Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-01-10
1997-05-20
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 54, G11B 700
Patent
active
056318928
ABSTRACT:
An optical writing and/or reading device. A radiation source (10) generates a radiation beam (11). This radiation beam (11) is directed by an optical system onto a servotrack (4) of a rotating record carrier (1). The beam reflected via the record carrier is passed on to a push-pull detector (12). The servotrack has a periodical radial wobble whose frequency is modulated in accordance with a position-information signal. A signal-regaining circuit (17) regains the position-information signal from the push-pull signal. A balancing circuit (41, 42; 50, 51) adjusts a weighting the ratio between the detection signals which contribute to the difference signal. The DC component in the adapted push-pull signal is derived by means of a low-pass filter (44). In dependence upon the determined DC component, a circuit (45) sets the weighting ratio to a value at which the determined DC component is substantially zero.
REFERENCES:
patent: 4471477 (1984-09-01), Bierhoff
patent: 4999825 (1991-03-01), Raaymakers et al.
patent: 5023856 (1991-06-01), Raaymakers
Epps Georgia Y.
Huber P. W.
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