Abstract:
PROBLEM TO BE SOLVED: To promote the sales of packaged media by continuously providing each user who duly purchased the packaged media with not only the contents stored in the packaged media but also a variety of information services accompanying the media, thus differentiating the users from other users. SOLUTION: A unique ID is added to the packaged media 50. Based on the unique ID and a user ID for identifying the user who purchased the packaged media 50, an authentication server 41 authenticates the user as the authorized user 100 who duly purchased the packaged media 50. Thereafter, the variety of services are provided to the authorized user 100 from an information service server 43 as the authorized user 100 requests so as to differentiate the user from other users. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To adjust a gap with high precision and to constantly stabilize the whole system by enhancing especially the DC gain for a controller even in a near-field area, in a information recording device and method, and an information reproducing device and method to record and reproduce using evanescent light. SOLUTION: When recording using evanescent light is performed, if an emitting means is located in the near field to an information recording surface 2a of an optical disk 2, a laser beam is emitted to the information recording surface 2a as the near-field light. Moreover, a first control section 72 and a second control section 73 to control a SIL 63 to maintain a predetermined distance to the information recording surface 2a, according to the return light quantity of the near-field light emitted to the information recording surface 2a, are connected in parallel. When the return light quantity of the near-field light exceeds a predetermined threshold, the output in the second control section 73 is blocked. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To perform reliable signal recording and signal reproducing by smooth mutual moving by stably supporting an optical head to the recording surface of a spherical optical recording medium. SOLUTION: The spherical optical recording medium 1 has a signal recording surface nearly on the whole of a nearly spherical outer peripheral surface. A supporting shaft 2 is provided at the center axis of this optical recording medium 1. In the state of being disposed at both of the ends of the supporting shaft 2, an optical head moving shaft 3 is fitted. Then, the optical head 4 is fitted to this moving shaft 3 so as to move along this moving shaft 3. Then, moving of the optical head 4 to the signal recording surface of the optical recording medium 1 is performed by a turning movement mechanism which relatively moves the optical recording medium 1 and the moving shaft 3 in a turning direction with the supporting shaft 2 as a center and an optical head moving mechanism which moves the optical head 4 along the moving shaft 3. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To appropriately perform gap control between an optical system and an optical recording medium at a distance where near field light is generated regardless of the driving speed of the optical recording medium. SOLUTION: An electrostatic charge pressure source 1 is connected to a turntable 2 with an optical disk placed thereon, and the electrostatic charge pressure source 1 charges the turntable 2 and the optical disk 3 to have unipolarity. Meanwhile, in an optical head 4, an electrode 9 is provided on an end surface facing the optical disk of an SIL 11 constituting an objective lens part, and control voltage 5 is applied to the electrode 9 to thereby charge electric charge to the SIL end surface facing the optical disk 3. An electric charge amount for charging the electrode 9 is controlled by the control voltage 5 in accordance with a determination value 5 of gap length to thereby perform such gap control so as to keep the gap length 6 constant. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide an optical recording device which is capable of holding the distance between the end face of an SIL and an optical recording medium constant and is capable of preventing the focus from being deviated and also is capable of performing a high-density recording even when scratches and recesses exist on the surface of the optical recording medium and whose manufacturing is also easy. SOLUTION: When such a large disturbance that a returned light quantity 27 after calibration exceeds a thresholds T1, this device uses control by a subcontrol part 37 in combination with control by a main control part 38 in order to restore from the influence of the disturbance. In short, at the point of time when the returned light quantity after calibration exceeds the threshold T1, the device holds the control voltage of the main control part 38 and the device performs the control by the subcontrol part 37 whilst the returned light quantity posterior to calibration exceeds the threshold T1 and performs control so as to suppress the influence due to the disturbance by applying the sum of the hold control voltage of the part 38 and the control voltage of the pat 37 to a piezo element.
Abstract:
PURPOSE: To detect the radial skew by using an optical recording medium forming first and second patterns ranging to plural tracks so as to make reflection light quantities characteristics opposite to each other. CONSTITUTION: When no radial skew exists (radial skew=0), since laser spots 5 are a real circular shape though the laser spots 5 scanning on a present scan track 3B come to both positions of pit patterns A, B, laser beams converge only pits 4B1 .4B2 on the track 3B. Since a signal level RA and the signal level RB of information read in respective positions by the pit patterns A, B are equal to each other, when a difference between both of the signal level RA and the signal level RB is defined a detection level RDS, RDS=0 (RDS≡RA-RB=0), and the absence of the radial skew is detected.
Abstract:
PROBLEM TO BE SOLVED: To prevent the overlapping or crossing of a postscript mark strings with respect to the written recording mark strings at the time of performing postscript writing on non-forming recording layer by a position guide element even if skew or eccentricity changes.SOLUTION: When a postscript of marking is performed with respect to an optical recording medium which is newly mounted and already written, a servo driving signal value is obtained (learned) for one cycle in a state in which the marking already written is subject to tracking servo, obtaining (learning) servo driving signal value for one cycle, the postscript writing is performed by FF control (feed forward control) using a learned value for one cycle obtained, controlling the spot position. By this construction, the spot position can be moved along a track already written even when the eccentricity or the like has been changed due to disc change, thereby making it possible to prevent overlapping or crossing of mark strings. The track offset amount for FF control can be set to have a width larger than one track width. Further, the same function as the conventional two beam self tracking can be achieved while enabling the prevention of the complex structure of device or increase in cost.
Abstract:
PROBLEM TO BE SOLVED: To properly correct displacement of an information recording position caused by axial runout, when first light for recording information and second light for controlling the information recording position are applied via a common objective lens, focus servo control of the objective lens is executed so as to focus the second light on a reflection film formed on an optical disk recording medium, and the information recording position (focal position) based on the first light is set (adjusted) by changing collimation of the first light incident on the objective lens. SOLUTION: An estimated amount of axial runout is acquired for each rotational angle in the circumference of a disk 1, and displacement of an information recording position in a focus direction of first light is corrected based on information regarding the acquired estimated amount of axial runout. Thus, a distance between the information recording layers is reduced to achieve a large recording capacity. Attachment and detachment of the disk are permitted to improve convenience. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To effectively prevent a disk from being damaged caused by lens collision when a near-field beam is used. SOLUTION: A total reflection returned light quantity detected by irradiating a signal recording surface of a rotationally driven optical disk with a laser beam and a near-field beam is differentiated to calculate a movement speed of a lens in an optical pickup. Driving control of the optical pickup or the lens in the optical pickup is performed based on the calculated movement speed. For example, when the calculated movement speed exceeds a predetermined permissible speed, a retreat processing for making the lens apart from the surface of the optical disk is performed. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent a disk and a lens from being damaged due to surface wobbling when a disk large in the surface wobbling, such as a flexible optical disk, is used. SOLUTION: In the state that the disk is not rotated, a processing that an optical pickup is made apart from the surface of the disk to retreat from the surface is performed. In the state that the disk is rotated and driven at a prescribed speed or higher, the optical pickup approaches the surface of the disk and then gap control is started by a gap driving system in the optical pickup to perform recording or playback by irradiation with a laser beam. COPYRIGHT: (C)2010,JPO&INPIT