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AssigneesHitachi-LG Data Storage, Inc., Hitachi Consumer Electronics Co., Ltd.
InventorsShinsuke IZAWA, Manabu Shiozawa
Estimating the term…
The invention provides an optical disc apparatus which prevents that a laser beam whose power is set at a read power level causes erroneous data recording or deletion. The optical disc apparatus includes an emission controller which controls an amount of an electrical current that a current supply portion supplies to a laser diode in order to control a level of emission power at which the laser diode emits the laser beam. The emission controller has a function to set levels of the emission power at the following transition processings: a transition processing after a read processing and before a write processing, a transition processing after a write processing and before a read processing, a transition processing between two read processings for respective areas, and a transition processing between two write processings for respective areas.
An optical disc apparatus which reads information from an optical disc using a laser beam, the apparatus comprising:
An optical disc on and from which data can be written and read by irradiation with a laser beam, the disc comprising:
Dependencies are inferred from the claim text.