Mesh filter

A mesh filter used for filtering out foreign substances in fluid, said mesh filter comprising:

• a cylindrical inner cylinder having a hollow interior space;
• a cylindrical outer cylinder concentric with the inner cylinder;
• and
• a filter unit completely surrounding the inner cylinder and having a uniform thickness, the filter unit being integrally-molded to the inner cylinder and the outer cylinder to connect an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder along a radial direction of the inner cylinder,
• wherein, assuming a virtual plane orthogonal to a center axis of the inner cylinder to be an X-Y plane, the filter unit is formed along the X-Y plane,
• wherein the filter unit has a plurality of square-shaped openings between the inner cylinder and the outer cylinder, the openings being formed by a plurality of vertical ribs formed equidistantly so as to be orthogonal to an X-axis and parallel to a Y-axis, and a plurality of lateral ribs formed equidistantly so as to be orthogonal to the vertical ribs and parallel with the X-axis,
• wherein each of the openings has a regular tetragon shape, with a length of 0.1 mm on each side,
• wherein rib widths are defined as dimensions between adjacent openings of the vertical ribs and the lateral ribs and are 0.1 mm,
• wherein thicknesses are defined as dimensions in a direction along the center axis of the inner cylinder, and the thicknesses of the filter unit are 0.3 mm,
• wherein the inner cylinder, the outer cylinder, and the filter unit form an integral, molded unit formed of 66 nylon material so as to have a one-piece construction;
• and
• wherein the inner cylinder and the outer cylinder have an identical axial length in the direction along the center axis of the inner cylinder.