JP2011237223A - Inspection method for transparent laminate and transparent laminate subjected to the inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inspect a transparent laminate having a second transparent body on a first transparent body with high accuracy whether or not the second transparent body is laid at a predetermined position of the first transparent body.SOLUTION: An inspection method for a transparent laminate having a first transparent body and a second transparent body laid on a face in one side of the first transparent body is provided, the method comprising: an imaging step of imaging an outer circumference edge of the transparent laminate by use of imaging means approximately downward from approximately above the transparent body side; and an identifying step of identifying a chamfered portion of the first transparent body and the region of an inclined portion of the second transparent body based on brightness (light/dark regions) of the image taken by the imaging step, and then, if each region is identified, determining that the second transparent body is laid at a predetermined position of the first transparent body, and if each region is not identified, determining that the second transparent body is not laid at the predetermined position of the first transparent body.

Description

  The present invention provides a transparent laminated body in which a second transparent body is disposed on one side surface of a first transparent body, such as a display window panel of an electronic device, and a second transparent body at a predetermined position of the first transparent body. The present invention relates to an inspection method for inspecting whether or not a body is disposed, and a transparent laminate using the inspection method.

  Conventionally, in an electronic device represented by a flat panel display, a digital camera, a digital video camera, a mobile phone, a portable game machine, etc., by disposing a display window panel that has been subjected to antireflection treatment on its display part, Visibility can be maintained well while the display portion is well protected.

  For example, as shown in FIG. 4, such a display window panel 100 is formed by molding a transparent substrate (first transparent body) 110 having high transparency with a molding machine, and on one side surface of the transparent substrate 110, A material obtained by sticking an antireflection sheet (second transparent body) 120 through an adhesive is widely used.

  Moreover, the display window panel which improved the anti-reflective effect by providing an anti-reflective layer by the dip (dipping) molding method in both surfaces of the one side and the other side of a transparent substrate is also used.

  Further, a display window panel (Patent Document 1) in which antireflection sheets having different optical characteristics are attached to one side surface and the other side surface of the transparent substrate, and a moth-eye structure pattern having an antireflection effect on one side surface of the transparent substrate in advance. A display window panel (Patent Document 2) that has been formed and on which the antireflection sheet having optical characteristics different from the pattern of the moth-eye structure is attached on the other side surface has already been developed by the present applicant.

  By the way, in the display window panel 100 other than the display window panel manufactured by using the dip (immersion) molding method, when the antireflection sheet 120 is stuck on the transparent substrate 110, as shown in FIG. First, an antireflection sheet 120 that is one size larger than this is stuck on the transparent substrate 110, and then the antireflection sheet 120 is cut at a predetermined position using a laser 130. The cut surface of the antireflection sheet 120 is an inclined surface, and the inclination can be adjusted by the laser irradiation angle or the like. Reference numeral 122 in FIG. 5 denotes an inclined portion.

  The position at the time of cutting is set so that the end of the antireflection sheet 120 is positioned inside the position of the outer peripheral edge ridgeline 112 of the transparent substrate 110.

  However, if the cut position of the antireflection sheet 120 has shifted due to some factor, for example, as illustrated in FIG. 6, the antireflection sheet 120 is placed on the outer peripheral edge ridge line 112 of the transparent substrate 110. The inclined portion 122 may be stuck in an overhanging state (overhang state).

  Such a display window panel 100 may cause an object to be caught at the overhanging portion 124 of the antireflection sheet 120 and cause the antireflection sheet to peel off, or may come into contact with this portion and be injured. It is treated as a defective product.

Japanese Patent Application No. 2010-028981 Japanese Patent Application No. 2010-028982

  Inspection of the presence or absence of overhang in the display window panel is performed by visually observing the display window panel, but because the display window panel is transparent, it is difficult to see the defective part, and there is a risk of overlooking the defective product, The fact is that further improvement in inspection accuracy is required.

  In the present invention, in view of such a current situation, whether or not the second transparent body is disposed at a predetermined position of the first transparent body in the transparent laminate in which the second transparent body is disposed at least on the first transparent body. An object of the present invention is to provide a method for inspecting a transparent laminate capable of inspecting the above with high accuracy, and a transparent laminate using the inspection method.

The present invention was invented in order to achieve the problems and objects in the prior art as described above,
The inspection method of the transparent laminate of the present invention is
A first transparent body having a plate shape and having a chamfered portion at the outer peripheral end portion of one surface, and a second transparent body having a plate shape and having an inclined portion at the outer peripheral end portion on one surface of the first transparent body. In the transparent laminated body in which is disposed, the transparent laminated body inspecting method for inspecting whether or not the second transparent body is disposed at a predetermined position of the first transparent body,
The inspection method of the transparent laminate is as follows:
An imaging step of imaging the outer peripheral edge of the transparent laminate from substantially right above the second transparent body side to approximately right below with the imaging means;
When the areas of the chamfered portion of the first transparent body and the inclined portion of the second transparent body are identified based on the difference in brightness / darkness of the image captured in the imaging process, and the respective regions are identified Is determined that the second transparent body is disposed at a predetermined position of the first transparent body, and when the respective areas are not identified, the second transparent body is disposed at the predetermined position of the first transparent body. An identification process for determining that it has not been performed,
It is characterized by having at least.

  With such an inspection method, the chamfered portion of the first transparent body can be identified as a dark portion with less return light than other flat portions, and the chamfered portion of the second transparent body also returns more than the other portions. A region can be identified as a dark part with little light.

  For this reason, when imaging a transparent laminate, which is a non-defective product, from approximately directly above to approximately directly below, both areas can be identified, and when a transparent laminate, which is a defective product, is imaged from approximately directly above to approximately immediately below, Since the chamfered portion and the inclined portion overlap each other, the two regions cannot be distinguished well. By performing this identification, it can be reliably inspected whether or not the transparent laminate is defective.

Moreover, the inspection method of the transparent laminate of the present invention is:
In the identification step,
When areas of the chamfered portion of the first transparent body and the inclined portion of the second transparent body are identified,
Further, based on the position of each region, the distance from the outer peripheral edge of the first transparent body to the position of the outer peripheral edge of the second transparent body is calculated, and this distance falls within a predetermined threshold value. In this case, it is determined that a second transparent body is disposed at a predetermined position of the first transparent body.

With such an inspection method, in addition to the above-described identification step, the arrangement position of the second transparent body relative to the first transparent body can be reliably inspected.

Moreover, the inspection method of the transparent laminate of the present invention is:
When viewing the transparent laminate from the vertical direction,
The horizontal distance of the chamfered portion of the first transparent body is 20 μm or more.

  If the chamfered portion of the first transparent body has such a distance, the region of the inclined portion can be reliably identified in the image captured in the imaging process. For this reason, the transparent laminated body can be inspected reliably, and if there is a defective product, it can be surely found.

Moreover, the inspection method of the transparent laminate of the present invention is:
The inclined portion is a linear chamfer.

  If the chamfered portion is a straight line in this way, the region of the chamfered portion and the portion that is not so appear clearly when captured, and this is particularly preferable as the shape of the chamfered portion that is optimal for inspection.

Moreover, the inspection method of the transparent laminate of the present invention is:
When viewing the transparent laminate from the vertical direction,
The horizontal distance of the inclined portion of the second transparent body is 20 μm or more.

  If the inclined portion of the second transparent body has such a distance, the region of the inclined portion can be reliably identified in the image captured in the imaging process. For this reason, the transparent laminated body can be inspected reliably, and if there is a defective product, it can be surely found.

Moreover, the inspection method of the transparent laminate of the present invention is:
The inclined portion formed at the outer peripheral end of the second transparent body is a cut surface formed by cutting the second transparent body with a laser.

  Thus, if the inclined portion is a laser cut surface, the angle of the inclined portion can be freely set, and the shape of the cut surface is clean, which is suitable for use in manufacturing a transparent laminate.

Moreover, the inspection method of the transparent laminate of the present invention is:
The spectral reflectance in the wavelength band of 550 to 600 nm of the first transparent body is 15% or less.

  If it is a 1st transparent body which has such a spectral reflectance, the area | region of a 1st transparent body and a 2nd transparent body can be identified by using the inspection method of this application, and if there is a defective product, it will be sure You can find it.

Moreover, the inspection method of the transparent laminate of the present invention is:
The spectral reflectance in the wavelength band of 550 to 600 nm of the second transparent body is 10% or less.

  If it is a 2nd transparent body which has such a spectral reflectance, the area | region of a 1st transparent body and a 2nd transparent body can be identified by using the inspection method of this application, and if there is a defective article, it will be sure You can find it.

Moreover, the inspection method of the transparent laminate of the present invention is:
The first transparent body is a transparent substrate;
The second transparent body is an antireflection sheet;
The transparent laminate is a display window panel of an electronic device,
The display window panel is characterized in that the antireflection sheet is adhered to one side surface of the transparent substrate via an adhesive material.

  Thus, if it is a display window panel in which an antireflection sheet is attached to one side of a transparent substrate via an adhesive, it is suitable as a display part of an electronic device, and a defective display can be obtained by using this inspection method. It is possible to reliably prevent the window panel from being shipped accidentally.

The transparent laminate of the present invention is
According to any one of the above-described methods for inspecting a transparent laminate, the arrangement position of the second transparent body with respect to the first transparent body is inspected.

  Thus, in the case of a transparent laminate using the present inspection method, it has been inspected that the second transparent body is surely disposed at a predetermined position of the first transparent body, so that a desired specification can be obtained. As a transparent laminated body having, it can provide reliably to the user of the next process.

  In the shape of the conventional display window panel shown in FIG. 4, when the antireflection sheet (second transparent body) overhangs at the end of the transparent substrate (first transparent body) as shown in FIG. The edge of the outer peripheral edge of the end face of the transparent body was incapable of creating a clear dark region due to light diffusion during imaging, and was indistinguishable from the bright portion of the reflected light of the adjacent flat portion.

  Accordingly, there is no outer peripheral edge, and only the inclined portion of the antireflection sheet (second transparent body) is seen as a dark part, and the antireflection sheet (second transparent body) overhangs the transparent substrate (first transparent body). I couldn't inspect it.

  According to the present invention, in the transparent laminate in which the second transparent body is disposed on at least the first transparent body, the chamfered portion of the first transparent body and the inclined portion of the second transparent body are imaged, By identifying the region on the image, it is possible to inspect whether or not the second transparent body is disposed at a predetermined position of the first transparent body.

FIG. 1 is a schematic diagram illustrating a situation in which an end portion of a display window panel is imaged and an image in which the situation is imaged in the inspection method of the present invention. FIG. 2 is a schematic diagram illustrating a situation in which an end portion of a display window panel having an overhang portion is imaged and an image in which the situation is imaged in the inspection method of the present invention. FIG. 3 illustrates a situation in which the end portion of the display window panel in which the shape of the chamfered portion of the transparent substrate is different from that in FIGS. 1 and 2 and the captured image in the inspection method of the present invention. FIG. FIG. 4 is an enlarged schematic view of the end portion of the display window panel. FIG. 5 is a schematic view for explaining the cutting of the antireflection sheet in the display window panel. FIG. 6 is an enlarged schematic view of an end portion of the display window panel having an overhang portion.

  The present invention inspects whether or not the second transparent body is disposed at a predetermined position of the first transparent body in the transparent laminated body in which the second transparent body is disposed on one surface of the first transparent body. And a transparent laminate using this inspection method.

  Hereinafter, the inspection method of the present invention will be described by taking a display window panel used in a display portion of an electronic device as an example as an embodiment of a transparent laminate.

  Further, in the present specification, the “chamfered portion” is a portion processed at the corner of the portion where the surface intersects the surface, and a portion obtained by obliquely cutting off the end of the plate-like form, The shape is not limited.

  Furthermore, “inclined portion” is used to mean a curved surface including a straight inclined surface, and the shape is not limited as long as there is a height difference from end to end. It is.

  The display window panel 10 shown in FIG. 1 which is one embodiment of the transparent laminate is a plate-like form, and has a transparent substrate 20 having a chamfered portion 22 at the outer peripheral end of one surface, and one of the transparent substrates 20. On the surface, an antireflection sheet 30 having a plate-like shape and having an inclined portion 32 at the outer peripheral end portion is bonded via an adhesive material.

  Since the chamfered portion 22 of the transparent substrate 20 is located, for example, on the surface side of the display portion of the electronic device, the corner is dropped in advance so that the user who uses the electronic device does not get injured at the corner portion.

  The inclined portion 32 of the antireflection sheet 30 is for preventing the antireflection sheet 30 from peeling off from the transparent substrate 20. As a method of forming the inclined portion 32, as described in the background art section, when the antireflection sheet 30 is cut by a laser, the inclined portion 32 is formed according to the irradiation angle of the laser. As will be described later, since the inclined portion 32 becomes a necessary portion for the inspection, the cutting means is not particularly limited as long as the cutting portion is inclined, such as using a cutting blade in addition to the laser.

  As a material for such a transparent substrate 20, a highly transparent synthetic resin can be used. For example, polycarbonate (PC), polymethyl methacrylate (PMMA), or a cycloolefin polymer is preferably used.

  In addition, about selection of the synthetic resin which has high transparency, what is necessary is just to select suitably according to the specification calculated | required as a product, but 1 mm thickness using the spectrophotometer U-3010 by Hitachi High-Technologies Corporation. In the substrate measurement (wavelength band of 550 to 600 nm), a spectral reflectance of 15% or less is preferable for maintaining good visibility.

  On the other hand, the antireflection sheet 30 is preferably selected from commercially available products according to the specifications required for the product. For example, an antireflection layer (not shown) and a hard coat layer (not shown) are used. It is preferable to use an antireflective sheet manufactured by NOF Corporation, an antireflective sheet manufactured by Nippon Kayaku Co., Ltd., etc. having a pressure-sensitive adhesive layer on one side, and a wavelength band. Those having a spectral reflectance of 10% or less at 550 to 600 nm are preferable for maintaining good visibility.

  Such a display window panel 10 is used, for example, in a display part of an electronic device, and thereby, it is possible to maintain good visibility while protecting the display part well.

  Here, the antireflection sheet 30 adhered on the transparent substrate 20 is located on the inner side of the chamfered portion 22 formed on the outer peripheral end portion of the transparent substrate 20, and the end portion of the inclined portion 32 formed on the outer peripheral end portion thereof. Is positioned.

  In the display window panel 10 configured as described above, whether or not the antireflection sheet 30 is reliably cut at a predetermined position of the transparent substrate 20 is first checked by an imaging means (not shown). An image of the outer peripheral end of the display window panel 10 is taken from approximately right above 30 side to approximately right below.

  Then, like the image image surrounded by the ellipse in FIG. 1, the chamfered portion 22 of the transparent substrate 20 and the inclined portion (cut surface) 32 of the antireflection sheet 30 are displayed darker than other flat portions. It becomes. This is because, when light is irradiated from approximately right above the display window panel 10 to approximately right below, regular reflection light is reflected from the flat portion of the display window panel 10, but the chamfered portion 22 and the antireflection sheet of the transparent substrate 20 are reflected. The light is diffused at the inclined portion 32 of 30 and therefore hardly reflects. For this reason, the difference in the degree of reflection of light applied to the display window panel 10 at the time of imaging appears as a difference between light and dark in the image.

  The display window panel 10 shown in FIG. 1 is a non-defective product. In such a non-defective product, the region A of the chamfered portion 22 of the transparent substrate 20 and the region B of the inclined portion 32 of the antireflection sheet 30 are displayed as images. There will be two regions.

  On the other hand, as shown in FIG. 2, in the display window panel 10 which is a defective product, the inclined portion 32 of the antireflection sheet 30 is located on the chamfered portion 22 of the transparent substrate 20, and the antireflection sheet 30 is overhanged. 34, the image obtained by imaging the defective display window panel 10 is such that the inclined portion 32 of the antireflection sheet 30 overlaps the chamfered portion 22 of the transparent substrate 20, and the transparent substrate 20 as shown in FIG. The two regions, the region A of the chamfered portion 22 and the region B of the inclined portion 32 of the antireflection sheet 30 cannot be confirmed, and only one region C in which the two are combined is confirmed.

  Therefore, in the inspection of the display window panel 10 that is performed using the image captured from substantially directly above the display window panel 10 in this way, the region A of the chamfered portion 22 of the transparent substrate 20 and the antireflection sheet 30 When two areas of the area B of the inclined portion 32 are confirmed, the end of the inclined portion 32 of the antireflection sheet 30 is clearly located inside the chamfered portion 22 of the transparent substrate 20 and is a non-defective product. If the two areas of the chamfered portion 22 of the transparent substrate 20 and the area B of the inclined portion 32 of the antireflective sheet 30 are not confirmed, the antireflection sheet 30 is It can be determined that the end of the inclined portion 32 is located and is a defective product.

  In addition, when the two areas of the area A of the chamfered portion 22 of the transparent substrate 20 and the area B of the inclined portion 32 of the antireflection sheet 30 are confirmed, the antireflection sheet 30 starts from the end of the chamfered portion 22 of the transparent substrate 20. Whether or not the distance L to the end of the inclined portion 32 is within a preset threshold value, the position of the end of the region A of the chamfered portion 22 in the image and the end of the region B of the inclined portion 32 are determined. By determining based on the position of the portion, it is possible to confirm whether or not the display window panel 10 is formed within the dimensional range, and the final display window panel 10 that does not fall within the dimensional range is thereby confirmed. It can be judged as a defective product.

Here, the horizontal width T1 of the chamfered portion 22 of the transparent substrate 20 and the horizontal width T2 of the inclined portion 32 of the antireflection sheet 30 are each preferably 20 μm or more. When the numerical value is smaller than this numerical value, it is very expensive and highly accurate in order to identify the areas A and B of the chamfered portion 22 of the transparent substrate 20 and the inclined portion 32 of the antireflection sheet 30 in the captured image. The machine and lighting are used, and time-consuming inspection is required, so the cost performance is poor. For this reason, this width preferably has a width as described above.

  Further, for the inspection of the transparent substrate 20 having a low reflectance and the antireflection sheet 30 having a lower reflectance, it is preferable that the illumination used for the image inspection uses parallel light to produce a light / dark difference in the image.

  Furthermore, it is preferable that the chamfered portion 22 of the transparent substrate 20 is a linear inclined surface. If the shape shown in FIG. 1 or the shape shown in FIG. 3 is used, the region A of the chamfered portion 22 is an image. Appears clearly as a light / dark difference.

  However, the form of the chamfered portion 22 is not limited to this, and the transparent substrate 20 is formed when the display window panel 10 is imaged from substantially directly above to approximately directly below, such as a spherical shape or a concave portion. It is important whether or not the chamfered portion 22 appears as a light / dark difference in the image, so that any form may be used as long as light is diffused to make the reflectance different from that of the flat portion.

  The preferred embodiment of the inspection method of the present invention has been described above using the display window panel of the form shown in FIGS. 1 to 3, but the present invention is not limited to such a form of display panel. For example, as described in the background art section, a display window panel in which an antireflection sheet (second transparent body) having different optical characteristics is attached to one side and the other side of a transparent substrate (first transparent body). When the transparent substrate (first transparent body) is molded, a moth-eye structure pattern having an antireflection effect is formed on one surface of the transparent substrate (first transparent body). It is a highly versatile inspection method that can be applied to inspection of display window panels (transparent laminates) with an antireflection sheet (second transparent body) attached only to the other side of one transparent body. Change according to the form of (transparent laminate) That pressure is possible is a matter of course.

DESCRIPTION OF SYMBOLS 10 ... Display window panel 20 ... Transparent substrate 22 ... Chamfer part 30 ... Antireflection sheet 32 ... Inclined part 34 ... Overhang part A ... Area of the chamfer part of a transparent substrate B: Inclined portion region of antireflection sheet C: One united region T1 .. Horizontal width of chamfered portion of transparent substrate T2 .. Horizontal width of inclined portion of antireflection sheet L. ..Distance from the edge of the chamfered portion of the transparent substrate to the edge of the inclined portion of the antireflection sheet 100 ... display window panel 110 ... transparent substrate 112 ... outer peripheral edge ridge line 120 ... antireflection Sheet 122 ... inclined part (cut surface)
124 ... Overhanging part 130 ... Laser

Claims (10)

A first transparent body having a plate shape and having a chamfered portion at the outer peripheral end portion of one surface, and a second transparent body having a plate shape and having an inclined portion at the outer peripheral end portion on one surface of the first transparent body. In the transparent laminated body in which is disposed, the transparent laminated body inspecting method for inspecting whether or not the second transparent body is disposed at a predetermined position of the first transparent body,
The inspection method of the transparent laminate is as follows:
An imaging step of imaging the outer peripheral edge of the transparent laminate from substantially right above the second transparent body side to approximately right below with the imaging means;
When the areas of the chamfered portion of the first transparent body and the inclined portion of the second transparent body are identified based on the difference in brightness / darkness of the image captured in the imaging process, and the respective regions are identified Is determined that the second transparent body is disposed at a predetermined position of the first transparent body, and when the respective areas are not identified, the second transparent body is disposed at the predetermined position of the first transparent body. An identification process for determining that it has not been performed,
A method for inspecting a transparent laminate, comprising: In the identification step,
When areas of the chamfered portion of the first transparent body and the inclined portion of the second transparent body are identified,
Further, based on the position of each region, the distance from the outer peripheral edge of the first transparent body to the position of the outer peripheral edge of the second transparent body is calculated, and this distance falls within a predetermined threshold value. 2. The method for inspecting a transparent laminate according to claim 1, wherein the second transparent body is determined to be disposed at a predetermined position of the first transparent body. When viewing the transparent laminate from the vertical direction,
The method for inspecting a transparent laminate according to claim 1 or 2, wherein a distance in a horizontal direction of the chamfered portion of the first transparent body is 20 µm or more.   The said chamfering part is a linear square chamfering, The inspection method of the transparent laminated body in any one of Claim 1 to 3 characterized by the above-mentioned. When viewing the transparent laminate from the vertical direction,
The method for inspecting a transparent laminate according to any one of claims 1 to 4, wherein a distance in a horizontal direction of the inclined portion of the second transparent body is 20 µm or more.   The inclined portion formed at the outer peripheral end of the second transparent body is a cut surface formed by cutting the second transparent body with a laser. Inspection method for transparent laminates.   The method for inspecting a transparent laminate according to claim 1, wherein the first transparent body has a spectral reflectance in a wavelength band of 550 to 600 nm of 15% or less.   The method for inspecting a transparent laminate according to any one of claims 1 to 7, wherein the second transparent body has a spectral reflectance of 10% or less in a wavelength band of 550 to 600 nm. The first transparent body is a transparent substrate;
The second transparent body is an antireflection sheet;
The transparent laminate is a display window panel of an electronic device,
The method for inspecting a transparent laminate according to any one of claims 1 to 8, wherein the display window panel has the antireflection sheet attached to one side surface of the transparent substrate via an adhesive material. .   The transparent laminated body by which the test | inspection of the arrangement position of the 2nd transparent body with respect to a 1st transparent body is made | formed by the inspection method of the transparent laminated body in any one of Claim 1 to 9.

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