Afocal lens, optical head, optical disk apparatus and...

Details Afocal lens, optical head, optical disk apparatus and... Afocal lens, optical head, optical disk apparatus and...

2007-12-28

2010-10-19

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Afocal

C369S044230, C369S044320, C369S112010

Reexamination Certificate

active

07817355

ABSTRACT:
The present invention provides an afocal lens for an optical head that can ensure WD while satisfying NA, the optical head, an optical disk apparatus, a computer, an optical disk player, and an optical disk recorder. Using a blue-violet laser beam source with wavelength of about 400 nm, and in an optical head compatible to optical disks having different protective substrate thickness, an afocal lens that expands a diameter of light flux of light from a collimating lens and emits the light as substantially parallel light to an objective lens is provided between the collimating lens and the objective lens. The configuration makes it possible to ensure WD while satisfying NA.

REFERENCES:
patent: 7031076 (2006-04-01), Kimura et al.
patent: 7085203 (2006-08-01), Shiono et al.
patent: 7133332 (2006-11-01), Kimura
patent: 7-98431 (1995-04-01), None
patent: 10-10308 (1998-01-01), None

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