Lamp Bulb

Lamp Bulb

Introduction

Purpose of this White Paper

The purpose of this paper is to provide a vision the current general market the projector lamp, including the emergence of the UHP lamp, compatible lamps, specialized distributors and light conditions underlying economic.

This document is divided into sections. The main ones lamp technology and economic factors. These are followed by a appendix and a glossary.

Lamp technology

Overview

The lamp is the main component of the lighting system in a projector. Usually accessible behind a door on the projector so that it can be replaced. Sometimes, a projector with two lamps, which can be used simultaneously, or one can take over when the other does not.

Most common projectors use lamps metal halide lamps of ultrahigh pressure (UHP), variants of UHP and, in large projectors, xenon lamps. Although xenon lamps are smaller than those of film projectors, using the same technology. Xenon lamps, of course, better color rendition than the metal halide lamps, which are red deficient, but not as energy efficient and do not last as long.

What I call a lamp is actually a lamp module. It consists of a bulb and a reflector housing, electrical contacts to receive.

The reflector

The reflector projects the light bulb in a projector component integrators. This takes the form of a fly-eye lens (called because its surface is composed of multiple lens elements in a rectangular array, much like an insect's compound eye) or a tube light, it is a glass rod or rectangular tube rectangular mirrors. It aims to homogenize and shape the beam of light to ensure uniform illumination of each pixel with light lost minimal.

The reflector design is very important because it has to collect as much light from the bulb as possible. Looks like a hemisphere, but is generally elliptical in cross section.

Reflectors vary in complexity. For example, a fourth parabolic reflector is much more accurate, and even distribution of light waves emitted from a focal point of a power of second dish. Fourth-order parabolic reflectors, however, are more difficult manufacturing precision.

Then there are the elliptical reflectors. One of the properties of an ellipse has two foci is that outbreaks (o). If you have a source light into a focus of an ellipse, the light beams that hit the ellipse are reflected so as to meet in the second approach (see diagram downloading the white paper tekgia.com real).

This concentrates the light of a lamp in a lens so that you get as much light as possible over to the screen. If the source is larger a single point, some of the beams do not come just at the first outbreak, for with it until it is missing the point of second and lost focus. Moreover, most of the ellipse (ie, the greater the distance between the two focal points) the higher the point of light will be at the second focus.

Bulb size and street beams

As expected, stray beams cause problems. The light is channeled through the lens to strike other surfaces inside the projector, reduce screen brightness, and heat gain in the spotlight. You can also get annoying and distracting light leaks through holes in the projector.

By Furthermore, stray light can find its way back to the point, and end up hitting the screen in places where it should not. This impacts the image contrast. Instead of show solid black, diffuse light gray to lighten the black.

An interesting solution to the problem of stray light beam is to reduce the font size light. The ideal source would be infinitely small. Any loss would be infinitely small light. There would be no appreciable loss of brightness (luminance or -- amount of light produced).

Thus, the aim has been to make a small projector lamp as possible.

This leads to the lamp yes. Metal halide lamps spark across a gap filled with gas to create light. The differences are usually 2 mm or more. Such measures can cause stability problems of color and luminance. They also tend to deposit materials such as tungsten lamp while it is on, the brightness of a sudden reduction in the lamp life.

In 1995, Philips introduced the ultra high pressure lamp (UHP). These lamps are metal halide lamps. In his Instead, use an arc-shaped pure mercury vapor at very high pressure. The pressure is typically more than 200 atmospheres or 200bar (an automobile tire is generally low 3bar).

The arc gap tends to be much smaller than those of metal halide lamps, typically 1.3 to 1.0 mm in diameter. This light source is much smaller more efficient. A 100-watt UHP lamp in a projector can deliver more light to the screen of a lamp 250 watt metal halide.

Other influential factors

I will briefly cover other factors that are influential in the design and manufacture of a projector lamp.

The reflector must be designed to give a uniform field of light (no access point in the center), the glass of the lamp has to be as transparent as possible, and filament as free as possible of impurities (which affects the color temperature of the output).

Then there is the layer dichroic reflector. This allows infrared light (heat) to pass through while reflecting visible light, which reduces the amount of heat shot through the LCD element (or in the mirrors if the projector DLP DLP is a one).

Then there are the materials used. A projector lamp is of a material resistant to high pressure and high temperature.

To view the sections of Economics (market conditions, investment, supply chain, Lamps compatible) and Appendix (lamp life, the difference between a light bulb, a lamp, a housing and a module), download the White Paper on real Lamps tekgia.com for projectors.

Bob Wilkins, Tekgia (http://www.tekgia.com [http://www.tekgia.com/index.php]).

Download a White Paper on Projector Lamps: Projector Lamps [http://www.tekgia.com/product_info.php/products_id/3292].

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