Patent ID: 11906890
Assignee: HISENSE LASER DISPLAY CO., LTD
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 11:
12. The laser projection apparatus according to claim 11, wherein the sensor is further configured to output a detection current to the detection unit, the detection current satisfies:

IC=B×f(IF)×F(d),

where IC is the detection current, B is a reflectivity of the sidewall of the rotating shaft, f(IF) is a function of an output current and an input current of the sensor, F(d) is an efficiency function of the sensor, and d is a minimum distance between the sensor and the side wall of the rotating shaft; and
the detection unit is further configured to generate the frequency signal with a level changing constantly according to a frequency of change of a magnitude of the detection current.