166results about How to "Stable reproduction" patented technology

In a read/write device for writing and reading a storage medium by way of a heat assisted magnetic recording/reproduction scheme, the read/write device including an elevated slider provided with a semiconductor laser, provided is a heat dissipation mechanism for dissipating heat generated in the elevated slider to an outside of a housing of the read/write device. Further, the storage medium has a second heatsink layer formed of an Al film having a thickness of 50 μm, a backing layer, a heat barrier layer, a first heatsink layer, a magnetic recording layer, and a protection film on a glass substrate. With this arrangement, in a read/write device which performs a heat assisted magnetic recording and reproduction by a semiconductor laser provided on the elevated slider, the occurrence of malfunction due to temperature rises in the storage medium is prevented.

There is provided an apparatus and method for initializing a tap coefficient of an adaptive equalizer constituting a read path for a storage medium, where the apparatus includes an FIR filter, a Viterbi decoder, a level error detector, and a tap coefficient updater, the FIR filter receives a first signal stream and outputs the first signal stream in the form of a second signal stream, the Viterbi decoder corrects a bit error of the second signal stream, the level error detector detects a level error between the second signal stream and a third signal stream that is an ideal output signal corresponding to the second signal stream, the tap coefficient updater selects a tap coefficient minimizing the level error and provides the selected tap coefficient as a tap coefficient of the FIR filter, the tap coefficient minimizing the level error is determined as an initial value in a system initialization mode, and the determined initial value is used as an initial value of the tap coefficient of the FIR filter in a normal operation mode.

In a three-dimensional recording and reproducing apparatus having a recording medium including a plurality of recording layers stacked on a substrate and an optical system for converging a light irradiated from the substrate side on each of the plurality of recording layers to three-dimensionally record and reproduce information, the following equation is satisfied:

λ/4≦(1/8NB)(1/NB²−1)NAF⁴Δd

where

• • λ: Wavelength of the light;
  • NB: Refractivity of the substrate 3;
  • NAF: Numerical aperture of a focus lens 8 for converging a light;
  • Δd: Positional range in the optical axis direction in which exists a recording layer on which the light is to be converged.

A light spot is focused on each layer of the multi-layer structured disc to record and reproduce highly reliable data in a high density.

A microecological water quality conditioning agent applicable to restoring of sea cucumber culture water body and a method for preparing the microecological water quality conditioning agent belong to the technical field of aquaculture and microorganisms. By aiming at physiological habits and culturing characteristics of sea cucumbers and applying modern biological technique, the microecological water quality conditioning agent is made of bacillus flexus CGMCC (China general microbiological culture collection center) No.5115, bacillus subtilis CGMCC No.5116 and bacillus cereus CGMCC No.5117, which are separated and sieved from a sea cucumber culturing environment and prepared by steps: using corn starch and soybean cake powder as main culturing materials, fermentating for 24-48h at 25-40 DEG C, and using zeolite and wheat bran as adsorption carriers for processing to obtain the microecological water quality conditioning agent. The microecological water quality conditioning agent is less susceptible to environment conditions, has remarkable purifying effect on sea cucumber culturing water body, and is capable of greatly reducing content of harmful substances such as ammonia nitrogen, nitrite, hydrogen sulfide and the like, deodorizing and effectively restraining pathogenic bacteria so as to prevent sea cucumber diseases and improve yield and quality of cultured sea cucumbers.

When a projection plane is not uniform due to colors and patterns on the projection plane and ambient environmental light, a reproduced image projected by a projector is made to appear in desired colors. A color correcting apparatus is used, comprising association unit (21), association storage memory 22, color information acquisition unit (23), color conversion calculation unit (23), color conversion storage memory (25), and color correction unit (26). Association unit (21) acquires captured image (7) generated by capturing image (5) projected onto projection plane (2) to establish an association between pixels of image (5) and pixels of captured image (7). Association storage memory (22) records the association. Color information acquisition unit (23) acquires second color information as color information for each pixel of the captured image. Color conversion calculation unit (23) calculates a color conversion for each pixel of the image based on first color information, second color information, and the association. Color conversion storage memory (25) records the color conversion. Color correction unit (26) corrects the input image for colors on a pixel-by-pixel basis using the color conversion.

A Mach-Zehnder interferometer type optical modulator includes a first end facet and a reflecting portion opposing the first end facet; a single optical coupler including input and output ports, the optical coupler being disposed between the first end facet and the reflecting portion; first and second optical waveguides that are connected to the input ports of the optical coupler; third and fourth optical waveguides that are connected to the output ports of the optical coupler; and a phase shifting section disposed between the optical coupler and the reflecting portion. The phase shifting section includes a first optical waveguide structure constituting part of the third optical waveguide; a first upper electrode on the first optical waveguide structure; a second optical waveguide structure constituting part of the fourth optical waveguide; and a second upper electrode on the second optical waveguide structure.

A voice coil assembly capable of realizing a flat thin loudspeaker having a high efficiency, reduced divided vibrations, a flat frequency response, and reduced operation defects. The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and defining a rectangular space therein and an internal rectangular coil fixed to an inner wall surface of the rectangular bobbin defining the rectangular space, wherein an outer wall surface of the rectangular bobbin of one internal-winding voice coil is adhered and fixed to an outer wall surface of the rectangular bobbin of another internal-winding voice coil.

An imaging device according to the present invention includes a registration unit, an imaging unit, a searching unit, and a color adjustment unit. The registration unit registers a reference subject. The imaging unit shoots a subject and outputs image data. The searching unit searches a specific area matching with the reference subject from an image area of the image data. The color adjustment unit performs color adjustment such that color information of the specific area approximates to the color information of the registered reference subject.

A hologram record carrier has a substrate and a reflective layer, wherein recording or reproducing of information is performed by light irradiation. The hologram record carrier further comprises a holographic recording layer that reserves an optical interference pattern comprising components of coherent reference light and signal light as a diffractive grating therein, and a two-dimensional recording layer that is laminated in a film thickness direction of the holographic recording layer and whose physical property changes in response to light intensity.

The present invention relates to an optical head device and an optical disk unit using the same. The optical head device includes a relay lens control unit to control at least one of lenses of a relay lens unit based on an output signal outputted from a first optical detector and a power control circuit to control an intensity of a light beam emits from a light source.

A voice coil assembly capable of realizing a flat thin loudspeaker having a high efficiency, reduced divided vibrations, a flat frequency response, and reduced operation defects. The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and defining a rectangular space therein and an internal rectangular coil fixed to an inner wall surface of the rectangular bobbin defining the rectangular space, wherein an outer wall surface of the rectangular bobbin of one internal-winding voice coil is adhered and fixed to an outer wall surface of the rectangular bobbin of another internal-winding voice coil.

A hologram device includes: a support section that keeps hold of, to be able to be attachable and removable, a hologram record carrier including a hologram recording layer stored therein with an optical interference pattern of a coherent signal light and a coherent reference light as a diffraction grating; a light source that generates the coherent reference light; a signal light generation section that is disposed on an optical axis, and generates the signal light by modulating the reference light in accordance with recording information; and an interference section that is disposed on the optical axis, and forms the diffraction grating being the optical interference pattern inside of the hologram recording layer by directing the signal light and the reference light toward the hologram recording layer. The signal light generation section is provided with a spatial light modulator, and the spatial light modulator is configured by a center are a disposed on the optical axis for passing through or reflecting the reference light with no modulation, and a spatial light modulation are a disposed around the center are a for generating the signal light by modulating the reference light in accordance with the recording information. The reference light is propagated on the optical axis, and the signal light is propagated around the reference light with spatial separation therefrom. The interference section includes an objective lens and an optical device, and the objective lens and the optical device gather the reference light at a first focal point, and the signal light at a second focal point being different from the first focal point.

An optical head apparatus is provided with a first laser element, a second laser element and a polarized beam splitter. The first laser element emits a laser beam having a first wavelength. The second laser element emits a laser beam having a second wavelength. The second wavelength may be equivalent to the first wavelength, alternatively, it may be different from the first wavelength. The polarized beam splitter enables the laser beams of the first and second laser elements to be simultaneously radiated to the recording layer of an optical disk. When information are recorded in the optical disk, the laser beams of the first and second laser elements are used at the same time. At least one of the laser elements emits a laser beam having such a wavelength as enables the recording layer of the optical disk to absorb the largest possible amount of energy.

An optical information recording medium is provided with a plurality of information layers (2, 3), each of which has a sector structure in which a data area (8, 12) is divided in the circumferential direction by a sector address (9, 13). The positions of the sector addresses (9, 13) of the respective information layers (2, 3) coincide in the circumferential direction. This can prevent errors during reproduction caused by the effect of other information layers and stabilize recording characteristics, resulting in an increased recording capacity of a rewritable recording medium having a plurality of information layers with a sector structure.

A metal pipe corrosion monitoring device includes a steam introduction unit for introducing thereinto steam flowing through a metal pipe; and a corrosion testing unit provided in the steam introduction unit, characterized in that the steam introduction unit is configured to generate condensed water by condensing some of the steam to create a simulated environment similar to an actual environment in the metal pipe and discharge the condensed water above a predetermined water level to the outside. The corrosion testing unit has one or more contact members that contact with a water line region around a water surface of the condensed water in the steam introduction unit, a water phase region on a condensed water side and a vapor phase region on a steam side, and is configured to be able to measure an electric resistance of the one or more contact members.

An optical recording and reproduction medium in which pits corresponding to recording information are formed along a recording track, wherein auxiliary pits are formed in at least a portion of the spaces between adjacent pits along the recording track direction; when the pit depth is d1 and the auxiliary pit depth is d2, then d1≧d2 is obtained; and both edges of the auxiliary pits along the recording track direction are shaped as simple convex curves.

A design is made for recording and arrangement of application data so as to stably control the behavior of moving picture data based on application data and easily achieve special reproduction of moving picture data. Therefore, moving picture data encoded in a preset format is multiplexed with application data used to control the behavior of a reproduced picture of the moving picture data. Further, the basic process is provided to deal with a first file which contains a multiplexed stream separated by preset units and a second file containing the same data as the application data.

Each track is made up of a linkage of regions, and each of the regions is made up of a linkage of nodes or clusters. Sound data are stored on a cluster-by-cluster basis, and reproduced by tracing such linkages. Each time editing is performed on a virtual track of the track, a track data of a corresponding leading region in the edited virtual track is stored in memory as a history record of the track. When an undoing instruction is given, desired record data is selected from the history records of the leading region. Where the sound data in the trailing-end cluster of a preceding region and leading-end cluster of a succeeding region amount to less than 50% of a predetermined total data quantity of sound data to be contained in a proper cluster, the sound data represented by a trailing-end offset and the sound data represented by a leading-end offset are combined together and then written into a reproducing cluster. In reproduction, the sound data written in the reproducing cluster are reproduced for a connecting portion between the preceding and succeeding regions.

Stable recording and reproduction of data onto and from a recording medium that requires precise tracking is provided by using a simple head tracking mechanism. In a hard disk drive (200), a piece of sector data to be written or read is pre-associated with a sector number of a sector where the piece of sector data is to be written or read. A seek control unit (260) corrects first-order run-out relative to a revolution axis of a DTM magnetic disk (100) and permits second-and-higher order run-out relative to the revolution axis, and moves a read/write head (122, 124) gradually in one radial direction of the DTM magnetic disk at a shift pitch smaller than the track pitch for each revolution in accordance with the sector numbers of the sectors where pieces of sector data are to be written or read, within a range of tracks containing the sector numbers of the sectors where the pieces of sector data are to be written or read. A recording/reproducing unit (266, 268) writes or reads, in accordance with a present sector number of a sector where the write/read head is located, a corresponding piece of sector data onto or from the DTM magnetic disk, independently of the order of the sector numbers.

An optical disk apparatus includes a rotary driving unit rotating an optical disk which is flexible, an optical pickup irradiating light upon a recording surface of the optical disk on which writing/reading of information is performed, a stabilizing unit stabilizing vibration of the optical disk in a rotary axial direction by using pressure difference of air flow at least on a portion where writing/reading is performed, and being disposed on a side of the optical disk opposite to a side on which the recording surface is provided, and a control-adjustment unit analyzing a value of a tracking error signal of the optical disk obtained by scanning along a groove of the optical disk with use of the optical pickup, comparing the analyzed value of the tracking error signal of the optical disk and a value priorly obtained by scanning along a groove of a standard disk prepared beforehand, and adjusting a positional relation between the optical disk and the stabilizing member in a three dimensional space according to the result of the comparison.