Objective optical system and optical information...

Details Objective optical system and optical information... Objective optical system and optical information...

2009-01-22

2011-11-29

Chow, Van (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080

Reexamination Certificate

active

08068401

ABSTRACT:
There is provided an objective optical system used for information recording/reproducing for three types of optical discs. The objective optical system includes an objective lens, and a diffraction structure formed on an optical surface. The diffraction structure includes a first area for contributing to converging the third light beam. The first area includes first and second steps defined by first and second optical path difference functions, respectively. The first step is configured such that diffraction orders at which diffraction efficiencies for the first, second and third light beams are maximized are 1storder, 0-th order and 0-th order, respectively. The first step satisfies a condition:in-line-formulae description="In-line Formulae" end="lead"?−0.36×102<P12×f1+5.0×103×(n1−n3)<1.80×102  (1)in-line-formulae description="In-line Formulae" end="tail"?The second step is configured such that diffraction orders at which diffraction efficiencies for the first, second and third light beams are maximized are 2ndorder, 1storder and 1storder, respectively.

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English language Abstract of JP 2006-164498 A.
English language Abstract of JP 2006-134366 A.
English language Abstract of JP 2006-012394 A.

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