Variable capacitance type encoder

Details Variable capacitance type encoder Variable capacitance type encoder

1988-04-20

1989-06-27

Moore, David K.

Communications: electrical

Continuously variable indicating

With particular transmitter

324 60C, G01D 5243, G01B 730

Patent

active

048433870

ABSTRACT:
A variable capacitance type encoder for measuring the length of an object to be measured on the basis of detecting the amount of movement of a probe as a function of the variation of electrostatic capacity between a rotary disk which is secured to a shaft and a pair of fixed disks which are secured to a frame body so as to be opposed to the rotary disk. On at least one fixed disk is provided first and second transmitting electrodes composed of a plurality of electrode elements to which voltages of different phases are applied. The rotary disk is provided with first and second receiving electrodes for receiving signals of a common phase by electrostatic coupling with both transmitting electrodes. Each fixed disk is further provided with an output electrode which is electrostatically coupled with the respective receiving electrode.

REFERENCES:
patent: 2527215 (1950-10-01), Hahn
patent: 3198937 (1985-08-01), Wooster
patent: 3961318 (1976-06-01), Farrand et al.
patent: 4092579 (1978-05-01), Weit
patent: 4339709 (1982-07-01), Brihier
Hardway, "Position Sensor Combines Low Cost with High Accuracy and Reliability", Electronics, Aug. 16, 1971, pp. 86-88.

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