Film used for fixing device and fixing device including the film

A fixing device that fixes an image onto a recording material, the fixing device comprising:

• a fixing member including a tubular base layer, an electrode portion formed on the base layer, a heat generating portion formed by a plurality of thin linear layers extending in a longitudinal direction of the fixing member and spaced from one another along a circumferential direction of the fixing member, the heat generating portion being formed on the base layer in such a manner as to be positioned next to the electrode portion in the longitudinal direction of the fixing member and electrically connected to the electrode portion, and an rubber layer formed on the heat generating portion, the rubber layer being disposed to extend over a boundary between the heat generating portion and the electrode portion in the longitudinal direction of the fixing member, the fixing member being configured to come into contact with the image;
• and
• a power supply member configured to supply power through the electrode portion to the heat generating portion,
• wherein the fixing member generates heat as current flows through the heat generating portion, and a toner image is fixed onto the recording material by the heat of the fixing member, and
• wherein in the circumferential direction of the fixing member, a total area on which all of the thin linear layers are provided is 1/10 to ¾ of an entire length of the base layer.