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07-30-2020, 08:16 AM - 4 Likes   #1
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Imaging Resource article on IBIS

The article is specifically about the IBIS implementation used by Olympus, but of course much of the information also applies to Pentax and other brands.

INSIDE Image Stabilization: Olympus takes us on a geek’s tour of what makes IS work

At their most fundamental, the way in which modern IBIS systems work is still very much like those in the early days, just with greater precision and sophistication. A number of permanent magnets arranged in pairs on the fixed portion of the sensor-shift assembly interact with electromagnetic forces generated by coils attached to the floating sensor carrier plate.

These are what's known as voice coils, and together with the magnets positioned above and below them they form voice-coil motors, so named because loudspeakers, headphones and the like use the same sort of mechanism to turn electricity into sound vibrations. Running an electrical current through a coil of wire creates a magnetic field that will push or pull against a nearby permanent magnet depending on the polarity and amount of current flowing.

In a camera or lens, the force generated by the voice coil motors lets the IS system move the sensor or lens element in very small, precisely controlled increments.


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