Abstract:
PROBLEM TO BE SOLVED: To utilize effectively respective memories, by selecting and recording appropriately a semiconductor memory, a magnetic memory, and an optical memory, when information is recorded. SOLUTION: When information is recorded and blank of a recording region of a semiconductor memory 101 is the prescribed range or more, information is recorded in the semiconductor memory 101; when blank of a recording region of a semiconductor memory 101 is less than the prescribed range and blank of a recording region of a magnetic memory 102 is the prescribed range or more, information is recorded in a magnetic memory 102; when blank of recording regions of a semiconductor memory 101 and the magnetic memory 102 are less than the prescribed range, information is recorded in an optical memory 103; when recorded information is reproduced, the number of times of access is counted, information on the number of times of comparatively many access is moved to the semiconductor memory 101, and information on the number of times of comparatively few accesses is moved to the optical memory 103. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a SIL (solid immersion lens) capable of suppressing damages even when collision occurs with an object irradiated with light such as a data recording medium. SOLUTION: The SIL includes a spherical part, a cone-shaped part 22, and a tip part 23, and a curved surface 2Er is formed in an edge part between the cone-shaped part 22 and the tip part 23. Especially, setting the curved surface 2Er having a relatively large curvature on a relative traveling direction approaching side with a data recording medium reduces stress concentration during collision, thereby preventing or suppressing damaging of the surface of the data recording medium. Stabilization of gap control is improved. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To highly precisely control a gap between a focusing optical system and an optical recording medium when the optical recording medium is irradiated with a near-field light. SOLUTION: A push-pull signal Tpp in a traveling direction relative to the optical recording medium of a total-reflection return light quantity is fed forward to a gap error sinal GES obtained by detecting the total-reflection return light quantity between an optical lens and the optical recording medium. A gap servo signal is thus obtained to perform gap servo, the predetermined amount of a push-pull signal Tpp is stored, and then tilt servo is carried out. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical recording and reproducing device and a method for stably correcting the tilt of an optical recording medium and a near-field light irradiation part, and an optical head. SOLUTION: In the optical disk device, after the tilt of an SIL with respect to an optical disk is corrected, a gap length and a full-reflection return light amount forms a linear relation. Thus, a data processing part switches the target value of a gap servo from a tilt correction gap servo target value to a final gap servo target value, thereby controlling a gap from, e.g., a current gap length of 50 nm to a final target value of 30 nm. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a near-field optical disk device which uses only a single wavelength, namely, uses a laser beam source for gap servo that also serves as a laser beam source for reading and writing, with the optical disk device being capable of keeping gap length always constant, even if an expander for adjusting focus is moved. SOLUTION: The near-field optical disk device is provided with a focus adjusting part 35, adjusting the focus of near-field light with which an optical disk 31 of an optical head 49 is irradiated, in a state where the gap servo is performed by a gap servo part 40; and a gap servo correcting part 42, correcting gap servo by means of the gap servo part 40 for adjusting the focus for the optical disk 31 of near-field light by the focus adjusting part 35. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk drive which can record or reproduce an optical disk recorded in a density higher than before and control the tilt of an objective lens more correctly than before. SOLUTION: This drive has a movable frame 22 carrying an optical pickup 21; support frames 23a, 23b for the movable frame 22; elastic supports 24a, 24b to move the movable frame 22 against the support frames 23a, 23b; magnets 27a, 27b arranged on the movable frame; and a 1st and 2nd electromagnets 28a, 28b, 29a, 29b, 2a, 32b, 33a, and 33b arranged on the support frames 23a, 23b. The movable frame 22 is moved by supplying drive currents to the 1st and 2nd electromagnets 28a, 28b, 29a, 29b, 2a, 32b, 33a, and 33b to produce attraction or repulsion forces between the magnets 27a, 27b. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk integrated type cartridge in which the entering of dust into the cartridge is prevented while a disk is clamped and stable rotation driving is provided, an optical disk rotating device using the cartridge and an optical recording and reproducing device. SOLUTION: In the optical disk integrated type cartridge, first and second supporting bodies 4 and 5 are fixed to and projected from both surfaces of an optical disk 2 along the central axis of the optical disk 2. At least the first supporting body 4 is made of a magnetic body and both tips of the first and the second supporting bodies 4 and 5 are contacted to the inner side of a cartridge 1 in a freely sliding manner through lubricant 6 and 7. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a tilt control method and optical disc apparatus, capable of exerting control so as to eliminate tilt and of carrying out an appropriate gap servo operation. SOLUTION: A light gathering element positioned, facing a disc recordable with a signal and capable of gathering light irradiated from a light source as near-field light at a position where a distance to the disc constitutes a first distance is made to come into contact with the disc (step 2), and tilt is controlled with the light collecting element in contact with the disc (steps 3 to 7). As a result, tilting with respect to the disc is adjusted with the SIL in contact with the disc, tilting can be surely eliminated, and gap servo operation can be carried out in an appropriate manner. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To allow enjoying purchased contents regardless of the kind of packaged media or how they are distributed, and to easily convert the contents into data after purchase, while charging the user accordingly. SOLUTION: A content retainer 4 grants the user 2 the right to use the contents whose acquisition the user 2 requested, and the user 2 pays the price of the right. Thereafter, when the user 2 requests the distribution of the contents that the user has the right to use, the content retainer 4 converts uncompressed contents into a data format designated at the time of the request and distributes the contents to the user 2. Alternatively, if the user 2 desires to obtain the contents off-line, the contents that the user has the right to use are converted to the data format designated at the time of the request and recorded on a designated recording medium 50, which is then delivered to the user 2 by courier or the like. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To realize good recording/reproducing considering surface-wobbling of a disk type optical recording medium. SOLUTION: This device is provided with a storage part 31 storing surface-wobbling quantity of the prescribed radius of a disk type optical recording medium 51, a near field light emitting part 7 converging a light beam emitted from a light source 3 and emitting a light beam converged when it is arranged at a near field for an information recording plane of the disk type optical recording medium 51 as near field light, a first control part 30 generating a control signal by multiplying surface-wobbling quantity read out from the storage part 31 by the prescribed gain and controlling the near field light emitting part 7 so that the near field light emitting part 7 follows to surface-wobbling quantity, and a second control part 40 controlling the near field light emitting part 7 so as to keep the prescribed distance in the near field for the information recording plane based on a linear characteristic of return light quantity of the near field light. COPYRIGHT: (C)2004,JPO&NCIPI