ALEXANDRIA, Va., June 6 -- United States Patent no. 12,281,778, issued on April 22.
"Projection device with dynamic light effect" was invented by Jiangcan Fu (Dongguan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A projection device with dynamic light effect is provided, which includes at least one LED light source, a condensing lens, at least one external projection mono-convex lens, and further includes at least one filter. The filter is located between the condensing lens and the external projection mono-convex lens, an out-light surface of the condensing lens is provided with a first ripple. An upper and/or a lower surface of the filter are provided with a second ripple; being refracted by an in...