Zone phase correcting lens and optical head device

Details Zone phase correcting lens and optical head device Zone phase correcting lens and optical head device

2005-06-10

2008-12-30

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C369S112230

Reexamination Certificate

active

07471611

ABSTRACT:
A zone phase correcting lens wherein a change in the third-order spherical aberration or the like is small in the case of a change in temperature and an optical head device having the zone phase correcting lens used as an objective lens. A minus sign is appended to the height measurement of a step formed so as to make the lens thickness in the optical axis thinner toward the outer region and a plus sign is appended to a step formed so as to make the lens thickness thicker toward the outer region. Supposing that D is an absolute value of the sum of the height measurements of the steps having the minus sign on the first surface and the second surface and E is an absolute value of the sum of the height measurements of the steps having the plus sign on the first surface and the second surface, a wavelength λ1and a refractive index N1of the lens for a first laser beam satisfy the following conditions:in-line-formulae description="In-line Formulae" end="lead"?10×λ1<{D×(N1−1)}<30×λ1in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2×E<D.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6363037 (2002-03-01), Yamazaki
patent: 6999399 (2006-02-01), Honda
patent: 7035193 (2006-04-01), Takeuchi et al.
patent: 2001-051192 (2001-02-01), None
patent: 2002-215447 (2002-07-01), None
patent: 5518684 (2004-06-01), None

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