ABSTRACT

Automotive applications for automobiles continue to change as the market identifies new ways to use light-emitting and light-sensing devices. Optical devices have been used almost everywhere in the automobile, including in the engine compartment. Interior lighting is a prime location for light emitting diode (LED) lighting, given that most LEDs are directional lighting systems. The taillight would use an LED with a low-current mode for running and increase the current to enhance the light intensity for braking. Heat-related problems for most high-power LEDs are solved by reducing the current drive while providing substantial area lighting. Some additional possible functions that could use optical devices are the following: door ajar; trunk lid ajar; hood ajar; oncoming headlight sensor; external lights operative; oil contamination; short-range remote communication link; and long-range remote communication link. Door closure is an important feature for any automobile and optical slotted switches provide a high-reliability solution.