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8178010 |
Optical device and method of producing the same
An optical device having a sub-wavelength grating formed in a specified region is disclosed that is able to prevent wave front degradation accompanying a phase difference of a polarized light beam...
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8169876 |
Optical information recording method, optical information reproducing method, optical information recording apparatus and optical information reproducing apparatus
An optical information recording method of recording information three-dimensionally by irradiating a laser light beam onto a medium having a servo information plane on which address information...
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8169879 |
Optical recording system to record information with light
A multilayer optical recording system to record information with light includes a lens unit, a recording medium, and a microscopic drive unit. The lens unit includes a metamaterial lens or a...
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8130621 |
Optical head device and optical disk playback system
A recording and reproducing device that is capable of improving its reproduction quality by efficiently detecting a reproduction signal having small low frequency noises even when reproducing data...
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8111602 |
Objective lens, optical pickup device, and optical disk drive
Provided are an optical pickup apparatus and an objective lens which can record and/or reproduce information for discs with different recording densities and can realize simplification of the...
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8098562 |
Objective lens comprising a diffraction structure for distributing light in to light of different diffraction orders, optical pickup device, and optical information recording or reproduction apparatus having same
An objective lens includes a diffraction structure for distributing much of a quantity of an incident light beam into two diffracted lights having different diffraction orders from each other,...
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8085626 |
Optical pickup device and lens for optical pickup
An optical pickup device according to the present invention comprises: a first mirror for reflecting a first light beam outputted from a first light source and letting a second light beam outputted...
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8072867 |
Optical pickup
An optical-pickup hologram element has six regions on an x-y plane, divided as follows: the first region with a first line (an x-axis) and a second line that connects points (−xa, 0) and (−xb, yb)...
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8064315 |
Condensing optical device, optical pickup, and optical disc apparatus
An optical pickup includes: a first emission unit emitting an optical beam with a first wavelength corresponding to a first optical disc; a second emission unit emitting an optical beam with a...
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8045432 |
Optical disc device
Light emitted from a radiation light source 1 passes through a diffraction grating 3a and is separated into transmitted light a and +1st/−1st order diffracted lights b, c. These lights are c...
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8045443 |
Optical pickup apparatus
An optical pickup apparatus comprising: a laser-light source that selectively emits first and second laser lights parallel with each other; a diffraction grating that includes a plurality of...
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8004953 |
Optical pick-up and disc apparatus having the same
An optical pick-up and a disc apparatus having the same. The inferiority of a tracking signal caused by an adjacent layer during the recording and/or reproducing of an optical disc with multiple...
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8000188 |
Optical pickup apparatus and optical disc apparatus including the same
An optical pickup apparatus comprising at least: a diffraction grating configured to split first wavelength light into at least a first main beam and first sub-beam, and to split second wavelength...
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7995433 |
Optical head apparatus and optical disc apparatus
In an optical head apparatus and an optical disc apparatus which can reduce influence of interlayer stray light on a differential push-pull signal without making the configuration complicated,...
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7990832 |
Optical pickup including plural light sources and recording and/or reproducing apparatus for an optical recording medium
The present invention provides an optical pickup in which the transmission diffraction efficiency of plural recording and/or reproducing light beams of different wavelengths, radiated from plural...
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7990833 |
Optical pickup device with diffraction patterns on object lens
An optical pickup device, which reduces the size of an optical spot formed on an optical disk, and prevents the degradation of a tracking error signal due to coherent light from a layer adjacent a...
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7990834 |
Optical pickup device recording and/or reproducing information on and/or from a plurality of kinds of recording media
An optical pickup device has a semiconductor laser emitting light which is in turn branched via a diffraction grating into at least three beams of light including a main beam and two sub beams...
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7986605 |
Optical pickup and optical disc apparatus using the same
An optical pickup includes a light source emitting a light beam, an objective lens condensing the light beam emitted from the light source onto an optical disc, at least one divergent angle...
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7974172 |
Optical pickup apparatus
An optical-pickup apparatus comprising: a laser-light source; a diffraction grating including first-and-second regions of periodic structures different in phase from each other and a third region...
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7969850 |
Optical element, optical pickup device comprising the same, and unnecessary light elimination method
The optical element comprises a first diffraction structure for generating three beams by diffracting light from a light source and a second diffraction structure that exhibits structural...
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7965609 |
Optical pickup device and optical recording medium information reproduction device
The present invention provides an optical pickup device and optical recording medium information reproduction device that are capable of reproducing information that is recorded on a plurality of...
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7961583 |
Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
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7957231 |
Optical pickup apparatus and objective optical element
A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the...
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7948854 |
Optical head apparatus and optical information recording/reproducing apparatus
An optical head apparatus of an optical information recording/reproducing apparatus is provided with a light source. An objective lens focuses an output light emitted by said light source on a disc...
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7940631 |
Optical pickup device
An optical pickup device includes a diffraction grating 12 for separating an emitted light beam into at least three light beams. The diffraction grating 12 is divided into three regions by dividing...
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7929399 |
Optical pickup device and optical disc device
When recording on and/or reproducing from an information recording medium having a plurality of recording layers is performed, there has been a problem in appropriately detecting a control signal...
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7924681 |
Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
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7920456 |
Objective lens for optical pickup device, optical pickup device and optical information recording/reproducing apparatus
An objective lens used for an optical pickup device wherein the optical pickup device includes: light source; and a converging optical system including the objective lens for converging a light...
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7898922 |
Optical pickup apparatus
An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low-density recording medium, a second objective lens having a high NA suitable for a...
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7889617 |
Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
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7876659 |
Optical pickup and optical drive
An optical pickup including a two-wavelength multilaser for generating a tracking error signal and a focusing error signal with high accuracy without light quantity variations which otherwise might...
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7859976 |
Optical pickup device
In a photo pickup device, an incident area 30 for a reflection light of a light spot is divided into four areas 30a˜30d by parting lines 31, 32 making axial-symmetrical angles with a direction Y ...
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7848208 |
Optical head device, aberration correction method and optical information processing apparatus
An optical head device is provided with a semiconductor laser, an aberration correcting element for transmitting a beam from the semiconductor laser, a light guiding portion for introducing the...
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7848207 |
Optical pickup
An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light...
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7839733 |
Optical device and optical disc apparatus utilizing the optical device
A signal, which is derived from the relationship between the lens shift amount of an objective lens and the amount of the positional-deviation, of a received light beam with respect to a...
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7839754 |
Optical head and optical disk device
An optical head includes a first laser diode configured to generate a laser beam with a wave length of λ1, a second laser diode configured to generate a laser beam with a shorter wave length of ...
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7835250 |
Optical pickup device and information recording/reproduction device
The present invention makes it possible to accurately and adequately adjust the position where sub beams are shone when performing tracking correction or CTC using three beams. The invention...
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7835235 |
Optical pickup apparatus and optical recording/reproducing system using the same
An optical pickup apparatus and an optical recording/reproducing system including the same, the optical pickup apparatus includes at least two optical systems for different types of optical...
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7792005 |
Optical pickup apparatus
On an optical path between a light source and an objective lens, there is provided an optical path changing section for changing a predetermined optical path of undesired light passing through,...
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7782737 |
Optical integrated unit and optical pickup apparatus including the same
An optical integrated unit of the present invention includes: a semiconductor laser that is a light source; at least one light receiving element; a light dividing section which divides outgoing...
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7782736 |
Optical pickup for a disk apparatus
An optical pickup includes: a frame, having a first face formed with a groove, a second face opposite to the first face, a first hole in which a diffraction grating is disposed, and a second hole...
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7773490 |
Optical compensator for use in an optical scanning device
An optical compensator is included in an optical scanning device for scanning optical record carriers. There are at least two different information layer depths within two different carriers. The...
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7768881 |
Medium, apparatus, and method of recording optical-information
An optical-information recording medium includes a substrate that includes a servo surface having a servo pattern thereon; an information recording layer laminated on the servo surface of the...
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7755991 |
Method for detecting radial tilt of optical recording medium in optical head device, optical head device, and optical information recording/reproducing device
The light emitted from a semiconductor laser is divided by a diffractive optical element into three light beams which are 0th-order light as the main beam and ±1st-order diffracted lights as the ...
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7729228 |
Optical pickup and optical disc apparatus
An optical pickup which includes first to third light sources each emitting a light beam each having a first to third wavelength; an objective lens condensing each of the light beams emitted from...
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7729227 |
Diffractive element, method of manufacturing the same, optical pickup device, and optical disc apparatus
There is provided a diffractive element including a first member 2, which includes a first resin 2a and has a predetermined refractive index, and a second member 3, which has the same refractive...
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7724634 |
Optical pickup apparatus with temperature compensation
An optical pickup apparatus, comprising: a light source to emit a light flux; a light converging system including an objective lens to converge the light flux emitted from said light source onto an...
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7719948 |
Lens unit for optical pick-up apparatus and optical pick-up apparatus
The lens unit for the optical pick-up apparatus has: the objective lens by which the projecting light from the light source is condensed on the information recording surface of the optical...
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7719949 |
Optical head
An optical head includes a blue color laser beam sources, a red color laser beam sources, a dichroic prism, a collimator lens, a beam splitter, an objective lens, a photo detector element, a...
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7715299 |
Objective optical system, optical pickup apparatus and optical information recording/reproducing apparatus with diffraction structure and optical path difference-generating structure
The objective optical system of the present invention includes a first diffraction structure that applies diffraction to the light fluxes of wavelength λ1, wavelength λ2 and wavelength λ3 so th...
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