Objective optical element and optical pickup apparatus

Details Objective optical element and optical pickup apparatus Objective optical element and optical pickup apparatus

2007-03-14

2008-12-09

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080, C369S112260, C359S719000, C359S566000

Reexamination Certificate

active

07463568

ABSTRACT:
An objective optical element of an optical pickup apparatus has a magnification m1 satisfying the following formula for a light flux of the wavelength λ1:−1/7≦m1≦−1/25 and |m1|<|M1,where M1is an optical system magnification from the first light source to the first optical information recording medium for a light flux of the wavelength λ1. The objective optical element comprises a common region and an exclusive region. The exclusive region includes an exclusive diffractive structure having a function to suppress an increase of spherical aberration due to a raise of atmospheric temperature. A light flux of a wavelength λ2. having passed through the exclusive diffractive structure intersects with the optical axis at a position different from the position of the converged light spot formed on the information recording plane of the second optical information recording medium.

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