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Abstract

An objective lens for converging light emitted from a light source onto an optical recording medium to record and reproduce information consists of a single lens that has at least one aspheric surface. The following conditional expressions (1) and (2) are satisfied:

description='In-line Formulae' end='lead'−0.90<R₁/R₂<−0.45  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.70<d/f<1.40  (2)description='In-line Formulae' end='tail'

where R₁ denotes a radius of curvature (mm) of a light source side surface near an optical axis,

R2 denotes a radius of curvature (mm) of an optical recording medium side surface near the optical axis,d denotes a thickness (mm) on an optical axis, andf denotes a focal length (mm).

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First Claim