How To Clean Projector Lens And Which Lens Is Used In Projector?


By Arindam Roy

A projector is a device that projects images from a light source through a lens onto a surface, such as the walls of a room or onto an object. Projectors can create an image with any type of content, including slides, filmstrips, movies, live performance video and computer generated graphics.

A projector lens is particular to the size and shape to offer high quality resolution for the projected image. A dirty lens will not only cause distorted images but also potentially burn out the projector bulb prematurely. To avoid any of these symptoms it is imperative to regularly clean your projector lens and replace your lamp in order to maintain optimal use.

How to Clean a Projector Lens:

Take care in removing any dust or lint from the lens. Smooth lint picks such as Swiffer are recommended. Be careful not to scratch the lens as you remove particles with your tool. A clean lens will allow for a better viewing experience but before attempting this step, be sure to replace the lamp first. The lamp is one of the most important parts to maintaining your projector and has to be maintained on a regular basis for optimal performance. If the lamp is damaged, it will not only burn out sooner but also produce less light thus making the image appear darker. 3-4 hours of use typically is the time a lamp will last before needing to be changed.

Begin by positioning your projector lens in front of a window so you can see the image clearly. Most projectors do not have adjustments for correct positioning but some will allow you to rotate the lens with a Phillips screwdriver or similar tool.

Turn on your projector and with the lens in front of you, begin cleaning the lens by rubbing gently along the area using a lint free cloth or paper towel. Be sure to avoid touching any part of the interior glass surface as this could scratch when you try to clean it. Do not vigorously rub to avoid scratching the lens as you would ordinarily do with a cloth and paper towel.

After you have cleaned the lens, make sure to turn off your projector and place it on a level surface that has enough space for the back of the projector bulb. Remove the projector lamp from its holder and remove its old tungsten bulb with a Phillips head screwdriver or similar tool. Insert in new tungsten bulb where the old was removed.

If your project does not have an adjustment handle for positioning, simply repeat steps 3-5 until you are satisfied with the brightness of your images. At this point, clean off any remaining particles by wiping them away using another lint free cloth or paper towel.

Turn the lamp on again and adjust the lens until you see a clear image with no unwanted lines or distortion. Turn off the lamp and replace it in its holder.

Related article: How To Adjust Screen Resolution In Projector?: A Quick Fix Guide

The Projector Lamp:

By maintaining your projector properly, your projector will have a longer lifespan, greater performance and be able to create a clearer image. The bulb is one of the most important parts to maintaining your projector and has to be maintained on a regular basis for optimal performance. If the bulb is damaged, it will not only burn out sooner but also produce less light thus making the image appear darker. 3-4 hours of use typically is the time a lamp will last before needing to be changed.

Related post: How To Connect Ipad To Projector?: Expert Tips

How to Replace a Projector Lamp:

When replacing your projector lamp, be sure to observe the following steps and closely inspect the new lamp for defects. Inspect the power cord for signs of wear or damage. Inspect all other parts for defects such as scratches or chips in the plastic cover before you attempt to remove the bulb. Be careful not to spill any water on the lamp but be sure not to touch any part of it as this could cause damage due to corrosion if placed in water. If you are unsure about your ability to complete this task, have a professional do it for you as it can expose them to a high risk of electric shock.

To replace your lamp, place the new projector lamp in the same position as the old one and push down on it. Do not over- tighten it as you may break it. If necessary, use a T10 or T25 Torx wrench to remove any screws which secure the lamp cover. Insert new bulb in place of the old and tighten all screws but do not over-tighten or you may break them. Reconnect power cord to the back of your projector and test out your projector again, using Steps 1-5 in this article. If necessary, repeat the steps in this article to clean your projector lens as well.

Read here: How To Connect Laptop To Projector With HDMI: All You Need To Know

Owner’s Manual Lamp Replacement:

If you are unsure about your ability to complete this task, have a professional do it for you as it can expose them to a high risk of electric shock.

To replace your projector lamp, place the new projector lamp in the same position as the old one and push down on it. Do not over-tighten it as you may break it. If necessary, use a T10 or T25 Torx wrench to remove any screws which secure the lamp cover. Insert new bulb in place of the old and tighten all screws but do not over-tighten or you may break them. Reconnect power cord to the back of your projector and test out your projector again, using Steps 1-5 in this article. If necessary, repeat the steps in this article to clean your projector lens as well.

To ensure you get the most out of your LCD or DLP projection system, we recommend cleaning the LCD or DLP (digital light processing) panel at least once per month. To do this, simply take a microfiber cloth and clean both sides of the panel. A dirty panel could cause poor picture quality and incorrect colors on your screen.

Relevant reading: How To Connect Projector To Laptop & Windows 7?- Explained

Which Lens is Used in Projector?

There are many types of projectors available on the market today. There are film projectors where you put your own film rolls in and plug them into the projector or there are digital projectors like LCDs that use groups of lenses called an array (which creates different effects). The most common lens is the SLR (single lens reflex) which consists of three pieces, an objective lens, an erector system, and a projection lens.

The objective lens gathers the incoming light from the film into a single focal point. The projection lens then projects the light onto a screen or wall. The erector system is responsible for keeping everything in focus. At the other end of the spectrum are LCD projectors that use arrays made up of specific lenses to create the effect you desire. These usually consist of about five to eight lenses and each one controls a certain amount of light producing various effects like screen effect, point light source and iris effect. The exact make-up of the array depends on what the projector is trying to do.

The first lens in the array is going to be a positive lens that has a large focal length. The light will pass through this lens and then through a negative lens, which will give it more focus, before passing through another positive lens to create a certain amount of spread or diffusion. The following lens will have an inverted group of lenses like those before it and may be concave or convex depending on if you want to create more spread or diffusion. The next two lenses will control the amount of light going through each one by using different sizes and compositions. The last lens in the array will consist of a positive lens that is smaller and more compact to produce the final image.

 

 

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