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A video projector is an image projector that receives a video signal and projects the corresponding image onto a projection screen using a lens system. Video projectors use a very bright ultra-high-performance lamp (a special mercury arc lamp ), Xenon arc lamp , metal halide lamp , LED or solid state blue, RB, RGB or fiber-optic lasers to ...
Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, [ 1 ] but old analog projectors are still used at some places.
Early pioneers of LCD projection in Japan were Epson and Sharp, [8] which launched their own color video projector products in 1989. In 1989, Projectavision, Inc. was awarded the first Defense Advanced Research Projects Agency (DARPA) contract – for US$ 1 million – for proposing that the United States high-definition television (HDTV ...
6.5 inches: NovaTron: No : Fixed magnet: 200: Enhanced version of Model One with an IR remote control. Versions were available that could project a 10-foot (3.0 m) picture and could be ceiling mounted. Novabeam Model Two : Kloss: 1982: 6.5 inches: NovaTron: No : Fixed magnet: 200: Vertical configuration, with a periscope like mirror. Projects ...
Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.
The Nikon Coolpix S1000pj compact camera projecting an image using its built-in projector. 3M pocket projector Handheld. A handheld projector (also known as a pocket projector, mobile projector, pico projector or mini beamer) is an image projector in a handheld device.
For xenon arc lamps, a constant-current supply is used, which starts with a sufficiently high open-circuit voltage (between 5 and 20 kV, depending on lamp) to cause an arc to strike between the electrodes, and once the arc is established, the voltage across the lamp drops to a given value (typically 20 to 50 volts [5]) while the current ...
Industrial laser projectors have been on the market since the early 2000s. Laser projectors are mainly used as optical guidance systems. They enable working without templates in many manufacturing processes by showing directly on the workpiece how material needs to be positioned or mounted, so that the employee is led by manual or semiautomatic productional processes visually.