Laserfilm

Laserfilm was a videodisc format developed by McDonnell-Douglas in 1984 that was a transmissive laser-based playback medium (unlike its competitor, LaserDisc, which was a reflective system).

It worked by having the laser shine through one side of the disc to a receiving sensor on the other side, where the beam of the laser would be interrupted by a spiral of small dots on the disc.

The disc was made out of ordinary photographic film (hence the format's name), which was mounted in a caddy for playback, much like the RCA Selectavision CED and VHD videodisc systems.

Laserfilm players were chiefly manufactured in Japan by Sansui on an OEM basis to McDonnell-Douglas' specifications and branded with their logotype, and weren't marketed successfully outside the company.

The Laserfilm format was originally based on an earlier videodisc format called ARDEV, developed by a company of the same name which was originally a subsidiary of Atlantic Richfield until 1981.