Optical scanning device with two-wavelength laser for HD and...

Details Optical scanning device with two-wavelength laser for HD and... Optical scanning device with two-wavelength laser for HD and...

2006-03-07

2006-03-07

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080, C369S112090

Reexamination Certificate

active

07009928

ABSTRACT:
In an optical scanning device for scanning both a high-density, HD, record carrier (38) and a low-density, LD, record carrier (18), a two-wavelength diode laser (50) is used for generating the HD scanning beam and the LD scanning beam. By arranging a composite diffraction element (60) close to the diode laser (50), which element has a first diffraction structure (63), for combining the HD beam and the LD beam, and a second diffraction structure (64), which acts as a lens for either the LD beam or the HD beam only, a compact device is obtained, which is suitable for writing the LD information layer (40).

REFERENCES:
patent: 5467335 (1995-11-01), Braat
patent: 5615200 (1997-03-01), Hoshino et al.
patent: 5717674 (1998-02-01), Mori et al.
patent: 5986998 (1999-11-01), Park
patent: 6643245 (2003-11-01), Yamamoto et al.
patent: 6791932 (2004-09-01), Maruyama
patent: 11185282 (1999-07-01), None
Electronic translation of JP 11-185282.

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