| 摘要 |
<p>The invention relates to an irradiation device which is provided with a series arrangement of a radiation source (5) of ultraviolet radiation, a first switch (3) and a second switch (4). …<??>According to the invention, under normal conditions the radiation source (5) is switched on and off by the first switch (3). The second switch (4) - which is practically not subjected to wear - is operative only if the first switch (3) fails. By means of a simple circuit (7, 20, 17, 6; R), it is then avoided that the defective device can be switched on again.</p> |
