Patents by Inventor Sandeepan Bhattacharya

Sandeepan Bhattacharya 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: 8493689
    Abstract: A head gimbal assembly includes a gimbal, a slider, and a polymer layer. The gimbal comprises a metal layer, and the metal layer of the gimbal defines a gimbal mounting portion for attachment to a metallic load beam and a gimbal tongue extending from the gimbal mounting portion. The slider comprises a ceramic material for carrying a transducing head, and at least a portion of the slider is secured to the gimbal tongue. The polymer layer is positioned adjacent to the gimbal and configured for limiting ceramic-to-metal and metal-to-metal contact.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: July 23, 2013
    Assignee: Seagate Technology LLC
    Inventors: Manish Virmani, Paritosh Chandrakant Panchal, James Fisher, Keefe Michael Russell, Sandeepan Bhattacharya
  • Patent number: 8300362
    Abstract: A head gimbal assembly for use with a load beam includes a gimbal, a slider for carrying a transducing head, and first and second tabs. The gimbal is configured to be supported by the load beam, and includes a gimbal tongue. At least a portion of the slider is secured to the gimbal tongue. The first tab extends from the gimbal tongue proximate a first corner of the slider. The second tab is spaced from the first tab and extends from the gimbal tongue proximate a second corner of the slider.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: October 30, 2012
    Assignee: Seagate Technology LLC
    Inventors: Manish Virmani, Paritosh Chandrakant Panchal, James Fisher, Keefe Michael Russell, Sandeepan Bhattacharya
  • Patent number: 7898771
    Abstract: A head suspension assembly for carrying a slider assembly in a disc drive has a beam component having a front end and a rear end, a hinge component near the rear end of the beam component for connecting to an actuation means, and a gimbal component near the front end of the main beam section for carrying a transducing head. At least one of the hinge component and the gimbal component is made from a structural damping material having high stiffness and high damping capacity.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: March 1, 2011
    Assignee: Seagate Technology LLC
    Inventors: Joseph H. Sassine, Sandeepan Bhattacharya, Andrew J. Hutchinson, Joel D. Limmer
  • Publication number: 20100315745
    Abstract: A head gimbal assembly includes a gimbal, a slider, and a polymer layer. The gimbal comprises a metal layer, and the metal layer of the gimbal defines a gimbal mounting portion for attachment to a metallic load beam and a gimbal tongue extending from the gimbal mounting portion. The slider comprises a ceramic material for carrying a transducing head, and at least a portion of the slider is secured to the gimbal tongue. The polymer layer is positioned adjacent to the gimbal and configured for limiting ceramic-to-metal and metal-to-metal contact.
    Type: Application
    Filed: June 15, 2009
    Publication date: December 16, 2010
    Applicant: Seagate Technology LLC
    Inventors: Manish Virmani, Paritosh Chandrakant Panchal, James Fisher, Keefe Michael Russell, Sandeepan Bhattacharya
  • Publication number: 20100315744
    Abstract: A head gimbal assembly for use with a load beam includes a gimbal, a slider for carrying a transducing head, and first and second tabs. The gimbal is configured to be supported by the load beam, and includes a gimbal tongue. At least a portion of the slider is secured to the gimbal tongue. The first tab extends from the gimbal tongue proximate a first corner of the slider. The second tab is spaced from the first tab and extends from the gimbal tongue proximate a second corner of the slider.
    Type: Application
    Filed: June 15, 2009
    Publication date: December 16, 2010
    Applicant: Seagate Technology LLC
    Inventors: Manish Virmani, Paritosh Chandrakant Panchal, James Fisher, Keefe Michael Russell, Sandeepan Bhattacharya
  • Patent number: 7660073
    Abstract: A suspension is disclosed that includes a pre-load section and a load section. The pre-load section is configured to be connected to a base. The load section is connected to the pre-load section and comprises a load beam portion, a flex circuit portion, and a brace. The brace extends laterally exterior to the load beam portion proximate to the pre-load section. The brace increases the lateral sway vibration mode of the load section, allowing the load beam portion to be narrower, and provide a decreased weight and increased torsion vibration mode, while also maintaining an increased lateral sway vibration mode.
    Type: Grant
    Filed: July 14, 2006
    Date of Patent: February 9, 2010
    Assignee: Seagate Technology LLC
    Inventors: Markus Erwin Mangold, Sandeepan Bhattacharya
  • Publication number: 20090207528
    Abstract: A suspension is provided, which has proximal and distal ends and a longitudinal axis extending from the proximal end toward the distal end. A rotating hinge rotates the distal end about the longitudinal axis in response to vertical motion of the distal end relative to the proximal end. In one example, the suspension includes a preformed twist deformation, which rotates the distal end about the longitudinal axis relative to the proximal end axis in a direction opposite to rotation by the rotating hinge, in response to the vertical motion.
    Type: Application
    Filed: March 4, 2009
    Publication date: August 20, 2009
    Applicant: Seagate Technology LLC
    Inventors: Roger A. Resh, James R. Mahoney, Sandeepan Bhattacharya, Jagdish L. Agrawal, Ravishankar A. Shivarama, James A. Fisher
  • Patent number: 7551400
    Abstract: An apparatus, method and combination for dissipating vibration from a head suspension of a data storage device. The combination includes a rotating disc in a data exchange relationship with a read/write head supported by a head suspension formed by the method. The method includes the steps of; forming a mounting region and a load beam region each adjacent a bend region; removing material from the bend region to form an aperture, a strut, an isolation aperture and a damping material support structure; and affixing a damping material to the strut and the damping material support structure. The apparatus includes the bend region adjacent both the mounting region and the load beam region, with the damping material attached to the strut as well as to the damping material support structure. The load beam region includes a rigid portion, which supports a flexure upon which a read/write head is attached.
    Type: Grant
    Filed: January 15, 2004
    Date of Patent: June 23, 2009
    Assignee: Seagate Technology LLC
    Inventors: Frederick Paul Renken, Brian Dean Hammel, Shri Hari Narayan, Dave Paul McReynolds, Sandeepan Bhattacharya
  • Patent number: 7542239
    Abstract: A suspension is provided, which has a base, a load beam and a hinge structure. The hinge structure and at least one of the base and the load beam are formed of a single continuous piece of multiple layer laminate material, which includes first and second layers. The hinge structure includes a first beam formed by the first layer and a second beam formed by the second layer. The first layer is absent along the second beam and the second layer is absent along the first beam such that the first and second beams are vertically offset from one another. The first and second beams extend between the base and the load beam.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: June 2, 2009
    Assignee: Seagate Technology, LLC
    Inventors: Roger A. Resh, James R. Mahoney, Sandeepan Bhattacharya, Jagdish L. Agrawal, Ravishankar A. Shivarama, James A. Fisher
  • Patent number: 7466517
    Abstract: One embodiment of the present invention provides a unified suspension that includes an integral, continuous laminate, which has a thick actuator arm portion, a thin pre-load portion, and a beam portion, all formed of the same single laminate. The pre-load portion is integrally connected to the actuator arm portion, is thinner than the actuator arm portion, and is configured to apply a pre-load force. The beam portion is integrally connected to the pre-load portion, and is configured for attaching a gimbal to it. This integral, continuous laminate substantially lowers the mass of the suspension, provides excellent shock, resonance and lift tab performance, lowers power consumption requirements, and simplifies the complexity and cost of manufacturing components for a suspension and for assembling the components of the suspension together and into a larger system of which the suspension is a part.
    Type: Grant
    Filed: June 15, 2005
    Date of Patent: December 16, 2008
    Assignee: Seagate Technology LLC
    Inventors: Eric S. Isom, Sandeepan Bhattacharya, Jagdish L. Agrawal
  • Publication number: 20080013214
    Abstract: A suspension is disclosed that includes a pre-load section and a load section. The pre-load section is configured to be connected to a base. The load section is connected to the pre-load section and comprises a load beam portion, a flex circuit portion, and a brace. The brace extends laterally exterior to the load beam portion proximate to the pre-load section. The brace increases the lateral sway vibration mode of the load section, allowing the load beam portion to be narrower, and provide a decreased weight and increased torsion vibration mode, while also maintaining an increased lateral sway vibration mode.
    Type: Application
    Filed: July 14, 2006
    Publication date: January 17, 2008
    Applicant: Seagate Technology LLC
    Inventors: Markus Erwin Mangold, Sandeepan Bhattacharya
  • Publication number: 20070115590
    Abstract: A suspension is provided, which has proximal and distal ends and a longitudinal axis extending from the proximal end toward the distal end. A rotating hinge rotates the distal end about the longitudinal axis in response to vertical motion of the distal end relative to the proximal end.
    Type: Application
    Filed: November 21, 2005
    Publication date: May 24, 2007
    Applicant: Seagate Technology LLC
    Inventors: Roger Resh, James Mahoney, Sandeepan Bhattacharya, Jagdish Agrawal, Ravishankar Shivarama, James Fisher
  • Publication number: 20060285253
    Abstract: One embodiment of the present invention provides a unified suspension that includes an integral, continuous laminate, which has a thick actuator arm portion, a thin pre-load portion, and a beam portion, all formed of the same single laminate. The pre-load portion is integrally connected to the actuator arm portion, is thinner than the actuator arm portion, and is configured to apply a pre-load force. The beam portion is integrally connected to the pre-load portion, and is configured for attaching a gimbal to it. This integral, continuous laminate substantially lowers the mass of the suspension, provides excellent shock, resonance and lift tab performance, lowers power consumption requirements, and simplifies the complexity and cost of manufacturing components for a suspension and for assembling the components of the suspension together and into a larger system of which the suspension is a part.
    Type: Application
    Filed: June 15, 2005
    Publication date: December 21, 2006
    Applicant: Seagate Technology LLC
    Inventors: Eric Isom, Sandeepan Bhattacharya, Jagdish Agrawal
  • Patent number: 7136261
    Abstract: A suspension for supporting a head slider over a media surface. The suspension includes a load beam, a base plate interface region, and a base plate. The load beam has a proximal end, a distal end and longitudinal centerline. A localized stiffening portion is raised above the load beam, and is connected to the load beam by rounded side edges. The base plate interface region is coupled to a proximal end of the load beam, and provides a pre-load bend. Finally, base plate is coupled to the base plate interface region such that the base plate is coupled to a side of the base plate interface region that is opposite the media surface.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: November 14, 2006
    Assignee: Seagate Technology LLC
    Inventors: Sandeepan Bhattacharya, Srinivas Tadepalli
  • Patent number: 7002780
    Abstract: An actuation assembly includes a movable actuator arm, a suspension assembly, a slider, and means for attaching the slider to the gimbal. The actuator arm supports the suspension assembly, which includes a gimbal carrying a gimbal bond pad that is electrically isolated from the gimbal. The slider includes an air bearing surface and a gimbal opposing face opposite the air bearing surface. The means for attaching the slider to the gimbal provide a direct contact between the gimbal and the slider and elevate a plane of the gimbal opposing face with respect to the gimbal bond pad. The means for attaching the slider to the gimbal is integral with the gimbal.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: February 21, 2006
    Assignee: Seagate Technology LLC
    Inventors: Michael L. Rancour, Richard L. Segar, Sandeepan Bhattacharya
  • Patent number: 6995953
    Abstract: A head gimbal assembly has a gimbal with a limiter formed from a sheet prior to attachment to the load beam structure. The limiter has a pair of flange extensions, each flange extension having an arm extension. The flange extensions and the arm extension are bent around a tip of the load beam to interleave the limiter around the load beam. The arm extensions have a narrower width than a width of the flange extensions, providing room for adjustment to the pitch and roll attitude of the system after assembly.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: February 7, 2006
    Assignee: Seagate Technology LLC
    Inventors: James Roger Mahoney, Sandeepan Bhattacharya
  • Patent number: 6977798
    Abstract: A suspension for a storage device includes a metal layer and one or more composite stiffeners bonded to the metal layer to stiffen part but not all of the suspension. The composite stiffeners are made of a composite material and are bonded to the metal layer by an adhesive. Under most embodiments, the composite material has a higher stiffness to weight ratio than a metal.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: December 20, 2005
    Assignee: Seagate Technology LLC
    Inventors: Kevin J. Schulz, Marsha A. Huha, Sandeepan Bhattacharya
  • Publication number: 20050190502
    Abstract: Ahead suspension assembly for carrying a slider assembly in a disc drive has a beam component having a front end and a rear end, a hinge component near the rear end of the beam component for connecting to an actuation means, and a gimbal component near the front end of the main beam section for carrying a transducing head. At least one of the hinge component and the gimbal component is made from a structural damping material having high stiffness and high damping capacity.
    Type: Application
    Filed: February 27, 2004
    Publication date: September 1, 2005
    Applicant: Seagate Technology LLC
    Inventors: Joseph Sassine, Sandeepan Bhattacharya, Andrew Hutchinson, Joel Limmer
  • Publication number: 20050157427
    Abstract: An apparatus, method and combination for dissipating vibration from a head suspension of a data storage device. The combination includes a rotating disc in a data exchange relationship with a read/write head supported by a head suspension formed by the method. The method includes the steps of; forming a mounting region and a load beam region each adjacent a bend region; removing material from the bend region to form an aperture, a strut, an isolation aperture and a damping material support structure; and affixing a damping material to the strut and the damping material support structure. The apparatus includes the bend region adjacent both the mounting region and the load beam region, with the damping material attached to the strut as well as to the damping material support structure. The load beam region includes a rigid portion, which supports a flexure upon which a read/write head is attached.
    Type: Application
    Filed: January 15, 2004
    Publication date: July 21, 2005
    Inventors: Frederick Renken, Brian Hammel, Shri Narayan, Dave McReynolds, Sandeepan Bhattacharya
  • Patent number: 6765759
    Abstract: A system and a method for increasing suspension resonance frequencies of a head suspension assembly of a disc drive includes, in one example embodiment, attaching a base plate to an actuator arm assembly of the disc drive such that the base plate including the actuator arm assembly are in actuating relationship with a rotating disc of the disc drive. A two-piece suspension member having a first and second pieces is attached to the base plate. A gimbal is attached to the two-piece suspension member such that a predetermined bendable area is formed between the first and second pieces and on the gimbal having a stiffer preload bend radius. A stiffer preload bend radius provides a higher stiffness-to-mass ratio without increasing the spring rate of the head suspension assembly to increase suspension resonance frequencies of the head suspension assembly to fall outside a bandwidth of a servo drive to reduce off-track motion of the head suspension assembly during track follow-and-seek operations of the disc drive.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: July 20, 2004
    Assignee: Seagate Technology LLC
    Inventors: Sandeepan Bhattacharya, Kevin Jon Schulz, Haiming Zhou, David G. Qualey