| 摘要 |
An eye protection apparatus includes a sensor adapted for sensing the presence of a person within a predetermined distance range in front of a monitor and outputting a pulse signal, an amplifier unit connected to the sensor for receiving the pulse signal and outputting an amplified signal, a comparator connected to the amplifier unit to receive the amplified signal, a MPU connected to the comparator, and an alarm circuit connected to the MPU. The comparator compares the amplified signal with a predetermined signal, and sends a result to the MPU; the MPU outputs a control signal according to the result to the alarm circuit, and the alarm circuit controls power to the monitor.
|
