Coin accepter/rejector including symmetrical dual feedback oscillator
First Claim
1. A coin testing device and apparatus comprising a symmetric, dual feedback oscillator including two tank circuits, one of the tank circuits including a reference reactance, the other of the tank circuits including sensing reactance, said dual feedback oscillator forming a symmetrical, substantially balanced circuit;
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Abstract
In a coin operated machine, the coins are tested by utilizing a symmetric, dual feedback oscillator, each having a tank circuit with a reactance, one of the reactances being a reference reactance and the other one a sensing reactance being passed by a coin to be tested. Separate outputs are derived from symmetrical points in the oscillator and are compared in some form either through phase detection or by detecting the sum of the oscillating signals or by detecting the common mode and/or the differential mode of the envelopes or a combination of several of these tests whereby common mode and differential mode detection of the envelopes together is preferred. The reference reactance includes preferably a coin exactly of the type to be tested. Multi-coin variance and digital processing is additionally disclosed.
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Citations
32 Claims
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1. A coin testing device and apparatus comprising a symmetric, dual feedback oscillator including two tank circuits, one of the tank circuits including a reference reactance, the other of the tank circuits including sensing reactance, said dual feedback oscillator forming a symmetrical, substantially balanced circuit;
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comparator means connected for deriving separate outputs from symmetrical points of the oscillator and providing a signal indicative of a pre-determined relationship between the oscillatory signals in said reference and said sensing reactances in the presence of a particular type of coin adjacent to said sensing reactance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A coin testing device comprising:
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oscillator means including symmetrical, dual feedback oscillator having a reference reactance and a sensing reactance; and comparator means connected for deriving an output indicative of a predetermined relationship between the signals in said reference and said sensing reactances in the presence of a particular type of coin adjacent to said sensing reactance. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A coin testing device and apparatus comprising a symmetric, dual feedback oscillator each including a tank circuit, one of the tank circuits including a reference reactance, the other of the tank circuits including a sensing reactance, said dual feedback oscillator forming a symmetrical, substantially balanced circuit;
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comparator means connected for deriving an oscillator voltage from at least one of the oscillator nodes and from a reference source, and providing a signal indicative of a pre-determined relationship between the oscillatory signal and said reference in the presence of a particular type of coin adjacent to said sensing reactance. - View Dependent Claims (32)
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Specification