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Old 25-04-2003, 20:52   #1
Woz
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Projector through a 'periscope'

OK - I've just had one of those 'on the bog' brainwaves, so please bear with me....

The main problem I see with projectors are the fan noise and the fact that the ceiling mount can be intrusive in a living room.
Does anyone know if anything like this has been done :



The projector sits on the floor of the room above (probably under the bed ).
You'd need to route cables obviously, and would also need a remote sender, but this setup would get rid of any fan noise, and the intrusion into the living room could be VERY discrete if required.

Sadly, I've not got the money for a projector, let alone the cost of making an optical device like the 'periscope' but what d'ya think of the idea?
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Old 26-04-2003, 09:50   #2
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Good idea but does the fact that you would now be projecting theimage 3 times instead of 1 not effect the quality?
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Old 26-04-2003, 09:58   #3
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the theory is good, but in practicallity in its current configuration it wont work, you would have to put the periscope at the LCD panel and the lens at the end of the periscope. which would then give you a differing focal length between the lens & LCD meaning a lens redesign. or extreme loss of quality
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Old 26-04-2003, 11:15   #4
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As threadkiller says it is possible but it is a soultion that would need to be left to the pofessionals (e.g. the designers) and I think it would be almost impossible to produce as a DIY project, and not reduce quality to a point where it is unwatchable.

However the theroy is sound you would get light comming from the end. Its just what it would look like that is the problem.
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Old 26-04-2003, 16:43   #5
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Drat!
Back to the drawing board then
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Old 26-04-2003, 18:23   #6
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Good idea though mate. Keep it up.

Cheers, Brock.
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Old 28-04-2003, 10:35   #7
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Sorry mate, even if you got the lenses hand tooled to order, you'd still find the rig unwatchable.

As we all know, any AV equipment placed under a bed becomes a magnet for man carpet.

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Old 28-04-2003, 12:33   #8
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Interesting idea.

my optics isn't that great but I don't think Threadkiller's point about moving the lens to the end of the periscope is exactly right. As I see it, you're problem is etendu. That is, as the light spreads out from the lens, much of it hits the sides of the periscope and as a result, makes the edges dim and the image blurry.

Putting the lens at the other end of the periscope would help but wouldn't fix the problem, even if you re-designed the lens. You need to parrallelize the light leaving the projector then restore the original f/number at the periscope exit. This isn't that difficult to do with some basic optics know-how, if you knew the f/ number of the projector. You'd need good lenses though.

Alternatively, you could just use a very big periscope.

I'm sure that didn't help,
Phill
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Old 29-04-2003, 16:25   #9
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Quote:
Originally posted by Phill


Alternatively, you could just use a very big periscope.

But it was funny...
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Old 30-04-2003, 12:08   #10
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You could project out of an upstairs window onto a nearby building (a la Cinema Paradiso) - simply arrange your speakers around your living room windows for that true cinematic effect

(Sorry)
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Old 25-08-2016, 15:04   #11
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They did it as this cinema, there's a photo of it about 1/3rd of the way down the page:

http://www.cwmbranlife.co.uk/cwmbran...ears-of-films/
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Old 25-08-2016, 17:19   #12
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I know it's an old thread, but wouldn't an easier solution be to box it in behind glass like they do at the picture house?
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Old 26-08-2016, 11:23   #13
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Just noticed this thread, one of the cinema's I used to be a projectionist at (Leicester ABC Abbey Street) had periscope mirrors, if the public noticed them they could have moved them quite easily and the film would have been projected on ceiling or floor, thankfully it didn't happen much. As long as they were kept clean, they did the job but it was considered a lesser form of projection. The Odeon Burton did rear projection which was very hard to run as you couldn't see the masking (black cloth framing) until went into the auditorium. Just trivia but it was an ace job.

I hate the noise of our LCD projector and it's in another room but if you have a booming film on, it's well hidden.
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Old 26-08-2016, 13:47   #14
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Quote:
Originally Posted by stephen View Post
They did it as this cinema, there's a photo of it about 1/3rd of the way down the page:

http://www.cwmbranlife.co.uk/cwmbran...ears-of-films/
That's a blast from the past, my dad used to take me there as his office was nearby. Easily the smallest cinema I've ever been to it was more like a home cinema.
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Old 28-08-2016, 18:49   #15
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Old thread and projectors have come on a bit.... this ultra short throw projector looks a bit like a periscope.

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