Pistonic corrugation

[brunob]

Beyer ribbon Microme have a special corrugated ribbon:


The picture is from this thread: Beyer M160 ribbon mic


The central part is rigidified whereas the sides act like a suspension. Has anyone tried such corrugation for a speaker?


Bruno

[a.wayne]

Corrugation hurts the midrange IMO, so i have created the suspension at the ends for tensioning and low freq response and left the middle smooth , best compromise so far .

Corrugating the tweeter does work .....

[geraldfryjr]

I did make a multi striped ribbon shaped like that, But I never got to test it,many many years ago.
As of last year I still had it,But now I can't find it as I was going to post a picture of it to show my etching technique on another thread.

I used copper foil etched and then sandwiched in between two layers of .25mil mylar with a very very thin layer of rubber cement.
I was exteremly light and the long folds gave it alot of rigidity.
And it did not readily bend easily.
I was messing around with ribbon designs from 1992 to 1998.

jer

[LineArray]

Hi,

i have shown this one before, but it does not move
pistonic, it bends preferably around the vertical
axis ...

[brunob]

Originally Posted by a.wayne

Corrugation hurts the midrange IMO, so i have created the suspension at the ends for tensioning and low freq response and left the middle smooth , best compromise so far .

Corrugating the tweeter does work .....

I came accross this patent:
Ribbon Loudspeaker Having Corregated Ribbon For Reducing Distortion

In this patent, the corrugations at the two ends are 5 times larger than in the middle.The goal is to reduce the "snaking" of the ribbon - I am not sure what that means.

[brunob]

Originally Posted by LineArray

Hi,

i have shown this one before, but it does not move
pistonic, it bends preferably around the vertical
axis ...

Found: To ESL or to Ribbon?

[brunob]

Originally Posted by a.wayne

Corrugation hurts the midrange IMO, so i have created the suspension at the ends for tensioning and low freq response and left the middle smooth , best compromise so far .

Corrugating the tweeter does work .....

The speaker shown in the pictures looks interesting. Is there more information/details available somewhere?


Thanks,

Bruno

[a.wayne]

Originally Posted by brunob

I came accross this patent:
Ribbon Loudspeaker Having Corregated Ribbon For Reducing Distortion

In this patent, the corrugations at the two ends are 5 times larger than in the middle.The goal is to reduce the "snaking" of the ribbon - I am not sure what that means.

The ribbon tends to bend like a snake after full corrugation making it difficult to tension and kept straight. If you want ( and you want ) tight magnetic gaps he is using the bigger folds to get the ribbon tensioned straight without "S" bends (snaking).....


regards,