Optical device for reading information

Details Optical device for reading information Optical device for reading information

2007-05-22

2007-05-22

Patel, Gautam R. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S100000

Reexamination Certificate

active

10498763

ABSTRACT:
An optical playback or recording device is equipped with mass-unbalance detection means (20) for detecting unbalance on the record carrier (2). Mass-unbalance causes vibration and sound in the optical device when the record carrier (2) is rotated at a relatively high speed. When mass-unbalance is detected, the speed may be reduced to reduce the vibration and sound in the optical device. The mass-unbalance detection means (20) performs the following steps to detect mass-unbalance: a) determining the maximum value Umax1of the actuator control signal (AS) at a rotational speed Ω1; b) determining the maximum value Umax2of the actuator control signal (AS) at a rotational speed Ω2; c) comparing Formula (I) with Formula (II). If these values are substantially equal, then the effect of mass-unbalance is small, otherwise the effect of mass-unbalance is too great and the speed may have to be reducedUmax⁢⁢1ω12⁢⁢with⁢⁢Umax⁢⁢2ω22.(I)

REFERENCES:
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patent: 4628239 (1986-12-01), Everett, Jr.
patent: 5479388 (1995-12-01), Gondou et al.
patent: 5940239 (1999-08-01), Lee et al.
patent: 5970033 (1999-10-01), Nakano et al.
patent: 6671120 (2003-12-01), Koganezawa et al.

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