Information reproducing apparatus and information reproducing method
OwnerKoji Maruyamainventor
Life of this patent
Estimating the term…
Abstract
According to one embodiment, an information reproducing apparatus and method which is able to determine the type of and the standard for a disc on the basis of predetermined priorities, includes an optical head including a light source unit which outputs either first laser light or second laser light having a wavelength different from that of the first light, and a notice processing section which outputs display information indicating that the disc is compatible with the wavelength of the first laser light when the tracking error signal exceeds the predetermined threshold and which outputs display information indicating that the disc is compatible with the wavelength of the second laser light when the tracking error signal does not exceed the predetermined threshold.
Claims10
An information reproducing apparatus comprising:
- an optical system including at least a first laser light source and a second laser light source which have different wavelengths and an objective lens which irradiates an optical disc with laser light from the first light source or second light source, the optical system guiding reflected light from the optical disc to a photo detector circuit;
- an optical head including a focus actuator which adjusts a position of the objective lens in a direction of an optical axis for focus control (in order to control a focus of the objective lens);
- a focus error signal threshold determining section which determines whether or not a focus error signal output by the photo detector circuit exceeds a predetermined threshold while the first light source is in use;
- a tracking error signal threshold determining section which, when the focus error signal exceeds the predetermined threshold, determines whether or not a tracking error signal output by the photo detector circuit exceeds a predetermined threshold;
- and
- a notice processing section which outputs display information indicating that the disc is compatible with the first light source when the tracking error signal exceeds the predetermined threshold and which outputs display information indicating that the disc is compatible with the second light source when the tracking error signal does not exceed the predetermined threshold.
An information reproducing method using an information reproducing apparatus having an optical system including at least a first laser light source and a second laser light source which have different wavelengths and an objective lens which irradiates an optical disc with laser light from the first light source or second light source, the optical system guiding reflected light from the optical disc to a photo detector circuit, an optical head device including a focus actuator which adjusts the objective lens in a direction of an optical axis for focus control, an information processing section which processes information output by the optical head device, and a control section which uses information output by the optical head device, the method comprising:
- determining whether or not a focus error signal output by the photo detector circuit exceeds a predetermined threshold while the first light source is in use, when the focus error signal exceeds the predetermined threshold, determining whether or not a tracking error signal output by the photo detector circuit exceeds a predetermined threshold;
- and
- outputting display information indicating that the disc is compatible with the first light source when the tracking error signal exceeds the predetermined threshold and outputting display information indicating that the disc is compatible with the second light source when the tracking error signal does not exceed the predetermined threshold.
Dependencies are inferred from the claim text.