Optical head having light reflection prevention film, and...

Details Optical head having light reflection prevention film, and... Optical head having light reflection prevention film, and...

2005-12-20

2005-12-20

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

C369S112250

Reexamination Certificate

active

06977870

ABSTRACT:
An optical head has objective lenses that converge a light beam, a light-emitting surface that faces an optical recording medium with an air layer therebetween and from which the light beam converged by the objective lenses exits towards the optical recording medium, and a light reflection preventing film that is provided at the light-emitting surface. A recess is formed in the light-emitting surface, and the light reflection preventing film is provided inside the recess.

REFERENCES:
patent: 6633513 (2003-10-01), Kim et al.
patent: 6683846 (2004-01-01), Kishima et al.
patent: 6687196 (2004-02-01), Ueyanagi
patent: 6721262 (2004-04-01), Jordache et al.
patent: 6781926 (2004-08-01), Ishizaki et al.
patent: 910 078 (1999-04-01), None
patent: 2001-235603 (2001-08-01), None

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