NEW projector from INDIA

[bishnu.bhatta]

Originally Posted by aramosfet

I enquired about the lexan at a place near bvk iyengar road. he said it'll cost about 300-350 per Sq foot. but he didnt have a readily available piece for me. I'm sure if we search nearby shops we should be able to get it.

ya then we can go for it...One more thing...you can have a separate enclosure with fans and heatsinks installed esp for the bulb...this way you can reduce the size of the projector...

or we can go for a mirror (reflection) based projector in which the lower compartment contains the bulb and other electical circuitary and the upper portion contains the lens setup....see the attached image

[bishnu.bhatta]

All,

One useful excel attached......very useful during box design


Bishnu

[aramosfet]

Originally Posted by bishnu.bhatta

ya then we can go for it...One more thing...you can have a separate enclosure with fans and heatsinks installed esp for the bulb...this way you can reduce the size of the projector...

or we can go for a mirror (reflection) based projector in which the lower compartment contains the bulb and other electical circuitary and the upper portion contains the lens setup....see the attached image

Yea i've seen this design from drtsolutions.com but i feel this is possible only if the lcd is a small one. The one in the image is about 7" i think. but mine is a 17" lcd also we'd have search for front surface mirrors.

[yogender]

hi aramosfet

does lexan blocks uv rays tooooo...

[aramosfet]

Originally Posted by yogender

hi aramosfet

does lexan blocks uv rays tooooo...

from Lumenlab forum
UV, IR, Reflectors and Heat Shields
So you have figured out what light kit you are going to use. Now you need to make sure that light gets to the monitor, but the heat doesn't.

Heat Shields These are an important component of every projector. Heat shields are installed between the bulb and the first fresnel lens to help block heat from getting to the fresnel and monitor.
XL10: This is a UV blocking lexan. This is probably the most common method for blocking UV light from the bulb and providing a heat shield for the rear fresnel and monitor. Most people get this from their local Home Depot and it usually costs around $10. The main advantages of XL10 are that is cheap, blocks UV, and can easily be cut to the needed dimensions at your own home. Just make sure when framing the lexan to leave a little expansion room for when the lexan is heated.
Tempered Glass: Other members use tempered glass as their heat shield. Since the tempered glass doesn’t block UV, a filter must be purchased from Lumenlab to block UV. Another hassle is you have to go to the glass store and have them cut it to size for you, so you better know the exact dimensions of your box. The advantages of tempered glass are that it doesn’t bow when heated, and it blocks heat a little better.

So i guess lexan blocks UV. Not sure how effective it is for IR....

[bishnu.bhatta]

Originally Posted by aramosfet

So i guess lexan blocks UV. Not sure how effective it is for IR....

Best way is buy a MH on which UV protection is written.Almost all good brands(philips,OSRAM) have it.These block almost 90% of UV.Don't use the bulb if the outer shell is broken or cracked.Don't go for china made MH.....Alternatively, use Lakme UV protection cream while watching movies in your projector.

[aramosfet]

Originally Posted by bishnu.bhatta

Best way is buy a MH on which UV protection is written.Almost all good brands(philips,OSRAM) have it.These block almost 90% of UV.Don't use the bulb if the outer shell is broken or cracked.Don't go for china made MH.....Alternatively, use Lakme UV protection cream while watching movies in your projector.

Then we'll go for tempered glass... do you know any shops where they sell tempered glass cut to our requirements. How can we differentiate between normal/float glass and tempered glass?

[yogender]

I am also making a pj using

1. 15.6" LG lcd Model No. W1643c
2. 400 watt osram metal halide lamp
3. 74mm dia reflector.
4. 74mm dia condensor lens focal length 200mm.
5. 450mm focal length Quad element lens

now searching for the fresnel lenses 500mm & 220mm

parts of my light gate

[aramosfet]

Originally Posted by yogender

I am also making a pj using

1. 15.6" LG lcd Model No. W1643c
2. 400 watt osram metal halide lamp
3. 74mm dia reflector.
4. 74mm dia condensor lens focal length 200mm.
5. 450mm focal length Quad element lens

now searching for the fresnel lenses 500mm & 220mm

parts of my light gate

Nice work, can you tell me where did you get the quad element lens and how much did it cost you?
thanks.

[thotaka]

Originally Posted by bishnu.bhatta

2402 for a triplet is too costly.You can search in mumbai locally... or contact lensel pune, from where you can pickup personally on weekend.Else you can ask one of ur friend to collect it from allied(i got it for 1600 without tax,vat,bill) and courier it to you...by that way it will cost you 1600+200(max---courier charges).

Thanks Bishnu for this input. I spoke to Mr. Lingaraju of optics & Allied and managed to get the lens for 1800 bucks (1600 + 50 for packaging + 150 for couries)!!

Lensel's response time seems to be way too long !