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| Number | Title | Issue Date |
| 7435934 | Optical pickup apparatus which is compatible with multiple types of media 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 high density recording medium, a first light source that emits short... | 10/14/2008 |
| 7336432 | Optical pickup and optical disc device An optical pickup includes at least a laser light source emitting a laser beam, a collimator lens system including a plurality of lenses for collimating the light beam emitted from the laser light source and incident thereupon as diffused light, and an objective len... | 02/26/2008 |
| 7321542 | Beam shaping prism and optical pickup employing the same A beam shaping prism used in an optical pickup, the beam shaping prism includes a first prism having an incident surface and a second prism having an inclined surface. Since a beam entering the beam shaping prism makes right angles with a beam emerging therefrom, it... | 01/22/2008 |
| 7301872 | Optical pickup and optical disc drive device The present invention relates to an optical pickup and an optical disc drive that records or reproduces data signals on or from optical discs different in specifications, such as recording density and thickness. One objective lens (17) is used for optical dis... | 11/27/2007 |
| 7215476 | Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus Laser beams respectively emitted from a SHG blue laser unit and a red semiconductor laser unit that have photo detectors respectively are turned into parallel lights by a collimator lens and then coupled by a dielectric multi-layer film mirror so as to be propagated... | 05/08/2007 |
| 7154837 | Optical pickup and optical information recording/reproducing device An optical pickup and an optical information recording/reproducing device are provided, each of which is capable of forming a super-resolution spot to conduct micro-mark recording, and does not undergo signal degradation due to an increased sidelobe in a reproducing... | 12/26/2006 |
| 7149383 | Optical system with reduced back reflection An optical system is adapted to produce reduced back reflection from a receiving detector back to a light source for increased system performance. The system may optically condition light signals from the light source for projection onto the detector. The conditioni... | 12/12/2006 |
| 7119953 | Phase contrast microscope for short wavelength radiation and imaging method A phase contrast x-ray microscope has a phase plate that is placed in proximity of and attached rigidly to the objective to form a composite optic. This enables easier initial and long-term maintenance of alignment of the microscope. In one example, they are fabrica... | 10/10/2006 |
| 7072118 | Optical element and manufacturing method of the optical element An optical element having an optical axis, comprises an element body having the maximum first length of 4 mm or less in the optical axis direction and the second maximum length of 6 mm or less in the direction perpendicular to the optical axis direction; wherein the... | 07/04/2006 |
| 6967908 | Optical pickup device with focus error detecting optical element and method for focus error detection An optical pickup device for focusing a light beam includes a focus error detecting optical element which splits and leads return light to a photodetector. The focus error detecting element has an area quadrisected by two division lines defining a plane substantiall... | 11/22/2005 |
| 6940802 | Optical scanning device with an actuator coil bent around the beam path An optical scanning device scans an information track which is present on an information carrier. The scanning device includes a radiation source, a lens system with an optical axis for focusing a radiation beam supplied by the radiation source into a scanning spot ... | 09/06/2005 |
| 6930973 | Optical element An optical element (16) introduces a first wavefront deviation when a first radiation beam having a first wavelength passes through it and a second wavefront deviation when a second radiation beam having a second wavelength different from the first wavelength... | 08/16/2005 |
| 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 |
| 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 |
| 6661765 | Optical pickup apparatus A laser beam emitted from a laser source provided at a silicon substrate passes through a hologram element formed of a translucent flat plate and a grating, thereby being subjected to NA conversion executed by an NA converting lens, passing through a pola... | 12/09/2003 |
| 6510011 | Optical scanning device The invention relates to an objective system (39) which is suitable for use in an optical scanning device (15). The lens system (39) comprises a first lens, or objective lens (45), and a second lens, or auxiliary lens (47), which are mounted in fixed posi... | 01/21/2003 |
| 6504812 | Optical pickup device with a plurality of laser couplers An optical pickup device with the capability to read data from and write data to different kinds of optical discs in different formats and a composite optical device used in the optical pickup device. An optical pickup device is made by combining two lase... | 01/07/2003 |
| 6496465 | Monolithic CD/DVD read/write head A read head optical system capable of reading either CD or DVD disks is provided. A monolithic molded hollow plastic block includes three lenses integrally molded into its exterior surfaces. A 780 nm laser diode is aligned with the first lens for reading ... | 12/17/2002 |
| 6490100 | Objective lens and optical head device An objective lens (1) for an optical disk, which focuses a light beam from a light source, is designed so that a third-order coma aberration generated when the objective lens is inclined at a unit angle is larger than a third-order coma aberration generat... | 12/03/2002 |
| 6487026 | Optical lens system comprising two more than half-spherical lenses An optical lens system including: a first lens including a more than half part of a substantially spherical first lens body having a first diameter and a substantially flat first boundary surface; a second lens including a more than half part of a substan... | 11/26/2002 |
| 6411587 | Optical pickup optical system, optical pickup apparatus, coupling optical system, coupling optical system lens and recording/reproduction apparatus An optical pickup apparatus for recording and/or reproducing information on an optical information recording medium includes a light source emitting a light flux, a light-converging optical system to converge a light flux emitted from the light source, ha... | 06/25/2002 |
| 6272097 | Optical head and apparatus for recording and reproducing optical information through the use of the optical head A minute optical head is provided so that a light source and one or more photo detector elements are integrated on the same substrate by a simple manufacturing process and may be applied to an apparatus for recording and reproducing recordable optical inf... | 08/07/2001 |
| 6205108 | Optical head for reproducing or recording a compact or similar disk An optical head of the present invention applicable to an optical disk drive includes a light-transmitting phase shifting device. The phase shifting device reduces aberration ascribable to a difference in the thickness of the substrate of an optical disk.... | 03/20/2001 |
| 5953294 | Optical pickup apparatus Disclosed is an optical pickup apparatus being manufactured with ease and utilizing the intensity of a laser beam effectively. The optical pickup apparatus comprises a polygonal prism having an upper surface, an incline surface, and a bottom surface. A la... | 09/14/1999 |
| 5793735 | Wavefront aberration compensation in an optical data recording and reproducing apparatus with crystal liquid matrix A wavefront aberration compensating apparatus for an optical data recording and reproducing apparatus to correct a wavefront aberration of light emitted from a light source and converged onto a data recording medium through an image forming optical system... | 08/11/1998 |
| 5790501 | Information reproducing device A laser beam emitted from a laser diode passes through a polarizing separating plane of a first polarization beam splitter and forms a beam spot on a magneto-optic disk. The plane of polarization of the laser beam that is reflected at a magnetic film prov... | 08/04/1998 |
| 5784354 | Optical pickup device To focus a beam irradiated from a laser light source on optical discs with different densities, objective lens part has first and second objective lenses integrally disposed from side to side of each other and parallel with the optical disc. A beam splitt... | 07/21/1998 |
| 5777971 | Optical head with a micro fresnel lens integrated on a beam splitter Disclosed is an optical pickup having simplified constitution. A light source for radiating laser beam for reading an optical disc is comprised. A beam splitter for separating the laser beam radiated from the light source into transmitting light and refle... | 07/07/1998 |
| 5740147 | Phase compensation of optical elements by tilting a half wave plate in a magneto-optic disk head A laser beam emitted from a laser diode passes through a first polarization beam splitter to form a spot on a magnetic film of a magneto-optic disk. The plane of polarization of the laser beam reflected at the magneto-optic disk rotates, due to the Kerr e... | 04/14/1998 |
| 5673247 | Optical pickup having two objective lenses An optical pickup for irradiating a first recording medium and a second recording medium with light, at least one of the substrate thickness and the refractive index of the first recording medium being different from that of the second recording medium, w... | 09/30/1997 |
| 5657306 | Optical pick-up head having polarizing beam splitter An optical pick-up head for reading information recorded on an opto-magnetic record medium including a laser light source emitting a linearly polarized beam, a beam splitter for transmitting a part of the laser beam, and an objective lens for projecting t... | 08/12/1997 |
| 5652745 | Optical system using polarized light with prevention of effect of birefringence An optical system using polarized light is provided wherein a polarized light beam from an optical source is made to coincide with the natural polarization of the optical element acting upon the light beam. The polarization of the light beam from the opti... | 07/29/1997 |
| 5615199 | Optical head apparatus An optical head apparatus for recording and reproducing data to and from optical disks, the apparatus boosting recording density by use of an objective lens with a higher numerical aperture (NA) than ever. A phase plate is added to the pupil position of t... | 03/25/1997 |
| 5615186 | Multiple data surface data storage system with holographic filter element An optical data storage system comprises a multiple data surface medium and optical head, The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are located on the substrate surfaces which lie adjacent a lig... | 03/25/1997 |
| 5600614 | Optical head system having super resolution element An optical head system for detecting information recorded on an optical recording medium is provided. In one preferred embodiment, the optical head system has a super resolution element includes a polarization phase shift plate positioned between a 1/4 wa... | 02/04/1997 |
| 5598394 | Optical pick-up An optical pick-up comprising a laser source (laser diode), a plurality of optical elements, beam splitter, focusing means (microlens) and detecting means (photo diode) is disclosed. The plurality of optical elements focuses a laser beam which is emitted ... | 01/28/1997 |
| 5579298 | Optical scanner having symmetry about an oblique divider A device for optically scanning an information plane (2) having tracks (5). Radiation supplied by a radiation source (7) is focused on the information plane by an objective system (8). The beam reflected by the information plane is incident on a dividing ... | 11/26/1996 |
| 5559783 | An optical head having a rotating mirror An optical head device for irradiating a light beam onto a recording medium to optically reproduce information recorded on the recording medium, the device includes a light source for generating a light beam to project onto the recording medium, a detecto... | 09/24/1996 |
| 5557597 | Focus error detector A focus error detector for detecting a signal representing a degree of a focus error of an objective lens with respect to an optical disk includes two focusing lenses each for focusing the reflected light of the optical disk by splitting the reflected lig... | 09/17/1996 |
| 5553052 | Inclination of an objective lens in an optical information system A detecting apparatus which detects an inclination of an objective lens relative to a reference surface is provided. The objective lens is part of an optical data recording and reproducing apparatus in which data is optically recorded on and reproduced fr... | 09/03/1996 |
