Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-12-25
2007-12-25
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112050
Reexamination Certificate
active
10875304
ABSTRACT:
An optical pickup includes a first optical source producing a first optical beam having a wavelength λ1, a second optical source producing a second optical beam having a wavelength λ2(λ1<λ2), and a single objective lens focusing any of the first and second optical beams to an optical recording medium, the first optical beam is incident to the objective lens as a parallel beam and the second optical beam is incident to the objective lens as a divergent optical, wherein an aperture is provided at a front side of the objective lens with offset from a principal point at the front side by a distance t given by an equationin-line-formulae description="In-line Formulae" end="lead"?t=L−NA1·f/tan(asin(NA2obj)),in-line-formulae description="In-line Formulae" end="tail"?wherein f represents a focal distance of the objective lens, NA1represents the numerical aperture at the side of the image surface when the first optical source is turned on, NA2obj represents the numerical aperture at the front side when the second optical source is turned on, and L represents the object distance at the time when the second optical source is turned on.
REFERENCES:
patent: 5105408 (1992-04-01), Lee et al.
patent: 6515955 (2003-02-01), Takeuchi
patent: 6545958 (2003-04-01), Hirai et al.
patent: 6667943 (2003-12-01), Maruyama et al.
patent: 6870805 (2005-03-01), Arai et al.
patent: 2002/0093902 (2002-07-01), Hirai et al.
patent: 2002/0191502 (2002-12-01), Hirai
patent: 2003/0072247 (2003-04-01), Hirai
patent: 2003/0151999 (2003-08-01), Hirai et al.
patent: 2003/0227859 (2003-12-01), Hirai
patent: 2004/0257958 (2004-12-01), Kimura et al.
patent: 1022731 (2000-07-01), None
patent: 7-57589 (1995-03-01), None
patent: 8-55363 (1996-02-01), None
patent: 9054977 (1997-02-01), None
patent: 9-73654 (1997-03-01), None
patent: 2000187870 (2000-07-01), None
patent: 2001-216676 (2001-08-01), None
patent: 2002-107617 (2002-04-01), None
patent: 2003-067972 (2003-03-01), None
“Blue/DVD/CD Compatible Optical Head with three wavelengths and a wavelength selective filter” by Ryuichi Katayama et al., ISOM 2001, pp. 30-31.
“Introduction to Diffraction Optical Elements”, Optical Design Study Group, Optical Society of Japan (ed)., The Physical Society of Japan, pp. 118-121, no date.
Danielsen Nathan
Dickstein & Shapiro LLP
Tran Thang V.
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