Inventor
UMEDA MARIKO
JP13 patents
⚠️ This page may combine multiple inventors who share the name “UMEDA MARIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
9 patentsUS5361244ANov 1, 1994
Optical head and information recording apparatus
HITACHI LTD93 citations96
US6807133B2Oct 19, 2004
Optical head and optical disk apparatus
HITACHI LTD25 citations92
US5784347AJul 21, 1998
Optical disk device having optical phase compensator
HITACHI LTD20 citations92
US5511050AApr 23, 1996
Focus error detecting method and optical head using the same
HITACHI LTD21 citations92
US5490133AFeb 6, 1996
Optical information processing apparatus and method of controlling position of optical spot and reproducing signals
HITACHI LTD22 citations92
US7558178B2Jul 7, 2009
Information recording/reproducing method and information recording/reproducing apparatus
HITACHI LTD4 citations63
US7746734B2Jun 29, 2010
Optical disk apparatus and tracking method
HITACHI LTD3 citations62
US7068572B2Jun 27, 2006
Optical head and optical disk apparatus
HITACHI LTD4 citations62
US7352673B2Apr 1, 2008
Recording method and recording apparatus
HITACHI LTD0 citations51