scanning disk

noun

, Television.

1. (in mechanical scanning) a disk with a line of holes spiraling in from its edge, rotated in front of a surface so as to expose a small segment as each hole passes before it for transmitting or reproducing a picture.

Word History and Origins

Origin of scanning disk¹

First recorded in 1925–30

Example Sentences

A television scanning disk looks over the grey shadows piece meal, lets them illuminate three photo electric cells.

From Time Magazine Archive

Lenses combine those col ors and a second scanning disk synchronized with the first paints a colored x-ray image on a screen.

From Time Magazine Archive