Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2006-05-23
2006-05-23
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C369S112240, C359S719000
Reexamination Certificate
active
07050246
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 includes a glass body and the second lens is made of plastic. The signs of the temperature-dependences of the spherical aberration of the first and second lens are different, thereby reducing the temperature-dependence of the spherical aberration of the objective system as a whole.
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International Search Report From PCT/IB 02/01371.
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