OPTICAL FILM MANUFACTURING METHOD, OPTICAL FILM, AND IMAGE DISPLAY DEVICE

• Main Authors: INOUE RYUICHI, SHINAGAWA MASA
• Format: Patent
• Language: English; Japanese
• Published: 08.02.2016
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; FREQUENCY-CHANGING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PERFORMING OPERATIONS; PHYSICS; POLISHES; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPRAYING OR ATOMISING IN GENERAL; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical film, which prevents appearance defects caused by foreign substances and/or air bubbles even when the optical film is thin.SOLUTION: An optical film manufacturing method includes a first coating step for removing foreign substances by coating adhesion surfaces of first and second films with a liquid material having a viscosity of 1 to 10000 cP by means of a post-metered coating method. The method preferably includes a second coating step in which: when only an adhesion surface of one of the films is coated with the liquid material, an adhesion surface of a film not coated with the liquid material is coated with a bonding or adhesive composition by means of the post-metered coating method; or when the adhesive surfaces of both films are coated with the liquid material, at least an adhesive surface of one film is coated with the bonding or adhesive composition by means of the post-metered coating method.SELECTED DRAWING: Figure 1 【課題】光学フィルムが薄型であっても、異物および／または気泡に起因した外観欠点の発生が防止された光学フィルムの製造方法を提供すること。【解決手段】後計量塗布方式を用いて、第１フィルムの貼合面および第２フィルムの貼合面に、粘度が１〜１００００ｃＰである液状物を塗布することにより、異物を除去する第１塗布工程を有する光学フィルムの製造方法。液状物を一方のフィルムの貼合面のみに塗布する場合は液状物を塗布していないフィルムの貼合面に、あるいは液状物を両方のフィルムの貼合面に塗布する場合は少なくとも一方のフィルムの貼合面に、後計量塗布方式を用いて、接着剤組成物または粘着剤組成物を塗布する第２塗布工程を有することが好ましい。【選択図】図１