| 摘要 |
Seat switches for detecting the presence and absence of an occupant in the seat (22) of a vehicle (16) are commonly used on industrial and commercial vehicles. It is desirable that the control signal produced by such seat switches be responsive only to the presence and absence of the vehicle occupant, and be relatively simple, rugged, and inexpensive. The instant invention includes an emitting device (12) for directing a source of coded radiant energy across a vehicle seat (22), and a detecting device (14) for receiving radiant energy, including a portion of the coded radiant energy in response to the seat (22) being vacant. The detecting device (14) produces an electrical signal in response to the received radiant energy. An electrical circuit (34) produces a control signal only in response to the detecting device (14) receiving the coded radiant energy. |
