| 摘要 |
An optical-electrical signal warning apparatus intended for fitting to, for example, railbound vehicles in order to observe variously coloured light signals, and which apparatus is configured with filters 7,8 or prisms intended to divide and pick up red and green light from a light signal device and to project this light onto light- sensitive cells 5,6 coupled in an electric bridge 12 configured with a sensor 13 for detecting the increase in the quantity of red or green light, in relation to the light of the surroundings, which is received for the light signal device and, should red light be present, for giving warning of this and, where necessary, effecting braking of the vehicle. <IMAGE> |
