A collection of infrared remote control devices in my house. The Verizon FIOS remote gets the most use. (Photo by author). |
This later version of the ultrasonic remote, the Zenith Space Commander 600, was sold with color television sets between 1965 and 1972. (Via Wikimedia Commons). |
Figure one of US Patent No. 2,903,575, "Control System," by E. J. Polley, September 8, 1959. I've highlighted the photocell locations in red. (Via Google Patents). |