Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2007-04-25
2010-06-01
Tran, Thang V (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044250, C369S044270
Reexamination Certificate
active
07729221
ABSTRACT:
The invention provides an optical disk device that has a laser unit including a first objective lens and a second objective lens. A numerical aperture of the first objective lens is different from a numerical aperture of the second objective lens. The optical disk device has a first focus driver that detects a first voltage value indicating the value of a driving voltage to drive the first objective lens when light beams are irradiated onto the surface of an optical disk via the first objective lens and a focus is achieved. The optical disk device has a second focus driver that detects a second voltage value indicating the value of a driving voltage to drive the second objective lens when light beams are irradiated onto the recording surface of said optical disk via the second objective lens and a focus is achieved. The optical disk device has a controller that discriminates the type of an optical disk, based on a difference between the first voltage value and the second voltage value.
REFERENCES:
patent: 2005085351 (2005-03-01), None
patent: 2005183001 (2005-07-01), None
Kashiwabara Yoshiro
Masuda Tsukasa
Sagata Shingo
Tsuji Hiroshi
Dickinson Wright PLLC
Panasonic Corporation
Tran Thang V
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