Optical scanning device and method for determining focus...

Details Optical scanning device and method for determining focus... Optical scanning device and method for determining focus...

2009-05-12

2011-11-01

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044320, C369S112010

Reexamination Certificate

active

08050169

ABSTRACT:
The optical scanning device [10] is arranged for scanning a record carrier [1]. The record carrier has an outer face [7]. The scanning device comprises a radiation source [11] for generating a radiation beam [12] and an objective system [25] having an exit face [26] arranged for evanescent coupling of the radiation beam between the exit face and the outer face and for converging the radiation beam to a focus [27]. A tilt measuring system [67, 77] provides a tilt signal [87; 88] representing a tilt angle between the objective system and the record carrier. A control unit [95] determines a distance signal representing a distance between the exit face and the focus from the tilt signal.

REFERENCES:
patent: 7535808 (2009-05-01), Ishimoto et al.
patent: 7613082 (2009-11-01), Ishimoto et al.
patent: 7808866 (2010-10-01), Lee et al.
patent: 7885163 (2011-02-01), Shin
patent: 2006/0092783 (2006-05-01), Andersen et al.
patent: 2008/0106982 (2008-05-01), Seo et al.

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