Patent JPS5530261A successfully refreshed from Google Patents.
Patent US1881102A successfully refreshed from Google Patents.
Patent US4683419A successfully refreshed from Google Patents.
Patent EP0197462A1 successfully refreshed from Google Patents.
EP0197462A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Capacitive position transducer
Assignee: XIAN INSTRUMENTATION FACTORY
•
Filing: 1986-03-27
•
Granted: —
•
Expires: 2006-03-27
Abstract
Abstract 57 A capacitive position transducer for detecting position changes or producing position feed back signals in a servo recorder comprises a rhombic sender electrode (10) connected to a voltage source and a plurality of rectangular receiver electrodes (11-18) insulated from and adjacent to each other. Current flowing through the coupled transmitting and receiver electrodes is rectified by diodes circuits (D<sub>1</sub>-D<sub>8</sub>, D`<sub>1</sub>-D`<sub>8</sub>) and then flows through a serialconnected resistor circuit (R<sub>O</sub>-R<sub>7</sub>) thereby to form an output voltage signal at the ends of the resistor circuit. The linearity of the output voltage signal can be changed by changing the value of the resistor in the resistor circuit. The capacitive positive transducer can also provide the commutating signals required by brushless linear motor.
Inventors
- 👤 Lin Wen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:42
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/24; G01D5/241; G01D5/2412; G01D5/2415
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
324 words
A capacitive position transducer, comprising a capacitive sensing means which includes a first electrode connected to a high frequency voltage source and a pluality of second electrodes insulated from and closely adjacent to each other to form a aligned configuration, wherein said first and second electrodes are arranged to face each other and said first electrode is moveable along said aligned configuration of said second electrodes; a plurality of pairs of diodes with the anode of one of each pair of diodes being connected to the cathode of the other diode to form a junction thereby, and the other two terminals of each pair of diodes being refered to as first and second terminals respectively, all the first terminals of the pairs of diodes being of the same polarity, and so being all the second terminals; and a first network means comprising a plurality of serially connected resistors with a plurality of junction formed therebetween, each said junetion corresponding to one of second-electrodes sequencially, one end of the first network means being connected to a reference point and the other end is used as the output terminal; characterized in that each of the first terminals of said pairs of diodes is connected to a corresponding junction of said first network means; each of the second terminals of said pairs of diodes is connected vi l a a second network means to said reference point; and each of the junction of said pairs of diodes is connected to a corresponding second electrode; wherein as said first electrode is moved along the aligned configuration of said second electrodes, currents will be flowing through the mutual-coupled first and second electrodes, recitified by corresponding diodes and then flowing through corresponding junction and resistors of said first network means thereby to form a total voltage signal related to the relative position between said first and second electrcdes, which is output at said output terminal of said first network means.
Claim 2
Dependent Claim
324 words
A capacitive position transducer, comprising a capacitive sensing means which includes a first electrode connected to a high frequency voltage source and a pluality of second electrodes insulated from and closely adjacent to each other to form a aligned configuration, wherein said first and second electrodes are arranged to face each other and said first electrode is moveable along said aligned configuration of said second electrodes; a plurality of pairs of diodes with the anode of one of each pair of diodes being connected to the cathode of the other diode to form a junction thereby, and the other two terminals of each pair of diodes being refered to as first and second terminals respectively, all the first terminals of the pairs of diodes being of the same polarity, and so being all the second terminals; and a first network means comprising a plurality of serially connected resistors with a plurality of junction formed therebetween, each said junetion corresponding to one of second-electrodes sequencially, one end of the first network means being connected to a reference point and the other end is used as the output terminal; characterized in that each of the first terminals of said pairs of diodes is connected to a corresponding junction of said first network means; each of the second terminals of said pairs of diodes is connected vi l a a second network means to said reference point; and each of the junction of said pairs of diodes is connected to a corresponding second electrode; wherein as said first electrode is moved along the aligned configuration of said second electrodes, currents will be flowing through the mutual-coupled first and second electrodes, recitified by corresponding diodes and then flowing through corresponding junction and resistors of said first network means thereby to form a total voltage signal related to the relative position between said first and second electrcdes, which is output at said output terminal of said first network means.
Claim 3
Dependent Claim
31 words
The transducer according to claim 1, also comprises a closed-loop control system which contrals the total ' current flowing through the first network means and then makes it be a constant.
Claim 4
Dependent Claim
62 words
The transducer according to claim 2, in which the closed-loop control system comprises an amplitier and a high frequency voltage oscillator, the output of the amplifier controling the amplitude of output of said high frequency oscillator, the input signal at said amplifiter being related to said total current, and the output of said high frequency oscillator be sent to said first electrod.
Claim 5
Dependent Claim
18 words
The transducer according to claim 1, in which the shape of the first electrode is substantially rnombic one.
Claim 6
Dependent Claim
44 words
The transducer according to claim 4, in which the digonal length of the above substantially rhombic first electrode in the moving direction is approximately even multiples of the distance. between centers of the second electrodes crossed by one resistor in the first network means.
Claim 7
Dependent Claim
44 words
The transducer according to claim 5, in which the ends of the substantially rhombic first electrode along with the moving direction are modified slightly, enlarged and prolonged thereby to reduce the error caused by transition from one of second electrodes to the other one.
Claim 8
Dependent Claim
105 words
The tranducer according to claim 6, in which, if the number of second electrodes is equal to the multiples of the number of said junctions in the first network means, a modified regions are determined at the edges of said substantially rhombic first electrode and the slope of the edges in the regions is increased, the distance between the centre of the modified region and the symmetric centre line of first electrode along the moving direction being equal to the width of one of second electrodes so as to reduce the erron caused by the transition from one of second electrodes to the other one.
Claim 9
Dependent Claim
45 words
The transducer according to claim 1, in which a high frequency voltage is applied to a long supporting axle and introduced to the mobile first electrode trough a capacitor formed by said axle and the conductive layer lined on the inner wall of a sleeve.
Claim 10
Dependent Claim
38 words
The transducer according to claim 1, in which the relationship between said output voltage signal and said relative position changes into nonlinear one from linear one by changing the value of said resistors in the first network means..
Claim 11
Dependent Claim
16 words
The transducer according to claim 1, in which the second network means is a conductive wire.
Claim 12
Dependent Claim
17 words
The transducer according to claim 1, in which the second network means is at least a resistor.
Claim 13
Dependent Claim
78 words
The transducer according to claim 1, in which the second network means has N resistors with a first and a second ends, the second terminals of all pairs of diodes being sequentially connected to the first ends of N resistors with a period of N, the second ends of N resistors being connected to said reference point through a third network means thereby to produce from first ends of N resistors commutating signals required by brushless linear motor.
Claim 14
Dependent Claim
16 words
The transducer according to claim 12, in which the third network means is a conductive wire.
Claim 15
Dependent Claim
17 words
The transducer according to claim 12, in which the third network means is at least a resistor.
References Cited (Backward Citations)
DE2324472A1
Cited
EP0053091A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.