Re: New XY Monitors

Rodger Boots wrote:

> Call me naive, but I was going to get the light source VERY near the galvos (no more than 1/4") and the galvos VERY close to each other (1/2" maximum). This would allow the
> galvo surfaces to be very VERY small (can you say minimum inertia?)

for the Laser we use 3mm x 3mm (X-axis Mirror) 3mm x 5mm (Y-Axis) and the mirrors are less than 2mm away from each other... and I can get what's known as 50,000pps (about 12k
vectors per second, or 400 vectors per frame at 30fps) if I use 5x5 and 5x8 stock (Usually used for remote fiber Launched Heads) I can do at max 24,000pps minimal inertia
but at these speeds resonance frequencies of the mirror stock, glass warping and/or shattering become a factor

> and wouldn't be conventional mirrors at all. By keeping inertia low and movements very small I was
> hoping to use either piezo transducers or those mini-headphone speakers. Problem there is finding some with high enough reflectivity.

you need something that has a position sensor.. to be able to halt the mirrors and not over shoot it's target
again mini headphone speakers or piezo you could probably do 20-30 vectors per second...

>
> Scanning power would be quite low, simple amplifier with no heatsinks. Possibly (wishful thinking would be more like it) drivable from the game board without any amplifier
> at all.

look at the amplifiers like on a Wells Garner... you could probably use the output of that to the magnets easier than the signal coming from the board....

>
>
> The lamp drivers would be scarier, but I had some interesting ideas for doing that.
>
> At the present time, a low-cost LASER diode could probably handle the red. But the <$20 red LASER sounds good, the green beam would be over $300 and blue just isn't
> available.

some day soon there will be all colors cheap.. every laser company in the world is working on the blue... it's been made, but they are having a hard time making it work
consistantly

>
> And there still is the problem with the screen having no persistence.

monitors have no persistance. LCD's laptop screens have some, ever try to play a video game on a LCD... all you see are ghosts or smearing. Asteroids and such run at 30-60
frames per second, Asteroids, 60 Frame Per Seconds, there is defiently no persistance there, or it would look like hell.

>
>
> Now making a vector monitor in the form of a GOGGLE is a whole different story. Here LEDs would work. Entire goggle could be done for possibly under $100.

Backlit LCD would work here.. a little 5x5mm color LCD... but you still need a driver to convert from vector to a pixel based display

>
>
> Robert Mudryk wrote:
>
> > the galvo's in a old Laser player is known as a GAL-2 seen sold on ebay every once and awhile... best case... you could scan a single letter.. if it was large
> > enough... a GAL-2 is rated at 300 points per second, or about 4-5 vectors per frame... nice for making pretty patterns in laser though :)
> >
> > peter jones wrote:
> >
> > > -----Original Message-----
> > > From: Rodger Boots <rlboots@cedar-rapids.net>
> > > To: vectorlist@synthcom.com
> > > Date: Thu, 16 Nov 2000 14:54:42 -0600
> > > Subject: Re: VECTOR: New XY Monitors
> > >
> > > > I was thinking the "laser bouncing off of galvos" method, but the problems there
> > > > are getting the costs down.
> > > >
> > > > So then I says to myself "self, how about using very small earphone elements or
> > > > piezo transducers VERY close to the laser so they don't have to move much to get a
> > > > LOT of deflection?", but the lasers are still too expensive.
> > > >
> > > > So then, though it's a messy approach, I wondered about using arc lamps for the
> > > > three colors. Doing high speed modulation should be a nightmare, but let's just
> > > > see where this thought goes. How much are those arc headlights they use on some
> > > > cars?
> > > >
> > > > The whole downside to all of this, though, is the lack of persistence that CRT
> > > > phosphors give you. On the "bright" side, though, explosions could light up the
> > > > room!!!
> > > >
> > > I was going to try and play asteroids once using a laser-diode from a pen running past 2 galvo's from an old phillips laser-player but never got around to building it.
> > >
> > > it was only to project a small 10-30 inch image but it was just an idea to test the galvo-speed.
> > >
> > > L8r.
> > >
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>
> --
> Windows:
>
> 32 bit graphical interface for a
> 16 bit patch for an
> 8 bit operating system written for a
> 4 bit processor by a
> 2 bit company that can't stand
> 1 bit of competition.
>
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Received on Sat Nov 18 11:51:30 2000