Importance

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Abstract

An optical head device may include an objective lens drive device for driving an objective lens, an optical path defining optical system which defines an optical path directing to the objective lens from the light source and an optical path directing to a light receiving element from the objective lens, a device frame which holds the objective lens drive device on an upper face side of the device frame and on which the optical path defining optical system is mounted, an aberration compensating element which is mounted on the upper face of the device frame and disposed between the optical path defining optical system and the objective lens for compensating aberration of the laser beam that is converged on the optical recording disk, and a wavelength plate which is disposed between the optical path defining optical system and the objective lens for converting a polarization direction of the laser beam emitted from the optical path defining optical system.

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First Claim