Projector
| of these articles is occupied with the projector as projection equipment. For the mathematical technical term see projection (mathematics). |
A projector (lat. proicere „forward-throw, throw “) are optical equipment, which produces an increased picture of an article on a Projektionsfläche. Practical applications e.g. are. visualizationof pictures, diagrams or data in presentations, the demonstration of computer programs, replacement for a board, film demonstrations. Special technical applications e.g. are in the optical 3-D-Messtechnik. in the strip projection or with the light cut procedure.
Table of contents |
technology
it essentially gives the three in the following presented kinds of projector. All three contain a very bright shining means and a projection objective as substantial optical elements, with their assistance on one in more suitablyDistance standing adjusting wall an increased image of the medium is produced. Partially the pictures are distorted.
overhead projector
overhead projectors are for example the still-picture projector or the daylight projector. Overhead projectors through-radiate a medium, like a slide or a printed on or described plastic foil. Similar film projectors orReaders for reading from microfilms have the same function mode. If particularly bright black-and-white projections are in demand, one uses applied metal masks in place of a dia. film on glass.
top illumination projector
the lighting projector is called also Episkop. A intransparentes medium like e.g. a book side is lit up and that scattered back light to the wall projects.
reflection projector
a very recent technology, which is used frequently in video projectors, uses the reflection of a ray of light at small mobile mirrors for the projection of pictures and films. The mirrors are on a microchip and become individuallyover a digital computer headed for. Each mirror has two positions. In the one reflects it the light to the illustration optics, so that the point in the projection appears bright. In the other one it reflects the light at the optics past and the point appears thus in the picturedarkly. An execution of this technology is called digitally Mirror DEVICE (DMD). With this technology can be projected not only fixed images but also videos or the display output of a computer.
history
already end 19. Century projectors were used, the painted glass plates onthe wall projected. With the spreading of small picture slides still-picture projectors enjoyed of increasing popularity. Only with manual, with automatic operation by means of a magazine the slides were later carried into the projector, through-radiated by a strong lamp and projected to the wall.
see also
Bibliografie
- Tümmel, harsh ore (1986): German run picture projectors for 35 - and 70-mm-Film: a catalog. Hrsg: Donation German Kinemathek, Berlin, out of print
