US 12,031,204 B2
Titanium member, method for manufacturing titanium member, and decorative article including titanium member
Kotaro Takazaki, Sayama (JP); and Masahiro Satoh, Iruma (JP)
Assigned to CITIZEN WATCH CO., LTD., Tokyo (JP)
Appl. No. 16/979,921
Filed by CITIZEN WATCH CO., LTD., Tokyo (JP)
PCT Filed Mar. 13, 2019, PCT No. PCT/JP2019/010316
§ 371(c)(1), (2) Date Sep. 11, 2020,
PCT Pub. No. WO2019/177039, PCT Pub. Date Sep. 19, 2019.
Claims priority of application No. 2018-048109 (JP), filed on Mar. 15, 2018.
Prior Publication US 2021/0010122 A1, Jan. 14, 2021
Int. Cl. B32B 15/01 (2006.01); A44C 27/00 (2006.01); C22F 1/18 (2006.01)
CPC C22F 1/183 (2013.01) [A44C 27/002 (2013.01); Y10T 428/12993 (2015.01)] 17 Claims
OG exemplary drawing
 
1. A titanium member comprising:
a first region where a plurality of first convex structural bodies extending in a first direction are arranged on a surface of the titanium member in a second direction orthogonal to the first direction,
wherein each first convex structural body has first convex portions arranged on an upper surface of the first convex structural body at an interval within a range of 300 nm to 500 nm along the first direction,
wherein a height of each first convex portion above the first convex structural body is within a range of 40 nm to 70 nm, and
in the first region, a difference between an R value and a G value is within 30, and a B value is larger than the R value by 70 or more and is larger than the G value by 70 or more, wherein each of the R value, the G value, and the B value is an integer of 0 or more and 255 or less in red, green and blue (RGB) measurement values.