JEREMY JONES
Accountancy in Marblehead, MA
License number
Massachusetts 22218
Issued Date
May 22, 2003
Expiration Date
Jun 30, 2018
Type
Certified Public Accountant
Address
Address
Marblehead, MA 01945
Personal information
See more information about JEREMY JONES at radaris.comName
Address
Phone
47 Fenno St, Cambridge, MA 02138
Professional information
Magnetic Recording Media And Servo Systems Using Light-Transmitting Optical Gratings
US Patent:
4816939, Mar 28, 1989
Filed:
Aug 21, 1986
Appl. No.:
6/898527
Inventors:
Vernon E. Ford - So. Hanover MA
Jeremy K. Jones - Marblehead MA
John J. Mader - Tewksbury MA
William T. Plummer - Concord MA
Jeremy K. Jones - Marblehead MA
John J. Mader - Tewksbury MA
William T. Plummer - Concord MA
Assignee:
Polaroid Corporation - Cambridge MA
International Classification:
G11B 5596
US Classification:
360 7703
Abstract:
Magnetic recording media, and magnetic recording systems using such media, are disclosed which incorporate a light-transmitting optical grating at least substantially coextensive with the magnetic recording area. A second light-transmitting optical grating is associated with the magnetic transducer or read/write head. A moire pattern is produced by light transmitted through both optical gratings, and changes in the moire pattern resulting from changes in the alignment of the optical gratings resulting from movement of the read/write head relative to the media are utilized to provide servo information to keep the magnetic transducer aligned with the magnetic track.
Higher magnetic recording capacities may be obtained using such media and systems, since none of the magnetic recording area is used for servo information.