Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2002-04-29
2003-02-25
Faber, Alan T. (Department: 2651)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C360S069000, C360S073030, C369S053200, C369S053370, C369S190000, C369S239000, C369S275100, C369S044290
Reexamination Certificate
active
06526005
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a disc-like record carrier having a predefined diameter on which record carrier control information is recorded.
The invention likewise relates to an information recording and/or reading apparatus comprising a drive means for rotatingly driving a disc-like record carrier, and setting means for setting the apparatus in dependence on control information carried by the record carrier, and which apparatus comprises components whose behaviour depends on the diameter of the record carrier.
BACKGROUND AND SUMMARY OF THE INVENTION
A record carrier and apparatus of the type set out in the opening paragraph are known, for example, from EP-A 0.325.329.
In said document an apparatus is described for recording and reading information in an optical record carrier of a writable type. During recording and/or reading, the speed of rotation of the record carrier is controlled in dependence on a measuring signal that is indicative of the linear scanning velocity, at a value at which the linear scanning velocity remains constant. The behaviour of this speed control depends on the diameter of the record carrier. For that matter, the loop gain of the control loop and thus the bandwidth of the control strongly depends on the mass moment of inertia of the disc and thus strongly depends on the diameter of the disc.
It is an object of the invention to provide means which make it possible to utilize record carriers of different diameters, while a detrimental effect of the diameter of the record carrier on the behaviour of the apparatus is counteracted.
According to a first aspect of the invention the record carrier of the type set out in the opening paragraph is characterized in that the control information contains diameter information which is indicative of the diameter.
According to a second aspect of the invention the apparatus of the type set out in the opening paragraph is characterized in that the setting means comprise means for adapting the diameter-dependent behaviour of said components in dependence on the control information.
These measures enable the behaviour of the apparatus to be optimally adapted in a simple manner to the diameter of the record carrier.
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Faber Alan T.
Koninklijke Philips Electronics , N.V.
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