JPH0465355B2 - - Google Patents
Info
- Publication number
- JPH0465355B2 JPH0465355B2 JP63045327A JP4532788A JPH0465355B2 JP H0465355 B2 JPH0465355 B2 JP H0465355B2 JP 63045327 A JP63045327 A JP 63045327A JP 4532788 A JP4532788 A JP 4532788A JP H0465355 B2 JPH0465355 B2 JP H0465355B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detergent liquid
- detection
- voltage
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003599 detergent Substances 0.000 claims description 70
- 238000001514 detection method Methods 0.000 claims description 67
- 239000007788 liquid Substances 0.000 claims description 67
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 244000145845 chattering Species 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Geophysics And Detection Of Objects (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動販売機のコイン投入口に洗剤液
が注入されたことを検出するコイン投入口への洗
剤液注入検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for detecting the injection of detergent into a coin slot of a vending machine, which detects when detergent is injected into the coin slot of a vending machine. .
（従来の技術）
最近、自動販売機のコイン投入口に台所用家庭
洗剤液を注入してコイン通路からコインメカニズ
ム内に流し込み、コインメカニズム内の電気回路
を誤動作させて釣銭を流出させ、これを盗むとい
う盗難事故が発生している。(Prior art) Recently, a household detergent liquid was injected into the coin slot of a vending machine and poured into the coin mechanism from the coin passage, causing the electric circuit in the coin mechanism to malfunction and causing the change to flow out. There have been incidents of theft.
一方、従来の自動販売機では、コイン通路の途
中に雨水を内部に流れ込ませないための雨水取り
出し口を設け、この雨水取出し口から水を流出さ
せ、それ以後のコイン通路に雨水が流れ込まない
ようにしている。 On the other hand, in conventional vending machines, a rainwater outlet is provided in the middle of the coin passageway to prevent rainwater from flowing into the inside, and water flows out from this rainwater outlet to prevent rainwater from flowing into the coin passageway. I have to.
（発明が解決しようとする課題）
しかしながら、このような対策では洗剤液がス
プレー等で勢いよく注入された場合、雨水取り出
し口を飛び越えて通過してしまい、これには対処
できない問題点があつた。(Problem to be Solved by the Invention) However, with these measures, if the detergent solution is injected with force by a sprayer, etc., it will jump over the rainwater outlet and pass through, which is a problem that cannot be solved. .
本発明の目的は、コイン投入口に如何なる状態
で洗剤液が注入されてもこれを検出できるコイン
投入口への洗剤液注入検出装置を提供することに
ある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a device for detecting detergent liquid injection into a coin slot, which can detect detergent liquid being injected into the coin slot in any state.
（課題を解決するための手段）
上記の目的を達成するための本発明の構成を説
明すると、本発明のコイン投入口への洗剤液注入
検出装置は、対向電極よりなり、コイン通路に配
設される洗剤液センサーと該洗剤液センサーに直
列な抵抗との分圧回路よりなるセンサー回路と、
複数の抵抗が直列接続された分圧回路よりなる検
出基準電圧形成回路と、前記センサー回路からの
検出電圧を一方の入力とし、前記検出基準電圧形
成回路からの検出基準電圧を他方の入力として比
較を行い、前記洗剤液センサーの前記対向電極間
に洗剤液が存在して前記検出電圧が前記検出基準
電圧より上昇したとき、前記洗剤液センサーの抵
抗値に反比例した出力電圧を出力すると共に前記
検出基準電圧を相対的にリツプル補償電圧分だけ
低下させる動作をするリツプル補償型検出回路
と、前記リツプル補償型検出回路の出力の持続時
間を測定して、該出力が所定時間以上持続してい
るとき、前記洗剤液が注入されたと判定する洗剤
液判定回路とを備えて構成されている。(Means for Solving the Problems) To explain the configuration of the present invention for achieving the above object, the device for detecting the injection of detergent liquid into the coin slot of the present invention consists of opposing electrodes, and is arranged in the coin passage. a sensor circuit comprising a voltage dividing circuit including a detergent liquid sensor and a resistor in series with the detergent liquid sensor;
A detection reference voltage forming circuit consisting of a voltage dividing circuit in which a plurality of resistors are connected in series, the detection voltage from the sensor circuit as one input, and the detection reference voltage from the detection reference voltage forming circuit as the other input for comparison. When a detergent solution exists between the opposing electrodes of the detergent solution sensor and the detection voltage rises above the detection reference voltage, an output voltage inversely proportional to the resistance value of the detergent solution sensor is output and the detection A ripple compensation type detection circuit that operates to relatively lower the reference voltage by the amount of the ripple compensation voltage, and measuring the duration of the output of the ripple compensation type detection circuit, and when the output continues for a predetermined time or more. , and a detergent liquid determination circuit that determines that the detergent liquid has been injected.
（作用）
この発明は、直流電圧が印加されている対向電
極間に水が存在する場合は、両電極間での水の電
気分解により両電極間の抵抗値が上るに対し、洗
剤液が存在する場合は、両電極間の抵抗値が下が
るという現象がある点に着目してなされたもので
ある。(Function) In this invention, when water exists between the opposing electrodes to which a DC voltage is applied, the resistance value between the two electrodes increases due to the electrolysis of water between the two electrodes, whereas the resistance value between the two electrodes increases. This was done by focusing on the phenomenon that the resistance value between both electrodes decreases.
従つて、その洗剤液センサーに洗剤液が存在す
ると、該センサーの両電極間の抵抗値が所定時間
後に低下し、センサー回路の検出電圧が上昇し
て、検出基準電圧を越えるので、リツプル補償型
検出回路が洗剤液センサーの抵抗値に反比例した
出力を連続的に出す。その結果、洗剤液判定回路
からも判定出力が連続的に出るので、洗剤が注入
されたことがわかる。 Therefore, when detergent liquid is present in the detergent liquid sensor, the resistance value between both electrodes of the sensor decreases after a predetermined period of time, and the detection voltage of the sensor circuit increases and exceeds the detection reference voltage. The detection circuit continuously outputs an output that is inversely proportional to the resistance value of the detergent liquid sensor. As a result, the determination output is continuously output from the detergent liquid determination circuit, so that it is known that the detergent has been injected.
一方、洗剤液センサーに水が存在すると、該セ
ンサーの両電極間の抵抗値が水の電気分解により
所定時間後に上昇し、センサー回路の検出電圧が
下降して１〜２秒後に検出基準電圧に達しなくな
るので、リツプル補償型検出回路が出力を出さな
くなる。従つて、洗剤液判定回路はリツプル補償
型検出回路が最初は出力を出していたとしても、
１〜２秒後に出力がなくなるので、判定出力を出
さない。 On the other hand, when water is present in the detergent liquid sensor, the resistance value between both electrodes of the sensor increases after a predetermined time due to water electrolysis, and the detection voltage of the sensor circuit decreases and reaches the detection reference voltage after 1 to 2 seconds. Since the voltage is no longer reached, the ripple compensation type detection circuit no longer outputs an output. Therefore, even if the ripple compensation type detection circuit initially outputs an output in the detergent liquid determination circuit,
Since the output disappears after 1 to 2 seconds, no judgment output is output.
リツプル補償型検出回路は、検出電圧が検出基
準電圧を越えて出力を出すと、検出基準電圧を相
対的にリツプル補償電圧分だけ低下させるので、
その直後に検出電圧が最初の検出基準電圧値より
低下、上昇するリツプルが生じても、出力を止め
たり出したりせず、出力を出し続けることになり
チヤタリグを防止でき、動作を安定させることが
できる。 In the ripple compensation type detection circuit, when the detection voltage exceeds the detection reference voltage and outputs, the detection reference voltage is relatively lowered by the ripple compensation voltage.
Immediately after that, even if a ripple occurs in which the detection voltage drops or rises from the initial detection reference voltage value, the output will not be stopped or output, but will continue to be output, preventing chatter and stabilizing the operation. can.
（実施例）
以下、本発明の実施例を第１図及び第２図を参
照して詳細に説明する。図示のように、自動販売
機１の前面には、コイン投入口２が設けられてい
る。このコイン投入口２の後側には、第１、第２
のシユート３，４によりコイン通路５が形成さ
れ、コイン通路５を通つたコインはコインメカニ
ズム６内に投入されるようになつている。コイン
投入口２の直後には防止板７が吊り下げられてい
て、雨水がコイン通路５内に入らず、下の落下口
８から排液通路９に落下し、排液されるようにな
つている。また、第１、第２のシート３，４の境
界で第１のシユート３の末端下部には、液を排液
通路９側へガイドするガイド板１０が設けられて
いる。なお、１１は看板、１２は看板１１を照ら
す照明灯である。(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2. As shown in the figure, a coin slot 2 is provided on the front side of the vending machine 1. On the back side of this coin slot 2, there are a first and a second coin slot.
A coin passage 5 is formed by the chute 3 and 4, and coins passing through the coin passage 5 are thrown into a coin mechanism 6. A prevention plate 7 is suspended immediately after the coin slot 2 to prevent rainwater from entering the coin passage 5 and to allow it to fall from the drop opening 8 below into the drainage passage 9 and be drained. There is. Furthermore, a guide plate 10 is provided at the lower end of the first chute 3 at the boundary between the first and second sheets 3 and 4 to guide the liquid toward the drain passage 9 side. Note that 11 is a signboard, and 12 is a lighting lamp that illuminates the signboard 11.
コイン通路５の下部の複数箇所には、洗剤液セ
ンサー１３が配設されている。該洗剤液センサー
１３は、図示しない絶縁基板上に所定の間隔で対
向配置された、一対の電極１３Ａ，１３Ｂにより
形成され、抵抗１４と可変抵抗１５と共に直列接
続の分圧回路よりなるセンサー回路１６の中に組
み込まれている。センサー回路１６の一端の抵抗
１４の端部は、図示しない直流電源のプラス側に
接続され、他端の可変抵抗１５の端部は接地され
ている。可変抵抗１５にはコンデンサ１７が並列
接続されている。センサー回路１６の検出電圧は
分圧電圧として可変抵抗１５の両端に現われ、こ
の検出電圧は抵抗１８を経て、Ｃ・MOS・ICの
コンパレータよりなるリツプル補償型検出回路１
９のプラス入力端に印加されるようになつてい
る。リツプル補償型検出回路１９の入力側には、
更に、抵抗２０，２１が直列接続された分圧回路
よりなる検出基準電圧形成回路２２が設けられて
いる。該検出基準電圧形成回路２２の一端の抵抗
２０の端部は、前述した図示しない直流電源のプ
ラス側に接続され、他端の抵抗２１の端部は接地
されている。該検出基準電圧形成回路２２の検出
基準電圧は、分圧電圧として抵抗２１の両端に現
われ、この検出基準電圧はリツプル補償型検出回
路１９のマイナス入力端に印加されるようになつ
ている。この検出基準電圧は、洗剤液の抵抗値に
対する検出電圧と等しい値になるように定められ
ている。 Detergent liquid sensors 13 are disposed at a plurality of locations at the bottom of the coin passage 5. The detergent liquid sensor 13 is formed by a pair of electrodes 13A and 13B that are placed opposite each other at a predetermined interval on an insulating substrate (not shown), and includes a sensor circuit 16 that is a voltage dividing circuit connected in series with a resistor 14 and a variable resistor 15. is incorporated within. One end of the resistor 14 of the sensor circuit 16 is connected to the positive side of a DC power supply (not shown), and the other end of the variable resistor 15 is grounded. A capacitor 17 is connected in parallel to the variable resistor 15. The detected voltage of the sensor circuit 16 appears as a divided voltage across the variable resistor 15, and this detected voltage passes through the resistor 18 to the ripple compensation type detection circuit 1 consisting of a C/MOS/IC comparator.
It is applied to the positive input terminal of No. 9. On the input side of the ripple compensation type detection circuit 19,
Furthermore, a detection reference voltage forming circuit 22 is provided, which is a voltage dividing circuit in which resistors 20 and 21 are connected in series. One end of the resistor 20 of the detection reference voltage forming circuit 22 is connected to the plus side of the aforementioned DC power supply (not shown), and the other end of the resistor 21 is grounded. The detection reference voltage of the detection reference voltage forming circuit 22 appears as a divided voltage across the resistor 21, and this detection reference voltage is applied to the negative input terminal of the ripple compensation type detection circuit 19. This detection reference voltage is determined to have a value equal to the detection voltage for the resistance value of the detergent liquid.
リツプル補償型検出回路１９の出力端とプラス
入力端との間には、洗剤液の検出直後に検出電圧
を相対的にリツプル補償電圧分だけ低下させる動
作を行う、リツプル補償抵抗２３が接続されてい
る。また、該リツプル補償型検出回路１９の出力
端とマイナス入力端との間には、感度調整用抵抗
２４が接続されている。 A ripple compensation resistor 23 is connected between the output terminal and the positive input terminal of the ripple compensation type detection circuit 19, which operates to relatively lower the detected voltage by the ripple compensation voltage immediately after detecting the detergent liquid. There is. Furthermore, a sensitivity adjustment resistor 24 is connected between the output terminal and the negative input terminal of the ripple compensation type detection circuit 19.
リツプル補償型検出回路１９の出力端には、そ
の出力の接続時間を測定して該出力が所定時間以
上接続しているとき、洗剤液の抵抗値に反比例し
た出力電圧を連続的に出して洗剤液が注入された
と判定する第１の洗剤液判定回路２５が接続され
ている。この第１の洗剤液判定回路２５は、抵抗
２６とコンデンサ２７とよりなる積分回路により
形成されている。 The output terminal of the ripple compensation type detection circuit 19 measures the connection time of the output, and when the output is connected for a predetermined time or more, it continuously outputs an output voltage inversely proportional to the resistance value of the detergent liquid. A first detergent liquid determination circuit 25 that determines that liquid has been injected is connected. The first detergent liquid determination circuit 25 is formed of an integrating circuit including a resistor 26 and a capacitor 27.
この第１の洗剤液判定回路２５の出力電圧は、
抵抗２８を介してＣ・MOS・ICのコンパレータ
よりなるリツプル補償型の第２の洗剤液判定回路
２９のプラス入力端に入力されるようになつてい
る。リツプル補償型の第２の洗剤液判定回路２９
の入力側には、抵抗３０，３１が直列接続された
分圧回路よりなる判定基準電圧形成回路３２が設
けられている。該判定基準電圧形成回路３２の一
端の抵抗３０の端部は前述しない直流電源のプラ
ス側に接続され、他端の抵抗３１の端部は接地さ
れている。該判定基準電圧形成回路３２の判定基
準電圧は分圧電圧として抵抗３１の両端に現わ
れ、この判定基準電圧はリツプル補償型の第２の
洗剤液判定回路２９のマイナス入力端に印加され
るようになつている。この判定基準電圧は、洗剤
液の抵抗値に対する検出電圧と等しい値になるよ
うに定められている。 The output voltage of this first detergent liquid determination circuit 25 is
The signal is input via a resistor 28 to the positive input terminal of a ripple-compensated second detergent liquid determination circuit 29 made up of a C/MOS/IC comparator. Ripple compensation type second detergent liquid determination circuit 29
A determination reference voltage forming circuit 32 consisting of a voltage dividing circuit in which resistors 30 and 31 are connected in series is provided on the input side. One end of the resistor 30 of the judgment reference voltage forming circuit 32 is connected to the positive side of a DC power supply (not described above), and the other end of the resistor 31 is grounded. The determination reference voltage of the determination reference voltage forming circuit 32 appears as a divided voltage across the resistor 31, and this determination reference voltage is applied to the negative input terminal of the ripple compensation type second detergent liquid determination circuit 29. It's summery. This determination reference voltage is determined to have a value equal to the detection voltage for the resistance value of the detergent liquid.
リツプル補償型の第２の洗剤液判定回路２９の
出力端とプラス入力端との間には、該回路での洗
剤液の判定直後に判定基準電圧を相対的にリツプ
ル補償電圧だけ低下させる動作を行う、リツプル
補償抵抗３３が接続されている。また、該リツプ
ル補償型の第２の洗剤液判定回路２９の出力端と
マイナス入力端との間には、感度調整用抵抗３４
が接続されている。 An operation is provided between the output terminal and the positive input terminal of the ripple compensation type second detergent liquid determination circuit 29 to relatively lower the determination reference voltage by the ripple compensation voltage immediately after determination of the detergent liquid in this circuit. A ripple compensation resistor 33 is connected. Further, a sensitivity adjustment resistor 34 is connected between the output terminal and the negative input terminal of the second detergent liquid determination circuit 29 of the ripple compensation type.
is connected.
リツプル補償型の第２の洗剤液判定回路２９の
出力端には、抵抗３５，３６を介してスイツチン
グトランジスタ３７が接続され、該スイツチング
トランジスタ３７のコレクタ側には、該スイツチ
ングトランジスタ３７で制御されるブザー３８が
接続されている。 A switching transistor 37 is connected to the output terminal of the ripple compensation type second detergent liquid determination circuit 29 via resistors 35 and 36, and a switching transistor 37 is connected to the collector side of the switching transistor 37. A controlled buzzer 38 is connected.
このような洗剤液注入検出装置は、コイン投入
口２へ洗剤液が注入されてコイン通路５を通り洗
剤液センサー１３に達すると、該洗剤液センサー
１３の電極１３Ａ，１３Ｂ間の抵抗値が洗剤液が
入つた当初は10KΩであつたものが１〜２秒後に
5KΩ程度まで下がる。従つて、リツプル補償型
検出回路１９の入力は、最初は検出基準電圧より
検出電圧の方が小さく該リツプル補償型検出回路
２２の出力は０である。次に、洗剤液センサー１
３の抵抗値が所定時間後に小さくなると、分圧比
が変つて検出基準電圧より検出電圧の方が大きく
なり、大きくなつた分だけリツプル補償型検出回
路１９から出力が現われる。この出力は洗剤液セ
ンサー１３の抵抗値の低下に反比例して大きくな
つている。このようにリツプル補償型検出回路１
９から出力が出ると、リツプル補償抵抗２３の存
在により、その抵抗値で定められたリツプル補償
電圧分だけ検出基準電圧が相対的に低下される。
従つて、その直後に電圧が低下し、上昇しても、
検出基準電圧はそれより下の電圧となつているの
で、リツプル補償型検出回路１９は出力を続け、
後続回路のチャタリングを防止する。リツプル補
償型判定回路１９の出力は第１の洗剤液判定回路
２５に与えられ、その出力の持続時間がコンデン
サ２７を利用して測定される。洗剤液センサー１
３に洗剤液が存在するときには、第１の洗剤液判
定回路２５に入力が与えられ続けるので、コンデ
ンサ２７の充電電圧が上昇し、洗剤液が投入され
ているという所定レベルの第１の判定出力を出す
ようになる。この第１の判定出力が、リツプル補
償型の第２の洗剤液判定回路２９のプラス入力端
に与えられ、マイナス入力端には判定基準電圧形
成回路３２から判定基準電圧が与えられる。この
場合には、第１の判定出力が判定基準電圧を越え
るので、越えた分だけリツプル補償型の第２の洗
剤液判定回路２９から第２の判定出力が現われ
る。この第２の判定出力は、洗剤液センサー１３
の抵抗値の低下に反比例して増大している。この
第２の安定出力によりスイツチングトランジスタ
３７がオンとなり、ブザー３８が鳴り出し、洗剤
液が注入されたことを知らせる。また、スイツチ
ングトランジスタ３７でリレーを動作させて、コ
インの流出を止めることもできる。 In such a detergent liquid injection detection device, when detergent liquid is injected into the coin slot 2 and passes through the coin passage 5 and reaches the detergent liquid sensor 13, the resistance value between the electrodes 13A and 13B of the detergent liquid sensor 13 is determined by the detergent liquid. When the liquid first entered, the resistance was 10KΩ, but after 1 to 2 seconds it became
It drops to about 5KΩ. Therefore, the detection voltage at the input of the ripple compensation type detection circuit 19 is initially smaller than the detection reference voltage, and the output of the ripple compensation type detection circuit 22 is 0. Next, detergent liquid sensor 1
When the resistance value of 3 becomes smaller after a predetermined time, the voltage division ratio changes and the detection voltage becomes larger than the detection reference voltage, and an output corresponding to the increased voltage appears from the ripple compensation type detection circuit 19. This output increases in inverse proportion to the decrease in the resistance value of the detergent liquid sensor 13. In this way, ripple compensation type detection circuit 1
When the output is output from the ripple compensation resistor 23, the detection reference voltage is relatively lowered by the ripple compensation voltage determined by the resistance value of the ripple compensation resistor 23.
Therefore, even if the voltage drops and rises immediately after that,
Since the detection reference voltage is lower than that, the ripple compensation type detection circuit 19 continues to output,
Prevents chattering in subsequent circuits. The output of the ripple compensation type determination circuit 19 is given to a first detergent liquid determination circuit 25, and the duration of the output is measured using a capacitor 27. Detergent liquid sensor 1
When the detergent liquid is present in step 3, the input is continued to be given to the first detergent liquid determination circuit 25, so the charging voltage of the capacitor 27 increases, and the first determination output is at a predetermined level indicating that the detergent liquid is being introduced. will begin to produce. This first judgment output is applied to the plus input terminal of the second detergent liquid judgment circuit 29 of ripple compensation type, and the judgment reference voltage is applied from the judgment reference voltage forming circuit 32 to the minus input terminal. In this case, since the first judgment output exceeds the judgment reference voltage, the second judgment output appears from the ripple compensation type second detergent liquid judgment circuit 29 by the amount exceeding the judgment reference voltage. This second judgment output is determined by the detergent liquid sensor 13.
increases in inverse proportion to the decrease in resistance value. This second stable output turns on the switching transistor 37, and the buzzer 38 starts to sound, indicating that the detergent liquid has been injected. Further, it is also possible to operate a relay using the switching transistor 37 to stop coins from flowing out.
なお、このような動作は、コイン投入口２に食
塩水が注入されたときにも起こり、ブザー３８を
鳴らすことができる。 Note that such an operation also occurs when saline is injected into the coin slot 2, and the buzzer 38 can be sounded.
一方、コイン投入口２に水が注入されたときに
は、水の注入により最初は洗剤液センサー１３の
抵抗値が10KΩ程度であつたものが、水の電気分
解により電極１３Ａ，１３Ｂの表面が絶縁されて
１〜２秒後に50KΩ〜150KΩに上昇する。従つ
て、リツプル補償型検出回路１９は最初は出力を
瞬間的に出したとしても、直ぐに出力を出さなく
なる。この瞬間的な出力は第１の洗剤液判定回路
２５で吸収され、ブザー３８は鳴らない。 On the other hand, when water is injected into the coin slot 2, the resistance value of the detergent liquid sensor 13 was initially about 10KΩ due to the water injection, but due to the electrolysis of the water, the surfaces of the electrodes 13A and 13B are insulated. After 1-2 seconds, it increases to 50KΩ to 150KΩ. Therefore, even if the ripple compensation type detection circuit 19 momentarily outputs an output at first, it immediately stops outputting. This instantaneous output is absorbed by the first detergent liquid determination circuit 25, and the buzzer 38 does not sound.
何らかの原因で第１の洗剤液判定回路２５から
誤判定出力が出ても、第２の洗剤液判定回路２９
出再判定をするので、誤判定を防ぐことができ
る。 Even if an erroneous determination is output from the first detergent liquid determination circuit 25 for some reason, the second detergent liquid determination circuit 29
Since ceding judgment is performed, erroneous judgment can be prevented.
（発明の効果）
以上説明したように本発明では、洗剤液は電極
間において電圧をかけたとき抵抗値が低下すると
いう特性を有することを利用して、リツプル補償
型判定回路でその検出を行い、その検出が正しい
かどうかをその出力の持続時間を利用して洗剤液
判定回路で判定するので、洗剤液が注入されたこ
とを正しく検出することができる。従つて、自動
販売機のコイン盗難を防止することができる。ま
た、本発明の装置では、リツプル補償型検出回路
を用いて、検出後に検出基準電圧を相対的にリツ
プル補償電圧分だけ低下させるので、その直後に
検出電圧が下降、上昇してもこれを無視して出力
を安定させ、後続回路のチヤタリングを防止する
ことができる。(Effects of the Invention) As explained above, in the present invention, the detergent liquid has a characteristic that the resistance value decreases when a voltage is applied between the electrodes, and this is detected by the ripple compensation type determination circuit. Since the detergent liquid determination circuit determines whether the detection is correct using the duration of the output, it is possible to correctly detect that the detergent liquid has been injected. Therefore, theft of coins from vending machines can be prevented. Furthermore, in the device of the present invention, a ripple compensation type detection circuit is used to relatively lower the detection reference voltage by the ripple compensation voltage after detection, so even if the detection voltage drops or rises immediately thereafter, this is ignored. This stabilizes the output and prevents chattering in subsequent circuits.
第１図は本発明に係る洗剤液注入検出装置の一
実施例を示す回路図、第２図は本発明を適用した
自動販売機の一例の要部縦断面図である。
１……自動販売機、２……コイン投入口、５…
…コイン通路、１３……洗剤液センサー、１３
Ａ，１３Ｂ……電極、１４……抵抗、１５……可
変抵抗、１６……センサー回路、１９……リツプ
ル補償検出回路、２０，２１……抵抗、２２……
検出基準電圧形成回路、２３……リツプル補償抵
抗、２５……第１の洗剤液判定回路、２６……抵
抗、２７……コンデンサ、２９……第２の洗剤液
判定回路、３２……判定基準電圧形成回路、３７
……スイツチングトランジスタ、３８……ブザ
ー。
FIG. 1 is a circuit diagram showing an embodiment of a detergent liquid injection detection device according to the present invention, and FIG. 2 is a longitudinal sectional view of a main part of an example of a vending machine to which the present invention is applied. 1...Vending machine, 2...Coin slot, 5...
...Coin passage, 13...Detergent liquid sensor, 13
A, 13B... Electrode, 14... Resistor, 15... Variable resistor, 16... Sensor circuit, 19... Ripple compensation detection circuit, 20, 21... Resistor, 22...
Detection reference voltage forming circuit, 23... Ripple compensation resistor, 25... First detergent liquid determination circuit, 26... Resistor, 27... Capacitor, 29... Second detergent liquid determination circuit, 32... Judgment standard Voltage forming circuit, 37
...Switching transistor, 38...Buzzer.
Claims (1)
洗剤液センサーと該洗剤液センサーに直列な抵抗
との分圧回路よりなるセンサー回路と、複数の抵
抗が直列接続された分圧回路よりなる検出基準電
圧形成回路と、前記センサー回路からの検出電圧
を一方の入力とし、前記検出基準電圧形成回路か
らの検出基準電圧を他方の入力として比較を行
い、前記洗剤液センサーの前記対向電極間に洗剤
液が存在して前記検出電圧が前記検出基準電圧よ
り上昇したとき、前記洗剤液センサーの抵抗値に
反比例した出力電圧を出力すると共に前記検出基
準電圧を相対的にリツプル補償電圧分だけ低下さ
せる動作をするリツプル補償型検出回路と、前記
リツプル補償型検出回路の出力の持続時間を測定
して、該出力が所定時間以上持続しているとき、
前記洗剤液が注入されたと判定する洗剤液判定回
路とを備えてなるコイン投入口への洗剤液注入検
出装置。1. Detection consisting of a sensor circuit consisting of a voltage dividing circuit consisting of a detergent liquid sensor arranged in a coin passage and a resistor connected in series with the detergent liquid sensor, and a voltage dividing circuit consisting of a plurality of resistors connected in series, each consisting of opposing electrodes. The detection voltage from the reference voltage forming circuit and the sensor circuit is used as one input, and the detection reference voltage from the detection reference voltage forming circuit is used as the other input for comparison. An operation of outputting an output voltage that is inversely proportional to the resistance value of the detergent liquid sensor and relatively lowering the detection reference voltage by a ripple compensation voltage when a liquid is present and the detection voltage rises above the detection reference voltage. measuring the duration of the output of the ripple compensation type detection circuit and the ripple compensation type detection circuit, and when the output continues for a predetermined time or more,
A detergent liquid injection detection device into a coin slot, comprising a detergent liquid determination circuit that determines that the detergent liquid has been injected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63045327A JPH01219587A (en) | 1988-02-26 | 1988-02-26 | Detecting device for injection of detergent liquid into coin slot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63045327A JPH01219587A (en) | 1988-02-26 | 1988-02-26 | Detecting device for injection of detergent liquid into coin slot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01219587A JPH01219587A (en) | 1989-09-01 |
| JPH0465355B2 true JPH0465355B2 (en) | 1992-10-19 |
Family
ID=12716217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63045327A Granted JPH01219587A (en) | 1988-02-26 | 1988-02-26 | Detecting device for injection of detergent liquid into coin slot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01219587A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318164A (en) * | 1992-05-15 | 1994-06-07 | Mars Incorporated | Vending machine apparatus and method to prevent fraud and minimize damage from injected fluids |
| GB2304958B (en) * | 1995-09-07 | 1999-10-27 | Mars Inc | Method and apparatus for protecting a money-handling unit vunerable to liquid |
| US7633380B1 (en) | 2007-04-10 | 2009-12-15 | Gerald Lee Hall | Anti-fraud system for a car wash station |
-
1988
- 1988-02-26 JP JP63045327A patent/JPH01219587A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01219587A (en) | 1989-09-01 |
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