JPH0444988B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a device for detecting various elements of banknotes and identifying authenticity.

[Prior Art] Generally, as this type of device, one having a circuit configuration shown in FIG. 4 is conventionally known.

A conventional banknote identification operation will be explained based on FIG. 4.

Sensors 1 and 2 that detect magnetic ink, etc. on banknotes
The weak signal detected from the is converted into a digital value, and the CPU (Central Processing Unit) 9
sent to. For example, the CPU 9 reads this digital value and stores it in the RAM every time it counts a certain number of clocks from the reference clock generating means 12 using a tachometer generator or the like attached to the banknote conveyance motor, that is, at each end of the identification zone.
10 and reset the integrators 5 and 6.

After the banknote passes through sensors 1 and 2,
CPU9 has 1 and 2 stored in RAM10
Data for each zone detected by and ROM1
The authenticity of the inserted banknote is determined by comparing it with upper and lower limit set values (reference pattern) stored in advance in 1.

[Problem to be solved by the invention]

In this method, the distribution of detected components (such as magnetic ink) differs depending on the denomination and insertion direction, but zones are divided at regular intervals for any denomination or insertion direction. Therefore, in FIG. 5, the characteristic elements of the distribution of the detected components of the banknote are detected across two zones as shown in zones Z2 and N3, or as shown in zone Z4 in FIG. If the characteristic element of the distribution of the detected component of the banknote is narrower than the width of the zone, the output value of the integrator will not be sufficient, and there will be no margin for determining the presence or absence of the characteristic element of the banknote, or if the banknote is dirty. There has been a problem in that it is difficult to distinguish characteristic elements from unnecessary outputs caused by such methods.

In view of the above-mentioned points, the present invention provides a conveying means for conveying inserted banknotes, a reference clock generation means for generating a reference clock according to the amount of movement of the conveyed banknotes, and a clock for identifying the banknotes from the conveyed banknotes. In a banknote identification device equipped with a sensor means for detecting data, data for banknote identification is subdivided and detected in the transport direction, and this detected data is used to identify characteristic elements corresponding to the denomination and insertion direction of the banknote to be identified. It is an object of the present invention to provide a banknote identification device that can reliably identify characteristic elements of banknotes to be recognized by dividing the banknotes into zones according to their positions.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a detection data storage means for sequentially storing detection data of a sensor means every time a reference clock is generated, and a banknote for identifying the detection data stored in the detection data storage means. a calculation means that divides into a plurality of zones according to the position of the characteristic element corresponding to the denomination and the insertion direction, and performs a predetermined calculation based on the plurality of detection data in each zone; The present invention is characterized by comprising an identification means for identifying the conveyed banknote by comparing it with identification reference data for each zone set corresponding to the denomination and insertion direction of the banknote to be recognized.

[Effect]

In the present invention, the detection data storage means stores the detection data of the sensor means at each position subdivided in the conveyance direction according to the generation interval of the reference clock.

The calculation means divides this detected data into zones according to the denomination of the banknote to be identified and the position of the characteristic element corresponding to the insertion direction, so that the calculation result of a predetermined calculation based on the detected data in the zone is calculated. will accurately indicate the identification data of the feature element, and by comparing this calculation result with the identification reference data, the feature element can be reliably identified.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1 shows the circuit configuration of an embodiment of this invention.

In FIG. 1, weak signals detected from sensors 1 and 2 that detect magnetic ink etc. on banknotes are as follows:
Amplified to a predetermined level by amplifiers 3 and 4,
The signal is converted into direct current by capacitors 13 and 14 and full-wave rectifier circuits 15 and 16, passed through multiplexer 7, and converted into a digital value by A/D converter 8. Note that the full-wave rectifier circuits 5, 6 and capacitors 13, 14 are for converting the AC signals obtained as the outputs of the amplifiers 3, 4 into DC signals. In the case where capacitors 13 and 1
4 is unnecessary.

The CPU 9 generates a clock corresponding to the amount of movement of the banknote obtained from the reference clock generating means 12.
Read the A/D converted digital value result,
Store to RAM10. The banknote is sensor 1,
2, the CPU 9 reads the data for each reference clock of each sensor stored in the RAM 10 and the zone information for each denomination stored in advance in the ROM 11, such as the start position of each zone for identification. Calculations are performed based on the determined top address and bytes corresponding to the width of each identified zone to obtain the average value, etc. of each zone. The calculation result is compared with the above-mentioned zone information and a pair of upper and lower limit set values to determine the authenticity of the banknote.

The ROM 11 stores (denomination type) x (number of directions) tables of the above-mentioned zone information and setting values shown in FIG. Referring to the table, the banknote identification judgment is proceeded, and if the error exceeding the set value is less than or equal to the allowable number, the banknote identification for that denomination and direction is passed. If the number of errors exceeds the allowable number, the next denomination or direction table is referred to for determination. In this way, banknote identification is determined for all tables, and if there is no passed denomination, the inserted banknote is identified as fake.
Also, if the test passes for two or more denominations, it is considered false.

Therefore, even though (number of denominations)×(number of directions) types of banknotes are to be identified, it is sufficient to provide the minimum number of detection sensors, amplifiers, and integrators necessary. Figure 2A shows the banknote discrimination procedure in this embodiment.
Shown below.

In FIG. 2A, identification data detected from a banknote to be identified is stored in RAM 10.

In step S1, the CPU 9 calculates the number of bytes n, which is the zone width of zone 1 shown in FIG.
Take it out. Step S2 is the final judgment of reading the zone information, and if the number of bytes n=0, the number of bytes n is set to "0" as an end code in the zone information of the ROM 11, the process proceeds to step S3. If the number of bytes is not 0, proceed to step S6.

In step S6, first, the address of the RAM 10 storing the banknote detection data at the starting position of zone 1 is read from the ROM 11 to the CPU 9. Next, in step S7, the detected data is read from the designated address of the RAM 10. In step S8, the cumulative total of the detected data is calculated. step
In S9, update the read position to the next address of the read address.

In step S10, it is determined whether or not reading of the detected data in the reading zone has been completed, that is, whether n bytes have been completed. If not, the process returns to step S7 and the cumulative total of the detected data is repeated. If n bytes have been completed, proceed to the next step.
In S11, the addition result is divided by the number of bytes n to obtain the average detected data in one zone. In step S12, the detected data average is
It is determined whether the value is within the range of the upper limit set value and lower limit set value stored in the ROM 11. If the detected data average is within the set range, the process returns to step S1. If the detected data average is not within the set range,
Add one error number and return to step S1.

When the above procedure is repeated a number of times (number of denominations) x (number of insertion directions), that is, the number of zones stored in the ROM 11, it is determined in step S2 that reading is complete, and the process proceeds to step S3. Step S3
Then, it is determined whether the number of errors is within the allowable range, and if the number of errors is within the allowable range, the denomination and insertion direction of the banknotes to be identified are confirmed in step S4, and the pass flag is set to, for example, "1". Set and proceed to step S5.

If the number of errors is not within the allowable range in step S3, the process advances to step S5. Here, the flag is set to "0".

In step S5, it is determined whether or not all the banknotes to be recognized have been checked. If not, the process returns to step S1 to re-identify the banknotes; if the checks have been completed, the process proceeds to step S21. Step S21,
In S22, the number of pass flags is determined, and if the pass flag is not 1, the banknote is determined to be fake, and the banknote return process is performed.

When the pass flag is 1, it is determined that the banknote is genuine, and the identification process ends.

FIG. 3 shows the zone division of banknotes according to this embodiment,
The relationship with the detection output described above is shown.

In FIG. 3, curve a represents the detected component due to dirt, and curves b, c, and d represent the characteristic portions of the detected component of the banknote to be identified. In this example, as shown in FIG. 3, b,
Since the zone width can be set to the effective width of c and d, banknote identification accuracy is increased, and the zone width of other zones Z1, Z3, Z4, and Z6 is greater than the zone width of zones Z2, Z4, and Z6 of the detected component characteristic part. Since the zone width can be made longer, for example, even if detected components are distributed due to dirt in a specific location shown in curve a in zone Z1, the average detection output of the detected components in zone Z1 will be small. It is possible to perform banknote identification with less influence.

〔Effect of the invention〕

According to the present invention as described above, the detection data storage means sequentially stores the detection data of the sensor means every time the reference clock is generated, and the detection data stored in the detection data storage means is used to store the denomination of the banknote to be identified. Calculating means that divides into a plurality of zones according to the position of the characteristic element corresponding to the species and the insertion direction, and performs a predetermined calculation based on the plurality of detection data in each zone;
An identification means is provided to compare the calculation result of the calculation means with identification standard data for each zone set corresponding to the denomination and insertion direction of the banknote to be identified, and to identify the transported banknote, and the detection for banknote identification is provided. By detecting data by subdividing it in the transport direction, and dividing this detected data into zones according to the denomination of the banknote to be identified and the position of the characteristic element corresponding to the insertion direction, the characteristic elements of the banknote to be identified are reliably detected. Even if there are many denominations and insertion directions of banknotes to be identified, it is easy to divide the banknotes into optimal zones according to the type, making the identification easy and reliable. It can be carried out.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a configuration example of an embodiment of the present invention, FIG. 2A is a flowchart of the determination section of the embodiment of the present invention, and FIG. 2B is an explanation of the determination table of FIG. 2A. 3 are explanatory diagrams showing an example of zone division and output values according to an embodiment of the present invention. Fourth
The figure is a block diagram of a conventional identification device, and FIG. 5 is an explanatory diagram showing an example of zone division and output values by a conventional identification device. 1, 2...Sensor, 3, 4...Amplifier, 5, 6...Integrator , 7... multiplexer, 8... A/D converter,
9...CPU, 10...RAM, 11...ROM, 12...
Clock generation means, 13, 14... Capacitor, 1
5, 16...Full wave rectifier.

Claims (1)

[Scope of Claims] 1. Conveying means for conveying inserted banknotes, reference clock generating means for generating a reference clock according to the amount of movement of the conveyed banknotes, and detecting data for identification from the conveyed banknotes. A banknote identification device comprising: a detection data storage means for sequentially storing detection data of the sensor means every time the reference clock is generated; and a detection data storage means for identifying the detection data stored in the detection data storage means. a calculation means that divides the banknote into a plurality of zones according to the denomination of the banknote and the position of the characteristic element corresponding to the insertion direction, and performs a predetermined calculation based on the plurality of detection data in each zone; and the calculation of the calculation means. A banknote identification device comprising: an identification unit that identifies the conveyed banknote by comparing the result with identification reference data for each zone set corresponding to the denomination and insertion direction of the banknote to be identified. 2. In the device according to claim 1,
A banknote identification device, wherein the calculation means performs an arithmetic mean calculation of a plurality of detection data in each zone.