Optical pickup apparatus for recording or reproducing...

Details Optical pickup apparatus for recording or reproducing... Optical pickup apparatus for recording or reproducing...

2007-12-17

2009-12-29

Young, Wayne R (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

07639589

ABSTRACT:
An objective lens of an optical pickup apparatus converges a divergent light flux onto an information recording surface. The following conditional formula is satisfied:in-line-formulae description="In-line Formulae" end="lead"?|δSA1/δU|·|δU|+|δSA2/δT|·|δT|≦0.07 λrmsin-line-formulae description="In-line Formulae" end="tail"?where λ represents a wavelength of a light source, δSA1/δU represents a change of a spherical aberration for an object-to-image distance change δU (|δU|≦0.5 mm) and δSA2/δT represents a change of spherical aberration for a temperature change δT (|δT|≦30° C.), the object-to-image distance is a distance between the light source (a light emitting point) and the information recording surface.

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