Tilt servo controlling apparatus

Details Tilt servo controlling apparatus Tilt servo controlling apparatus

1998-04-17

1999-03-23

Masih, Karen

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318638, 318640, 318641, 369109, B64C 1702

Patent

active

058864962

ABSTRACT:
A tilt servo controlling apparatus is provided with: an optical pickup for emitting a light beam onto an optical record medium and detecting a reflection light from the optical record medium to thereby output a detection signal; a level detecting device for detecting a level of the detection signal outputted by the optical pickup; a tilt error correcting device for correcting a tilt error due to an aberration, which is generated by a tilt angle between (i) a normal line of a surface of the optical record medium at a position irradiated with the light beam and (ii) an optical axis of the light beam; and a tilt error correction controlling device for outputting a control signal to control a correction amount of the tilt error correcting device, by giving a variation to the control signal on a time base and adjusting the control signal so that the level detected by the level detecting device be optimized with respect to the variation of the control signal.

REFERENCES:
patent: 5302834 (1994-04-01), Murao
patent: 5322993 (1994-06-01), Ohyama
patent: 5751680 (1998-05-01), Ishibashi et al.

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