What happened to the cylindrical lens?
It would appear that the mystery is solved: (From: Vlad Chekavinskii (vchek@usa.net).) Dear Sam! I’ve just read your greatly updated article on CD repairment and found out that your investigation on SONY KSS pickups is pretty similar with mine (I’ve spent a half year aligning KSS210A and was successful with it at last), but your uncertainty about where the astigmatic element should be very disappointed me… because I’ve screwed my head chewing out the same thing! Nonetheless I’ve come to conclusion that the THICK mirror is thick very intentionally – the astigmatism of flat parallel surface plate turned on a 45 degree angle is a very sizable thing and corresponds with dimensions of ABCD photodiodes. (From: Sam). Fabulous! That has to be it. I even just did an experiment with a 1.5 inch think piece of Plexiglas and a lens – the astigmatism was clearly visible and it isn’t a subtle effect. The astigmatism of the laser diode may contribute but probably is small compared to the result of p
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- What happened to the cylindrical lens?
