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White Paper On Projector Lamps
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Introduction
Reason for this white paper
The objective of this white paper is usually to present an breakdown of the latest projector lamp market, such as the emergence of UHP lamps, compatible lamps, specialist lamp distributors along with the underlying economic conditions.
This paper is divided into sections. The main ones are stored on projector lamp technology and the economic factors. These are followed by an appendix and glossary.
Lamp technology
Overview
The lamp could be the primary portion of the illumination system in a projector. It will always be accessible behind a door within the projector then it may be replaced. Sometimes a projector should have two lamps; they can be used while doing so a treadmill may take over in the event the other fails.
Most common projectors use metal halide lamps, ultra high pressure lamps (UHP), variants of UHP and, in larger projectors, Xenon lamps. Even though the Xenon lamps are smaller than those invoved with film projectors, they'll use a similar technology. Xenon lamps naturally achieve better colour reproduction than metal halide lamps, which are red deficient, nonetheless they aren't as energy-efficient plus they don't be as durable.
What I'm calling a lamp is in reality a lamp module. It has a bulb along with a reflector in the housing, with electrical contacts for receiving power.
The reflector
The reflector projects the sunshine through the bulb onto a factor in the projector called an integrator. This takes the form of either a "fly-eye" lens (so named because its surface is composed of multiple lens elements within a rectangular array, similar to the compound eye of an insect) or possibly a light pipe, aforementioned whether rectangular glass rod or perhaps a rectangular mirrored tube. Its purpose would be to homogenise and shape the sunshine beam to ensure uniform illumination of every pixel with minimal wasted light.
The appearance of the reflector is vital, mainly because it needs to collect as often light through the bulb as possible. It appears like a hemisphere but is normally elliptical or parabolic in cross section.
Reflectors vary in sophistication. One example is, a fourth-power parabolic reflector is much more accurate and even in its distribution of sunshine waves emitted from the focal point than the usual second-power parabolic. Fourth-power parabolic reflectors, however, tend to be hard to accurately manufacture.
There are the elliptical reflectors. One of several properties connected with an ellipse is the fact it's two focuses (or foci). When you have a light source at one focus associated with an ellipse, the light beams that hit the ellipse are reflected so they agree at the second focus (see diagram by downloading your whitepaper at tekgia.com).
This concentrates the sunshine coming from a lamp onto a lens in order that you get as much light as you can transported to the screen. In case your source is larger than a single point, several of the beams will not originate precisely with the first focus, and therefore find yourself missing the 2nd focus point and straying. Also, the wider the ellipse (meaning the greater the length involving the two focal points) the bigger the beam spot will likely be at the second focus.
Bulb size and stray beams of sunshine
Unsurprisingly, stray beams create problems. Light that isn't funneled with the optics will strike other surfaces from the projector, reducing brightness on the watch's screen, and increasing heat in the projector. It's also possible to get annoying and distracting light leaking through vents inside the projector.
Furthermore, stray light could find its long ago into the optics, and finish up striking the screen in places where it shouldn't. This impacts the contrast on the image. As opposed to showing solid black, the stray light will lighten the black into gray.
An appealing strategy to the challenge of stray light beams is always to limit the size of the sunshine source. The ideal source will be infinitely small. Any stray light can be infinitesimally small. There would be no noticeable lack of brightness (or luminance - how much light produced).
Hence the goal have been to produce as small a projector lamp as you can.
This takes us on the bulb itself. Metal halide lamps spark across a gas-filled gap to generate the sunshine. The gaps are usually 2 mm or larger. Such sizes can cause colour and luminance stability problems. In addition, they often deposit materials including tungsten for the lamp even though it is on, reducing brightness in early stages from the life of the lamp.
In 1995, Philips introduced the ultra underhand lamp (UHP). These lamps will not be metal halide lamps. Instead, they normally use an arc in a pure mercury vapor under quite high pressure. Pressure is commonly over 200 atmospheres or 200bar (a motor vehicle tyre is often under 3bar).
The arc gap is usually much smaller than those on the metal halide lamps, typically 1.3 to 1.0 mm across. This smaller source of light is a lot more efficient. 100 watt UHP lamp within a projector can deliver more light to the screen compared to a 250 watt metal halide lamp.
Other influential factors
I most certainly will briefly cover additional circumstances which are influential inside the design and output of a projector lamp.
The reflector should be engineered to provide a good field of sunshine (no hotspot in the center), the glass with the lamp should be as transparent as you can, plus the filament as free as is possible of impurities (they modify the colour temperature from the output).
Then there is the dichroic coating in the reflector. This will give infra-red light (heat) to give while reflecting visible light, thereby reducing the number of heat shooting through the LCD element (or for the DLP mirrors should your projector is usually a DLP one).
There are materials used. A projector lamp is made of material immune to high pressure and hot temperature.
To see the sections on Economics (Market Conditions, Investment, The provision Chain, Compatible Lamps) plus the Appendix (Lamp Life, The main difference Between a Bulb, a Lamp, a Housing as well as a Module), download the exact White Paper on Projector Lamps from tekgia.com.
Samsung SP-H03 Projector used in a front Room.MP4