Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Reexamination Certificate
2011-03-01
2011-03-01
Olson, Jason C (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
C360S075000
Reexamination Certificate
active
07898759
ABSTRACT:
A second waveguide is formed near a first waveguide for guiding light to the vicinity of a main pole of a thermally assisted magnetic recording head, and a portion of light propagated through the waveguide1is branched to the second waveguide. The light transmitting in the second waveguide is detected by a photodetector to detect an intensity of the light propagated through the first waveguide. In the magnetic recording apparatus, an intensity of a semiconductor laser is decreased when an amount of light incident to the photodetector is large and the intensity of the semiconductor laser is increased when the amount of light incident to the photodetector is small. By constituting a feedback loop as described above, the intensity of the light propagated through the first waveguide is kept constant.
REFERENCES:
patent: 5199090 (1993-03-01), Bell
patent: 7519257 (2009-04-01), Lipson et al.
patent: 2006/0233061 (2006-10-01), Rausch et al.
patent: 2007/0159718 (2007-07-01), Kim et al.
patent: 2008/0055784 (2008-03-01), Shimazawa et al.
patent: 01-271931 (1989-10-01), None
patent: 09-180274 (1997-07-01), None
patent: 2003-045004 (2003-02-01), None
patent: 2004-151046 (2004-05-01), None
Hideki Saga, et al., New Recording Method Combining Thermo-Magnetic Writing and Flux Detection, Japanese Journal of Applied Physics, Mar. 1999, pp. 1839-1840, vol. 38 Part 1.
Kenji Kato, et al, Signal Readout Using Small Near-Field Optical Head with Horizontal Light Introduction Through Optical Fiber, The Japan Society of Applied Physics, Aug. 2003, pp. 5102-5106, vol. 42 Part 1.
Edward Gage, et al. Integration Challenges for Hear Assisted Magnetic Recording Data Storage, Technical digest of Magneto-optical Recording Internal Symposium pp. 2, 2006.
T. Matsumoto et al, Writing 40nm Marks by Using a Beaked Metallic Plate Near-Field Optical Probe, Optical Society of America, 2006, p. 259, vol. 31, Tokyo, Japan.
Matsumoto Takuya
Shimizu Junichiro
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Olson Jason C
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