Class / Patent application number | Description | Number of patent applications / Date published |
369112020 | Crystal (e.g., liquid, elasto-optic, photo-refractive, etc.) | 18 |
20080205241 | Optical Head With Switchable Diameter of the Radiation Spot on the Radiation Detector - In an optical scanning device ( | 08-28-2008 |
20080205242 | Multi-Radiation Beam Optical Scanning Device - An optical scanning device ( | 08-28-2008 |
20080239925 | Compact Switchable Optical Unit - A switchable optical unit, capable of controlling a beam of radiation (b) passing through an optically active portion ( | 10-02-2008 |
20080253262 | Multi Layer Variable Refractive Index Unit - A variable refractive index unit ( | 10-16-2008 |
20080291808 | Optical pickup device - An optical pickup device includes: a light source; an objective lens which condenses a light beam that is emitted from the light source on a recording layer of an optical recording medium; and a photo detector which receives reflected light that is reflected by the optical recording medium. Further on an optical path between the light source and the objective lens, a liquid lens which performs correction of spherical aberration by changing state of convergence or divergence of the input light beam and a liquid crystal element on which a plurality of phase shift regions are formed to adjust phase of the input light beam, and which performs correction of the spherical aberration by phase adjustment of the phase shift regions are arranged. | 11-27-2008 |
20090016194 | Optical Pickup Device - An optical pickup device includes a first light source emitting first light with a first wavelength, a second light source emitting second light with a second wavelength, a third light source emitting third light with a third wavelength, an objective lens having a step structure, the objective lens being disposed to satisfy predetermined conditions, at least one first coupling lens making the first light and the second light incident onto the objective lens as converged light, a second coupling lens making the third light incident onto the objective lens as diverging light, and a liquid crystal aberration correcting element. | 01-15-2009 |
20090022035 | SPHERICAL ABERRATION CORRECTION CONTROL - A controller and a control method is provided to control a spherical aberration correcting device provided in an optical pick-up head to change a spherical aberration compensate value according to different controlling states during the spherical aberration correcting device changes the spherical aberration compensate value. For the mechanical type spherical aberration correcting device, the controlling states are the different speeds for the actuators to drive the lenses. For the liquid crystal type spherical aberration correcting device, the controlling states are the control values for the driver to drive liquid crystal spherical aberration corrector. | 01-22-2009 |
20090028034 | TEMPERATURE CONTROL APPARATUS FOR OPTICAL CRYSTAL - A temperature control apparatus for optical crystal can employ a general temperature control element as is, can be controlled by a single temperature sensor and is applicable to patterns that produce complex temperature distributions. This temperature control apparatus has an optical crystal ( | 01-29-2009 |
20090238061 | OPTICAL PICKUP APPARATUS AND OPTICAL INFORMATION RECORDING REPRODUCING APPARATUS - A structure according to the present invention is an optical pickup apparatus including a first light source, a second light source, a third light source, a first objective optical system, a second objective optical system, an incidence optical system for emitting the first to third light fluxes into the first objective optical system or the second objective optical system, and an optical detector. The optical pickup apparatus converges a light flux emitted from the first light source onto an information recording surface of a first optical information recording medium or a second optical information recording medium, by using the first objective optical system. The optical pickup apparatus converges a light flux emitted from the second light source onto an information recording surface of a third optical information recording medium by using the second objective optical system, and further converges a light flux emitted from the third light source onto an information recording surface of a fourth optical information recording medium by using the second objective optical system. The first objective optical system includes an objective lens, and a liquid crystal correcting element being adopted to correct the amount of spherical aberration for a light flux passing through the liquid crystal correcting element. | 09-24-2009 |
20090296559 | OPTICAL SCANNING DEVICE - An optical scanning device for scanning optical record carriers having cover layers of different thicknesses. The scanning device has a first mode for scanning a first optical record carrier, a second mode for scanning a second optical record carrier and a third mode for scanning third optical record carrier. The device comprises an objective lens system and a switchable optical element having a first discrete state and a different, second discrete state. The element comprises: a fluid system including a first fluid and a different, second fluid ( | 12-03-2009 |
20100061216 | OPTICAL HEAD UNIT AND OPTCAL INFORMATION RECORDING/REPRODUCING APPARATUS - An optical head unit includes, apart from an objective lens toward a light source, an optical device that changes the image height of light incident onto the objective lens, wherein the optical device includes a concave lens and a convex lens. The objective lens is designed so that a coma aberration having a specific polarity occurs if the optical axis of the incident light tilts toward a specific direction. If the disk tilts, the convex lens is moved within the plane perpendicular to the optical axis, to change the image height of the light incident onto the objective lens, to thereby tilt the optical axis of light exiting from the convex lens with respect to the optical axis of light incident onto the concave lens. The objective lens generates a coma aberration having a polarity opposite to the polarity of the coma aberration attributable to the tilt of disk, to thereby cancel the coma aberration attributable to the tilt. | 03-11-2010 |
20100149950 | LIQUID CRYSTAL OPTICAL MODULATION ELEMENT AND OPTICAL HEAD DEVICE - To provide a liquid crystal optical modulation element which is excellent in durability against blue laser and which can maintain the characteristics for a long period of time. | 06-17-2010 |
20100260030 | LIQUID CRYSTAL ELEMENT, OPTICAL HEAD DEVICE, AND VARIABLE OPTICAL MODULATION ELEMENT - A liquid crystal element includes: a transparent substrate; and a liquid crystal layer including: a liquid crystal material; and a concavo-convex portion including periodic concaves and convexes, wherein the concavo-convex portion is aligned so that a longitudinal direction of liquid crystal molecules that are positioned on a side of the transparent substrate and on a concavo-convex surface that is an interface of the concavo-convex portion substantially becomes a vertical direction with respect to a concavo-convex surface on the side of the transparent substrate, or a longitudinal direction of liquid crystal molecules that are positioned on a side, in which a medium is disposed and which is opposite to the transparent substrate, and on the concavo-convex surface that is the interface of the concavo-convex portion substantially becomes the vertical direction with respect to a concavo-convex surface on the side, in which the medium is disposed, to form a diffraction grating. | 10-14-2010 |
20110134742 | PICKUP APPARATUS, OPTICAL RECORDING AND REPRODUCTION APPARATUS, AND RECORDING AND REPRODUCTION METHOD - A pickup apparatus includes a light source; a light separator; an object lens that concentrates the light which penetrated the light separator on the optical recording medium; a movable lens; and a light sensing element that receives the reflected light from the optical recording medium separated by the light separator, wherein a coma aberration generated by the transverse shift of the object lens is corrected by a coma aberration which is generated by the deviation of a spherical aberration generated in an optical path from the light source to the object lens and a spherical aberration generated in an optical path from the object lens to a light concentration position on the optical recording medium which are due to the transverse shift. | 06-09-2011 |
20110149711 | COMA ABERRATION COMPENSATING DEVICE, COMA ABERRATION COMPENSATING METHOD, AND OPTICAL DISC - A method for compensating the coma aberration in a pickup of a recording and reproducing device that records or reproduces data on or from an optical disc using the pickup is provided. The method includes a first coma aberration compensating step to compensate coma aberration in a body of an optical system including an objective lens for emitting a light beam to an optical disc including a plurality of recording layers and a second coma aberration compensating step to compensate coma aberration caused by relative inclination of the optical system with respect to the optical disc. | 06-23-2011 |
20110235494 | Optical Pickup Apparatus - An optical pickup apparatus includes: a laser diode configured to generate a laser beam; and an objective lens having an annular diffraction zone formed on an incident surface thereof on which the laser beam is incident, the annular diffraction zone being a zone configured to focus the laser beam on each of signal recording layers of first to third optical discs so that a signal recorded in each of the signal recording layers of the first to third optical discs are read, the first optical disc having the signal recording layer at a first distance from a surface thereof, the second optical disc having the signal recording layer at a second distance longer than the first distance from a surface thereof, the third optical disc having the signal recording layer at a third distance longer than the first distance and shorter than the second distance from a surface thereof. | 09-29-2011 |
20120075977 | OPTICAL INFORMATION RECORDING/ REPRODUCING APPARATUS AND OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD - An optical information recording/reproducing device includes a liquid optical element containing a liquid crystal polymer layer in an optical head. A liquid crystal optical element drive unit drives a liquid crystal optical element having a first pattern electrode divided into a plurality of region at one side of the liquid crystal polymer layer in the optical axis direction. The first pattern electrode includes a first region arranged to surround the optical axis and second to ninth regions arranged outside the first regions in such a manner that the circumference is divided eight portions. The liquid crystal optical element drive unit applies an effective voltage to each region. The voltage applied to the respective regions of the pattern region of the liquid crystal optical element is decided in a short time so as to optimize the quality of the reproduction signal. | 03-29-2012 |
20130163399 | LIQUID CRYSTAL ALIGNMENT FILM, PROCESS FOR ITS PRODUCTION, OPTICAL ELEMENT USING THE LIQUID CRYSTAL ALIGNMENT FILM, AND OPTICAL INFORMATION WRITING/READING DEVICE - To provide a liquid crystal alignment film having a sufficient alignment-regulating power and high resistance against blue laser beam and having, at the same time, excellent adhesion, and an optical element using it. A liquid crystal alignment film obtainable by bonding, by chemisorption to a substrate, an alignment-regulating precursor which undergoes anisotropic decomposition by irradiation with polarized ultraviolet light, and irradiating the alignment-regulating precursor bonded to the substrate, with polarized ultraviolet light, to let it undergo anisotropic decomposition and exhibit an alignment-regulating power. | 06-27-2013 |