| 摘要 |
<p>A horn or other vehicle device can be activated or controlled by attenuating light. A horn switch, or an optical switch, has a light source (1), light detector (2), and a pathway (3) for light extending through a void. The switches are activated by attenuating the light emitted by the light source. The light can be attenuated by at least partially obstructing the light or by modifying the orientation of either the light detector or the light source.</p> |
