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US 2006/0187786 A1Published application
Optical information recording and reproducing apparatus
AssigneeCanon Kabushiki Kaisha
InventorShinnosuke Torii
Life of this patent
Estimating the term…
Abstract
It can be determined whether a disc is a single-layer disc or a multilayer disc without causing reproducing deterioration while only a main body of the disc is used without being contained in a cartridge. More specifically, when disc type determination is performed, an intensity of laser light (reproducing light quantity) irradiated to the disc is set to a first light quantity for reproducing information from the disc having a signal recording surface of a single layer.
Claims5
An optical information recording and reproducing apparatus, comprising:
- a light source;
- an objective lens for focusing laser light from the light source on an optical recording medium having a signal recording surface of a single layer or a multilayer to perform information recording or information reproduction;
- a determining circuit for determining number of layers of the signal recording surface of the optical recording medium;
- and
- an adjusting circuit for adjusting an intensity of the laser light irradiated to the optical recording medium,
- wherein when the determining circuit determines the number of layers, the adjusting circuit sets an intensity of the laser light irradiated to the optical recording medium to an intensity for reproducing information from the optical recording medium having a single layer.
3 more elements
Dependencies are inferred from the claim text.