Patent ID: 11129974

Abstract:
The present invention provides a fine hollow protruding tool (1) having a basal member (2) and a fine hollow protrusions (3) project from the basal member (2). The fine hollow protrusions (3) each has an opening portion (3h) on a tip side thereof and an interior in which an interior space linked to the opening portion (3h) is formed. In any vertical cross-section passing through an apex of the fine hollow protrusion (3), a wall thickness (T1) in an apex-side region (TB) on the apex side is thinner than a wall thickness (T2) in a lower-side region (BP) that is closer to the basal member (2) than the apex-side region (TB) is, and a gap (M1c) between inner walls (31) in the apex-side region (TB) is smaller than a gap (M2c) between the inner walls (31) in the lower-side region (BP). A base portion (34) of the fine hollow protrusion (3) projecting from the basal member (2) has a curvature. An entrance portion (23) to the fine hollow protrusion (3), on a back face (25) of the basal member (2) opposite from a front face (24) from which the fine hollow protrusions (3) project, has a curvature.