Optical element and optical pickup apparatus

Details Optical element and optical pickup apparatus Optical element and optical pickup apparatus

2011-08-09

2011-08-09

Giesy, Adam R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120

Reexamination Certificate

active

07995446

ABSTRACT:
The present invention relates to an optical element for use in an optical pickup apparatus and an optical pickup apparatus. An optical element is provided for use in an optical pickup apparatus which records or reproduces information by converging a light flux from a light source onto an information recording surface of an optical disc and by receiving a light flux reflected by the information recording surface by a photodetector. The optical element includes: a first area including an optical axis of the optical element; and a second area surrounding the first area and including a diffractive structure in a radial shape. The first area transmits a light flux from the light source, and the second area diffracts a light flux with the predetermined wavelength from the light source.

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patent: 2005-216430 (2005-08-01), None
M. Born et al., Principles of Optics: Electromagnetic Theory of Propagation, Interference and Diffraction of Light, 7th edition, Cambridge University Press, Cambridge, United Kingdom, pp. 837-840 (1999).
Notice of Reasons for Refusal dated Mar. 9, 2011 from Japanese Patent Office in corresponding Japanese Patent Application No. 2007-033608.

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