18985100. TIME-OF-FLIGHT DEVICE USING TWO LIGHT MODULATION FREQUENCIES IN TWO MEASUREMENTS (PixArt Imaging Inc.)
TIME-OF-FLIGHT DEVICE USING TWO LIGHT MODULATION FREQUENCIES IN TWO MEASUREMENTS
Organization Name
Inventor(s)
YUEH-LIN Chung of Hsin-Chu County TW
TSO-SHENG Tsai of Hsin-Chu County TW
TIME-OF-FLIGHT DEVICE USING TWO LIGHT MODULATION FREQUENCIES IN TWO MEASUREMENTS
This abstract first appeared for US patent application 18985100 titled 'TIME-OF-FLIGHT DEVICE USING TWO LIGHT MODULATION FREQUENCIES IN TWO MEASUREMENTS
Original Abstract Submitted
There is provided a distance measurement device including a light source, a light detector, a time control circuit and a processor. In first measurement, the time control circuit controls the light source to illuminate at a low modulation frequency, and the processor calculates a rough flying time according to a first detection signal of the light detector to determine an operating phase zone and a delay time. In second measurement, the time control circuit controls the light source to illuminate at a high modulation frequency and causes a light driving signal of the light source and a detecting control signal of the light detector to have a difference of the delay time, and the processor calculates a fine flying time according to a second detection signal of the light detector.