| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369440370 | Plural incident beams | 16 |
| 20080232208 | High Frequency Central Aperture Tracking - The present invention relates to an optical system for performing radial tracking on an associated optical record carrier. The optical system contains at least one radiation-emitting device capable of emitting at least three beams: a first beam for reading and/or recording information, and at least a second beam and a third beam for tracking. The optical system is adapted for radial tracking of the first spot from a tracking error signal generated based on the high-frequency component of the central-aperture signal of the second and third beams. The tracking error signal may be generated based on a difference signal of a DC-level of the power of the high-frequency components of the central-aperture signal. | 09-25-2008 |
| 20080279060 | OBJECTIVE LENS DEVICE, OPTICAL PICKUP DEVICE, OPTICAL-DISC DRIVING DEVICE AND DRIVING METHOD OF OBJECTIVE LENS - An objective lens device includes: a first objective lens having a first numerical aperture, which can condense light into a disc-shaped first optical recording medium including a first cover layer of first thickness; a second objective lens having a second numerical aperture which is smaller than the first numerical aperture, which can condense light into a disc-shaped second optical recording medium including a second cover layer of second thickness which is thicker than the first thickness; a third objective lens having a third numerical aperture which is smaller than the second numerical aperture, which can condense light into a disc-shaped third optical recording medium including a third cover layer of third thickness which is thicker than the second thickness; and a lens holder configured to integrally hold the first, second, and third objective lenses. | 11-13-2008 |
| 20080279061 | Method for Recording and Reproducing a Hologram and Apparatus Therefor - A hologram recording method is a method of recording a hologram, on a hologram recording apparatus that records information by forming a diffraction grating through oppositely irradiating the signal beam and the reference beam to the hologram record carrier. The hologram recording method includes a step of focusing the reference beam at a first numerical aperture from a first effective diameter by means of the reference-beam objective lens, a step of separating the reference beam in a part on the optical axis and a neighborhood thereof to thereby produce from the reference beam a recording reference beam to passes through the hologram record carrier at a second numerical aperture smaller than the first numerical aperture from a second effective diameter smaller than the first effective diameter by means of the reference-beam objective lens of the reference-beam optical system, and allowing the recording reference beam to exit coaxially to the reference beam, and a step of not allowing only the recording reference beam to exit toward the hologram record carrier by means of the signal-beam optical system. | 11-13-2008 |
| 20100074070 | CONFIGURABLE PHOTO DETECTOR CIRCUIT - A configurable photo detector circuit comprises a photo detector array including a plurality of photo detectors coupled to a plurality of amplifiers. A method for programming a detection pattern of the configurable photo detector circuit comprises selecting a first detection pattern for the photo detector array, generating first signals to create the first selected detection pattern, and applying the first generated signals to the photo detector circuit to implement the first selected detection pattern. | 03-25-2010 |
| 20100322047 | OPTICAL PICKUP AND OPTICAL DISC APPARATUS - When recording/reproducing an optical disc having a recording layer of multi-layer structure, an unwanted optical beam reflected from a recording layer other than a target layer for recording/reproduction is incident on a photodetector to cause an unwanted disturbance component to leak to a detection signal, giving rise to a degradation in the quality of a tracking control signal. In an optical pickup apparatus, for suppression of the degradation, an optical element is mounted having a diffraction area for diffracting part of the optical beam and light receiving planes for sub-optical beams are provided each of which has a light shielding zone or dead zone of a predetermined width on its central sectioning line. | 12-23-2010 |
| 20110170388 | OPTICAL DRIVE DEVICE AND FOCUS SERVO CONTROL METHOD - An optical drive device includes first and second light sources, an objective lens configured to receive a first light emitted from the first light source and a second light emitted from the second light source and to irradiate both the first light and the second light to an optical disc recording medium, a first focus mechanism configured to drive the objective lens in a focus direction, a second focus mechanism configured to change collimation of the second light incident to the objective lens and changing the focusing position of the second light independently of the first light, a first focus servo control unit configured to drive the first focus mechanism, an error signal subtraction unit configured to subtract the first focus error signal from a second focus error signal, and a second focus servo control unit configured to drive the second focus mechanism. | 07-14-2011 |
| 20110228656 | METHOD AND APPARATUS FOR RECORDING INTERFERENCE FRINGE PATTERN - In order to record an interference fringe pattern in a recording layer of a medium, a plurality of laser beams are caused to interfere so as to form interference fringes in the recording layer; and during a time period over which the plurality of laser beams are caused to interfere, the following steps are continuously performed: (1) producing a signal varying according to a shift of a specific position in the recording layer; and (2) shifting a fringe-forming position in the recording layer by changing a phase of at least one of the laser beams or moving the recording layer based upon the signal produced in the step (1). | 09-22-2011 |
| 20110235485 | OPTICAL INFORMATION REPRODUCING DEVICE, OPTICAL INFORMATION RECORDING DEVICE, AND METHOD FOR RECORDING OPTICAL INFORMATION - Multi-level recording is quite effective for attaining a larger capacity and a higher transfer rate in the case of an optical disk; however, with conventional technologies, a SIGNAL-TO-NOISE RATIO of a signal deteriorates along with an increase in a multi-level degree, creating a factor for limitations to the multi-level degree. In order to solve problems, when optical information is recorded by use of a standing wave occurring due to interference between two light beams, at least one of the two light beams is modulated in multi-stages. Further, at the time of regeneration, a regeneration reference beam is caused to interfere with respective polarization components of a regeneration beam, the polarization components being orthogonal to each other, thereby concurrently generating not less than three interference beams differing in interference phase from each other before being detected. | 09-29-2011 |
| 20120063281 | SEMICONDUCTOR LASER DEVICE, OPTICAL PICKUP APPARATUS, AND METHOD OF MANUFACTURING SEMICONDUCTOR LASER DEVICE - In a diffractive element, its grating pattern is so configured that a diffraction angle of a diffracted light beam of a light source that is subject to the first-order diffraction in a diffraction area is matched with an angle of a light beam passing through the diffractive area emitted from a light source and a light source position is matched with a light originating point of the light source that emits a light beam to be transmitted, and the center of light intensity distribution is matched with that of the light source passing through the diffractive element by inclining an optical axis of the light source. A position of the diffractive element is adjusted based on an electric current value generated when a reflected return path light beam of the light source is diffracted by the diffractive element and enters the light source. | 03-15-2012 |
| 20130058199 | APPARATUS COMPRISING A PICKUP PROVIDING MULTIPLE BEAMS - The apparatus includes a pickup for reading data from a super-resolution optical disc, the pickup comprising a laser for generating a main beam, a first and a second satellite beam, the two satellite beams each having a radial offset with regard to the main beam, a third satellite beam following the first satellite beam, having the same radial offset as the first satellite beam, and a fourth satellite beam following the second satellite beam, having the same radial offset as the second satellite beam, for providing a crosstalk correction of the HF data signal. The track pitch between adjacent tracks of the optical disc is particularly below the diffraction limit of the pickup, and the light intensity of each of the first and second satellite beams and of the main beam is sufficient to provide a super-resolution effect on the optical disc and the light intensity of each of the third and fourth satellite beams is not sufficient to provide the super-resolution effect. The track pitch between adjacent tracks of the optical disc is advantageously below the diffraction limit of the pickup. | 03-07-2013 |
| 20130100788 | OPTICAL DISK PLAYBACK DEVICE WITH THREE-DIMENSIONAL PLAYBACK FUNCTIONALITY - An optical disk playback device comprises one or more lasers, an optical assembly, an optical detector, and controller circuitry coupled to the optical detector. The optical assembly is configured to direct incident light from the one or more lasers so as to form first and second scanning spots on a surface of an optical disk, and is further configured to direct corresponding reflected light from the first and second scanning spots on the surface of the optical disk to the optical detector. The optical detector is configured to process the reflected light from the first and second scanning spots to generate respective first and second data streams, and the controller circuitry is configured to generate a three-dimensional image signal from the first and second data streams. | 04-25-2013 |
| 20140036649 | System and Method for Off-Track Write Prevention and Data Recovery in Multiple Head Optical Tape Drives - In an optical tape drive having optical heads for writing data in tracks on an optical tape, each track having an off-track threshold, a system and method are disclosed for off-track write prevention. The system includes multiple actuators, each actuator configured to control a position of an associated optical heads. The system also includes a controller configured to determine a position of each of the optical heads relative to an associated track on the optical tape and to prevent, in response to an event causing an optical heads to have a position outside the off-track threshold of the associated track, only that optical head from writing data to the optical tape and to buffer a stream of data for that optical head for later processing. | 02-06-2014 |
| 20140078875 | OPTICAL DISK DEVICE - There is a problem that when the relative angle between laser light and an optical disc is changed by temperature, or a chucking state of an optical disc and so forth, the formerly recorded data is overwritten. The above-mentioned problem is solved by performing focus control and tracking control independently with respect to a servo layer and a recording layer in a grooveless disc. | 03-20-2014 |
| 20140169147 | OPTICAL RECORDING AND READING METHOD, OPTICAL RECORDING AND READING APPARATUS, OPTICAL RECORDING MEDIUM, AND METHOD FOR PRODUCING AN OPTICAL RECORDING MEDIUM - An optical recording medium includes a recording and reading layer that is previously staked or formed afterword and has no concavo-convex pattern for tracking control, and a servo layer in which a concavo-convex pattern or a groove for tracking control is formed. Information can be recorded in the recording and reading layer while tracking is performed using the servo layer. | 06-19-2014 |
| 20160042758 | METHOD FOR DETERMINING PHASE DIFFERENCE OF TRACKING ERROR SIGNAL - A method for determining phase difference of tracking error (TE) signal is disclosed. The method includes following steps. An optical disc drive is activated to generate a TE signal. Amplitudes of the master push pull (MPP) signal, the secondary push pull (SPP) signal and the TE signal are measured. The phase difference between the MPP signal and the SPP signal of the TE signal is quickly calculated according to the law of cosine. | 02-11-2016 |
| 369440380 | Recording | 1 |
| 20090003153 | OPTICAL INFORMATION RECORDING DEVICE, OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION REPRODUCTION DEVICE AND OPTICAL INFORMATION REPRODUCTION METHOD - An optical information recording device includes: a section that acquires recording information that should be recorded on an optical information recording medium on which information are recorded by forming a recording mark at a position where an optical beam is focused on and from which the information are reproduced based on the reflectance of the recording mark; a section including at least one or more one-surface beam emission sections that emit a recording beam according to part of the recording information to one surface of the recording medium and focus the beam on a target position to form the recording mark; and an section including at least one or more other-surface beam emission sections that emit an recording beam according to the rest of the recording information to the other surface of the recording medium and focus the beam on a target position to form the recording mark. | 01-01-2009 |
