Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-07-03
2007-07-03
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S717000, C359S719000, C369S112240
Reexamination Certificate
active
10475380
ABSTRACT:
An optical scanning device for scanning an information layer (104) of an optical record carrier (102) includes a radiation source (110) for generating a radiation beam (108) and a high-NA objective system (118) for converging the radiation beam on the information layer. The objective system includes a first lens (116) and a second lens (117). The first lens and the second lens are made of plastic. The signs of the temperature-dependence of the spherical aberration of the first and second lens are different and the magnitudes of the temperature-dependence of the spherical aberration of the two lenses is substantially equal such that the temperature-dependence of the spherical aberration of the objective system as a whole is reduced to less than 30 mλ OPDrms for a temperature change of 30 K.
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BHW Hendriks et al; “Single Digital Video Recording/Digital Versatile Disk objective and plastic Digital Video Recording objective”; Jpn. J. Appl Phys.; vol. 41 (2002); pp. 1791-1797.
Search report from U.S. App. No. 10/475,364—PCT/IB02/01372.
Koninklijke Philips Electronics , N.V.
Sugarman Scott J.
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