small angle/rotary encoder ?

I'm looking for a small angle (or rotary) encoder, I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees

- diameter < 20 mm

- thickness < 10 mm

- accuracy +/- 2 degrees

- small quantities (10 .. 100)

Any ideas ?

Stef Mientki

Reply to
Stef Mientki
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The smallest absolute encoder I can find is 32mm X 32mm, 9 bit, gray Scale / natural binary. Too big? Jay

Reply to
happyhobit

well I could live with that, can you give me the type ? thanks, Stef 9 bit, gray Scale /

Reply to
Stef Mientki

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Jay

Reply to
happyhobit

"Stef Mientki" schreef in bericht news:bmhest$53$ snipped-for-privacy@odysseus.uci.kun.nl...

With that accuracy you can use a potentiometer. Vishay has some. Don't look under potentiometers, but at this location:

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Maybe model 140-3-???? (continous rotation) is useable. Lifetime 500000 revolutions, not too impressive.

There are others, but your space is really tight.

Reply to
Frank Bemelman

thanks Jay, but it's much to "thick" or "heigh", >8 mm ;-( Stef

Reply to
Stef Mientki

Thanks Frank, very nice site, I've bookmarked it, but indeed all potmeters have too much height ;-( Stef

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Reply to
Stef Mientki

Absolute might be tough. US Digital has some relative encoders that are only about 11.4 mm thick and 21 mm diameter.

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Reply to
Rich Webb

Relative? Sorry but it's Absolute or Incremental.

Jay

Reply to
happyhobit

Thanks, that's indeed almost within my limits. Stef

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Reply to
Stef Mientki

Are you looking for an absoluut (absolute) or incremental encoder?

For what application?

If all you're looking for is a digital panel encoder than Grayhill, Panasonic, Tasoku, CTS, Clarostat and Bourns all make products that would do what you want.

What do you want?

Jay

Reply to
happyhobit

the best would an "absolute", but I can live with incremental.

Goniometer, for measuring the angle of human joints, like the finger. The totalsize of this thing should be in the order of a pocket knife.

Most of them are potmeters, which have far too much height.

Well the E4 of US digital looks quiet suitable, a little bit smaller would even be nicer ;-)

Stef

Reply to
Stef Mientki

Just thought I'd check to see if you knew about other methods of doing this which are potentially very small - fiber optics and flex sensors.

Mitch Berkson

Reply to
Mitch Berkson

Does all the encoding have to be inside that package? A good quality pot and a(an?) SMT ADC might work.

Good Luck! Rich

Stef Mientki wrote:

Reply to
Rich Grise

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