Apparatus comprising a movable object and a device for detecting a movement of the object, input device including the apparatus, and method of operating the apparatus

Apparatus (1) comprising a primary coil (L1), an object (3) movable relative to the primary coil (L1), and a device (10) for detecting a movement of the object (3) relative to the primary coil (L1),

• wherein this device (10) comprises an electrical resonance circuit (11) and at least one secondary coil (L2) with one or more coil windings,
• wherein the primary coil (L1) has one or more windings and is part of the resonance circuit (11), which also comprises at least one capacitor (C1),
• wherein the secondary coil (L2) is short-circuited (12),
• wherein the primary coil (L1) and the secondary coil (L2) are inductively coupled via a core,
• wherein either the core and the secondary coil (L2) are arranged on or in the movable object (3) or the secondary coil (L2) is arranged in a stationary manner relative to the primary coil (L1) and only the core is arranged on or in the movable object (3), so that, during the movement of the object (3), there is a relative movement between the core and the secondary coil (L2) on the one hand and the primary coil (L1) on the other hand, or between the core on the one hand and the secondary coil (L2) and the primary coil (L1) on the other hand, and this relative movement changes the strength of the inductive coupling between the primary coil (L1) and the secondary coil (L2) and thus at least one physical variable of the resonance circuit (11),
• wherein the device (10) for detecting a movement of the object (3) relative to the primary coil (L1) comprises a measuring device for detecting and/or processing at least one physical variable of the electrical resonance circuit (11), which variable changes during the movement of the object (3) between a first position and a second position, and outputs at least one electrical signal that is dependent on the change in the physical variable.