Abstract: The invention proposes a device (20) comprising an actuation ball (30, FIG. 13), a casing (22) that surrounds the ball, elements (56) for guiding the ball in rotation, a first detection light source (LS1) for emitting at least one detection beam (EL1), and a detection sensor (126) to capture at least the light (RL1) originating from the lit zone of the ball (30), characterized in that the first light source (LS1) emits an invisible light (EL1), and in that the device comprises a second light source (LS2), distinct from the first light source (LS1) for illuminating the ball (30) that emits a visible illumination light (EL2) towards the ball (30).

Abstract: The invention proposes a device (20) comprising a ball (30), rolling elements (56) for guiding the ball (30), a light source (112) for emitting at least one incident light beam through a window, a sensor of the image of the illuminated zone of the ball (30), characterized in that the device (20) comprises at least one validation switch (60-94-96) on which the user is likely to act by depressing the ball (30) which acts on the validation switch by means of a rolling element (56) that is interposed axially between the ball (30) and the member (60) for triggering the switch.

Abstract: The invention proposes a device (20) comprising an actuation ball (30, FIG. 13), a casing (22) that surrounds the ball, elements (56) for guiding the ball in rotation, a first detection light source (LS1) for emitting at least one detection beam (EL1), and a detection sensor (126) to capture at least the light (RL1) originating from the lit zone of the ball (30), characterized in that the first light source (LS1) emits an invisible light (EL1), and in that the device comprises a second light source (LS2), distinct from the first light source (LS1) for illuminating the ball (30) that emits a visible illumination light (EL2) towards the ball (30).