摘要:
An optical disk apparatus records new information related to the ROM information into RAM at a position linked with the ROM information of an optical information storage medium while continuously regenerating the ROM information of the optical information storage medium. At least the ROM signals are read at n (n > 2) times of the information regeneration velocity V, which is a reference, and stored in a buffer memory for reading, then the stored information is output at a velocity of the information regeneration velocity V. And while the stored information is being output from the buffer memory for reading, the input information is stored in the buffer memory for writing, then the optical head is accessed an address position that is managed so that the time relationship of the output information and the input information link for recording.
摘要:
There is provided an adaptive recording method for recording binary data having marks and spaces by irradiating a light signal onto an optical recording medium and adaptively adjusting the power of the light signal according to the correlativity between the length of a mark currently being recorded and the lengths of leading/trailing spaces, the adaptive recording method including the steps of (a) checking the output characteristics of a light signal generating apparatus for generating the light signal, and (b) controlling the power of the light signal by referring to the power of the light signal corresponding to the correlativity and the output characteristics in recording the data on the optical recording medium. The adaptive recording method allows accurate recording control by updating light output control data with respect to a power setting value according to variation in the output characteristic of the laser diode.
摘要:
Ein magneto-optisches Speichermedium zum mehrfachen Schreiben von Informationen bei einer Schreibtemperatur T w oder zwei Schreibtemperaturen T h , T l oberhalb der Raumtemperatur T a und zum mehrfachen Lesen bei einer Temperatur T m mit einer Frontmaskierung bei der Temperatur T f und einer Rückmaskierung bei einer Temperatur T r oberhalb der Raumtemperatur T a in einem externen Magnetfeld H e , das ein Substrat, eine auf dem Substrat angeordneten ersten magnetischen Schicht mit einer temperaturabhängigen Koerzitivfeldstärke H C1 (T), der Kompensationstemperatur T cp1 und der Curie-Temperatur T C1 , eine auf der ersten magnetischen Schicht angeordneten zweiten magnetischen Schicht, einer temperaturabhängigen Koerzitivfeldstärke H C2 (T), der Kompensationstemperatur T cp2 und der Curie-Temperatur T C2 , und eine auf der zweiten magnetischen Schicht angeordneten dritten magnetischen Schicht, mit einer temperaturabhängigen Koerzitivfeldstärke H C3 (T), der Kompensationstemperatur T cp3 und der Curie-Temperatur T C3 umfaßt, wobei gilt: T a f m ≤ T cp1 ≤ T cp2 C2 r C1 cp3 C3 ≤ T w und H C1 (T) e für T a m H C2 (T) e für T a m H C3 (T) > H e für T w , zeichnet sich aufgrund eines verbesserten magneto-optischen Effektes durch ein hohes Signal/Rausch-Verhältnis aus.
摘要:
Recording of information is performed by selectively forming a high-temperature level state and a low-temperature level state on a recording medium which is capable of an optical modulation overwrite operation to multi-value power levels on the basis of a multi-pulse recording waveform. A power level PHth of the light beam immediately before the high-temperature level state begins to be formed on the medium is detected and a minimum power level PLmin of the light beam, which can form the low-temperature level state on the medium, is detected. Then, the multi-pulse recording waveform is switched on the basis of the detected power levels PHth and PLmin. Upon recording of a non-overwrite recording medium, a power level Pth of the light beam immediately before recording begins on the medium is detected and a maximum reproduction power level Prmax of the light beam at which information recorded on the medium is not erased is detected. Then, the multi-value recording waveform is switched on the basis of the detected power levels Pth and Prmax.
摘要:
A magneto-optical recording medium includes a substrate on which light is incident, a first magnetic layer provided at the substrate side, and a second magnetic layer provided on the first magnetic layer. The first magnetic layer is an in-plane magnetization film at a room temperature and transits to a perpendicular magnetization film at a temperature between room temperature and a Curie temperature thereof. The second magnetic layer has a Curie temperature lower than that of the first magnetic layer and is a perpendicular magnetization film. A direction of magnetization of the first magnetic layer is anti-parallel to a direction of magnetization of the second magnetic layer in a state in which the first magnetic layer and second magnetic layer are stable each other by exchange-coupling.
摘要:
A materials system in which exchange coupling is achievable has the potential for allowing direct overwriting of data and comprises at least two multilayer films of platinum and cobalt with independently controlled coercivity and Curie temperatures.