Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk recording device capable of normally terminating search processing for searching a recorded area terminal of a test area even if a searched position corresponds to a damage position in the recorded area.SOLUTION: An optical disk recording device comprises: an optical pickup; a servo control part for servo-controlling the optical pickup; a determination part for writing test data in a test area of an optical disk and determining an optimum recording power value of the optical pickup. When the optical disk is a write-once optical disk, the determination part performs search processing for searching a recorded area terminal of the test area by bifurcation searching. When servo deviation relating to the servo control occurs during the search processing and the servo deviation cannot be recovered, tracing is carried out from a predetermined position of the test area to find the recorded area terminal of the test area (step S130).
Abstract:
PROBLEM TO BE SOLVED: To prevent the exposure power and/or focus state from changing due to changes in the conditions of the substrate surface or optical system devices of an exposure device.SOLUTION: Power control and focus position are controlled by using a light beam reflected by four-divided detector 223c of an astigmatic optical system 223; i.e. a master disk 121. A polarizer is provided to a predetermined position of the optical system to constantly maintain the polarization state of the beam. With this, a high precise power control is achieved. Thus, an exposure device of an optical master disk superior in maintenance performance is achieved.
Abstract:
PROBLEM TO BE SOLVED: To stabilize a servo during recording by suppressing the fluctuation of reflection light quantity from an optical recording medium during a period corresponding to a space.SOLUTION: An optical recording method has: a step for recording information onto an optical disk by irradiating the optical disk with a laser beam of binary or more power including a laser beam of recording power for forming a mark on the optical disk and a laser beam of space power corresponding to a space between marks (S23); a step for reproducing a region of the optical disk recorded before an interruption period and acquiring a reproduction characteristic of the reproduced signal during the interruption period of recording information on the optical disk (S25); and a step for correcting at least the recording power of the binary or more power on the basis of the acquired reproduction characteristic, and controlling the power so as to make the fluctuation of the space power smaller in the case that the recording power is corrected than in the case that a ratio between the recording power and the space power is made constant (S27).
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk recording device capable of suppressing an increase in the number of channels of a transmission line.SOLUTION: The optical disk recording device includes a record pulse information generation part 11 for generating record pulse information corresponding to a power level of a laser beam from a recording signal, a recording code generation part 12 for generating a recording code obtained by coding the record pulse information, a transmission line 2 for transmitting the recording code, and a decoding code generation part 33 for decoding the recording code. The recording code generation part 12 generates the recording code on the basis of a circulation code in which each transition of the power level is expressed by using a Gray code. The decoding code generation part 33 decodes the recording code by using a recording code corresponding to a power level at a specific timing and a recording code corresponding to a power level immediately before the power level at the specific timing.
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk device and a method for controlling the same which can appropriately perform additionally recording without destroying recorded information even when the inclined state of a disk with respect to the optical axis of a light beam has changed from the inclined state thereof in previous recording, in a guide layer separation type optical disk, and can perform a stable erasure operation even in a rewritable disk.SOLUTION: The optical disk device having an optical axis angle variable element which changes an optical axis direction of a first light beam and a second light beam that are emitted from a semiconductor laser to be incident on an objective lens drives the optical axis angle variable element according to the inclination of the optical disk.
Abstract:
PROBLEM TO BE SOLVED: To achieve a super resolution optical information recording medium, which can be identified as the super resolution optical information recording medium by using reproduction laser power for a regular optical information recording medium, and an optical information recording medium reproducing device capable of reproducing both media of the super resolution optical information recording medium and the regular optical information recording medium.SOLUTION: In a super resolution medium 1, medium identification information for specifying a type of a medium is recorded in a medium information area 3 by use of pre-pits having length longer than length of a resolution limit of an optical system in a reproducing device 10.