Entries |
Document | Title | Date |
20080205209 | OPTICAL DISC DEVICE - The invention provides an optical disc device conducting highly accurate skew adjustment, avoiding an increase in the number of components, and achieving downsizing. This optical disc device includes: a guide shaft for supporting an optical pickup and guiding its movement; a chassis the guide shaft is attached to; a coil spring attached to the chassis for applying force to an end of the guide shaft; an adjustment screw for adjusting the force applied by the coil spring, provided opposite the coil spring with respect to the guide shaft; and a weight addition member attached to the chassis, wherein internal threads for engaging with the adjustment screw are formed in the weight addition member, and the axis of the adjustment screw engaged with the internal thread, the center of a cross section of the guide shaft perpendicular to its axis, and the axis of the coil spring are aligned along the same line. | 08-28-2008 |
20080219109 | INFORMATION RECORDING AND RETRIEVAL METHOD, AND ITS APPARATUS - Provided is a recording and retrieval apparatus for a multi-layer optical disk. A multi-layer optical disk in which a plurality of recording layers and a single servo layer are combined to form a set is used. A spot for the servo layer and a spot for the recording layers are turned on in a time-sharing manner. Servo signal detection areas are formed discretely in the servo layer. The servo signal detection areas and data recording areas are provided so as not to overlap each other when viewed from the spot incident side. Thus, separation of data from each of the layers can be done by even a single photodetector without interference. | 09-11-2008 |
20080267020 | OPTICAL DISC APPARATUS AND FOCUS CONTROL METHOD - An optical disk apparatus that performs focus control and tracking control, the focus control focusing an objective lens on an optical disk, and the tracking control making the objective lens track a partial area on the optical disk. The optical disk apparatus has a light-blocking element and a light detector. The light-blocking element is disposed on a first light path on which light reflected by the optical disk travels, and blocks a part of the reflected light. The light detector detects, for the focus control, the reflected light which passes the light-blocking element. The light-blocking element has a predetermined area for blocking the reflected light, the predetermined area extending along a direction optically corresponding to the tracking direction in which the objective lens tracks, for the tracking control, the partial area on the optical disk. | 10-30-2008 |
20080298181 | OPTICAL DISC APPARATUS AND OPTICAL DISC APPARATUS CONTROL METHOD - According to one embodiment, a control method, includes moving a pickup head to an adjustment position adjusting the quantity of adjustment of focus balance measuring the amplitude of an RF signal in the adjustment position adjusting the focus balance adjustment quantity and measuring the RG signal amplitude a plurality of times estimating the focus balance adjustment quantity at which the RF signal amplitude is maximized from the measured focus balance adjustment quantities and RF signal amplitude moving the pickup head to a different adjustment position estimating the focus balance adjustment quantity at which the RF signal amplitude is maximized in the different adjustment position by adjusting the focus balance adjustment quantity and measuring the RF signal amplitude a plurality of times and adjusting the focus balance adjustment quantity to the focus balance adjustment quantity estimated in the different adjustment position. | 12-04-2008 |
20080316877 | Control Method for an Optical Drive with Different Bandwidths - The present invention discloses a method for controlling the position of a radiation beam on an optical carrier ( | 12-25-2008 |
20090003149 | APPARATUS AND METHOD FOR CALIBRATING FOCUS BALANCE IN AN OPTICAL DISK DRIVE - The present invention is to provide an apparatus and method for calibrating focus balance in an optical disk drive. A focus servo unit controls a pick-up head to focus and read a mark for generating an RF signal. A jitter generator separates a jitter signal from the RF signal to form a jitter frequency. A focus balance unit compares sequential jitter frequencies to check the convergence and the goal, and determines the direction and variable of calibrating focus balance to generate an error signal. A compensator receives the error signal through the focus servo unit to control the pick-up head for calibrating focus balance. | 01-01-2009 |
20090003150 | Method for calibrating focus balance of optical disk drive - A method for calibrating focus balance of an optical disk drive includes the steps of: zeroing a reference value; presetting a variable and a direction for calibrating the focus balance; generating a new C1C2 signal according to the preset variable for calibrating the focus balance; determining whether the value of the new C1C2 signal is larger than the value of a previous C1C2 signal or not by way of comparing, and changing the direction if yes or otherwise keeping the direction; and checking whether the value of the new C1C2 signal is larger than a threshold value C1C2 | 01-01-2009 |
20090080297 | FREQUENCY-MODULATED CODING AND DATA RECORDING AND STORAGE USING PLASMONIC NANOSTRUCTURES - A frequency-modulated coding and data recording and storage device that uses plasmonic-dielectric nanostructures of concentric two-layer core-shell design to store data includes a flat transparent substrate having a top surface divided into cells with side dimension d on the order of tens of nanometers and a core-shell plasmonic-dielectric nanostructure disposed in each cell. Each plasmonic nanostructure of concentric core-shell has a predetermined ratio of radii and a predetermined aspect ratio such that when an infrared or visible wavelength signal is applied to each said core-shell plasmonic-dielectric nanostructure a peak scattering amplitude of the applied signal is at different plasmonic resonance frequencies for core-shell plasmonic-dielectric nanostructures with different ratio of radii and different aspect ratios. The sampled values of a signal to be recorded are assigned to each cell and the ratio of radii and/or aspect ratios of the core-shell plasmonic-dielectric nanostructures in the assigned cells are selected to provide a corresponding plasmonic resonant frequency. | 03-26-2009 |
20090129216 | DEVICE AND METHOD FOR USE IN OPTICAL RECORD CARRIER SYSTEMS - A signal-processing device ( | 05-21-2009 |
20090135683 | DRIVE MECHANISM AND OPTICAL HEAD - A drive mechanism according to the present invention includes: a drive body that defines a longitudinal direction; a mover that makes a friction fit with the drive body so as to slide in the longitudinal direction; a base member that supports the drive body so as to allow the drive body to move in the longitudinal direction; a drive element, which is secured to one end of the drive body to vibrate the drive body in the longitudinal direction; and a viscoelastic body, which is arranged between the drive body and the base member in a direction perpendicular to the longitudinal direction. | 05-28-2009 |
20090154306 | OPTIMIZING FOCUS CROSSTALK CANCELLING - A device is arranged for scanning an optical record carrier ( | 06-18-2009 |
20090316537 | RECORDING MEDIUM, OPTICAL DEVICE, AND RECORDING AND REPRODUCING APPARATUS - A recording medium includes at least one recording layer on which information is recorded by multi-photon absorption, and a servo layer disposed in a laminated direction with respect to the recording layer and having a track for guiding a beam spot of laser light having a first wavelength and a beam spot of laser light having a second wavelength along a scanning trajectory. The servo layer and the at least one recording layer constitute a set of layers, and a plurality of sets of layers is formed in the laminated direction. The servo layer is made of a material having a high reflectance with respect to laser light having a third wavelength for generating a servo signal, and low reflectances with respect to the laser light having the first wavelength and the laser light having the second wavelength. | 12-24-2009 |
20100085847 | Optical head device and reading system for multi-layered optical recording medium - A recording and reading system for a multi-layered optical recording medium includes: a multi-layered optical recording medium including a plurality of recording layers and a single servo layer; and an optical head. The optical head includes a recording and reading objective lens of a signal recording and reading optical system and a servo objective lens of a servo signal detection optical system that are disposed on a common actuator. The recording and reading objective lens is mounted on the common actuator through a minute-drive apparatus so as to be minutely driven in a focusing direction relative to the servo objective lens. When the servo objective lens is focused on the servo layer, a reading light beam is quickly focused on a target one of the plurality of recording layers. | 04-08-2010 |
20100232264 | OPTICAL INFORMATION RECORDER/REPRODUCER, OPTICAL INFORMATION RECORDING/REPRODUCING METHOD AND CONTROL CIRCUIT - A distance control circuit ( | 09-16-2010 |
20100254232 | LENS UNIT, OPTICAL SYSTEM, RECORDING/PLAYBACK APPARATUS AND METHOD FOR RECORDING TO AND/OR REPRODUCING FROM A RECORDING MEDIUM - A lens unit, an optical system, a recording/playback apparatus and a method for recording to and/or reproducing from a recording medium to compensate for a spherical aberration and perform stable recording or reproduction of data in recording or reproducing data to or from a recording medium having a plurality of recording layers are disclosed. The lens unit includes a first lens for condensing light beams outputted from a light source to a recording medium, a second lens for increasing a numerical aperture of the first lens to form a near field, and a liquid crystal device for compensating for a spherical aberration included in the first lens and the second lens, thereby compensating for the spherical aberration. | 10-07-2010 |
20100284254 | NEAR FIELD OPTICAL DISC AND NEAR FIELD OPTICAL DISC READING APPARATUS - A near field optical disc and a near field optical disc reading apparatus are provided. The near field optical disc has at least one light source and a near field optical pick-up head, and the near field optical disc includes a light guiding substance, a first reflection layer and a second reflection layer. The light guiding substance has a first surface, a second surface opposite thereto and at least one light entrance window. Light emitted from the light source enters the light guiding substance through the light entrance window. The second reflection layer is disposed on the second surface. The first reflection layer is disposed on the first surface and has a plurality of light pervious holes. A part of the light is transmitted through the light pervious holes and picked up by the near field optical pick-up head. | 11-11-2010 |
20110080814 | OPTICAL DISC APPARATUS AND METHOD OF MAKING LAYER-TO-LAYER JUMP IN MULTILAYER OPTICAL DISC - A layer-to-layer jumping method according to the present invention includes, after a layer-to-layer jump has been started in a multilayer optical disc, the step ST | 04-07-2011 |
20110096645 | OPTICAL HEAD FOR OPTICAL RECORDER/REPRODUCER - An optical head for recording or reproducing a signal on or from an optical recording medium including a light source, an objective lens for condensing light emitted from the light source to the optical recording medium, and a light-separating device arranged between the light source and the objective lens in order to separate the light reflected from the optical recording medium from the light emitted from the light source. The light-separating device includes a first glass, a multilayer film formed on the first glass, and an adhesive layer arranged on the multilayer film in order to bond a second glass onto the multilayer film. The majority of the light emitted from the light source enters into the light-separating device through the first glass and is reflected by the multilayer film. | 04-28-2011 |
20110122744 | OBJECTIVE LENS UNIT, OPTICAL PICKUP, AND OPTICAL INFORMATION APPARATUS - An objective lens unit according to the present invention includes a first objective lens | 05-26-2011 |
20110122745 | OBJECTIVE LENS UNIT, OPTICAL PICKUP, AND OPTICAL INFORMATION APPARATUS - An objective lens unit according to the present invention includes a first objective lens | 05-26-2011 |
20110141864 | TILT CONTROL METHOD OF NEAR-FIELD OPTICAL SYSTEM - A tilt control method for a near-field optical disc drive is provided. A gap between a lens and a disc is estimated. A tilt compensation for the lens is estimated according to a tilt signal when the lens is within a far-field region. A coarse tilt control is performed on the lens according to the tilt compensation when the lens is within the far-field region. | 06-16-2011 |
20110205867 | OPTICAL RECORDING MEDIUM, AND SERIES OF OPTICAL RECORDING MEDIA - In a multilayer optical recording medium, it is an object to suppress generation of crosstalk while reducing an interlayer distance of recording and reading layers. In an optical recording medium including three or more recording and reading layers, a first distance, and a second distance greater than the first distance by 3 μm or more are alternately defined as interlayer distances of recording and reading layers. | 08-25-2011 |
20110242951 | OPTICAL PICKUP, OPTICAL DRIVE APPARATUS, AND LIGHT ILLUMINATION METHOD - There is provided an optical pickup including: an optical-system having an object-lens illuminating a first light for information recording or reproducing on a recording layer as a target and a second light on an optical-recording medium including a reference plane having a reflection-layer and the recording-layer at a layer position different from that of the reference-plane and on which information recording is performed through mark formation, and a focus-aligned-position-adjusting unit adjusting a focus-aligned position of the first light through the object-lens by changing collimation thereof incident to the object-lens; and a focusing-mechanism driving the object-lens in a focusing direction, wherein, when a depth of focus λ/NA | 10-06-2011 |
20120002517 | OPTICAL DISC, OPTICAL DISC MANUFACTURING METHOD, OPTICAL DISC RECORDING DEVICE AND OPTICAL DISC REPRODUCTION DEVICE - An optical disc includes a reflective film formed on concave and convex marks after the concave and convex marks are synchronized with the integral multiple of a channel bit length and formed in accordance with modulated main information. Thereafter, continuous or intermittent laser light synchronized with the integral multiple of the channel bit length is irradiated at intervals longer than the longest one of the concave and convex marks in accordance with a spiral track formed in a circumferential direction of the concave and convex marks, whereby an optical characteristic of the reflective film is changed to form a recordable mark and sub-information necessary to reproduce the main information is recorded in a superimposition manner. | 01-05-2012 |
20120087220 | OPTICAL PICKUP AND OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS - An optical pickup includes a light source, an optical system for irradiating a recording medium including a plurality of recording layers with light from the light source, a diffraction optical element that divides light reflected from the recording medium into a plurality of optical fluxes and diffracts the fluxes, and an optical detector receiving the optical flux diffracted by the diffraction optical element. The optical detector includes a light receiving element detecting a focus error signal, wherein a longitudinal direction of the light receiving element is arranged to coincide with a circumferential direction of the recording medium, or arranged to be inclined to a circumferential or radial direction. | 04-12-2012 |
20120092976 | RECORDING APPARATUS AND CONTROL METHOD - A recording apparatus including: a light-illuminating/receiving-unit illuminating an optical-disc-recording-medium through a common object-lens with recording-light and ATS-light and receiving reflected-ATS-light; a rotation-driving-unit driving rotation of the medium; a tracking-mechanism driving the lens in a tracking-direction parallel to the radial direction; a tracking-error-signal-generation-unit generating a tracking-error-signal; and a tracking-servo-controller performing tracking-servo-control on the lens based on the tracking-error-signal, wherein the tracking-servo-controller includes: a servo-calculation-unit based on the tracking-error-signal in a feedback-loop as a tracking-servo-loop; and a feed-forward-controller calculating an estimated control-target-value of the tracking-servo-control based on an estimated illumination-spot-position value of the ATS-light obtained in a first-filter-process emulating a transfer-characteristic of the tracking-mechanism on an output of the servo-calculation-unit and a distance between the illumination-spot-positions and applies a control-signal generated in a second-filter-process on the estimated value for suppressing a transfer-characteristic-gain of the tracking-servo-loop to 0 dB or less in the entire band to the tracking-servo-loop. | 04-19-2012 |
20120113775 | RECORDING APPARATUS - A recording apparatus includes: a light-emitting/receiving unit which emits a recording beam, an ATS beam, and a position control beam toward an optical disc recording medium via a common object lens; a tracking mechanism which drives the object lens in a tracking direction parallel to a radial direction of the optical disc recording medium; a reference plane-side tracking error signal generation unit which generates a reference plane-side tracking error signal; a reference plane-side tracking servo signal generation unit which generates a reference plane-side tracking servo signal to cancel out a tracking error; a tracking driving unit which drives the tracking mechanism; an ATS-side tracking error signal generation unit which generates an ATS-side tracking error signal; an ATS control signal generation unit which generates an ATS control signal to cancel out a tracking error; and a signal providing unit which provides the ATS control signal to a tracking servo loop. | 05-10-2012 |
20120113776 | SPOT POSITION CONTROL DEVICE AND SPOT POSITION CONTROL METHOD - A spot position control device includes a light irradiation and light sensing unit irradiating an optical recording medium with first light via an objective lens and sensing reflection light of the first light from the optical recording medium having a pit string where an interval between pit formable positions on one round is limited to a first interval, a tracking mechanism unit displacing the objective lens, a clock generation unit generating a clock corresponding to the interval between the pit formable positions, a timing selector signal generation unit generating a plurality of timing selector signals, a tracking error signal generation unit generating tracking error signals, a linear tracking error signal generation unit generating a linear tracking error signal indicating a tracking error amount linearly, a tracking servo control unit performing a tracking servo control, and an offset giving unit giving an offset to a tracking servo loop. | 05-10-2012 |
20120170431 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE AND INFORMATION PROCESSING DEVICE - An optical head device includes a light blocking region ( | 07-05-2012 |
20120182845 | OPTICAL DISC DEVICE AND LASER BEAM POWER CONTROLLING METHOD FOR OPTICAL DISC DEVICE - Erroneous data erasure owing to radiation of laser beam with excessive power to the recording layer of the multilayered optical disc upon servo-off while reproducing data of the disc is prevented. When detecting the servo-off based on the amplitude of the tracking error signal or the focus error signal, the laser beam power is reduced to a predetermined minimum value, and the laser beam power value is set again based on the address of the recording medium, which has been obtained later for reproduction. The laser beam power value is changed by applying an offset to the drive current or changing the target value under APC. | 07-19-2012 |
20120182846 | Device for Recording, Erasing and Reading Data on a Multi-Layer Optical Disc - The invention relates to three-dimensional optical memory devices and can be used in all areas of computing in which it is necessary to record large data files on compact carriers, and also for recording, erasing and reading video data, for example, in independent video viewing systems. The device comprises an optical disc positioning system, a source of radiation with two different wavelengths that is optically coupled to a focusing system, focusing system positioning means, and an optical sensor that is optically coupled to the focusing system via a spectrum splitter and an controlled spectrum selector placed between the source of radiation with two different wavelengths and the spectrum splitter, wherein the focusing system is designed with longitudinal chromatic aberration at the given wavelengths. | 07-19-2012 |
20120201110 | 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 afterward 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. | 08-09-2012 |
20120218872 | OPTICAL DISC DEVICE - An optical disc device includes an optical source for emitting an optical beam, an incident intensity control circuit for controlling an intensity of the optical beam emitted from the optical source, an objective lens for focusing the optical beam on an optical disc, an optical detector for receiving the optical beam reflected from the optical disc, and a servo signal generation circuit for generating a focus error signal from the optical detector, by this configuration, the optical beam is varied once to a third optical beam intensity to be present in between a first optical beam intensity and a second optical beam intensity when varying from the first optical beam intensity up to the second optical beam intensity different from the first optical beam intensity, and the incident intensity control circuit is controlled such that the variation of focus error signal is not exceeded over a predetermined range. | 08-30-2012 |
20120218873 | METHOD AND DEVICE FOR SENSITIVITY COMPENSATION - Method and device for generating a control voltage for a position actuator of a disk drive system for displacing a lens of a pick-up unit to a given X-position. The actuator is operated by an open loop control system. First, parameters of the control system are calibrated so that the control system produces a control voltage (Va) from an input position signal (Xact_setp). Then, the control voltage is processed in a feed forward system for generating a processed control signal (Va_p) which is fed to the position actuator for displacing said lens to the X-position. A Z-value corresponding to the axial distance of the lens from a calibrated axial position and a temperature of the pick-up unit are measured. The position actuator operates according to the formula: | 08-30-2012 |
20120294128 | RECORDING APPARATUS AND SERVO CONTROL METHOD - A recording apparatus includes the following elements. A recording light source emits pulse laser light for recording. A first light source emits first CW laser light. An irradiation optical system irradiates an optical recording medium with the pulse laser light and the first CW laser light via an objective lens in the state in which the optical axis of the first CW laser light is tilted with respect to the optical axis of the pulse laser light. A reception optical system outputs, to a first light receiver, a returned light portion of the first CW laser light which has been reflected by a reflection surface formed on the optical recording medium and which has been input through the objective lens. A focus servo controller performs focus servo control for the objective lens on the basis of a first reception signal obtained by the first light receiver. | 11-22-2012 |
20120300601 | OPTICAL RECORDING MEDIUM, RECORDING DEVICE, AND RECORDING METHOD - An optical recording medium includes: N recording layers (where N≧4); a number of kinds of layer intervals between the recording layers adjacent to each other being an integer M equal to or less than a minimum integer equal to or more than log | 11-29-2012 |
20130010580 | RECORDING APPARATUS AND RECORDING METHOD - Provided is a recording apparatus including a light irradiation and receiving unit configured to irradiate recording light for performing mark recording to a recording layer and an adjacent servo light for an adjacent track servo onto an optical disc recording medium having the recording layer through a common objective lens, and to receive reflected light from the recording layer of the adjacent servo light, a tracking mechanism configured to drive the objective lens in a tracking direction which is the disc radial direction, a tracking servo signal generation unit configured to obtain a corrected servo error signal as a servo error signal based on a light receiving signal for the adjacent servo light, and to generate a tracking servo signal using the corrected servo error signal, and a tracking driving unit configured to drive the tracking mechanism based on the tracking servo signal. | 01-10-2013 |
20130033974 | SERVO CONTROL DEVICE, OPTICAL DISK DEVICE, AND DATA TRANSFER METHOD - A servo control device includes: a phase compensator configured to generate a plurality of types of control values for controlling a driver based on a signal output from an optical pickup, and output the control values; and a transfer data generator configured to serially transfer the control values to the driver. The phase compensator sends, to the transfer data generator, a notification that the phase compensator has output a control value which needs to be sent with a reduced delay among the control values. In response to the notification, the transfer data generator determines whether or not the transfer data generator is transferring one of the control values, and if the transfer data generator is not transferring one of the control values, the transfer data generator starts transferring a control value associated with the notification among the control values. | 02-07-2013 |
20130100787 | OPTICAL INFORMATION APPARATUS AND INFORMATION RECORDING OR REPRODUCING METHOD - An optical head ( | 04-25-2013 |
20130121122 | OPTICAL INFORMATION DEVICE AND LOSS-OF-CONTROL DETECTION METHOD - Provided is an optical disc device including a focus control unit for performing control so that a convergent point of a main beam converges on a predetermined information layer, a tracking control unit for performing control so that the convergent point of the main beam scans a predetermined track or a predetermined mark sequence on an information layer, a sub beam receiving unit for receiving a sub beam reflected off the information layer and outputting a signal according to an amount of beam received, and a microcomputer for detecting, during a recording operation of recording the information, a focus loss-of-control state where the convergent point of the main beam deviates from the predetermined information layer or a tracking loss-of-control state where the convergent point of the main beam deviates from the predetermined track or the predetermined mark sequence on the information layer. | 05-16-2013 |
20130182546 | PHOTO DETECTING ELEMENT, AND OPTICAL PICK-UP DEVICE AND OPTICAL DISC DRIVE INCLUDING THE PHOTO DETECTING ELEMENT - Provided is a photo detecting element that has a simplified structure and that is easily manufactured and assembled, and an optical pick-up device including the photo detecting element. The photo detecting element includes an optical sensor, an amplifier for amplifying a signal from the optical sensor, and a non-linear multi-step variable resistor to adjust a gain of the amplifier | 07-18-2013 |
20130229897 | PHOTO DETECTING ELEMENT, AND OPTICAL PICK-UP AND DISC DRIVE INCLUDING THE SAME - Provided is a photo detecting element including a body with an optical sensor and an amplification unit for amplifying a signal output from the optical sensor. The photo detecting element includes a driving voltage port that applies a driving voltage to the amplification unit, a ground port that provides a ground for the amplification unit, and a plurality of output ports interposed between the driving voltage port and the ground port, and outputting a signal received from the amplification unit. The driving voltage port, ground port, and plurality of output ports are disposed on the same one side of the body. | 09-05-2013 |
20130235708 | Optical Storage Device with Direct Read after Write - A system and method for providing direct read after write functionality in an optical data storage device include an optical head having a first coherent light source modulated at higher power during writing of data to the optical medium and a second coherent light source operating in a continuous wave mode at lower power while the first coherent light source is writing data. Optic components combine light from the first and second light sources and focus light from the first coherent light source to a first spot of a selected track on the optical medium and focus light from the second coherent light source to a second spot on the selected track downstream from the first spot relative to movement direction of the optical medium to read and verify the data directly after writing during the write process rather than in a separate verification process. | 09-12-2013 |
20140078874 | APPARATUS AND METHOD FOR CONTROLLING TAPE MOVEMENT IN A ROTARY HEAD DATA STORAGE SYSTEM AND RETRIEVAL SYSTEM - A method is provided for controlling movement of a tape in a data storage and retrieval system having a tape roller servo subsystem for controlling movement of a tape, and a head servo subsystem for controlling position of a head element mounted on a rotatable carriage unit. The method includes receiving, from the head servo subsystem, a head element position feedback signal at the tape roller servo subsystem; and controlling movement of the tape by the tape roller servo subsystem based, at least in part, on the head element position feedback signal. | 03-20-2014 |
20140126341 | LENS DRIVING DEVICE AND OPTICAL PICKUP - A lens driving device includes a lens holder that holds a lens, a driving portion that drives the lens holder through a magnetic force produced using a coil and a magnet, and a guide shaft that supports the lens holder movably. When moving the lens holder to a target position, an AC voltage is applied to the coil over a specific interval from a beginning of movement of the lens holder. Further, an amplitude of the AC voltage is reduced stepwise with the passage of time. | 05-08-2014 |
20150117172 | OPTICAL PICKUP - An optical pickup includes a pair of first tracking coils near the center of the lens holder in the tracking direction on one side of the holder; a pair of first magnets facing the first tracking coils and near the outer sides of the holder in the tracking direction; a pair of second tracking coils near the outer sides of the holder on another side of the holder; and a pair of second magnets facing the second tracking coils and near the center of the holder. The vertical electromagnetic force F in each of the first tracking coils is larger than the vertical electromagnetic force f in each of the second tracking coils. A distance K between the action center of the force F and the support center of the movable part is shorter than a distance k between the action center of the force f and the support center. | 04-30-2015 |
20160019925 | OPTICAL PICKUP DEVICE - An optical pickup device is one in which a lens holder is held by a movable base by using a resilient wire. A restricting abutting portion is formed at a lower portion of the lens holder. When the lens holder moves excessively downward, the restricting abutting portion comes into contact with a stopper portion to restrict a downward movement of the lens holder, so that it is possible to prevent the lens holder from contacting a unit chassis. When the unit chassis is not mounted on the movable base, it is possible to prevent excessive flexing of the resilient wire caused when an opposing abutting portion of the lens holder comes into contact with the unit chassis. | 01-21-2016 |