Yoshiyuki Tsukai

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Saitama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Crystal optic lens and an optical system for an optical pickup device
- Patent number 5,867,315
- Issue date Feb 2, 1999
- Pioneer Electronic Corporation
- Katsuhiro Koike
- G02 - OPTICS
Information Patent Grant
Method and apparatus for determining an optical disc type
- Patent number 5,710,749
- Issue date Jan 20, 1998
- Pioneer Electronic Corporation
- Yoshiyuki Tsukai
- G11 - INFORMATION STORAGE
Information Patent Grant
Optically recorded data reading apparatus with inclination controller
- Patent number 4,636,628
- Issue date Jan 13, 1987
- Pioneer Electronic Corporation
- Yoshiyuki Tsukai
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information pickup apparatus
- Patent number 4,633,454
- Issue date Dec 30, 1986
- Pioneer Electronic Corporation
- Yoshiyuki Tsukai
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical pickup device
- Patent number 4,624,526
- Issue date Nov 25, 1986
- Pioneer Electronic Corporation
- Yoshiyuki Tsukai
- G06 - COMPUTING CALCULATING COUNTING