US Patent 7120108 Objective lens and optical pickup device
Patent 7120108 was granted and assigned to Konica on October, 2006 by the United States Patent and Trademark Office.
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An objective lens to converge a light flux having a working reference wavelength λ0 (380 nm≦λ0≦450 nm) under a working reference temperature T0 onto an optical information recording medium equipped with a protective substrate having a thickness of 0.6 mm with almost no aberration. The diffractive structural section of the objective lens has a first compensating function to compensate a change amount δSA1 of the third-order spherical aberration component of wavefront aberration caused by a fluctuation of a working wavelength, a second compensating function to compensate a deviation δWD of a converged-light spot in an optical axis direction caused by a fluctuation of a working wavelength, and a third compensating function to compensate a change amount δSA2 of the third-order spherical aberration component of wavefront aberration caused by a change of a refractive index of the lens body.
US Patent 07120108 Objective lens and optical pickup device US Patent 7120108 Objective lens and optical pickup device
US Patent 07120108 Objective lens and optical pickup device
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