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-   -   XGA Projector, Unique Folded Design, Ceiling Mounted, Long Throw (https://www.diyaudio.com/forums/diy-projectors/71758-xga-projector-unique-folded-design-ceiling-mounted-throw.html)

ramkishan 14th January 2006 10:36 PM

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.

v1d9uy 14th January 2006 11:07 PM

unique ... no small simple design yes

ramkishan 15th January 2006 01:58 AM

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

ramkishan 16th January 2006 04:10 PM

Pictures of Projector and Screen Shots
 
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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

ramkishan 16th January 2006 04:10 PM

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Other pictures are

ramkishan 16th January 2006 04:10 PM

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Fig. 1 - Projector Front View

ramkishan 16th January 2006 04:10 PM

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Fig. 2 - Projector Front View, bottom half open, upper half containing lens can also be lifted so that all elements inside can be adjusted

ramkishan 16th January 2006 04:10 PM

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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

ramkishan 16th January 2006 04:10 PM

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Fig. 4 - Screen shot from an Indian movie, 10 feet wide

ramkishan 16th January 2006 04:10 PM

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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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