Patents by Inventor Jathan D. Edwards
Jathan D. Edwards 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).
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Publication number: 20040231531Abstract: A date storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replica lands and replica grooves. The method includes providing a master substrate. The master substrate is at least partially covered with a layer of photosensitive material. A surface relief pattern having master lands and master grooves is recorded in the data storage disk master, including the steps of exposing and developing the photosensitive material is controlled to form master grooves extending down to a substrate interface between the master substrate and the layer of photosensitive material, such that the width of the master grooves at the substrate interface corresponds to a desired width of the replica lands.Type: ApplicationFiled: March 2, 2004Publication date: November 25, 2004Inventors: Jathan D. Edwards, Donald J. Kerfeld
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Patent number: 6804034Abstract: Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. The substrates may be formed with fluid containment features in proximity to outer edges of the respective substrates. Also, the substrates may be formed with centerpieces that are recessed relative to the outer surfaces of the respective substrates. Such substrate features can improve and simplify the media fabrication process and may improve media quality.Type: GrantFiled: August 20, 2002Date of Patent: October 12, 2004Assignee: Imation Corp.Inventor: Jathan D. Edwards
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Patent number: 6791784Abstract: The diffraction-based monitoring techniques described herein can be used, for example, as quality assurance measure in manufacture of magnetic recording media with servo tracking. In one embodiment, the invention presents a system comprising a light source such as a laser that directs light upon a surface of a magnetic recording medium. The magnetic recording medium has two or more physical marks, and the light striking the magnetic recording medium produces a diffraction pattern. A light detector such as a photodiode detects some or all of the diffraction pattern. The physical marks may be servo tracks on the magnetic recording medium, and the detected diffraction pattern is a function of the characteristics of the servo tracks.Type: GrantFiled: March 23, 2001Date of Patent: September 14, 2004Assignee: Imation Corp.Inventor: Jathan D. Edwards
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Publication number: 20040170118Abstract: A data storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replica lands and replica grooves. The method includes providing a master substrate. The master substrate is at least partially covered with a layer of photosensitive material. A surface relief pattern having master lands and master grooves is recorded in the data storage disk master, including the steps of exposing and developing the photosensitive material. The exposing and developing of a specified thickness of photosensitive material is controlled to form master grooves extending down to a substrate interface between the master substrate and the layer of photosensitive material, such that the width of the master grooves at the substrate interface corresponds to a desired width of the replica lands.Type: ApplicationFiled: March 2, 2004Publication date: September 2, 2004Inventor: Jathan D. Edwards
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Publication number: 20040170117Abstract: A data storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replica lands and replica grooves. The method includes providing a master substrate. The master substrate is at least partially covered with a layer of photosensitive material. A surface relief pattern having master lands and master grooves is recorded in the data storage disk master, including the steps of exposing and developing the photosensitive material. The exposing and developing of a specified thickness of photosensitive material is controlled to form master grooves extending down to a substrate interface between the master substrate and the layer of photosensitive material, such that the width of the master grooves at the substrate interface corresponds to a desired width of the replica lands.Type: ApplicationFiled: March 2, 2004Publication date: September 2, 2004Inventors: Jathan D. Edwards, Donald J. Kerfeld
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Publication number: 20040165235Abstract: In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate portion having a thickness less than approximately 2 millimeters. A holographic recording material may be sandwiched between the first and second thermoplastic substrate portions. By making thermoplastic substrate portions sufficiently thin, edge wedge problems can be avoided.Type: ApplicationFiled: February 18, 2004Publication date: August 26, 2004Inventors: Jathan D. Edwards, Frank E. Aspen, Ramon F. Hegel, Chad R. Sandstrom
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Publication number: 20040156297Abstract: The invention is directed to self-referenced holographic recording techniques that make use of an element of a holographic medium to create a reference beam from a zero frequency Fourier component of a data encoded object beam. In other words, the self-referencing element may be formed on the holographic medium, rather then being a separate element of the holographic recording system. The element may comprise a diffusive element on the medium, designed to create a reference beam having controlled angles, phase and/or amplitude.Type: ApplicationFiled: February 7, 2003Publication date: August 12, 2004Applicant: Imation Corp.Inventor: Jathan D. Edwards
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Patent number: 6762865Abstract: The invention is directed to self-referenced holographic recording techniques that make use of a diffusive element. Self-referenced holography refers to holographic recording techniques in which a reference beam is created from a zero frequency Fourier component of a data encoded object beam. In accordance with the invention, a diffusive element can be positioned in a holographic recording system to create the reference beam from the zero frequency Fourier component of the data encoded object beam. Using a diffusive element to create a reference beam in self-referenced holography can provide advantages to the self-referenced holographic recording system.Type: GrantFiled: February 7, 2003Date of Patent: July 13, 2004Assignee: Imation Corp.Inventor: Jathan D. Edwards
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Patent number: 6728196Abstract: A data storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replica lands and replica grooves. The method includes providing a master substrate. The master substrate is at least partially covered with a layer of photosensitive material. A surface relief pattern having master lands and master grooves is recorded in the data storage disk master, including the steps of exposing and developing the photosensitive material. The exposing and developing of a specified thickness of photosensitive material is controlled to form master grooves extending down to a substrate interface between the master substrate and the layer of photosensitive material, such that the width of the master grooves at the substrate interface corresponds to a desired width of the replica lands.Type: GrantFiled: May 7, 2001Date of Patent: April 27, 2004Assignee: Imation Corp.Inventor: Jathan D. Edwards
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Publication number: 20040042055Abstract: In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate portion having a thickness less than approximately 2 millimeters. A holographic recording material may be sandwiched between the first and second thermoplastic substrate portions. By making thermoplastic substrate portions sufficiently thin, edge wedge problems can be avoided.Type: ApplicationFiled: May 19, 2003Publication date: March 4, 2004Inventors: Jathan D. Edwards, Frank E. Aspen, Ramon F. Hegel, Chad R. Sandstrom
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Publication number: 20040042375Abstract: In one embodiment, a holographic data storage medium includes a substrate, a holographic recording material, and an optically detectable tracking pattern on the medium. The substrate may have first and second substrate portions. The holographic recording material may be a photopolymer, and the medium may have a sandwiched construction, where the holographic recording material is sandwiched between the first and second substrate portions. The optically detectable tracking pattern may be replicated on at least one of the substrate portions. Alternatively, the optically detectable tracking pattern may be recorded as a holographic grating in the holographic recording material. The tracking pattern may facilitate the ability to pinpoint the location of the holographic bit maps on the holographic medium to within a fraction of a micron.Type: ApplicationFiled: August 25, 2003Publication date: March 4, 2004Inventor: Jathan D. Edwards
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Publication number: 20040036931Abstract: Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. The substrates may be formed with fluid containment features in proximity to outer edges of the respective substrates. Also, the substrates may be formed with centerpieces that are recessed relative to outer surfaces of the respective substrates. Such substrate features can improve and simplify the media fabrication process and may improve media quality.Type: ApplicationFiled: August 20, 2002Publication date: February 26, 2004Applicant: Imation Corp.Inventor: Jathan D. Edwards
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Patent number: 6678237Abstract: A multi-layer optical storage medium includes a transparent substrate, a partially reflective layer, a transparent spacer, and a highly reflective layer. One pattern of data pits is provided on the substrate, adjacent the partially reflective layer, and another pattern of pits is provided on the spacer layer, adjacent the highly reflective layer. The partially reflective layer may be made of amorphous selenium (a-Se) and preferably has an index of refraction having a real component, n, greater than 2.8 and an imaginary component, K, less than 0.01. The invention also includes the optical data storage systems compatible with such media.Type: GrantFiled: March 27, 1997Date of Patent: January 13, 2004Assignee: Imation Corp.Inventors: Jathan D. Edwards, William C. Mitchell, Mark A. Arps
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Patent number: 6628598Abstract: A system for reading data from recording media having topographical features readable with a slider-mounted non-magnetic transducer sensitive primarily to changes in local aerodynamic boundary conditions.Type: GrantFiled: December 5, 2000Date of Patent: September 30, 2003Assignee: Imation Corp.Inventors: Jathan D. Edwards, Garry R. Lundstrom, Paul R. Iverson, Joseph H. Sexton
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Patent number: 6625100Abstract: In one embodiment, a holographic data storage medium includes a substrate, a holographic recording material, and an optically detectable tracking pattern on the medium. The substrate may have first and second substrate portions. The holographic recording material may be a photopolymer, and the medium may have a sandwiched construction, where the holographic recording material is sandwiched between the first and second substrate portions. The optically detectable tracking pattern may be replicated on at least one of the substrate portions. Alternatively, the optically detectable tracking pattern may be recorded as a holographic grating in the holographic recording material. The tracking pattern may facilitate the ability to pinpoint the location of the holographic bit maps on the holographic medium to within a fraction of a micron.Type: GrantFiled: March 20, 2001Date of Patent: September 23, 2003Assignee: Imation Corp.Inventor: Jathan D. Edwards
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Patent number: 6611365Abstract: In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate portion having a thickness less than approximately 2 millimeters. A holographic recording material may be sandwiched between the first and second thermoplastic substrate portions. By making thermoplastic substrate portions sufficiently thin, edge wedge problems can be avoided.Type: GrantFiled: March 20, 2001Date of Patent: August 26, 2003Assignee: Imation Corp.Inventors: Jathan D. Edwards, Frank E. Aspen, Ramon F. Hegel, Chad R. Sandstrom
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Patent number: 6538776Abstract: The invention presents the concept of self-referenced holographic data recording. In exemplary embodiments, the invention comprises methods of recording holograms on holographic data storage media; media produced by such methods; and self-referencing holographic data storage systems. A method of recording data in a holographic recording medium may comprise illuminating a medium with a data encoded first optical beam, optically directing a zero frequency Fourier component of the first optical beam to create a second optical beam, and illuminating the medium with the second optical. In some embodiments, for example, a self-referencing holographic data storage system has a single optical path directed towards a medium.Type: GrantFiled: March 20, 2001Date of Patent: March 25, 2003Assignee: Imation Corp.Inventor: Jathan D. Edwards
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Publication number: 20030043731Abstract: The invention is directed toward techniques for creating molded substrates for use in various different data storage media. The molded substrates have improved thickness profiles that can improve media quality, and in some cases facilitate higher data storage densities. In many cases, the improved thickness profile is a thickness profile that has improved flatness. Mechanical flatness or optical flatness can be achieved. In particular, optical flatness is desirable for substrates used in holographic data storage media having a sandwiched construction.Type: ApplicationFiled: September 4, 2001Publication date: March 6, 2003Applicant: Imation Corp.Inventors: Donald J. Kerfeld, Douglas J. Chaput, Jathan D. Edwards, Chad R. Sandstrom
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Publication number: 20030043723Abstract: The invention presents systems and methods for initializing the phase-change layer of an optical medium. The method includes alternately quenching the phase-change material into amorphous states and crystallization states in a single pass of an optical head past the optical medium.Type: ApplicationFiled: September 4, 2001Publication date: March 6, 2003Applicant: Imation Corp.Inventor: Jathan D. Edwards
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Publication number: 20020135829Abstract: In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate portion having a thickness less than approximately 2 millimeters. A holographic recording material may be sandwiched between the first and second thermoplastic substrate portions. By making thermoplastic substrate portions sufficiently thin, edge wedge problems can be avoided.Type: ApplicationFiled: March 20, 2001Publication date: September 26, 2002Applicant: Imation Corp.Inventors: Jathan D. Edwards, Frank E. Aspen, Ramon F. Hegel, Chad R. Sandstrom