Sensor size naming convention - confusing

Started Feb 20, 2013 | Discussions thread
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eaa
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Sensor size naming convention - confusing
Feb 20, 2013

I know the 4/3 sensor naming stems back from some old video tubes in the past, but can anyone explain the naming convention for all those other smaller sensor formats? I find it quite confusing... How can a so called 1" sensor being 13.2 x 8.8 (diagonal ~15.9 mm) be called a 1 inch sensor? And so forth... How are those measurements/names derived? To me they simply don't add up :/ It would be nice to have a sensible, logical and comparable standard for this, right?

(ill. from DPR):

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