Method and device for recording a mark having a substantially constant number of pulses per unit length independent of writing speed on an optical information carrier
AssigneeU.S. Philips Corporation
InventorsBernardus A.J. Jacobs, James H. Coombs, Johannes H.M. Spruit, Johan P.W.B. Duchateau, Guofu F. Zhou
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Abstract
A method is described for recording an optical information carrier, in which marks representing recorded data are written at different writing speeds by radiation pulse of equal length and power, independent of the writing speed. The number of pulses per unit length of the written mark is a constant independent of the writing speed.
Claims13
The method of recording marks representing data, comprising irradiating an information layer of an optical information carrier by a pulsed radiation beam at different writing speeds wherein all pulses are of substantially equal pulse width and characterized by each recorded mark, regardless of writing speed, having a substantially constant number of pulses per unit length.
The optical recording device for recording data in the form of marks on an information layer of an information carrier by irradiating the information layer by a radiation beam, the device comprising a radiation source providing the radiation beam and a control unit for controlling the power of the radiation beam according to a varying writing speed such that regardless of writing speed all recorded marks have about the same predetermined number of pulses per unit length with substantially all pulses being of a substantial equal pulse width and having a pulse period based on the varying writing speed.
Dependencies are inferred from the claim text.