Optical scanning device

Details Optical scanning device Optical scanning device

2006-02-07

2006-02-07

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S731000, C369S112230

Reexamination Certificate

active

06995886

ABSTRACT:
An optical scanning device is suitable for scanning a first information layer (23) of a first optical record carrier (21) with a first radiation beam (27) and a second information layer (47) of a second optical record carrier (45) with a second radiation beam (49). The device includes a radiation source (26) and a lens system (24). The radiation source (26) supplies the first and second radiation beams. The lens system has one optical axis (33) and operates: as a catadioptric system for the first radiation beam in order to transform this beam to a first focused radiation beam (35) having a first numerical aperture (NA1) so as to form a first scanning spot (36) in the position of the first information layer, and as a refractive system for the second radiation beam in order to transform this beam to a second focused radiation beam (52) having a second numerical aperture (NA2), different from the first numerical aperture, so as to form a second scanning spot (53) in the position of the second information layer.

REFERENCES:
patent: 4449212 (1984-05-01), Reno
patent: 4835380 (1989-05-01), Opheij et al.
patent: 6278560 (2001-08-01), Hendriks
patent: 0294902 (1988-12-01), None
patent: WO0038182 (2000-06-01), None
H. Angus MacLeod, “Thin-Film Optical Filtters”, Thired Edition, ISBN 0-85274-784-5, pp. iii-iv, vii-xi, 348-368 and 631-641.
Hiroshi Hatano et al., “A Plano-Convex Solid Immersion Mirror with a Small Aperture for Near-Field Optical Data Storage”, Int'l Symposium on Optical Memory, pp. 66-69, 2001, ISBN 4-89114-018-6.
B.H.W. Hendriks et al., “Designs and Manufacturing of Faar-Field High NA Objective Lenses for Optcal Recording”, pp. 413-414, SPIE 3749, 1999.
G. Bouwhuis et al., “Principles of Optical Disc Systems”, pp. 75-80, (Adam Hilger 1985), ISBN 0-85274-785-3.

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