Class / Patent application number | Description | Number of patent applications / Date published |
369121000 | With particular light source (e.g., laser, CRT with phosphor) | 43 |
20080205250 | Operating Optical Drive Using Parameters - The invention relates to operating an optical drive apparatus from parameters read from an associated record carrier. Data-aided adaptation loops are often used in modern communication and storage systems. To ensure fast and robust start-up by ensuring a stable starting point in an adaptation loop and a fast convergence of the adaptation loop, an information data field is provided on, and read from by the drive, an associated optical record carrier. The information data field comprising start-up parameters, the start-up parameters comprising information about recommended write parameters and information related to a resulting channel response for the case when the recommended write parameters are used. In a start-up situation of the optical drive apparatus, the channel response of the bit detector is computed based on the start-up parameters. | 08-28-2008 |
20080212455 | Method of Enhancing Laser Operating Efficiency - A method of enhancing laser operating efficiency of a laser ( | 09-04-2008 |
20080225675 | Optical disk apparatus - An optical disk apparatus includes: a semiconductor laser which emits laser light; a focusing unit which focuses the laser light emitted from the semiconductor laser onto an optical disk; a detector which receives reflected light from the optical disk; a drive unit which rotates the optical disk; and a control unit which controls the semiconductor laser and the drive unit. When the optical disk is reproduced, the control unit causes the semiconductor laser to emit the laser light by a first power realizing a relative intensity noise tolerable for the reproduction of the optical disk. And the control unit causes the drive unit to rotate the optical disk at a first linear velocity which is free from reproduction light deterioration when the semiconductor laser emits the laser light by the first power. | 09-18-2008 |
20080253268 | Method and System for Recording Data by a Plurality of Laser Beams on an Optical Disc - The invention relates to a method and system for recording data by a plurality of laser beams (A, B) on an optical disc, said optical disc comprising segments which ( | 10-16-2008 |
20080259777 | Optical Pickup Device and Optical Disc Device - An optical pickup device | 10-23-2008 |
20080259778 | PROCESS FOR INTENTIONAL DETERIORATION OF THE CONTENTS OF AN OPTICAL RECORDING MEDIUM - The invention relates to the field of optical information recording. In order to prevent abusive or fraudulent use of storage media, the invention provides a process for intentional degradation of information by application of a laser power below the normal power for reading information recorded in super-resolution on the media. This process relies on the surprising observation that a laser power below the super-resolution read power produces an irreversible degradation of the information recorded. This observation has been made with regard to media composed of a three-layer structure comprising an InSb or GaSb layer between two ZnS/SiO | 10-23-2008 |
20080267046 | OPTICAL HEAD DEVICE AND OPTICAL INFORMATION DEVICE USING THE SAME, COMPUTER, OPTICAL DISK PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISK RECORDER, AND OPTICAL DISK SERVER - It is an object of the present invention to record to and reproduce different types of optical disks using light beams with different wavelengths. In an optical head device for recording to and reproducing high-density optical disks using an objective lens with a large NA, a sawtooth-shaped hologram is used for recording to and reproducing conventional optical disks such as DVDs. For blue light, a sawtooth height is the light path length | 10-30-2008 |
20080285427 | OPTICAL PICK-UP AND DISC APPARATUS HAVING THE SAME - An optical pick-up and a disc apparatus having the same to overcome an inferiority of a tracking signal caused by an adjacent layer during the recording and/or reproducing of data an optical disc with multiple recording layers are provided, the optical pick-up including: a light source to emit a light with a predetermined wavelength corresponding to a type of the optical disc; a light collecting unit to focus the emitted light to form a light spot on a signal recording layer of the optical disc, wherein the signal recording layer reflects the light as a signal light and an adjacent layer of the optical disc reflects the light as a noise light; a photodetector to detect a signal by receiving the signal light; and an optical member to intercept the noise light in order to decrease an intensity of the noise light entering the photodetector. | 11-20-2008 |
20080298217 | OPTICAL PICKUP DEVICE, OPTICAL DISC APPARATUS INCLUDING OPTICAL PICKUP DEVICE, AND METHOD OF MANUFACTURING OPTICAL PICKUP DEVICE - An optical pickup device includes a pickup base, an optical system, a light emitting element, and a heat transfer holder which transfers the heat of the light emitting element to the pickup base. The heat transfer holder includes a holder base and a holder main body overlapped to the holder base. The holder base is arranged around the light emitting element and has a first flat contact surface which comes into surface contact with an abutment surface of the pickup base, and a second spherical contact surface, which is positioned opposite to the first contact surface. The holder main body has a third spherical contact surface which comes into surface contact with the second contact surface of the holder base, and an engaging recess formed in the third contact surface and having an inner surface which contacts with the light emitting element. | 12-04-2008 |
20090003185 | OPTICAL DISC APPARATUS AND OPTICAL DISC APPARATUS CONTROL METHOD - According to one embodiment, an optical disc apparatus includes a laser diode configured to irradiate a laser beam onto an optical disc, a laser drive circuit configured to supply the laser diode with a laser drive current superposed with a high frequency electric current according to defined conditions of the high frequency electric current in order to turn the laser beam output from the laser diode to a multimode laser beam, a detecting section configured to detect a frequency condition of the high frequency electric current to reduce a quantity of interlayer crosstalk, and a setting section configured to set the detected condition in the laser drive circuit. | 01-01-2009 |
20090022041 | Recording Medium, Recording Apparatus and Method, and Reproducing Apparatus and Method - A recording medium ( | 01-22-2009 |
20090034403 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - An optical pickup device which can more improve heat radiation efficiency and an optical disk apparatus including the optical pickup device are provided. The optical pickup device having a base ( | 02-05-2009 |
20090052307 | OBJECTIVE OPTICAL SYSTEM AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE HAVING THE SAME - There is provided an objective optical system for an optical information recording/reproducing device. The objective optical system includes an optical element having an annular zone structure on at least one surface. The annular zone structure includes annular zones configured to have at least one step formed, at a boundary between adjacent ones of the annular zones, to extend in a direction of an optical axis. The at least one step is provided to cause a predetermined optical path length difference between a light beam passing through an outside of the boundary and a light beam passing through an inside of the boundary. The predetermined optical path length difference given to a first light beam by the at least one step is approximately equal to an odd multiple of a first wavelength λa. Abbe number of material of the optical element satisfies a condition of 15<νd<35. | 02-26-2009 |
20090109831 | SEMICONDUCTOR LASER DEVICE PROTECTION CIRCUIT, OPTICAL PICKUP APPARATUS, AND INFORMATION RECORDING/REPRODUCING APPARATUS - A semiconductor laser device has a cathode grounded and an anode connected to a collector of a transistor. The transistor has an emitter grounded and a base connected to a first external terminal via a first resistor. A digital transistor has a collector connected to the base of the transistor, an emitter grounded, and a base connected to a second external terminal via a resistor. When a voltage equal to or higher than the predetermined first voltage is applied to the base of the transistor, the transistor is put into a conducting state, and the semiconductor laser device is grounded via the transistor and thereby protected from static electricity and leak current. | 04-30-2009 |
20090122689 | OPTICAL READING METHOD AND OPTICAL READING SYSTEM - An optical reading method which suppresses variations in the reading quality of a low-reflection optical recording medium. The optical reading method is to read information from an optical recording medium by irradiating the medium with read laser light having a wavelength λ of 400 to 410 nm. In this method, an information recording layer of the optical recording medium is irradiated with the read laser light with an average read power P | 05-14-2009 |
20090168634 | Optical disc drive apparatus with an indirect semiconductor laser containing an asymmetric quantum well structure - An indirect semiconductor laser having an indirect semiconductor used as the material of an active layer is used, instead of a conventional direct semiconductor laser so as to obtain a reproducing optical source, in order to reduce optical interference noise of the laser caused in the optical head in an optical disc apparatus, and to eliminate the necessity of high frequency wave convolution, thereby it is possible to reduce the cost. | 07-02-2009 |
20090201791 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus comprising: a polarization beam splitter fixed to a base, which includes a first prism that laser light emitted from a laser diode enters, a second prism that return light of the laser light reflected from a signal recording layer of an optical disc enters, and a control film that is formed on either one of opposed surfaces of the first and second prisms so that the laser light and the return light are selectively passed through or reflected from the control film, the opposed surfaces being opposed to each other; and first and second positioning pins provided on the base to position the polarization beam splitter, the polarization beam splitter being fixed to the base in a state where the opposed surface of at least one of the first and second prisms is made in contact with at least one of the first and second positioning pins. | 08-13-2009 |
20090245076 | LASER DRIVING CIRCUIT, ITS RECORDING COMPENSATION METHOD AND OPTICAL-DISK APPARATUS - A laser driving circuit employing a recording compensation circuit configured to generate a light emission timing of a laser on the basis of recorded data and a recording clock signal which are supplied to the recording compensation circuit includes: a phase synchronization circuit; a skew determination circuit; and a data latching circuit. | 10-01-2009 |
20090245077 | Optical Recording Method and Optical Recording Apparatus - Disclosed is an optical recording method. The optical recording method includes irradiating an area where a recording mark is formed in a medium with a pulse train of laser light, and irradiating the area where the recording mark is formed with continuous-wave laser light that is continuously output. | 10-01-2009 |
20090257340 | OPTICAL HEAD - To provide an optical head to produce good servo and read signals by reducing the influence of interference by light reflected from a non-read layer of a multilayer optical disc. | 10-15-2009 |
20090323505 | Apparatus for reading from an optical recording medium - An apparatus for reading from an optical recording medium, and more specifically to an apparatus suitable for reading from an optical recording medium having a high data density is proposed. | 12-31-2009 |
20100103805 | SEMICONDUCTOR LASER DRIVING DEVICE, OPTICAL HEAD DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE - A semiconductor laser driving device is provided with a high frequency superimposing circuit ( | 04-29-2010 |
20100165825 | OPTICAL RECORDING/REPRODUCING DEVICE - An optical recording and reproducing apparatus is provided for recording standing wave information on an optical recording medium and reproducing standing wave information from an optical recording medium. The optical recording and reproducing apparatus includes an optical head configured to separate a laser beam emitted from a light source ( | 07-01-2010 |
20100238784 | Multiwavelength semiconductor laser and optical recording/reproducing device - The present invention provides a multiwavelength semiconductor laser capable of easily setting reflectance in a predetermined range at different oscillation wavelengths on a main emission edge face side. The multiwavelength semiconductor laser includes a plurality of semiconductor light emission parts of an edge emitting type having different oscillation wavelengths, and a reflection film provided commonly for main emission edge faces of the semiconductor light emission parts. The reflection film includes, in order from the semiconductor light emission parts, a first dielectric film (refractive index n | 09-23-2010 |
20100254249 | SHORT-PULSE SOURCE DEVICE, LASER DRIVING METHOD, OPTICAL PICKUP, AND OPTICAL DISC APPARATUS - The present invention realizes the emission of a high-output short-pulse beam and a reduction in power consumption. A laser control unit ( | 10-07-2010 |
20100322063 | OPTICAL INFORMATION REPRODUCING APPARATUS AND OPTICAL INFORMATION REPRODUCING METHOD - An optical information reproducing apparatus includes: an irradiation section irradiating a light beam onto an optical information recording medium, in which holes are formed along a virtual track on a recording medium, along the virtual track; a light receiving section receiving a reflected light beam when the light beam is reflected by the optical information recording medium and sequentially generating a light receiving signal corresponding to the light intensity; a detection section detecting a variation pattern appearing when a signal level of the light receiving signal changes according to the hole; and a code string generating section, when generating a code string corresponding to the signal level, generating a code corresponding to the one hole from the variation pattern if the variation pattern falls within a range and generating a code string, which includes a plurality of codes, from the variation pattern if the variation pattern exceeds the range. | 12-23-2010 |
20110080822 | OPTICAL DISC DRIVE - When a multilayered optical disc is used, the signal-to-noise ratio of a read signal is decreased as effective reflectance is extremely low due to the influence of reflection and absorption by front recording layers. Further, when a high-frequency modulation technology is used to suppress returned light noise of a laser, the erasure of recorded information is likely to occur on certain types of discs, making it difficult to simultaneously achieve the suppression of returned light noise of a laser and the prevention of the erasure of recorded information. To address the above problems, the present invention includes a section that performs a read by executing a multi-tone demodulation. The present invention also includes a section that controls the position and shape of a read light pulse to be radiated on a recording layer. | 04-07-2011 |
20110235497 | OPTICAL PICKUP DEVICE - The aberration takes place according to the height of the image because the laser light tilts from the optical axis when it enters to the object lens in the optical pickup device which is equipped with a laser diode for BD and the monolithic laser diode capable of irradiating laser lights with two different wavelengths for DVD and CD as one package to read the signal by single object lens and single optical system. This is because the light sources of the three lights with different wavelengths are away from each other in the optical pickup device. The emission point of the laser diode for BD is formed at the location shifted from the center of the chip. The laser diode for BD is disposed adjacent to the monolithic laser diode capable of irradiating laser lights with two wavelengths for DVD and CD to make the emission point closer to the monolithic laser diode. The sizes of these two laser diodes is minimized by employing half dicing during the cleavage processing for separating the chips. Therefore, the distance among the emission points can be reduced even with the configuration where two laser diodes are disposed on the substrate in lateral. | 09-29-2011 |
20110242960 | LIGHT EMITTING DEVICE AND METHOD FOR MANUFACTURING LIGHT EMITTING DEVICE - A light emitting device includes a base, a light-emitting module, and a shielding case. The light-emitting module is fixed to the base via a curved flexible printed-circuit. The shielding case fixed to the base in such a manner that the light-emitting module is held in a position to resist a restoring force of the flexible printed-circuit which is generated by the curve of the flexible printed-circuit. The light-emitting module includes a heat source, and the shielding case includes a projection. The projection controls movement of the light-emitting module in a direction perpendicular to the direction in which the light-emitting module is held by the shielding case. The projection and the light-emitting module are bonded to each other with silicone. | 10-06-2011 |
20110317540 | VERTICAL CAVITY SURFACE EMITTING LASER, VERTICAL-CAVITY-SURFACE-EMITTING-LASER DEVICE, OPTICAL TRANSMISSION APPARATUS, AND INFORMATION PROCESSING APPARATUS - A vertical cavity surface emitting laser including a substrate, a first semiconductor multilayer film reflector formed on the substrate, an active region formed on the first semiconductor multilayer film reflector, a second semiconductor multilayer film reflector formed on the active region, an electrode formed on the second semiconductor multilayer film reflector, a light absorption layer, and a light transmission layer. In the electrode, a light emitting aperture is formed. The light absorption layer is formed in a peripheral region of the light emitting aperture, and absorbs emitted light. The light transmission layer is composed of a material which the emitted light can pass through, and formed in a central region of the light emitting aperture. Thicknesses of the light absorption layer and the light transmission layer are selected so that phases of light from the light absorption layer and from the light transmission layer are adjusted. | 12-29-2011 |
20120147727 | VERTICAL CAVITY SURFACE EMITTING LASER, VERTICAL-CAVITY-SURFACE-EMITTING-LASER DEVICE, OPTICAL TRANSMISSION APPARATUS, AND INFORMATION PROCESSING APPARATUS - A vertical cavity surface emitting laser includes a semiconductor substrate, a first semiconductor multilayer film reflector of a first conductivity type laminated on the semiconductor substrate, a resonator, and a second semiconductor multilayer film reflector of a second conductivity type laminated on the resonator. In each of the first and second semiconductor multilayer film reflectors, a pair of a high-refractive-index layer and a low-refractive-index layer is stacked. The resonator includes an active layer laminated on the first semiconductor multilayer film reflector. The resonator includes a pair of spacer layers and a resonator extending region. A composition of at least a layer included in the resonator extending region is different from any of compositions of the semiconductor substrate, the first semiconductor multilayer film reflector, and the second semiconductor multilayer film reflector. | 06-14-2012 |
20120257490 | Gratings For Waveguide Coupling - An apparatus includes a waveguide including a core layer and first and second cladding layers positioned on opposite sides of the core layer, a plurality of slots extending through the core layer and into the first and second cladding layers, a filler material in the slots, wherein the core has a first refractive index, the cladding layers have a second refractive index lower than the first refractive index, and the filler material has a third refractive index between the first and second refractive indices, and a light source positioned to direct light onto the slots. A data storage device that includes the apparatus is also provided. | 10-11-2012 |
20130077459 | OPTICAL DISC AND RECORDING AND REPRODUCING APPARATUS AND METHOD - In a recording and reproducing apparatus, an optical disc is rotated in a rotating direction and an optical system focuses a laser beam on the optical disc to form a beam spot on the optical disc. The optical system is provided with a scanner which deflects the laser beam along a radial direction of the optical disc in such a manner that the beam spot follows a first scan trajectory along a first direction crossing the rotating direction and a second scan trajectory along a second direction different from the first direction. A first data track with a sequence of recording pits along the first scan trajectory is formed and arranged on the optical disc. | 03-28-2013 |
20130182551 | OPTICAL DISK DEVICE AND OPTICAL PICKUP THEREFOR - When an optical pickup used an optical disk device is formed, a PWB (Printed Wiring Board) which serves as a top cover is used at at least a part of a surface of a housing which houses the optical pickup, the surface facing an optical disk. The PWB (Printed Wiring Board) is adapted to seal components inside the optical pickup, and to reduce the flexure of FPC (Flexible Printed Circuits). Moreover, the printed wiring board is provided with a connector which allows the connection of FPC for connection to circuits outside the optical pickup. | 07-18-2013 |
20130188468 | Legally Safe Recordable Information Storage Medium - A recordable information consists of a flat polycarbonate disk having two main faces and a light sensitive film covering one main face and on which information may be recorded. The film is multi-layered with at least two elementary superposed layer respectively containing one element A and one element B, one of the layers containing an element chosen in the Group IIIa, while the other layer contains an element chosen in Groups Va or VIa; or one of layers contains an element from Groups IIa or IIb while the other layer contains an element from Group VI. The thickness of each layer is nearly identical and the overall thickness of the light-sensitive film being at least equal to 35 nm. A burning process for safely and durably recording information on such a medium is also disclosed. | 07-25-2013 |
369122000 | Solid state | 8 |
20090268591 | HIGH-FREQUENCY SUPERIMPOSING METHOD AND OPTICAL DISK APPARATUS USING IT - An optical disk drive includes drive current generation unit for supplying a mark forming semiconductor laser drive current and a space forming semiconductor laser drive current; first high-frequency superimposition unit for superimposing a high-frequency component on the space forming semiconductor laser drive current; and high-frequency superimposition control unit for controlling the first high-frequency superimposition unit to stop the superimposition of the high-frequency component for a predetermined duration prior to a timing at which to switch from the space forming semiconductor laser drive current to the mark forming semiconductor laser drive current, eliminating positional variations on the disk of the mark leading and trailing edges due to the high frequency superimposition. | 10-29-2009 |
20100080107 | METHOD FOR PRODUCING SEMICONDUCTOR LASER, SEMICONDUCTOR LASER, OPTICAL PICKUP, AND OPTICAL DISK DRIVE - A method for producing a semiconductor laser having an edge window structure includes the steps of forming masks of insulating films on a nitride-based III-V compound semiconductor substrate including first regions and second regions periodically arranged in parallel therebetween; and growing a nitride-based III-V compound semiconductor layer in a region not covered by the masks. The first region between each two adjacent second regions has two or more positions, symmetrical with respect to a center line thereof, where laser stripes are to be formed. The masks are formed on one or both sides of each of the positions where the laser stripes are to be formed at least near a position where edge window structures are to be formed such that the masks are symmetrical with respect to the center line. The nitride-based III-V compound semiconductor layer includes an active layer containing at least indium and gallium. | 04-01-2010 |
20100265811 | INFORMATION RECORDING MEDIUM, METHOD FOR MANUFACTURING THE SAME, AND RECORDING/REPRODUCING APPARATUS - In an information recording medium including a substrate and an information layer having a recording layer, on and from which information is recorded and reproduced by laser beam application, the recording layer is made from a Te—O-M | 10-21-2010 |
20100271928 | ULTRASHORT PULSE LIGHT SOURCE AND TWO-PHOTON ABSORPTION RECORDING MEDIUM RECORDING APPARATUS HAVING THE SAME - Providing a soliton mode-locked solid-state laser that includes a resonator, a first end of which is formed of a semiconductor saturable absorption mirror, a solid-state laser medium, a negative group velocity dispersion compensator for compensating for group velocity dispersion within the resonator, and an excitation optical system that outputs excitation light for exciting the solid-state laser medium, and oscillates soliton pulse laser light with a repetition frequency of not less than 1 GHz, an intensity modulator that includes a waveguide electrooptic modulator for modulating intensity of the soliton pulse laser light and a driver for applying a voltage to the waveguide electrooptic modulator according to desired information, and a nonlinear optical element for converting the intensity-modulated soliton pulse laser light to a second harmonic wave. | 10-28-2010 |
20110199886 | Optical Pickup Apparatus - An optical pickup apparatus includes: a circuit board; a laser diode mounted on one face of the circuit board; and a high-frequency superimposition integrated circuit arranged on the other face of the circuit board, the high-frequency superimposition integrated circuit including a high-frequency signal generation circuit, the circuit board having an area greater than or equal to an area occupied by a lead pin of the laser diode and a region smaller than or equal to twice a region where the laser diode is mounted, a high-frequency signal generated from the high-frequency signal generation circuit being superimposed on a driving signal to be supplied to the laser diode, in order to take a measure against noise caused by return light of the laser diode. | 08-18-2011 |
20110235498 | OPTICAL DISK DEVICE AND POWER SUPPLY METHOD - According to one embodiment, an optical disk device includes types of semiconductor laser diodes configured to emit laser light of different wavelengths, an output control circuit configured to control light output of each semiconductor laser diode, and a composite power source configured to generate voltages required for driving the types of semiconductor laser diodes and operating the output control circuit from a single power source voltage and to selectively output the generated voltages. The composite power source includes an input port to input an external control signal at a time of voltage selection and is configured to change the output voltage stepwise in response to the control signal. | 09-29-2011 |
20120275290 | LASER DIODE WRITE DRIVER - A laser diode write driver is described. This laser diode write driver comprises: a feedback loop coupled for receiving an input current signal, the feedback loop operative for reaching a steady state and comprising a Class AB driver in series with a Class A driver, wherein the feedback loop transmits a first current signal; a current mirror adapted to receive the first current signal, the current mirror operative for replicating the first current signal and transmitting a second current signal; a differential device adapted to receive the second current signal, the differential device operative for steering current in at least one direction and transmitting a first voltage signal; a second class AB driver adapted to receive the first voltage signal and transmit a first drive signal, a second Class A driver adapted to receive the first drive signal and transmit a second drive signal; and an output device coupled to the second drive signal and operative for transmitting a driver output signal that drives the light source in response to receiving the second drive signal. | 11-01-2012 |
20130021893 | Optical Pickup Apparatus - An optical-pickup apparatus configured to prevent noise caused by return light by superposing a high-frequency signal, generated from a high-frequency signal generation circuit, on a driving signal to be supplied to a laser diode, the optical-pickup apparatus includes: a high-frequency superimposition integrated circuit including the high-frequency signal generation circuit; first wiring connected between an anode of the laser diode and the high-frequency superimposition integrated circuit; and second wiring connected between a cathode of the laser diode and the high-frequency-superimposition integrated circuit, the laser diode and the high-frequency superimposition integrated circuit mounted on a circuit board, the first wiring and the second wiring arranged, for the most part, in a region where the laser diode is arranged, the second wiring configured to pass through between an anode terminal of the laser diode and an anode terminal of a monitor diode. | 01-24-2013 |