They might not have invented it, but they produced the first consumer device:
http://en.wikipedia.org/wiki/Blu-ra...or_events_and_announcements_involving_members
http://www.pcworld.com/article/109617/sony_shows_first_bluray_recorder.html
http://www.blu-ray.com/ceatec2004/
Sony also made the first full length Blu-ray movie:
http://sev.prnewswire.com/entertainment/20051118/LAF08318112005-1.html
Sony has major media divisions - Sony Pictures and Sony-BMG Music, of course they packaged the format first to re-release their stuff on a new format, but BD as both a computer and music/movie storage format - was not invented by Sony. Sony is the only major HW maker with a software (music and film) arm, Yamaha Music Publishing does exist but they are tiny in comparison.
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