Hiroshi Sakai

Person

Suwa-gun, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical head device that prevents the displacement of the optical a...
- Patent number 7,414,926
- Issue date Aug 19, 2008
- NIDEC SANKYO CORPORATION
- Hiroshi Kubota
- G11 - INFORMATION STORAGE
Information Patent Grant
Prism, method of producing a prism, and optical head apparatus usin...
- Patent number 7,361,250
- Issue date Apr 22, 2008
- NIDEC SANKYO CORPORATION
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical head apparatus
- Patent number 7,272,100
- Issue date Sep 18, 2007
- NIDEC SANKYO CORPORATION
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of analyzing astigmatic difference and method of correcting...
- Patent number 7,175,087
- Issue date Feb 13, 2007
- NIDEC SANKYO CORPORATION
- Hiroshi Sakai
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Aberration compensating device and optical head device
- Patent number 7,164,521
- Issue date Jan 16, 2007
- NIDEC SANKYO CORPORATION
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Grant
Light intensity distribution measuring method and light intensity d...
- Patent number 7,092,080
- Issue date Aug 15, 2006
- NIDEC SANKYO CORPORATION
- Hiroshi Sakai
- G01 - MEASURING TESTING
Information Patent Grant
Two-wavelength optical pickup device with step-like diffraction ele...
- Patent number 6,873,591
- Issue date Mar 29, 2005
- Sankyo Seiki Mfg. Co., Ltd.
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Grant
Apparatus and method for measuring surface shape
- Patent number 6,651,029
- Issue date Nov 18, 2003
- Kabushiki Kaisha Sankyo Seiki Seisakusho
- Hiroshi Sakai
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL RECORDING DISK APPARATUS
- Publication number 20070097834
- Publication date May 3, 2007
- NIDEC Sankyo Corporation
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Diffraction element and optical disk device
- Publication number 20060280098
- Publication date Dec 14, 2006
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Optical disk device and adjusting method therefor
- Publication number 20060221798
- Publication date Oct 5, 2006
- Yasuyuki Tsukioka
- G11 - INFORMATION STORAGE
Information Patent Application
Diffraction element and optical disk device
- Publication number 20060215531
- Publication date Sep 28, 2006
- Hiroshi Sakai
- G02 - OPTICS
Information Patent Application
Optical recording device
- Publication number 20060158992
- Publication date Jul 20, 2006
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Aberration compensating device and optical head device
- Publication number 20060012846
- Publication date Jan 19, 2006
- Sankyo Seiki Mfg. Co., Ltd.
- Hiroshi Sakai
- G02 - OPTICS
Information Patent Application
Optical head device
- Publication number 20050276201
- Publication date Dec 15, 2005
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Optical head device
- Publication number 20050265204
- Publication date Dec 1, 2005
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Optical head device
- Publication number 20050265143
- Publication date Dec 1, 2005
- Hiroshi Kubota
- G11 - INFORMATION STORAGE
Information Patent Application
Optical head device
- Publication number 20050201219
- Publication date Sep 15, 2005
- Tooru Hotsuta
- G11 - INFORMATION STORAGE
Information Patent Application
Method of analyzing astigmatic difference and method of correcting...
- Publication number 20050156044
- Publication date Jul 21, 2005
- Hiroshi Sakai
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
Prism, method of producing a prism, and optical head apparatus usin...
- Publication number 20050128608
- Publication date Jun 16, 2005
- Hiroshi Sakai
- G02 - OPTICS
Information Patent Application
Method of analyzing astigmatic difference and method of correcting...
- Publication number 20050051628
- Publication date Mar 10, 2005
- Hiroshi Sakai
- G02 - OPTICS
Information Patent Application
Optical head apparatus
- Publication number 20050030879
- Publication date Feb 10, 2005
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Optical head device
- Publication number 20040184366
- Publication date Sep 23, 2004
- Hiroshi Kubota
- G11 - INFORMATION STORAGE
Information Patent Application
Light intensity distribution measuring method and light intensity d...
- Publication number 20040156040
- Publication date Aug 12, 2004
- Hiroshi Sakai
- G01 - MEASURING TESTING
Information Patent Application
Optical pickup device and method for designing the same
- Publication number 20020114257
- Publication date Aug 22, 2002
- Hiroshi Sakai
- G11 - INFORMATION STORAGE
Information Patent Application
Apparatus and method for measuring surface shape
- Publication number 20020082804
- Publication date Jun 27, 2002
- KABUSHIKI KAISHA SANKYO SEIKI SEISAKUSHO
- Hiroshi Sakai
- G01 - MEASURING TESTING

Hiroshi Sakai

Person

Patents Grantslast 30 patents

Optical head device that prevents the displacement of the optical a...

Prism, method of producing a prism, and optical head apparatus usin...

Optical head apparatus

Method of analyzing astigmatic difference and method of correcting...

Aberration compensating device and optical head device

Light intensity distribution measuring method and light intensity d...

Two-wavelength optical pickup device with step-like diffraction ele...

Apparatus and method for measuring surface shape

Patents Applicationslast 30 patents

OPTICAL RECORDING DISK APPARATUS

Diffraction element and optical disk device

Optical disk device and adjusting method therefor

Diffraction element and optical disk device

Optical recording device

Aberration compensating device and optical head device

Optical head device

Optical head device

Optical head device

Optical head device

Method of analyzing astigmatic difference and method of correcting...

Prism, method of producing a prism, and optical head apparatus usin...

Method of analyzing astigmatic difference and method of correcting...

Optical head apparatus

Optical head device

Light intensity distribution measuring method and light intensity d...

Optical pickup device and method for designing the same

Apparatus and method for measuring surface shape