KR20160013483A - Method for detecting number of transferring banknotes using capacitor charged voltage of ultrasonic sensor - Google Patents

Method for detecting number of transferring banknotes using capacitor charged voltage of ultrasonic sensor Download PDF

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KR20160013483A
KR20160013483A KR1020140095088A KR20140095088A KR20160013483A KR 20160013483 A KR20160013483 A KR 20160013483A KR 1020140095088 A KR1020140095088 A KR 1020140095088A KR 20140095088 A KR20140095088 A KR 20140095088A KR 20160013483 A KR20160013483 A KR 20160013483A
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South Korea
Prior art keywords
capacitor
voltage value
ultrasonic
value
voltage
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KR1020140095088A
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Korean (ko)
Inventor
김영배
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노틸러스효성 주식회사
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Priority to KR1020140095088A priority Critical patent/KR20160013483A/en
Publication of KR20160013483A publication Critical patent/KR20160013483A/en

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
    • G07D11/20—Controlling or monitoring the operation of devices; Data handling
    • G07D11/22—Means for sensing or detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1912—Banknotes, bills and cheques or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
    • B65H7/125—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation sensing the double feed or separation without contacting the articles
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
    • G07F19/20—Automatic teller machines [ATMs]
    • G07F19/201—Accessories of ATMs

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

The present invention relates to a method of detecting the number of bills using the charge / discharge voltage value of an ultrasonic sensor, and more particularly, to a method of detecting the number of bills passing through a conveying path, A capacitor is connected to a receiving side of an ultrasonic sensor for detecting whether or not paper money has passed through the path, and whether or not the paper money has passed through the conveying path is detected using a capacitor voltage value charged in the capacitor by an ultrasonic signal received at the receiving unit One of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, ninth, ninth, tenth, Of the paper currency using the charging / discharging voltage value of the ultrasonic sensor capable of effectively discriminating whether or not And a method of detecting the number of sheets.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of detecting the number of banknotes using a charge / discharge voltage of an ultrasonic sensor,

The present invention relates to a method of detecting the number of bills using the charge / discharge voltage value of an ultrasonic sensor, and more particularly, to a method of detecting the number of bills passing through a conveying path, A capacitor is connected to a receiving side of an ultrasonic sensor for detecting whether or not paper money has passed through the path, and whether or not the paper money has passed through the conveying path is detected using a capacitor voltage value charged in the capacitor by an ultrasonic signal received at the receiving unit One of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, ninth, ninth, tenth, Of the paper currency using the charging / discharging voltage value of the ultrasonic sensor capable of effectively discriminating whether or not And a method of detecting the number of sheets.

2. Description of the Related Art Generally, in a banking automation machine, a banknote bundle detection device is provided on a conveying path on which banknotes are conveyed, and it is detected whether or not banknotes transported in a single sheet along the conveying route are stacked and transported.

At this time, an ultrasonic sensor is mainly used for the above-described paper currency detection apparatus. The paper currency detection apparatus using such an ultrasonic sensor is a wave detection apparatus disclosed in Korean Patent Publication No. 10-2006-0108399, The ultrasonic wave emitted from the ultrasonic wave emitting portion is irradiated to the banknote, the ultrasonic wave transmitted through the banknote is received through the receiving portion, and the output waveform of the received signal is analyzed to detect the bending of the banknote.

On the other hand, the ultrasonic sensor has a characteristic in which the sensitivity varies according to the ambient temperature. When the ambient temperature of the automated teller machine changes, the level of the ultrasonic signal received through the receiver changes, There is a problem in that it occurs.

That is, conventionally, a predetermined reference value is set for the signal value of the ultrasonic signal received through the receiver, and then the ultrasonic signal value received through the receiver is measured. If the measured signal value is equal to or higher than the preset reference value, , And if it is equal to or less than the reference value, it is determined to be two pieces.

However, the above-described ultrasonic sensor has a characteristic of being sensitive to changes in the surrounding environment (particularly temperature), and accordingly, when the ambient temperature is lowered, the sensitivity of the receiver changes and the level of the received signal value changes greatly.

That is, when the ambient temperature of the ultrasonic sensor is lowered to the low temperature due to the change of the surrounding environment of the financial automation equipment, the sensitivity of the ultrasonic receiving part is changed, so that the received signal values at one- So that there is a problem that an error occurs in the detection of bills.

In order to solve this problem, the applicant of the present invention has proposed a method for detecting a change in the detection signal value of the ultrasonic sensor receiver by using the noise signal value of the ultrasonic sensor, (Application No. 10-2014-0005450).

In other words, in the bill detection method using the noise signal value of the conventional ultrasonic sensor as described above, when the bill insertion is detected, the noise signal value detected by the ultrasonic sensor reception unit is first measured to set a reference value, And the ultrasonic signal transmitted through the receiving unit is measured to determine the occurrence of the passage of the bill when the measured signal value is equal to or lower than a preset reference value.

At this time, in setting the reference value of the dummy discrimination, the capacitor connected to the ultrasonic receiving unit is discharged to reset the voltage value. Then, in a state in which the ultrasonic transmitter does not operate, the capacitor voltage value The reference value is set.

That is, as shown in FIG. 1, when a predetermined charge wait time Ts elapses after the capacitor voltage value sensed by the noise signal received by the receiver is discharged and reset, the voltage waveform 10 The saturation voltage Vn is detected and used as a reference value for discrimination of a bimodal.

As a result, the reference value is set by applying the noise signal value varying in accordance with the ambient environment (temperature) as the reference value, so that it is possible to effectively set the reference value regardless of the degree of change in the level of the signal value detected by the ultrasonic- It is possible to discriminate whether or not the banknotes are to be removed.

On the other hand, if the signal value received through the receiving section is less than or equal to the reference value, based on the reference value varying according to the temperature, But it is difficult to distinguish whether the bill is zero or one.

2, when the predetermined charging waiting time Ts elapses, the voltage value of the signal waveform 20 of the zero crossing bank note and the voltage value of the signal waveform 30 of the one passing bank note become equal to each other, The difference between the zero-voltage value and the one voltage value detected by the voltage-controlled oscillator is insufficient and the division becomes difficult.

Therefore, in the conventional bank note detection method, only the occurrence of bank notes can be detected only, and it is difficult to discriminate one or the other of the bank notes to be passed, and the number of the passed bank notes and the detected bank notes can not be accurately confirmed have.

Korean Patent Laid-Open No. 10-2006-0108399 (Dual sensor using ultrasonic sensor and method thereof, publication date: October 18, 2006)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art. That is, an object of the present invention is to provide an ultrasonic sensor that detects the number of bills passing through a conveying path and inputted to a financial automation apparatus using an ultrasonic sensor, The ultrasonic sensor according to any one of claims 1 to 3, further comprising: an ultrasonic sensor for detecting a passage of the bill on the conveying path by using a capacitor voltage value charged to the capacitor by the ultrasonic signal received by the receiving unit, The capacitor charging voltage at a certain point in time after discharging is compared with a preset reference voltage, so that it is possible to effectively discriminate whether 0, 1 or 2 sheets of bank notes pass through the conveying path.

In order to achieve the above object, according to the present invention, a capacitor is connected to a receiving side of an ultrasonic sensor for detecting the passage of a bill on a conveying path, and a capacitor voltage value charged in the capacitor by an ultrasonic signal received by the receiving unit The method comprising the steps of discharging an ultrasonic wave from an ultrasonic wave generator and discharging the capacitor to reset a voltage value, and then detecting the number of bills passing through the conveyance path, A voltage value charged in the capacitor at a predetermined constant voltage detection time Tm is measured and the measured voltage value is compared with a first reference value and a second reference value that are set in advance so that zero, And whether or not two sheets are detected.

The method of detecting the number of bills using the charging / discharging voltage value of the ultrasonic sensor according to the present invention is characterized in that a capacitor is connected to the receiving side of an ultrasonic sensor for detecting the passage of bills on the conveying path, Wherein the controller is configured to detect the passage of the bill on the conveying path by using the capacitor voltage value to be charged by synchronizing the signal transmission time point of the ultrasonic sensor with the discharge time point of the capacitor, There is an effect that it is possible to effectively discriminate whether 0, 1 or 2 sheets of bank notes passing through the conveyance path are compared with the reference voltage.

FIG. 1 and FIG. 2 are diagrams for explaining a waveform of an ultrasonic signal measured by a conventional ultrasonic receiving unit. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ultrasonic sensor for detecting the number of bills using a charging / discharging voltage value of an ultrasonic sensor according to an embodiment of the present invention.
FIG. 4 is a view showing a voltage signal charged in a capacitor by an ultrasonic signal received by a receiving unit in the ultrasonic sensor shown in FIG. 3; FIG.
FIG. 5 is a view showing a voltage signal charged in a capacitor by an ultrasonic signal received by a receiving unit according to the number of banknotes to be passed in the ultrasonic sensor shown in FIG. 3;
6 is a view for explaining a method of detecting the number of bills using the charge / discharge voltage value of the ultrasonic sensor according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a view for explaining a structure of an ultrasonic sensor according to an embodiment of the present invention. FIG. 4 is a diagram showing a voltage signal charged in a capacitor by an ultrasonic signal received by a receiving unit in the ultrasonic sensor shown in FIG. And FIG. 5 is a diagram showing a voltage signal charged in a capacitor by an ultrasonic signal received by a receiving unit according to the number of banknotes to be passed in the ultrasonic sensor shown in FIG.

3, in the system in which the method of detecting the number of bills using the charging / discharging voltage value of the ultrasonic sensor according to the embodiment of the present invention is applied, The ultrasonic wave receiving unit 60 and the ultrasonic wave receiving unit 60 are disposed opposite to each other in the direction perpendicular to the conveying direction of the banknote and the capacitor 70 is connected to the ultrasonic wave receiving unit 60 side, So that the capacitor 70 is charged with a voltage.

In addition, by synchronizing the signal transmission time point of the ultrasonic sensor and the discharge time point of the capacitor 70, when the input of the banknote is detected, the ultrasonic signal is emitted through the ultrasonic transmission unit 50 at a predetermined time interval, The controller 70 discharges and resets the capacitor 70 connected to the ultrasonic wave receiver 60 in synchronization with the transmission time of the ultrasonic wave.

At this time, in the capacitor 70, as shown in FIG. 4, the voltage is discharged and reset for a predetermined discharge time Td, and then the voltage is charged again from the predetermined charging time Tc as the received ultrasonic signal is input. And when the predetermined charging waiting time Ts elapses, the saturation is reached as shown in the voltage waveform shown in the figure.

At this time, the time (Td) during which the discharge of the capacitor is completed may be varied depending on the operation setting of the capacitor, and is set to be about 50 μs or less.

The time Tc at which the charging is started again by the ultrasonic signal received by the ultrasonic receiver in the state that the capacitor is discharged varies depending on the number of banknotes passing through the conveying path. When the banknote is interposed in the path of the ultrasonic signal transmitted to the ultrasonic receiving unit, the transfer speed of the ultrasonic signal is changed by the interposed banknotes.

That is, the transmission speed of the ultrasonic signal transmitted from the ultrasonic transmitter to the ultrasonic receiver depends on the presence or absence of a medium (here, paper money) having a density different from that of air on the path, Depends on the physical properties and thickness of the medium interposed in the path.

For example, FIG. 5 shows a signal waveform when the interval between the ultrasonic transmitter and the receiver is 20 mm, the ultrasonic wave of 10 pulses is emitted for 33 μsec at the transmitter, and the thickness of the bill passing through the conveyer is 0.7 mm In this case, when the banknote passing through the conveying path is zero (100), the time when the first ultrasonic pulse emitted from the transmitting portion is received by the receiving portion and the capacitor voltage starts to be charged is approximately 63 microseconds after the reset .

On the other hand, when the number of banknotes passing through the conveying path is one (200), the transfer speed of the ultrasonic pulses emitted from the transmission portion is slowed by the influence of the banknotes present on the signal path. As a result, The time at which the capacitor voltage starts to be charged starts to appear at about 75 占 퐏 after the reset.

Further, in the case of two bank notes passing through the conveying path (300), the transmission speed of the ultrasonic pulses emitted from the transmission portion is further lowered by the two bank notes present on the signal path, It starts at a later point.

In addition, the charging speed of the voltage charged in the capacitor is different according to the number of the banknotes passing through the conveying path, that is, when the number of banknotes to be passed is zero (100), there is no medium interposed in the conveying path The ultrasound signal emitted from the transmitter and the reflected wave signal reflected between the transmitter and the receiver are received by the receiver without loss, so that the voltage charging speed of the capacitor increases rapidly.

On the other hand, in the case of one banknote being passed (200), the ultrasonic wave emitted from the transmission portion is attenuated by the banknote interposed on the conveying path, the reflected wave is also attenuated, and a substantial part of the signal received by the receiving portion is lost and received , And the charging rate of the voltage charged in the capacitor is relatively slower than the case where the charging rate is 0 (100).

 Further, when the number of banknotes passing through the conveying path is two, the amount of attenuation of the signal is significantly increased by the two banknotes interposed in the conveying path by the ultrasonic waves emitted from the transmitting portion, Only the signal of the noise level is received and not only the charging start time at which the capacitor voltage is charged is delayed, but the charging speed is also very slow, so that it appears to be almost similar to the noise charging voltage.

Therefore, in the method of detecting the number of sheets of paper money according to the present invention, based on the change in the charge voltage of the capacitor which varies according to the number of paper money passing through the conveyance path as described above, the capacitor voltage value And to compare the detected voltage value with a preset reference value to effectively determine whether 0, 1, or 2 sheets of paper money pass through the transport path.

6 is a view for explaining a method of detecting the number of bills using the charge / discharge voltage value of the ultrasonic sensor according to the embodiment of the present invention.

As shown in FIG. 6, in the method of detecting the number of bills using the charging / discharging voltage value of the ultrasonic sensor according to the embodiment of the present invention, first, 0, 1, or 2 sheets of paper money passing through the transport path are discriminated The first reference value and the second reference value are set and a voltage detection point Tm for detecting a capacitor voltage value for comparing the first reference value and the second reference value is set.

First, in setting the first reference value, the capacitor connected to the ultrasonic receiving unit is discharged to reset the voltage value. Thereafter, the ultrasonic wave is emitted from the ultrasonic wave transmitting unit in the initial state where there is no passing bill, A saturation voltage value of the capacitor by the signal is measured and a value of 85% to 95% of the measured saturation voltage value is set as a first reference value.

In addition, in setting the second reference value, the capacitor connected to the ultrasonic receiving unit is discharged to reset the voltage value. Then, in a state in which the ultrasonic transmitting unit does not operate, the saturated state of the capacitor due to the noise signal received by the ultrasonic receiving unit the saturation voltage value is measured, and the measured voltage value is set as the second reference value.

That is, when the ultrasonic wave is not emitted from the ultrasonic wave emitting portion, the noise signal around the sensor is received in the ultrasonic wave receiving portion, so that the charge and the natural discharge are performed by the noise signal received by the capacitor. The voltage reaches saturation, and the capacitor saturation state voltage value (noise voltage value) due to the noise at this time is set to the second reference value.

Meanwhile, the constant voltage detection time Tm of the capacitor voltage value for comparing the first reference value and the second reference value, which are set as described above, with the capacitor voltage value to be recharged after the reset is obtained by discharging the capacitor connected to the ultrasonic wave receiving unit, The ultrasonic wave is emitted from the ultrasonic wave generator and the ultrasonic wave is discharged from the ultrasonic wave receiver and the charged voltage value of the capacitor due to the signal received by the ultrasonic wave receiver is saturated in the initial state in which no passing bill is present, And the average value of the measured saturation points can be set as the capacitor voltage detection time Tm.

The voltage detection time Tm may be variously set according to the arrangement interval of the ultrasonic sensors, the operation setting conditions, and the like, and may be set in a range of usually 80 mu s to 100 mu s.

When the measured capacitor voltage value is compared with the first reference value and the second reference value by measuring the voltage value of the capacitor at the voltage detection time Tm through the above setting, if the number of bank notes passing through the conveyance path is zero (100 , The voltage of the capacitor is charged at a high speed and reaches a saturation state at a set voltage detection time Tm, and appears to be equal to or higher than the first reference value.

When the number of banknotes passing through the conveyance path is one (200), the start time of charging of the capacitor voltage is delayed, the charging speed thereof becomes slow, and the charging amount of the capacitor charging voltage is reduced, So that the voltage value of the second transistor Q3 falls below the first reference value.

However, since the capacitor voltage at this time is charged by a considerable amount of voltage due to the influence of the signal value transmitted through one sheet and transmitted to the receiver, the capacitor voltage has a higher voltage value than the voltage value of the noise state, .

On the other hand, when the number of bank notes passing through the conveying path is two (300), since the signal received at the receiving section is almost entirely attenuated and only the noise level signal is detected, the voltage value measured at the set voltage detection point Tm is noise The saturation voltage value of the signal, that is, the second reference value, is not reached.

Therefore, in the method of detecting the number of bills according to the present invention, when the bill is detected, the ultrasonic wave is emitted from the ultrasonic wave generator, the capacitor connected to the ultrasonic wave receiver is discharged to reset the voltage value, The capacitor voltage value at the voltage detection time Tm is measured and when the measured voltage value is equal to or greater than the first reference value as in the first waveform 100 shown in the figure, the number of bills passing through the conveyance path is determined to be zero.

If the capacitor voltage measured at the voltage detection point Tm is equal to or smaller than the first reference value and equal to or greater than the second reference value as in the second waveform 200 shown in the figure, If the measured capacitor voltage value at the time point Tm is equal to or less than the second reference value as in the third waveform 300 in the figure,

As described above, in the method of detecting the number of bills using the charging / discharging voltage value of the ultrasonic sensor according to the present invention, a capacitor is connected to the receiving side of the ultrasonic sensor for detecting the passage of bills on the conveying path, A signal voltage is applied to the capacitors at a certain point of time after discharging to detect whether or not the banknote passes on the conveying path by using a capacitor voltage value charged to the capacitor by a signal, By comparing the charging voltage with a preset reference voltage, it is possible to effectively determine whether 0, 1, or 2 sheets of paper money pass through the transport path.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be obvious to those who have knowledge of.

40:
50: Ultrasonic transmitter
60: Ultrasound receiver
70: Capacitor

Claims (8)

A capacitor is connected to the receiving side of the ultrasonic sensor for detecting whether or not the banknotes pass through the conveying path and the number of banknotes passing through the conveying path is detected by using the capacitor voltage value charged in the capacitor by the ultrasonic signal received by the receiving unit In the method,
When the input of the banknote is detected, the ultrasonic wave is emitted from the ultrasonic wave transmitter, and the capacitor is discharged to reset the voltage value. Then, the voltage value charged in the capacitor is measured at the preset constant voltage detection point Tm And detects whether the number of bills passing through the conveyance path is zero, one or two, by comparing the measured voltage value with a preset first reference value and a second reference value, A method of detecting the number of used paper currency. The method according to claim 1,
In setting the first reference value,
The ultrasonic receiving unit may discharge the capacitor to reset the voltage value and then emit ultrasonic waves from the ultrasonic wave transmitting unit in an initial state in which the passing banknote is not present at all and the saturation of the capacitor due to the signal received by the ultrasonic receiving unit, And a value of 85% to 95% of the measured saturation voltage value is set as a first reference value. A method for detecting the number of bills using the charge / discharge voltage value of an ultrasonic sensor. 3. The method of claim 2,
In setting the second reference value,
A capacitor connected to the ultrasonic receiving unit is discharged to reset the voltage value and then the saturation voltage value of the capacitor due to the noise signal received by the ultrasonic receiving unit is measured in a state in which the ultrasonic transmitting unit is not operated, Wherein the voltage value of the banknote is set to a second reference value. The method according to claim 1,
The voltage detection time (Tm)
The charging voltage value of the capacitor due to the signal received by the ultrasonic wave receiving unit is charged in the initial state in which the ultrasonic wave is discharged from the ultrasonic wave emitting unit and the passing banknote is not present at all after discharging the capacitor connected to the ultrasonic wave receiving unit, Wherein a saturation point is measured repeatedly and an average value of the saturation points measured is set to a capacitor voltage detection point (Tm). A method for detecting the number of bills using the charge / discharge voltage value of an ultrasonic sensor. 5. The method of claim 4,
The voltage detection time (Tm)
And after 80 to 100 占 퐏 have elapsed after the reset, the charging / discharging voltage value of the ultrasonic sensor is used. 3. The method of claim 2,
In determining the number of bills passing through the transport path,
The voltage value of the capacitor is measured at a set voltage detection time Tm and when the measured voltage value is equal to or greater than the first reference value, it is determined that the bills passing through the conveyance path are zero sheets. A method of detecting the number of used paper currency. The method of claim 3,
When judging one piece of paper money passing through the conveyance path,
The voltage value of the capacitor is measured at the set voltage detection time Tm and it is determined that the banknote passing through the conveyance path is one sheet when the measured voltage value is equal to or lower than the first reference value and equal to or higher than the second reference value A method for detecting the number of bills using the charge / discharge voltage value. The method of claim 3,
In determining two sheets of paper money that pass through the conveyance path,
Wherein a voltage value of the capacitor is measured at a set voltage detection point Tm and if the measured voltage value is equal to or less than the second reference value, it is determined that the number of bills passing through the conveyance path is two. A method of detecting the number of used paper currency.
KR1020140095088A 2014-07-25 2014-07-25 Method for detecting number of transferring banknotes using capacitor charged voltage of ultrasonic sensor KR20160013483A (en)

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KR1020140095088A KR20160013483A (en) 2014-07-25 2014-07-25 Method for detecting number of transferring banknotes using capacitor charged voltage of ultrasonic sensor

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KR20160013483A true KR20160013483A (en) 2016-02-04

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