LED ROAD TRAFFIC SIGNAL LAMP

• Main Author: OCHIAI TARO
• Format: Patent
• Language: English
• Published: 19.01.2006
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; BLASTING; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HEATING; HUMAN NECESSITIES; HYGIENE; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO USESOR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS; LIGHTING; MECHANICAL ENGINEERING; MEDICAL OR VETERINARY SCIENCE; NON-PORTABLE LIGHTING DEVICES; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PHYSICS; PROSTHESES; SIGNALLING; SYSTEMS THEREOF; TRAFFIC CONTROL SYSTEMS; TREATMENT OR PROTECTION OF EYES OR EARS; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a LED road traffic signal lamp which hardly gives incompatibility to healthy people by performing, to a red or yellow LED signal lamp which confuses color-blind people, mark patterning by a chromaticity discriminable by the color-blind people from a fixed distance and causing no mixing discoloration to the whole body. SOLUTION: This signal lamp comprises red LED elements 3 circularly aligned on a circular printed board 2, and identification LED elements 5 aligned in this group of red LED elements 3 in X-shape. Therefore, color-blind people can discriminate the identification LED elements 5 even from a fixed distance. The chromaticity is set so as to cause no mixing discoloration to the whole body, or the luminance of the X-shape of the identification LED elements 5 is reduced, whereby healthy people can see the signal lamp with hardly feeling incompatibility similarly to a conventional red LED signal lamp, while the color-blind people can precisely recognize necessary information of lighting/extinguishing of the red LED signal lamp. COPYRIGHT: (C)2006,JPO&NCIPI