The first opto-mechanical system that functioned was breveted in 1884 by a
student named P. Nipkow. g4l20li
The first demonstration with the television system, made by Nipkow, was made
in 1925 by the Scottish inventor that is known as the inventor of the television,
John Logie Baird, and the first demonstration with a color television was made
in 1928 by the same Scottish inventor. Baird also invented the video disk in
1928, but it was commercially available only from 1978. The video disk is a
disk with pictures and sounds recorded on it , played by laser. It is a type
of compact disk. The video disk is chiefly used to provide commercial films
for private viewing. Most systems use a 30 cm/12 in rotating vinyl disk coated
with a reflective material. Laser scanning recovers picture and sound signals
from the surface where they are recorded as a spiral of microscopic pits.