Capacitance sensing device and image reading device

An electrostatic capacitance detection device to detect a change in electrostatic capacitance based on an electric field formed between electrodes, the electrodes comprising a first electrode and a second electrode comprising conductive patterns defining profiles of the electrodes, the electrostatic capacitance detection device comprising:

• the first electrode corresponding to one of the electrodes;
• the second electrode corresponding to another of the electrodes, at least a part of the second electrode being opposed to the first electrode across a transport path extending in a transport direction in which a detection target having a sheet shape is transported;
• a first floating electrode disposed on a side of the first electrode opposite to the transport path;
• and
• a second floating electrode disposed on a side of the second electrode opposite to the transport path,
• wherein at least one of the first floating electrode or the second floating electrode is supplied with an electric potential or is connected to a feeder line.

An electrostatic capacitance detection device to detect a change in electrostatic capacitance based on an electric field formed between electrodes, the electrostatic capacitance device comprising:

• a first electrode corresponding to one of the electrodes;
• and
• a second electrode corresponding to another of the electrodes, at least a part of the second electrode being opposed to the first electrode across a transport path extending in a transport direction in which a detection target having a sheet shape is transported, wherein
• the first electrode and the second electrode comprise conductive patterns defining profiles of the electrodes, and
• at least one of the first electrode or the second electrode comprises a first electric field adjuster for adjusting the electric field, the first electric field adjuster comprising at least one of three types including an inner gap formed inside the profile and having a shape defined by a hollow formed in the conductive pattern, a notch extending inward from the profile, and a serration defined by the profile comprising a serrated edge.