| 摘要 |
<p>A protective helmet (1; 101; 201) having a shell (2; 102; 202) and an inner padding (3; 203) is provided with a luminescent element (8) which can be excited by alternating current at a predetermined frequency; the luminescent element (8) is connected for operation to a power supply circuit (20), comprising a source of direct current electrical energy (18) and a switch means (19), by means of an electronic driving circuit (16) capable of controlling the conversion of the said direct current into the said alternating current. <IMAGE></p> |
