 and the coordinates X7 and subsequent are omitted. The lower part of FIG. 10 shows a defect area in the inspection object.

  As shown in the upper part of FIG. 10, when the threshold is set to 175, the number of pixels detected as a defect (hereinafter sometimes referred to as the number of detected pixels) is 3 pixels in the Y direction, 2 pixels in the X direction, There are a total of four overlapping pixels, one pixel.

  Thereby, as shown in the lower part of FIG. 10, an area including the number of defective pixels of 4 pixels is determined as a defective area.

  FIG. 11 is a diagram illustrating the relationship between the coordinates and the light amount density value. In FIG. 11, the horizontal axis is coordinates (Y coordinate or X coordinate), and the vertical axis is a light amount density value. In FIG. 11, the light amount setting value is 128, and the threshold value is 175.

  As shown in FIG. 11, in the Y direction, the threshold is exceeded at three coordinates Y3, Y4, and Y5. In the X direction, the threshold is exceeded at two coordinates, X4 and X5. A portion exceeding the threshold value (3 pixels in the Y direction, 2 pixels in the X direction, and a total of 4 overlapping pixels) is determined as a defective area.

Returning to Table 1, each comparative example will be described.
(Comparative Example 1)
In Comparative Example 1, the conveyance speed of the bonding sheet F5 was 12 m / min. The threshold value was set to +50 with respect to the light amount setting value. The amount of light was 128. The number of cycles was 24000.
(Comparative Example 2)
In Comparative Example 2, the conveyance speed of the bonding sheet F5 was 16 m / min. The threshold value was set to +50 with respect to the light amount setting value. The amount of light was 128. The number of cycles was 18000. That is, the comparative example 2 is the thing which made the conveyance speed of the bonding sheet | seat F5 quicker with respect to the comparative example 1, and changed the cycle number.

(Evaluation of defect detection sensitivity)
For each of Comparative Examples 1 and 2, the defect detection sensitivity was evaluated. Using review software, the number of X pixels, the number of Y pixels, the number of defective pixels, the maximum density value, and the density integrated value were measured. As review software, “SCANTEC” manufactured by Nagase Sangyo Co., Ltd. was used.
Here, the “number of X pixels” is the number of defective pixels detected in the X direction. “Number of Y pixels” is the number of defective pixels detected in the Y direction. The “number of defective pixels” is the number of defective pixels exceeding the threshold. The “maximum density value” is the maximum density value in the defect area. The “density integrated value” is a value obtained by summing the densities within a certain range (the same number of pixels).

  The results are shown in FIG. FIG. 12 is a diagram illustrating measurement results of the number of X pixels, the number of Y pixels, the number of defective pixels, the maximum density value, and the density integrated value for Comparative Examples 1 and 2. In FIG. 12, Comparative Example 1 is used as a reference (Comparative Example 1 = 100 [%]).

  As a result of the evaluation, it was confirmed that the number of pixels and the density value were lower in Comparative Example 2 than in Comparative Example 1. That is, it was found that the detection sensitivity was lowered simply by increasing the conveying speed of the bonding sheet F5.

  The inventor has confirmed by the following evaluation that a decrease in detection sensitivity can be suppressed by using a two-branch optical fiber cable.

(Inspection target)
FIG. 13 is a diagram for explaining an inspection target.
As shown in FIG. 13, the bonding sheet F5 conveyed from the raw fabric roll was used as the inspection target. The grade of the bonding sheet | seat F5 was set to TRN041APS1-S / 82-SSC (1250). The total length of the bonding sheet F5 was 153 m. The conveyance direction of the bonding sheet | seat F5 was made into the bidirectional | two-way of the forward direction U1 and the reverse direction U2.

(Conditions for Comparative Examples and Examples)
Table 3 shows the conditions of the comparative example and the example.

In Table 3, “speed” is the conveyance speed of the bonding sheet F5. “Number of cycles” corresponds to the shutter speed of the camera. “Resolution (X)” is the resolution in the sheet width direction orthogonal to the sheet conveyance direction F5, and “Resolution (Y)” is the resolution in the sheet conveyance direction. The “threshold value (black)” is a parameter for determining a black defect (a defect that blocks transmitted light). The “threshold value (white)” is a parameter for determining a white defect (light-out defect). “Defect size (S)” is to detect a defect size of 130 μm or more and less than 170 μm. “Defect size (M)” is to detect a defect size of 170 μm or more and less than 200 μm. “Defect size (L)” is to detect a defect size of 200 μm or more.
In each of the comparative example and the example, a crossed Nicol permeation test was performed. In each of the comparative example and the example, the resolution (X * Y), threshold value (black, white), defect size (S, M, L), and camera filter (polarization filter) were set to the same conditions.

(Comparative example)
In the comparative example, the conveyance speed of the bonding sheet F5 was 16 m / min. The number of cycles was 24000. The comparative example does not use a bifurcated optical fiber cable.
(Example)
In an Example, the conveyance speed of the bonding sheet | seat F5 was 20 m / min. The number of cycles was 14400. A bifurcated optical fiber cable was used. Two branched optical fiber cables were connected to one end and the other end in the longitudinal direction of the light guide member one by one.

  Table 4 shows measured values of the amount of light received by the camera before the crossed Nicols transmission test for each of the comparative example and the example.

  In Table 4, the camera No. (1) to (9) correspond to each of the plurality of cameras arranged in a line along the sheet width direction, and the plurality of cameras (the first camera 24a, the second camera 24b, and the third camera 24c described above). , A fourth camera 24d, a fifth camera 24e, a sixth camera 24f, a seventh camera 24g, an eighth camera 24h, and a ninth camera 24i).

  As shown in Table 4, there was no significant difference in the measured value of the received light amount of the camera before the crossed Nicol transmission inspection between the comparative example and the example.

(Evaluation of the number of detected defects)
The number of detected defects was evaluated for each of the comparative example and the example. Using the review software, the number of black defects, the black defect rate, the number of white defects, and the white defect rate were measured. As review software, “SCANTEC” manufactured by Nagase Sangyo Co., Ltd. was used.
Here, the “number of defects (S)” is the number of detected defects having a defect size of 130 μm or more and less than 170 μm. “Defect number (M)” is the number of defects detected with a defect size of 170 μm or more and less than 200 μm. “Defect number (L)” is the number of detected defects having a defect size of 200 μm or more.

  The results are shown in Table 5 for the above evaluation. The upper part of Table 5 is the result in the sheet conveyance forward direction (forward direction U1 shown in FIG. 13), and the lower part of Table 5 is the result in the sheet conveyance reverse direction (reverse direction U2 shown in FIG. 13).

  As a result of the evaluation, a large difference in the number of detected defects was not confirmed between the comparative example and the example in each of the forward direction U1 and the reverse direction U2. Thereby, even if the conveyance speed of the bonding sheet | seat was made quick by using a 2 branch optical fiber cable, it turned out that the fall of a detection sensitivity can be suppressed.

(Evaluation of defect detection sensitivity)
The defect detection sensitivity was evaluated for each of the comparative example and the example. Using the review software, the X defect size, the number of X pixels, the Y defect size, the number of Y pixels, the maximum density value, the minimum density value, and the number of defective pixels were measured. As review software, “SCANTEC” manufactured by Nagase Sangyo Co., Ltd. was used.
For the number of X pixels, the number of Y pixels, the maximum density value, and the number of defective pixels, the change rate ((D2 / D1) × 100) [%] of the result D2 of the example with respect to the result D1 of the comparative example was obtained.
Here, the “X defect size” is the size of the defect detected in the X direction. The “number of X pixels” is the number of defective pixels detected in the X direction. “Y defect size” is the size of a defect detected in the Y direction. “Y pixel count”. This is the number of defective pixels detected in the Y direction. The “maximum density value” is the maximum density value in the defect area. The “minimum density value” is the minimum density value in the defect area. The “number of defective pixels” is the number of defective pixels exceeding the threshold.

  Samples A to G were used as evaluation targets. Samples A to G are scratches mainly attached to the film surface as pseudo defects.

About the said evaluation, a result is shown in FIGS.
FIG. 14 is a diagram comparing the number of X pixels in each sample for the comparative example and the example.
FIG. 15 is a diagram comparing the number of Y pixels in each sample for the comparative example and the example.
FIG. 16 is a diagram comparing the maximum density values in the respective samples for the comparative example and the example.
FIG. 17 is a diagram comparing the number of defective pixels in each sample for the comparative example and the example.
FIG. 18 is a diagram comparing the number of X pixels, the number of Y pixels, the maximum density value, and the number of defective pixels in the comparative example and the example.
14 to 17, the horizontal axis represents the type of sample. In FIGS. 14, 15 and 17, the vertical axis represents the number of pixels. In FIG. 16, the vertical axis represents the density value. In FIG. 18, a comparative example is used as a reference (comparative example = 100 [%]).

  As a result of the evaluation, no significant difference was confirmed in each of the number of X pixels, the number of Y pixels, the maximum density value, and the number of defective pixels between the comparative example and the example. Thereby, even if the conveyance speed of the bonding sheet | seat was made quick by using a 2 branch optical fiber cable, it turned out that the fall of a detection sensitivity can be suppressed.

DESCRIPTION OF SYMBOLS 1 ... Film bonding system (production system of an optical display device), 8 ... 1st conveying apparatus (conveying apparatus), 9 ... 1st defect inspection apparatus (defect inspection apparatus), 11 ... 1st bonding apparatus (bonding apparatus) ), 20 illuminating device, 21 light source, 22 bifurcated optical fiber cable (multiple branched optical fiber cable), 23 light guide member, 24 imaging device, P liquid crystal panel (optical display component), F1 optical member, Sf1... Lower surface (surface on one side of optical member), Sf2... Upper surface (surface on the other side of optical member)

Claims (2)

A defect inspection apparatus for optical members conveyed on a line,
A lighting device disposed on one side of the optical member;
An imaging device disposed on the other side of the optical member,
The lighting device includes:
A plurality of light sources having equal spectral distribution characteristics;
A multi-branch optical fiber cable having a branching unit corresponding to each of the plurality of light sources, and transmitting the light from the light sources connected to each branching unit in one,
A light guide member that guides light from the plurality of light sources transmitted by the plurality of branched optical fiber cables and emits the light toward one surface of the optical member, and
The imaging device captures an image of light emitted from the light guide member and transmitted through the optical member,
The light guide member is disposed in parallel with a surface on one side of the optical member and extends in a direction perpendicular to the transport direction of the optical member, and extends.
Two branch optical fiber cables are connected one by one as the multi-branch optical fiber cable to one end and the other end in the longitudinal direction of the light guide member ,
The imaging apparatus is a defect inspection apparatus having a spectral sensitivity characteristic that maximizes spectral sensitivity at a wavelength that matches a peak wavelength at which a relative light output of the spectral distribution characteristic is maximized . An optical display device production system in which an optical member is bonded to an optical display component,
A transport device for transporting the optical member;
A bonding apparatus for manufacturing the optical display device by bonding the optical member conveyed by the conveyance apparatus to the optical display component;
The defect inspection device according to claim 1 , wherein the presence or absence of a defect of the optical member conveyed from the conveyance device to the bonding device is inspected.
Optical display device production system including.

Images