| 主权项 |
1. A fixing device comprising:
a nip member having a first surface and a second surface opposite to the first surface; an endless belt having an inner peripheral surface and an outer peripheral surface, the inner peripheral surface being configured to be in sliding contact with the first surface in a sliding direction; a supporting member having an upstream supporting surface configured to support the nip member, and a downstream supporting surface configured to support the nip member, the downstream supporting surface being disposed downstream of the upstream supporting surface in the sliding direction; and a rotating body configured to rotate and nip the endless belt in cooperation with the nip member, and configured to constitute a nip region between the endless belt and the rotating body, the rotating body having an axis defining an axial direction, the nip region defining a first imaginary plane, a second imaginary plane, and a third imaginary plane, the first imaginary plane being perpendicular to the sliding direction and containing a center of the nip region in the sliding direction, the second imaginary plane being perpendicular to the axial direction and containing a first end portion of the nip region in the axial direction, the third imaginary plane being perpendicular to the axial direction and containing a second end portion of the nip region opposite to the first end portion in the axial direction,
the first surface being a convex shape protruding toward the rotating body in a first cross-section taken along the first imaginary plane, and being concave shape concaved in a direction opposite to the rotating body in a second cross-section and a third cross-section taken along the second imaginary plane and the third imaginary plane, the first surface having at least a portion forming the convex shape and the concave shape, and the portion being positioned between the upstream supporting surface and the downstream supporting surface in the sliding direction. |
