ALEXANDRIA, Va., March 17 -- United States Patent no. 12,578,222, issued on March 17, was assigned to SEIKO EPSON Corp. (Tokyo).
"Laser interferometer" was invented by Kohei Yamada (Shiojiri, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A laser interferometer includes: a laser light source configured to emit first laser light; an optical modulator including a vibration element and configured to modulate the first laser light using the vibration element and generate second laser light including a modulation signal; a light receiving element configured to receive third laser light including a sample signal generated by the first laser light being reflected by an object and the second laser light, and o...