JPH0132440Y2 - - Google Patents
Info
- Publication number
- JPH0132440Y2 JPH0132440Y2 JP10319280U JP10319280U JPH0132440Y2 JP H0132440 Y2 JPH0132440 Y2 JP H0132440Y2 JP 10319280 U JP10319280 U JP 10319280U JP 10319280 U JP10319280 U JP 10319280U JP H0132440 Y2 JPH0132440 Y2 JP H0132440Y2
- Authority
- JP
- Japan
- Prior art keywords
- dial
- oscillator
- pushbutton
- circuit
- signal
- 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
Links
- 230000010355 oscillation Effects 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 3
- 230000010287 polarization Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Prepayment Telephone Systems (AREA)
Description
【考案の詳細な説明】
本考案は、貨幣収納信号として交換局から送出
される転極パルス信号の切断時間における押ボタ
ンダイヤル発振器の駆動電流を補償するためのコ
ンデンサを備えた押ボタンダイヤル電話機の回路
に関し、特に、押ボタンダイヤル発振器(以下、
PB信号発振器と略称する)の押しボタン操作時
に起り得る異常発振を防止するようにした異常発
振防止回路に関するものである。[Detailed description of the invention] The present invention is a pushbutton dial telephone equipped with a capacitor for compensating the drive current of the pushbutton dial oscillator during the disconnection time of the polarity inversion pulse signal sent from the exchange as a money storage signal. Regarding the circuit, in particular, the pushbutton dial oscillator (hereinafter referred to as
This invention relates to an abnormal oscillation prevention circuit that prevents abnormal oscillations that may occur when a push button of a PB signal oscillator (PB signal oscillator) is operated.
第1図は、従来の押ボタンダイヤル電話機の主
要部を示す回路図である。同図において、L1,
L2は交換局の局線に接続する電話機端子、HSは
フツクスイツチで、送受話器を上げることにより
動作して掛戻すまで動作する接点、Mは応答監視
用リレーで、端子L1に印加されるパルスの極性
が(+)になつたとき動作し動作後通話終了まで
保持されて、送受話器を掛戻すことにより復旧す
る機能を備えている。CCLは送受話器を上げた
後硬貨の投入により機械的に動作し、送受話器を
掛戻すまで動作保持している接点であり、m1〜
m3は応答監視用リレーMの接点である。この応
答監視用リレーMと接点m1〜m3は、発信者の発
信時から被呼者の応答時までの間だけ後述する通
話電流補償用のコンデンサC1を通話回路と切り
離し、コンデンサC1の最初の充電に起因する後
述するPB信号発振器Oの駆動電圧の不足を補償
するためのものである。D1,D2は電流方向検出
用ダイオード、Tは送話器、Rは受話器である。
Dは端子L1,L2に印加される転極パルスの極性
が変つてもPB信号発振器Oに一定方向の電流が
流れるように接続されたダイオードD3〜D6より
なるダイオードブリツジ回路を示し、C1は上記
ブリツジ回路Dの出力端子間に接続された駆動電
流補償用コンデンサ、Lはクリツク電流を阻止す
るコイル、OはPB信号発振器であり、該PB信号
発振器Oは周波数接点Pfと共通接点Pcよりなる
押ボタンダイヤルPの操作により2周波のPB信
号を発振し得るように構成されている。ZDは前
記駆動電流補償用コンデンサC1の充電に必要な
電圧を加えるための抵抗として用いられているツ
エナーダイオードである。 FIG. 1 is a circuit diagram showing the main parts of a conventional push-button dial telephone. In the same figure, L 1 ,
L 2 is a telephone terminal that connects to the central office line of the exchange, HS is a telephone switch, which is a contact that operates when you pick up the handset until the call is returned, and M is a response monitoring relay, which is applied to terminal L 1 . It operates when the polarity of the pulse becomes (+) and is held until the end of the call after activation, and has a function that can be restored by hanging up the handset. CCL is a contact that operates mechanically when a coin is inserted after the handset is picked up, and remains operational until the handset is picked up .
m 3 is a contact point of relay M for response monitoring. This response monitoring relay M and contacts m 1 to m 3 separate a capacitor C 1 for speech current compensation, which will be described later, from the speech circuit only from the time the caller makes a call to the time the called party answers . This is to compensate for the lack of drive voltage of the PB signal oscillator O, which will be described later, due to the initial charging of the PB signal oscillator O. D 1 and D 2 are current direction detection diodes, T is a transmitter, and R is a receiver.
D is a diode bridge circuit consisting of diodes D 3 to D 6 connected so that current flows in a constant direction to the PB signal oscillator O even if the polarity of the polarization pulse applied to terminals L 1 and L 2 changes. , C1 is a drive current compensation capacitor connected between the output terminals of the bridge circuit D, L is a coil for blocking click current, O is a PB signal oscillator, and the PB signal oscillator O is connected to the frequency contact Pf. It is configured so that a two-frequency PB signal can be oscillated by operating a push button dial P consisting of a common contact Pc. ZD is a Zener diode used as a resistor for applying a voltage necessary for charging the drive current compensation capacitor C1 .
このように構成された電話機が自即公衆電話機
として使用される場合、貨幣収納信号としては一
般的に第3図に示すような通話電流を逆転する直
流の転極パルスが用いられている。この転極パル
スは、局内機器と端末機器間の信号送受信時にお
ける雑音を低減するために、転極前後に数10ms
の電流切断時間tcが設けられてあるが、この切断
時間tcによつて電話機側において通話の切断が生
じないように、また、切断時間tcによつてPB信
号自体を通信手段として使用している際にPB信
号発振器Oの発振不能が生じないように、ダイオ
ードブリツジ回路DとPB信号発振器Oとの線路
間にコンデンサC1を接続せしめて、このコンデ
ンサC1の充放電を利用することにより通話電流
及びPB発振器Oの駆動電流を補償している。 When a telephone configured in this manner is used as a public telephone, a DC polarity reversal pulse for reversing the communication current as shown in FIG. 3 is generally used as the coin storage signal. This polarity reversal pulse is applied several tens of milliseconds before and after polarity reversal in order to reduce noise during signal transmission and reception between station equipment and terminal equipment.
A current cut-off time tc is provided, but in order to prevent the call from being cut off on the telephone side due to this cut-off time tc, the PB signal itself is used as a communication means by the cut-off time tc. In order to prevent the PB signal oscillator O from being unable to oscillate, a capacitor C1 is connected between the line between the diode bridge circuit D and the PB signal oscillator O, and the charging and discharging of this capacitor C1 is used. It compensates for the communication current and the drive current of the PB oscillator O.
また、送話器Tは抵抗値が小さいため該送話器
Tを上記コンデンサC1と単に並列に接続した場
合には、コンデンサC1には充電に必要な電圧が
加えられないので、上記送話器Tには直列にツエ
ナーダイオードZD等による高抵抗素子が設けら
れている。しかしながら、こうした高抵抗素子を
送話器Tと直列に接続した場合には、押ボタンダ
イヤルPの操作時に共通接点Pcが三点接触する
とPB発振器Oが異常発振を起すという問題点が
あつた。すなわち、押ボタンダイヤルPを操作す
ると、共通接点PcによりPB信号発振器Oと、送
話器T側の回路とのON状態が入れ代るのである
が、このON状態が入れ代る途中に共通接点Pcが
三点接触する時間tsが存在する。然して、この三
点接触の状態はPB信号発振器Oとツエナーダイ
オードZDとが並列接続された状態を作り、PB信
号発信器Oには中途半端な電圧が加えられること
になる。従つて、PB信号発振器Oは第4図に示
すように正常な発振波W1のほかに三点接触によ
る異常な発振波W2を発振し、この異常な発振波
W2が信号として誤認されるおそれがあり、特に
PB信号発振器Oとして集積回路を用いた場合に
は顕著なものとなつてきた。 Furthermore, since the resistance value of the transmitter T is small, if the transmitter T is simply connected in parallel with the capacitor C1 , the voltage required for charging will not be applied to the capacitor C1 , so the transmitter A high resistance element such as a Zener diode ZD is provided in series with the speaker T. However, when such a high-resistance element is connected in series with the transmitter T, there is a problem in that when the common contact Pc contacts three points when the pushbutton dial P is operated, the PB oscillator O causes abnormal oscillation. That is, when the pushbutton dial P is operated, the ON state of the PB signal oscillator O and the circuit on the side of the transmitter T are switched by the common contact Pc, but while this ON state is being switched, the common contact There is a time ts during which Pc makes contact at three points. However, this three-point contact state creates a state in which the PB signal oscillator O and the Zener diode ZD are connected in parallel, and a halfway voltage is applied to the PB signal oscillator O. Therefore, as shown in Fig. 4, the PB signal oscillator O oscillates an abnormal oscillation wave W 2 due to the three-point contact in addition to the normal oscillation wave W 1 , and this abnormal oscillation wave
W 2 may be mistaken as a signal, especially
The use of integrated circuits as the PB signal oscillator O has become prominent.
本考案は以上のような点に鑑みてなされたもの
であり、押ボタンダイヤルの共通接点が三点接触
した際に、PB信号発振器と並列に低抵抗回路が
形成される構成として、PB信号発振器の異常発
振を防止することを目的とするものである。 The present invention was developed in view of the above points, and the PB signal oscillator has a configuration in which a low resistance circuit is formed in parallel with the PB signal oscillator when the three common contacts of the pushbutton dial make contact. The purpose of this is to prevent abnormal oscillations.
次に、図面にもとづいて本考案に係る回路の一
実施例を説明する。 Next, an embodiment of the circuit according to the present invention will be described based on the drawings.
第2図は、本考案に係る回路を有する公衆電話
機回路を示す主要部の回路図であり、第1図と同
様の箇所には同等の符号を用いてある。 FIG. 2 is a circuit diagram of the main parts of a public telephone circuit having a circuit according to the present invention, and the same reference numerals are used for the same parts as in FIG. 1.
すなわち、送話器TとツエナーダイオードZD
とPB信号発振器Oが直列に接続されていると共
に、このPB信号発振器Oの両端には押ボタンダ
イヤルPの共通接点Pcを介して低抵抗回路1が
並列に接続されており、該低抵抗回路1の抵抗値
は押ボタンダイヤルPの共通接点Pcの三点接触
時にPB信号発振器Oにおける両端電圧の異常発
振を除去できる値に設定されている。また、この
低抵抗回路1には必要に応じて抵抗2が挿入され
ている。さらに、上記共通接点Pcの他端はコイ
ルLと送話器Tとの間に接続されており、共通接
点Pcが押動操作されるとPB信号発振器Oに流れ
る電流はツエナーダイオードZDを介さずに直接
PB信号発振器Oに加えられる構成とされている。 That is, the transmitter T and the Zener diode ZD
and a PB signal oscillator O are connected in series, and a low resistance circuit 1 is connected in parallel to both ends of this PB signal oscillator O via a common contact Pc of a push button dial P. The resistance value 1 is set to a value that can eliminate abnormal oscillation of the voltage across the PB signal oscillator O when the three points of the common contact Pc of the pushbutton dial P are contacted. Further, a resistor 2 is inserted into this low resistance circuit 1 as necessary. Furthermore, the other end of the common contact Pc is connected between the coil L and the transmitter T, and when the common contact Pc is pressed, the current flows to the PB signal oscillator O without passing through the Zener diode ZD. directly to
It is configured to be added to the PB signal oscillator O.
次に、以上説明した構成による回路の動作を説
明する。 Next, the operation of the circuit configured as described above will be explained.
まず発信者が送受話器を電話機本体のフツクス
イツチHSから外して貨幣を投入すると、
端子L1(+)→フツクスイツチHS→ダイオー
ドD1→接点CCL→ダイオードD6→コイルL→送
話器T→接点m3→ダイオードD3→端子L2(−)
の回路で硬貨投入ループが形成され、このループ
で発信が可能となる。ここで押ボタンダイヤルP
を操作すると共通接点Pcが閉じられてPB信号発
振器Oに電流が流れ、PB信号が発生する。この
押ボタンダイヤルPの操作の途中で共通接点Pc
が三点接触する時間tsが存在するが、この三点接
触の状態はPB信号発振器Oに対して低抵抗回路
1が並列に接続されることであり、該PB信号発
振器Oの両端は略短絡された形となる。従つて、
第5図に示すようにPB信号発振器Oの発振は確
実に停止された状態となつている。 First, when the caller removes the handset from the hook switch HS on the phone and inserts money, terminal L 1 (+) → hook switch HS → diode D 1 → contact CCL → diode D 6 → coil L → transmitter T → contact A coin input loop is formed in the circuit of m 3 → diode D 3 → terminal L 2 (−), and transmission is possible through this loop. Here, press button dial P
When operated, the common contact Pc is closed, current flows to the PB signal oscillator O, and the PB signal is generated. During operation of this pushbutton dial P, the common contact Pc
There is a time ts when the three-point contact occurs, but this three-point contact state means that the low resistance circuit 1 is connected in parallel to the PB signal oscillator O, and both ends of the PB signal oscillator O are almost short-circuited. It becomes a shape. Therefore,
As shown in FIG. 5, the oscillation of the PB signal oscillator O is definitely stopped.
また、駆動電流補償用コンデンサC1にはツエ
ナーダイオードZDの高抵抗により充分な充電電
圧が加えられており、第3図に示すような転極パ
ルス信号による切断時間tcにおいてもPB信号発
振器Oは上記コンデンサC1による電流供給によ
り安定したPB信号を発生することができる。 In addition, a sufficient charging voltage is applied to the drive current compensation capacitor C 1 due to the high resistance of the Zener diode ZD, and the PB signal oscillator O is maintained even during the disconnection time tc by the polarity reversal pulse signal as shown in Fig. 3. A stable PB signal can be generated by supplying current through the capacitor C1 .
なお、本考案は上述した実施例に限定されるも
のではなく、要旨を変更しない範囲で種々の変更
を行うことができる。 Note that the present invention is not limited to the embodiments described above, and various changes can be made without changing the gist.
以上説明したように本考案によれば、押ボタン
ダイヤルの共通接点が三点接触した際に、PB信
号発振器と並列に低抵抗回路が形成される構成と
したので、押ボタン操作時にPB信号発振器に中
途半端な電圧が加わるおそれがなく、PB信号発
振器の異常発振が防止される効果がある。 As explained above, according to the present invention, when the common contacts of the pushbutton dial make three-point contact, a low resistance circuit is formed in parallel with the PB signal oscillator, so when the pushbutton is operated, the PB signal oscillator There is no risk that an unreliable voltage will be applied to the PB signal oscillator, which has the effect of preventing abnormal oscillation of the PB signal oscillator.
第1図は従来の押ボタンダイヤル通話機の主要
部を示す回路図、第2図は本考案に係る回路を有
する公衆電話機回路の一実施例を示す主要部の回
路図、第3図は一般に貨幣収納信号として用いら
れている転極パルス信号の波形図、第4図は従来
の回路の発振波形を説明する波形説明図、第5図
は本考案に係る回路の発振波形を説明する波形説
明図である。
O……押ボタンダイヤル発振器、C1……駆動
電流を補償するためのコンデンサ、P……押ボタ
ンダイヤル、Pc……共通接点、1……低抵抗回
路。
Fig. 1 is a circuit diagram showing the main parts of a conventional push-button dial telephone, Fig. 2 is a circuit diagram of the main parts showing an embodiment of a public telephone circuit having a circuit according to the present invention, and Fig. A waveform diagram of a polarity inversion pulse signal used as a coin storage signal, FIG. 4 is a waveform explanation diagram explaining the oscillation waveform of a conventional circuit, and FIG. 5 is a waveform explanation explaining the oscillation waveform of the circuit according to the present invention. It is a diagram. O...Pushbutton dial oscillator, C1 ...Capacitor for compensating drive current, P...Pushbutton dial, Pc...Common contact, 1...Low resistance circuit.
Claims (1)
イヤル発振器の駆動電流を補償するためのコンデ
ンサを備え、送話器とツエナーダイオードと押ボ
タンダイヤル発振器とが直列に接続された押ボタ
ンダイヤル電話機回路における押ボタンダイヤル
発振器の異常発振防止回路であつて、押ボタンダ
イヤルの共通接点を介して前記押ボタンダイヤル
発振器の両端には、前記共通接点の三点接触時に
前記押ボタンダイヤル発振器における両端電圧の
異常発振を除去するべく抵抗値の設定された低抵
抗回路が並列に接続されていることを特徴とする
押ボタンダイヤルの異常発振防止回路。 A pushbutton in a pushbutton dial telephone circuit in which a transmitter, a Zener diode, and a pushbutton dial oscillator are connected in series, and is equipped with a capacitor for compensating the drive current of the pushbutton dial oscillator during the disconnection time of the polarization pulse signal. The abnormal oscillation prevention circuit for the dial oscillator is connected to both ends of the push button dial oscillator via a common contact of the push button dial, and prevents abnormal oscillation of the voltage at both ends of the push button dial oscillator when three points of the common contact are contacted. An abnormal oscillation prevention circuit for a pushbutton dial, characterized in that a low resistance circuit whose resistance value is set to eliminate the abnormal oscillation is connected in parallel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10319280U JPH0132440Y2 (en) | 1980-07-23 | 1980-07-23 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10319280U JPH0132440Y2 (en) | 1980-07-23 | 1980-07-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5728543U JPS5728543U (en) | 1982-02-15 |
JPH0132440Y2 true JPH0132440Y2 (en) | 1989-10-04 |
Family
ID=29464585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10319280U Expired JPH0132440Y2 (en) | 1980-07-23 | 1980-07-23 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0132440Y2 (en) |
-
1980
- 1980-07-23 JP JP10319280U patent/JPH0132440Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5728543U (en) | 1982-02-15 |
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