ROAD SIGN DEVICE AND SPONTANEOUSLY EMITTED LIGHT SIGN SYSTEM USED FOR THE DEVICE

摘要

A road marking device of the present invention comprises: a tubular, bottomed casing which has an open top end; a cover mounted over an opening in the casing and having a window; a self-luminous marking system composed of a condenser housed in the casing, an illuminant which emits light by receiving a power supplied from the condenser, and a circuit for driving the illuminant; and a transparent element which transmits and outwardly radiates the light emitted from the illuminant. The transparent element is fixed between the cover and the casing which cooperatively hold a periphery of the transparent element, with a part of the transparent element protruding outwardly from the window in the cover. In a self-luminous marking system, an LED is utilized without application of voltage so as to detect the quantity of light in the road environment and to generate an electromotive force in response to an incident light. Based on the electromotive force generated by this LED, the drive of a display LED is controlled.