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| Number | Title | Issue Date |
| 7359308 | Fixing structure for optical element and optical head device A fixing structure for an optical element includes a first element face of the optical element, a second element face of the optical element which is orthogonal to the first element face, a first positioning plane of a fixed member which abuts with the first element... | 04/15/2008 |
| 7345982 | Optical pickup device, optical disk drive, optical device and composite optical element An optical pickup device is provided which includes a double-wavelength objective lens (34) that collects a light beam selectively emitted from a light-emitting/-detecting element (31) that selectively emits a plurality of light beams different in wave... | 03/18/2008 |
| 7342868 | Compatible optical pickup apparatus A compatible optical pickup apparatus and method are provided. The apparatus and method include a first light source for generating and emitting a first light having a predetermined wavelength, a second light source for generating and emitting a second light having ... | 03/11/2008 |
| 7184386 | Integrated type optical head with sheet waveguide and light coupler An integrated optical head is provided. In the integrated optical head, a light source emits light. A waveguide guides the light. An input coupler is located at one edge of the waveguide, and couples light emitted from the light source and transmits the coupled ligh... | 02/27/2007 |
| 7065009 | Optical information storage apparatus and optical device including a beam splitting surface with a convex surface side and a concave surface side There is disclosed a small lightweight optical information storage apparatus which can obtain a sufficient writing light quantity, and an optical device which can realize the optical information storage apparatus. The optical device for use in the optical informatio... | 06/20/2006 |
| 6961297 | Optical head device The present invention provides for a optical head device having a beam-guiding optical device to bring beams of different wavelengths which are emitted by separate light sources together onto the same optical axis or to guide the beams onto a common photo receiving ... | 11/01/2005 |
| 6847499 | Optical head and method of adjusting optical path thereof An optical head includes a substrate, a laser diode, a photodetector, an objective lens, a prism, and an optical element. The laser diode is installed on the substrate and emits light. The photodetector is installed on the substrate and receives the light. The objec... | 01/25/2005 |
| 6845077 | Optical pick-up device with convergent light diffraction for recording/reading information on optical recording medium An optical pick-up device for recording/reading an optical recording medium is provided, which can efficiently utilize light emitted from the laser light source. The optical pick-up device includes a light source, an optical system, a quarter-wave plate, a diffracti... | 01/18/2005 |
| 6714370 | Write head and method for recording information on a data storage medium A recording head for use in conjunction with a magnetic storage medium, comprises a waveguide for providing a path for transmitting radiant energy, a near-field coupling structure positioned in the waveguide and including a plurality of arms, each having a planar se... | 03/30/2004 |
| 6639887 | Optical apparatus with laser light receiver and focus error generator in the same layer An optical integrated apparatus is used in an optical pickup apparatus which irradiates a light emitted by a light emitting device to an optical information record medium, on which record information is recorded, and receives a reflection light reflected ... | 10/28/2003 |
| 6614825 | Monolithic VCSEL-based optical pickup and servo control device A VCSEL-based monolithic optical pickup system for use with optical recording media with a retaining member, a plurality of VCSELs disposed on the retaining member for emitting laser beams, a plurality of detectors disposed on the retaining member for rec... | 09/02/2003 |
| 6510119 | Optical head device A light source (1) is composed of a single element having a light emitting point (2S) emitting a light (3S) and a light emitting point (2L) emitting a light (3L) at a longer wavelength than the light (3S), the light emitting point (2S) and the light emitt... | 01/21/2003 |
| 6496453 | Optical pickup An optical pickup has a light source that emits a light beam having a far field pattern being elliptical in cross section; a collimator lens that converts the light beam from the light source into a substantially parallel light beam; a beam shaping element tha... | 12/17/2002 |
| 6483786 | Light guide path element and optical pickup A light guide path element is provided with: a first light guide path for guiding a light beam having a first wavelength; a second light guide path for guiding a light beam having a second wavelength; a first separating device for irradiating the light be... | 11/19/2002 |
| 6430138 | Bifocal optical pickup head A bifocal optical pickup head is disclosed for use in a optical pickup apparatus having a single objective lens, for generating two different focuses (bifocus) to access a compact disc (CD) and a digital versatile disc (DVD), which the thickness is differ... | 08/06/2002 |
| 6212153 | High NA solid catadioptric focusing device having a flat kinoform phase profile A magneto-optical head using a catadioptric focusing device comprised of an incident surface, a bottom reflective surface, a pedestal, and a body. The incident surface is generally flat and is comprised of a central diffractive, optically transmissive fac... | 04/03/2001 |
| 5732060 | Optical pickup and optical recording medium reproducing apparatus having a wire grid unit An optical pickup and an optical recording medium reproducing apparatus smaller and more reliable than conventional optical pickups and optical recording medium reproducing apparatuses. These are provided with a one-dimensional metal grid which is formed ... | 03/24/1998 |
| 5726962 | Compact optical pickup device with beam splitter The optical pickup device according to the present invention, includes: a light emitting diode for emitting a light beam; a collimating lens for collimating the light beam; an objective lens for focusing the collimated light beam from the collimating lens... | 03/10/1998 |
| 5712841 | Optical unit having a radiation source, a detector and a grating, and scanning device including the optical unit An optical unit includes a first holder with a radiation source, a second holder with a radiation-sensitive detector, a grating, and a mirror. The unit further includes a cylindrical mounting having a cylinder axis and a wall oriented transversely to the ... | 01/27/1998 |
| 5703861 | Integrated confocal optical pick-up head with a hologram and a polarizer mounted on each side of a transparent heat sink Light is emitted from a light-emitting element toward an irradiated medium, and returning light reflected by the irradiated medium is diffracted by a hologram device. A polarizer polarizes the light diffracted by the hologram device to produce first polar... | 12/30/1997 |
| 5659531 | Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein An optical head device uses a birefringent diffraction grating polarizer configured in a reflection type. The device includes a polarizing hologram element which reflects the light from a light source to a converging lens system and diffracts the polarize... | 08/19/1997 |
| 5627806 | Optical head having beam splitting surface curved to present a substantially uniform angle An optical head for recording and reproducing information on and from an opto-magnetic record medium by projecting a light beam onto the record medium and introducing a return light beam reflected by the record medium onto photodetectors, including a ligh... | 05/06/1997 |
| 5621716 | Optical pickup having a transparent lens member with two reflecting surfaces An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, th... | 04/15/1997 |
| 5608708 | Optical beam-splitting element A one-piece element for splitting part of the radiation of an incident beam, to form a sub-beam having a different direction. The element includes a mirror for reflecting the sub-beam at an increased angle with respect to the direction of the incident bea... | 03/04/1997 |
| 5566157 | Optical pickup for information recording/reproducing apparatus having polygon prism, hologram, and grating lens An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, th... | 10/15/1996 |
| 5481515 | Optical information storage medium control apparatus An optical pickup device includes a laser source for emitting linearly polarized light; an objective lens for focusing source light received from the laser source on an optical information storage medium; a photodetector for receiving signal light reflect... | 01/02/1996 |
| 5481516 | Optical disk pickup device including waveguide with separate integrated grating couplers for laser output, focus, and tracking error signals An optical pickup device for an optical disk includes a semiconductor laser, an optical waveguide for propagating the laser beam, at output grating coupler for focusing the propagated beam through the optical waveguide onto one point of a optical disk, an... | 01/02/1996 |
| 5465247 | Optical head An optical head for recording and reproducing information on and from an opto-magnetic record medium by projecting a light beam onto the record medium and introducing a return light beam reflected by the record medium onto photodetectors, including a ligh... | 11/07/1995 |
| 5453962 | Focus error detecting device A focus error detecting device includes a reflected beam splitter and at least two two-division photodetectors. The reflected beam splitter includes a diffraction grating part and a non-diffraction grating part separated by a line dividing a reflected bea... | 09/26/1995 |
| 5422870 | Optical pickup for information recording/reproducing apparatus An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, th... | 06/06/1995 |
| 5317551 | Optical disk head including a light path having a thickness and width greater than the light beam wavelength by a predetermined amount An optical disk head which includes a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of 10 times greater than the wavelength, a light source optically connected to the light path so as to allow ... | 05/31/1994 |
| 5278817 | Optical pick-up for use with an opto-magnetic signal An optomagnetic information recording and reproducing apparatus includes an optomagnetic optical pick-up for recording or reproducing information on or from an optomagnetic information recording disc. An optomagnetic optical pick-up includes a first diffr... | 01/11/1994 |
| 5200939 | Optical head apparatus including a waveguide layer with concentric or spiral periodic structure An optical head arranged in such a manner that light emitted from a semiconductor laser (8) is inputted and coupled in a waveguide layer (3C) by a grating coupler (4C) having a concentric or spiral structure formed by concavities and convexities so as to ... | 04/06/1993 |
| 5172368 | Reader for optical recording medium A device for reading an optical recording medium which includes a source (1) for emitting a first light beam (F1) along a main optical axis (01); a beam splitter (2) to direct, along the main optical axis, the first light beam towards the surface of the r... | 12/15/1992 |
| 5164930 | Optical pickup An optical pickup is used to optically read recorded information on an optical information storage medium such as a compact disk in a compact disk player, for example. The optical pickup has a beam splitter having a first facet for reflecting a laser beam... | 11/17/1992 |
| 5161148 | Optical pick-up using wavelength guide with grating coupler therein An optical pick-up for an optical disk has a semiconductor laser having an optical axis for generating a laser beam. An objective lens focuses the laser beam onto an optical disk disposed in the path of the optical axis of the semiconductor laser. A wavel... | 11/03/1992 |
| 5153860 | Optical pickup apparatus for detecting and correcting focusing and tracking errors in detected recorded signals A pickup apparatus for a magneto-optical recording medium comprises a waveguide for receiving a light beam reflected by a magneto-optical recording medium, and first and second focusing grating couplers disposed side by side on the waveguide for introduci... | 10/06/1992 |
| 5105403 | Optical information reading apparatus with waveguide and diffraction grating An art for reading information from an optical recording disk by means of a light beam emitted from a semiconductor laser, particularly an optical integrated circuit type apparatus which is improved to suppress fluctuation of the focal point of the beam c... | 04/14/1992 |
| 5060212 | Integrated optical pick-up device An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or... | 10/22/1991 |
| 5051974 | Optical head device having a light splitter with a diffraction grating structure An optical head device comprises a light source, a light splitter for reflecting a light emitted from the light source by a first plane thereof to direct the light to an information carrier and transmitting the light from the information carrier through t... | 09/24/1991 |
