US Patent 7199703 Seatbelt use indicating apparatus and method

A simple and inexpensive seatbelt use indicating apparatus that allows easy recognition of the states of use/non-use of the seatbelt is provided. The apparatus includes a design figure that implies whether the seatbelt is used or not, and a lamp portion that indicates the use or the non-use of the seatbelt of each seat location via the color of light. The lamp portion causes two-color LEDs to glow corresponding to indications of the seat locations in accordance with the on/off states of buckle switches provided in seatbelt devices. Whether a seatbelt is used or not is indicated by changing the color of light of a corresponding LED, that is, changing the fashion of indication. The glow of LEDs is changed between red and green. Red glow of an LED indicates that a corresponding seatbelt is used, and green glow of the LED indicates that the corresponding seatbelt is not used.