3 ms·
Is this a quadrature encoder or something more fancy?
by RicoElectrico 3y ago
Is this a quadrature encoder or something more fancy?
- anonymousiam 3y agoI updated my comment above with a link. Just an ordinary quadrature encoder, but revolutionary back in the day.
- jacquesm 3y agoDefinitely not invented by HP though. https://www.usdigital.com/blog/who-made-the-first-optical-encoder/ https://www.usdigital.com/blog/who-made-the-first-optical-en...
- anonymousiam 3y agoOkay perhaps not, but in my experience, HP was the first company to use them as a human interface device (HID).
- jacquesm 3y agoLong before then I saw them on CNC gear that had nothing to do with HP.
- anonymousiam 3y agoWhat year? I first encountered one on a HP 8568 Spectrum Analyzer in 1978. They were also used on the HP 8672 synthesizer a year before that.
- jacquesm 3y agoThe company that made the ones I'm talking about is called Haidenhain and they were making these long before then. I think they go back as far as the 50's but I can't document that. But you'll find them all over old CNC gear.
- anonymousiam 3y agoObviously the 50's was before the LED was invented. Did they use light bulbs? Also, they would also have had to use CdS photo-resistors instead of photo-transistors. Probably required a few vacuum tubes for the interface too. Seems like a lot of effort vs. a simple potentiometer.