TW306995B - - Google Patents

Description

A7 B7 V. Description of the invention (1 / This case is about the characteristics of a hard kidney, a substitute belt or other flat metal objects, such as the object and type of the device, such as the description of the scope of the patent application. This device is suitable for such as public telephones, Collecting stations for vending machines, electric meters, etc.,! Try to see the solid installation of the coins with the characteristics described in item I of U Lee Wai, which can be found in EP 304 535 B1. The device contains three sensors that can operate independently of each other The sensor determines the thickness, alloy composition and direct control of the hard kidney to be tested. The structure of the three inductive sensors is like a double coil, which is located on both sides of the coin channel and is connected in parallel or _ in a circuit The form, so that the measurement of the scattering caused by the jump of the coin in the coin channel can supplement its change relative to the position of the side wall of the coin channel or the jump from the bottom of the coin channel-mine. The disadvantage of using double coils is the alloy composition of the coin The thickness cannot be determined independently from each other. Each sensor is part of a parallel resonant circuit in which the deviation of the resonance frequency generated by the coin is measured and the quality change is measured. These parameters The change value measured in is used as a change criterion for coin exclusion or acceptance. Therefore, it is hoped that an inductive sensor can be constructed to determine the alloy composition by applying a simple coil, which only needs to be adapted to one side of the coin channel. Contains the operating frequency The coin detector of the inductive sensor at 3kHz to 1MHz is found in GB 1 397 083. The inductive sensor is placed in the resonant circuit and the bridge circuit. The resonant frequency when the coin appears is used as its money sign. In order to make the coin in The use of the energy absorbing element in the sensor area is only rolling without jumping. See GB 2 266 804 and German Utility Model G 90 13 836.8 ^ This energy absorbing element is preferably made of ceramics in a disc shape, which is placed in a coin In the channel, each coin inserted into the coin entrance can collide with it. The standard of this paper is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ297 mm), · 1 --------- f | Button clothing- ----, 1T ----- '^ (Please read the notes on the back before filling in the page) Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs Printed A7 ___ B7 V. Description of Invention (2) This The purpose of the Ming is to provide a device for testing the integrity of the coin, in which the metal composition and thickness of the coin can be independently determined from each other, and first of all, the jitter of the coin can be eliminated as much as possible, and then the residual jitter of the measurement scattering can be as The above objectives can be achieved by the features of items 1, 2 and 8 of the patent application scope of the present invention. Typical embodiments of the present invention will be described in detail below, and the reference application for coin M may also be used for tokens in the following Or other flat metal objects. Fig. 1 is the coin channel of the test device, Fig. 2 shows the cross section of the coin channel, Figs. 3 and 4 are the graphs of measuring Jun, --- Fig. 5 is the sensing signal, and Fig. 6 is the circuit. 1 Coin channel 2 Body 3 Bottom 4 '5 Lower and upper side wall 6 Cover 7 Rib 8 Recessed disc 9, 10 coil 11' 12 Metal disc 13 Switch 14 Circuit 15 Control and calculation sheet 17 Flat area 18 Differential amplifier 19 Switch input 20 non-turn & input 21 resistance 22 amplifier circuit 23 amplitude detector 24, 25 inverter 26 voltage divider 27, 28 capacitance of the paper standard Lai Zhongguan home transfer (CNS) Α4 specifications (2 | Qx 297 public ) One ----------!-Installed ------ order -----; line (please read the precautions on the back first and then fill in this page) 306995 Α7 Β7 5. Description of the invention r) 29, 30 resistance. Figure 1 is a device for testing the integrity of coins' tokens or other metal materials. It contains a coin channel 1, preferably a groove placed in the body 2, which consists of two plastic bodies. The coin passage 1 includes a bottom 3, upper and lower side walls 4 and 5, and a cover 6. The lower side wall 4 includes an integrally formed rib, which is parallel to the bottom 3 of the coin in the moving direction. The coin channel 1 is inclined to the moving direction of the test coin hard M, and the side walls 4 and 5 are inclined with respect to the vertical V-an acute angle of substantially 10 °, so that the test coin M can roll down along the bottom 3 of the coin channel 1 or Slide, and one side of the coin M is placed on the rib 7 of the lower side wall 4. The side walls 4 and 5 have grooves on the surface that does not face the coin channel 1 and can accommodate the coils 9 and 10. The coils are placed at different positions on the same axis and can be adapted to the metal disk 1 Γτ · 12 if necessary . The coil 9 and the disk 12 can be placed on the lower side wall 4, so they are indicated by broken lines in the figure. The groove is only shown in Figure 2. The discs 11, 12 can be placed on opposite sides of the coils 9 and 10, respectively. It is preferably circular or rectangular, but can also be of any desired geometric shape. In each case, the coil 9 or 10 and, if appropriate, the metal disc 11 or 12 are placed in the opposite side wall 5 or 4 to form an inductive inductor. The two coils 9 and 10 include two connections, one of which is connected to a common ground M, and the other to the switch π 'so that it can communicate with the circuit 14, and therefore can be electrically operated independently of each other. The device further includes a control and calculation unit 15, for example, in the form of a microprocessor, which uses the output signal provided by the calculation circuit 14 to control the child device. The circuit 14 and the microprocessor 15 are designed to make the difference between the measurement signals obtained from the coils 9 and 10 effective. This value indicates the measurement of the thickness of alloys and coins. If these values are within a predetermined range, Then the coin M is considered to be the real one and accepted, otherwise the coin M is excluded. Figure 2 The cross section of the coin passage 1 not at the level of the coil 10, the distance between the ribs 7′-6-f please. Yin- " Precautions on the back of the reading nasal filling of the winter cornel > Employee consumption cooperative printing and printing ------ \ -installation ------ ir ----- 1 # ----------------- employee of the Central Bureau of Standards of the Ministry of Economic Affairs Printed by the consumer cooperative V. Description of the invention (4 / distance is preferably 7.25 mm. The shape of the surface facing the coin part channel is cylindrical. The radius of curvature R is approximately equivalent to the interval a: Rsa. Slightly larger-point ruler The value (approximately equal to 8 mm) is the best. The rib 7 is naturally separated by a recess 16 with a depth of 0.5 mm. This recess 16 includes a flat region 17 whose maximum depth is between the rib 7 The minimum thickness of the side wall 4 at the groove 8 is selected based on the material properties of the body 2 and the material stress of the expected coin M. However, the radius of curvature R and the spacing a are irrelevant. The thickness is 0.6 mm, so that the stubborn distance between the coil 9 suitable for the groove 8 in the lower side wall 4 and the coin M rolled in an ideal manner is 1.1 mm. The rib 7 is also there to prevent moisture and hardness Unnecessary sticky Or crowded. The structure of the cylindrical surface with ribs 7 with a large radius of curvature R makes the distance between the lower side wall 4 and the hard wall M larger than the example of the ribs in the prior art. This makes it impossible for the coin M in a flat ideal position The impact generated by the lower side wall 4 has a relatively high damping, so the coin 10 at the coil areas 9 and 10 hardly jumps or jumps' even when the coin breaks and scratches or nicks occur. Coin M The degree of jumping and jumping can be suppressed by using the ribs 7 whose radius of curvature R is smaller than the interval a (such as only a / 2), which can be determined by testing. And the shape of the auxiliary part 7 is not like that of the cylinder. Rn Under impact The height of the coin M of the side wall 4 is higher than that of the conventional auxiliary part 7. Its miscellaneous t # 当 低 3. Another embodiment of the present invention includes a thin plate that is loosely fixed and the side wall 4 is parallel, instead of the coils 9 and 1. The rib 7 on the lower side wall 4 in the area. Compared with the mass of the test coin M, the mass of the plate is quite small and contains, for example, metal or ceramic. When the coin M collides with the disc, it can absorb its jump if necessary能 Τ '* -7- This paper music is suitable China National Standards (CNS) A4 specification (2 丨 OX297mm); —1 · It---—J _ batch of each ------_ ____f (please read the precautions on the back before filling this page) A7 A7

V. Description of the invention (The amount 'therefore produces a resistance effect. According to an embodiment of the present invention, in addition to the mechanical design to prevent coins from jumping and / or jumping, the improvement in measurement also includes measuring the coin M The important characteristics of the alloy composition and thickness of the alloy further reduce the impact of the remaining jump or jump. For simplicity, the following will use the reference symbol S to represent the coils 9 and 10. That is, the coil S represents one of the coils 9 or 10 Coil. Coil s can be determined by its inductance Ls and internal resistance Rs. It represents an inductive sensor. The combination of the above coil s and small plate 11 or] 2 represents another inductive sensor. When coin ^ 1 During the passage of the coil S, because of the physical effect between the coil s and the coin μ, use ls and Rs to temporarily change the "internal resistance Rs package-containing the static component Rs dc and the dynamic composition rs, ac (①), which is flowing through the coil The angular frequency of the current S of ω ′ is the physical property of the coin μ, the geometry of the coil S, and in particular the distance between the coil s and the coin M. Once the amount of coins M rolling along the coin path passes through the coil s Measuring area The resistance rs increases. Figure 5 is a graph of the change in time and internal resistance ° To avoid any influence of the diameter of the coin M on the thickness d and the alloy composition during the measurement, the diameter of the coil S can be selected to be smaller than the diameter of the smallest coin M tested. And the coil S can be placed on the side wall 4 or 5 'of the coin channel 1 at the corresponding position so that the shortest coin is completely covered with the coil S. The diameter of the coil S can be 14 mm. The resistance of the integrated line It is quite small. The wire-wound coil with a ferrite core is particularly suitable for the coils 9 'and 10. The assembly of the coils 9 and 10 as a single coil is only placed on one side of the coil channel 1 in each case and its complete Electrical separation can avoid the sensory leakage related to the double coil. S ** This paper scale is applicable to the Chinese National Standard (CNS) specifications (21〇X297mm) J -------- 1- Outfit-(please read the notes on the back first and then fill in the page to order the printed copy of the Ministry of Economic Affairs Central Standards Bureau Employee Consumer Cooperative Printed by the Ministry of Economic Affairs Central Standardization Bureau Employee Consumer Cooperative 306995 A7 f --- * ---__ B7 Description of the invention (6 ~~ " ---— Son Circuit 14 It is used to connect the coil S in the resonant circuit and provide an analog signal proportional to the internal resistance Rs of the coil S at the exit. When the coin μ passes through the measurement area of the coil S, the analog digital converter can be used by the microprocessor 15 Get the graph of the change of output No. 4 with time. Like the stored digital value and queen bee, the microprocessor 15 performs the detailed analysis described below, and the result can get two values, such as 1 and & This can be used to decide whether the coin M will be accepted or excluded. The coil 9 is located on the side wall 4 to move the contact point along the coin M, and the distance between the fixed coil 9 and the closest surface of the coin M, for example. The coin μ can use a single alloy or multiple Alloys. When the coin M appears, the measured internal resistance of the coil 9 'is approximately a function of the material of the coin M if the frequency% of the current through the coil 9 is appropriately selected. Fig. 3 shows the function of the internal resistance R9 and the thickness of the coin M, where the coin is made of different alloys LI, L2 and L3. During the measurement, the hard φMτ is placed in a symmetrical position in front of the coil 9. It can be seen from the figure that in fact the internal resistance Rg and the thickness d are provided for off. Therefore, the important characteristic variable using the coil 9 'coin µ can be completely eliminated using a simple method, and this characteristic variable is almost completely independent of its alloy or alloy composition. The space between the coil 10 and the coin M is a function of the thickness d. In the example of the coil 10, the internal resistance R10 is not only a function of the material of the coin M, but also a function of the thickness d. As shown in Fig. 4, for all "alloys l1, L2 and L3, the dependence of the thickness d is approximately linear in the range of interest. If the alloy of the coin μ is already known, the thickness d of the coin M can be very clear "Decision" Compared with the so-called double coil (the coil is placed on both sides of the coin channel 1 and is electrically connected or connected in series), two single coils 9 and 10 are used (with or without a small plate! I This paper guilt The standard is applicable to China National Standards (CNS) A4 specification (210.X29: 1mm) ^ r ----- f ~ installed ------ ordered ----- ~ line (please read the back side first (Notes to be filled in this page) A7 ——--------- B7 5. Description of the invention (7) and 12 (only placed on the side of the side walls 4 and 5) can be completely independent of each other. The two parameters of kidney M determine the characteristics of the coin M based on the alloy or alloy composition-thickness. Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy ^ ---------- 1 'installed — (please Read the precautions on the back first and fill out this page.) Line diagram 5 Horse three coins of the same form, the output signal of the electronic circuit 14 changes with time. The coin enters the first coil 9 at time q Measurement area, and when leaving β time% at time 12, enter the measurement area of coil 10, and then leave at time and time. The output signal of coil 9 contains two maximum 1 ^ 1 and M2, their values are respectively ⑴ and ⑴, the output signal of the coil 10 contains two maximum ml and m2, and their values are νΙ & ν2. The continuous signal represents the output k of the coin Μ, this coin rolls down along the coin channel 1 (Figure 丨) Do not jump or jump. Instead, lay it flat on the rib 7. In this example, the measurement values U1 and U2 are equal to the values vi and v2, that is, U1 = U2, vl = v2a The dotted line is the output of the coin M. Signal, where the coin jumps in the measurement area of the coil 9, at this time u and U2 are different. The dotted line represents the output signal of the coin M, where the coin M jumps in the measurement range of the second coil: 0 vl is not equal to ν2β. It is known from the test that at least one of (1) and (or) and (or) is quite stable, that is, it is a low-scattering body, and at this time, the smallest part corresponding to the maximum is subjected to larger scattering. In the example of the first coil 9, the larger of the two largest values corresponds to the minimum interval between the coil 9 and the coin M, because the coil 9 has the strongest resistance at this time. In the example of FIG. 5, the value of the second largest Μ2 is U2 'which is the more stable of the two largest, so the microprocessor can be designed so that it can determine the output signal of the first coil 9. The largest value, And it is stored as & value. The second coil 10 has a small resistance, and when the space between the coil 10 and the coin core is large, the resistance is large. Therefore, the microprocessor 15 can be designed so that it can be determined The two largest values of ml and m2 in the second coil 10 are vl ^ v2, and the smaller value of ν1 & ν2 is stored -10-. The size of this paper is suitable for the ^ country ^ 4) Α4 specification (210 > —---- 306995 A7 B7 V. Description of the invention (8) — ~~ As K2: K2 = min (vl, v2). In the example of 囷 5, the largest ... accords with this example. Known microprocessor 15. Perform the above analysis on the output signal. In order to balance the noise effect and reduce the dispersion of the determined value K & &, it is best to convert sequence fl to sequence f2, where f2 is the moving average of Π, such as 1 in sequence fl A moving average of 0 values. The determination of the maximum value of the output signal of the first coil 9 can be obtained by comparing the values, by calculating the first and The second derivative determines the maximum 〇1 and m2. In order to eliminate the influence of other physical factors during the measurement as much as possible, it is best for the microprocessor 15 to form a relative value Ρι = Γι / Κι & Ρ2 = Γ2 / Κ2, variables ~ and 4 When there is no coin M, it is equal to the reference resistance of the internal resistance 9 of the coil 9 and the resistance of the coil 10. The reference resistance ^ and & is preferably determined directly before or after the passage of the coin M. As is known, the coin M The two sides with different engravings are called "head" and "quota" in general British usage habits. The different engravings on the two sides lead to that in the example of determining the characteristic variables h and K: 2 of the coin M, the side of the coin μ must be located on the side wall 4. The spread of the variables 1 ^ and K2 shown in the example of a specific form of coin further increases this effect. However, the range of variable dispersion is still very small, making it obvious that the alloy of coin M is determined. On the other hand, this effect will interfere with the measurement of the thickness d and make the determination of the coin M and / or its value ^ more difficult. This is because the difference in the thickness of the coins produced from the same alloy is very different small. Using the measurement described in the next step, the influence of this thickness can be reduced when determining the thickness d. In the case of the coin M that has not been engraved, the measurements of the coils 9 and 10 produce values such as Y and K2. If the coin Μ two engraving patterns are different, and such as r * -11-This paper scale is applicable to the Chinese national standard (CNSTA4 specifications (210X 297 mm 1 ~ '.---------- r < ----- Subscribe -----; line (read first " Notes on reading back V® *. Item and then fill in ". work page) Central Bureau of Standards of the Ministry of Economic Affairs Employee Consumers ’Cooperatives Central Bureau of Standards of the Ministry of Economy Printed by the employee consumer cooperative A7 ___B7 V. Description of the invention (9) The side of the fruit head faces the coil 9, and the measurement value changes slightly to become K2-δΓ2. The increase in the variable results in the reduction of the variable K2, because between the coil 9 and the coin M The decrease in distance leads to an increase in the distance between the coin M and the coil 10. Since the linear relationship between the variable center and I is a function of the coin M $ relative to the distance between the coils, when the same coil 9 and 10 are used, and the coil 9, 10 When the same excitation frequency ω is used, then δηζδΓ / δΓ. In the case of the same coin M, if the tail side faces the coil 10, the measured values are KΓδΓ and K: 2 + δΓ. Therefore, it is best to use and IfPfP2 Measure the thickness of the coin Μ and use it as a criterion for the exclusion or acceptance of the coin μ, the combined value Η2 and the side with the coin Facing the side wall 4 is irrelevant, because -δΓ and + δΓ are eliminated from each other. Figure 3 shows the measurement value K! The% varies significantly with the alloy, so it is easy to determine the alloy of the coin M, based on this amount The tolerance limit that determines whether coin M is accepted or excluded can be set quite wide. For variable centers or d. Or Is. The closer the tolerance limit is set, the more coins M can be based on the thickness d. Reliable identification, in order to prevent the coin from jumping or jumping in the area of the inductive sensor, the rib 7 of the new architecture can be combined with the detailed signal analysis described now so that the variable center or? 2 or ± or ι2 is set very closely Tolerance becomes possible. Figure 6 shows a better-designed electronic circuit 14 ′. The circuit contains a resonant circuit RLC ′ to obtain the change in ohmic resistance and inductance Ls of the coil s. The series resonant circuit RLC formed by the coil S and the capacitive element c indicates that the ohmic impedance is equal to the impedance Rs of the coil s. In comparison with this, in the examples of vibrations, the parallel resonance of the parallel connection of the coil S and the capacitive element c Of the circuit The equivalent impedance is as follows: Τ'1 · -12-This paper scale is applicable to the Chinese National Standard (CNS> Α4 gauge pile (210x1 ^^ --- Ί. LI n ^ — Private clothing-.. Order FI-I 1 Line (Please read the notes on the back of the nine pages, and then fill in this page) A7 B7 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Invention Instructions (10) CX Rs

Zp = jx-

Ls which is a function of the ratio of the resistance center in the coil to the inductance Ls (j represents the dotted line unit) s The resonance frequency of the series resonant circuit RLC (〇0 (Ls) is: 1 c〇〇 (Ls) = ---

The / LsxC electronic circuit 14 includes a differential amplifier 18, which includes a switching input 9 and a non-switching input 20, a resistor 21, a bipolar amplifier circuit 22, and an amplitude detector 23. The series resonant circuit RLC includes a coil S and a capacitive element C, both connected in series, and connected to the ground m by one connection, and connected to the conversion input 19 of the differential amplifier 18 by another connection. The output of the differential amplifier 18 is fed back to the conversion input 19 via the resistor 21, and is connected to the non-conversion input 20 via the amplifier circuit 22.

The function of the amplifying circuit 22 is: first, when the circuit 14 is turned on, the series resonance circuit RLC can be resonated, and second, the vibration stabilization voltage U3 (t) can be applied to excite the series resonance circuit RLC. This function can use two series-connected inverters 24 and 25, and a downstream continuous voltage divider 26 ^ capacitors 27 and 28 are connected to the upstream of the input of the inverter 24! 25, and the inverters 24 and 25 The output of Heng resistance 29 and 30 is fed back to the input of each case. Capacitors 27 and 28 are used for DC DC decoupling. Resistors 29 and 30 determine the DC operating point of inverters 24 and 25. When the circuit 14 is turned on, the amplifier 22 behaves like a linear AC amplifier, so that when the output voltage% of the differential amplifier 18 is fed back to the input 20 as positive feedback, the resonant circuit RLC -13 China National Standard Soap (CNS) A4 specification (210X 297 mm) 1 ·-.-★ I- I! I— I —- 1 I-(^ 1 —II -——. Lli _ In j (please Please close the notes on the back and fill in this page) A7 _________B7 printed by the Employee Consumer Cooperative of the Central Standard Bureau of the Ministry of Economic Affairs V. _________B7 V. Description of the invention ~~~~ Start resonance. The input signal \ ⑴The choice of magnification is its value. High enough to make the first converter saturated, so that the output is always a square wave voltage% (1), which meets the two electric levels of positive and negative voltage levels, in which the electronic circuit 14 is in a known form relative to ground m , The use of bipolar method to accumulate people: the use of ohmic voltage divider 26 connected to the ground (iv) can reduce the voltage% ⑴ level 3 Therefore, the square wave electricity ⑴ appears at the output of the amplifier circuit 22, so it can become a differential amplifier 18 loser 20, the voltage and voltage u are in fine phase, but the vibration of the two phases is not light The knife presser 26 includes two resistors 3 and 32. The size of the resistor 3 is the same level as the resistance Rs of the coil $. The size of the resistor 32 is such that the level of the voltage ^ (1) is between tens and one hundred microvolts The vibration detector 23 can measure the vibration of U 〖1 and send it to the microprocessor 15 in an appropriate form. --- During the passage of the coin M, the resonance frequency ①〇 (Ls) changes to The operation of the circuit 14 described in "Adapting to the change of the inductance Ls" can make the series resonant circuit rlc vibrate at a frequency ω, and whenever it is equal to the resonance frequency, when the coin M passes through the coil s, the electric call of the latter also changes. Because the series connection The vibration circuit rlc measures the ohmic resistance WS = RS during vibration, and because the voltage U3 (1) of the excitation vibration circuit RLc is a periodic voltage with a fixed vibration, the current i (1) flows through the resonant circuit RLC 'in the intermediate circuit, so the differential amplifier 18 The electric_⑻ 之 振 # at the output is a direct measurement of the resistance Rs of the coil S. The calculation of the signal% (1) is now directly performed by the aforementioned microprocessor 15 3 The square wave coil presented at the output of the second inverter 25 a ⑴ frequency ① can be determined by simple methods, not shown in ®, for example With a counting module, when the coin M covers the coil S, it can make the microprocessor change with the time of the voltage% (1) vibration. In this way, the frequency determined in the coil ^ or, coil 10 ... and- 14-. The paper scale is applicable to the Chinese National Standard (C. \ s) Α4 specification (210X297 公 楚 J f ----- ^ ά ------ ίPlease read the precautions on the back before filling in the copy Page) A7 _ B7 printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (12) ω 2 corresponds to the resonant frequency during the passage of the coin M, and represents the third and fourth characteristic variable center and heart, which can be more Further as a decision criterion for the acceptance or exclusion of coins M. Using the above-mentioned device, the variables 1 and 2, the composition of the alloy, and the thickness of the coin M can be determined quasi-hard, and these variables are sufficient to identify the coin M. In order to rule out the possibility of deception, a special alloy coin Μ2 and a larger thickness d can be camouflaged with a relatively small coin Iv ^, or a thin metal small plate, where the coin is called the distance between the metal small plate and the coil 9 Intentional increase, such as inserting a non-metallic layer between the coin% and the coil 9, is sufficient to determine whether the reading frequency cQQ (Ls) of the coil 9 is greater or less than when there is no coin during the passage of the coin M. Therefore, it is preferable to change the double-sign in the resonance frequency co〇 (Ls) of the coil 9 as a decision criterion to further accept or exclude the coin M. When the coin M appears, it is not necessary to correctly determine the resonance frequency coQ (Ls). The advantages of the design of the coils 9 and 10 in the serial vibration circuit RLC are the alloy combination with varying characteristics and the thickness d of the varying characteristics can be applied-the circuit with a simple structure determines' and when the coin M appears, the serial resonance can be measured The resistance of RLC. Therefore, the series resonant circuit RLC represents a particularly suitable mechanism to measure the resistance change in the coil $. Therefore, when using a parallel resonant circuit, if the change in the inductance Ls and the change in the resistance Rs complement each other, then the presence of coins can be detected. No signal change occurs at this time, or the amount of image sign change is insufficient. The choice of the inductance Ls of the coil S and the value of the capacitive element c can make the resonant frequency ω〇 (Ι ^) of the adjustment circuit RLC range from 50 to 200 kHz, with a typical value of 90 kHz. At these frequencies, the depth of the magnetic field generated by the coil 5 penetrates the coin μ is sufficiently large, so it is sufficient to detect hard materials as needed -15- This paper music standard is applicable to the Chinese National Standard (CNS) Λ4 specification; 210: < 297 Gongchu) J ---.------ ^ -installed ------ ordered ----- "line (please read the ii matters on the back before filling this page) A 7 B7 V. The composition shown in the description of invention (13) The level change of the voltage U3 (1) of the excitation resonant circuit RLC can be caused, for example, by the change in the operating frequency of the power supply of the circuit 14, and this level change does not affect the variable p2 , Because this represents the ratio of two direct continuous resistance measurements. Inverters 24 and 25 can be, for example, inverters of known type 4007. In a particular embodiment of circuit 14, at least 24 of inverters 24 and 25 One of the NAND or NOR components is replaced by an additional input, which is connected to the output of the microprocessor 15. The circuit 14 can be turned on in a simple manner via the logic potential at the output of the microprocessor 15 or Turn off. Therefore, this circuit 14 can be turned on quickly if necessary -Test on coin M. Inverters 24 and 25 are replaced by NAND and NOR devices. The advantage is that when circuit 14 is in the off state, only very little power is required. FIG. 6 is only an example of circuit 14, which is suitable for serial connection The resonant circuit RLC detects the change of the resistance Rs of the coil S. There are still many examples of the series resonant circuit RLC, which uses voltage or current to excite the series resonant circuit RLC, which can be found in the technical document. -----. ------ ί-装 ------ 定 ----- ~ Line (please read the notes on the back before filling in the page) Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs-16 The paper size is in accordance with Chinese National Standard (C \ S) Α4 specification (210Χ 297mm)

Claims (1)

_______ 08 _______ 08 Printed A8 B8 C8 by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs VI. Scope of patent application 1—A device for testing the plausibility of coins (Μ), tokens or other flat metal objects, including a coin channel (1), the channel is provided with lower ⑷ and upper (5) side walls, the coin channel (1) can be inclined at a predetermined angle with respect to the vertical direction (ν), and in an ideal case, the coins (Μ) and The lower side wall ⑷ contacts and moves along the wall. Two induction sensors are arranged along the hard wall channel (1). The device further includes an electronic circuit (14), and a control and calculation unit (15). The first inductive sensor is a coil (9) connected to the lower side wall (4), and the second inductive sensor is a coil (10) connected to the upper side wall ⑺, in which a mechanism (13) is provided , 14) Operate the two coils (9'10) 'electrically independently and configure the electronic circuit (14) to measure the resistance r9⑴ and Ri〇⑴ of the two coils (9, 10.) during the passage of coins (μ) A situation that changes with time, where the control and calculation unit (15) determines the first The resistance R / t) of the circle (9) is the maximum value Kt, and the control and calculation unit (15) determines the resistance R1〇 (t) maximum value (ml'm2) of the second coil (10) and determines the two maximum values ( The larger of the two values (vl'v2) in ml, m2) is defined as κ2, where & and & or κι and Η2 = κι + Κ2 can decide to accept or exclude coins (Μ). 2. A device for testing the integrity of coins (Μ), tokens or other flat metal objects' includes a coin channel (1) with lower (4) and upper (5) side walls and coin channel (1 ) Can be inclined at a predetermined angle with respect to the vertical direction (V), and in an ideal situation, the coin (Μ) contacts the lower side wall ⑷ and moves along the wall 'two inductive sensors along the potato hard wall channel (1) The device also includes an electronic circuit (14) and a control and calculation unit (15), characterized in that the first inductive sensor is a coil (9) connected to the lower side wall (4), And the second inductive sensor is the upper side wall (5) r * · -17- This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (2_10x297mm) ^ ~ (Please read the precautions on the back before filling in (This page) ------ JI outfit ------ order ---- line -------- 306995 Coil (10) connected to the scope of patent application, in which the provision mechanism (13, 14) electrically operates the two coils (9, 10) independently, wherein the electronic circuit (4) can be measured during the passage of the coin (M) The resistance of two coils (9, 10) & ⑴ and Ri〇⑴ changes with time! 1 I J---I II 1- nn _ (please read the precautions on the back before filling in this page) And the calculation unit (15) determines the maximum resistance value of the first coil (9) (1), and the control and calculation unit (15) determines the maximum resistance value (nU, m2) of the resistance R10 (t) of the second coil (10), And determine the two maximum values (ml, m2) of the two maximum values (vl, V2), whichever is greater, which is defined as K2, where the control and calculation of Shan Fan (15), before or after the coin passes, directly determines the first coil ( 9) The internal resistance q, and the second resistance & of the second coil (10), and where ρρ / ΚΑ Ρ2 = Γ2 / Κ2, 5 ^^ and Ι2 = ρι + ρ2 can decide to accept or exclude coins (Μ) 3. The device according to the scope of the patent application is characterized in that the design of the coil (9'10) makes it possible to connect the resistance in the resonant circuit (RLC) in series. 4. The device according to item 3 of the patent application scope is characterized by an electronic circuit (14). The line of employees of the Central Standards Bureau of the Ministry of Economic Affairs Cooperative Society includes a differential amplifier (18) and an amplifier circuit (22). The output of the amplifier (丨 8) is inverted to the inverting input (19) via a resistor (21), and fed back to the non-inverting input (2) via an amplifier circuit (22), and the function of the amplifier circuit (22) First: when the electronic circuit (14) is turned on, the series resonant circuit (RLC) can be resonated, and the first cloud: the vibration stabilization voltage (u3 (t)) can excite the series resonant circuit (RLC). 5. The device according to item 4 of the patent application range is characterized in that the amplifier circuit (22) contains two series-connected inverters (24, 25) or N AND or NOR components. 6. The device according to item 3 of the patent application scope is characterized in that the coin passes the • 18 ·. Zhang scale applies the Chinese National Standard (CNS) A4 specification (210κ 297 mm) ABCD VI. During the application for the patent scope The order is provided to determine the symbol of the resonant frequency (co0 (Ls)) change in the first coil (9), and this symbol can be used as a basis for coin (M) exclusion or acceptance. 7. The device according to item 1 or 2 of the patent application is characterized in that in the case of a dance, a small metal plate (11, 12) is opposite to the side wall (5, 4) placed on the opposite side of the coil (9, 10) Pick up. 8. A device for testing coins (M), tokens or other flat metal objects, including a coin channel (1), this channel has a lower (4) and upper (5) side wall, the lower side wall (4) is The direction of the coin movement provides a rib (7), the coin channel (1) is inclined at a predetermined angle with respect to the vertical direction (V), and in the ideal case the coin (M) is along the lower side wall (4) ) The rib (7) moves, characterized in that the radius of curvature (R) of the rib ⑺ is at least half of the interval ⑷ of the adjacent rib ⑺. 9. The device according to item 8 of the patent application scope is characterized in that the radius of curvature (R) of the rib ⑺ is approximately equal to the interval ⑷ of the adjacent rib (7).丨 Installed ------ order -----. Line (please read the precautions on the back before filling in this X) Printed by Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs -19- This paper standard is applicable to the Chinese national standard (CNS) Μ regulation, grid (210X 297mm)