Fixing belt and fixing apparatus

A fixing belt comprising:

• a base having an endless shape;
• and a resin layer covering a surface on an inner peripheral side of the base,
• the resin layer being a cured film of a coated film of a coating material for forming the resin layer, the coating material containing a filler and a resin raw material, the resin layer having a second surface opposite to a first surface facing the base, the second surface having cell structures derived from a convection type cell structure, and
• the second surface being roughened with the filler, wherein
• when a length of the fixing belt in a longitudinal direction is defined as L, a region whose center is a middle point of the fixing member in the longitudinal direction and having a width of L/7 is defined as a central region X, and regions having a width of L/7 from both ends of the fixing belt in the longitudinal direction toward the middle point are defined as end regions Y and Z respectively,
• a coefficient of variation of areas of the cell structures contained in each of the central region X and the end regions Y and Z is 25% or smaller.

A fixing apparatus comprising a fixing belt, the fixing belt comprising a base having an endless shape and a resin layer covering a surface on an inner peripheral side of the base, wherein

• the resin layer comprises a resin and a filler,
• the resin layer has a second surface opposite to a first surface facing the base,
• the second surface has cell structures, wherein
• the second surface is roughened with the filler;
• and wherein
• when a length of the fixing belt in a longitudinal direction is defined as L, a region whose center is a middle point of the fixing member in the longitudinal direction and having a width of L/7 is defined as a central region X, and regions having a width of L/7 from both ends of the fixing belt in the longitudinal direction toward the middle point are defined as regions Y and Z respectively, and
• arithmetic mean roughnesses of the second surface in the central region X and the end regions Y and Z are defined as RaX, RaY and RaZ respectively,
• a difference between RaX and RaY, a difference between RaY and RaZ, and a difference between RaX and RaZ are all 0.1 μm or smaller, and
• a coefficient of variation of areas of the cell structures contained in each of the central region X and the end regions Y and Z is 25% or smaller.