undream etc.
along time ago i had a met down on one of my projector projects. i use the two boards to keep my polvarizer intact with the lcd. now i got a problem with it(see picture below). but i think if i rout a 45 dreg. at the rectangle hole perimeter for the lcd,it might help the problem with the dim edges(just need to barrow a router. see im thinking some of you guys might have the same or simular problem with the housed in lcd setup(that why i kinda wanted to see a cut section drawing).
😀 😀 😀 😀
along time ago i had a met down on one of my projector projects. i use the two boards to keep my polvarizer intact with the lcd. now i got a problem with it(see picture below). but i think if i rout a 45 dreg. at the rectangle hole perimeter for the lcd,it might help the problem with the dim edges(just need to barrow a router. see im thinking some of you guys might have the same or simular problem with the housed in lcd setup(that why i kinda wanted to see a cut section drawing).
😀 😀 😀 😀
First surface mirror
First surface mirror is a mirror that has the reflective coating on the outside of it instead of behind the glass like regular mirrors.
Example: If you were to use a regular piece of mirror to bounce a projector image onto a wall you would get what is called "ghosting" (multiple images, not sharp, color fading etc.)
When you use a first surface mirror it bounces the image exactly as it is projected.
All projectors (every single one as i understand) use first surface mirrors in them to keep focus and contast rations high.
link: http://mirotek.com/images/what is first surface mirror.pdf
ap0the0sis
First surface mirror is a mirror that has the reflective coating on the outside of it instead of behind the glass like regular mirrors.
Example: If you were to use a regular piece of mirror to bounce a projector image onto a wall you would get what is called "ghosting" (multiple images, not sharp, color fading etc.)
When you use a first surface mirror it bounces the image exactly as it is projected.
All projectors (every single one as i understand) use first surface mirrors in them to keep focus and contast rations high.
link: http://mirotek.com/images/what is first surface mirror.pdf
ap0the0sis
i thought you might find this funny.
i thought the 120v ac neg wire would work for the 12v dc ground .yes im still using the same shoot lcd cause luckly i got it fix enough to work. but i also blew out 3 fans and a computer power supply.note this was like 2 mounths ago on the day i got my lcd in from the ups. crazy
i thought the 120v ac neg wire would work for the 12v dc ground .yes im still using the same shoot lcd cause luckly i got it fix enough to work. but i also blew out 3 fans and a computer power supply.note this was like 2 mounths ago on the day i got my lcd in from the ups. crazy
biteon,
im surprised that its still working, usually when you over heat an "IC" (the black chip that is shinny now) to the point it shines it usually burns out. looks like lightning hit your lcd module, ha!
ap0the0sis
im surprised that its still working, usually when you over heat an "IC" (the black chip that is shinny now) to the point it shines it usually burns out. looks like lightning hit your lcd module, ha!
ap0the0sis
the light didnt do that cause at the time i didnt have any light source. i was just seeing if it still work when i took it apart with out the original back light hooked up to it. see in ac power the curent moves back and forth, meaning you can get pwr through the neg. wire . yes im a lucky f*ck, cause that chip still works some what and i got a remote to turn on the lcd etc..
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well, first of all, I threw away that reflector.
And, second of all, I never claimed that it was accurate, or good, or that it would even work at all. I just tried something, because, it seems like nobody ever tries anything, they just sit around and talk here 🙂
I'm going to switch over to a longways-mounted bulb (like Marklar's), and stray away from the halogen-worklight styled reflector. I'm going to try to construct a curve as similar as possible to marklar's. However, I already know that I won't be able to make one as good. I've already scavenged the local lighting supplier stores looking for a reflector like the one that Marklar has, with nothing but funny looks and them telling me "That will be $230, want us to special order it for you today?"
Its frustrating as hell.
And, second of all, I never claimed that it was accurate, or good, or that it would even work at all. I just tried something, because, it seems like nobody ever tries anything, they just sit around and talk here 🙂
I'm going to switch over to a longways-mounted bulb (like Marklar's), and stray away from the halogen-worklight styled reflector. I'm going to try to construct a curve as similar as possible to marklar's. However, I already know that I won't be able to make one as good. I've already scavenged the local lighting supplier stores looking for a reflector like the one that Marklar has, with nothing but funny looks and them telling me "That will be $230, want us to special order it for you today?"
Its frustrating as hell.
did you know that alumunium melts really easy with a torch. maybe do what that one guy said to make a reflector with the foil adhesive,but instead of using adhesive ,i would melt al that aluminuim foil to getter than polish the inside.good idea and sound cheap.
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😎 😎 😎 😎
Undream,
There seem to be replacement elliptical reflector kits out there for stage lights - with prices going from $22 to $30. Check out the reflector thread. Your problems might be solved by $20 and a trip to ebay or one of the other suppliers.
ap0the0sis,
The price on your front surface mirror seems reasonable. They are only really worth it, though, if you are using them in the later stages of the optical path - like an OHP mirror, to bend the image through 90 degrees.
biteon,
You are correct about the reflector thing, which is why most reflectors are used with the bulb mounted longitudinally. This way, most of the light energy is bounced off the sides of the reflector, and not directly radiated out through the front.
Bill.
There seem to be replacement elliptical reflector kits out there for stage lights - with prices going from $22 to $30. Check out the reflector thread. Your problems might be solved by $20 and a trip to ebay or one of the other suppliers.
ap0the0sis,
The price on your front surface mirror seems reasonable. They are only really worth it, though, if you are using them in the later stages of the optical path - like an OHP mirror, to bend the image through 90 degrees.
biteon,
You are correct about the reflector thing, which is why most reflectors are used with the bulb mounted longitudinally. This way, most of the light energy is bounced off the sides of the reflector, and not directly radiated out through the front.
Bill.
biteon,
Good idea about using the torch - couple that with the stuff in the reflector thread about making a mold for it, and you are done - an easy way to make an elliptical reflector around a plaster mold.
Any more DIY than this, and we'll be making our own LCDs...
Bill.
Good idea about using the torch - couple that with the stuff in the reflector thread about making a mold for it, and you are done - an easy way to make an elliptical reflector around a plaster mold.
Any more DIY than this, and we'll be making our own LCDs...
Bill.
hotspot
biteon,
I think you got a hotspot at your projected image.
When light beam hit LCD panel at to much angle ( the best is 90 degrees angle to LCD surface). Light beam around the axis of the lamp will hit LCD at around 90 degrees, further away from the axis it more or less than 90 degrees, and you got dimmed around the end off all sides of the image.
biteon,
I think you got a hotspot at your projected image.
When light beam hit LCD panel at to much angle ( the best is 90 degrees angle to LCD surface). Light beam around the axis of the lamp will hit LCD at around 90 degrees, further away from the axis it more or less than 90 degrees, and you got dimmed around the end off all sides of the image.
i thought the price was resonable too... i was just checking since thi is the first time i get this product quoted.
my intention is to use this mirror with a lcd projector i bought off ebay. (im in the process of building one too) i just figured, for the deal i got, i had to buy it.
i want to ceiling mount this projector. unfortunately it was not designed for this. so my thought was to mount it on the ceiling and use 2 mirrors to bounce the image onto the screen.
pic attached:
my intention is to use this mirror with a lcd projector i bought off ebay. (im in the process of building one too) i just figured, for the deal i got, i had to buy it.
i want to ceiling mount this projector. unfortunately it was not designed for this. so my thought was to mount it on the ceiling and use 2 mirrors to bounce the image onto the screen.
pic attached:
ap0the0sis,
Your design should be ok, and the front surface mirrors should be perfect for the job - but make sure your projector is safe to be mounted upside down: as mentioned earlier, the high pressure MH bulbs are sometimes designed to be mounted one way.
If you mount them the wrong way up, they may explode, or simply die early - costing big buck$. If the bulb is horizontal in your projector, you should be ok.
Alternatively, for the price you will be paying for the mirrors, why not simply mount the projector in a cradle the right way up?
Bill.
Your design should be ok, and the front surface mirrors should be perfect for the job - but make sure your projector is safe to be mounted upside down: as mentioned earlier, the high pressure MH bulbs are sometimes designed to be mounted one way.
If you mount them the wrong way up, they may explode, or simply die early - costing big buck$. If the bulb is horizontal in your projector, you should be ok.
Alternatively, for the price you will be paying for the mirrors, why not simply mount the projector in a cradle the right way up?
Bill.
I would love to mount it the "correct position" however this projector doesn't have a setting to flip the picture, only setting it has is to mirror the pic. (It wasn't designed to be ceiling mounted) so... I have to resort to mirrors to flip the picture the correct way. I figure the mirrors wouldn't be more than 5" square so they wont look so ugly, maybe make some kind of modern looking frame to hold them to the projector.
As for the bulb, It's horizontal so I dont think I'll have a problem with it. I did find a site that has the bulb replacement for this projector for $160 instead of $300 which is what most sites are charging for the whole assembly. (re-freaking-diculous)
I bet alot more people would have projectors if it weren't for the rediculous price of the replacement lamp. I mean, how much can it really cost to make one of these bulbs... $5.00? (if that much)
pic of bulb attached:
anyone know where to get this bulb cheaper?
As for the bulb, It's horizontal so I dont think I'll have a problem with it. I did find a site that has the bulb replacement for this projector for $160 instead of $300 which is what most sites are charging for the whole assembly. (re-freaking-diculous)
I bet alot more people would have projectors if it weren't for the rediculous price of the replacement lamp. I mean, how much can it really cost to make one of these bulbs... $5.00? (if that much)
pic of bulb attached:
anyone know where to get this bulb cheaper?
