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Author Topic: Image projector info needed  (Read 1072 times)
Kevin C Cooper Esq
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« on: January 11, 2012, 09:20:22 pm »

I want to add image projection to a project, my knowledge is limited to "image, lamp,lens" not necessarily in that order! Google keeps returning drivel featuring iPhones, shoe boxes and cheap magnifying lenses.
Nothing to fancy required (I hope)
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neon_suntan
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« Reply #1 on: January 11, 2012, 09:29:11 pm »


Look for second hand OHP (overhead projectors) they tend to be quite cheap whereas the replacement bulbs can be very expensive....

Where are you based... I may have one you can borrow.
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Mr Peter Harrow, Esq
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« Reply #2 on: January 11, 2012, 09:57:48 pm »

What you may need is a data projector, it can take feed from a DVD player, or a laptop, so you can show everything from video to powerpoint. Look for a suitable projector on ebay, they aren't cheap though, and the bulbs are the most expensive element. Maplin did sell them, so you can have a look see before buying. They are effectively the modern 'Magic Lantern'.

You can hire, or borrow one instead (several con running fans of my aquaintance have a couple a piece, as an essential piece of kit).
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« Reply #3 on: January 11, 2012, 10:32:39 pm »


You can make a very simple projector with a box a lamp, a lens and a mirror

This http://www.artograph.com/products/projector_tracer.htm works on exactly this principal.

In essence it works like this :

The image lies horizontally on the bottom of the box.

The mirror sits above it angles at 45 degrees to both the plane of the image and the axis of the lens.

The lens sits in the side of the box, able to slide in and out, It is all aligned so that a line down the center of the lens hits the center of the mirror and intersects at a point directly above the center of the image.

The image is illuminated by a bulb and is focused/enlarged by the lens, focus is adjusted by moving the lens in and out (ie towards or away from the mirror).

This system is pretty simple but it works and in a dark room will produce reasonable contrast even with an ordinary domestic bulb. 

The main drawback is that with a single lens you're stuck with a fixed focal length so the only way to changing the size of the projected image is by moving the projector closer to or further away from the screen.
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« Reply #4 on: January 11, 2012, 11:36:59 pm »

Lumenlabs
http://lumenlab.com/forums/index.php?showforum=29

They sell kit parts as well I believe, basically a stripped down monitor, a bright lamp, and three lenses in a box.

and a debate about the pros and cons here:
http://www.hometheaterforum.com/t/189692/lumenlabs-homemade-projector-scam-or-worth-it

Stripping LCD monitors is not for the faint-hearted mind, it's a 50/50 chance that you will sacrifice at least one to the angry gods of silicon before you're done.
« Last Edit: January 11, 2012, 11:39:38 pm by Smaggers » Logged

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Kevin C Cooper Esq
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« Reply #5 on: January 12, 2012, 02:58:22 pm »

Thanks everyone, I shall look at all the information you provide, though I have to say I'm primarily looking for simplicity and minimum expenditure.
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bicyclebuilder
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« Reply #6 on: January 12, 2012, 03:16:15 pm »

You could also go to the local toy store and look for toy projectors.
I remember a nephew having a toy projector with Disney slides that project onto a paper, so you can trace the drawing.
There are also music boxes that project happy images on the walls.
Just look in the toy store for toys that use projector technology.
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« Reply #7 on: January 12, 2012, 03:24:43 pm »

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Capt. Dirigible
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« Reply #8 on: January 12, 2012, 04:12:41 pm »

Quote
You could also go to the local toy store and look for toy projectors.



Maybe something like this could be utilised? £14.99 + £4.95 inc P&P

http://compare.ebay.co.uk/like/310272621243?clk_rvr_id=306333066638

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« Reply #9 on: January 12, 2012, 11:55:34 pm »

I built a projection screen once..... wood tapered frame cardboard coverd
white sheet for projection surface of 6'x 8' the one side was cut open to the rear
a large mirror was placed at an angle and a video projector shot the image via
the mirror on the sheet from the rear... it worked very well was made cheep
as it was a one time use in conjuction with a drama... was not the main focus
just added information to a discription in the drama.
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Kevin C Cooper Esq
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« Reply #10 on: January 13, 2012, 09:47:04 pm »

Excellent suggestions Gentlemen, Much food for thought.
Captain Diriglble I do believe I owned a Chad Valley projector very similar to that one as a child, it was so long ago I'd forgotten.
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Miss Groves
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« Reply #11 on: January 13, 2012, 10:54:48 pm »

frensel lenses are pretty cheap to get hold of, i alos would be able to lend n ohp if you needed
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