Communications: electrical – Continuously variable indicating – With particular receiver
Patent
1980-04-10
1981-09-15
Groody, James J.
Communications: electrical
Continuously variable indicating
With particular receiver
324 60R, 34087037, 34087038, G08C 2502, G08C 1910, G08C 1904
Patent
active
042900654
ABSTRACT:
The position transducer uses an elongated resistance which can be switched to a fixed voltage source to provide a voltage gradient along the resistance. A metal strip with a single aperture is arranged to be moved along parallel to the resistance and another elongated metal conductor is positioned on the other side of the metal strip so that the metal strip with the aperture is sandwiched between the resistance and the conductor. Physical movement of the strip moves the aperture and thus will change the voltage value electrostatically coupled from the voltage on the resistance to the conductor. An analog voltage constituting a function of a digital count value is repetitively switched onto the entire resistance and compared with this voltage value at a given high frequency. If the analog voltage is less than the voltage value on the resistance opposite the aperture, an up count signal is generated to increase the digital count and thus increase the analog voltage. If the analog voltage is greater than the voltage value, a down count signal is generated to decrease the digital count value and thus decrease the analog value. Comparisons are made on each cycle of said given high frequency. Either or both the digital count value and analog signal can be used as an accurate indication of the physical position of the aperture.
REFERENCES:
patent: 3237178 (1966-02-01), Valentine
patent: 3296522 (1967-01-01), Wolfendale
patent: 3784897 (1974-01-01), Norrie
patent: 3960010 (1976-06-01), Gustafsson
patent: 4193063 (1980-03-01), Hitt et al.
IBM Technical Disclosure Bulletin, Palmer, Dec. 1971, pp. 1989-1990.
Groody James J.
Pastoriza Ralph B.
Sullivan Thomas P.
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