Objective optical element, optical pick-up apparatus, and...

Details Objective optical element, optical pick-up apparatus, and... Objective optical element, optical pick-up apparatus, and...

2005-02-15

2005-02-15

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112010, C369S112060

Reexamination Certificate

active

06856471

ABSTRACT:
An objective optical element for use in an optical pickup apparatus, includes an objective lens to converge the light flux emitted from the first and second light sources; and an optical functional surface including a common region and an exclusive region. When a first optical information medium is used, a sine condition unsatisfied-amount whose value is maximum exists on the common region. The following formula is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.5≦COMA2/COMA1≦1.0in-line-formulae description="In-line Formulae" end="tail"?where COMA1 is a coma aberration (λ1 rms) when a light flux goes slantingly to be incident with a view angle of 1° onto the objective optical element when the first optical information medium is used, and COMA2 is a coma aberration (λ2 rms) when a light flux goes slantingly to be incident with a view angle of 1° onto the objective optical element when the second optical information medium is used.

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