Optical head device and method of information reproduction using

Optical: systems and elements – Lens – Including a nonspherical surface

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359823, G02B 302

Patent

active

061081396

ABSTRACT:
An optical head device including a light source for directing a laser beam to an optical disk, a collimator lens arranged between the light source and the optical disk, and an objective lens arranged between the collimator lens and the optical disk, a collimator lens actuator for moving the collimator lens along the optical axis of the laser beam in response to the thickness of the optical disk, and an objective lens actuator for moving the objective lens along the optical axis of the laser beam.

REFERENCES:
patent: 4322838 (1982-03-01), Neumann
patent: 5699341 (1997-12-01), Sugi et al.
patent: 5754513 (1998-05-01), Yagi et al.

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