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Need ideas on how to repair Sega hologram parabolic mirror

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Avery:


--- Quote from: Stingray on December 21, 2005, 03:59:55 pm ---Both work great on styrene (which is what most scale model kits are made of) but won't touch acrylic, which seems to be what most here are assuming this dish is made of.

--- End quote ---

Good to know.  Maybe just getting the geometry close and smearing JB weld all over the back of the crack is the right answer then. 

Meanwhile, back at the ranch - is this disk just reflecting a flat screen image that has been distorted to allow for the curvature?  Is it really parabolic or just a spherical section?  Is there a fresnel lense in this setup anywhere?

TravistyOJ:


--- Quote ---Meanwhile, back at the ranch - is this disk just reflecting a flat screen image that has been distorted to allow for the curvature?
--- End quote ---

Yes, basically if you run "mame holo -flipy" that is the output of the JAMMA board.


--- Quote ---Is it really parabolic or just a spherical section? 
--- End quote ---
I think both, are these terms mutually exlcusive?  Please excuse me on this, since I dont use these words very often. :)


--- Quote ---Is there a fresnel lense in this setup anywhere?
--- End quote ---
I dont know what that is, but my guess is no.  Its just a TV and the plastic mirror.


RandyT:


--- Quote from: TravistyOJ on December 21, 2005, 05:05:15 pm ---

--- Quote ---Is it really parabolic or just a spherical section? 
--- End quote ---
I think both, are these terms mutually exlcusive?  Please excuse me on this, since I dont use these words very often. :)


--- End quote ---

A parabola has a constantly changing curve, whereas a sphere has a constant one.    Based on how this was probably manufactured (blow molding), I'm going to guess that it is a sphere.  Parabolas are more difficult to make, thus much more expensive.

Not to mention that fact that a parabolic segment won't work in that configuration.

RandyT


MYX:


--- Quote from: TravistyOJ on December 21, 2005, 05:05:15 pm ---
--- Quote ---Is there a fresnel lense in this setup anywhere?
--- End quote ---
I dont know what that is, but my guess is no.  Its just a TV and the plastic mirror.


--- End quote ---

Hey Travis, The lensing on the top of that thing is fresnel. It is how they give the illusion of bending the image to stand up on the table.

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