Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Reexamination Certificate
2006-04-18
2006-04-18
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
C324S655000, C324S207150
Reexamination Certificate
active
07030626
ABSTRACT:
A high-frequency oscillation proximity sensor with an improved detection sensitivity uses, as a detection coil11, a two-thread coil formed of substantively two coil conductors joined together at their first ends to form a joint connection end and twisted together, one of the two coil conductors being used as a resonance circuit coil L1and the other as a copper resistance compensation coil L2, and comprises a drive circuit12for supplying a drive current to the joint connection end of the two-thread coil to thereby drive the detection coil to oscillate, a buffer13for taking out an oscillating output voltage generated at the joint connection end of the two-thread coil, and a phase shift circuit15for turning the phase of the oscillating output voltage taken out by the buffer by a predetermined angle and feeding it back to the copper resistance compensation coil to thereby negate the copper resistance of the two-thread coil. The drive circuit comprises a nonlinear amplifier21for changing the amplitude of the oscillating voltage generated at the two-thread coil in multiple stages to thereby impart a soft oscillation characteristic to a high-frequency oscillation circuit comprising the nonlinear amplifier and the two-thread coil.
REFERENCES:
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Hatanaka Hiroshi
Hayashi Takumi
Kawai Shinichi
Deb Anjan
Frishauf Holtz Goodman & Chick P.C.
Yamatake Corporation
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