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KR-102962641-B1 - INSPECTING APPARATUS

KR102962641B1KR 102962641 B1KR102962641 B1KR 102962641B1KR-102962641-B1

Abstract

An inspection device according to one embodiment of the present invention is an inspection device for inspecting an optical film, comprising: a light irradiator facing a first surface of the optical film and irradiating a first light onto the first surface; a light reflector facing a second surface of the optical film different from the first surface; and a light sensor facing the first surface.

Inventors

  • 김형준
  • 정근창
  • 조강욱

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260511
Application Date
20160725

Claims (13)

  1. In an inspection device for inspecting optical films, A light irradiator facing the first surface of the optical film and directly irradiating the first surface with a first light; A light reflector facing the second surface different from the first surface of the optical film; A light sensor facing the first surface above; A first roll and a second roll for transporting the optical film in a first direction; An ink injector that selectively sprays ink onto the optical film; and It includes a controller that controls at least one of the light irradiator, the light reflector, the light sensor, the first roll, the second roll, and the ink ejector, and The light reflector is positioned to reflect the second light generated by the first light passing through the optical film, and The light sensor is positioned to sense a third light generated by the reflected second light passing through the optical film, and The optical sensor transmits a position information signal to the controller when a specific location within the area measured by the optical sensor satisfies a preset condition. The above location information signal includes information about the specific location within the area being measured, and The above preset condition is that the luminance level of the third light is higher than the first preset luminance level and lower than the second preset luminance level, and An inspection device in which the second preset brightness level is higher than the first preset brightness level.
  2. In paragraph 1, An inspection device further comprising an angle adjustment unit that supports the light reflector and adjusts the angle between the light reflector and the optical film.
  3. In paragraph 2, The above angle adjustment unit is, A stage that supports the light reflector and is capable of at least one of tilting and rotating; and An inspection device including a motor that drives the above stage.
  4. In paragraph 1, The light irradiator includes a light-emitting diode (LED) ring surrounding the light sensor, and The above light-emitting diode ring is, A body having a ring shape; and An inspection device comprising light-emitting diodes installed in the above body.
  5. In paragraph 1, The above light irradiator is, A body having one surface and a frame protruding from the one surface; Light-emitting diodes (LEDs) installed on the above surface; and An inspection device comprising a light guide plate installed in the above frame, disposed between the light-emitting diodes and the light reflector, and guiding the direction of propagation of light generated by the light-emitting diodes.
  6. In paragraph 1, The above optical film is, A polarizing plate facing the light irradiator for polarizing incident light; and An inspection device that delays the polarization phase of incident light and includes a phase delay plate facing the light reflector.
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  8. In paragraph 6, The light irradiator and the light sensor are positioned between the first roll and the second roll with respect to the first direction, which is the direction in which the optical film is transported. An inspection device in which the first direction is the direction from the first roll to the second roll.
  9. In paragraph 8, The width of the second direction of the optical sensor is wider than the width of the second direction of the optical film, and The inspection device, wherein the second direction is the axial direction of the first roll.
  10. In paragraph 8, The above ink jet is an inspection device positioned between the light sensor and the second roll with respect to the first direction.
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  13. In Paragraph 10, The controller calculates the location where a foreign substance exists within the optical film based on the location information signal, generates an ink sprayer control signal including information about the location where the foreign substance exists, and transmits the generated ink sprayer control signal to the ink sprayer. The above ink sprayer is an inspection device that sprays ink at the location where the foreign substance is present based on the ink sprayer control signal.

Description

Inspecting apparatus An embodiment of the present invention relates to an inspection device. An optical film is used to improve the outdoor visibility of smart devices, etc. This optical film may include a polarizer and a means for delaying the phase bonded to the polarizer (e.g., a phase delay plate). A common method for inspecting polarizers among optical films is to overlap two optical films so that the polarization directions of the polarizers are perpendicular to each other, and then irradiate them with light to measure the brightness. However, in the case of optical films containing polarizers and phase delay plates, precise measurement was difficult because the phase delay plate made it difficult to use methods for measuring luminance. FIG. 1a is a drawing for explaining an inspection device according to an embodiment of the present invention. Figure 1b is a cross-sectional view along line II' of Figure 1a. Figure 2 is a diagram illustrating the case where a light sensor detects a foreign substance. Figure 3 is a block diagram illustrating the operation of the inspection device of Figure 1a. Figures 4a and 4b are diagrams for explaining the polarization of the first light, second light, and third light of Figure 1b. FIG. 5a is a drawing for explaining an inspection device according to another embodiment of the present invention. Figure 5b is a cross-sectional view along the line II-II' of Figure 5a. FIG. 6 is a drawing for explaining one embodiment of a light irradiator in the inspection device of FIG. 1a. FIG. 7a is a drawing for explaining one embodiment of a light irradiator in the inspection device of FIG. 5a. Figure 7b is a cross-sectional view along the line III-III' of Figure 6a. FIG. 8 is a drawing for explaining the angle adjustment unit within the inspection device of FIG. 1a. Preferred embodiments according to the present invention will be described in detail below with reference to the attached drawings. Throughout the specification, identical reference numerals denote substantially identical components. In the following description, if it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the essence of the invention, such detailed description is omitted. Furthermore, the component names used in the following description may have been selected for ease of drafting the specification and may differ from the actual product part names. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Additionally, in this specification, when a part such as a layer, film, region, or plate is described as being formed "on" another part, the direction in which it is formed is not limited to the upward direction only, but includes cases where it is formed in the lateral or downward direction. Conversely, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. FIG. 1a is a drawing for explaining an inspection device according to an embodiment of the present invention, and FIG. 1b is a cross-sectional view along the line I-I' of FIG. 1a. Referring to FIGS. 1a and 1b, an inspection device for inspecting an optical film (200) may include a light irradiator (110), a light reflector (120), a light sensor (130), a first roll (140), a second roll (145), a third roll (150), an angle adjustment unit (160), and an ink sprayer (170). The detailed structure of the optical film (200) will be described in detail later with reference to FIG. 4. In FIG. 1a, the first roll (140), the second roll (145), and the third roll (150) are omitted for convenience of explanation. For convenience of explanation, the first direction (DR1) may be defined as the direction in which the optical film (200) is transported, the second direction (DR2) may be defined as the axial direction of the first roll (140), and the third direction (DR3) may be defined as a direction intersecting the plane formed by the extension of the first direction (DR1) and the second direction (DR2). The light irradiator (110) can generate a first light (L1). According to an embodiment, the light irradiator (110) may include a light-emitting diode (LED) ring, and the light-emitting diode (LED) ring will be described in detail later with reference to FIG. 6