KR20100044593A - Output value compensation method and apparatus for medium recognition sensor - Google Patents

Abstract

PURPOSE: A method and an apparatus for compensating the output value of a media recognition sensor are provided to prevent the media recognition rate from reducing due to a temperature change by maintaining the output value of the media recognition sensor regardless of the temperature change. CONSTITUTION: At least one media recognition sensor(102) recognizes a media. A sensor(104) senses the temperature around the media recognition sensor. A control unit(110) controls the output value of the media recognition sensor based on the sensed temperature change. A storage unit(108) stores the output value as a compensation reference value. The control unit controls the output value of the media recognition sensor based on the compensation reference value.

Description

Output Value Compensation Method and Device of Media Recognition Sensor {OUTPUT VALUE COMPENSATION METHOD AND APPARATUS FOR MEDIUM RECOGNITION SENSOR}

The present invention relates to a medium recognition sensor, and more particularly, to a method and apparatus for compensating an output value of a medium recognition sensor for compensating an output value of a medium recognition sensor according to a temperature change.

The media represent banknotes, checks, papers, tickets, certificates, and the like, and the media are very thin in thickness and length.

In the present embodiment, a banknote will be described as an example. Banknote recognition is important in various devices that use bills, such as ATMs, automated teller machines (ATMs), cash dispensers (CDs), vending machines, and currency exchangers. This is because if a bill is misrecognized and a fake bill is mistaken for a normal bill, it is a big problem. In addition, it is necessary to recognize whether the banknotes are broken or not.

The banknote recognition may be made by a person skilled in the art, but the financial automatic machine using the banknote should be able to recognize the banknote itself. To this end, various types of banknote recognition sensors are installed in the automatic teller machine to recognize bills in an optimal state.

Most bill recognition sensors, however, operate sensitively to ambient temperature. In other words, the bill recognition sensor has an optimal bill recognition rate when the ambient temperature of the place where the bill recognition sensor is installed is room temperature (for example, 15 ° C. to 25 ° C.), but the bill recognition rate decreases at other temperature conditions. An error of recognition occurs. This is because the output value of the banknote recognition sensor outputs differently depending on the temperature.

Therefore, an IC (Integrated Circuit) chip capable of minimizing fluctuations in the banknote recognition sensor may be mounted on the banknote recognition device, but the IC chip may also be affected by temperature changes. In this case, when the bill recognition device is installed in an area or outside where the temperature difference is severe, the recognition value of the bill recognition sensor is added to the bill and the recognition rate of the bill cannot be effectively prevented.

In addition, an optical sensor employing a light emitting element (LED) may be used as a bill recognition sensor. However, the LED is characterized in that the efficiency is lowered as the temperature rises. Therefore, in order to use the optical sensor, a compensation circuit for compensating the banknote recognition rate according to the temperature rise has to be added separately. Without the compensation circuit, it is difficult to accurately determine the authenticity of banknotes.

That is, the conventional banknote recognition sensor does not effectively cancel the decrease of the banknote recognition rate due to the temperature change. Accordingly, when the temperature of the place where the banknote recognition device equipped with the banknote recognition sensor is severely changed or when the ambient temperature of the banknote recognition sensor changes according to the temperature change inside the banknote recognition device, the banknote recognition sensor may be configured as a bill. It was not possible to accurately determine the authenticity, the damage, and the discrimination.

Therefore, an object of the present invention is to solve the above problems, to compensate for the output value of the recognition sensor according to the temperature change to be output.

Another object of the present invention is to prevent the degradation of media recognition performance.

According to a feature of the present invention for achieving the above object, at least one medium recognition sensor for recognizing a medium; A sensor for sensing an ambient temperature of the medium recognition sensor; And, it comprises a control unit for controlling the output value of the medium recognition sensor in accordance with the change in temperature detected by the detection sensor.

And a storage unit which stores in advance a compensation value for changing the output value of the media recognition sensor to a reference output value, wherein the controller controls the output value of the media recognition sensor according to the compensation value. Here, the reference output value refers to an output value at room temperature of the media recognition sensor.

The output value of the medium recognition sensor is an output current of the medium recognition sensor.

A calculation unit calculating a voltage value of the detection sensor according to a change in the ambient temperature of the medium recognition sensor; And an analog / digital converter configured to analog-digital convert the calculated voltage value, wherein the analog-digital converted value is ambient temperature information of the media recognition sensor sensed by the sensor.

According to another aspect of the present invention, there is provided a financial automatic device having an output value compensation device of the media recognition sensor, the financial automatic device compensates the output value of the media recognition sensor even if the ambient temperature of the media recognition sensor changes To recognize the medium.

According to another feature of the invention, the sensing step of sensing the ambient temperature of the medium recognition sensor that the temperature sensor recognizes the medium; A compensation step of compensating an output value of the medium recognition sensor by the changed temperature change amount when a reference temperature set so that the medium recognition sensor can recognize the medium in an optimal state is changed; And an output step of outputting the compensated output value.

Creating a temperature table in which temperature data for each temperature of the temperature sensor is stored; And storing each output value output from the media recognition sensor in the temperature table when the media recognition sensor output value output from the reference temperature and the ambient temperature of the media recognition sensor are changed. In the compensation, the output value output in the state where the temperature is changed is compensated by the optimum output value at the reference temperature.

The temperature table further stores a compensation control value for compensating the output value of the medium recognition sensor, and when the ambient temperature of the medium recognition sensor changes, the output value of the medium recognition sensor is converted into a compensation control value corresponding to the temperature change amount. To compensate.

The compensated output value is output in the same manner as the output value of the medium recognition sensor output at the reference temperature.

The output value compensation controls the current value flowing through the media recognition sensor or controls the output gain of the media recognition sensor.

In the present invention, after initializing the media recognition sensor at room temperature (15 ℃ ~ 25 ℃), which is the best temperature for the medium recognition rate, and stores the output value, and outputs the output value when varying the ambient temperature of the media recognition sensor In the stored state, if the ambient temperature of the media recognition sensor changes when the media recognition sensor is driven, the output value output from the media recognition sensor is compensated for by the output value in the initialization state. Output compensation adjusts the current flowing through the media recognition sensor or controls the output gain. Thus, the medium recognition sensor outputs a constant output value regardless of the temperature change, thereby preventing the medium recognition rate from decreasing according to the temperature change.

Hereinafter, a method and an apparatus for compensating an output value of a media recognition sensor according to the present invention will be described in detail with reference to a preferred embodiment shown in the accompanying drawings. In the present embodiment, a banknote recognition apparatus for recognizing banknotes will be described as an example.

1 is a block diagram of an output value compensation device of a banknote recognition sensor according to a preferred embodiment of the present invention.

Referring to Figure 1, the output value compensation device 100 of the banknote recognition sensor is provided with a banknote recognition sensor 102 for recognizing the banknote. The banknote recognition sensor 102 is a sensor for recognizing banknotes by checking the paper type discrimination, authenticity, damage, inclination, etc. of various banknotes inserted into the banknote recognition device, and at least one sensor on a banknote conveying path. Is installed. The bill recognition sensor 102 may include a color sensor, an ultra violet sensor, an infrared ray sensor, a contact image sensor (CIS), a magnetoresistive element (MR) sensor, and the like. In the bill recognition device, a sensor of a type corresponding to the bill recognition method in the bill recognition device is selected and installed. Of course, two or more types of sensors may be installed in combination. The bill recognition sensor 102 will be described as a constant output value in the room temperature temperature range (15 ℃ ~ 25 ℃) to be described below. The banknote recognition sensor 102 recognizes the banknote accurately at room temperature. Of course, the temperature range may vary depending on the characteristics of the banknote recognition sensor 102. In addition, when the ambient temperature in which the banknote recognition sensor 102 is installed changes, the output value changes as much as the changed value. When the output value changes, the bill recognition rate also decreases. Therefore, the output value of the banknote recognition sensor 102 should be constantly output. Hereinafter, the output value of the banknote recognition sensor 102 at the room temperature will be described as 'optimal output value P'. The optimum output value is an output value in a room temperature temperature range (15 ° C. to 25 ° C.), and is a value at which the recognition rate of a bill can be optimized.

The temperature sensor 104 for sensing the ambient temperature is installed the banknote recognition sensor 102 is provided. The temperature sensor 104 is installed equal to the number of the banknote recognition sensor 102. However, when a plurality of banknote recognition sensors are adjacent to each other and the ambient temperature of the adjacent banknote recognition sensors can be accurately detected as one temperature sensor, the temperature sensor may be provided less than the banknote recognition sensor. The temperature sensor 104 directly detects the ambient temperature of the bill recognition sensor 102 and provides it as temperature data, or according to a change in the ambient temperature of the bill recognition sensor 102, the voltage of the temperature sensor 104. You can calculate the value and provide the converted value as temperature data. For example, when a thermistor is used as the temperature sensor 104, since the resistance value of the thermistor changes according to temperature change, the voltage value can be calculated using the resistance value, and the voltage value is used as temperature data. It can be used as. To this end, a calculation unit 105 for calculating a voltage value of the temperature sensor 104 and an analog / digital conversion unit 106 for analog-to-digital conversion of the calculated voltage value are provided. And the temperature range in this embodiment will be described separately for high temperature, room temperature and low temperature for convenience of description. In general, the room temperature refers to 15 ℃ ~ 25 ℃, the high temperature is a temperature higher than the above room temperature here, the temperature above 25 ℃, the low temperature is below the room temperature and here describes a temperature below 15 ℃.

When the ambient temperature of the banknote recognition sensor 102 changes from the normal temperature to the high or low temperature state, a measurement unit 107 is provided to measure the output value of the banknote recognition sensor 102. The output value at this time is a state in which there is a change amount by the predetermined range with the optimum output value P.

The ambient temperature of the banknote recognition sensor 102 and the respective output values of the banknote recognition sensor 102 when the temperature is changed, that is, the optimum output value P when the banknote recognition sensor 102 is room temperature, and A storage unit 108 is provided for storing the first output value P ′ and the second output value P ″ when the banknote recognition sensor 102 has a high temperature and a low temperature. Tables are stored according to respective temperatures, namely, high, normal, and low temperatures of 104. An example of data stored in the storage unit 108 is shown in Table 1 below.

TABLE 1

Ambient temperature of bill recognition sensor Output value of bill recognition sensor High temperature P ' Room temperature P Low temperature P "

The controller 110 is provided to compensate for the first and second output values P ′ and P ″ of the banknote recognition sensor 102 to be the optimum output value P according to the temperature change. When the bill 102 is normally driven and the bill is recognized, when the ambient temperature sensed by the temperature sensor 104 is changed to a high temperature or a low temperature, the first output value P ′ of the bill detection sensor 102 at a high temperature state is changed. Or the second output value P ″ of the bill recognition sensor 102 in the low temperature state to be the optimum output value P, and the compensated optimum output value P is output.

Next, the process of compensating the output value of the bill recognition sensor in the output value compensation device of the bill recognition sensor configured as described above, and a method of recognizing the bill by the compensated output value will be described.

2 is a flowchart illustrating a control process for compensating an output value of a banknote recognition sensor for banknote recognition according to an exemplary embodiment of the present invention.

First, the controller 110 creates a temperature table of high temperature, room temperature, and low temperature, and stores the temperature table in the storage unit 108 (s100). Then, in step 102, the output values P, P ', and P "of the bill recognition sensor 102 are stored in the temperature table. To this end, the bill recognition sensor 102 is initialized at a room temperature. The initialization means that the bill recognition sensor 102 is operated in an optimal state, and minimizes the deviation of various sets (for example, automated teller machines) in which the bill recognition sensor 102 is installed. The controller 110 stores the output value P of the banknote recognition sensor 102 in the storage unit 108. When the ambient temperature is changed to a high temperature or a low temperature state, the controller 110 ) Receives the first and second output values P ′ (P ″) of the banknote recognition sensor 102 measured by the measurement unit 106 and stores them in the storage unit 108. The stored state is shown in Table 1 described above.

As described above, in the state where the output values P, P 'and P "are stored for each temperature in the storage unit 108, a bill input command is generated from the user and the bill is input to the bill recognition device (s104). The bill recognition sensor 102 starts to be transferred through the transfer path so as to recognize the bill (s106).

When the bill is transferred, the temperature sensor 104 detects the ambient temperature of the bill recognition sensor 102 (s108). In the following description, the ambient temperature is divided into room temperature, high temperature, and low temperature.

This is the case where the sensed temperature is room temperature (s110). That is, when the banknote recognition sensor 102 operates within a range of 15 ° C. to 25 ° C., the banknote recognition sensor 102 has an optimum value P for banknote recognition. It is not necessary to compensate the output value of the banknote recognition sensor 102. Accordingly, the banknote recognition sensor 102 outputs an output value P currently output (s112), and recognizes the banknote as the output value P (s120).

The detected temperature is a high temperature (s114). In other words, the bill recognition sensor 102 is operating in a condition exceeding 25 ℃. In this case, the first output value P 'of the banknote recognition sensor 102 is different from the optimum output value P when the banknote recognition sensor 102 is at room temperature. In this case, the banknote recognition rate is lowered, and the banknote is not normally recognized. Accordingly, the controller 110 reads table information from the storage 108. And the control unit 110 controls the output value of the bill recognition sensor 102 so that the first output value (P ') of the bill recognition sensor 102 is the optimal output value (P) of the bill recognition sensor 102 ( s116). The output value control is to adjust the current value flowing through the banknote recognition sensor 102, or to control the output gain of the banknote recognition sensor 102. In such a case, the first output value P ′ of the banknote recognition sensor 102 is compensated and output in the same manner as the optimum output value P of the banknote recognition sensor 102 at room temperature. Therefore, even if the ambient temperature of the banknote recognition sensor 102 is changed to a high temperature, the banknote recognition rate is not lowered and the banknote can be recognized normally (S120).

The sensed temperature is a low temperature (s118). In other words, the bill recognition sensor 102 is operating under the condition of less than 15 ℃. Also in this case, as in the high temperature state, the second output value P ″ of the banknote recognition sensor 102 is different from the optimum output value P when the banknote recognition sensor 102 is at room temperature. Therefore, the controller 110 reads table information from the storage unit 108. The controller 110 has a second output value P ″ of the banknote recognition sensor 102 as the banknote. The output value of the banknote recognition sensor 102 is controlled to be the optimum output value P of the recognition sensor 102 (s119). The output value control is to adjust the current value flowing through the banknote recognition sensor 102, or to control the output gain of the banknote recognition sensor 102. In this case, the second output value P ″ of the banknote recognition sensor 102 is compensated and outputted in the same manner as the optimum output value P of the banknote recognition sensor 102 in a normal temperature state. Even when the ambient temperature of the banknote recognition sensor 102 becomes low, the banknote recognition rate is not lowered and the banknote can be recognized normally (S120).

On the other hand, if the banknote is not inserted in step 104, it maintains the standby state (s130).

In the above example, the temperature information of the temperature table stored in the storage unit 108 is temperature information directly detected by the temperature sensor 104 or the calculation unit 105 according to the resistance value change of the temperature sensor 104. The A / D converter 106 converts the calculated voltage value into a digital value.

3 is a flowchart illustrating a control process for compensating an output value of a bill recognition sensor for bill recognition according to another embodiment of the present invention. In the embodiment of Figure 3 is to store the compensation control value necessary for the output value of the banknote recognition sensor in the high temperature or low temperature state to the optimum output value, by using this to compensate the output value of the banknote recognition sensor.

Referring to this, first, the temperature table created according to the temperature change of the temperature sensor 104 is stored in the storage unit 108 (s200). Then, various values are stored in the temperature table (s202). That is, the temperature table stores the conditions of high temperature, room temperature, and low temperature, and stores the output values P, P ', and P "of the bill recognition sensor 102 at each temperature. The first output value P' and The first compensation control value Q 'and the second compensation control value Q ", which are necessary compensation values so that the second output value P" becomes the optimum output value P, are stored. Q ') refers to a compensation value required for the first output value P' of the banknote detecting sensor 102 to be the optimum output value P in a high temperature state, and the second compensation control value Q "is a banknote in a low temperature state. The second output value P ″ of the sensing sensor 102 refers to a control value required to be the optimum output value P. This is shown in Table 2 below.

TABLE 2

Ambient temperature of bill recognition sensor Output value of bill recognition sensor Compensation control value High temperature P ' Q ' Room temperature P Low temperature P " Q '

As described above, while the output values P, P ', and P " and the compensation control values Q' and Q " are stored for each temperature in the storage unit 108, a bill input command is generated from the user and the bill is received in the bill recognition device. Is input (s204). Then, the inserted banknote starts to be transferred so that the banknote recognition sensor 102 can recognize the banknote (S206).

When the bill is transferred, the temperature sensor 104 detects the ambient temperature of the bill recognition sensor 102 (S208). The ambient temperature will be described by dividing the room temperature, high temperature, low temperature.

This is the case where the sensed temperature is room temperature (s110). That is, when the banknote recognition sensor 102 operates within a range of 15 ° C. to 25 ° C., the banknote recognition sensor 102 has an optimum value P for banknote recognition. It is not necessary to compensate the output value of the medium recognition sensor 102. Accordingly, the banknote recognition sensor 102 outputs an output value P currently output (S212), and recognizes the banknote as the output value P (s220).

The detected temperature is a high temperature (s214). In other words, the bill recognition sensor 102 is operating in a condition exceeding 25 ℃. In this case, the first output value P 'of the banknote recognition sensor 102 is different from the optimum output value P when the banknote recognition sensor 102 is at room temperature. In this case, the banknote recognition rate is lowered, and the banknote is not normally recognized. Therefore, the controller 110 reads the first compensation control value Q 'from the storage 108. In addition, the controller 110 controls the output value of the banknote recognition sensor 102 by the read first compensation control value Q '(s216). That is, instead of directly controlling the output value as in the above-described embodiment, the compensation control value for controlling the output value is stored in advance, and the output value of the banknote recognition sensor 102 is controlled as the compensation control value. Then, the output value P 'of the banknote recognition sensor 102 is compensated and output in the same manner as the optimum output value P. Therefore, even when the ambient temperature of the banknote recognition sensor 102 is changed to a high temperature, the banknote recognition rate is not lowered and the banknote can be recognized normally (S220).

The sensed temperature is a low temperature (s218). In other words, the bill recognition sensor 102 is operating under the condition of less than 15 ℃. Also in this case, as in the high temperature state, the second output value P ″ of the banknote recognition sensor 102 is different from the optimum output value P when the banknote recognition sensor 102 is at room temperature. In this state, the banknote cannot be recognized normally, and therefore, the controller 110 reads the second compensation control value Q ″ from the storage unit 108. The controller 110 controls the output value of the banknote recognition sensor 102 by the first compensation control value Q ″ which is read. Then, the output value P ″ of the banknote recognition sensor 102 is an optimum output value ( The output is compensated in the same way as P). Therefore, even when the ambient temperature of the banknote recognition sensor 102 becomes low due to a change in temperature, the banknote recognition rate is not lowered and the banknote can be recognized normally (S220).

On the other hand, if the banknote is not inserted in step 204, and maintains the standby state (s230).

As described above, according to the present embodiment, even if the ambient temperature of the banknote recognition sensor 102 changes, the value output from the banknote recognition sensor 102 is compensated by an output value capable of making the banknote recognition optimal. It can be seen that the bill can be accurately recognized.

Although described with reference to the illustrated embodiment of the present invention as described above, this is merely exemplary, those skilled in the art to which the present invention pertains various modifications without departing from the spirit and scope of the present invention. It will be apparent that other embodiments may be modified and equivalent. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a block diagram of an output value compensation device of the banknote recognition sensor in accordance with a preferred embodiment of the present invention.

2 is a flow chart of a control process for output value compensation of the banknote recognition sensor for banknote recognition according to an embodiment of the present invention.

3 is a flowchart of a control process for output value compensation of a bill recognition sensor for bill recognition according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

102: bill recognition sensor 104: temperature sensor

105: arithmetic unit 106: A / D conversion unit

107 measurement unit 108 storage unit

110: control unit

Claims (10)

At least one medium recognition sensor for recognizing a medium; A sensor for sensing an ambient temperature of the medium recognition sensor; And, And a control unit for controlling an output value of the medium recognition sensor according to a change in temperature sensed by the detection sensor. The method of claim 1, And a storage unit which stores in advance a compensation value for changing the output value of the media recognition sensor to a reference output value. And the control unit controls the output value of the media recognition sensor according to the compensation value. The method according to claim 1 or 2, And an output value of the medium recognition sensor is an output current of the medium recognition sensor. The method of claim 1, A calculator configured to calculate a voltage value of the sensor according to a change in the ambient temperature of the medium recognition sensor; And, And an analog / digital converter configured to analog-digital convert the calculated voltage value. And the analog / digital converted value is ambient temperature information of the medium recognition sensor sensed by the detection sensor. Provided is an automatic teller machine comprising an output value compensating device of a medium recognition sensor according to any one of claims 1 to 4, The automatic teller machine recognizes the medium by compensating the output value of the medium recognizer even when the ambient temperature of the medium recognizer changes. A sensing step of sensing an ambient temperature of the medium recognition sensor for recognizing the medium by the temperature sensor; A compensation step of compensating an output value of the medium recognition sensor by the changed temperature change amount when a reference temperature set so that the medium recognition sensor can recognize the medium in an optimal state is changed; And, And an output step of outputting the compensated output value. The method of claim 6, Creating a temperature table in which temperature data for each temperature of the temperature sensor is stored; And, And storing each output value output from the medium recognition sensor in the temperature table when the medium recognition sensor output value output from the reference temperature and the ambient temperature of the medium recognition sensor change. And compensating the output value output in the state where the temperature is changed to the optimum output value at the reference temperature when compensating the output value. The method of claim 7, wherein the temperature table, Compensation control value for compensating the output value of the medium recognition sensor is further stored, And if the ambient temperature of the medium recognition sensor changes, compensating the output value of the medium recognition sensor with a compensation control value corresponding to the temperature change amount. The method according to any one of claims 6 to 8, The compensated output value is the output value compensation method of the medium recognition sensor, characterized in that the same as the output value of the medium recognition sensor output at the reference temperature. The method of claim 9, The output value compensation method of compensating the output value of the medium recognition sensor, characterized in that to adjust the current value flowing through the medium recognition sensor, or to control the output gain of the medium recognition sensor.

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