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US 7,733,758 B2Granted
Objective lens for an optical pickup apparatus
AssigneeKonica Minolta Opto, Inc.
InventorsKohei Ota, Kentarou Nakamura
Life of this patent
Estimating the term…
Abstract
An objective lens for use in an optical pickup apparatus, comprises an objective lens satisfying the following expression: 0.01≦|δSA3obj/δλ|<0.1 (λrms/nm), where δSA3obj/δλ represents the wavelength dependency of the 3rd order spherical aberration of the objective lens when the oscillation wavelength is fluctuated between ±2 nm.
Claims11
An objective lens for use in an optical pickup apparatus, comprising:
- an objective lens satisfying the following expression:
- 0.01≦|δSA3obj/δλ|<0.1(λrms/nm)
- where δSA3obj/δλrepresents the wavelength dependency of the 3rd order spherical aberration of the objective lens when an oscillation wavelength is fluctuated between ±2 nm from a reference wavelength of 500 nm or less.
Dependencies are inferred from the claim text.