By finding the inventor's name on the SL1200 article or the Trchnics article on Wikipedia, Shuichi Obata.
Then searching at espacenet advanced search with inventor's name and Matsushita or record as keyword etc...
These are 2 relevant patents already found:
Pickup arm device:
https://worldwide.espacenet.com/publicationDetails/mosaics?CC=US&NR=4203606A&KC=A&FT=D&ND=3&date=19800520&DB=EPODOC&locale=en_EP
Rotational speed signal sensor:
https://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=11&ND=3&adjacent=true&locale=en_EP&FT=D&date=19811124&CC=US&NR=4302692A&KC=A
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