JP2011007779A - Defect marking device for film, and defect marking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defect marking device for a film and a defect marking method capable of reducing man-hours for visual inspection without lowering yield by improving greatly marking accuracy on a defect position in comparison with a conventional technology, and by marking on a fine defect itself.SOLUTION: This defect marking device for the film includes first detection means 16, 28 for detecting a meandering amount which is a deviation in a width direction of a defect part from detection of a defect in an inspection area 37 until marking on a marking area 38, second detection means 17, 21, 23, 29 for detecting a conveyance distance of the defect part from detection of the defect in the inspection area 37 until marking on the marking area 38, and a means 25 for determining a marking position by correcting a coordinate of the defect part in the marking area 38 based on the first and second detection means.

Description

  The present invention relates to a defect marking apparatus for a film for detecting a defect in a film (sheet) and marking the defective part, and a method for marking such a defect.

  With the recent development of photolithography technology, it has become possible to form a fine structure pattern having a pitch at the wavelength level of light. Such a member or product having a pattern with a very narrow pitch is useful not only in the semiconductor field but also in the optical field.

  For example, a linear metal wire that is parallel to the substrate and formed at specific intervals (periods) is a diffraction grating if the period is larger than the wavelength of incident light, for example, visible light, 400 nm to 700 nm. On the other hand, if the period is considerably smaller than the wavelength of visible light, for example, about ½ or less, the metal wire reflects almost the electric field vector component that oscillates parallel to the metal line, and the vertical electric field Since most of the vector component is transmitted, it can be used as a polarizing element that produces a single polarized light. In fact, such metal wires are used as wire grid polarizers (also referred to as wire grid polarizers) for purposes such as various liquid crystal display devices, polarization beam splitters, polarization reflectors, and optical isolators. The wire grid polarizing plate is desirable from the viewpoint of effective use of light because light that does not pass through can be reused by using a reflector or the like.

  Specifically, such a wire grid polarizing plate (polarizing film) includes a resin base material having a lattice-like convex portion on the surface, and a dielectric formed on a region including the lattice-like convex portion of the resin base material. Layer and a metal wire layer formed on the grid-shaped convex portion covered with the dielectric layer, and is formed as a sheet-like product to be collected in a roll shape, and cut into a predetermined length and used. The

  By the way, in a sheet-like product such as a wire grid polarizing film, it is required to increase the detection accuracy for detecting defects in the product and increase the yield. Actually, conventionally, in the manufacturing process of long sheet-shaped products such as synthetic resin films and sheets, defects are automatically detected by the inspection device in the process of transporting sheet-shaped products, and downstream in the transport direction. , The detected defect part is marked, and the defect part is removed or repaired for the purpose of marking in the subsequent process, and many defect marking devices used in such a process have been proposed. (For example, see Patent Documents 1 to 6).

JP 2006-038778 A JP 2006-108473 A JP 2006-194721 A JP 2006-266981 A JP 2007-114138 A JP 2007-114139 A

  However, the conventional precision defect marking apparatus cannot accurately perform defect marking on a film or sheet, and there is a problem that the yield decreases due to the marking. For example, in the detection of defects on a wire grid polarizing film, with the conventional marking accuracy, the defective portion and the marking portion are misaligned, so that a normal portion near the defect is marked, and the originally usable portion becomes a defective portion. As a result, there was a situation where the yield dropped.

  In addition, there is also a problem that it takes time to check the defective portion when the detection of the defective portion of the film in which the defect on the order of μm is a problem, such as optical related and electronic material related. For example, in the detection of minute defects in a wire grid polarizing film, it takes a lot of man-hours to confirm the minute defects.

  The present invention has been made in view of the above points, and a film capable of reducing the number of visual inspection steps without lowering the yield by dramatically improving the marking accuracy at the defect position as compared with the prior art. It is an object to provide a defect marking apparatus and a defect marking method.

  The defect marking apparatus for a film of the present invention detects a defective portion of a long film continuously conveyed in the length direction in an inspection area and is detected in a marking area downstream of the inspection area in the conveyance direction. A film defect marking apparatus for marking a defective portion, wherein a meandering amount, which is a deviation in a width direction of the defective portion from when a defect is detected in an inspection area until marking is performed in the marking area, is detected. First detection means; second detection means for detecting a conveyance distance of the defective portion from when a defect is detected in the inspection area until marking is performed in the marking area; and the first and second detections Means for correcting the coordinates of the defective portion in the marking area based on the means and determining the marking position.

  In the defect marking method of the present invention, a defect portion of a long film continuously conveyed in the length direction is detected in the inspection area, and the detected defect is detected in the marking area downstream in the conveyance direction from the inspection area. A defect marking method for a film in which marking is performed on a portion, wherein a first amount of meandering, which is a deviation in a width direction of the defective portion from when a defect is detected in an inspection area until marking is performed in the marking area, is detected first Detecting by means, detecting by second detecting means for detecting a transport distance of the defective portion from when a defect is detected in the inspection area until marking is performed in the marking area, and Correcting the coordinates of the defective portion in the marking area based on the second detection means and determining the marking position; Characterized in that it contains.

  Thus, according to the present invention, since the meandering amount and the conveyance distance are detected and the marking coordinates are corrected, the marking accuracy is remarkably improved as compared with the conventional art.

  According to the present invention, it is possible for a film that can reduce the number of visual inspection steps by marking a minute defect itself without significantly reducing the yield by dramatically improving the marking accuracy at the defect position as compared with the prior art. A defect marking device and a defect marking method can be provided.

It is a schematic block diagram of the defect marking apparatus for wire grid polarizing films which concerns on one embodiment of this invention. (A) is the schematic which looked at the defect inspection area to the conveyance direction, (b) is the top view which looked at the defect inspection area from the upper direction. (A) is the schematic which looked at the marking area in the conveyance direction, (b) is the top view which looked at the marking area from the upper direction.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The defect marking apparatus for a film according to the present invention detects a defective portion of a long film continuously conveyed in the length direction in an inspection area, and detects it in a marking area downstream in the conveyance direction from the inspection area. It is a defect marking device for film which marks a defective part made.

  The defect marking apparatus for a film according to the present invention can be used for defect detection of any film, but in particular for defect detection of a film in which a fine structure pattern such as a wire grid polarizer is formed among optical films. When used, it is considered that a further effect is exhibited.

  In general, the finer the structural pattern, the greater the number of defects.Thus, when the defect marking device for a film according to the present invention is used for defect detection of a film on which a fine structure pattern is formed, the yield is also as follows. It is thought that it will improve further.

  The fine structure pattern refers to a fine structure pattern having a pitch equal to or lower than the visible light wavelength level, and specifically refers to an uneven lattice shape having a pitch distance of 700 nm or less. In particular, when the thickness is 1 nm to 200 nm, it is considered that the effect of improving the yield is great.

  In addition, it is preferable for handling that the thickness of the optical film is 300 μm or less. However, the thinner the film, the easier it is to meander during film transportation. In particular, it is considered that a film with a thickness of 100 μm or less or 80 μm or less exhibits further effects. These optical film base materials are preferably optically transparent resin base materials, and examples thereof include PET, COP, and TAC.

Here, the film defect marking apparatus is provided with the following 1-3.
1 a first detecting means for detecting a meandering amount which is a deviation in a width direction of the defective portion from when a defect is detected in the inspection area until marking is performed in the marking area;
2nd detection means for detecting a conveyance distance of the defective portion from when a defect is detected in the inspection area until marking is performed in the marking area;
3 A means for determining a marking position by correcting coordinates of a defective portion in a marking area based on the first and second detection means.

  Here, by using the first detection means, the second detection means, and the means for determining the marking position by correcting the coordinates of the defect portion (hereinafter, also referred to as “control means”), the defect position is determined. Marking accuracy can be dramatically improved, and yield reduction can be suppressed. Furthermore, the number of visual inspection steps can be reduced.

  Among them, as the second detection means, means for subdividing the film, detecting each boundary for each subdivided film (sheet), and measuring the distance from each boundary to increase the length measurement accuracy is used. It is preferable from the viewpoint of improving measurement accuracy.

  Devices related to the first detection means and the second detection means are scattered in the inspection area and the marking area.

  As equipment relating to the first detection means, there is a defect inspection area displacement meter in the inspection area, and a marking area displacement meter in the marking area.

  As equipment relating to the second detection means, there is a defect inspection area laser sensor in the inspection area, and a marking area laser sensor in the marking area.

  As control means, a drive control programmable logic controller (hereinafter referred to as “drive control PLC”), a defect inspection programmable logic controller (hereinafter referred to as “defect inspection PLC”), and a system control programmable logic controller (hereinafter referred to as “system”). Control PLC "), the laser marking position is determined by these control means, and the marking position information is sent to a personal computer for laser marking control (hereinafter referred to as" laser marking control PC ").

Next, the actual marking process will be described with reference to the drawings.
FIG. 1 is a schematic view of a defect marking apparatus for a wire grid polarizing film according to an embodiment of the present invention. The defect marking apparatus according to the present embodiment inspects the raw roll 41 on which the wire grid polarizing film 11 is wound.

  The conveyance speed of the film is controlled by the drive control PLC 21 with the number of rotations of the S-shaped roll. The drive control PLC 21 also controls tension, accumulation, and the like. As shown in FIGS. 2 and 3, in the longitudinal direction of the wire grid polarizing film 11, conveyance direction coordinate marks 12 having a constant width direction and a constant flow direction are provided at equal intervals.

  This one interval is defined as one unit (sheet 13), and is cut into sheets in a subsequent process. In addition, it is preferable to attach a protective film to the grid surface immediately before the wire grid polarizing film 11 is unrolled and / or just before winding, because it is possible to prevent the wire grid polarizing film 11 from being scratched or adhering to dust. Further, the protective film attached before the wire grid polarizing film 11 is unwound is peeled off simultaneously with the unwinding of the raw roll 41, and the protective film attached before the wire grid polarizing film 11 is wound is simultaneously attached with the winding of the inspected roll 42. Used in

Next, the inspection area will be described.
The wire grid polarizing film 11 from the original fabric roll 41 is drawn out by the S-shaped roll 1 (39), and first enters the defect inspection area 37. Here, the tension when pulling out is preferably 88 gf / mm ² or more and 354 gf / mm ² or less. If the tension is 88 gf / mm ² or more, the film does not sag and no coordinate shift occurs. If it is 354 gf / mm < ² > or less, the generation | occurrence | production of the defect by the contact of a roll and a product will not arise. In addition, it is preferable to use an S-shaped roll because it can suppress slipping and displacement of the film during conveyance and improve the accuracy of marking. As shown in FIGS. 1 and 2, the line sensor camera 14 is provided above the wire grid polarizing film 11 in the defect inspection area 37, and the light source 15 is installed directly below the line sensor camera 14. . Upstream from the line sensor camera 14 and the light source 15, a defect inspection area displacement meter 16 (first detection means) (for example, LS7000 manufactured by Keyence Corporation) for detecting the film edge portion of the wire grid polarizing film 11 is conveyed. A defect inspection area laser sensor 17 (second detection means) (for example, LV-H300 manufactured by Keyence Corporation) for detecting a direction coordinate mark is provided. The defect inspection area displacement meter 16 (first detection means) includes a displacement meter light source unit 19 that projects parallel light 18 having a width of 30 mm and a displacement meter light receiving unit 20. The edge measurement accuracy of the defect inspection area displacement meter 16 (first detection means) is ± 2 μm.

  In the inspection area, the defect detection position is determined by the defect inspection PLC 23, and information on the marking position is sent to the laser marking control PC 33 (to be described later) by the system control PLC 25 that integrates the drive control PLC 21 and the defect inspection PLC 23. Yes. The defect inspection area laser sensor 17 (second detection means) includes a laser sensor light projecting unit 17a that projects light in an irradiation area of 30 mm × 0.4 mm (film width direction × film transport direction), a laser sensor light receiving unit 17b, Consists of. An ON signal is sent from the defect inspection PLC 23 to the system control PLC 25 almost simultaneously with the conveyance direction coordinate mark 12 passing through this irradiation area.

  The accumulator 26 is provided downstream of the line sensor camera 14 and the light source 15, the defect inspection area 37 upstream of the accumulator 26 is continuously operated, and the wire grid polarizing film is used in the marking area 38 downstream of the accumulator 26 during laser marking. 11 is stopped, and as soon as marking is completed, it is conveyed in an intermittent operation that starts conveyance. The driving speed and transport distance of the film in the marking area 38 are controlled by the S-shaped roll 2 (40). Here, while conveying the film with the S-shaped roll and providing the accumulator 26, the defective portion can be stopped at the marking position in the marking area 38 without interrupting the conveyance flow in the longitudinal direction of the film. It is preferable because deviation during film conveyance can be suppressed and marking accuracy can be improved.

Next, the marking area will be described.
A laser marker 27 for defect marking (for example, MD-V7100 manufactured by Keyence Corporation) is provided downstream of the accumulator 26. As shown in FIGS. 1 and 3, upstream of the laser marker 27, a marking area displacement meter 28 (for example, LS7000 manufactured by Keyence Corporation) for detecting the film edge of the wire grid polarizing film 11 (first detection) Means) and a marking area laser sensor 29 (second detecting means) (for example, LV-H300 manufactured by Keyence Corporation) for detecting the conveyance direction coordinate mark. The marking area displacement meter 28 (first detection means) includes a displacement meter light source unit 31 that projects parallel light 30 having a width of 30 mm and a displacement meter light receiving unit 32. The edge measurement accuracy of the marking area displacement meter 28 (first detection means) is ± 2 μm.

  The marking area laser sensor 29 (second detection means) includes a laser sensor light projecting unit 29a that projects light in an irradiation area of 30 mm × 0.4 mm (film width direction × film transport direction), and a laser sensor light receiving unit 29b. Become. An ON signal is sent from the marking area laser sensor 29 (second detection means) to the system control PLC 25 almost simultaneously with the conveyance direction coordinate mark 12 passing through this irradiation area. The distance L2 until the center 36 of the sheet 13 reaches the center 35 of the marking area of the laser marker 27 is measured immediately after the system control PLC 25 receives the ON signal, and the distance becomes L2. At the instant (the moment when the sheet center 36 reaches the center 35 of the marking area of the laser marker), film accumulation by the accumulator 26 is started, and the film is controlled to stop in the intermittent operation zone. Further, the overshoot amount (ΔY) due to inertial running until the film completely stops is measured by a pulse generator, and stored in the system control PLC 25 for correcting the positional deviation of the marking in the transport direction.

  Subsequently, the coordinates Xn of the defect inspection area 37 will be described. The coordinate Xn in the width direction of the wire grid polarizing film 11 of the defect 24 detected by the line sensor camera 14 is from the film edge position 22 of each sheet recognized by the defect inspection area displacement meter 16 (first detection means). Defined by distance.

  Next, the coordinate Yn in the transport direction will be described. Since the system control PLC 25 receives the ON signal from the defect inspection area laser sensor 17 (second detection means), the coordinate at the moment when the conveyance distance measured by the pulse generator becomes L1 is set to 0. The transport distance from when the defect is detected to Yn is defined as Yn. The coordinate Yn in the conveyance direction is reset at the moment when the conveyance distance measured by the pulse generator becomes L1 after the system control PLC 25 receives the ON signal, and is set to the coordinate 0 (origin) of the next sheet. Return.

  The coordinates of the defect obtained as described above are stored for each sheet. In addition, a non-transparent part is a part without a resin unevenness | corrugation for a certain reason here. If there are no resin irregularities, the portion where aluminum (metal wire layer) is deposited becomes a simple solid film (planar film) and does not transmit light.

  The marking coordinates (Xn ′, Yn ′) in the marking area 38 in the width direction and the flow direction for laser marking at the position of the defined defect coordinates (Xn, Yn) will be described.

  Regarding the X coordinate, a meandering deviation (widthwise deviation; meandering amount) (ΔX) generated during conveyance from the defect inspection area 37 to the marking area 38 is detected by the defect inspection area displacement meter 16 (first detection means). It is calculated in the system control PLC 25 from the detected coordinates of the edge position 22 and the coordinates of the edge position 34 detected by the marking area displacement meter 28 (first detection means), and the coordinates in the defect inspection area 37 are corrected. And stored in the system control PLC 25. Regarding the marking in the conveyance direction, the overshoot amount (ΔY) due to inertial traveling at the time of intermittent operation stop measured by the method described above is also stored in the system control PLC 25. That is, the coordinates (Xn ′, Yn ′) of the laser irradiation position in the marking area 38 are recalculated as (Xn + ΔX, Yn + ΔY) in the system control PLC 25 and sent to the laser marking control PC 33.

  As described above, the coordinates of the laser irradiation position can be accurately determined by the first detection unit and the second detection unit.

  Laser marking burns off the aluminum on the wire grid polarizing film, but does not damage the film. The wavelength of the laser is appropriately selected depending on the material to be marked, but it is preferable to use a YAG laser having a laser wavelength of 1064 nm. Aluminum absorbs about 10% of light with a wavelength of 1064 nm, whereas TAC (triacetyl cellulose) used as a substrate for a wire grid polarizing film and UV curable resin forming fine irregularities are Since there is no absorption, only aluminum absorbs light and is burned off.

On the other hand, if a CO ₂ laser with a wavelength of 10.6 μm is used, since TAC and UV curable resin also absorb, the film is perforated (penetrated) by laser irradiation, increasing the amount of dust generation and Cause deformation.

  After the laser marking of one sheet is completed, the conveyance of the wire grid polarizing film 11 is resumed by the S-shaped roll 2 (40) in the marking area 38, and stops when the next sheet center 36 reaches the center 35 of the marking area. Let

  After the defect inspection and the laser marking are performed as described above and the wound inspected roll 42 is cut for each sheet, it is bonded to a transparent PET film having an adhesive layer on the surface, and further the wire on the PET film Half-cut so that only the grid polarizing film 11 is cut (this sheet is also referred to as “piece”).

  After half-cutting, a visual inspection is performed, and a work of marking “x” marks on the laser-marked piece with a magic pen is performed.

Subsequently, other devices that may be mounted will be described below.
The marking area 38 is preferably provided with a dust collector that collects dust generated by laser marking, and a dust collector is provided in such a manner that the vicinity of the material to be marked is divided by a small box and the inside of the box is sucked. Is more preferable. Moreover, it is preferable that the material of rolls, such as an S-shaped roll which contacts a wire grid surface, is rubber | gum. Further, a transmittance monitor for checking the optical characteristics of the wire grid polarizing film 11 for each sheet may be provided between the inspected roll 42 and the marking area 38. Further, an ink jet printer that prints a product number or the like may be provided at an arbitrary place between the original fabric roll 41 and the inspected roll 42.

Hereinafter, based on an Example, this invention is demonstrated concretely.
Example 1
The defect marking apparatus according to the present embodiment inspected the raw fabric roll 41 on which the wire grid polarizing film 11 having a width of 230 mm, a thickness of 80 μm, and a length of 250 m was wound.

  As shown in FIGS. 2 and 3, in the longitudinal direction of the wire grid polarizing film 11, conveyance direction coordinate marks 12 having a width direction of 50 mm and a flow direction of 1.5 mm are provided at intervals of about 260 mm.

  Here, this 260 mm was made into 1 unit (sheet | seat 13), and it cut | judged into the sheet | seat in the post process. Also, the protective film attached before the wire grid polarizing film 11 is unwound is peeled off simultaneously with the unwinding of the original roll 41, and the protective film attached before the wire grid polarizing film 11 is wound is attached simultaneously with the winding of the inspected roll 42. Used in.

-Inspection area The wire grid polarizing film 11 from the raw fabric roll 41 was pulled out by the S-shaped roll 1 (39) and first put in the defect inspection area 37. Here, the tension when pulling out was 222 gf / mm ² . As shown in FIGS. 1 and 2, the line sensor camera 14 is provided above the wire grid polarizing film 11 in the defect inspection area 37, and the light source 15 is installed directly below the line sensor camera 14. 200 mm upstream of the line sensor camera 14 and the light source 15, a defect inspection area displacement meter 16 (first detection means) (LS7000 manufactured by Keyence Corporation) for detecting the film edge of the wire grid polarizing film 11, and a conveyance direction coordinate mark A defect inspection area laser sensor 17 for detection (second detection means) (LV-H300 manufactured by Keyence Corporation) was provided.

  The laser irradiation area of the defect inspection area laser sensor 17 (second detection means) is 30 mm × 0.4 mm (film width direction × film conveyance direction), and almost simultaneously with the conveyance direction coordinate mark 12 passing through this irradiation area. An ON signal was sent from the defect inspection PLC 23 to the system control PLC 25. The distance L1 from the irradiation area of the defect inspection area laser sensor 17 (second detection means) to the imaging point of the line sensor camera 14 was 182.517 mm.

  The accumulator 26 was provided about 500 mm downstream from the line sensor camera 14 and the light source 15, and the defect inspection area 37 upstream from the accumulator 26 was continuously operated at 0.5 m / min. In the marking area 38 downstream of the accumulator 26, the wire grid polarizing film 11 was stopped at the time of laser marking, and transported by intermittent operation to start transporting as soon as marking was completed. The driving speed and transport distance of the film in the marking area 38 were controlled by the S-shaped roll 2 (40).

Marking area A laser marker 27 (MD-V7100 manufactured by Keyence Corporation) for defect marking was provided about 500 mm downstream from the accumulator 26. As shown in FIGS. 1 and 3, about 300 mm upstream from the laser marker 27, a marking area displacement meter 28 (LS7000 manufactured by Keyence Corporation) for detecting the film edge of the wire grid polarizing film (first detection means) And a marking area laser sensor 29 (second detection means) (LV-H300 manufactured by Keyence Corporation) for detecting the conveyance direction coordinate mark.

  The laser irradiation area of the marking area laser sensor 29 (second detection means) is 30 mm × 0.4 mm (film width direction × film conveyance direction), and almost simultaneously with the conveyance direction coordinate mark 12 passing through this irradiation area, An ON signal was sent from the marking area laser sensor 29 (second detection means) to the system control PLC 25. The distance L2 until the center 36 of the sheet 13 reaches the center 35 of the marking area of the laser marker 27 is 294.500 mm, and the distance measurement starts immediately after the system control PLC 25 receives the ON signal. The film accumulation by the accumulator 26 was started at the moment of L2 (the moment when the sheet center 36 reached the center 35 of the marking area of the laser marker), and the film was controlled to stop in the intermittent operation zone. Further, the overshoot amount (ΔY) due to inertial running until the film completely stopped was measured by a pulse generator, and stored in the system control PLC 25 for correcting the positional deviation of the marking in the transport direction.

-Coordinates of defect inspection area Subsequently, the coordinates Xn of the defect inspection area 37 will be described.
A coordinate Xn in the width direction of the wire grid polarizing film 11 of the defect 24 detected by the line sensor camera 14 is a distance from the film edge position 22 of each sheet recognized by the defect inspection area displacement meter 16 (first detection means). Stipulated in

Next, the coordinate Yn in the transport direction will be described.
Since the system control PLC 25 receives the ON signal from the defect inspection area laser sensor 17 (second detection means), the coordinate at the moment when the conveyance distance measured by the pulse generator becomes L1 is set to 0. The transport distance from when the defect is detected to Yn is defined as Yn.

  The coordinates of the defect obtained as described above were stored for each sheet. In the present embodiment, a non-transparent portion having a diameter of 80 μm or more is defined as a defect.

Marking Coordinates Marking coordinates (Xn ′, Yn ′) in the marking area 38 in the width direction and the flow direction for laser marking at the position of the defect coordinates (Xn, Yn) defined as described above will be described.

  Regarding the X coordinate, a meandering deviation (widthwise deviation; meandering amount) (ΔX) generated during conveyance from the defect inspection area 37 to the marking area 38 is detected by the defect inspection area displacement meter 16 (first detection means). It is calculated in the system control PLC 25 from the detected coordinates of the edge position 22 and the coordinates of the edge position 34 detected by the marking area displacement meter 28 (first detection means), and the coordinates in the defect inspection area 37 are corrected. And stored in the system control PLC 25. Regarding the marking in the conveyance direction, the overshoot amount (ΔY) due to inertial running at the time of intermittent operation stop measured by the method described above was also stored in the system control PLC 25. That is, the coordinates (Xn ′, Yn ′) of the laser irradiation position in the marking area 38 are recalculated as (Xn + ΔX, Yn + ΔY) in the system control PLC 25 and sent to the laser marking control PC 33.

  The marking shape was a circular fill with a radius of 0.5 mm around the defect. For the laser wavelength, a 1064 nm YAG laser was used. TAC was used for the substrate of the wire grid polarizing film.

  After the laser marking of one sheet is completed, the conveyance of the wire grid polarizing film 11 is resumed by the S-shaped roll 2 (40) in the marking area 38, and stops when the next sheet center 36 reaches the center 35 of the marking area. I let you.

  After the defect inspection and the laser marking are performed as described above and the wound inspected roll 42 is cut for each sheet, it is bonded to a transparent PET film having an adhesive layer on the surface, and further the wire on the PET film Half cut was performed to a size of 10 mm × 10 mm so that only the grid polarizing film 11 was cut.

  When the sheet after laser marking was visually confirmed, no non-transparent part (defect) of φ80 μm or more was found on the sheet, and it was found that all defects were burned off by the laser marker.

  After half-cutting, a visual inspection was performed, and an operation of writing a mark “x” on a laser-marked piece with a magic pen was performed. The time required for the operation was about 3 minutes per sheet. Moreover, the yield of the piece calculated by (number of pieces not laser-marked) / (total number of pieces) × 100 (%) after the half cut was 88%.

(Example 2)
It implemented by the method similar to Example 1 except having replaced both the S-shaped roll 1 (39) and S-shaped roll 2 (40) used in Example 1 with the nip roll. As a result, when the sheet after laser marking was visually confirmed, there were about two non-transparent portions (defects) of φ80 μm or more per 10 pieces of 10 mm × 10 mm on the sheet, with a radius of 0 on the side. A trace of 5 mm laser marking was confirmed. That is, in Example 2, it was found that an error of 200 μm at the maximum occurred between the defect position and the marking position. The piece yield was 72%.

  In addition, after half-cutting, visual inspection was performed, and the work for marking “×” marks on the laser-marked pieces with a magic pen was performed. The time required for the work was about 5 minutes per sheet. It was.

(Example 3)
Example 1 was carried out in the same manner as in Example 1 except that the film pass line was changed so that continuous operation was also performed in the marking area without using an accumulator. As a result, when the sheet after laser marking was visually confirmed, there were about three non-transparent portions (defects) of φ80 μm or more per 10 pieces of 10 mm × 10 mm on the sheet, with a radius of 0 on the side. A trace of 5 mm laser marking was confirmed. That is, in Example 2, it was found that an error of 200 μm at the maximum occurred between the defect position and the marking position. The yield of pieces was 67%.

  In addition, after half-cutting, visual inspection was performed, and the work for marking “×” marks on the laser-marked pieces with a magic pen was performed. The time required for the work was about 5 minutes per sheet. It was.

(Comparative Example 1)
When the same marking was performed without using the displacement meter (first detection means) for detecting the film edge and the laser sensor (second detection means) for detecting the mark in the conveyance direction, on the sheet, Non-transparent portions (defects) having a diameter of 80 μm or more were present everywhere, and a laser marking trace having a radius of 0.5 mm was confirmed on the side. That is, in Comparative Example 1, it was found that an error of 500 μm at the maximum occurred between the defect position and the marking position. The piece yield was 39%.

  In addition, after half-cutting, visual inspection was performed, and the work marked with “X” was written on the laser-marked piece with a magic pen. The time required for the work was about 20 minutes per sheet. Cost.

  That is, it was found that the time required for visual inspection can be shortened to about 1/7 by defect emphasis by laser marking.

  As described above, according to the defect marking device for wire grid polarizing film and the defect marking method according to the present embodiment, since the meandering amount and the conveyance distance are detected and the marking coordinates are corrected, the marking accuracy is improved. However, it will be much better than before. That is, the marking accuracy at the defect position is dramatically improved as compared with the prior art, and the number of visual inspection steps can be reduced by marking.

  Further, in the present embodiment, by performing intermittent operation by the accumulator 26, marking deviation can be reduced and marking accuracy can be improved. In the present embodiment, by using the S-shaped roll 1 (39) and the S-shaped roll 2 (40), it is possible to reduce slippage and improve the marking accuracy. Furthermore, in the present embodiment, a long scroll can be obtained by supporting the accumulator 26 and S-shaped rolls 39 and 40, driving the film, correcting the coordinates of the defective portion, and providing the transport direction coordinate mark 12. The sheet can be subdivided and handled in units of sheets, thereby improving the accuracy of coordinate correction in the flow direction.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is not limited to the description of the embodiment described above, but is shown by the scope of claims, and is not limited to a wire grid polarizing film, but is related to optical grids, electronic materials, etc. It is intended to cover all films in which the above-mentioned drawbacks are a problem, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 11 Wire grid polarizing film 12 Conveyance direction coordinate mark 13 Sheet | seat 14 Line sensor camera 15 Light source 16 Defect inspection area displacement meter (1st detection means)
17 Defect inspection area laser sensor (second detection means)
17a Laser sensor light projecting part 17b Laser sensor light receiving part 18 Parallel light 19 Displacement light source part 20 Displacement light receiving part 21 Drive control PLC
22 Edge position (inspection area X coordinate origin)
23 Defect inspection PLC
24 Defect 25 System Control PLC
26 Accumulator 27 Laser marker 28 Marking area displacement meter (first detection means)
29 Marking area laser sensor (second detection means)
29a Laser sensor light emitting unit 29b Laser sensor light receiving unit 30 Parallel light 31 Displacement light source unit 32 Displacement light receiving unit 33 Laser marking control PC
34 Edge position 35 Marking area center point 36 Sheet center 37 Defect inspection area 38 Marking area 39 S-shaped roll 1
40 S-roll 2
41 Raw roll 42 Inspected roll

Claims (10)

  A defect for a film in which a defect portion of a long film continuously conveyed in the length direction is detected in an inspection area, and the detected defect portion is marked in a marking area downstream in the conveyance direction from the inspection area. A first detecting means for detecting a meandering amount which is a deviation in a width direction of the defective portion from when a defect is detected in the inspection area until marking is performed in the marking area; A second detection means for detecting a conveyance distance of the defective portion from when the defect is detected until marking is performed in the marking area; and a defect portion in the marking area based on the first and second detection means. Means for determining a marking position by correcting coordinates, and a defect marking device for a film.   By supporting the film to be transported and accumulating the film so that the film is intermittently transported in the marking area, the defective portion can be detected at the marking position in the marking area without interrupting the transport flow in the longitudinal direction of the film. The film defect marking apparatus according to claim 1, further comprising an accumulator to be stopped.   The film defect marking apparatus according to claim 1 or 2, wherein the film is driven by an S-shaped roll.   The film is provided with marks to be detected by the detecting means at predetermined intervals along the length direction, and the film is cut into sheets after the inspection as a unit. The defect marking device for a film according to any one of claims 1 to 3.   The film defect marking device according to any one of claims 1 to 4, wherein the film defect marking device is for a wire grid polarizing film.   A defect in a film that detects a defective portion of a long film continuously conveyed in the length direction in an inspection area, and marks the detected defective portion in a marking area downstream of the inspection area in the conveyance direction. A marking method, wherein a first meander detects a meandering amount which is a deviation in a width direction of the defective portion from when a defect is detected in the inspection area until marking is performed in the marking area; A step of detecting by a second detection means for detecting a conveyance distance of the defective portion from when a defect is detected in the area until marking is performed in the marking area; and based on the first and second detection means Correcting the coordinates of the defective portion in the marking area to determine the marking position, Packaging method.   By accumulating the film so that the film is intermittently conveyed in the marking area using an accumulator that supports the film to be conveyed, the film can be conveyed at the marking position in the marking area without interrupting the conveyance flow in the longitudinal direction of the film. The defect marking method according to claim 6, further comprising a step of stopping the defective portion.   The defect marking method according to claim 6 or 7, wherein the film is driven by an S-shaped roll.   The defect marking method according to claim 6, wherein the film to be conveyed is a wire grid polarizing film.   A film sheet on which a defect is detected and marked by the defect marking device for a film according to any one of claims 1 to 5, wherein the detection means detects the film sheet at a predetermined interval along its length. A film sheet, characterized by being provided with a target mark, and being cut into sheets after the inspection as a unit.

Images