Multilayer light-blocking film, and light-blocking ring for optical equipment, lens unit, and camera module using the same

Abstract

There are provided a multilayer light-blocking film and the like whose front and back surfaces are easy to discriminate while they have light-blocking layers having high optical density whose front and back are usually difficult to discriminate. A multilayer light-blocking filmhas a multilayer structure comprising at least a substrate film, a light-blocking layerprovided on one major surfaceside of this substrate film, and a light-blocking layerprovided on the other major surfaceside, the light-blocking layerand the light-blocking layerhave an optical density of 2.5 or more in total, and the difference between the 60-degree glossiness of the light-blocking layerand the 60-degree glossiness of the light-blocking layeris 0.1% or more and 9.9% or less. The substrate filmand the light-blocking layerand/or the light-blocking layerpreferably have inclined end surfaces, and/orso that a film width increases from the light-blocking layertoward the light-blocking layer