post #3481 of 3481

Not a picture per se, but from this link http://www.theabsolutesound.com/articles/rocky-mountain-audio-fest-2014-analog-and-solid-state-electronics/?utm_campaign=Newsletter&utm_medium=email&utm_source=email-303 you can see and research more about the first modern era optical  phono cartridges available outside Japan. 

 

Some might remember optical carts of the past - Toshiba C-100P http://www.vinylengine.com/library/aurex-toshiba/c-100p.shtml - and Kenwood also had a similar unit at about the same time. 40+ years of technological advance have obviously produced conditions for reintroduction of optical cartridge. The advantages over any magnetic cartridge, be it moving magnet or moving coil, are GREAT - the most significant one is the absence of hysteresis that is a part of anything involving electromagnetic induction.

 

Original optical cartridges used bulbs as a light source; many bulbs (and hence carts...) died before the diamond was worn out - and at the anything but inconsiderable cost that more or less sealed the fate of optical cartridges in the market.

 

And then there was LED ...