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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 of projectors can project the image directly, by using lasers .
Phantasmagoria was a form of horror theater that used one or more magic lanterns to project frightening images, especially of ghosts. Showmen used rear projection, mobile or portable projectors and a variety of effects to produce convincing necromantic experiences. It was very popular in Europe from the late 18th century to well into the 19th ...
The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope , which is capable of projecting images of both ...
Fischer projection, a two-dimensional representation of a three-dimensional organic molecule; Haworth projection, a way of writing a structural formula to represent the cyclic structure of monosaccharides
In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
Closely associated art forms are projectors, 3-D projection, multi-media, video art, and photography where light technology projects images rather than using light as the medium. Large light festivals and events have helped to develop the use of light on large canvases such as architectural facades, building projections, the flood lighting of ...
A stereopticon is a slide projector or relatively powerful "magic lantern", which has two lenses, usually one above the other, and has mainly been used to project photographic images. These devices date back to the mid 19th century, [ 1 ] and were a popular form of entertainment and education before the advent of moving pictures .
All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.