| Patent Number |
Title Of Patent |
Date Issued |
| RE37428 |
Magneto-optical disk system with specified thickness for protective layer on the disk relative t |
October 30, 2001 |
| A magneto-optical disc system includes a magneto-optical disc with a light transmitting protective layer, an objective lens for bundling or focusing a laser beam onto a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic |
| 7547868 |
Optical near-field generating apparatus and method and information recording and reproducing app |
June 16, 2009 |
| An optical near-field generating apparatus includes a conductive scatterer causing an optical near-field based on a surface plasmon to be generated by being illuminated by incident light, and a conductive body arranged in a vicinity of the scatterer and generating a surface plasmon by be |
| 7454771 |
Optical recording medium and disc cartridge |
November 18, 2008 |
| An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam |
| 7420892 |
Optical head device, and optical recording/reproducing device |
September 2, 2008 |
| A compact and light flying head type magneto-optical head apparatus is provided. The magneto-optical head apparatus (1) of the present invention comprises a suspension (12) whose one end is fixed to a lower surface of an arm (11), a slider (13) fixed to a free end of the suspension (12), |
| 7403464 |
Lens and combination lens |
July 22, 2008 |
| A lens and combination lens able to suppress deviation of an optical axis of a lens occurring at the time of combination and able to be adjusted at a high precision, a method of producing the combination lens, and an optical pickup device and an optical disk drive mounting the combinatio |
| 7305689 |
Optical recording medium and disc cartridge |
December 4, 2007 |
| An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam |
| 7256950 |
Optical device, optical system, method of production of same, and mold for production of same |
August 14, 2007 |
| A first optical device according to the present invention comprises a base made of a first optical material and a second optical material having a refractive index different from that of the first optical material, and the base has a concavity, and the second optical material is filled i |
| 7064906 |
Optical pickup device with shielding to limit incident or emitted light |
June 20, 2006 |
| An optical pickup device and optical disc apparatus of the present invention include an optical element that prevents the incidence of light on unnecessary portions of the optical element so that stray light and noise are eliminated. The optical element include at least one substrate |
| 6992842 |
Optical device, optical system, method of production of same, and mold for production of same |
January 31, 2006 |
| A first optical device according to the present invention comprises a base made of a first optical material and a second optical material having a refractive index different from that of the first optical material, and the base has a concavity, and the second optical material is filled i |
| 6985310 |
Optical device, optical system, method of production of same, and mold for production of same |
January 10, 2006 |
| A first optical device according to the present invention comprises a base made of a first optical material and a second optical material having a refractive index different from that of the first optical material, and the base has a concavity, and the second optical material is filled i |
| 6972912 |
Optical device, optical system, method of production of same, and mold for production of same |
December 6, 2005 |
| A first optical device according to the present invention comprises a base made of a first optical material and a second optical material having a refractive index different from that of the first optical material, and the base has a concavity, and the second optical material is filled i |
| 6966707 |
Optical pickup |
November 22, 2005 |
| An optical pickup using an optical fiber module which includes optical fibers is provided, which can be small-sized and utilize a light beam from a light source at high efficiency.The optical pickup includes: an optical fiber module 20, in which an optical fiber 10 consists of: a first o |
| 6898027 |
Optical element and manufacturing method for same |
May 24, 2005 |
| An optical element and manufacturing method of the present invention prevent the incidence of light on unnecessary portions of the optical element so that stray light and noise are eliminated. The optical element is configured from at least one substrate having a plurality of lens su |
| 6896419 |
Optical pickup |
May 24, 2005 |
| An optical pickup using an optical fiber module which includes optical fibers is provided, which can be small-sized and utilize a light beam from a light source at high efficiency. The optical pickup includes: an optical fiber module 20, in which an optical fiber 10 consists of: a first |
| 6825995 |
Optical device, optical system, method of production of same, and mold for production of same |
November 30, 2004 |
| A first optical device according to the present invention comprises a base made of a first optical material and a second optical material having a refractive index different from that of the first optical material, and the base has a concavity, and the second optical material is filled i |
| 6785222 |
Read-only optical recording medium and disc cartridge |
August 31, 2004 |
| An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam |
| 6747943 |
Optical recording medium and disc cartridge |
June 8, 2004 |
| An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam |
| 6717738 |
Optical element, metal mold for producing optical element and production method for optical elem |
April 6, 2004 |
| An approximately rectangular parallelopiped shaped optical element 100 has a substrate (base) 101, a lens 102, and an axially symmetric convex portion 103D formed in an upper surface 100U of the substrate 101. The radius of curvature of the surface of this convex portion 103D is appr |
| 6704275 |
Optical recording medium and disc cartridge having 2 GB capacity |
March 9, 2004 |
| An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam |
| 6496450 |
Optical recording/reproducing apparatus, optical rotating recording medium, and method of design |
December 17, 2002 |
| An optical recording/reproducing apparatus accessing a recording layer of an optical rotating recording medium using an accessing means positioned a predetermined gap away from a surface of said optical rotating recording medium and mounted with an object lens, wherein a thickness of a |
| 6262948 |
Optical disk having a protective layer specified thickness relative to the NA of an objective le |
July 17, 2001 |
| An optical disc system uses an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The thickness of the light-transmitting cover |
| 6219308 |
Optical disk system having objective lens with a numerical aperture related to thickness of prot |
April 17, 2001 |
| Disclosed is a magneto-optical disc system comprising a magneto-optical disc 40 with a light-transmitting cover 41, an objective lens 2 for bundling or focusing a laser beam on a magnetic recording layer 43 of the magneto-optical disc 40 in order to perform recording and/or reproduction, |
| 6169714 |
Apparatus and method for recording/reproducing magneto-optical information |
January 2, 2001 |
| A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium at least including a first magnetic film having perpendicular magnetic anisotropy, and a second magnetic film to which information recorded on the first magnetic film is |
| 6075762 |
Disc drive apparatus |
June 13, 2000 |
| An optical pickup is provided with a main beam for performing recording or playback on a disc and an advance beam in a position ahead of this main beam to detect the surface state of the disc; the surface state of the disc is detected on the basis of the light reception information (an M |
| 6044043 |
Magneto-optical head capable of operation under inclination of the disc |
March 28, 2000 |
| A head unit is provided which is able to satisfactorily record/reproduce an information signal to and from a disk even if the disk can considerably be inclined (deflected) by a load applied by the head. The load applied from the magnetic head to the disk is set to be not larger than an u |
| 5914915 |
Magneto-optical disk system having an objective lens with a numerical aperture related to the th |
June 22, 1999 |
| An magneto-optical disc system includes an magneto-optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the magneto-optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the |
| 5910932 |
Optical disk and optical disk system with numerical aperture of objective lens related to protec |
June 8, 1999 |
| An optical disc system uses a rewritable optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The recording layer is formed of |
| 5838656 |
Optical disk system having an objective lens with a numerical aperture related to the thickness |
November 17, 1998 |
| A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting layer 41, an objective lens 2 for bundling or focusing a laser beam onto a magnetic recording layer 43 of the magneto-optical disc 40 for recording information thereon and/or reproducing informatio |
| 5838646 |
Optical disk having a protective layer of specified thickness relative to the numerical aperture |
November 17, 1998 |
| An optical disc system uses an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The thickness of the light-transmitting cover |
| 5784343 |
Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems |
July 21, 1998 |
| A magneto-optical recording and/or reproducing apparatus having a magnetic head and first and second optical systems for recording on and/or reproducing from first and second magneto-optical media. The first optical system has a first objective lens, and the second optical system has a |
| 5781518 |
Disc recording method wherein a segment is recorded with reference data to control the phase of |
July 14, 1998 |
| A method of recording data on a disc on a disc pre-recorded with servo control data, with the servo control data being pre-recorded in the form of convex and concave pits at intervals along substantially concentric tracks, the servo control data recorded in alignment in a diametrical |
| 5757733 |
Optical disc system having an objective lens with a numerical aperture related to the thickness |
May 26, 1998 |
| A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting cover layer 41, an objective lens 2 for bundling or focusing a laser beam onto a magnetic recording layer 43 of the magneto-optical disc 40 for recording information thereon and/or reproducing |
| 5648944 |
Recording/reproducing apparatus that utilizes the servo clock signals to form read and write clo |
July 15, 1997 |
| A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 64 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the d |
| 5627810 |
Recording/reproducing apparatus that forms read and write clock signals with differing frequenci |
May 6, 1997 |
| A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 86 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the d |
| 5617378 |
Magneto-optical disc system having an objective lens with a numerical aperture related to the th |
April 1, 1997 |
| An magneto-optical disc system includes an magneto-optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the magneto-optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the |
| 5610880 |
Optical disc system and optical disk therefor |
March 11, 1997 |
| An optical disc system using an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the light-transmitting cover is se |
| 5592465 |
Disc recording method |
January 7, 1997 |
| In a disc recording method in which a disc on which servo control data is recorded in advance in alignment with a radial direction is divided into a plurality of zones in the radial direction and digital data having different clock rates are recorded on every zone, reference data for |
| 5587990 |
Optical disc system and optical disc therefor |
December 24, 1996 |
| An optical disc system using an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the light-transmitting cover is se |
| 5559774 |
Optical disc reproducing apparatus which employs a binary detector for the outer tracks and a te |
September 24, 1996 |
| An apparatus reproducing signals recorded on an optical disc rotated at a constant angular velocity. The apparatus employs a binary detector for forming digital data by comparing the reproduced signal with a predetermined threshold level, and a ternary detector for forming reproduced |
| 5533001 |
Magneto-optical disk system with specified thickness for protective layer relative to the numeri |
July 2, 1996 |
| A magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field gen |
| 5515346 |
Magneto-optical disk system with specified thickness for protective layer relative to the numeri |
May 7, 1996 |
| A is a magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field |
| 5508981 |
Magneto-optical disk system with specified thickness for protective layer relative to the numeri |
April 16, 1996 |
| A magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field gen |
| 5495455 |
Magneto-optical disk recording and reading apparatus and method wherein the recording head is co |
February 27, 1996 |
| A magneto-optical disc recording apparatus includes a magnetic head, an optical head, a position detector and a controller. The magnetic head supplies a vertical magnetic field corresponding to recording data to a magneto-optical disc. The optical head emits a light beam to the magne |
| 5488590 |
Magneto-optical overwrite recording and reproducing system |
January 30, 1996 |
| A magneto-optical recording and reproducing system in a magneto-optical disk capable of being overwrite recorded by applying a magnetic field to a photo-sensitive recording layer and irradiating a laser beam onto the recording layer. A track pitch and a diameter of the laser beam are set |
| 5428583 |
Magneto-optical disc recording/reproducing apparatus |
June 27, 1995 |
| A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing. That is, the apparatus includ |
| 5414687 |
Disc recording/reproducing apparatus |
May 9, 1995 |
| A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 86 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the d |
| 5392263 |
Magneto-optical disk system with specified thickness for protective layer on the disk relative t |
February 21, 1995 |
| A magneto-optical disc system includes a magneto-optical disc with a light transmitting protective layer, an objective lens for bundling or focusing a laser beam onto a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic |
| 5329503 |
Magneto-optical disc recording/reproducing apparatus |
July 12, 1994 |
| A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing. That is, the apparatus includ |
| 5287334 |
Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus |
February 15, 1994 |
| A magneto-optical pickup apparatus includes an objective lens for focusing a laser beam emitted from a laser device onto a magneto-optical recording medium, driving coils, on which the objective lens is mounted, for driving the objective lens in focusing and tracking directions, and a pl |
| 5200935 |
Recording apparatus using magneto-optical effect including control means for inhibiting energizi |
April 6, 1993 |
| In a recording apparatus employing a magneto-optical effect, and in which a light beam irradiates a region of a magneto-optical disc while a magnetic field acts on the disc at such region and is modulated by coded data in accordance with a predetermined modulation system; the light beam |
