Abstract: An optical disk and an optical disk reproduction device for reproducing the same are provided. The optical disk including at least one layer comprises an information storage area for storing information on the optical disk and a data area for storing data, wherein the information storage area stores information on the amount of reflection and thickness of each of a plurality of layers, and transmission speed information on a plurality of areas which constitute the data area.

Abstract: An optical disk and an optical disk reproduction device for reproducing the same are provided. The optical disk including at least one layer comprises an information storage area for storing information on the optical disk and a data area for storing data, wherein the information storage area stores information on the amount of reflection and thickness of each of a plurality of layers, and transmission speed information on a plurality of areas which constitute the data area.

Abstract: An optical pickup apparatus which includes a light transmitting system is provided. A light source system provides the light transmitting system with light; a light receiving system includes detectors which are configured to detect light reflected from the multilayer optical disk; and a stray light controller is configured to prevent stray light from reaching the detectors. The stray light controller is disposed between the light source system and the light receiving system. The stray light controller includes a light transmitting portion through which light reflected from the multilayer optical disk and the stray light are configured to pass; a light diffraction portion is configured to diffract the light reflected from the multilayer optical disk and the stray light; and a light blocking portion configured to block the light reflected from the multilayer optical disk and the stray light.

Abstract: An optical disc apparatus and a focusing method for the same prevent a focusing start error of an optical pickup when using a ring-shaped lens to handle multiple wavelengths, and allow the optical pickup to start focusing at the correct starting time. To write and/or read data to and/or from an optical disc, an optical pickup in the optical disc apparatus emits a laser beam to the disc through an objective lens, and reads a reflected beam to output a read signal. The optical pickup outputs a signal based on the read reflected beam. An actuator controls the position of the objective lens so that the laser beam is focused on a surface of the disc. A focusing controller performs focusing operations on the actuator using a focus error signal generated from the signal outputted from the optical pickup. A focusing start time detector processes the read signal used to generate the focus error signal and detects when to start the focusing control of the focusing controller.

Abstract: An optical disc apparatus and a focusing method for the same prevent a focusing start error of an optical pickup when using a ring-shaped lens to handle multiple wavelengths, and allow the optical pickup to start focusing at the correct starting time. To write and/or read data to and/or from an optical disc, an optical pickup in the optical disc apparatus emits a laser beam to the disc through an objective lens, and reads a reflected beam to output a read signal. The optical pickup outputs a signal based on the read reflected beam. An actuator controls the position of the objective lens so that the laser beam is focused on a surface of the disc. A focusing controller performs focusing operations on the actuator using a focus error signal generated from the signal outputted from the optical pickup. A focusing start time detector processes the read signal used to generate the focus error signal and detects when to start the focusing control of the focusing controller.

Abstract: A circuit and a method of detecting a mirror signal for an optical disc apparatus, the method includes detecting a bottom envelope from a radio frequency signal and providing a bottom envelope signal thereof, amplifying the bottom envelope signal according to a center level of the bottom envelope signal, and comparing the amplified bottom envelope signal with a predetermined comparison voltage to detect the mirror signal.

Abstract: An optical reproducing apparatus and method, with an automatic gain control therefor. The optical reproducing apparatus may include an optical pickup reading out data from an optical disk, an automatic gain controller operating in one of a first amplification mode and a second amplification mode, and a main controller controlling an amplification mode of the automatic gain controller according to the location of the optical pickup. In the first amplification mode, the automatic gain controller amplifies a gain of a RF signal read out by the optical pickup at a fixed amplification rate for a recoding area of the optical disk, and in the second amplification mode, the automatic gain controller adjusts adaptively an amplification rate according to an input level of the RF signal for a non-recording area of the optical disk.

Abstract: A circuit and a method of detecting a mirror signal for an optical disc apparatus, the method includes detecting a bottom envelope from a radio frequency signal and providing a bottom envelope signal thereof, amplifying the bottom envelope signal according to a center level of the bottom envelope signal, and comparing the amplified bottom envelope signal with a predetermined comparison voltage to detect the mirror signal.