Optical pickup device and a method to control an angle...

Details Optical pickup device and a method to control an angle... Optical pickup device and a method to control an angle...

2006-07-11

2006-07-11

Edun, Muhammad (Department: 2656)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112040, C369S112010, C369S044370

Reexamination Certificate

active

07075879

ABSTRACT:
An optical pickup device for a relatively thick disc and/or a relatively thin disk including first and second laser light sources emitting first and second light beams, a first grating splitting the light beams emitted from the second light source, a beam splitter changing optical paths of the light beams emitted from the first and second laser light sources, and an objective lens focusing the light beams passing through the beam splitter onto one of the discs. A photodetector receives and detects the light beams that proceed back after being reflected by one of the discs. A second grating corrects a position of a light spot formed on the photodetector after being reflected by the relatively thin disc or the relatively thick disc, wherein the second grating includes a pattern that is rotated by a predetermined angle with respect to a pattern of the first grating.

REFERENCES:
patent: 6130872 (2000-10-01), Sugiura et al.
patent: 2001/0050933 (2001-12-01), Takahashi et al.
patent: 2002/0027844 (2002-03-01), Furuhata et al.
patent: 2002/0064121 (2002-05-01), Takahashi

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