OPTICAL COMPOSITE FILM HAVING HIGH HEAT RADIATION PROPERTY AND HEAT RADIATION METHOD USING THE FILM

PROBLEM TO BE SOLVED: To provide an optical film which is improved in heat radiation properties without spoiling the transparency of the original visible light zone of the optical film. SOLUTION: On at least one side of an optical film substrate 1, a coating film 2 is formed which has a visible light transmittance greater than that of the film substrate 1 (preferably at least 90%), a sunshine heat absorption factor smaller than that of the film substrate (preferably 0.01-11%), a radiation absorption factor in the wavelength region of normal temperature heat radiation smaller than that of the film substrate (preferably 0.01-20%), and a heat content smaller than that of the film substrate (preferably 10% or below in relation to the film substrate). By making the surface of the coat be contacted with a cooling fluid A such as air or water, heat is radiated from the high temperature film substrate. COPYRIGHT: (C)2005,JPO&NCIPI