| 摘要 |
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"?>|deltaSA<SUB>1</SUB>/deltaU|.|deltaU|+|deltaSA<SUB>2</SUB>/deltaT|.|deltaT|<=0.07 lambdarms<?in-line-formulae description="In-line Formulae" end="tail"?> where lambda represents a wavelength of a light source, deltaSA<SUB>1</SUB>/deltaU represents a change of a spherical aberration for an object-to-image distance change deltaU (|deltaU|<=0.5 mm) and deltaSA<SUB>2</SUB>/deltaT represents a change of spherical aberration for a temperature change deltaT (|deltaT|<=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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