Coupling optical system, optical element and optical pickup...

Details Coupling optical system, optical element and optical pickup... Coupling optical system, optical element and optical pickup...

2007-12-20

2009-06-02

Healy, Brian M (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S031000, C385S088000, C385S092000, C369S112260, C369S112200, C369S112060

Reexamination Certificate

active

07542637

ABSTRACT:
The present invention relates to a coupling optical system, an optical element, and an optical pickup apparatus. A coupling optical system is provided for use in an optical pickup apparatus and is arranged between a light source and an objective lens of the optical pickup apparatus. The coupling optical system includes: a first optical element with a power; and a second optical element with a positive power. The first optical element includes an optical surface, an out-effective-aperture section surrounding the optical surface, and a light-reduction structure arranged on the out-effective-aperture section. When a non-parallel light flux emitted from the light source enters into the out-effective-aperture section, the light-reduction structure reduces a light flux to be emitted from the second optical element in a direction getting closer to an optical axis of the second optical element.

REFERENCES:
patent: 6671247 (2003-12-01), Arai et al.
patent: 7173897 (2007-02-01), Arai et al.
patent: 7460460 (2008-12-01), Kimura
patent: 7463570 (2008-12-01), Kimura et al.
patent: 2008/0212924 (2008-09-01), Kimura
patent: 2002-82280 (2002-03-01), None

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