News Column

Patent Issued for Accurate Radius and Velocity Measurement of Tape Transports

July 15, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Hancock, Reed A. (Tucson, AZ); Inch, Randy C. (Tucson, AZ); Ogura, Eiji (Yokohama, JP), filed on August 30, 2012, was published online on July 1, 2014.

The patent's assignee for patent number 8767335 is International Business Machines Corporation (Armonk, NY).

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to data storage systems, and more particularly, this invention relates to providing a system, method and computer program product for accurately measuring a radius and velocity of tape transports.

"In magnetic storage systems, data is read from and written onto magnetic recording media utilizing magnetic transducers. Data is written on the magnetic recording media by moving a magnetic recording transducer to a position over the media where the data is to be stored. The magnetic recording transducer then generates a magnetic field, which encodes the data into the magnetic media. Data is read from the media by similarly positioning the magnetic read transducer and then sensing the magnetic field of the magnetic media. Read and write operations may be independently synchronized with the movement of the media to ensure that the data can be read from and written to the desired location on the media.

"An important and continuing goal in the data storage industry is that of increasing the density of data stored on a medium. For tape storage systems, that goal has led to increasing the track and linear bit density on recording tape, and decreasing the thickness of the magnetic tape medium. However, the development of small footprint, higher performance tape drive systems has created various problems in the design of a tape head assembly for use in such systems.

"In a tape drive system, magnetic tape is moved over the surface of the tape head at high speed. Usually the tape head and tape surface roughness are designed to minimize the spacing between the head and the tape. The spacing between the magnetic head and the magnetic tape is crucial so that the recording gaps of the transducers, which are the source of the magnetic recording flux, are in near contact with the tape to effect writing sharp transitions, and so that the read element is in near contact with the tape to provide effective coupling of the magnetic field from the tape to the read element."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "A method according to one embodiment includes selecting an initial radius value (Rfull) for an outgoing reel, where Rfull is the initial radius of a tape on the outgoing reel; unwinding the tape from the outgoing reel; computing a radius value of the tape on the outgoing reel during the unwinding; adjusting the computed radius with an offset calculated from a direct measurement of velocity from the tape position; and outputting the adjusted computed radius.

"A method according to another embodiment includes selecting an initial radius value (R0) for an incoming reel, where R0 is the initial radius of the incoming reel; winding the tape onto the incoming reel; computing a radius value of the tape on the incoming reel during the winding; adjusting the computed radius with an offset calculated from a direct measurement of velocity from the tape position; and outputting the adjusted computed radius.

"A system according to one embodiment includes a magnetic head; a drive mechanism for passing a magnetic medium over the magnetic head; and a controller electrically coupled to the magnetic head. The controller is configured and/or programmable to: select an initial radius value (R0) for an incoming reel, where R0 is the initial radius of the incoming reel; cause winding of the tape onto the incoming reel; compute a radius value of the tape on the incoming reel during the winding; adjust the computed radius with an offset calculated from a direct measurement of velocity from the tape position; and output the adjusted computed radius.

"A system according to another embodiment includes a magnetic head; a drive mechanism for passing a magnetic medium over the magnetic head; and a controller electrically coupled to the magnetic head. The controller is configured and/or programmable to: select an initial radius value (R0) for an incoming reel, where R0 is the initial radius of the incoming reel; cause winding of the tape onto the incoming reel; compute a radius value of the tape on the incoming reel during the winding; adjust the computed radius with an offset calculated from a direct measurement of velocity from the tape position; and output the adjusted computed radius.

"Other aspects and embodiments of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention."

For additional information on this patent, see: Hancock, Reed A.; Inch, Randy C.; Ogura, Eiji. Accurate Radius and Velocity Measurement of Tape Transports. U.S. Patent Number 8767335, filed August 30, 2012, and published online on July 1, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8767335.PN.&OS=PN/8767335RS=PN/8767335

Keywords for this news article include: Information Technology, Information and Data Storage, International Business Machines Corporation.

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Source: Information Technology Newsweekly


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