Patent application number | Description | Published |
20140036648 | OPTICAL DISC DEVICE - Disclosed is an optical disc device that provides a stable servo signal with a simple configuration during the use of an objective lens showing significant color aberration. At time T | 02-06-2014 |
20140043952 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - An optical information recording/reproducing apparatus, to apply holograms of an angle multiplex recording method therein includes: a light source to emit a light beam; a divider unit to divide the light beam into a signal beam and a reference light; an angle variable unit to change an angle of the reference light incident upon an optical information recording medium; a spatial light modulator unit to add information to the signal beam; an objective lens to irradiate the signal beam on the medium; an image pickup unit to detect a diffracted light generating from a recording region, when the reference light is irradiated on the medium; and an optical element to shape a form of light flux of the reference light, so that a light flux diameter of the reference light in a multiplex direction becomes larger than the light flux diameter of the reference light in a pitch direction. | 02-13-2014 |
20140301177 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD - An optical information recording/reproducing apparatus for recording an interference pattern between signal light and reference light information-multiplexed as a hologram in an optical information recording medium and for reproducing information recorded in the optical information recording medium on the basis of the recorded hologram with use of the reference light. The apparatus includes a light source for emitting light and a coherency controller for controlling a coherency of the light source. The apparatus controls the coherency controller in such a manner as to switch between a coherency required in a recording mode and a coherency required in a reproducing mode. | 10-09-2014 |
20150131424 | OPTICAL INFORMATION RECORDING/REPRODUCTION DEVICE, RECORDING CONDITION ADJUSTMENT METHOD, AND OPTICAL INFORMATION RECORDING MEDIUM - An optical information recording/reproduction device appropriately adjusting a recording condition and a method and a medium therefor are provided in order to cope with a problem that the signal-to-noise ratio (SNR) during reproduction decreases, unless the condition during recording is adjusted, because of variation in the environment during recording, variation of components such as laser output, variation of production of the device, and the like in the optical information recording/reproduction device using holography. In an optical information recording/reproduction device configured to record or reproduce information to an optical information recording medium by using holography, a recording condition is adjusted, before user data are recorded, in an adjustment area provided for recording condition adjustment in an optical information recording medium. | 05-14-2015 |
20150294682 | OPTICAL INFORMATION APPARATUS - In order to correct signal-to-noise ratio degradation caused by a position error of an aperture filter relative to a signal beam and ensure a high recording signal quality in an optical information apparatus using holography, an optical detection system capable of conducting position adjustment of the aperture filter by using the signal beam is provided and the aperture filter is positioned with high precision. | 10-15-2015 |
20150318009 | OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD - An optical information recording and reproducing device that records information on a recording medium and/or reproduces information on the recording medium, using holography is configured to include a laser light source that performs irradiation with laser light, a first light-shielding portion which is capable of switching between transmission and shielding of laser light emitted from the laser light source, and a driving circuit that drives the switching between transmission and shielding of the first light-shielding portion, and a first movement portion that moves the first light-shielding portion. | 11-05-2015 |
20160041525 | HOLOGRAPHIC MEMORY DEVICE - To reduce an influence of stray light and stably record/reproduce high-quality data in holographic recording/reproduction. A holographic memory device includes an optical system that guides a reference beam to an optical information recording medium at a desired angle of incidence, a control part that controls the angle of incidence of the reference beam generated in the optical system, and a lens part that images the reference beam in a desired position of the optical information recording medium. Further, at least a first light beam at a first angle and a second light beam at a second angle different from the first angle are output from the optical element, and the optical element is provided so that the first light beam may propagate within an effective diameter of the lens part and the second light beam may propagate to an outside of the effective diameter of the lens part. | 02-11-2016 |
20160055875 | HOLOGRAM RECORDING AND REPRODUCING DEVICE, AND ANGULAR MULTIPLEXING RECORDING AND REPRODUCING METHOD - A hologram recording and reproducing device and an angular multiplexing recording and reproducing method capable of detecting an angular error signal for which, in a two-beam angle multiplexing method, high-speed reproducing can be achieved with a superior recovered signal. A branch element branches a light beam, emitted from a light source, into a signal light and a reference light. Angle-variable elements modify the incident angle of the reference light that is incident to the optical information recording medium. A spatial light modulator adds information to the signal light; and an objective lens radiates the signal light to the optical information recording medium. An imaging element detects diffracted light generated from a recording region when the reference light is radiated upon the optical information recording medium; a detection system detects at least two angular error signals for controlling the angle-variable elements; and switching is performed between the two angular error signals. | 02-25-2016 |
20160086628 | Optical Component Positioning Device and Optical Recording Device Using Same - Diffracted light generated by a recording medium in reproduction is largely blocked by a spatial filter because of a position shift of the recording medium. Thus, the light amount of the diffracted light converged onto an optical detector is reduced and a satisfactory level of a reproducing signal cannot be obtained. In addition, in recording, it is necessary to fix the position of the spatial filter in rays for removing unnecessary frequency components or the like in a light beam emitted from a light source. In actuators having at least two spatial filters, one spatial filter is mounted on an actuator driven along two or more axes and moves independently of another spatial filter, and the other spatial filter is fixed to a common one-axis actuator. Switching of the positions of the spatial filters is performed by the common one-axis actuator. | 03-24-2016 |
20160111123 | OPTICAL INFORMATION RECORDING/REPRODUCTION DEVICE AND ADJUSTMENT METHOD - The optical information recording/reproduction device for recording information by irradiating an optical information recording medium with signal light and reference light to form a hologram, and reproducing the information by irradiating the hologram with the reference light, wherein the optical information recording/reproduction device is provided with a branching element for branching laser light from a laser light source into signal light and reference light, a spatial light modulation unit for adding two-dimensional information to the signal light, an objective lens for irradiating an optical information recording medium with the signal light, a photodetector for detecting diffracted light from the optical information recording medium when irradiated with the reference light, and an optical axis adjustment unit disposed between the laser light source and the branching element, the optical axis adjustment unit adjusting the optical axis of the laser light. | 04-21-2016 |