P

Inventor

TAKEDA TADASHI

JP66 patents
⚠️ This page may combine multiple inventors who share the name “TAKEDA TADASHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SANKYO SEIKI SEISAKUSHO KK

18 patents
US6084844AJul 4, 2000

Optical head assembly

SANKYO SEIKI SEISAKUSHO KK21 citations93
US5648950AJul 15, 1997

Hologram integrated with a beam splitter to separate a plurality of polarized reflected light beams

SANKYO SEIKI SEISAKUSHO KK27 citations93
US5828643AOct 27, 1998

Optical pickup head apparatus

SANKYO SEIKI SEISAKUSHO KK22 citations92
US5739952AApr 14, 1998

Polarizing beam splitter and optical head assembly

SANKYO SEIKI SEISAKUSHO KK36 citations92
US6775065B2Aug 10, 2004

Diffraction element and optical pickup device

SANKYO SEIKI SEISAKUSHO KK13 citations84
US6438075B1Aug 20, 2002

Light-pick-up device and light source unit incorporated in the same

SANKYO SEIKI SEISAKUSHO KK17 citations82
US6633530B1Oct 14, 2003

Optical pickup apparatus with light source unit including first light source and common light receiving section

SANKYO SEIKI SEISAKUSHO KK9 citations74
US6552317B1Apr 22, 2003

Optical pickup device

SANKYO SEIKI SEISAKUSHO KK8 citations74
US5687152ANov 11, 1997

Optical pickup system

SANKYO SEIKI SEISAKUSHO KK12 citations74
US6016300AJan 18, 2000

Optical pickup head apparatus

SANKYO SEIKI SEISAKUSHO KK12 citations73
US5761174AJun 2, 1998

Optical pickup device with split hologram element that diffracts light in direction parallel to track

SANKYO SEIKI SEISAKUSHO KK16 citations73
US6445671B1Sep 3, 2002

Optical pickup device having a shielding protection

SANKYO SEIKI SEISAKUSHO KK12 citations72
US6167017ADec 26, 2000

Optical head assembly having means for detecting tracking errors based on astigmatisms generated by returning beams

SANKYO SEIKI SEISAKUSHO KK11 citations72
US4943129AJul 24, 1990

Tapered optical waveguide, waveguide type optical head using same and optical waveguide

SANKYO SEIKI SEISAKUSHO KK8 citations72
US5793733AAug 11, 1998

Polarizing beam splitter and method for manufacturing same

SANKYO SEIKI SEISAKUSHO KK9 citations71
US6961297B2Nov 1, 2005

Optical head device

SANKYO SEIKI SEISAKUSHO KK3 citations63
US6489599B2Dec 3, 2002

Optical pickup device

SANKYO SEIKI SEISAKUSHO KK4 citations63
US6151288ANov 21, 2000

Optical head assembly

SANKYO SEIKI SEISAKUSHO KK4 citations63

NIDEC SANKYO CORP

11 patents

TAKEDA TADASHI

5 patents

MINAMISAWA SHINJI

3 patents

TSURUTA TOSHIFUMI

2 patents

YANAGISAWA KATSUSHIGE

2 patents

NIPPON STEEL CORP

2 patents

EC SHOWA DENKO K K

2 patents

NAGATA AKIHIRO

1 patent

TAKEDA SEIKI CO LTD

1 patent

WADE TATSUKI

1 patent

ALPS ELECTRIC CO LTD

1 patent

SAMSUNG ELECTRONICS CO LTD

1 patent

Showing the top 50 of 66 patents by PatentIndex Score.