Can anyone tell me what field coil(?) driver/patent this is?

mondogenerator · 10:00 PM

Basically a very long story, ill try and explain as concisely as possible.

Looking through the library many years ago I remember stumbling across a very interesting patent for a loudspeaker driver. Essentially a field coil driver IIRC, the voicecoil was twin/triple, one coil was fed DC, and the driver MAY have been spiderless, and very 'free' surround suspension. Essentially allowing Vas to be varied, by varying the restorative force of the DC coil. I think the 'magnet' was also fieldcoil, although it couldve been PM. There may even have been some kind of DC bias with twin coils, with the respective +ve and -ve half cycles superimposed on the DC, like an electrostatic bias. Except this is a unconventional type of electrodynamic driver.

Can anyone help me with the patent? Does anyone know of what i am speaking? Id love to get a copy of the patent drawings again, IF freely available and legally lol. Might be worth messing with a dual VC driver and seeing if anything reasonable results...maybe removing the spider...

Any help would be great!

GM · 13th August 2011, 11:39 PM

Doesn't 'ring a bell', do a patent search for Harry F. Olson [RCA] as he applied for numerous driver patents, some quite unique/strange.

GM

Top Shelf · 14th August 2011, 02:10 AM

Can you do a quick sketch, that sounds familiar.

mondogenerator · 07:54 AM

@ GM thanks, Olsen may be the inventor, to be honest i can only vaguely remember this and just an image of the driver schematic. Olsen wull be at least a good place to start!

@Topshelf, as above I can only remember the vague image, just the idea of a variable Vas or corrective force due to a DC 'suspension' is very intriguing.

454Casull · 15th August 2011, 03:15 AM

Not sure if this is applicable, but food for thought anyway:

MORE* WHITE* PAPERS

13th August 2011, 09:57 PM	#1
mondogenerator diyAudio Member Join Date: Sep 2009 Location: England	Can anyone tell me what field coil(?) driver/patent this is? Basically a very long story, ill try and explain as concisely as possible. Looking through the library many years ago I remember stumbling across a very interesting patent for a loudspeaker driver. Essentially a field coil driver IIRC, the voicecoil was twin/triple, one coil was fed DC, and the driver MAY have been spiderless, and very 'free' surround suspension. Essentially allowing Vas to be varied, by varying the restorative force of the DC coil. I think the 'magnet' was also fieldcoil, although it couldve been PM. There may even have been some kind of DC bias with twin coils, with the respective +ve and -ve half cycles superimposed on the DC, like an electrostatic bias. Except this is a unconventional type of electrodynamic driver. Can anyone help me with the patent? Does anyone know of what i am speaking? Id love to get a copy of the patent drawings again, IF freely available and legally lol. Might be worth messing with a dual VC driver and seeing if anything reasonable results...maybe removing the spider... Any help would be great! __________________ Im the guy that speaks in haste, and makes ill conceived theories, thinks math is a necessary evil, but i know something.Sometimes it bugs me, then i then i realise that theres 10 more just the same.So i guess Mulder was right. We are not alone. Last edited by mondogenerator; 13th August 2011 at 10:00 PM. Reason: MOD: maybe this should be in exotics? im not sure where to post.

13th August 2011, 11:39 PM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Doesn't 'ring a bell', do a patent search for Harry F. Olson [RCA] as he applied for numerous driver patents, some quite unique/strange. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

14th August 2011, 02:10 AM	#3
Top Shelf diyAudio Member Join Date: Apr 2010 Location: Midland, Ontario	Can you do a quick sketch, that sounds familiar. __________________ JEREMY M_________________________________ I like it loud, BUT NOT TOO LOUD!.... Hey do you hear that high pitched ringing sound ?

14th August 2011, 07:52 AM	#4
mondogenerator diyAudio Member Join Date: Sep 2009 Location: England	@ GM thanks, Olsen may be the inventor, to be honest i can only vaguely remember this and just an image of the driver schematic. Olsen wull be at least a good place to start! @Topshelf, as above I can only remember the vague image, just the idea of a variable Vas or corrective force due to a DC 'suspension' is very intriguing. __________________ Im the guy that speaks in haste, and makes ill conceived theories, thinks math is a necessary evil, but i know something.Sometimes it bugs me, then i then i realise that theres 10 more just the same.So i guess Mulder was right. We are not alone. Last edited by mondogenerator; 14th August 2011 at 07:54 AM.

15th August 2011, 03:15 AM	#5
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Not sure if this is applicable, but food for thought anyway: MORE* WHITE* PAPERS __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet


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