Kimoto Co, Ltd.

Tsuyoshi Nagahama

Yasumaro Toshima

Kazuhiro Nozawa

Shuzo Tomizawa

Kyoko Aihara

Satoshi Uegaki

Hiroki Yamamoto

A low reflective film includes a first resin layer. The first resin layer includes a binder resin and an organic resin particle having an average particle size Dof 2 to 20 μm. A surface of the first resin layer has a reflectance and gloss values satisfying the following relationships:

Low reflective film and optical sensing kit using the same, and low reflective molded product

Provided are a light-blocking member, a black resin composition, and a black resin molded article in which the optical density per predetermined thickness is increased. In a light-blocking member () comprising a substrate () and a light-blocking membrane () provided on at least one surface of this substrate (), the light-blocking membrane () containing a binder resin (), a first black pigment () having an average particle diameter Dof 0.4 to 2.5 &#x3bc;m, and a second black pigment () having an average particle diameter Dsmaller than this is employed. The average particle diameter Dof the second black pigment () is preferably 0.01 to 0.3 &#x3bc;m. The optical density of the light-blocking membrane () is preferably 0.54 to 2.00 (&#x3bc;m) in terms of thickness.

Light-blocking member, black resin composition, and black resin molded article

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

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

Provided are a light-blocking member, a black resin composition, and a black resin molded article having excellent durability and solvent resistance, and the like. In a light-blocking member () comprising a substrate () and a light-blocking membrane () provided on at least one surface of this substrate (), the light-blocking membrane () containing an ultraviolet curable resin as a binder resin and containing a black pigment as a filler dispersed in this binder resin is employed. The light-blocking membrane () preferably further contains photo- and/or thermal polymerization initiators. In addition, the content of the filler in the light-blocking membrane () is preferably 10% by mass or more and 60% by mass or less in terms of solids based on all resin components contained in the light-blocking membrane ().

Provided is a method for producing a light-blocking material for optical devices which is provided with a light-blocking coat achieving low gloss while maintaining the necessary physical properties of a light-blocking coat, i.e. a light-blocking property, even when the light-blocking coat is formed extremely thinly. In the method for producing the light-blocking material for optical devices which is provided with the light-blocking coat, a coating liquid including at least a binder resin, black microparticles, and a dye is prepared. A dye including a metal such as chrome oxide, iron oxide, or cobalt oxide is preferably used as the dye. The coating liquid is subsequently applied to a base material, and dried to form the light-blocking coat.

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Saitama, Japan

Tsuyoshi Nagahama