Z+ Z- pins

[leif26]

Hi, what is the purpose of the Z+ and Z- pins on DB-25 cable? is it for regulating distance from scanner to surface being projected on?

[CountFunkula]

They're generally used in stereoscopic applications

[james]

What about beam-brush?

[mixedgas]

Would
have
been
used
for
Beambrush
if it ever caught on.

Sadly a low cost fast electromagnet focus actuator for beam size has been created, but never made it to market. (Conan has other things to do...)
I had just asked its inventor if he would market me one last month, no dice.... Too bad, I have a potential
commercial market for it, outside of shows...

This was the other way, Beambrush gave four beam sizes..

NEOS used to sell it, requires amazing CNC skills to build the way they did, so it did not require a pile of mirror mounts..
If anyone has one laying around, I wish I had pics of how precise that machining was. That version was figure two in the patent.

Robert V. Belfatto, Gregory O. Makhov,William R. Benner, Jr. US Patent: US5621561

https://www.google.com/patents/US5621561


------

Steve

[DZ]

I posted this a few years ago. X/Y attached to one oscilloscope and X/Z attached to the other oscilloscope.

[swamidog]

I posted this a few years ago. X/Y attached to one oscilloscope and X/Z attached to the other oscilloscope.

i could watch this all day.

[danielbriggs]

Sadly a low cost fast electromagnet focus actuator for beam size has been created, but never made it to market.

I designed this laser fixture fairly recently.
It is NOT a projector, it's an ultra compact 4W RGB laser beam effect with built in actuator for switching in and out rotating diffraction gratings + some fancy lens voodoo to give you the ability to "zoom" the beam // change the divergence on the fly // OR // set upper and lower limits the LD can work within w.r.t. easily achieving MPE limits for diffracted effects. It's not electromechanical, is relatively cheap, and so, so compact.

The plan is you use them in 10-20qty's.
I've stated in the video (ultra fast focus) I think it's pretty quick, but it might not be Steve's definition of ultra fast

This doesn't strictly relate to the Z-/Z+ dicussion; just adding in my tangent.

All the best,
Dan

[mixedgas]

I like this thread... Keep the posts coming guys.. We're dangerously close to having a technical discussion here....
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We forgot to add polarization flipping stereo projection (LCD or EO modulator used as waveplate) and two scan stereo head projection.
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There is external some sum and difference math from the Z pin to the x axis pin that let you do two scan head three D. I forget how to do the setup with the external op-amps...

Steve

[CountFunkula]

Steve-

If you can remember the sum+difference math, i'd be very interested. I'm very close to having a decent stereo/anaglyph setup running. Parallax is a little wonky for now.

[laserist]

For stereo you'd just sum the z axis signal as an offset to the x axis of each scan pair inverting the signal to one of the scan pairs.