Now for a third company with unique technology out of the sensor business - Foveon. For those of you unfamiliar with Foveon, they started out to build three-chip, prism-based color cameras with custom CMOS sensors. When this market was discovered to be way too small, they acquired Dick Merrill and his inventions from National Semiconductor and developed sensors with stacked RGB photodiodes in which the silicon itself provided color separation. These were intended for DSLRs, then point-and-shoot cameras and then mobile phones. Didn't happen so, eventually, their only photographic customer, Sigma Photo, bought the assets for about 10 cents on the dollar and moved the work to Japan. Full disclosure - I sold Foveon sensors in the non-photo markets for about 10 years. Aside from Sigma, the only enduring legacy is the F13 on the ESA ExoMARS rover (now scheduled for an October 2028 launch).
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