Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8059514 | Optical disc comprising a watermark and a method and recorder for recording such a disc A visible pattern is obtained by modulating the digital sum value. Because the digital sum value modulation allows the choice of several different channel bits groups between DC control points, the selection of a group of channel bits resulting in a change of reflec... | 11/15/2011 |
| 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 whose periodic structure is different in phase from the first-and-seco... | 07/05/2011 |
| 7372801 | Reproduction-only optical disc and method of recording and/or reproducing data on and/or from the same A reproduction-only optical disc has a lead-in area, a user data area, and a lead-out area. Disc related information recorded on at least one of the lead-in area and the lead-out area is recorded by high frequency groove wobbles, and data of the user data area is re... | 05/13/2008 |
| 7345987 | Optical disc which stores digital information in informational units which diffract a line of laser light at one of 1024 angles and a corresponding light detecting apparatus for reproducing information from said optical disc The present invention includes an optical disc whose informational units each contain a raised pad designed to reflect laser light at a compound angle which is 45 degrees from the disc surface and at one of 1024 preset angles between 0 and 360 degrees (with 0 degree... | 03/18/2008 |
| 7339875 | Information storage medium, playback and recording method An information storage medium includes a substrate forming a first groove having a depth, and a second groove adjacent to the first groove and different depth from the first groove; and a recording layer formed on the substrate to record information marks, making op... | 03/04/2008 |
| 7315501 | System and method for recording of information on a holographic recording medium, preferably an optical card The invention relates to a method for the recording and reading of data with a holographic write/read apparatus onto a holographic recording medium with a thin holographic recording layer. The medium is preferably an optical card (2). The recording of the inf... | 01/01/2008 |
| 7315557 | Multi-wavelength light source apparatus A pulse sequence is configured by making a pulse waveform output from a pulse light source into a super Gaussian pulse of the third order or higher, and input to a spectrum expanding device. The spectrum expanding device broadens the spectrum of the pulse sequence w... | 01/01/2008 |
| 7315508 | Multi-layer optical disk and method of producing multi-layer optical disk A multilayer optical disk including a plurality of information storage layers to/from which information is recorded and/or reproduced by an optical head. The plurality of information storage layers are stacked through intermediate layers and each information storage... | 01/01/2008 |
| 7304743 | Diffuse reflectance readhead A glucose monitoring system comprising a readhead positioned a predetermined distance from a sample aperture. The readhead comprises first and second LEDs adapted to emit intersecting paths of light. A beam splitter is positioned at the intersection of the light pat... | 12/04/2007 |
| 7292515 | Multi-layer information storage system with focus and radial positioning error detection An optical information storage system has a multi-recording-layer record carrier and a scanner device for the carrier. The scanner produces a radiation beam which is compensated for spherical aberration for a single height of the scanning spot with the stack of laye... | 11/06/2007 |
| 7236449 | Optical recording medium, stamper for producing optical recording medium, recording/reproducing apparatus, and recording/reproducing method On a magneto-optical disk, a first groove Gv1, a second groove Gv2, and a third groove Gv3 are formed so as to be adjacently arranged. The first groove Gv1 and the second groove Gv2 are deep grooves, and the third groove Gv3... | 06/26/2007 |
| 7180834 | Apparatus and methods for digital data recording An apparatus for holding digital data. The apparatus includes a medium in which a plurality of dimples are spaced for tracking by a playing apparatus. Each dimple includes a plurality of facets, and each facet represents a data bit. Because the location of each dimp... | 02/20/2007 |
| 7136409 | Semiconductor laser device and optical pickup device In this semiconductor laser device, a polarization hologram transmits an outgoing beam directed from a semiconductor laser chip to an optical disk as a forward beam without diffracting the beam, and diffracts a backward beam of the laser beam, which is a return beam... | 11/14/2006 |
| 7116613 | Optical beam position active sensing and control using satellite beams A beam position control system controls a position of a beam directed from a beam source. The beam position control system includes a beam position sensing system that generates one or more satellite beams which are used to determine the position of a main beam. A b... | 10/03/2006 |
| 7054256 | High capacity digital data storage by transmission of radiant energy through arrays of small diameter holes A storage media for storage of data thereon is provided. The storage media including: a first layer, the first layer being substantially transparent to a predetermined radiant energy used for reading the data; and a second layer formed on the first layer and being s... | 05/30/2006 |
| 7050383 | Optical recording medium recorded with information in depth direction, and method and apparatus of reproduction therefrom An optical disk has a lead-in region provided at the inner circumference side and a user region provided at the outer circumference side. Pit string 3 of pits of different depths is formed in the lead-in region. Light beam reflected from the pit string is det... | 05/23/2006 |
| 7016292 | Geometry for optical data storage An optical data storage device includes an optically readable disk that has a body extending in a radial direction from a central axis. The body has a side and an elongated portion that extends along the side. The elongated portion includes a first side surface and ... | 03/21/2006 |
| 6999398 | Method and apparatus for recording information on information recording medium Information is recorded on an information recording medium such as a magneto-optical recording medium, having two recording tracks arranged alternately, typically in a double spiral manner. The two recording tracks have different recording characteristics and inform... | 02/14/2006 |
| 6898169 | Optical pickup head device, information recording/reproducing apparatus, and method for recording information An optical pickup head device includes a diffraction grating for generating zero-order diffracted light and at least first-order diffracted light and provides a tracking error signal with a DPP method. The diffraction grating includes grating patterns with a nonunif... | 05/24/2005 |
| 6891675 | Optical device There is disclosed an optical device in which a first light source for outputting a first wavelength light is apart from a second light source for outputting a second wavelength light by a predetermined distance. An information recording medium is irradiated with th... | 05/10/2005 |
| 6683832 | Optical recording/reproducing apparatus for writing and/or reading data to and/or from optical recording medium having data recorded in pit trains of mutually different depths In an optical disc recording medium having formed thereon a first pit train and a second pit train, these pit trains are formed to be different in pit depth from each other and meet following two relations: ##EQU1## where X: Phase depth of first pit t... | 01/27/2004 |
| 6600711 | Optical recording medium including prepit sequence formed at predetermined interval between land track and neighboring groove track along spiral An optical recording medium includes a land track and a groove track formed as a recording track to record and write information. A prepit sequence is formed on a middle position between the land track and the neighboring groove track as a head part of ea... | 07/29/2003 |
| 6556537 | Optical recording medium having two pit trains of mutually different depths, and master for manufacturing the optical recording medium In an, optical disc recording medium having formed thereon a first pit train and a second pit train, these pit trains are formed to be different in pit depth from each other and meet following two relations: Yࣙ0.5M+73.0411-1098.4983(X-0.5K)+6584.7191(X-0.5K)... | 04/29/2003 |
| 6529463 | Very-high-density memory device utilizing a scintillating data-storage medium A very-high-density memory device which utilizes a scintillating medium for data storage. In one mode, the device operates as a read-only-memory (ROM) unit. In another mode, the device functions as a one-time-write (OTW) and then read-only-memory unit. In... | 03/04/2003 |
| 6512732 | Device for optically scanning information tracks on a plane using two subbeams A device for optically scanning an information plane having tracks. Radiation is supplied by a radiation source focused on the information plane by an objective system. The beam reflected by the information plane is incident on a dividing element, for exa... | 01/28/2003 |
| 6418107 | Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and ... | 07/09/2002 |
| 6400671 | Optical head device In a photodetector, the minimum size of the photodetection area for detecting a focus error signal from a light beam on the inner radius side of a hologram is made smaller than the minimum diameter of diffracted light beam spots (30, 31) for recording and... | 06/04/2002 |
| 6091693 | Optical recording medium and optical information storage unit An optical recording medium is made up of an optically transparent substrate having a groove and a land which have approximately the same width and are formed spirally or concentrically, where the groove has an optical depth described by (1/8+(1/2)n)λ, n... | 07/18/2000 |
| 5875170 | Optical data carriers and reading devices therefor An optical data carrier is written along data tracks with diffraction patterns, each diffraction pattern representing a predetermined bit sequence with n bits. The bit sequences of a diffraction pattern can be determined with a number n of photodetectors ... | 02/23/1999 |
| 5838651 | Optical read-out head capable of improved read-out of media with different pit heights In an optical read-out head used for a multi-value information recording medium, fluctuations in a reproduction signal-to-noise ratio can be greatly reduced to reproduce reflected light with consistent performance. In an optical read-out head, after light... | 11/17/1998 |
| 5761175 | Apparatus and method for reproducing information recored on an optical recording medium on which pits with 2N depths are formed An apparatus for reproducing information recorded on an optical recording medium comprising a substrate on which a series of pits which have depth of 2N (N is an integer equal to or more than 2) steps are formed and a reflecting layer formed on... | 06/02/1998 |
| 5659536 | Optical storage method and device for storing and reading digital information Disclosed is a system for the recording of data on optic disks. Presently used optic disks, which can be read with lasers working in wavelengths of the visible region (between 0.5 and 0.8 microns), have a maximum surface storage density of the order of on... | 08/19/1997 |
| 5644565 | Optical recording medium including a plurality of diffracted grating cells In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. This cell is divided into n (n is an integer of 2 or more) regions such that each divided region represents o... | 07/01/1997 |
| 5625619 | Optical recording medium having a plurality of different diffraction grating cells In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. In accordance with exemplary embodiments, a ratio of a line width of the diffraction gratings to a grating pi... | 04/29/1997 |
| 5602819 | Optical information system to detect reflection of pit depth by evanescent wave The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an optical characteristic value of the laser light, using intera... | 02/11/1997 |
| 5577016 | Recording medium having concavo-convex pits with a maximum and a minimum pit depth depending on the wavelength of a laser light The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an optical characteristic value of the laser light, using intera... | 11/19/1996 |
| 5572508 | Optical disc having square information pits arranged in symmetrical patterns An optical disc is provided with a plurality of information units arranged in the circumferential direction on the track, each of which has a square shape, and has a predetermined unit length in the circumferential direction and a predetermined unit lengt... | 11/05/1996 |
| 5570338 | Optical information recording medium which uses diffraction grating In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. This cell is divided into n (n is an integer of 2 or more) regions such that each divided region represents o... | 10/29/1996 |
| 5553051 | Increased intensity optical recording medium with adjacent grooves of different optical depth and a method and apparatus for reproducing the same An optical recording medium on which information is recorded by irradiating the medium with a light spot to cause a characteristic change of an actual reflection factor, the optical recording medium including grooves of different optical depths which exte... | 09/03/1996 |
| 5539722 | Optical information reproducing system with a reading beam having frequency components of N wavelengths corresponding to four times the N depths to a row of pits Disclosed is an optical disk having at least one pit in each of unit areas continuously provided in a circumferential direction of the disk, said pit having a depth of at least one of n depths (n: an integer equal to or greater than 2). Also disclosed is ... | 07/23/1996 |
