Member with concave portion and method for manufacturing same

A method of manufacturing a member with recessed portions, the member with recessed portions including:

• a printing area in which a large number of recessed portions are formed on a surface thereof;
• and
• a non-printing area in which the recessed portions are not formed on the surface thereof,
• the surface being brought into contact with a viscous material so that the viscous material accumulates in the recessed portions,
• the excess viscous material being scraped off the surface by causing a doctor blade extending horizontally across the surface to contact the surface and relatively moving the doctor blade, wherein:
• the method comprising the steps of:
• manufacturing a base member having the printing area in which the large number of recessed portions are formed on the surface and the non-printing area in which the recessed portions are not formed on the surface;
• forming a DLC coating so as to cover the printing area and the non-printing area;
• and
• forming a plurality of grinding traces by grinding the DLC coating, the plurality of grinding traces forming an inclined angle of other than 0° and 90° with respect to an imaginary reference line corresponding to the doctor blade extending horizontally across and in contact with the surface,
• wherein a mean roughness Sa of the surface in the non-printing area of the member with recessed portions is 0.005 to 0.10 μm and
• the mean roughness surface Sa is a three-dimensional roughness defined by a volume surrounded by a curved surface shape and a mean plane divided by a measured area.