Optical pickup apparatus and focal-point adjusting method

Details Optical pickup apparatus and focal-point adjusting method Optical pickup apparatus and focal-point adjusting method

2011-03-29

2011-03-29

Ortiz Criado, Jorge Leonardo (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120, C369S044230, C369S112030, C369S044420

Reexamination Certificate

active

07916612

ABSTRACT:
An optical pickup apparatus includes an astigmatic element, an angle adjusting element for contradicting propagation directions of luminous fluxes within four different luminous flux regions out of a reflected light, a polarization adjusting element. Two of the luminous flux regions are placed in a direction in which aligned are a set of opposite angles made by the two mutually crossing straight lines respectively parallel to a first convergence direction and a second convergence direction vertical to the first convergence direction by the astigmatic element, and the remaining two luminous flux regions are placed in a direction in which an alternate set of opposite angles are aligned. The polarization adjusting element differentiates polarization directions of luminous fluxes which are selected out of the luminous fluxes within the four luminous flux regions and which are adjacent in a peripheral direction in which the optical axis of reflected light serves as an axis.

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patent: 2008/0165655 (2008-07-01), Saitoh et al.
patent: 2006252716 (2006-09-01), None
patent: 2006260669 (2006-09-01), None

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