Information recording/reproducing device

Patent 6560168 Issued on May 6, 2003. Estimated Expiration Date:

December 12, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Magnetic signal reproducing device, magnetic signal reproducing method and magnetic recording medium for high density reproduction
Patent #: 6333827
Issued on: 12/25/2001
Inventor: Hamamoto, et al.

Information reproducing device, information recording/reproducing head, and information reproducing method utilizing mono-magnetic domain structure Patent #: 6396774
Issued on: 05/28/2002
Inventor: Matsumoto, et al.

Inventors

Assignee

Hitachi, Ltd.

Application

No. 719427 filed on 12/12/2000

US Classes:

369/13.01, STORAGE OR RETRIEVAL BY SIMULTANEOUS APPLICATION OF DIVERSE TYPES OF ELECTROMAGNETIC RADIATION369/13.15, Leakage magnetic field369/13.33, Near field optic369/44.23Structure for shaping beam or causing astigmatic condition

Examiners

Primary: Edun, Muhammad

Attorney, Agent or Firm

Antonelli, Terry, Stout & Kraus, LLP

International Class

G11B 011/00

Abstract

An information recording apparatus using a recording medium which holds information by reversed magnetic domains on a perpendicular magnetic recording film includes an irradiation unit for applying electromagnetic energy or light onto the recording medium, and a magnetic flux detection unit for detecting magnetic leakage flux emerging from the recording medium, the magnetic flux detection unit being disposed on the same side as the irradiation unit with respect to the recording medium. As a result, both side recording of the recording medium can be conducted.