Rubber Member, Tire, and Method of Manufacturing Rubber Member
A vehicle tire, as a rubber member, includes, on at least a part of the surface thereof, a fine ridged/grooved structure formed via transfer from a mold and having fine ridged/grooved portions arranged at a constant arrangement pitch, wherein a region in which the fine ridged/grooved structure is provided is visually recognizable by a different structural color from the colors of other regions.
1 . A tire made of a rubber member comprising: a fine ridged/grooved structure on at least a part of a surface of the rubber member, the fine ridged/grooved structure formed via transfer from a mold and having fine ridged/grooved portions arranged at a constant arrangement pitch;
a region in which the fine ridged/grooved structure is provided being visually recognizable by a structural color different from colors of other regions.
2 . The tire according to claim 1 , wherein
the fine ridged/grooved structure is formed on a sidewall portion of the tire, and
the region in which the fine ridged/grooved structure is provided is formed in a shape to display predetermined information.
3 . The tire according to claim 2 , wherein
the sidewall portion contains a diene rubber, a carbon black, and a silica, and
the diene rubber contains from 30 to 70 mass % of natural rubber and/or isoprene rubber, a nitrogen adsorption specific surface area of the carbon black is from 20 to 60 m 2 /g, a content of the carbon black is from 5 to 45 parts by mass per 100 parts by mass of the diene rubber, a content of the silica is from 15 to 55 parts by mass per 100 parts by mass of the diene rubber, and a total content of the carbon black and the silica is from 30 to 60 parts by mass per 100 parts by mass of the diene rubber.
4 . The tire according to claim 1 , wherein
the arrangement pitch or ridge/groove height of the fine ridged/grooved portions is determined based on a wavelength of visible light, the wavelength corresponding to a color visually recognizable as the structural color, and
the arrangement pitch or ridge/groove height of the fine ridged/grooved portions is equal to or smaller than 650 nm.