ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,549,914, issued on Feb. 10, was assigned to Goertek Inc. (Weifang, China).
"Method for displacement measurement in a driver and speaker" was invented by Frederik Skovgaard (Shandong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for displacement measurement in a driver and a speaker are disclosed. The method comprises, choosing a stationary position for fixing an optical sensor inside or outside the driver, placing the optical sensor by using the stationary position, wherein the optical sensor is in line-of-sight to a moving part of the driver and faces the moving part; receiving, by the optical sensor, light reflected by or transmitting...