Coded data generation or conversion – Digital pattern reading type converter – Magnetic – inductive or capacitive
Reexamination Certificate
2007-04-03
2007-04-03
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Digital pattern reading type converter
Magnetic, inductive or capacitive
C341S116000, C340S686100, C324S660000
Reexamination Certificate
active
11042897
ABSTRACT:
An electrostatic encoder comprises a movable element having electrodes and a stator having induction electrodes and potential detection electrodes. The electrostatic encoder further comprises a voltage driving circuit configured to apply a voltage to the induction electrodes of the stator, and generate alternate potential distribution in the electrodes of the movable element by electrostatic induction, a vector generation circuit configured to generate a vector consisting of two signal components, from outputs of the potential detection electrodes of the stator which detect the alternate potential distribution, and a phase splitter circuit configured to measure the relative displacement of the movable element to the stator, from a rotation angle of the vector consisting of the two signal components outputted from the vector generation circuit.
REFERENCES:
patent: 3717869 (1973-02-01), Batz
patent: 3766544 (1973-10-01), Batz
patent: 4879508 (1989-11-01), Andermo
patent: 1-29409 (1989-06-01), None
patent: 4-67881 (1992-10-01), None
Patent Abstracts of Japan of Japanese Publication No. 59-180462, published Oct. 13, 1984.
Mai Lam T.
Olympus Corporation
Scully , Scott, Murphy & Presser, P.C.
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