Scanning device including an objective system formed of a...

Details Scanning device including an objective system formed of a... Scanning device including an objective system formed of a...

2006-03-07

2006-03-07

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C369S112230

Reexamination Certificate

active

07009744

ABSTRACT:
An optical scanning device (1) for scanning an information layer (4) of an optical record carrier (2), the device (1) comprising a radiation source (11) for generating a radiation beam (12, 15, 20) and an objective system (18) for converging the radiation beam on the information layer, the information layer being covered by a transparent layer (3) of thickness td and refractive index nd. The objective system comprises a lens formed of a single material. The lens satisfies the condition: Fomula (I), where t is the thickness of the lens, FWD is the free working distance between the lens (18) and the carrier (2), where t, td and FWD are expressed in millimeters, and where FWD+td
d<0.51.

REFERENCES:
patent: 6147956 (2000-11-01), Jutte et al.
patent: 6678096 (2004-01-01), Sugi et al.

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