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| Number | Title | Issue Date |
| 8045428 | Optical pickup apparatus An optical pickup apparatus comprising: an objective lens focusing laser light emitted from a laser diode to a signal recording layer of an optical disc; a photodetector including a substantially square light-receiving region made of first to fourth sensors divided ... | 10/25/2011 |
| 7420897 | Optical head, an optical disk device and an integrated circuit A light sensing area of a light sensing element is comprised of A1 region, A2 region, B1 region, B2 region and N region. A tilt detector carries out a tilt detection in accordance with a first difference signal, which is a difference sign... | 09/02/2008 |
| 7321113 | Precision material-handling robot employing high-resolution, compact absolute encoder An absolute encoder employs multiple sub-encoders of different resolutions and a linking algorithm for combining the sub-encoder outputs to form an accurate, high-resolution position estimate. The sub-encoders can utilize edge modulation of a main grating track, slo... | 01/22/2008 |
| 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 |
| 7313079 | Method and apparatus for header detection and protection A method of using an RF-sum signal and a plurality of detection signals to determine a property of at least one header and selecting one of a plurality of carrier regions is disclosed. The RF-sum signal and the plurality of detection signals are produced according t... | 12/25/2007 |
| 7304919 | Optical information reproducing apparatus having a servo control circuit In a CLV(constant linear velocity) or MCLV(substantially constant linear velocity)-type optical disk apparatus, instability of servo at inner and outer circumferences of an optical disk is prevented by adjusting a servo-loop gain of tracking servo control or focus s... | 12/04/2007 |
| 7292515 | Multi-layer information storage system with focus and radial positioning error detection An optical information storage system has a multi-recording-layer record carrier and a scanner device for the carrier. The scanner produces a radiation beam which is compensated for spherical aberration for a single height of the scanning spot with the stack of laye... | 11/06/2007 |
| 7292519 | Optical head with lasers and mirrors in a recess formed in a substrate An integrated optical head records and reproduces information to and from optical discs of different types, including CD and DVD, with use of a single information recording/reproducing apparatus. The optical head has a plurality of semiconductor lasers of different ... | 11/06/2007 |
| 7283435 | Optical disc device An optical disc device of the present invention includes spherical aberration changing means for changing spherical aberration occurring on a converging position of a light beam converged by a lens, an actuator for moving the spherical aberration changing means in a... | 10/16/2007 |
| 7280457 | Optical disc with an improved compound lens The present invention relates to an optical pickup and a disc drive for preventing aberrations of laser light due to variations in temperature and humidity to ensure satisfactory characteristics of the laser light. A compound lens (14) is disposed in the opti... | 10/09/2007 |
| 7274633 | Optical pickup An optical pickup in which a plate 2 provided with a photodiode 22 is bonded to an optical bench 1 through an adhesive agent layer 3 in a state in which a minute gap α is maintained between the plate 2 and the optical bench 1 | 09/25/2007 |
| 7253395 | Absolute encoder employing concatenated, multi-bit, interpolated sub-encoders An absolute encoder employs multiple sub-encoders of different resolutions and a linking algorithm for combining the sub-encoder outputs to form an accurate, high-resolution position estimate. The sub-encoders can utilize edge modulation of a main grating track, slo... | 08/07/2007 |
| 7215607 | Optical disc apparatus, control device and control signal generation circuit The optical disc apparatus comprises a convergence lens 12, a light detection device 14 for outputting a first and a second detection signals after detecting reflected optical beam area by area, an actuator 13 for shifting the convergence lens | 05/08/2007 |
| 7193204 | Multi-track optical encoder employing beam divider An optical encoder includes a sensor head, an encoder scale, and an optical wavefront dividing element. The sensor head includes a substrate, a light source, a first optical detector, and a second optical detector. The light source, the first optical detector, and t... | 03/20/2007 |
| 7164624 | Optical scanning device An optical scanning device (1) for scanning an information layer (2) includes a radiation source (6) for supplying a radiation beam (14), a lens system (7) having an optical axis (OO′), and a detection system 8) including:... | 01/16/2007 |
| 7149176 | High-density optical disc A compact high-density optical disc capable of securing recording/reproducing characteristics and high-density recording capacity. The high-density optical disc has a whole diameter of 80 mm or less to 28 mm, a whole thickness in a range of 0.3–0.7 mm, and a posit... | 12/12/2006 |
| 7142489 | Optical disk device with photodetector An optical disk device is provided that can realize favorable recording/reproduction of signals on/from an optical disk having a plurality of signal planes arranged in proximity to each other. In this optical disk device, a hologram (4) is divided into n(n≧... | 11/28/2006 |
| 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 |
| 7095767 | Near field optical apparatus A near field optical apparatus comprising a conductive sheet or plane having an aperture therein, with the conductive plane including at least one protrusion which extends into the aperture. The location, structure and configuration of the protrusion or protrusions ... | 08/22/2006 |
| 7069569 | Near-field optical head system with integrated slider and laser A near-field optical system having one or more solid state lasers and an aerodynamically shaped slider which comprise a single integrated, monolithic device fabricated from the same base semiconductor material. The monolithic optical head can be quickly and easily a... | 06/27/2006 |
| 7068572 | Optical head and optical disk apparatus To stably carry out recording and reproducing to and from a high density optical disk without using a double servo in the optical disk using a high NA objective lens. A detection of a spherical aberration and a detection of a coma aberration in a radial direction ar... | 06/27/2006 |
| 7046594 | Apparatus and method for optical storage system focus control A method of adjusting the focus control for an optical storage system where light is reflected from a surface towards a lens. The method includes receiving a reflected light in the form of a spot, dividing the spot into a plurality of areas, generating an adjustment... | 05/16/2006 |
| 7016274 | Optical pickup system with light receiving portion An optical pickup comprises a light source, a three-way split light diffracting section for dividing light emitted from a light source into one main beam and two subbeams, a hologram for dividing each of the main beam and the subbeams reflected from a recording medi... | 03/21/2006 |
| RE39013 | Method and apparatus for optical recording and reproducing with tracking servo reducing track offset Disclosed is an optical recording and reproducing apparatus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an... | 03/14/2006 |
| 7002137 | Reference point talbot encoder The disclosed optical encoder includes a scale and a sensor head. The scale includes an optical grating and an optical element. The sensor head includes a light source, a detector array, and an index detector all of which are disposed on a substrate. The scale is di... | 02/21/2006 |
| 6967908 | Optical pickup device with focus error detecting optical element and method for focus error detection An optical pickup device for focusing a light beam includes a focus error detecting optical element which splits and leads return light to a photodetector. The focus error detecting element has an area quadrisected by two division lines defining a plane substantiall... | 11/22/2005 |
| 6963530 | Near-field optical head system with integrated slider and laser A near-field optical apparatus having one or more solid state lasers and an aerodynamically shaped slider which comprise a single integrated, monolithic device fabricated from the same base semiconductor material. The monolithic optical head can be quickly and easil... | 11/08/2005 |
| 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 |
| 6940603 | Optical encoder A surface-emitting laser is disposed on a photodetector disposed in parallel with a scale, so that an optical pattern surface of the scale can be irradiated with a light beam having a desired shape. A major axis of the light beam emitted from the surface-emitting la... | 09/06/2005 |
| 6937637 | Semiconductor laser and associated drive circuit substrate A near-field optical system having one or more solid state lasers and an aerodynamically shaped slider which comprise a single integrated, monolithic device fabricated from the same base semiconductor material. The monolithic optical head can be quickly and easily a... | 08/30/2005 |
| 6928035 | Optical pick-up, optical disk apparatus and information processing apparatus An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of ... | 08/09/2005 |
| 6879557 | Optical recording medium having pits disposed in a matrix layout and apparatus for processing thereof An optical storage medium includes a plurality of tracks and a plurality of information pits arranged in the tracks. The information pits are designed to produce reflection light upon irradiation of light. The information pits are disposed in a matrix layout so that... | 04/12/2005 |
| 6873581 | Semiconductor laser device and optical pickup apparatus The semiconductor laser device includes a signal light diffraction grating, and a light receiving portion having a pair of photodiodes extending as two strips with a parting portion or a zonal gap interposed therebetween and receiving a focus error detecting beam fr... | 03/29/2005 |
| 6807133 | Optical head and optical disk apparatus To stably carry out recording and reproducing to and from a high density optical disk without using a double servo in the optical disk using a high NA objective lens. A detection of a spherical aberration and a detection of a coma aberration in a radial direction ar... | 10/19/2004 |
| 6801491 | Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof A focus error detecting apparatus and a focus error detecting method of an optical pickup in which the system is not easily influenced by track transversal noises and an optical disc thickness error and which can be used together with a 3-beam system or a DPD system... | 10/05/2004 |
| 6801484 | Method for generating header and transition flags using DPD technology and optical device using the same A method for generating header and transition flags using the DPD technology and an optical device using the same are disclosed. The method first sets a first and a second threshold levels. Then, the method generates a phase difference signal, i.e. starting a phase ... | 10/05/2004 |
| 6798723 | Optical pickup head and information recording/reproducing device An optical pickup head is provided with a light source, a diffracting means for creating a plurality of diffracted beams, a converging means for focusing the diffracted beams onto an optical storage medium, a beam branching means for branching the plurality of beams... | 09/28/2004 |
| 6744707 | Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including at least one of a track having a mark or a space selectively arranged, and a... | 06/01/2004 |
| 6741540 | Optical pickup device, information reproduction/recording apparatus, and information processing apparatus The present invention provides an optical pickup device that is resistant to noise in a signal or an RF signal outputted from each light receiving member. Current signals outputted from the light receiving members are converted into voltage signals by I/V converters... | 05/25/2004 |
| 6674695 | Tracking controller for recording track of narrow track pitch A tracking controller capable of conducting a correct tracking control even if a recording track is formed with a narrow track pitch on a recording disk. The tracking controller calculates an error value between a read signal read from a recording track i... | 01/06/2004 |
