Patents by Inventor John F. Heanue

John F. Heanue has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6075673
    Abstract: A composite slider, for use in an optical or magneto-optical head that includes an optical assembly, comprises a mounting block that supports optical components, and a body that provides an air bearing surface and that further supports optical components. The slider body and mounting block include channel patterns that define an optical path. The slider mounting block includes an adhesive release channel disposed transversely relative to the optical path. The slider body includes a vertical channel and a lateral channel within which the optical components are disposed.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: June 13, 2000
    Assignee: Read-Rite Corporation
    Inventors: Jeffrey P. Wilde, Jerry E. Hurst, Jr., John F. Heanue, John H. Jerman
  • Patent number: 6049430
    Abstract: A composite micro-lens for use in an optical or magneto-optical information storage system, made up of one or more lens elements which, when coupled in assembly, provide a desired numerical aperture. The design may provide, if necessary, a photo resist lens, a shaped ball lens, or one or more contoured surfaces within the composite construction to correct for aberrations. The composite lens designed in this manner allowing for the use of wafer-level assembly processes to provide high volume production capabilities. It is further intended that this micro-lens design support integration in an optical or magneto-optical head design.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: April 11, 2000
    Assignee: Seagate Technology
    Inventors: John F. Heanue, Mark A. Wardas
  • Patent number: 6044056
    Abstract: A magneto-optical flying head utilizes a steerable mirror in combination with a light source and a lens to write and read data onto a magneto-optical storage disk. A beam of laser light transmitted from the light source to the optical head is reflected onto a steerable micro-machined folding mirror. The reflected light from the folding mirror is directed through an embedded micro-objective GRIN lens. Fine tracking and short seeks to adjacent tracks are performed by rotating the mirror about an axis of rotation. In this way a focus spot is scanned back and forth in a direction which is approximately parallel to the radial direction of the storage disk.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: March 28, 2000
    Assignee: Seagate Technology, Inc.
    Inventors: Jeffrey P. Wilde, Joseph E. Davis, Jerry E. Hurst, Jr., John F. Heanue, Kurt Petersen, Terry McDaniel, Jeff Drazan
  • Patent number: 6040930
    Abstract: The data encoder (e.g. an amplitude spatial light modulator, ASLM) in a volume holographic storage system is rotated by 45.degree. relative to the normal to the plane of the reference and signal beams, such that the near-Fourier transform pattern of the encoder at the medium has an X-shape. The encoder rotation allows tight packing of spatial multiplexing subvolumes in a rectangular array, and provides for uniform spatial frequency filtering in a perpendicular geometry.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: March 21, 2000
    Assignee: Siros Technologies, Inc.
    Inventors: John F. Heanue, Andrew J. Daiber, James Colvin
  • Patent number: 6034938
    Abstract: An optical data storage and retrieval system uses a flying head. The flying head is supported on a moving media having information stored in a plurality of stored data locations thereon. Information is stored in each of the plurality of media locations as physical structures capable of modulating the polarization state of incident light into one of two output polarization states. The flying head includes an optical processing assembly which directs an incident light beam having a source polarization state onto the moving media, accessing successive data locations. A reflected light beam having the source polarization state of the incident light beam modulated by a respective polarization modifying data location into one of the output polarization states is received by the flying head.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: March 7, 2000
    Assignee: Seagate Technology, Inc.
    Inventors: John F Heanue, Jeffrey P. Wilde, Jerry E. Hurst, Jr., John H. Jerman
  • Patent number: 6023355
    Abstract: A method for coded-wavelength multiplexing according to which a signal waves S.sub.i (r) is recorded in a holographic medium in a counter-propagating geometry using corresponding writing reference waves R.sub.i (r). The method involves selecting discrete wavelengths .lambda. and encoding reference wave vectors .rho..sub.l which make up writing reference waves R.sub.i (r) such that the writing reference waves R.sub.i (r) at each wavelength .lambda. are orthogonal. The stored signal waves S.sub.i (r) are reconstructed in the form of reconstruction waves A.sub.c (.sigma.) with reconstruction reference waves R.sub.c (r) selected from among the writing reference waves R.sub.i (r). In the event of angular multiplexing of the reference wave vectors .rho..sub.l, it is possible to use one reference wave to produce a number of reconstruction waves A.sub.c (.sigma.) and generate a mosaic of desired holographic pages.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: February 8, 2000
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Matthew C. Bashaw, John F. Heanue, Lambertus Hesselink
  • Patent number: 5995251
    Abstract: A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial light detector such as a CCD. The lens is located between the SLM and CCD such that the SLM is imaged onto the CCD (i.e. the positions of the SLM, lens, and CCD satisfy the lens equation). The holographic storage material is located between the lens and CCD. Preferably, the storage material is located centered upon a Fourier plane of the lens. In this case, the apparatus also has a phase mask located adjacent to the SLM. Alternatively, the storage material is located a distance away from the Fourier plane or is not centered on the Fourier plane. In yet another embodiment, the holographic storage material is located in contact with the CCD.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: November 30, 1999
    Assignee: Siros Technologies, Inc.
    Inventors: Lambertus Hesselink, John F. Heanue, Andrew J. Daiber
  • Patent number: 5940549
    Abstract: An optical system and method for selective transmission of light between a source of light and a set of storage disks along an optical path that includes at least one individual optical fiber. In an optical system and method that uses a magneto-optical storage medium, single-mode polarization maintaining optical fibers and a compensator may be included. Alternatively, the optical system and method may include an optical switch.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: August 17, 1999
    Assignee: Seagate Technology, Incorporated
    Inventors: Jeffery P. Wilde, Joseph E. Davis, Jerry E. Hurst, Jr., John F. Heanue, Jeff Drazan
  • Patent number: 5940514
    Abstract: An encryption method and apparatus for holographic data storage are disclosed. In a system using orthogonal phase-code multiplexing, data is encrypted by modulating the reference beam using an encryption key K represented by a unitary operator. In practice, the encryption key K corresponds to a diffuser or other phase-modulating element placed in the reference beam path, or to shuffling the correspondence between the codes of an orthogonal phase function and the corresponding pixels of a phase spatial light modulator. Because of the lack of Bragg selectivity in the vertical direction, the phase functions used for phase-code multiplexing are preferably one dimensional. Such phase functions can be one-dimensional Walsh functions. The encryption method preserves the orthogonality of reference beams, and thus does not lead to a degradation in crosstalk performance.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: August 17, 1999
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: John F. Heanue, Matthew C. Bashaw, Lambertus Hesselink
  • Patent number: 5877873
    Abstract: A video image F?k! is identified as a basis image and stored as a basis page S?k! in a holographic storage medium. A subsequent image F?k+n! is stored by recording in the medium a page S?k+n!=F?k+n!-a?k!F?k!, where a?k!.noteq.0 and preferably a?k!=1. The page S?k! is recorded with a reference beam R?k!, while S?k+n! is recorded with a reference beam R?k+n! orthogonal to R?k!. The basis page is reset whenever the average intensity of a page to be stored exceeds a predetermined threshold. An image F'?k! is retrieved by reading basis page S?k! and letting F'?k!=S?k!. Subsequent images F'?k+n! are retrieved as S?k+n!+b?k!S?k!, where b?k!.noteq.0 and preferably b?k!=a?k!=1. The page addition step is performed coherently, i.e. by accessing the medium with a reference wave function R?k+n!+b?k!R?k!.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: March 2, 1999
    Inventors: Matthew C. Bashaw, John F. Heanue, Lambertus Hesselink
  • Patent number: 5850299
    Abstract: A method of choosing an angle between a reference beam and a signal beam in a holographic storage apparatus is presented. The angle between the reference and signal beams can be optimized in light of crosstalk, scattering and wavelength seperation considerations.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: December 15, 1998
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: David Lande, John F. Heanue, Matthew C. Bashaw, Lambertus Hesselink
  • Patent number: 5850375
    Abstract: An optical system and method for transmission of light between a RF modulated source of light and a magneto-optical storage location along an optical path including: orthogonally aligned first and second single-mode polarization maintaining optical fibers, a flying magneto-optical head, and a quarter-wave plate positioned on the flying magneto-optical head.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: December 15, 1998
    Assignee: Seagate Technology, Inc.
    Inventors: Jeffrey P. Wilde, Jerry E. Hurst, John F. Heanue
  • Patent number: 5740184
    Abstract: Signal processing methods for addressing intersymbol interference in page-access optical memories such as holographic or two photon systems are disclosed. The invention takes advantage of the cartesian arrangement of data in page-access optical memories. A detector using the Viterbi algorithm is used to decode data row by row. Decision feedback is used in the direction perpendicular to the Viterbi direction. The use of data from previously decoded rows allows a reduction in the complexity of the Viterbi detector.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: April 14, 1998
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: John F. Heanue, Korhan Gurkan, Lambertus Hesselink
  • Patent number: 5729364
    Abstract: Ionic and impurity concentrations in a photorefractive holographic storage medium are optimized such that electronic and ionic Debye numbers match an expected grating wave number K, at fixing and recording temperatures, respectively. Simultaneous and sequential recording and fixing are evaluated. The photovoltaic effect is reduced, subject to response time and absorption constraints, by matching reduced and oxidized impurity concentrations.
    Type: Grant
    Filed: July 5, 1996
    Date of Patent: March 17, 1998
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Matthew C. Bashaw, John F. Heanue, Lambertus Hesselink
  • Patent number: 5450218
    Abstract: A method for encoding and decoding digital data for storage in a holographic medium (12). Digital data, consisting of binary data (B.sub.i) or grey scale data (A.sub.i), is encoded in bit groups or digit groups (B.sub.k, A.sub.k) containing at least k=1 bits or digits, respectively, by assigning to each bit group (B.sub.k) one reference bit (B.sub.r) and to each digit group (A.sub.k) two reference digits (A.sub.r1, A.sub.r2), assigning the bits of group (B.sub.k) to information bits (B.sub.j), assigning the digits of group (A.sub.k) to information digits (A.sub.j), assigning the reference bit (B.sub.r) and information digits (B.sub.j) to a reference pixel (P.sub.r) and information pixels (P.sub.j) chosen from pixels (24) of a holographic signal modulator (18), and assigning the reference digits (A.sub.r1, A.sub.r2) and information digits (A.sub.j) to reference pixels (P.sub.r1, P.sub.r2) and information pixels (P.sub.j) chosen from pixels (24) of the holographic signal modulator (18).
    Type: Grant
    Filed: August 4, 1994
    Date of Patent: September 12, 1995
    Assignee: Board of Trustees of the Leland Stanford Junior University
    Inventors: John F. Heanue, Matthew C. Bashaw, Lambertus Hesselink