US 11,850,780 B2
Resin member, mold for molding resin member, and method for manufacturing resin member
Sakura Nakano, Hiroshima (JP); Masaaki Akamine, Hiroshima (JP); Kaname Sawai, Hiroshima (JP); Akihiro Hosono, Hiroshima (JP); Shuhei Narita, Hiroshima (JP); and Yu Tanaka, Hiroshima (JP)
Assigned to MAZDA MOTOR CORPORATION, Hiroshima (JP)
Appl. No. 17/295,980
Filed by MAZDA MOTOR CORPORATION, Hiroshima (JP)
PCT Filed Nov. 15, 2019, PCT No. PCT/JP2019/044955
§ 371(c)(1), (2) Date May 21, 2021,
PCT Pub. No. WO2020/105563, PCT Pub. Date May 28, 2020.
Claims priority of application No. 2018-219766 (JP), filed on Nov. 22, 2018.
Prior Publication US 2022/0024095 A1, Jan. 27, 2022
Int. Cl. B29C 45/37 (2006.01); B60R 13/02 (2006.01); B29L 11/00 (2006.01); B29L 31/30 (2006.01)
CPC B29C 45/372 (2013.01) [B60R 13/02 (2013.01); B29L 2011/00 (2013.01); B29L 2031/3005 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A resin member comprising:
a resin substrate; and
a micro-embossed pattern formed on a surface of the resin substrate and having a plurality of recesses and a plurality of protrusions, wherein
a plane passing through three optional lowest points that are deepest points included in the micro-embossed pattern per unit area is used as a reference plane, and a shortest distance from the reference plane to an optional point on the micro-embossed pattern is regarded as a height of the micro-embossed pattern,
the plurality of protrusions includes:
a plurality of first protrusions having a height of from 15 μm to 35 μm; and
a plurality of second protrusions having a height of from ¼ to ¾ of the height of the first protrusions,
a distance between peaks of two adjacent ones of the plurality of protrusions ranges from 100 μm to 500 μm,
in a cross sectional view perpendicular to the reference plane, the micro-embossed pattern extends a predetermined distance in a direction parallel to the reference plane and is divided into minute regions each having a predetermined length between a first pair of points on the reference plane projected thereon from a corresponding second pair of points located on the micro-embossed pattern,
in the cross-sectional view perpendicular to the reference plane, the number of the minute regions having an angle of inclination formed between a straight line passing through the second pair of points and the reference plane of from −10° to 10° ranges from 78% to 95% of the number of all of the minute regions included in the micro- embossed pattern extending the predetermined distance, and
the number of the minute regions having an angle of inclination of from −1° to 1° ranges from 25% to 40% of the number of all of the minute regions.