Method for measuring and regulating the radial and tangential an

Details Method for measuring and regulating the radial and tangential an Method for measuring and regulating the radial and tangential an

1993-04-15

1995-05-02

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4432, 369106, 369116, 369107, 360 75, 360 7702, G11B 700

Patent

active

054126401

ABSTRACT:
With an optical playback device, for example, with a compact disk player, care should be taken to see that the light beam scanning the data radiates as perpendicular as possible onto the disk. However, as a consequence of disk slap or chattering, the radial and the tangential angles alter during every revolution of the disk. As a result of the tolerances in the disk and the device, the optical axis deviates from the perpendicular in many cases. In order to regulate the radial angle .phi.R and the tangential angle .phi.T, under which the light beam strikes the disk, the data signal is demodulated in an amplitude demodulator. The regulating signal UR=C* sin .phi.* cos .alpha. for the radial angle .phi.R and the regulating signal UT=-C* cos .phi.* sin .alpha. for the tangential angle .phi.T are generated from the amplitude C and the phase position .phi. of the demodulated data signal.

REFERENCES:
patent: 4634853 (1987-01-01), Kananaru
patent: 4686663 (1987-08-01), Kuhn
patent: 4780865 (1988-10-01), Yamakawa
patent: 5056075 (1991-10-01), Maruta et al.

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