High Speed colliamtor for shows

[mixedgas]

Unless the rules have changed, 1993 + 17 years = 2010 = expires in 6 months.

Steve

And I google and the rules have changed: From free Patents on line dot com.
Quote:

This is not necessarily a clear-cut issue, but it is very important to understand for some types of patent searches and licensing issues, so read carefully:

1. U.S. Patents filed after June 8, 1995 expire 20 years from the date of filing.

2. U.S. Patents filed prior to June 8, 1995 expire 17 years from the date of issue, or 20 years from the first non-provisional patent application in the family - whichever is later.

Number 2 is a mouthful there. When we say "the first non-provisional patent application in the family" what we really mean (most of the time) is just "the application." But, we have to put it that way to be accurate, because Continuations-in-Part muck things up (you'll hear about them later).

End quote

[shrad]

@weartronics: I was speaking of that kind of voice coil galvanometers, saw them somewhere at sam's laser faq if I remember well

[drlava]

How about you combine this idea with scan speed /position detection and automatically turn it on if the scan speed falls below a certain rate while in the 'crowd' area which could be defined as a lower bound. In fact you could just automatically turn it on when the x-axis goes below a certain setpoint, if you want to get very simplistic about it.

[heroic]

Sorry to give you guys the bad news, but before going much further with this idea, you might take a look at US Patent 5,274,492.

It's been a while since I have looked at that one, but if I am not mistaken, what you want to do has been patented.

Best regards,

William Benner

That doesn't mean a private individual (or even a corporate) can't build one for experimental purposes, merely that it would be illegal to sell the embodiment of the patent.

[mixedgas]

And not only that, if you improve upon it, you can then patent the improvement and say "999,999,999 is hereby incorporated by reference" which although I'm not sure, seems like a way around licensing 999,999,999.

Steve

[hologeek]

If your looking for piezos I bought some from 'Steminc' on ebay. They worked well for a hombrew scanning fabry perot confocal interferometer. Great seller fast shipping. Just make sure to use low melting point solder as the piezos are damaged from high heat.

Link http://tinyurl.com/lxq3ph

[andyf97]

Wow, I was away for a few days and came back to see the post started, I see the patent thanks fo pointing that out.

from what I looked at so far the challenge is to convert the analog Z into some form of frequency modulation to drive a small amp that drives the peizo.

I have a question for Bill or anyone else who has made laser projection systems.

How is the Z axiz working, exactly the same as X & Y as in electrical specs?. If you draw a 3d cube in LD2000 is the Z ever actually being used.

My brain is wizzing around now with other ideas that can be added to this to make some amazing effects but most are limited by what is happening with Z and blanking.

[shrad]

I think the Z axis is projected in X-Y coordinates before projection, like with basic 3D programming where every scene is projected in 2D before it is displayed

I've been thinking about adapting some old 3D demos to devices like easylase or so, as it would be easy to modify the rendering functions to output data with a DLL

for example the demo "zine 13 headlines ..." (http://demoscene.tv/page.php?id=621&...p&id_group=689) would render extremely nicely with an argon laser, plus the music/bass is absolutely awesome!

they also have some streaming channels on winamp shoutcast TV which would be nice projected on a wall in a concept bar

[mixedgas]

Usually Z signal is directly proportional to the points location in the 3D space defined by ILDA, but in a few cases software is set up so X+Z = X prime for a second perspective for various 3D projection techniques such as flipping polarization every other scan, two scan heads, or anaglyph(red/blue) stereo. It depends how the software is set up to deal with it

Stereo in laser is mind blowing because of the ultra high contrast ratio of laser light. Seen it, back in the day, and ironically now as it has fallen out of favor, BUT NOW the hardware to do it is a factor of 5 cheaper. Within a hobby budget, ie two different green lasers,two scan heads, and each lasers tilted at 45 degrees, and a 65 cent pair of disposable stereo goggles, or a 9$ pair of LCD gaming goggles.
There are at least 4 methods of doing it I can think of,including some single scan head ones.

Steve

[andyf97]

So in a nutshell its got to be done,

I have some improvement ideas too.