A switch actuator, a mobile device, and a method of actuating a switch by a presence of a heat emitting part

摘要

A switch actuation device (100) has a presence sensor (1) for actuating a switch (103) by a presence of a heat-emitting part (115) on the presence sensor (1), the presence of a proximity phase (31), in which the part ( 115) approaches the presence sensor (1), a waiting phase (44), in which the part (115) remains in the vicinity of the presence sensor (1), and a removal phase (41), in which the part (115) from the presence sensor ( 1) is to be moved away, the presence sensor (1) being set up to detect heat emitted by the part (115) by means of at least one pixel (21 to 24) having a thin film of pyroelectric material and one signal per pixel (21 to 24) (51 to 54) with signal swings (56, 57) according to the temporal intensity profile of the heat detected by the pixel (21 to 24), a signal evaluation unit (101) with which the chronological sequence and the shape of the signal deflections (56, 57) the approach phase (31) and the distance phase (41) can be determined, and an actuator (104) which is controlled by the signal evaluation unit (101) and, as soon as the approach phase (31), the waiting phase (44 ) or the removal phase (41) is determined, the switch (103) is actuated.