| 摘要 |
A device and a method for displaying to a person moving on a course the elapsed time between two points on the course. Generally, the person would be on or in a mode of transportation, such as a race car. A retroreflective switch is attached to the car and includes a transmitter and a receiver. The transmitter emits an infrared light beam such that the light beam strikes a reflector adjacent the course when the car is on the course adjacent the reflector. The receiver includes a light detector that outputs a detection signal in response to detecting the reflected light beam from the reflector. A processor connected to the receiver receives a first detection signal as the car is adjacent a first reflector and receives a second detection signal when the car is adjacent a second reflector and determines the elapsed time between said first and said second detected signals. A display connected to the processor receives the elapsed time and displays it to the person driving the vehicle. A first reflector is disposed adjacent the course adjacent the first point on the course for receiving the light beam emitted from the transmitter and for reflecting the light beam back to the receiver. A second reflector is disposed adjacent the course adjacent the second point on the course and similarly aligned. To display lap time only a single reflector is disposed. The processor will compute, display, and record continuously, regardless of how many reflectors are used.
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