Inventor
WATANABE MASATERU
JP8 patents
⚠️ This page may combine multiple inventors who share the name “WATANABE MASATERU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
5 patentsUS4742218AMay 3, 1988
Focus error detection apparatus utilizing focusing an front and rear sides of focal planes
HITACHI LTD44 citations91
US5418763AMay 23, 1995
Disc recording system
HITACHI LTD48 citations90
US5016237AMay 14, 1991
Prism optics stable with respect to wavelength and temperature variations and optical information processing apparatus
HITACHI LTD7 citations73
US6320836B1Nov 20, 2001
Apparatus for ensuring operational clearance between a rotating disc type medium and a disc cartridge enclosing the medium
HITACHI LTD8 citations72
US4807212AFeb 21, 1989
Correcting for comatic aberration in an optical head of an optical disk apparatus
HITACHI LTD13 citations70