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- (c)Copyright 1992 by Noah Spurrier
-
- ---------------------------
- Description of The Warper
- ---------------------------
- The Warper is a simple device for enhancing the pleasure that you get from
- running your Acid Warp program. The Warper is a single lens projector that
- attaches to your computer monitor and allows you to enlarge and project the
- Acid Warp images onto a wall, movie screen, white bed-sheet, etc. The
- device should cost you less than $20.00.
-
- I will give only a general schematic for building The Warper. The design is
- quite simple and it will be easy for you to fit the design to your supplies
- and equipment size. The only special item that you will need is one large
- Fresnel lens. A Fresnel lens is usually encountered as a thin, floppy sheet
- of plastic that has the same optical properties as a glass lens many inches
- thicker. You may use a true glass lens. For our purposes we need a lens about
- 6 inches or more in diameter. A glass lens this size would be very heavy and
- expensive, but if you have one on hand then try to use it because it should
- give a better image. The following instructions assume that you will be using
- a Fresnel lens.
-
- You will need a lens about 6" x 6". You can make The Warper with a smaller
- lens, but it will be less effective. You can certainly use a larger lens.
- I will give sources of cheap Fresnel lenses at the end of this text. Don't
- worry about focal length. For surplus and hobby grade equipment, you must
- take what you can get. A focal length of about 5 inches is fine. Often you
- won't even be told what the focal length is. Only the focus will have to be
- adjusted to compensate for the focal length of your lens.
-
- When you get your Fresnel lens, take it and your computer into a dark room.
- Activate the computer and execute the Acid Warp program. Now Aim the
- computer monitor at a white wall, movie screen, white sheet, etc. The
- plane of the monitor screen should be roughly parallel to the plane of the
- projection surface. Now hold your lens in front of the computer monitor.
- The lens should also be roughly parallel to the projection surface and the
- computer monitor. As you vary the distance between the lens and the monitor
- you will be able to focus an upside-down image from the monitor onto the
- projection surface. The exact distance between the screen and the lens will
- vary on how far your monitor is from the projection surface and the focal
- length of your lens. For my setup, a wall is about 12 feet away and the
- lens is held about a foot from the screen. The image covers most of the
- wall. You may never be able to get the focus good enough to read 80 column
- text, but you should be able to easily read the Acid Warp title screen.
-
- Besides the wobbly image and arm strain this method is flawed for one
- technical reason. A very large amount of light leaks off to the sides of
- the lens and fills the room with stray light. This badly washes out the
- image. All that is necessary to fix this is to enclose the monitor is a
- black box with the lens as the only opening for light to escape.
-
- -------------------------
- How to Build The Warper
- -------------------------
- Here is the simple method that you can scale to your supplies and skill. You
- only need two cardboard boxes to make the black, light-tight box. Use wood,
- metal, or plastic if you want a fancy box. You will have to work out the
- details for those materials by yourself. For my first prototype I used wine
- boxes that I got from a bar where I work. Wine boxes are very sturdy. For
- your boxes one should fit inside the other. You may need to rip the side
- panel seam on one box and reglue it so that it is slightly smaller or larger.
- Fit is not critical, as long as the boxes are snug, yet slide easily. This
- telescope action will allow you to focus.
-
- Spray paint the insides with FLAT BLACK paint. If you don't paint the inside
- then the results will not be as good.
-
- Cut a hole for the lens in one end of the larger box and attach the lens
- over this opening. Remove the flaps from the other end of the box or fold.
- them in. If you fold them in then the bigger box will fit more snuggly around
- the smaller box.
-
- One end of the smaller box should have its flaps pulled open, but not cut
- off. These flaps fit over and around the monitor. Remove the flaps from the
- other end of the box.
-
- When complete, the flaps of the smaller box should be taped to the sides and
- top of the monitor. It does not matter if the fit is rough. The important
- thing is to make sure that very litle light escapes and that The Warper is
- held straight and steady on the front of the monitor.
-
- The larger box will fit over the smaller box and slide toward or away from
- the monitor screen. This will allow you to adjust the focus. You may need
- to put some blocks under the front (lens end) of The Warper to prevent it
- from sagging. I had no trouble with wine boxes.
-
- If you cannot move the lens close enough to the screen to get proper focus
- then simply trim a few inches off the edges of the open ends of the boxes
- where the smaller box meets to slide into the larger box.
-
- / FLAP
- /'
- |-------------------- /'.----------- BACK OF
- | -------------------| \ TOP |`\ MONITOR
- :| | # | `\--, <------
- : HOLE | # | | |
- : | # | | |
- : | # SIDE | | | CABLE
- : | # | | |-------()
- LENS :| | # | /--'
- | -------------------| / BOTTOM | /\ AC PLUG
- |-------------------- `\ `-----------' \_________,--
- < ------- > `\ `--
- MOVE `\ FLAP
- FOR
- FOCUS
- CROSS-SECTION DIAGRAM
-
- Your Warper is now ready for use!
-
- For best results: use a white projection surface; make the room very dark;
- turn up the brightness of your monitor. You may also need to adjust color.
-
- -------------------------------
- Sources for Your Fresnel Lens
- -------------------------------
- American Science and Surplus Co.
- (Formerly Jerry Co.)
- 601 Linden Place
- Evanston, IL 60202
- Orders 708-475-8440
-
- AS&S sells a hodge podge of surplus items. Some of it is good,
- some of it is junk. When you get their catalog, look for the "Optics"
- section. They should still have a large supply of 11" x 11" fresnel lenses
- for $1.95. They also sell an 11" x 11" Twin Layer lens for $3.25. These
- lenses have minor scratches. A friend informed me that for our purposes
- they work well. If they are sold out of these particular lenses then they
- will probably have others that will work. Minimum Order is $10.00.
-
-
-
- Edmund Scientific Co.
- 101 East Gloucester Pike
- Barrington, NJ 08007-1380
- Orders 609-573-6250
- 609-547-3488
- FAX 609-573-6295
-
- Edmund Scientific Co. sells quality optics as well as hobby materials. When
- you get their catalog, do not want to start looking in the Optics section
- (unless you want to pay $30.00 for a 6" x 7" lens.) Look in the index under
- "Fresnel" or "Lenses". There should be some lenses referenced in the hobby
- section of their catalog. There, find a listing for an 8.5" x 11" lens for
- about $7.95. They also sell a 7" x 10" lens for about $5.95. This is the
- size I originally used.
-
-
-
- Herbach and Rademan Co.
- 18 Canal Street
- P.O. 122
- Bristol PA, 19007-0122
- Orders 800-848-8001
- FAX 215-788-9577
- Office 215-788-5583
-
- H&R Co. sells new and surplus equipment for science and industry. They have
- a small selection of inexpensive multilens units and rear projection screens
- for TV projection systems. Most of the projection lenses are designed for a
- specific size of TV tube and may not necessarily be ideal for a different
- sized monitor, but the prices are low and these lenses are worthy of
- experimentation. H&R also sells single multipurpose glass and fresnel lenses
- in large sizes.
-
-
-
- Macrocoma Co.
- Dept. m
- 15 North Main St.
- Washington Crossing, PA 18977
- Orders 215-736-2880
-
- Macrocoma is a weird company. They sell TV-Projector conversion kits. They
- also sell a booklet on how to make Fresnel lenses. I don't recommend it.
- They sell a Fresnel lens for about $15.00. I think the quality is supposed
- to be quite good. Ask for "The Master Lens" (Special made, Triple
- inspected, the best of the best.)
-
- The Warper (c)Copyright 1992 by Noah Spurrier
-