The Advent VideoBeam is a big-screen

television Television, sometimes shortened to TV, is a telecommunication medium for transmitting moving images and sound. The term can refer to a television set, or the medium of television transmission. Television is a mass medium for advertisin ...

that was invented in the 1970s by

Advent Corporation Advent Corporation was a consumer audio and video hardware company founded in Cambridge, Massachusetts by Henry Kloss in 1967. It closed in 1981. The name came from the legal description ''the advent corporation (placeholder), advent corporation' ...

, founded by Henry Kloss. Both picture and sound are projected from the television's

projector A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types ...

base towards a curved screen, where they are reflected back towards the viewer. It is a

plug-and-play In computing, a plug and play (PnP) device or computer bus is one with a specification that facilitates the recognition of a hardware component in a system without the need for physical device configuration or user intervention in resolving reso ...

system, which means it has few adjustments, to make it easier to install. In 1978, its advertised sale price was $3,000.

Characteristics

* 7-foot screen (51.5" x 68.5") * 180 watts power consumption * Focal distance fixed at 100" * Projection technology:

Cathode ray tube A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms ( oscilloscope), pictu ...

with rear-facing 3" phosphor screen and

collimating A collimated beam of light or other electromagnetic radiation has parallel ray (optics), rays, and therefore will spread minimally as it propagates. A perfectly collimated light beam, with no beam divergence, divergence, would not disperse with di ...

mirror * Good quality projection * Clear, well-defined, and bright * Easy to install

References

{{reflist Television technology