| 摘要 |
The invention relates to a portable optical signalling device, particularly an item of clothing or a flag or a torch, containing: a signalling component that can be switched between an initial state and a second state, there being a visible difference between the first and second states of the signalling component, one or more sensors for determining the position of the signalling device or its signalling component and/or variables derived therefrom, and a control means linked to the signalling component and the sensor or sensors, such control means being designed to switch the signalling component between its first and second states in response to a change in the position and/or the variables derived therefrom being determined by the sensor or sensors. |
