Input device and input system

An input device comprising:

• a base member placed on a front surface of a touchscreen panel;
• an operating member provided to be rotatable around a rotational axis with respect to the base member;
• and
• a first fixed electrode and a second fixed electrode arranged on a principal surface of the base member, and configured to remain fixed in all directions relative to the touchscreen panel when the operating member is rotated,
• the first fixed electrode and the second fixed electrode being configured to, as the operating member is operated, be switched from an electrically conductive state into an electrically non-conductive state, or vice versa,
• the touchscreen panel including:
• one or more first line electrodes extending along a longitudinal axis thereof and having a portion overlapping with the first fixed electrode when viewed along a normal to the front surface of the touchscreen panel;
• and
• a plurality of second line electrodes intersecting with the one or more first line electrodes when viewed along the normal to the front surface of the touchscreen panel,
• all of a plurality of tangential lines extending along the longitudinal axis of the one or more first line electrodes and being in contact with outer end edges of the first fixed electrode when viewed along the normal to the front surface of the touchscreen panel including a first tangential line and a second tangential line, the first tangential line being located more distant, in a first direction intersecting with the longitudinal axis of the one or more first line electrodes, from a particular first line electrode out of the one or more first line electrodes than any other one of the plurality of tangential lines in contact with the outer end edges of the first fixed electrode, the second tangential line being located more distant, in a second direction opposite from the first direction, from the particular first line electrode than any other one of the plurality of tangential lines in contact with the outer end edges of the first fixed electrode,
• all of a plurality of tangential lines extending along the longitudinal axis of the one or more first line electrodes and being in contact with outer end edges of the second fixed electrode when viewed along the normal to the front surface of the touchscreen panel including a third tangential line and a fourth tangential line, the third tangential line being located more distant, in the first direction, from the particular first line electrode than any other one of the plurality of tangential lines in contact with the outer end edges of the second fixed electrode, the fourth tangential line being located more distant, in the second direction, from the third tangential line than any other one of the plurality of tangential lines in contact with the outer end edges of the second fixed electrode,
• the first fixed electrode including a first shifted portion shifted by a first predetermined distance between the second tangential line and the fourth tangential line with respect to the second fixed electrode, and
• the second fixed electrode including a second shifted portion shifted by a second predetermined distance between the first tangential line and the third tangential line with respect to the first fixed electrode.