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| Number | Title | Issue Date |
| 6898028 | Optical device and optical reproducing apparatus An optical reproducing apparatus in which reproduction of information is carried out by using an optical record carrier. In order to compensate a radial tilt between the surface of the record carrier and the objective lens, the objective lens is tilted. In the optic... | 05/24/2005 |
| 6898157 | Optical head having a plurality of coil elements connected in parallel to each other A coil assembly includes a coil arranged around a vertical axis, and a supporting member for carrying the coil. The supporting member is formed with a through hole corresponding to the vertical axis. The coil includes a plurality of coil elements which are connected... | 05/24/2005 |
| 6885625 | Near-field optical storage medium and optical data storage system therefor An optical data storage system writes or reads information with respect to an optical storage medium using an optical pickup including a solid immersion optical system or a solid immersion lens for generating a near-field and emitting a light beam. The optical stora... | 04/26/2005 |
| 6882614 | Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses A recording/reproducing apparatus having an optical pickup device which is efficient in light use having little spherical aberration. The recording and/or reproducing apparatus includes an optical pickup having an objective lens, disposed opposite a disk, having a l... | 04/19/2005 |
| 6876502 | Optical system and optical pickup apparatus therewith An optical pickup apparatus is capable of recording data in and/or reproducing data from recording mediums with different formats by using one single optical system. The optical pickup apparatus includes an optical system, wherein a filtering surface that transmits ... | 04/05/2005 |
| 6862259 | Optical lens, optical pickup apparatus, and optical disk apparatus using the same Providing an objective lens capable of achieving reliable centering during formation, allowing high-precision formation, and improving durability of a manufacturing apparatus, and providing an optical pickup apparatus and an optical disk apparatus using that objecti... | 03/01/2005 |
| 6857125 | Contact member to optical disk, protecting film for optical disk and coating composition A coating comprising a urethane resin as a base, and at least polyurethane particles and fluororesin powder is formed on a surface of a member that is, or can be, contacted with an optical disk in an optical disk apparatus. The coating can prevent the optical disk, ... | 02/15/2005 |
| 6850476 | Optical recording medium An optical recording medium includes recording tracks located adjacently to each other and is provided on and/or from which information is recorded and/or reproduced by irradiating with a beam a predetermined track of those recording tracks. The track pitch between ... | 02/01/2005 |
| 6845078 | Optical pickup apparatus An optical pickup apparatus comprises a first light source for emitting a first laser beam having a first wavelength; a second light source for emitting a second laser beam having a second wavelength; and an objective lens for condensing the first laser beam and the... | 01/18/2005 |
| 6839313 | Information recording and reproducing apparatus An information recording and reproducing apparatus for optically recording/reproducing information to/from a two-layer optical disk comprises a cylindrical lens, which gives astigmatism to a reflected light from a target information recording layer, two caustic curv... | 01/04/2005 |
| 6839315 | Optical head and optical pickup having improved thermal coefficient matching for thermal expansion adjustment An optical head, able to reduce thermal stress generated in an optical lens mounted on a bobbin, having a bobbin formed with a center hole and an optical lens mounted on the bobbin via a thermal expansion adjustment member 40 formed with an opening. The optic... | 01/04/2005 |
| 6836459 | Optical pickup device An optical pickup device for irradiating a disk type data recording medium with a laser beam emitted from a light source, comprises: an object lens comprising a transparent piezoelectric element that deforms when a voltage is applied, and condensing the laser beam e... | 12/28/2004 |
| 6836378 | Objective lens design method, lens, and optical system, optical head, and optical disc apparatus using the same When the DVD provided with the DVD substrate 2 having thickness t2 of 0.6 mm is installed in the optical disc apparatus, the light beam 4 having wavelength λ1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be co... | 12/28/2004 |
| 6831790 | Optical element, method for producing the same, and optical pickup An optical element having a substrate formed by an optical material and able to improve mechanical strength, wherein the substrate has a convex part functioning as a convex lens, a flat part positioned around the convex part, and an outer circumference part position... | 12/14/2004 |
| 6829209 | OBJECTIVE FOR OPTICAL DISK, OPTICAL HEAD DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS BOTH COMPRISING THE SAME, MOLD FOR FORMING LENS, METHOD FOR MACHINING MOLD FOR FORMING LENS, AND SHAPE MEASURING INSTRUMENT An objective lens for an optical disk including one lens and capable of satisfying an excellent focusing property on any of two kinds of optical disks each having a different thickness. The objective lens (2) is formed of a single lens having aspheric surface... | 12/07/2004 |
| 6819504 | High NA objective lens for optical pick-up A single-element objective lens for an optical pick-up directs an incident light beam to a data recording surface of an optical disc through a cover layer to form a beam spot thereon. A numerical aperture of the objective lens is 0.7 or more. The objective lens is c... | 11/16/2004 |
| 6819647 | Optical information processor and optical element An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. T... | 11/16/2004 |
| 6816449 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the optical pickup apparatus including two laser light sources to emit light b... | 11/09/2004 |
| 6813095 | Optical image pick-up lens An optical image pick-up lens is formed from crescent-shaped first and second lenses that may be aspherical molded glass lenses or aspherical plastic lenses. A convex surface at a first side of the first lens faces toward an object, and a convex surface at a second ... | 11/02/2004 |
| 6813234 | Optical pickup device and method of adjusting the same Disclosed herein is an optical pickup device and method of adjusting the same. The optical pickup device and method of adjusting the same of the present invention can correct aberrations due to variation of thickness of an optical disc and dispersion of the emission... | 11/02/2004 |
| 6809886 | Method for manufacturing a combined solid immersion lens (SIL) and submicron aperture, and device thereof The invention relates to an integrated method for manufacturing a combined solid immersion lens (SIL) and submicron aperture, and device thereof, comprising depositing a sacrificial layer on a substrate, coating a photoresist on the sacrificial layer and using photo... | 10/26/2004 |
| 6807018 | Objective lens for optical pick-up An objective lens of an optical pick-up is formed to provide axial astigmatism corresponding to wavefront aberration of 0.01λ [rms] or more when a shorter wavelength laser beam emitted by a first laser diode is converged on a first optical disc, and to provide coma... | 10/19/2004 |
| 6798733 | Optical recording method and medium When information is recorded in an optical recording medium having a recording layer by irradiating a laser beam thereto through an optical system, the recording is carried out under the conditions: λ/NA≦680 nm and n·Tw≦22 ns wherein the laser beam has a wavel... | 09/28/2004 |
| 6795254 | Objective lens for optical pickup and optical pickup employing this objective lens The present invention is concerned with an objective lens for an optical pickup, which is made up by a single lens of a meniscus structure, and which includes, looking sequentially from a light source side, a first surface S1 formed by an aspherical surfa... | 09/21/2004 |
| 6791932 | Optical system of optical pick-up An optical system of an optical pick-up that is capable of using thin cover type and thick cover type optical discs. The system includes a light source portion for emitting a short wavelength laser beam for the thin cover type optical disc and a long wavelength lase... | 09/14/2004 |
| 6791763 | Molded coupling lens A molded coupling lens, for use in an optical pickup apparatus, comprises: a first surface including a first optical surface, a second surface located opposite to the first surface and including a second optical surface, and a flat surface section provided substanti... | 09/14/2004 |
| 6791934 | Objective lens optical system, optical head and optical information reproduction apparatus When it is intended to realize a lens having a large NA with one lens, an adjustment precision between both surfaces of the lens is very strict. Accordingly an objective lens having an NA of 0.8 or more was usually realized by two lenses. However, a working distance... | 09/14/2004 |
| 6788636 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the optical pickup apparatus including two laser light sources to emit light b... | 09/07/2004 |
| 6788637 | Apparatus for reading from and/or writing to optical recording media An apparatus for reading from and/or writing to optical recording media on which data markings are arranged along tracks arranged next to one another. The apparatus according to the present invention comprises a light source, a focusing means and an intensity distri... | 09/07/2004 |
| 6785215 | Astigmatic objective lens for optical head An objective lens for an optical head converges a first laser beam having a relatively short wavelength and a second laser beam having a relatively long wavelength on first optical disc (DVD) and a second optical disc (CD), respectively. A protective layer of the fi... | 08/31/2004 |
| 6785203 | Optical lens for optical disc drive with aberration suppression for recording/reproducing for a plurality of optical disc types An objective lens converges a shorter wavelength laser beam on a DVD having a protective layer, which is 0.6 mm thick, and a longer wavelength laser beam on a CD having a protective layer, which is 1.2 mm thick. A common region is defined on the objective lens. The ... | 08/31/2004 |
| 6781771 | Objective lens for optical recording medium and optical pickup device using it An objective lens and optical pickup device that uses it is disclosed having an optical diffraction surface on its surface nearest a light source which may be switched in wavelength for either CD or DVD recording/replaying. The optical diffraction surface causes a s... | 08/24/2004 |
| 6781928 | Optical head and optical disk apparatus There are comprised a laser light source for outputting a light beam, an optical disk having a recording/reproducing surface and a transparent substrate on the surface, an objective lens for gathering the light beam on the optical disk, a relay lens system comprisin... | 08/24/2004 |
| 6781946 | Optical pickup apparatus and disk drive apparatus An optical pickup apparatus for recording and/or reading a signal to and from a signal recording layer of an optical disk by applying a light beam to the signal recording layer is provided to prevent a collision between the optical disk and an objective lens, and pr... | 08/24/2004 |
| 6781945 | Optical head and optical disc apparatus for focusing a collimated laser beam An optical head includes a laser source (11) irradiating the laser beam having a wavelength not longer than 500 nm, a collimator lens (13) for collimating the laser beam to the parallel rays, an optical beam shaping system (14, 15) that adjusts ... | 08/24/2004 |
| 6781764 | Objective lens for optical pick-up An optical system of an optical pick-up includes a light source portion that selectively emits a first laser beam (shorter wavelength) and a second laser beam (longer wavelength), and an objective lens for converging the first laser beam onto a first optical disc an... | 08/24/2004 |
| 6771583 | Optical component In an optical lens used for a passing light having the maximum intensity on a wavelength (λT) of 780±10 nm, an optical is made such that a reflection preventing coating is provided on both or at least one of a light-incident surface (S1) and a li... | 08/03/2004 |
| 6771584 | Optical disk, aberration correction method and optical disk apparatus The invention provides an optical disk wherein a spherical aberration caused by a displacement of the thickness of a transparent substrate of the optical disk can be corrected without giving rise to an increase in scale of the apparatus or an increase of the cost. T... | 08/03/2004 |
| 6762978 | Optical head slider, method for manufacturing optical head slider, and recording and/or reproducing apparatus Recording/reproducing information signals to/from a recording medium appropriately even though the clearance from the signal recording surface of the recording medium to an optical head slider becomes significantly small. An optical head slider 10 includes a ... | 07/13/2004 |
| 6760294 | Optical pickup device Light emitted from a semiconductor laser is converted by a collimator lens into a collimated light, which enters into an objective lens of high NA and forms a condensed spot within an optical disk. The light emitted from the semiconductor laser is S-polarized light ... | 07/06/2004 |
