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| Number | Title | Issue Date |
| 7948842 | Random access control method and optical disc driver A random access control method is provided, implemented in an optical disc drive for recording data to an optical disc. In the optical disc drive, a buffer stores a plurality of write commands each associated with a data block bound to a destination address. A proce... | 05/24/2011 |
| 7738329 | Random access control method and optical disc drive A random access control method is provided, implemented in an optical disc drive for recording data to an optical disc. In the optical disc drive, a buffer stores a plurality of write commands each associated with a data block bound to a destination address. A proce... | 06/15/2010 |
| 7352683 | Information storage medium, recording method, reproducing method, and reproducing apparatus An information layer 0 comprises a system lead-in area, data lead-in area, data area, and middle area, an information layer 1 comprises a system lead-out area, data lead-out area, data area, and middle area, an end position of the data area of layer | 04/01/2008 |
| 7339860 | Displacement measurement Laser light is irradiated from a lateral side of an optical disk (2) set in place to a peripheral side face of the optical disk (2), return light from the peripheral side face irradiated with the laser light is detected, and a displacement of the optic... | 03/04/2008 |
| 7194750 | Recording/reproducing apparatus and disk cartridge A disk surface of an optical disk is divided into two regions by a straight line being close to a movement line for an optical pickup to scan and passing in the vicinity of a center of the optical disk. An auxiliary stabilizing member is arranged separately from a m... | 03/20/2007 |
| 7183563 | Irradiation apparatus An apparatus for irradiating surfaces includes an electron beam generator for generating a beam of electrons. The beam of electrons exits the electron beam generator through an exit window. A robotic device moves the beam of electrons over the surfaces to irradiate ... | 02/27/2007 |
| 7006425 | Information recording and/or reproducing method and apparatus for three dimensional optical recording medium Information is recorded/reproduced by focusing a light beam in/from an optical recording medium capable of forming therein marks for information recording in a plurality of three-dimensional directions including an arbitrary directions and at least depth direction. ... | 02/28/2006 |
| 6954411 | Optical disc recording method and optical disc drive Because a series of data is recorded continuously, the recording quality of data recorded in course of recording cannot be evaluated. Accordingly, the laser output cannot be controlled properly and there are a deterioration and dispersion of the recording quality. F... | 10/11/2005 |
| 6766414 | Methods, apparatus and system for caching data The invention relates to caching data in a data processing system including a host computer and a storage subsystem including at least one customer disk and a cache disk. Write transactions are received specifying data to be written to at least one customer disk and... | 07/20/2004 |
| 6522443 | High-resolution writing using beams and lenses rotating at equal or double speed A scan systems include at least one radiation source for directing at least one beam toward a spinning scan device. The scan device reflects these beams as rotating scan beams to track rotating scan lenses without translation between the scan beams and th... | 02/18/2003 |
| 6014096 | Data decoding method and device If there is any portion in channel bit data obtained on converting a signal read out from a recording medium into a bi-level signal which fails to satisfy a condition concerning a minimum run length or a maximum run length of the same symbol, the channel ... | 01/11/2000 |
| 5875155 | Optical disk unit having reduced recording and reproducing errors An optical disk presents unit an object lens from being affected by an external disturbance caused by a reversed moving direction of an optical head when information is recorded or reproduced to or from an optical disk. The last moving direction of an opt... | 02/23/1999 |
| 5841598 | Information recording/reproducing apparatus and data processing method An information recording/reproducing apparatus for recording or reproducing information on or from a recording medium in response to a command sent from a host computer has a cache memory serving as an intermediate memory and temporarily storing informati... | 11/24/1998 |
| 5828629 | Optical recording and/or reproducing apparatus with stupping motor drive frequency which is lower than resonant frequency of transmission system An optical recording and/or reproducing apparatus employing a stepping motor for driving an optical pickup for movement in radial directions of a disk. The frequency of a driving pulse signal for driving the stepping motor is lower than the resonant frequ... | 10/27/1998 |
| 5657168 | Optical system of optical information recording/ reproducing apparatus An optical system of an optical information recording/reproducing apparatus includes a light source for emitting a generally parallel luminous flux. An objective optical system for converging the luminous flux emitted from the light source portion onto a ... | 08/12/1997 |
| 5657171 | Optical system of optical information recording/reproducing apparatus An optical system of an optical information recording/reproducing apparatus including a light source, an objective lens, and a chromatic aberration correcting element is provided and also includes a mechanism for independently actuating the objective lens... | 08/12/1997 |
| 5638221 | Optical system of optical information recording/reproducing apparatus An objective optical system of an optical information recording/reproducing apparatus includes a light source for emitting a generally parallel luminous flux, an objective optical system for converging the luminous flux emitted from the light source porti... | 06/10/1997 |
| 5523994 | Magneto-optical recording/reproducing apparatus with optical pickup device having a multi-layer dielectric film beam splitter An optical pickup device for an information recording and/or reproducing apparatus in which fluctuations in polarization film characteristics due to the variable incident angles of the light beam to the beam splitter may be reduced to prevent C/N characte... | 06/04/1996 |
| 5513121 | Optical head An optical head has a stationary optical system and a movable optical system. The stationary optical system includes a semiconductor laser located in a holding member with an opening, and a beam splitter for guiding light emitted from the light source, to... | 04/30/1996 |
| 5481525 | Pulse train condition/heat shut off condition determination method and apparatus for optical recording, and optical recording method and apparatus This invention relates to an optical recording method and apparatus, in which the intensity of a laser beam to be radiated onto an optical recording medium is raised from an intensity Ppre for maintaining a pre-heat state in which the temperatu... | 01/02/1996 |
| 5479296 | Optical system of optical information recording/reproducing apparatus An optical system of an optical information recording/reproducing apparatus including a light source for emitting a generally parallel luminous flux; an objective optical system for converging the luminous flux emitted from said light source portion a med... | 12/26/1995 |
| 5475663 | Information recording/reproducing apparatus An information recording/reproducing apparatus is provided with a velocity control device for moving a recording and/or reproducing head from a current track to a target track under velocity control. A target velocity for the head is determined and the mo... | 12/12/1995 |
| 5471457 | Methods and devices for recording one or more signals which have been encoded by on error detection and correction algorithm on a record carrier by means of an optimal recording intensity A method and device for recording signals on a record carrier with the aid of a radiation beam (15). The signals are recorded in the form of optically detectable marks in parallel tracks which have a substantially constant track pitch. The recording inten... | 11/28/1995 |
| 5467336 | Magneto-optical recording/reproducing apparatus with optical pickup device having a multi-layer dielectric film beam splitter An optical pickup device for an information recording and/or reproducing apparatus in which fluctuations in polarization film characteristics due to the variable incident angles of the light beam to the beam splitter may be reduced to prevent C/N characte... | 11/14/1995 |
| 5440530 | Integrated magneto-optical having a magnetic head set back from an optical head An integrated magneto-optical read and write head having a magnetic head set back from an optical head. The integrated magneto-optical head includes an optical subassembly having optical input for receiving optical radiation and an optical output position... | 08/08/1995 |
| 5436871 | Optical random access memory having folded image A compact optical memory in which data is stored in an optical data layer capable of selectively altering light such as by changeable transmissivity, reflectivity, polarization, and/or phase. The data is illuminated by controllable light sources and an ar... | 07/25/1995 |
| 5434841 | Plural-beam optical head A plural beam optical head is constituted by an optical system for imaging a plurality of light beams onto an optical information recording medium, a double-refractive crystal prism and a sensor. The plurality of light beams obtained from the optical info... | 07/18/1995 |
| 5321550 | Optical system of optical information recording/reproducing apparatus An optical system of an optical information recording/reproducing apparatus including a light source for emitting a generally parallel luminous flux; an objective optical system for converging the luminous flux emitted from the light source onto a medium;... | 06/14/1994 |
| 5253241 | Optical recording apparatus for recording auxillary signals used for focus control An optical recording apparatus for automatically compensating for focus offset which cannot be compensated for with a conventional focus servo circuit. A plurality of auxiliary signals differing from one another in the frequency domain is generated, a rot... | 10/12/1993 |
| 5168486 | Recording device for recording a blank disk from an optical disk An original disk having recording control data on a recording surface thereof and a blank disk having an unrecorded surface are coaxially disposed, and provided to be rotated by a spindle motor in opposite directions. A reproducing pickup for reading the ... | 12/01/1992 |
| 5105416 | Optical disc recording/reproducing control An optical disc is divided into a plurality of sectors each of which includes an address section, a flag section and a data section. First sector management data are stored in the flag section, normally in the form of a flag pit. In one aspect of the inve... | 04/14/1992 |
| 5105411 | Apparatus for detecting and correcting focusing and tracking errors A light beam emitted from a semiconductor laser is converged on a recording surface of an optical disk by a lens. The light beam is intensity-modulated and reflected in accordance with information recorded on the optical disk. The light beam is guided to ... | 04/14/1992 |
| 5051975 | Optical recording and/or reproducing apparatus having a temperature adjusting device The present invention relates to an optical recording and/or reproducing apparatus which optically carries out operations of recording and/or reproducing of information on a data carrier, by irradiating a beam from an optical head to the data carrier. In ... | 09/24/1991 |
| 4984901 | Magnetic recording disc having sector reference zone, device for reading same, and magnetooptical memory optoelectronic employing said device A mode of writing on a magnetic recording carrier (DISC) where the information is distributed over a plurality N of tracks, each track being associated with at least one reference zone (ZRPij) including preamble information, absolute address in... | 01/15/1991 |
| 4972397 | Dithering optical data logger A data logger which incorporates a laser diode and focusing optics for logging data pits in optical recording media. The focusing optics may be attached to a spring assembly and caused to oscillate by electromagnetic or mechanical means. As the optical el... | 11/20/1990 |
| 4954702 | Process for detecting a focal point in an optical head A method for detecting a focal point uses an optical system which includes a laser diode light source, a beam-splitter prism having three surfaces with one surface perpendicular to luminous flux emanating from a recording medium and another surface inclin... | 09/04/1990 |
| 4953152 | Mastering machine for making an on-land recording master disk with two beam alignment servo loops A mastering machine for an optical disk provided with a closed loop for controlling the incident angle of at least one of the guide groove forming beam and header forming beam which enter a condenser lens, and thereby controlling to a predetermined level ... | 08/28/1990 |
| 4907216 | Optical record carrier having position indentifying track modulation A system for recording and/or reading an information signal (Vi) on an elongated track (4) of an optically readable record carrier (1). A position-identifying signal (Vp) which is synchronous with a clock signal is recorded on the tr... | 03/06/1990 |
| 4888753 | Information recording medium capable of accurately detecting the recording and reproduction starting positions and an information recording-reproducing method and apparatus therefor In an information recording medium according to the present invention, marks for discriminating between information tracks and a mark indicative of the information concerning spacing from a position at which each of the marks is provided to the recording ... | 12/19/1989 |
| 4885458 | Card-form recording medium and data recording device therefor A plurality of recording tracks are formed on an optical card. A data record starting flag or data record and flag is formed on at least one of both sides of the recording tracks in the track extending direction.... | 12/05/1989 |
