Goodbye ! No more speakers with cones !

[Remlab]

John
How do you keep it from canceling frequencies longer than its width? Even If it does turn out to be a viable design (Independently tested by a reputable source), I couldn't imagine it being used for anything other than a high frequency transducer. And if that's the case, you've got some STIFF competition, my friend..
Seth

[planot]

Originally Posted by Remlab

John
How do you keep it from canceling frequencies longer than its width? Even If it does turn out to be a viable design (Independently tested by a reputable source), I couldn't imagine it being used for anything other than a high frequency transducer. And if that's the case, you've got some STIFF competition, my friend..
Seth

I don't have to do anything as it is accomplished by the geometry of the diaphragm.

John

[oshifis]

Then here is my other question: what is the benefit of this thread for us DIYers?

[planot]

Originally Posted by oshifis

Then here is my other question: what is the benefit of this thread for us DIYers?

I did not start this thread.

I joined the thread to answer what questions I could,

and I will be selling plans for DIY Audiophiles.

I guess you have to judge for yourself what the value is.

John

[dudaindc]

Originally Posted by oshifis

Then here is my other question: what is the benefit of this thread for us DIYers?

In my humble opinion there is one - knowledge... it does not take much space and can even be useful when we least expect.

[Remlab]

Here is the patent, as found in google patents..
Patent US7860265 - Diaphragm for full range boxless rotary loudspeaker driver - Google Patents
Now we can all make our own! YEEHAHAYEEHA! Kidding!

"The diaphragm that has at least three sides and when rotated along its central axis creates a positive pressure in the surrounding medium on all sides parallel to the axis of rotation and is not subject to phase cancellation of front and back waves". True, but there ARE cancellations of the "this side, and that side" waves, since there is no true "rear". Correct? It is also stated that there is no box. The transducer "diaphragm" is, in itself, a box. Is it not?

[Remlab]

I just loaded my clothes washer and looked at the central agitator . What it does to water is a rough, but pretty good analogy I think. Replace it with a triangle column and see what it does!
I'm not sure, but I think that the response you will get will exhibit extremely tight comb filtering(unnoticeable?) and as a result, low efficiency due to 120 degree tangential cancellations on all three edges..

[Remlab]

This was just pointed out to me by a 'certain' physicist as a possible propagation theory. It would be emanating sound in all directions at once though..
Vortex shedding - Wikipedia, the free encyclopedia

[SY]

Originally Posted by Remlab

Here is the patent, as found in google patents..
Patent US7860265 - Diaphragm for full range boxless rotary loudspeaker driver - Google Patents
Now we can all make our own! YEEHAHAYEEHA! Kidding!

Yes, you can if you like. I suspect that an attorney's help might have resulted in a better claim (the one granted seem to have a major problem), and I'm astonished that the examiner didn't point out a major flaw in the claim which appears to me to essentially render the patent worthless. Nonetheless, even with presumed validity, under patent law you are free to build and experiment to satisfy your curiosity and to see what performance you can get out of the concept. I would encourage people who know how to use measurement tools to do so and post their results- Julian's were almost exactly what I would have expected.

[planot]

A patent does restrict the building of patented devices even if they are not made for sale but are just for personal use. You can contact me about receiving a license for building devices for personal use.

As for the validity of my patent. First, the US Patent office thinks it is OK.

James Croft, who reviews AUDIO patents for Voice Coil Magazine, had nothing negative to say about my patent when he reviewed it for Voice Coil Magazine, he usually tears patents apart without mercy. My lawyer, who is an IP lawyer said it was a well written patent. I have in the past corresponded with one of the leading patent litigation lawyers in the US and he said it was a well written patent.

This is all I will say about my patent here. If you have more questions about the Planot driver then I would direct you to my Web site for further information.

You can send questions to... info@planotspeaker.com

Go to... http://www.planotspeaker.com/