Apparatus for optical pick-up

Details Apparatus for optical pick-up Apparatus for optical pick-up

2007-04-13

2011-10-25

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112030, C369S112120

Reexamination Certificate

active

08045427

ABSTRACT:
An optical pickup includes a light source configured to emit light, a beam splitter configured to transmit or reflect light, an object lens configured to condense the light transmitted by the beam splitter onto an optical storage, and a diffraction grating having a first grating pattern and a second grating pattern. The first grating pattern is configured to diffract and divide the light reflected by the optical storage into a main beam and two sub beams. The second grating pattern is configured to diffract the light along a different diffracting direction than the first grating pattern. A condensing lens is configured to generate astigmatism to the light diffracted by the first grating pattern, and a light sensor is configured to receive the light via the condensing lens and detect a tracking error signal.

REFERENCES:
patent: 5446565 (1995-08-01), Komma et al.
patent: 6108283 (2000-08-01), Fujita et al.
patent: 7064898 (2006-06-01), Takasuka et al.
patent: 2002/0075775 (2002-06-01), Katayama
patent: 2002/0126588 (2002-09-01), Katayama
patent: 2007/0189130 (2007-08-01), Anzai et al.
patent: WO 2006027955 (2006-03-01), None

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