Film heater

A film heater comprising:

• a transparent conductive film including:
• a first bottom extending in one direction;
• a second bottom facing the first bottom in a direction perpendicular to both of the one direction and a thickness direction of the film heater, and having a length in the one direction longer than a length of the first bottom in the one direction;
• a first oblique side connected to the first bottom and extending in a direction that intersects with the one direction;
• and
• a second oblique side connected to the first bottom at one end opposite to an end to which the first oblique side is connected and extending in a direction that intersects with the one direction;
• a first electrode having a first connection connected to the first oblique side;
• and
• a second electrode having a second connection connected to the second oblique side, wherein
• the transparent conductive film is configured to transmit electromagnetic waves and to generate heat when an electric current flows in the one direction through the transparent conductive film between the first and second connections,
• the length of the first bottom in the one direction is longer than a shortest distance from the second bottom to the first and second connections, and
• an electrical resistance of an end of the second connection adjacent to the first bottom is greater than an electrical resistance of an end of the second connection adjacent to the second bottom.

A film heater comprising:

• a transparent conductive film including:
• a first bottom extending in one direction;
• a second bottom facing the first bottom in a direction perpendicular to both of the one direction and a thickness direction of the film heater, and having a length in the one direction longer than a length of the first bottom in the one direction;
• a first oblique side connected to the first bottom and extending in a direction that intersects with the one direction;
• and
• a second oblique side connected to the first bottom at one end opposite to an end to which the first oblique side is connected and extending in a direction that intersects with the one direction;
• a first electrode having a first connection connected to the first oblique side;
• and
• a second electrode having a second connection connected to the second oblique side, wherein
• the transparent conductive film is configured to transmit electromagnetic waves and to generate heat when an electric current flows in the one direction through the transparent conductive film between the first and second connections,
• the length of the first bottom in the one direction is longer than a shortest distance from the second bottom to the first and second connections,
• the first connection includes a plurality of wavy sections connected and lined up with each other,
• the plurality of wavy sections includes:
• a first extension extending in a direction in which a surface of the transparent conductive film extends;
• a second extension connected to the first extension and extending in a direction that intersects with the direction in which the first extension extends;
• a third extension connected to the second extension and extending in a direction that intersects with the direction in which the second extension extends;
• and
• a fourth extension connected to the third extension and extending in a direction that intersects with the direction in which the third extension extends, the fourth extension facing the second extension and the first extension extend, and
• the plurality of wavy sections adjacent to each other are connected and lined up by connection of (i) an end of the fourth extension on an opposite side of the third extension and (ii) an end of the first extension on an opposite side to the second extension.