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Old 22nd April 2013, 05:08 AM   #131
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Default Hello kach22i

In case you will not be able to read the entire thread; in the early eighties I designed and built a tangentially tracking servo controlled tone arm which functioned correctly. Being servo controlled, it was accurate to 0.1.
It was always my dream to design a tone arm that functioned without a servo, and so in 2010 I designed a new version of my tone arm which was driven by the frictional drag force of the rotating LP. It worked, but was not accurate.
In 2012 I decided to add an electronic servo to my tone arm and I built two prototypes. In the process I made what I believe to be a revolutionary invention which allows 100% accurate tangential tracking. The fact that it is an invention, prevents me from doing what you are suggesting: make a video and put it on U-Tube. Applying for a patent is out of the question at the moment and so I will have to keep it to myself for the time being.
I don’t have a design for the electronic servo as of yet and I play LPs by nudging the tone arm’s carriage along with my finger. That allows me to sit down and listen for about 30 seconds before I have to get up and correct the carriage position. However, the tone arm never goes out of tangency!

The following is a quote from Mr. Conrad Hoffman whom I met on DIY Audio:
IMO, the big gain is actually not the elimination of tracking error, though that's what everybody thinks. The real gain is eliminating cartridge offset/angle and thus the battle of dynamic forces that occurs on the cantilever”
Sincerely,
Ralf

Last edited by Straight Tracker; 22nd April 2013 at 05:11 AM.
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Old 29th April 2013, 01:08 AM   #132
kach22i is offline kach22i  United States
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Quote:
Originally Posted by Straight Tracker View Post
The fact that it is an invention, prevents me from doing what you are suggesting: make a video and put it on U-Tube. Applying for a patent is out of the question at the moment and so I will have to keep it to myself for the time being.
I understand - at least a little bit.

I'm under the impression that a US Patent costs at least $30,000 in lawyer fees, and an International Patent runs about $300,000. In the end, all it gives you is the right to sue people, a drawn out and expensive venture which causes many small companies to go under.

On top of it all, the places most likely to copy (China) will not respect Patents.
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Old 29th April 2013, 05:45 AM   #133
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Default Hello kach22i

I should elaborate on the patent situation.
Under US patent law you have a grace period of one year from the date of making your invention "public" before you have to apply for patent. Under european patent law, you loose your right to apply for patent immediately upon making the invention "public". Putting the invention on U-Tube or into DIYAUDIO, is considered making the invention "public".
I patented my first tonearm by prosecuting the patent application myself.
I could do that again but would have to restudy the patent laws because they have changed considerably since the eighties.
There is an advantage to making an invention "public" and that is, that it prevents everyone else from patenting the invention in their name.
You are absolutely right when you say that owning a patent only gives you the right to sue.
Your reply helped me in making up my mind as to what to do next.
It will take until the end of 2013 to finish the servo design and then the tone arm will be ready to produce. At that point I will custom make it myself or license it to an established manufacturer. So, if the tone arm is available for sale at the same time it is made "public", I may not matter whether it is patented or not.
Of course there is the possibility that the day I announce the tone arm to be available for sale, will be declared "National HO-HUM Day" in the US.

Sincerely,

Ralf

Last edited by Straight Tracker; 29th April 2013 at 05:55 AM. Reason: Grammar
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Old 20th January 2015, 10:28 PM   #134
gninnam is offline gninnam  United Kingdom
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Whatever happened to this ??
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Old 21st January 2015, 05:53 PM   #135
ColinA is offline ColinA  United Kingdom
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Just looking at the picture and drawing one thought comes to mind.
Over engineered!
Look at all those pivot points which WILL either bind or rattle (to some degree)
I can not believe that the improvement in tracking angle would compensate for the deteriation caused by miss-behaving bearings.
I.M.H.O.
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Old 21st January 2015, 09:26 PM   #136
RCruz is online now RCruz  Switzerland
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Quote"The real gain is eliminating cartridge offset/angle and thus the battle of dynamic forces that occurs on the cantilever”

Always felt the importance of this, principally after listening to the B&O parallel tracking tonearms.
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Old 22nd January 2015, 10:25 AM   #137
Hiten is offline Hiten  India
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That is amazingly beautiful tonearm.

(Noob Alert) Some modern desktop scanners have resolution of 4800 dpi. Which may mean motor inside travels at that precision. Teethed belt and stepper motors are used. I wonder if it can be used for linear tone arm ?
Regards.
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Old 15th March 2015, 09:11 AM   #138
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Default gninnam

Quote:
Originally Posted by gninnam View Post
Whatever happened to this ??
I still don't have an electronic servo design for it. It is simply beyond my capabilities.

In 2014 I designed and built an updated version of my tonearm which I finished last week and tested today 3-15-2015. Because of a significant change in the new design, it occurred to me early in the design phase that this new model may just function without the servo. That thought turned out to be correct today, when I played several LPs without a servo at absolutely ZERO tracking error.
I am thinking of posting a partial picture of my new design in the next few days for a general idea of what it looks like.

Sincerely,

Ralf
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Old 15th March 2015, 09:15 AM   #139
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Default Hello Hiten

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Originally Posted by Hiten View Post
That is amazingly beautiful tonearm.
Thank you very much.

Sincerely,

Ralf
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Old 15th March 2015, 09:22 AM   #140
gninnam is offline gninnam  United Kingdom
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Quote:
Originally Posted by Straight Tracker View Post
I still don't have an electronic servo design for it. It is simply beyond my capabilities.

In 2014 I designed and built an updated version of my tonearm which I finished last week and tested today 3-15-2015. Because of a significant change in the new design, it occurred to me early in the design phase that this new model may just function without the servo. That thought turned out to be correct today, when I played several LPs without a servo at absolutely ZERO tracking error.
I am thinking of posting a partial picture of my new design in the next few days for a general idea of what it looks like.

Sincerely,

Ralf
Cheers Ralf and sorry that you came to a halt with the original design but if your new design works then kudos to you (looking forward to the pictures)
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