Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2007-10-16

2007-10-16

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C369S112010, C369S112160

Reexamination Certificate

active

11340588

ABSTRACT:
An optical pickup apparatus is provided with a light source device to emit selectively an ordinary polarized light ray and an extraordinary polarized light ray by controlling a polarization condition of a light flux having a wavelength of λ1; and a light converging optical system. An objective lens has a phase structure made of a doubly refracting medium in which an ordinary ray refractive index nofor the ordinary polarized light ray is different from an extraordinary ray refractive index ne(ne≠no) for the extraordinary polarized light ray so that the phase structure has a function for not changing a transmitted wavefront of an incident light ray being one of the ordinary polarized light ray and the extraordinary polarized light ray and for changing a transmitted wavefront of an incident light ray being the other one of the ordinary polarized light ray and the extraordinary polarized light ray.

REFERENCES:
patent: 2005/0063282 (2005-03-01), Takada et al.
patent: 2005/0254399 (2005-11-01), Kimura
patent: 2006/0002280 (2006-01-01), Ogiwara
patent: 2006/0062103 (2006-03-01), Ogiwara et al.
patent: 2006/0077792 (2006-04-01), Kimura et al.
patent: 2006/0077793 (2006-04-01), Kimura et al.
patent: 2006/0077861 (2006-04-01), Katsuma et al.
patent: 2006/0164954 (2006-07-01), Hashimura

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