Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2000-11-17
2003-10-14
Wu, Daniel J. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S657000, C340S660000, C340S689000, C340S815710, C324S173000, C324S174000
Reexamination Certificate
active
06633233
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject invention relates to sensor of the type for sensing acceleration.
2. Description of the Prior Art
The prior art is replete with accelerometers; however, there is a need for a sensitive acceleration rate sensor in a miniature format that is compatible with integrated circuit technology.
SUMMARY OF THE INVENTION AND ADVANTAGES
A motion detector comprising a magnetic element producing a magnetic field, a giant magnetoresistive sensor for changing in electrical resistance in response to changes in the magnetic field produced by the magnetic element, and a voltage sensor for sensing the voltage across the giant magnetoresistor sensor.
The invention also includes a method of detecting motion comprising the steps of producing a magnetic field, changing electrical resistance of the sensor in response to changes in the magnetic field, and measuring the voltage across the giant magnetoresistor sensor.
Accordingly, the subject invention provides a sensitive acceleration rate sensor in a miniature format that is compatible with integrated circuit technology.
REFERENCES:
patent: 3739158 (1973-06-01), Woodward
patent: 3899779 (1975-08-01), Malozemoff
patent: 3996571 (1976-12-01), Chang
patent: 4031526 (1977-06-01), Archer et al.
patent: 4246474 (1981-01-01), Lazzari
patent: 4326188 (1982-04-01), Dahlberg
patent: 4629982 (1986-12-01), Kieslich
patent: 4864288 (1989-09-01), Cross
patent: 5675459 (1997-10-01), Sato et al.
patent: 5729137 (1998-03-01), Daughton et al.
patent: 5825593 (1998-10-01), Mowry
patent: 6111716 (2000-08-01), Ngo et al.
Giant Magneto-Resistance Devices, authored by E. Hirota, H. Sakakima and K. Inomata, and published by Springer Series In Surface Sciences. (Book cover, title page, preface, table of contents and Section 4.3.1. (pp. 100-105) are enclosed.
Howard & Howard
Previl Daniel
University of Florida
Wu Daniel J.
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