Optical pickup and objective optical system for use in the same

Details Optical pickup and objective optical system for use in the same Optical pickup and objective optical system for use in the same

2006-02-17

2010-02-02

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010

Reexamination Certificate

active

07656769

ABSTRACT:
An optical pickup (1) includes a light source (6) capable of emitting laser beams of various wavelengths and an objective optical system (2). The objective optical system (2) includes at least two wavefront conversion surfaces (13a) and (16a) and an objective lens (10). The at least two wavefront conversion surfaces (13a) and (16a) convert a wavefront of any laser beam entered therein into a different wavefront in response to the kind of an optical information recording medium (3) corresponding to the laser light. The objective lens (10) focuses the laser beam came out of the wavefront conversion surface (16a) on an optical information recording surface (3R). The optical pickup (1) satisfies the following condition for every wavelength of the corresponding laser beams:in-line-formulae description="In-line Formulae" end="lead"?|SCMAX|<0.036  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein SCMAXis the maximum value of an offence against the sine condition of the objective optical system (2).

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