XGA Projector, Unique Folded Design, Ceiling Mounted, Long Throw - diyAudio
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Old 14th January 2006, 11:36 PM   #1
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Default XGA Projector, Unique Folded Design, Ceiling Mounted, Long Throw

We have built a LCD projector, XGA after studying various web sites and forums. For pictures of projector and Screen Shot, please visit our own web page by clicking the link - www.drtsolutions.com/Projector.htm
The projector uses long throw lens and is mounted at ceiling height 22 feet from the wall used as screen for 10feet wide image. It has all inputs including component video, VGA, S video, TV Tuner and easy keystone correction. It uses 13.3" XGA LCD, Metal Halide lamp 400W, 135mm triplet projection lamp and two small exhaust fans etc. Our study of various forums revealed that design of the enclosure should be such that it should be possible to adjust all the elements easily with precision and hence I made the enclosure with front opening for such adjustments and the projection lens is also mounted with similar adjustments. Overall results are excellent. The cost is nearly 20% of the equivalent commercial version with added advantages of a very cheap lamp, much longer lamp life, much longer LCD life due to enough ventilation etc. The only disadvantage is size but we have placed it on an almirah, top of which was already vacant. Hence the projector does not require any special mountings or space.
This project was initiated as our 29" TV was moved out and one of the rooms fell vacant. While studying alternatives, I studied diy projector sites, came across www.tomshardware.com and started building such projector after buying a junk overhead projector (OHP) from a local disposal shop for Rs. 1400=00 (i.e. $30). The metal halide lamp 400W was kept inside the metal enclosure of the OHP. The exhaust fan and the top glass remained as in OHP. The fresnel lens was taken out and mounted on four long screws. All trials and settings were made using a transparency of our own photographs. *Having achieved a satisfactory 10 feed wide image, we obtained a 13.3" LCD monitor. Taking out the screen was a challenging task. Finally we could do so after obtaining a special flat ribbon cable. LCD screen was placed on top of the fresnel lens. We got very good results but the projector was occupying centre of the room at a distance of 10 feet from the screen. Then we obtained the long throw lens, a reflecting mirror was mounted at 45 deg. long throw lens was placed in a wooden assembly having adjustments shown in the pictures. Thus the distance was increased to 22 feet from the screen with the projector placed on an almirah. In the meantime I studied various other sites and accordingly the unique design of the enclosure was developed. Now my grandchildren and other family members, relatives and friends are enjoying the theatre like atmosphere in the said vacant room..
Our web page www.drtsolutions.com/Projector.htm is constantly updated based on queries in different forums.
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Old 15th January 2006, 12:07 AM   #2
v1d9uy is offline v1d9uy  United States
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unique ... no small simple design yes
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Old 15th January 2006, 02:58 AM   #3
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Uniqueness is on account of most easy adjustability of all elements. Further uniqueness is innovative front opening. Many of the new comers experience difficulties in getting image due to not having such adjustments. Further due to such adjustability, the projector can be placed in any location and optimized. Such design was developed after studying problems expressed in various forums relating to diy projectors
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Old 16th January 2006, 05:10 PM   #4
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Default Pictures of Projector and Screen Shots

The pictures of our Projector and Screen Shots are attached. by using the unique front opening all the elements inside can be easily adjusted and optimised. The projection lens is also adjustable to an fro as well as up and down. In one of the picture, the projector is shown to be placed on top of an almirah. The wall screen in the same room is 22 feet away. One of the screen shots is from an Indian movie. Two other shots are 3D pictures taken by me with my grand daughter standing in front of the screen. For more details on above, please visit our web page by clicking here:-
XGA Projector
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File Type: jpg fig. 8 - sona-3d2.jpg (33.7 KB, 519 views)
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Old 16th January 2006, 05:10 PM   #5
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Other pictures are
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File Type: jpg fig. 7 - sona-3d1.jpg (32.8 KB, 465 views)
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Old 16th January 2006, 05:10 PM   #6
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Fig. 3 - Long throw lens assembly, the lens can be easily adjusted to and fro as well as up and down
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File Type: jpg fig. 3 - long throw lens.jpg (13.2 KB, 460 views)
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Old 16th January 2006, 05:10 PM   #7
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Fig. 4 - Screen shot from an Indian movie, 10 feet wide
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File Type: jpg fig. 4 - screen image-1.jpg (26.8 KB, 456 views)
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Old 16th January 2006, 05:10 PM   #8
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Fig. 5 - Projector at ceiling height, placed over an almirah, opposite side is wall screen in the same room at a distance of 22 feet
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File Type: jpg fig. 5 - projector at ceiling height.jpg (42.7 KB, 482 views)
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Old 16th January 2006, 05:10 PM   #9
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Fig. 6 - wall used as screen opposite side of the projector at a distance of 22 feet, hence the room space is not disturbed at all
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Old 16th January 2006, 05:10 PM   #10
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Fig. 6 - Opposite wall at a distance of 22 feet used as screen in the same room does not disturb the space in the room as the projector is placed at ceiling height
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File Type: jpg fig. 6 - screen at the wall.jpg (35.9 KB, 420 views)
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