LAMINATED POLYESTER FILM

PROBLEM TO BE SOLVED: To provide a laminated polyester film which reduces deflection in a chassis of a reflection sheet and is excellent in brightness unevenness.SOLUTION: There is provided a laminated polyester film in which a polyester layer (B) is laminated on at least one side of a polyester lay...

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Bibliographische Detailangaben
Hauptverfasser:	KUTO NAOMI, YOSHIDA TATSURO, OWATARI HISASHI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING 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 FREQUENCY-CHANGING FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM LIGHTING MECHANICAL ENGINEERING NON-LINEAR OPTICS NON-PORTABLE LIGHTING DEVICES OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR SYSTEMS THEREOF TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSPORTING VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a laminated polyester film which reduces deflection in a chassis of a reflection sheet and is excellent in brightness unevenness.SOLUTION: There is provided a laminated polyester film in which a polyester layer (B) is laminated on at least one side of a polyester layer (A) containing cavities inside. If the center of gravity of a shape formed by removing the cavity part is defined as the area center and the thickness of the whole film is defined as 1 in an arbitrary cross-section in a thickness direction of the film, a distance X from the area center to a nearer film surface is 0.35 or more and 0.48 or less and the rigidity at a film bending angle at 15° measured by a taper-type rigidity tester satisfies the following expression: (1) 0.15≤ S≤0.70 and (2) S≤-8X+4, provided S: the difference in rigidity between the front side and the back side S=SB-SA)/((SA+SB)/2) and SB: the rigidity (mN m) when bending to the B layer side and the rigidity (mN m) when bending to the A layer side.