A video projector produces high temperatures while operating. But due to the thinness of the lens and the temperature that the device makes, is it possible for a projector lens to melt?
A projector lens can melt, especially if it has a plastic material. This material is susceptible to UV damage, has low scratch-resistance, and low blue light transparency. It also has a low melting point, causing it to melt when your projector heats up over time.
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True enough, high-quality plastic lenses have undergone a precise method of development for them to become more advanced. However, you cannot deny the fact that plastics still have their shortcomings. But Despite the factors mentioned above, you can prevent your projector lens from melting and other damages.
Sign that Your Projector Lens has Melt
Your projection equipment produces a high temperature as it works. Such is relatively standard. However, there are times when the projector lens can no longer hold the constant heat produced by the device. As a result, it melts, leaving you searching for what went wrong with your projector.
However, in an instance your projector’s lens melts, your device will show a physical indication.
If you see a brown spot from the image projected by your device, then there is a high chance that the heat has already melted the lens. But the brown spot could also mean another thing.
It can form when your lens has accumulated dust, which blocks the equipment projects’ light. It is possible that the fan has stuck from lack of lubrication, dust, or running the device for too long.
If you have cleaned your projector and the brown spot did not disappear, then the problem is most likely caused by a melted lens.
How to Prevent Your Projector from Overheating
Your projector heats up more than you think it does. Its lamp produces heat to create images projected on the screen. Apart from that, the screen also makes a lot of heat.
For that reason, your projector will no doubt overheat without proper circulation; your projector will no doubt overheat. Fortunately, there are several things that you can do to prevent that from happening.
- Clean your projector
Projectors rely on fans to emit warm air from the equipment and draw in cooler air. However, when dust particles and various debris get caught up on the fans or the vents where the projector spells out heat, it will not adequately cool itself down.
For this reason, you need to clean the projector from time to time. You can use a small handheld vacuum to remove the obstructions from the vents and the fans. This way, you will prevent your unit from overheating.
- The placement of your unit
Your projector’s placement often affects its temperature. When in use and placed on a tabletop, avoid any obstruction like books or papers near the vents to prevent proper air circulation.
After using the unit, make sure to let it cool before you place it in its enclosure.
- The room’s temperature
The temperature of the room where you are storing or using your device directly affects the temperature of your projector. If you use it in a hot room, it is likely to overheat because it will not draw in cool air. After using it for a while, the unit will become too hot and will shut down.
The Development of Projectors
Thanks to technology’s continuous advancement, you no longer have to worry about your projector lens melting. It is because there are now projectors that have no lenses. Instead, they rely on lasers to produce images.
Right now, several manufacturers offer video projectors that no longer have lenses. Such are called laser projectors. A laser projector works by casting changing laser beams on a screen. As a result, it can create moving images.
Apart from its picture quality, laser projectors last relatively longer than traditional lamps. One reason is that you no longer have to replace the bulb from time to time. That said, then it is safe to say that laser is the future of projectors.
But how do laser projectors work?
While it sounds futuristic, a laser projector does not have much difference compared to a traditional one. Just like the conventional projector, a laser projector also has a light source. The only difference is that its light comes from a laser and not from a lamp.
On laser projectors, the red, green, and blue lasers are defocused. The reason is that it needs to fill a whole LCOS, DLP, or LCD chip. The laser does not scan this chip, however. Instead, it replaces the lamps or bulbs that you can find in projectors with lenses.
Also, lasers are more beneficial than lenses; for one, a projector lens creates white light. However, it has to throw away most of this white light to produce the green, red, and blue lights.
On the other hand, a laser projector will only create the exact colors that the image you want to project requires. As a result, it uses less power. That means that if a traditional projector uses 300 watts to create the colors you need, a laser will only use a portion, 100 watts, for instance, to create more light.
Another benefit is that laser projectors have a longer life expectancy. For instance, Epson says that is LS10000 projector has 30,000 hours of lasers. (3)
Frequently Asked Questions
Why is there a brown spot on my projector?
The discoloration on your projector can mean two things. The first one is that your projector lens has accumulated dust that needs to be cleaned. On the other hand, the lens could have melted due to the high temperature that the device produces while in use.
If the second one happens, then you need to buy a new lens and replace your old one.
Why do projector lenses melt?
Lenses can melt due to overheating. During projection, many people try to block a part of the image by using a lens cover like books. However, when something is blocking the light from a projector, the element on which the light shines overheat.
It results in the lens melting or burn. Also, the lens may overheat due to the projected light, causing the device to malfunction.
How high should the projector’s temperature be to considered overheating?
Your projector produces a high temperature when working. It is entirely normal. However, there are some instances when the heat it produces is too much, causing it to overheat.
Most projectors automatically turn off when it has overheated. But to know for sure, very carefully touch the surface of your projector. If you feel like it is close to being too hot to touch, turn it off and unplug it immediately.
Moreover, Epson says that projectors should not produce heat above 95 F.
Projectors that have lenses have been advantageous for years. But as the technology develops, the science behind video projection also became better. This development gave birth to laser projectors.
Laser projectors are more durable compared to traditional projectors. For instance, you do not need to worry about your lens getting burnt or melted since laser projectors do not need them to create images. However, that does not mean that traditional lenses are no longer beneficial. That said, choosing what projector you want to use is for you to decide.
- Wikipedia The Free Encyclopedia, Projector, Wikipedia, https://en.wikipedia.org/wiki/Projector/ Accessed Apr 13, 2021
- Why Glasses are Important, BenQ, https://www.benq.com/en-ap/business/resource/trends/glass-lenses.html/ Accessed Apr 13, 2021
- Geoffrey Morrison, Why Are Lasers The Future (Of Projectors), CNET, https://www.cnet.com/news/why-lasers-are-the-future-of-projectors/ Accessed Apr 13, 20214. Epson File Support, Epson, https://files.support.epson.com/docid/cpd5/cpd56239/source/basic_use/tasks/projector_turn_on_laser_power_switch.html/ Accessed Apr 13, 2021
Jason is a home theater expert with over 10 years of experience in setting up home cinema rooms and systems. What started out as a hobby soon transformed him into an authority in the audio-visual field. He is passionate about providing readers with accurate and up-to-date information on the latest audiovisual technologies and their applications for home theaters. Read more about Jason.