Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Reexamination Certificate
2011-03-29
2011-03-29
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
Reexamination Certificate
active
07916418
ABSTRACT:
Method and apparatus for controlling the rotation velocity of an optical disc in a wide range of velocities, including low velocities. In a first range of velocities, a first sensor, for example an EMF sensor, is used to control the commutation moments of a turntable motor. For velocities outside the first range, a periodic control signal based on a periodic second signal generated by a second sensor and a mapping between the first and second periodic signal are used. The method and the apparatus are suitable for LightScribe™ applications.
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ISR/Written Opinion of the International Searching Authority PCT/IB2006/051560.
Hoogzaad Gian
Van Bijnen Joop
Koninklijke Philips Electronics , N.V.
Tzeng Fred
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