Tilt error signal producing apparatus using multiple tracking er

Details Tilt error signal producing apparatus using multiple tracking er Tilt error signal producing apparatus using multiple tracking er

1997-04-07

1998-09-15

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 709

Patent

active

058089853

ABSTRACT:
An apparatus for producing a tilt error signal representative of the tilt of an optical disk is disclosed. The apparatus includes a source of laser light for focusing a laser beam onto the disk and reflecting such beam from the disk, a beamsplitter positioned to receive the reflected light beam and to direct the light beam in a first direction, and a structure for separating the reflected light beam from the beamsplitter into at least four portions and for producing detection signals for each portion. The apparatus further includes circuitry responsive to the detection signals for producing first and second tracking error signals, the first and second tracking error signals being produced by different combinations of the detection signals and both being sensitive to cross-track diffraction, and circuitry responsive to the first and second tracking error signals for producing the tilt error signal.

REFERENCES:
patent: 5065380 (1991-11-01), Yokota
patent: 5206848 (1993-04-01), Kusano et al.
patent: 5302834 (1994-04-01), Murao
patent: 5523989 (1996-06-01), Ishibashi
U.S. application No. 08/742,237, filed Oct. 31, 1996, entitled Multi-Element Prism for Optical Heads by Timothy S. Gardner, David B. Kay and Ronald E. Gerber.
U.S. application No. 08/742,239, filed Oct. 31, 1996, entitled Multi-Element Prism for Optical Heads by Ronald E. Gerber, Timothy S. Gardner and David B. Kay.

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