JP2006250551A - Observation device for visually inspecting film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and stably inspect and evaluate the flaw such as irregularity or the like produced in a inspection target film with good reproducibility. <P>SOLUTION: The observation device for visually inspecting the inspection target film 35 is equipped with curvature adjusting plates 23-27, which are provided so as to be freely slid to support the inspection target film 35 in a curved surface state, and a light source 28 for illuminating the inspection target film 35 supported in the curved surface state. By adjusting the respective positions of the curvature adjusting plates 23-27, the curved surface state of the inspection target film 35 can be changed and the observation of the inspection target film 35 in arbitrary curvature can be performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an observation device for visual inspection in which an inspection object film such as an antiglare film is illuminated with illumination light and an inspector visually observes unevenness of the film.

  When viewing images etc. on the screen of various display devices such as liquid crystal display devices, the illumination light of the room is reflected on the screen, and objects placed around the display device and the viewer are reflected on the screen. This makes it difficult to see the image displayed on the screen. For this reason, for the purpose of preventing reflection, an antiglare film capable of obtaining an irregular reflection effect is applied to the screen.

  For example, a liquid crystal display device uses an antiglare film having a surface subjected to anti-gloss treatment or the like. Using this anti-glare film significantly improves the visibility of the screen, but due to film manufacturing conditions, etc., non-uniform scattering of the film and interference due to non-uniform film thickness, etc. If unevenness occurs, it will be difficult to see. Therefore, after the film is manufactured, it is necessary to inspect the quality of the film as a sample.

  FIG. 3 shows a conventional visual inspection apparatus described in Patent Document 1, in which a flat inspection plate 3 is tiltably mounted on a gantry 1 using a column 2. The flat inspection plate 3 includes a transparent glass plate 4 for placing a transparent film (not shown) to be inspected, a transparent glass plate 7 carrying the developed white film 5 or black film 6, and a plurality of light sources 8. A white roll curtain 10 for laminating the white film 5 or the black film 6 between the transparent glass plate 4 and the transparent glass plate 7. The black roll curtain 11 is arranged at the upper end between the transparent glass plate 4 and the transparent glass plate 7.

JP 2004-198164 A

  When observing the inspection target film, it is necessary to inspect while changing the viewing angle with respect to the inspection target film. When the size of the inspection target film is small, even with a conventional visual inspection apparatus, if the inspection target film is taken together, the entire surface of the film can be observed at the same viewing angle. However, when the film size is increased, the conventional visual inspection apparatus cannot perform efficient inspection. This is because the conventional inspection table 3 has a flat plate shape, and when the film to be inspected is spread on the inspection table 3, the area that can be inspected within the same viewing angle is limited to the entire surface of the film. Therefore, in order to inspect the entire surface of the film, the inspector must change and move his / her own eye position and viewing direction so that the viewing angle is the same for each region of the film.

  In addition, when a certain inspector finds a defect such as unevenness in a certain part of the film to be inspected and this is confirmed by another inspector, the other inspector also needs to inspect that part with the same viewing angle. However, the larger the film size, the longer it takes to find the defective part at the same viewing angle, and the problem is that the reproducibility of the inspection is poor. Further, as the size of the inspection target film increases, it becomes difficult to uniformly illuminate the entire surface of the inspection target film, which also makes efficient and stable inspection difficult.

  Visual inspection and evaluation of film to be inspected has a large individual difference among inspectors, and when inspecting a large film to be inspected, as described above, movement of the line of sight is involved, making it difficult to reproduce the inspection conditions. . For this reason, efficient and stable inspection is difficult simply by moving the inspection table.

  An object of the present invention is to provide an observation device for visual inspection of a film that can efficiently and stably inspect and evaluate defects such as unevenness occurring in an inspection target film.

  The observation device for visual inspection of a film according to the present invention is characterized by comprising curved surface support means for supporting the inspection target film in a curved state and a light source for illuminating the inspection target film supported in the curved state.

  In the observation apparatus for visual inspection of a film according to the present invention, the curved surface supporting means includes an adjusting means for changing the curved surface state.

  The observation device for visual inspection of a film according to the present invention is characterized in that the type of the light source can be changed.

  An observation apparatus for visual inspection of a film according to the present invention is characterized by comprising means for adjusting the amount of illumination light from the light source.

  The observation apparatus for visual inspection of a film according to the present invention comprises means for adjusting an incident angle of illumination light irradiated from the light source onto the surface of the inspection object film or a light receiving angle of the inspection object film.

  According to the present invention, since the inspection target film is adjusted to a curved surface state and observed with illumination light, a wide range of defect observation of the inspection target film can be performed efficiently, stably and with good reproducibility.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded schematic view of an observation device for visual inspection of a film according to an embodiment of the present invention, and FIG. 2 is a schematic side view thereof. The observation apparatus for visual inspection according to the present embodiment includes a horizontal base 20, columns 21 and 22 erected on the left and right of the horizontal table 20, and supported in parallel between the columns 21 and 22 and supported by the columns 21 and 22. In this embodiment, which is supported so as to be slidable in the front-rear direction, the five curvature adjusting plates 23, 24, 25, 26, 27 are arranged in front of the columns 21, 22 in parallel with the front edges of the curvature adjusting plates 23-27. And an external light source 28 such as a long fluorescent lamp.

  Although only one external light source 28 is provided in the illustrated example, a plurality of different types of light sources such as a white fluorescent lamp, a daylight fluorescent lamp, and an incandescent lamp are installed, and one of the light sources is selected to emit light (not shown). A light source selector may be provided. Moreover, it is preferable to provide a dimmer (not shown) that adjusts the light emission amount of the selected light source. Furthermore, it is also preferable that the installation positions of various light sources are movably provided.

  The observation device for visual inspection according to the present embodiment is further provided with a film stopper attached to each front end edge of the uppermost curvature adjustment plate 23 and the lowermost curvature adjustment plate 27 among the five curvature adjustment plates 23 to 27. Tools 29 and 30 and a black flexible sheet 31 such as a black rubber sheet, for example. The upper edge 31 a of the black flexible sheet 31 is fastened to the fastener 29 and the lower edge 31 b is fastened to the fastener 30. Yes.

  For example, when observing a film to be inspected with an antiglare treatment due to a diffuse reflection effect on the surface with such an observation apparatus for visual inspection, the film to be inspected 35 is placed on the black flexible sheet 31 as shown in FIG. The external light source 28 is turned on. Then, the inspector visually inspects whether there is a defect such as unevenness while changing the curvature and curved surface state of the film 35 to be inspected by slidingly adjusting the positions of the curvature adjusting plates 23 to 27.

  At this time, if necessary, the type of the external light source 28 is changed, the amount of light is changed, or the installation position of the external light source 28 is moved to receive the incident angle of the illumination light on the inspection target film 35 or the light reception on the film surface. Perform inspection by adjusting the corners. Instead of moving the installation position of the external light source 28, the incident angle of the illumination light and the film light receiving angle to the inspection target film may be adjusted by moving the horizontal table 20 side.

  As a result, it is possible to stably observe defects such as unevenness due to non-uniformity of the scattering state on the inspection target film 35 and non-uniformity of the film thickness. When unevenness is observed at a certain location of the film 35 to be inspected, if the setting state of the visual inspection observation device is kept as it is, other inspectors can observe the same unevenness, and inspection with high reproducibility. Is possible.

  Further, in the visual inspection observation apparatus of the present embodiment, the inspection target film 35 is formed into a cylindrical curved surface and the surface inside the curved surface is illuminated and observed with the external light source 28, so that the observation range can be widened, A wide range of defect inspections can be performed efficiently.

  In the visual inspection observation apparatus according to this embodiment, the inspection target film 35 is formed into a cylindrical curved surface and the curvature thereof can be adjusted. For example, a plurality of curvature adjustment plates 23 to 27 are provided between the left and right support columns 21 and 22. By dividing the divided adjustment plates into slidable in the front-rear direction, the film to be inspected can be adjusted to a curved surface state having an arbitrary shape, and the film can be observed in various curved surface states.

  In the embodiment described above, the black flexible sheet 31 is used. However, for example, a black PET (polyethylene terephthalate) sheet or the like is pasted on the back of the film 35 to be inspected, and this is attached to the fasteners 29 and 30. It is also possible to attach and observe the inspection object film 35.

  The observation apparatus for visual inspection of a film according to the present invention can perform visual inspection of a film efficiently, stably and with good reproducibility, and is therefore useful as an inspection apparatus for visually inspecting defects such as an antiglare film. .

It is a disassembled schematic diagram of the observation apparatus for visual inspection of the film which concerns on one Embodiment of this invention. It is a side surface schematic diagram of the observation apparatus for visual inspection shown in FIG. It is a block diagram of the conventional visual inspection apparatus.

Explanation of symbols

20 Horizontal bases 21 and 22 Posts 23 to 27 Curvature adjusting plate 28 External light sources 29 and 30 Fastener 31 Black flexible sheet 35 Film to be inspected

Claims (5)

  An observation apparatus for visual inspection of an inspection object film, comprising: curved surface support means for supporting the inspection object film in a curved surface state; and a light source for illuminating the inspection object film supported in a curved surface state. Observation device for visual inspection.   2. The observation apparatus for visual inspection of a film according to claim 1, wherein the curved surface support means includes an adjusting means for changing the curved surface state.   The observation apparatus for visual inspection of a film according to claim 1 or 2, wherein the type of the light source is changeable.   The observation apparatus for visual inspection of a film according to any one of claims 1 to 3, further comprising means for adjusting the amount of illumination light from the light source.   5. The apparatus according to claim 1, further comprising means for adjusting an incident angle of illumination light applied to the surface of the inspection target film from the light source or a light receiving angle of the inspection target film. Observation device for visual inspection of film.

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