Quotables
"The production of too many useful things results in too many useless people."
Karl Marx
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7342871 | High density optical disc and method for reproducing and recording data thereof A high-density optical disc such as a high density-digital versatile disc (HD-DVD) or Blu-ray disc, and a method for reproducing or recording data of the high-density optical disc. The high-density optical disc includes a lead-in area, a data area and a lead-out are... | 03/11/2008 |
| 7319644 | Optical head, light-emitting/receiving device, and apparatus for recording/reproducing optical recording/recorded medium An optical head in which focusing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodetec... | 01/15/2008 |
| 7310290 | Tracking learning/adjusting method and optical disk device Even in an optical disk which includes, within a single disk, plural record areas whose track-pitches differ from each other, a tracking parameter is adjusted in a short time and with a high accuracy. At first, an optical pickup for reading information recorded in t... | 12/18/2007 |
| 7233552 | Optical disk device capable of recording information data according to ZCLV format An optical disk device for recording data in an optical disk under ZCLV control is provided. The optical disk device divides the optical disk into a plurality of zones, and drives said optical disk at a linear velocity fixed in each zone but varied among the zones. ... | 06/19/2007 |
| 7095687 | Optical pickup device that corrects the spot shape of reflected light beams An optical head in which focussing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodete... | 08/22/2006 |
| 7046600 | Optical disc apparatus with laser power control matching linear recording velocity A method is designed for controlling a power of a laser beam irradiated onto a track of an optical disc for recording of data at a given linear velocity. The method is carried out by the steps of performing test recording into a predetermined area of the optical dis... | 05/16/2006 |
| 7020058 | Optical disc device varying, detecting and noticing a recording velocity during a recording An optical disc device records data on an optical disc by projecting a laser beam on the optical disc such that a linear density of the data becomes substantially constant. The optical disc device comprises velocity judging means, velocity changing means, recording ... | 03/28/2006 |
| 6952381 | Record carrier including a servo track having first and second modulated parts representing a data type and a word sync type, respectively, and an apparatus for scanning the record carrier A record carrier has a servo track (4) indicating an information track (9) intended for recording information blocks. The servo track (4) has a periodic variation of a physical parameter at a predetermined frequency and modulated parts for encod... | 10/04/2005 |
| 6940789 | Optical pickup device that corrects the spot shape of reflected light beams An optical head in which focussing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodete... | 09/06/2005 |
| 6914862 | Device and method for calibrating linear velocity and track pitch for optical disc drive A device and method for calibrating linear velocity and track pitch for an optical disc is disclosed. The device comprises a frequency divider, a synchronous bit-clock generator, a counter and a linear velocity and track pitch calculator. The frequency divider recei... | 07/05/2005 |
| 6751174 | Disc reproducing system A disc playback system according to this invention, as shown in FIG. 1, comprises a pickup 1 for reading information from an information disc 2 on which data are recorded at a constant linear velocity, a disc motor 16 for rotating the informatio... | 06/15/2004 |
| 6724694 | Disk mastering based on near-field optical systems Structures of storage media for optical storage systems, especially for systems in the near-field configuration to couple radiation between the optical head and the media at least in part by evanescent fields. ... | 04/20/2004 |
| 6704269 | Optical disk recording apparatus In accordance with a length of a pit to be recorded, a laser power irradiation time is controlled to have a length of (n-K)T +Ɗ3T, where nT represents the length of a pit to be formed, K is a constant and Ɗ3T represents an extra laser power value for ad... | 03/09/2004 |
| 5375108 | Optical disk device and method for controlling head movement thereof An optical disk device having a head for reading information from a disk having tracks of different pitches depending upon a radial position on the disk. The device comprises: a unit for detecting the number of track where the head is being located from a... | 12/20/1994 |
| 5239533 | Information recording medium An information recording medium of this invention comprises a plurality of concentric tracks or a spiral track, having a plurality of recording tracks for recording information, and record pits formed on the recording tracks, said record pits being formed... | 08/24/1993 |
| 5023856 | Optically readable record carrier for recording information, apparatus for manufacturing such a record carrier, apparatus for recording information on such a record carrier, and apparatus for reading information recorded on such a record carrier An optical disc record carrier having a radiation-sensitive surface and a spiral or concentric pattern of information tracks thereon. The radial displacement of each track is modulated to produce a periodic radial wobble, the frequency of such periodic di... | 06/11/1991 |
| 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 |
| 4849955 | Moving device for an optical recording system in a high density spiral track-forming apparatus A high density spiral track forming apparatus according to the present invention includes a linear motion mechanism for moving an optical recording system in a radial direction of a disk-shaped substrate, and a length measurement machine for detecting the... | 07/18/1989 |
| 4700335 | Method and apparatus for recording a continuous spiral information track with different track pitches An optical information recording method comprises a first step of scanning a radiation beam on a disk-like recording medium without effecting tracking control, and recording information as concentric circular or spiral information tracks for at least one ... | 10/13/1987 |
| 4648084 | Storage medium track pitch detector Method and apparatus for measuring the spacing between adjacent information tracks on a recording medium. A spot of light is projected onto at least a portion of a first track and maintained in a constant spacing from a second track. A photodetector detec... | 03/03/1987 |
| 4578786 | Track pitch calibration system for use in optical storage devices A system and method for maintaining a prescribed track pitch in an optical storage system wherein a second radiation beam is aligned a desired distance from a first radiation beam, the first radiation beam being controllably steered to follow a previously... | 03/25/1986 |
| 4577301 | Track pitch calibration error reduction A system and method for optically measuring and maintaining track pitch in an optical storage system. A set of at least four calibration tracks, each having a prescribed track pitch or distance therebetween, are precisely placed on a record carrier of the... | 03/18/1986 |
| 4571714 | Read beam position calibration A system and method for optically measuring and maintaining track pitch in an optical storage system. A set of at least four calibration tracks, each having a prescribed track pitch or distance therebetween, are precisely placed on a recording medium of t... | 02/18/1986 |
| 4566091 | Process and device for regenerating the phase of synchronizing signals in a data carrier optical write-read apparatus Process for the regeneration of synchronizing signals used for writing and/or reading recorded digital data or for recording on an optical data carrier, wherein the synchronizing signals are regenerated in phase by determining the phase shift of the cente... | 01/21/1986 |
| 4566090 | Storage medium track pitch detector Method and apparatus for measuring the spacing between adjacent information tracks on a recording medium. A spot of light is projected onto at least a portion of a first track and maintained in a constant spacing from a second track. A photodetector detec... | 01/21/1986 |
| 4538255 | Method of and system for cutting a phonograph record with two-channel modulation A system for controlling the mean depth and spacing of V-grooves cut by a stylus in a phonograph disk for recording stereophonic sounds comprises a processing stage deriving first and second signal components, designed for the vertical and lateral deflect... | 08/27/1985 |
| 4499574 | Record carrier with an optically readable information structure A record carrier is described having an optically readable information structure comprising trackwise arranged information areas which, in the track direction, alternate with intermediate areas, the information being contained in at least the local length... | 02/12/1985 |
| 4351044 | Recording system using disk-shaped recording medium A recording system of the type wherein the information is recorded on a spiral track on a disk-shaped recording medium, which is rotated by a signal transducer which is moved radially with respect to the recording medium. Both the rotational speed or angu... | 09/21/1982 |
| 4348754 | Digital delay for high quality audio use A disk mastering preview system utilizes an original audio signal from an audio source for previewing signals to be recorded by a disk lathe. Delayed audio signals corresponding to the original audio signals are produced for recording by the disk lathe a ... | 09/07/1982 |
| 4157460 | Apparatus for cutting audio disks The disclosure applies to an audio recording apparatus which receives audio signals, generally from a tape recorder, and forms grooves in a spiral pattern on a recording disk. The apparatus typically includes a turntable for rotating the recording disk, a... | 06/05/1979 |
| 3964752 | Methods and devices for recording, engraving and reproducing modulated information in tetraphony A microgroove disk record for monophonic, stereophonic and tetraphonic reproduction of modulated information recorded on four separated tracks one of which corresponds to a left fore channel, another one to a right fore channel, another one to a left rear... | 06/22/1976 |
