REMOTE METER READING SYSTEM HAVING ELECTRO-MECHANICAL OSCILLATORS

• US 3,654,605 A
• Filed: 03/02/1970
• Issued: 04/04/1972
• Est. Priority Date: 03/03/1969
• Status: Expired due to Term

• Current Assignee: Tsukasa Kawamura, Yukio Honda
• Original Assignee: Tsukasa Kawamura, Yukio Honda
• Inventors: Kawamura, Tsukasa, Honda, Yukio
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US05/015,501
• Time in Patent Office: 764 Days
• Field of Search: 340/150,151,152
• US Class Current: 340/870.02
• CPC Class Codes: G08C 19/14 using combination of fixed frequencies
• CPC Class Codes: H04Q 9/08 Calling by using continuous ac

Abstract

In a remote reading system to read values displayed in a remote local office in a central office, the local office is provided with a digit wheel, a plurality of permanent magnets arranged on one side of the digit wheel in accordance with predetermined decimal - binary codes and a plurality of passive oscillators closely adjacent the digit wheel, a predetermined number of the passive oscillators being assigned to one bit of the codes whereas the central office is provided with a single oscillator of variable frequency or a plurality of oscillators of different frequencies assigned to the passive oscillators, a plurality of filter receivers responsive to oscillation frequencies of the passive oscillators, a binary-decimal converter for the outputs from the filter receivers, means to display the output from the converter, and a modulator. Each of the passive oscillators operates to resonate to a frequency assigned thereto and sent from the central office when the passive oscillator comes to face one of the permanent magnets and the different oscillation frequencies are applied from the central office simultaneously to the passive oscillators in the local office through the modulator which connects the passive oscillators with the filter receivers to read in the central office the digits in the digit wheel.

Claims

1. A remote reading system comprising in combination a local office, said local office comprising a digit wheel, a plurality of permanent magnets arranged on one side of said digit wheel to correspond to the digits on said digit wheel to be displayed in accordance with predetermined decimal-binary codes and a plurality of passive electro-mechanical oscillators located closely adjacent said one side of said digit wheel, a predetermined number of said passive oscillators being assigned to one bit of said codes;

and a central office, said central office comprising at least one oscillator oscillating at discrete frequencies assigned to said passive oscillators, a plurality of filter receivers responsive to oscillation frequencies of said passive oscillators, a binary-decimal converter for the outputs from said filter receivers, means to display the output from said converter, and a modulator, each one of said passive oscillators operating to resonate to a frequency assigned thereto and sent from said central office when said one passive oscillator comes to face to one of said permanent magnets, said oscillation frequencies being applied from said central office simultaneously to said passive oscillators in said local office through said modulator and said modulator connecting said passive oscillators with said filter receivers whereby to read in said central office the values displayed in said remote local office.

2. The remote reading system according to claim 1 wherein said passive oscillators are set to dissonate to the assigned frequency of said oscillation frequencies from said central office when said passive oscillators come to confront said permanent magnets on one side of said digit wheel and the dissonate states of said passive oscillators are detected by said filter receivers.

3. A remote reading system comprising in combination a local office, said local office comprising a digit wheel, a plurality of permanent magnets arranged on one side of said digit wheel to correspond to the digits on said digit wheel to be displayed in accordance with predetermined decimal - binary codes and A plurality of passive electro-mechanical oscillators located closely adjacent said one side of said digit wheel, a predetermined number of said oscillators being assigned to one bit of said codes;

and a central office, said central office comprising a single variable frequency oscillator oscillating at discrete frequencies assigned to respective one of said passive frequencies, a resonance detector and means to connect said passive oscillators to said oscillator in said central office to form loop feedback circuits, each of said passive oscillators operating to resonate to a frequency assigned thereto and sent from said central office when said one passive oscillator comes to face to one of said permanent magnets, said oscillation frequency of said single oscillator being varied successively and said resonance detector successively detecting the resonance states of said loop circuits at said assigned frequencies whereby to read in said central office the values displayed by said digit wheel in said remote local office.

4. A remote reading system comprising in combination a remote local office, said local office comprising a digit wheel, a plurality of permanent magnets arranged on one side of said digit wheel to corresponds to the digits on said digit wheel to be displayed in accordance with predetermined decimal-binary codes and a plurality of electro-mechanical oscillators located closely adjacent said one side of said digit wheel, a predetermined number of said oscillators being assigned to one bit of said codes;

and a central office, said central office comprising a plurality of oscillators oscillating at discrete frequencies assigned to respective one of said passive oscillators, means to connect said oscillators in said central office and said passive oscillators in said local office in loop feedback circuits and a plurality of detectors for detecting the pass-filtered frequency of the currents in said loop feedback circuits, each one of said filters operating to resonate to a corresponding frequency of said oscillators in said central office when said one passive oscillator comes to face of said permanent magnets, and said detectors detecting the signal in said feedback loops at the time of resonance whereby to read in said central office the values displayed by said digit wheel in said local office.

5. The remote reading system according to claim 3 wherein said filters are set to dissonate to the assigned frequency when said passive oscillators confront associated permanent magnets and the dissonance states of said loop circuits at said assigned frequencies are sequentially detected by said resonance detector while the oscillation frequency of said oscillator in said central office is varied sequentially.