Optical pickup apparatus and optical disc apparatus

Details Optical pickup apparatus and optical disc apparatus Optical pickup apparatus and optical disc apparatus

2006-11-20

2009-06-23

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112240, C369S112250, C369S112260

Reexamination Certificate

active

07551371

ABSTRACT:
There is provided an optical pickup apparatus which includes a light source that generates light irradiating an optical recording medium; and an objective lens that collects the light irradiated from the light source on a recording surface of the recording medium, which further includes a coupling lens arranged on an optical path between the light source and the objective lens. In the optical pickup apparatus, a surface shape of the coupling lens is formed so that a preset spherical aberration amount is generated in the light irradiated from the light source at a position settled corresponding to a shift amount of the objective lens and where the light irradiated from the light source passes through the coupling lens, when the objective lens shifts.

REFERENCES:
patent: 2004/0150892 (2004-08-01), Takeuchi et al.
patent: 2004 247034 (2004-09-01), None

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