Matches 1 - 33 out of 33
Match Document Document Title
7477590 Optical recording medium having at least two recordable layers  
The present invention relates to an optical recording medium having at least two information carrier layers, on which information can be written by means of a focused light beam. In this case, a...
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...
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...
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...
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...
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...
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...
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...
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...
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 +Δ3T, where nT represents the length of a pit to be formed, K is a...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
3662353 STORING DIGITAL DATA ON A RECORDING DISK WITH THE DATA TIME BASE PROPORTIONAL TO DISK ANGULAR VELOCITY  
A method for inscribing a modulated spiral groove on a memory disk in which a turntable is rotated at a nominally constant rotational velocity and a digital angular encoder is fixed to the shaft of...
3275756 Control system incorporating a series of electric circuits and providing the reading aloud of an information carrying record  
3223789 Automatic control of groove spacing in phonograph records  
3075052 Methods of producing grooved records  
2977424 Arrangement for producing a sound recording  
2963556 Apparatus for sound recording  
2948783 Cutter control means for cutting recording grooves  
2864896 Device for recording sound oscillations in spiral grooves on a plate-shaped carrier  
2847514 Automatic variable pitch control apparatus for disc recorders  
2792454 Storage device  
2792455 Recording apparatus  
Matches 1 - 33 out of 33